/*
 * ATTENTION: The "eval" devtool has been used (maybe by default in mode: "development").
 * This devtool is neither made for production nor for readable output files.
 * It uses "eval()" calls to create a separate source file in the browser devtools.
 * If you are trying to read the output file, select a different devtool (https://webpack.js.org/configuration/devtool/)
 * or disable the default devtool with "devtool: false".
 * If you are looking for production-ready output files, see mode: "production" (https://webpack.js.org/configuration/mode/).
 */
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/***/ "../node_modules/codemirror/lib/codemirror.js":
/*!****************************************************!*\
  !*** ../node_modules/codemirror/lib/codemirror.js ***!
  \****************************************************/
/***/ (function(module) {

eval("// CodeMirror, copyright (c) by Marijn Haverbeke and others\n// Distributed under an MIT license: https://codemirror.net/LICENSE\n\n// This is CodeMirror (https://codemirror.net), a code editor\n// implemented in JavaScript on top of the browser's DOM.\n//\n// You can find some technical background for some of the code below\n// at http://marijnhaverbeke.nl/blog/#cm-internals .\n\n(function (global, factory) {\n   true ? module.exports = factory() :\n  0;\n}(this, (function () { 'use strict';\n\n  // Kludges for bugs and behavior differences that can't be feature\n  // detected are enabled based on userAgent etc sniffing.\n  var userAgent = navigator.userAgent;\n  var platform = navigator.platform;\n\n  var gecko = /gecko\\/\\d/i.test(userAgent);\n  var ie_upto10 = /MSIE \\d/.test(userAgent);\n  var ie_11up = /Trident\\/(?:[7-9]|\\d{2,})\\..*rv:(\\d+)/.exec(userAgent);\n  var edge = /Edge\\/(\\d+)/.exec(userAgent);\n  var ie = ie_upto10 || ie_11up || edge;\n  var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : +(edge || ie_11up)[1]);\n  var webkit = !edge && /WebKit\\//.test(userAgent);\n  var qtwebkit = webkit && /Qt\\/\\d+\\.\\d+/.test(userAgent);\n  var chrome = !edge && /Chrome\\//.test(userAgent);\n  var presto = /Opera\\//.test(userAgent);\n  var safari = /Apple Computer/.test(navigator.vendor);\n  var mac_geMountainLion = /Mac OS X 1\\d\\D([8-9]|\\d\\d)\\D/.test(userAgent);\n  var phantom = /PhantomJS/.test(userAgent);\n\n  var ios = safari && (/Mobile\\/\\w+/.test(userAgent) || navigator.maxTouchPoints > 2);\n  var android = /Android/.test(userAgent);\n  // This is woefully incomplete. Suggestions for alternative methods welcome.\n  var mobile = ios || android || /webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent);\n  var mac = ios || /Mac/.test(platform);\n  var chromeOS = /\\bCrOS\\b/.test(userAgent);\n  var windows = /win/i.test(platform);\n\n  var presto_version = presto && userAgent.match(/Version\\/(\\d*\\.\\d*)/);\n  if (presto_version) { presto_version = Number(presto_version[1]); }\n  if (presto_version && presto_version >= 15) { presto = false; webkit = true; }\n  // Some browsers use the wrong event properties to signal cmd/ctrl on OS X\n  var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11));\n  var captureRightClick = gecko || (ie && ie_version >= 9);\n\n  function classTest(cls) { return new RegExp(\"(^|\\\\s)\" + cls + \"(?:$|\\\\s)\\\\s*\") }\n\n  var rmClass = function(node, cls) {\n    var current = node.className;\n    var match = classTest(cls).exec(current);\n    if (match) {\n      var after = current.slice(match.index + match[0].length);\n      node.className = current.slice(0, match.index) + (after ? match[1] + after : \"\");\n    }\n  };\n\n  function removeChildren(e) {\n    for (var count = e.childNodes.length; count > 0; --count)\n      { e.removeChild(e.firstChild); }\n    return e\n  }\n\n  function removeChildrenAndAdd(parent, e) {\n    return removeChildren(parent).appendChild(e)\n  }\n\n  function elt(tag, content, className, style) {\n    var e = document.createElement(tag);\n    if (className) { e.className = className; }\n    if (style) { e.style.cssText = style; }\n    if (typeof content == \"string\") { e.appendChild(document.createTextNode(content)); }\n    else if (content) { for (var i = 0; i < content.length; ++i) { e.appendChild(content[i]); } }\n    return e\n  }\n  // wrapper for elt, which removes the elt from the accessibility tree\n  function eltP(tag, content, className, style) {\n    var e = elt(tag, content, className, style);\n    e.setAttribute(\"role\", \"presentation\");\n    return e\n  }\n\n  var range;\n  if (document.createRange) { range = function(node, start, end, endNode) {\n    var r = document.createRange();\n    r.setEnd(endNode || node, end);\n    r.setStart(node, start);\n    return r\n  }; }\n  else { range = function(node, start, end) {\n    var r = document.body.createTextRange();\n    try { r.moveToElementText(node.parentNode); }\n    catch(e) { return r }\n    r.collapse(true);\n    r.moveEnd(\"character\", end);\n    r.moveStart(\"character\", start);\n    return r\n  }; }\n\n  function contains(parent, child) {\n    if (child.nodeType == 3) // Android browser always returns false when child is a textnode\n      { child = child.parentNode; }\n    if (parent.contains)\n      { return parent.contains(child) }\n    do {\n      if (child.nodeType == 11) { child = child.host; }\n      if (child == parent) { return true }\n    } while (child = child.parentNode)\n  }\n\n  function activeElt() {\n    // IE and Edge may throw an \"Unspecified Error\" when accessing document.activeElement.\n    // IE < 10 will throw when accessed while the page is loading or in an iframe.\n    // IE > 9 and Edge will throw when accessed in an iframe if document.body is unavailable.\n    var activeElement;\n    try {\n      activeElement = document.activeElement;\n    } catch(e) {\n      activeElement = document.body || null;\n    }\n    while (activeElement && activeElement.shadowRoot && activeElement.shadowRoot.activeElement)\n      { activeElement = activeElement.shadowRoot.activeElement; }\n    return activeElement\n  }\n\n  function addClass(node, cls) {\n    var current = node.className;\n    if (!classTest(cls).test(current)) { node.className += (current ? \" \" : \"\") + cls; }\n  }\n  function joinClasses(a, b) {\n    var as = a.split(\" \");\n    for (var i = 0; i < as.length; i++)\n      { if (as[i] && !classTest(as[i]).test(b)) { b += \" \" + as[i]; } }\n    return b\n  }\n\n  var selectInput = function(node) { node.select(); };\n  if (ios) // Mobile Safari apparently has a bug where select() is broken.\n    { selectInput = function(node) { node.selectionStart = 0; node.selectionEnd = node.value.length; }; }\n  else if (ie) // Suppress mysterious IE10 errors\n    { selectInput = function(node) { try { node.select(); } catch(_e) {} }; }\n\n  function bind(f) {\n    var args = Array.prototype.slice.call(arguments, 1);\n    return function(){return f.apply(null, args)}\n  }\n\n  function copyObj(obj, target, overwrite) {\n    if (!target) { target = {}; }\n    for (var prop in obj)\n      { if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop)))\n        { target[prop] = obj[prop]; } }\n    return target\n  }\n\n  // Counts the column offset in a string, taking tabs into account.\n  // Used mostly to find indentation.\n  function countColumn(string, end, tabSize, startIndex, startValue) {\n    if (end == null) {\n      end = string.search(/[^\\s\\u00a0]/);\n      if (end == -1) { end = string.length; }\n    }\n    for (var i = startIndex || 0, n = startValue || 0;;) {\n      var nextTab = string.indexOf(\"\\t\", i);\n      if (nextTab < 0 || nextTab >= end)\n        { return n + (end - i) }\n      n += nextTab - i;\n      n += tabSize - (n % tabSize);\n      i = nextTab + 1;\n    }\n  }\n\n  var Delayed = function() {\n    this.id = null;\n    this.f = null;\n    this.time = 0;\n    this.handler = bind(this.onTimeout, this);\n  };\n  Delayed.prototype.onTimeout = function (self) {\n    self.id = 0;\n    if (self.time <= +new Date) {\n      self.f();\n    } else {\n      setTimeout(self.handler, self.time - +new Date);\n    }\n  };\n  Delayed.prototype.set = function (ms, f) {\n    this.f = f;\n    var time = +new Date + ms;\n    if (!this.id || time < this.time) {\n      clearTimeout(this.id);\n      this.id = setTimeout(this.handler, ms);\n      this.time = time;\n    }\n  };\n\n  function indexOf(array, elt) {\n    for (var i = 0; i < array.length; ++i)\n      { if (array[i] == elt) { return i } }\n    return -1\n  }\n\n  // Number of pixels added to scroller and sizer to hide scrollbar\n  var scrollerGap = 50;\n\n  // Returned or thrown by various protocols to signal 'I'm not\n  // handling this'.\n  var Pass = {toString: function(){return \"CodeMirror.Pass\"}};\n\n  // Reused option objects for setSelection & friends\n  var sel_dontScroll = {scroll: false}, sel_mouse = {origin: \"*mouse\"}, sel_move = {origin: \"+move\"};\n\n  // The inverse of countColumn -- find the offset that corresponds to\n  // a particular column.\n  function findColumn(string, goal, tabSize) {\n    for (var pos = 0, col = 0;;) {\n      var nextTab = string.indexOf(\"\\t\", pos);\n      if (nextTab == -1) { nextTab = string.length; }\n      var skipped = nextTab - pos;\n      if (nextTab == string.length || col + skipped >= goal)\n        { return pos + Math.min(skipped, goal - col) }\n      col += nextTab - pos;\n      col += tabSize - (col % tabSize);\n      pos = nextTab + 1;\n      if (col >= goal) { return pos }\n    }\n  }\n\n  var spaceStrs = [\"\"];\n  function spaceStr(n) {\n    while (spaceStrs.length <= n)\n      { spaceStrs.push(lst(spaceStrs) + \" \"); }\n    return spaceStrs[n]\n  }\n\n  function lst(arr) { return arr[arr.length-1] }\n\n  function map(array, f) {\n    var out = [];\n    for (var i = 0; i < array.length; i++) { out[i] = f(array[i], i); }\n    return out\n  }\n\n  function insertSorted(array, value, score) {\n    var pos = 0, priority = score(value);\n    while (pos < array.length && score(array[pos]) <= priority) { pos++; }\n    array.splice(pos, 0, value);\n  }\n\n  function nothing() {}\n\n  function createObj(base, props) {\n    var inst;\n    if (Object.create) {\n      inst = Object.create(base);\n    } else {\n      nothing.prototype = base;\n      inst = new nothing();\n    }\n    if (props) { copyObj(props, inst); }\n    return inst\n  }\n\n  var nonASCIISingleCaseWordChar = /[\\u00df\\u0587\\u0590-\\u05f4\\u0600-\\u06ff\\u3040-\\u309f\\u30a0-\\u30ff\\u3400-\\u4db5\\u4e00-\\u9fcc\\uac00-\\ud7af]/;\n  function isWordCharBasic(ch) {\n    return /\\w/.test(ch) || ch > \"\\x80\" &&\n      (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch))\n  }\n  function isWordChar(ch, helper) {\n    if (!helper) { return isWordCharBasic(ch) }\n    if (helper.source.indexOf(\"\\\\w\") > -1 && isWordCharBasic(ch)) { return true }\n    return helper.test(ch)\n  }\n\n  function isEmpty(obj) {\n    for (var n in obj) { if (obj.hasOwnProperty(n) && obj[n]) { return false } }\n    return true\n  }\n\n  // Extending unicode characters. A series of a non-extending char +\n  // any number of extending chars is treated as a single unit as far\n  // as editing and measuring is concerned. This is not fully correct,\n  // since some scripts/fonts/browsers also treat other configurations\n  // of code points as a group.\n  var extendingChars = /[\\u0300-\\u036f\\u0483-\\u0489\\u0591-\\u05bd\\u05bf\\u05c1\\u05c2\\u05c4\\u05c5\\u05c7\\u0610-\\u061a\\u064b-\\u065e\\u0670\\u06d6-\\u06dc\\u06de-\\u06e4\\u06e7\\u06e8\\u06ea-\\u06ed\\u0711\\u0730-\\u074a\\u07a6-\\u07b0\\u07eb-\\u07f3\\u0816-\\u0819\\u081b-\\u0823\\u0825-\\u0827\\u0829-\\u082d\\u0900-\\u0902\\u093c\\u0941-\\u0948\\u094d\\u0951-\\u0955\\u0962\\u0963\\u0981\\u09bc\\u09be\\u09c1-\\u09c4\\u09cd\\u09d7\\u09e2\\u09e3\\u0a01\\u0a02\\u0a3c\\u0a41\\u0a42\\u0a47\\u0a48\\u0a4b-\\u0a4d\\u0a51\\u0a70\\u0a71\\u0a75\\u0a81\\u0a82\\u0abc\\u0ac1-\\u0ac5\\u0ac7\\u0ac8\\u0acd\\u0ae2\\u0ae3\\u0b01\\u0b3c\\u0b3e\\u0b3f\\u0b41-\\u0b44\\u0b4d\\u0b56\\u0b57\\u0b62\\u0b63\\u0b82\\u0bbe\\u0bc0\\u0bcd\\u0bd7\\u0c3e-\\u0c40\\u0c46-\\u0c48\\u0c4a-\\u0c4d\\u0c55\\u0c56\\u0c62\\u0c63\\u0cbc\\u0cbf\\u0cc2\\u0cc6\\u0ccc\\u0ccd\\u0cd5\\u0cd6\\u0ce2\\u0ce3\\u0d3e\\u0d41-\\u0d44\\u0d4d\\u0d57\\u0d62\\u0d63\\u0dca\\u0dcf\\u0dd2-\\u0dd4\\u0dd6\\u0ddf\\u0e31\\u0e34-\\u0e3a\\u0e47-\\u0e4e\\u0eb1\\u0eb4-\\u0eb9\\u0ebb\\u0ebc\\u0ec8-\\u0ecd\\u0f18\\u0f19\\u0f35\\u0f37\\u0f39\\u0f71-\\u0f7e\\u0f80-\\u0f84\\u0f86\\u0f87\\u0f90-\\u0f97\\u0f99-\\u0fbc\\u0fc6\\u102d-\\u1030\\u1032-\\u1037\\u1039\\u103a\\u103d\\u103e\\u1058\\u1059\\u105e-\\u1060\\u1071-\\u1074\\u1082\\u1085\\u1086\\u108d\\u109d\\u135f\\u1712-\\u1714\\u1732-\\u1734\\u1752\\u1753\\u1772\\u1773\\u17b7-\\u17bd\\u17c6\\u17c9-\\u17d3\\u17dd\\u180b-\\u180d\\u18a9\\u1920-\\u1922\\u1927\\u1928\\u1932\\u1939-\\u193b\\u1a17\\u1a18\\u1a56\\u1a58-\\u1a5e\\u1a60\\u1a62\\u1a65-\\u1a6c\\u1a73-\\u1a7c\\u1a7f\\u1b00-\\u1b03\\u1b34\\u1b36-\\u1b3a\\u1b3c\\u1b42\\u1b6b-\\u1b73\\u1b80\\u1b81\\u1ba2-\\u1ba5\\u1ba8\\u1ba9\\u1c2c-\\u1c33\\u1c36\\u1c37\\u1cd0-\\u1cd2\\u1cd4-\\u1ce0\\u1ce2-\\u1ce8\\u1ced\\u1dc0-\\u1de6\\u1dfd-\\u1dff\\u200c\\u200d\\u20d0-\\u20f0\\u2cef-\\u2cf1\\u2de0-\\u2dff\\u302a-\\u302f\\u3099\\u309a\\ua66f-\\ua672\\ua67c\\ua67d\\ua6f0\\ua6f1\\ua802\\ua806\\ua80b\\ua825\\ua826\\ua8c4\\ua8e0-\\ua8f1\\ua926-\\ua92d\\ua947-\\ua951\\ua980-\\ua982\\ua9b3\\ua9b6-\\ua9b9\\ua9bc\\uaa29-\\uaa2e\\uaa31\\uaa32\\uaa35\\uaa36\\uaa43\\uaa4c\\uaab0\\uaab2-\\uaab4\\uaab7\\uaab8\\uaabe\\uaabf\\uaac1\\uabe5\\uabe8\\uabed\\udc00-\\udfff\\ufb1e\\ufe00-\\ufe0f\\ufe20-\\ufe26\\uff9e\\uff9f]/;\n  function isExtendingChar(ch) { return ch.charCodeAt(0) >= 768 && extendingChars.test(ch) }\n\n  // Returns a number from the range [`0`; `str.length`] unless `pos` is outside that range.\n  function skipExtendingChars(str, pos, dir) {\n    while ((dir < 0 ? pos > 0 : pos < str.length) && isExtendingChar(str.charAt(pos))) { pos += dir; }\n    return pos\n  }\n\n  // Returns the value from the range [`from`; `to`] that satisfies\n  // `pred` and is closest to `from`. Assumes that at least `to`\n  // satisfies `pred`. Supports `from` being greater than `to`.\n  function findFirst(pred, from, to) {\n    // At any point we are certain `to` satisfies `pred`, don't know\n    // whether `from` does.\n    var dir = from > to ? -1 : 1;\n    for (;;) {\n      if (from == to) { return from }\n      var midF = (from + to) / 2, mid = dir < 0 ? Math.ceil(midF) : Math.floor(midF);\n      if (mid == from) { return pred(mid) ? from : to }\n      if (pred(mid)) { to = mid; }\n      else { from = mid + dir; }\n    }\n  }\n\n  // BIDI HELPERS\n\n  function iterateBidiSections(order, from, to, f) {\n    if (!order) { return f(from, to, \"ltr\", 0) }\n    var found = false;\n    for (var i = 0; i < order.length; ++i) {\n      var part = order[i];\n      if (part.from < to && part.to > from || from == to && part.to == from) {\n        f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? \"rtl\" : \"ltr\", i);\n        found = true;\n      }\n    }\n    if (!found) { f(from, to, \"ltr\"); }\n  }\n\n  var bidiOther = null;\n  function getBidiPartAt(order, ch, sticky) {\n    var found;\n    bidiOther = null;\n    for (var i = 0; i < order.length; ++i) {\n      var cur = order[i];\n      if (cur.from < ch && cur.to > ch) { return i }\n      if (cur.to == ch) {\n        if (cur.from != cur.to && sticky == \"before\") { found = i; }\n        else { bidiOther = i; }\n      }\n      if (cur.from == ch) {\n        if (cur.from != cur.to && sticky != \"before\") { found = i; }\n        else { bidiOther = i; }\n      }\n    }\n    return found != null ? found : bidiOther\n  }\n\n  // Bidirectional ordering algorithm\n  // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm\n  // that this (partially) implements.\n\n  // One-char codes used for character types:\n  // L (L):   Left-to-Right\n  // R (R):   Right-to-Left\n  // r (AL):  Right-to-Left Arabic\n  // 1 (EN):  European Number\n  // + (ES):  European Number Separator\n  // % (ET):  European Number Terminator\n  // n (AN):  Arabic Number\n  // , (CS):  Common Number Separator\n  // m (NSM): Non-Spacing Mark\n  // b (BN):  Boundary Neutral\n  // s (B):   Paragraph Separator\n  // t (S):   Segment Separator\n  // w (WS):  Whitespace\n  // N (ON):  Other Neutrals\n\n  // Returns null if characters are ordered as they appear\n  // (left-to-right), or an array of sections ({from, to, level}\n  // objects) in the order in which they occur visually.\n  var bidiOrdering = (function() {\n    // Character types for codepoints 0 to 0xff\n    var lowTypes = \"bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN\";\n    // Character types for codepoints 0x600 to 0x6f9\n    var arabicTypes = \"nnnnnnNNr%%r,rNNmmmmmmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmmmnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmnNmmmmmmrrmmNmmmmrr1111111111\";\n    function charType(code) {\n      if (code <= 0xf7) { return lowTypes.charAt(code) }\n      else if (0x590 <= code && code <= 0x5f4) { return \"R\" }\n      else if (0x600 <= code && code <= 0x6f9) { return arabicTypes.charAt(code - 0x600) }\n      else if (0x6ee <= code && code <= 0x8ac) { return \"r\" }\n      else if (0x2000 <= code && code <= 0x200b) { return \"w\" }\n      else if (code == 0x200c) { return \"b\" }\n      else { return \"L\" }\n    }\n\n    var bidiRE = /[\\u0590-\\u05f4\\u0600-\\u06ff\\u0700-\\u08ac]/;\n    var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/;\n\n    function BidiSpan(level, from, to) {\n      this.level = level;\n      this.from = from; this.to = to;\n    }\n\n    return function(str, direction) {\n      var outerType = direction == \"ltr\" ? \"L\" : \"R\";\n\n      if (str.length == 0 || direction == \"ltr\" && !bidiRE.test(str)) { return false }\n      var len = str.length, types = [];\n      for (var i = 0; i < len; ++i)\n        { types.push(charType(str.charCodeAt(i))); }\n\n      // W1. Examine each non-spacing mark (NSM) in the level run, and\n      // change the type of the NSM to the type of the previous\n      // character. If the NSM is at the start of the level run, it will\n      // get the type of sor.\n      for (var i$1 = 0, prev = outerType; i$1 < len; ++i$1) {\n        var type = types[i$1];\n        if (type == \"m\") { types[i$1] = prev; }\n        else { prev = type; }\n      }\n\n      // W2. Search backwards from each instance of a European number\n      // until the first strong type (R, L, AL, or sor) is found. If an\n      // AL is found, change the type of the European number to Arabic\n      // number.\n      // W3. Change all ALs to R.\n      for (var i$2 = 0, cur = outerType; i$2 < len; ++i$2) {\n        var type$1 = types[i$2];\n        if (type$1 == \"1\" && cur == \"r\") { types[i$2] = \"n\"; }\n        else if (isStrong.test(type$1)) { cur = type$1; if (type$1 == \"r\") { types[i$2] = \"R\"; } }\n      }\n\n      // W4. A single European separator between two European numbers\n      // changes to a European number. A single common separator between\n      // two numbers of the same type changes to that type.\n      for (var i$3 = 1, prev$1 = types[0]; i$3 < len - 1; ++i$3) {\n        var type$2 = types[i$3];\n        if (type$2 == \"+\" && prev$1 == \"1\" && types[i$3+1] == \"1\") { types[i$3] = \"1\"; }\n        else if (type$2 == \",\" && prev$1 == types[i$3+1] &&\n                 (prev$1 == \"1\" || prev$1 == \"n\")) { types[i$3] = prev$1; }\n        prev$1 = type$2;\n      }\n\n      // W5. A sequence of European terminators adjacent to European\n      // numbers changes to all European numbers.\n      // W6. Otherwise, separators and terminators change to Other\n      // Neutral.\n      for (var i$4 = 0; i$4 < len; ++i$4) {\n        var type$3 = types[i$4];\n        if (type$3 == \",\") { types[i$4] = \"N\"; }\n        else if (type$3 == \"%\") {\n          var end = (void 0);\n          for (end = i$4 + 1; end < len && types[end] == \"%\"; ++end) {}\n          var replace = (i$4 && types[i$4-1] == \"!\") || (end < len && types[end] == \"1\") ? \"1\" : \"N\";\n          for (var j = i$4; j < end; ++j) { types[j] = replace; }\n          i$4 = end - 1;\n        }\n      }\n\n      // W7. Search backwards from each instance of a European number\n      // until the first strong type (R, L, or sor) is found. If an L is\n      // found, then change the type of the European number to L.\n      for (var i$5 = 0, cur$1 = outerType; i$5 < len; ++i$5) {\n        var type$4 = types[i$5];\n        if (cur$1 == \"L\" && type$4 == \"1\") { types[i$5] = \"L\"; }\n        else if (isStrong.test(type$4)) { cur$1 = type$4; }\n      }\n\n      // N1. A sequence of neutrals takes the direction of the\n      // surrounding strong text if the text on both sides has the same\n      // direction. European and Arabic numbers act as if they were R in\n      // terms of their influence on neutrals. Start-of-level-run (sor)\n      // and end-of-level-run (eor) are used at level run boundaries.\n      // N2. Any remaining neutrals take the embedding direction.\n      for (var i$6 = 0; i$6 < len; ++i$6) {\n        if (isNeutral.test(types[i$6])) {\n          var end$1 = (void 0);\n          for (end$1 = i$6 + 1; end$1 < len && isNeutral.test(types[end$1]); ++end$1) {}\n          var before = (i$6 ? types[i$6-1] : outerType) == \"L\";\n          var after = (end$1 < len ? types[end$1] : outerType) == \"L\";\n          var replace$1 = before == after ? (before ? \"L\" : \"R\") : outerType;\n          for (var j$1 = i$6; j$1 < end$1; ++j$1) { types[j$1] = replace$1; }\n          i$6 = end$1 - 1;\n        }\n      }\n\n      // Here we depart from the documented algorithm, in order to avoid\n      // building up an actual levels array. Since there are only three\n      // levels (0, 1, 2) in an implementation that doesn't take\n      // explicit embedding into account, we can build up the order on\n      // the fly, without following the level-based algorithm.\n      var order = [], m;\n      for (var i$7 = 0; i$7 < len;) {\n        if (countsAsLeft.test(types[i$7])) {\n          var start = i$7;\n          for (++i$7; i$7 < len && countsAsLeft.test(types[i$7]); ++i$7) {}\n          order.push(new BidiSpan(0, start, i$7));\n        } else {\n          var pos = i$7, at = order.length, isRTL = direction == \"rtl\" ? 1 : 0;\n          for (++i$7; i$7 < len && types[i$7] != \"L\"; ++i$7) {}\n          for (var j$2 = pos; j$2 < i$7;) {\n            if (countsAsNum.test(types[j$2])) {\n              if (pos < j$2) { order.splice(at, 0, new BidiSpan(1, pos, j$2)); at += isRTL; }\n              var nstart = j$2;\n              for (++j$2; j$2 < i$7 && countsAsNum.test(types[j$2]); ++j$2) {}\n              order.splice(at, 0, new BidiSpan(2, nstart, j$2));\n              at += isRTL;\n              pos = j$2;\n            } else { ++j$2; }\n          }\n          if (pos < i$7) { order.splice(at, 0, new BidiSpan(1, pos, i$7)); }\n        }\n      }\n      if (direction == \"ltr\") {\n        if (order[0].level == 1 && (m = str.match(/^\\s+/))) {\n          order[0].from = m[0].length;\n          order.unshift(new BidiSpan(0, 0, m[0].length));\n        }\n        if (lst(order).level == 1 && (m = str.match(/\\s+$/))) {\n          lst(order).to -= m[0].length;\n          order.push(new BidiSpan(0, len - m[0].length, len));\n        }\n      }\n\n      return direction == \"rtl\" ? order.reverse() : order\n    }\n  })();\n\n  // Get the bidi ordering for the given line (and cache it). Returns\n  // false for lines that are fully left-to-right, and an array of\n  // BidiSpan objects otherwise.\n  function getOrder(line, direction) {\n    var order = line.order;\n    if (order == null) { order = line.order = bidiOrdering(line.text, direction); }\n    return order\n  }\n\n  // EVENT HANDLING\n\n  // Lightweight event framework. on/off also work on DOM nodes,\n  // registering native DOM handlers.\n\n  var noHandlers = [];\n\n  var on = function(emitter, type, f) {\n    if (emitter.addEventListener) {\n      emitter.addEventListener(type, f, false);\n    } else if (emitter.attachEvent) {\n      emitter.attachEvent(\"on\" + type, f);\n    } else {\n      var map = emitter._handlers || (emitter._handlers = {});\n      map[type] = (map[type] || noHandlers).concat(f);\n    }\n  };\n\n  function getHandlers(emitter, type) {\n    return emitter._handlers && emitter._handlers[type] || noHandlers\n  }\n\n  function off(emitter, type, f) {\n    if (emitter.removeEventListener) {\n      emitter.removeEventListener(type, f, false);\n    } else if (emitter.detachEvent) {\n      emitter.detachEvent(\"on\" + type, f);\n    } else {\n      var map = emitter._handlers, arr = map && map[type];\n      if (arr) {\n        var index = indexOf(arr, f);\n        if (index > -1)\n          { map[type] = arr.slice(0, index).concat(arr.slice(index + 1)); }\n      }\n    }\n  }\n\n  function signal(emitter, type /*, values...*/) {\n    var handlers = getHandlers(emitter, type);\n    if (!handlers.length) { return }\n    var args = Array.prototype.slice.call(arguments, 2);\n    for (var i = 0; i < handlers.length; ++i) { handlers[i].apply(null, args); }\n  }\n\n  // The DOM events that CodeMirror handles can be overridden by\n  // registering a (non-DOM) handler on the editor for the event name,\n  // and preventDefault-ing the event in that handler.\n  function signalDOMEvent(cm, e, override) {\n    if (typeof e == \"string\")\n      { e = {type: e, preventDefault: function() { this.defaultPrevented = true; }}; }\n    signal(cm, override || e.type, cm, e);\n    return e_defaultPrevented(e) || e.codemirrorIgnore\n  }\n\n  function signalCursorActivity(cm) {\n    var arr = cm._handlers && cm._handlers.cursorActivity;\n    if (!arr) { return }\n    var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = []);\n    for (var i = 0; i < arr.length; ++i) { if (indexOf(set, arr[i]) == -1)\n      { set.push(arr[i]); } }\n  }\n\n  function hasHandler(emitter, type) {\n    return getHandlers(emitter, type).length > 0\n  }\n\n  // Add on and off methods to a constructor's prototype, to make\n  // registering events on such objects more convenient.\n  function eventMixin(ctor) {\n    ctor.prototype.on = function(type, f) {on(this, type, f);};\n    ctor.prototype.off = function(type, f) {off(this, type, f);};\n  }\n\n  // Due to the fact that we still support jurassic IE versions, some\n  // compatibility wrappers are needed.\n\n  function e_preventDefault(e) {\n    if (e.preventDefault) { e.preventDefault(); }\n    else { e.returnValue = false; }\n  }\n  function e_stopPropagation(e) {\n    if (e.stopPropagation) { e.stopPropagation(); }\n    else { e.cancelBubble = true; }\n  }\n  function e_defaultPrevented(e) {\n    return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false\n  }\n  function e_stop(e) {e_preventDefault(e); e_stopPropagation(e);}\n\n  function e_target(e) {return e.target || e.srcElement}\n  function e_button(e) {\n    var b = e.which;\n    if (b == null) {\n      if (e.button & 1) { b = 1; }\n      else if (e.button & 2) { b = 3; }\n      else if (e.button & 4) { b = 2; }\n    }\n    if (mac && e.ctrlKey && b == 1) { b = 3; }\n    return b\n  }\n\n  // Detect drag-and-drop\n  var dragAndDrop = function() {\n    // There is *some* kind of drag-and-drop support in IE6-8, but I\n    // couldn't get it to work yet.\n    if (ie && ie_version < 9) { return false }\n    var div = elt('div');\n    return \"draggable\" in div || \"dragDrop\" in div\n  }();\n\n  var zwspSupported;\n  function zeroWidthElement(measure) {\n    if (zwspSupported == null) {\n      var test = elt(\"span\", \"\\u200b\");\n      removeChildrenAndAdd(measure, elt(\"span\", [test, document.createTextNode(\"x\")]));\n      if (measure.firstChild.offsetHeight != 0)\n        { zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8); }\n    }\n    var node = zwspSupported ? elt(\"span\", \"\\u200b\") :\n      elt(\"span\", \"\\u00a0\", null, \"display: inline-block; width: 1px; margin-right: -1px\");\n    node.setAttribute(\"cm-text\", \"\");\n    return node\n  }\n\n  // Feature-detect IE's crummy client rect reporting for bidi text\n  var badBidiRects;\n  function hasBadBidiRects(measure) {\n    if (badBidiRects != null) { return badBidiRects }\n    var txt = removeChildrenAndAdd(measure, document.createTextNode(\"A\\u062eA\"));\n    var r0 = range(txt, 0, 1).getBoundingClientRect();\n    var r1 = range(txt, 1, 2).getBoundingClientRect();\n    removeChildren(measure);\n    if (!r0 || r0.left == r0.right) { return false } // Safari returns null in some cases (#2780)\n    return badBidiRects = (r1.right - r0.right < 3)\n  }\n\n  // See if \"\".split is the broken IE version, if so, provide an\n  // alternative way to split lines.\n  var splitLinesAuto = \"\\n\\nb\".split(/\\n/).length != 3 ? function (string) {\n    var pos = 0, result = [], l = string.length;\n    while (pos <= l) {\n      var nl = string.indexOf(\"\\n\", pos);\n      if (nl == -1) { nl = string.length; }\n      var line = string.slice(pos, string.charAt(nl - 1) == \"\\r\" ? nl - 1 : nl);\n      var rt = line.indexOf(\"\\r\");\n      if (rt != -1) {\n        result.push(line.slice(0, rt));\n        pos += rt + 1;\n      } else {\n        result.push(line);\n        pos = nl + 1;\n      }\n    }\n    return result\n  } : function (string) { return string.split(/\\r\\n?|\\n/); };\n\n  var hasSelection = window.getSelection ? function (te) {\n    try { return te.selectionStart != te.selectionEnd }\n    catch(e) { return false }\n  } : function (te) {\n    var range;\n    try {range = te.ownerDocument.selection.createRange();}\n    catch(e) {}\n    if (!range || range.parentElement() != te) { return false }\n    return range.compareEndPoints(\"StartToEnd\", range) != 0\n  };\n\n  var hasCopyEvent = (function () {\n    var e = elt(\"div\");\n    if (\"oncopy\" in e) { return true }\n    e.setAttribute(\"oncopy\", \"return;\");\n    return typeof e.oncopy == \"function\"\n  })();\n\n  var badZoomedRects = null;\n  function hasBadZoomedRects(measure) {\n    if (badZoomedRects != null) { return badZoomedRects }\n    var node = removeChildrenAndAdd(measure, elt(\"span\", \"x\"));\n    var normal = node.getBoundingClientRect();\n    var fromRange = range(node, 0, 1).getBoundingClientRect();\n    return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1\n  }\n\n  // Known modes, by name and by MIME\n  var modes = {}, mimeModes = {};\n\n  // Extra arguments are stored as the mode's dependencies, which is\n  // used by (legacy) mechanisms like loadmode.js to automatically\n  // load a mode. (Preferred mechanism is the require/define calls.)\n  function defineMode(name, mode) {\n    if (arguments.length > 2)\n      { mode.dependencies = Array.prototype.slice.call(arguments, 2); }\n    modes[name] = mode;\n  }\n\n  function defineMIME(mime, spec) {\n    mimeModes[mime] = spec;\n  }\n\n  // Given a MIME type, a {name, ...options} config object, or a name\n  // string, return a mode config object.\n  function resolveMode(spec) {\n    if (typeof spec == \"string\" && mimeModes.hasOwnProperty(spec)) {\n      spec = mimeModes[spec];\n    } else if (spec && typeof spec.name == \"string\" && mimeModes.hasOwnProperty(spec.name)) {\n      var found = mimeModes[spec.name];\n      if (typeof found == \"string\") { found = {name: found}; }\n      spec = createObj(found, spec);\n      spec.name = found.name;\n    } else if (typeof spec == \"string\" && /^[\\w\\-]+\\/[\\w\\-]+\\+xml$/.test(spec)) {\n      return resolveMode(\"application/xml\")\n    } else if (typeof spec == \"string\" && /^[\\w\\-]+\\/[\\w\\-]+\\+json$/.test(spec)) {\n      return resolveMode(\"application/json\")\n    }\n    if (typeof spec == \"string\") { return {name: spec} }\n    else { return spec || {name: \"null\"} }\n  }\n\n  // Given a mode spec (anything that resolveMode accepts), find and\n  // initialize an actual mode object.\n  function getMode(options, spec) {\n    spec = resolveMode(spec);\n    var mfactory = modes[spec.name];\n    if (!mfactory) { return getMode(options, \"text/plain\") }\n    var modeObj = mfactory(options, spec);\n    if (modeExtensions.hasOwnProperty(spec.name)) {\n      var exts = modeExtensions[spec.name];\n      for (var prop in exts) {\n        if (!exts.hasOwnProperty(prop)) { continue }\n        if (modeObj.hasOwnProperty(prop)) { modeObj[\"_\" + prop] = modeObj[prop]; }\n        modeObj[prop] = exts[prop];\n      }\n    }\n    modeObj.name = spec.name;\n    if (spec.helperType) { modeObj.helperType = spec.helperType; }\n    if (spec.modeProps) { for (var prop$1 in spec.modeProps)\n      { modeObj[prop$1] = spec.modeProps[prop$1]; } }\n\n    return modeObj\n  }\n\n  // This can be used to attach properties to mode objects from\n  // outside the actual mode definition.\n  var modeExtensions = {};\n  function extendMode(mode, properties) {\n    var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});\n    copyObj(properties, exts);\n  }\n\n  function copyState(mode, state) {\n    if (state === true) { return state }\n    if (mode.copyState) { return mode.copyState(state) }\n    var nstate = {};\n    for (var n in state) {\n      var val = state[n];\n      if (val instanceof Array) { val = val.concat([]); }\n      nstate[n] = val;\n    }\n    return nstate\n  }\n\n  // Given a mode and a state (for that mode), find the inner mode and\n  // state at the position that the state refers to.\n  function innerMode(mode, state) {\n    var info;\n    while (mode.innerMode) {\n      info = mode.innerMode(state);\n      if (!info || info.mode == mode) { break }\n      state = info.state;\n      mode = info.mode;\n    }\n    return info || {mode: mode, state: state}\n  }\n\n  function startState(mode, a1, a2) {\n    return mode.startState ? mode.startState(a1, a2) : true\n  }\n\n  // STRING STREAM\n\n  // Fed to the mode parsers, provides helper functions to make\n  // parsers more succinct.\n\n  var StringStream = function(string, tabSize, lineOracle) {\n    this.pos = this.start = 0;\n    this.string = string;\n    this.tabSize = tabSize || 8;\n    this.lastColumnPos = this.lastColumnValue = 0;\n    this.lineStart = 0;\n    this.lineOracle = lineOracle;\n  };\n\n  StringStream.prototype.eol = function () {return this.pos >= this.string.length};\n  StringStream.prototype.sol = function () {return this.pos == this.lineStart};\n  StringStream.prototype.peek = function () {return this.string.charAt(this.pos) || undefined};\n  StringStream.prototype.next = function () {\n    if (this.pos < this.string.length)\n      { return this.string.charAt(this.pos++) }\n  };\n  StringStream.prototype.eat = function (match) {\n    var ch = this.string.charAt(this.pos);\n    var ok;\n    if (typeof match == \"string\") { ok = ch == match; }\n    else { ok = ch && (match.test ? match.test(ch) : match(ch)); }\n    if (ok) {++this.pos; return ch}\n  };\n  StringStream.prototype.eatWhile = function (match) {\n    var start = this.pos;\n    while (this.eat(match)){}\n    return this.pos > start\n  };\n  StringStream.prototype.eatSpace = function () {\n    var start = this.pos;\n    while (/[\\s\\u00a0]/.test(this.string.charAt(this.pos))) { ++this.pos; }\n    return this.pos > start\n  };\n  StringStream.prototype.skipToEnd = function () {this.pos = this.string.length;};\n  StringStream.prototype.skipTo = function (ch) {\n    var found = this.string.indexOf(ch, this.pos);\n    if (found > -1) {this.pos = found; return true}\n  };\n  StringStream.prototype.backUp = function (n) {this.pos -= n;};\n  StringStream.prototype.column = function () {\n    if (this.lastColumnPos < this.start) {\n      this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);\n      this.lastColumnPos = this.start;\n    }\n    return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)\n  };\n  StringStream.prototype.indentation = function () {\n    return countColumn(this.string, null, this.tabSize) -\n      (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)\n  };\n  StringStream.prototype.match = function (pattern, consume, caseInsensitive) {\n    if (typeof pattern == \"string\") {\n      var cased = function (str) { return caseInsensitive ? str.toLowerCase() : str; };\n      var substr = this.string.substr(this.pos, pattern.length);\n      if (cased(substr) == cased(pattern)) {\n        if (consume !== false) { this.pos += pattern.length; }\n        return true\n      }\n    } else {\n      var match = this.string.slice(this.pos).match(pattern);\n      if (match && match.index > 0) { return null }\n      if (match && consume !== false) { this.pos += match[0].length; }\n      return match\n    }\n  };\n  StringStream.prototype.current = function (){return this.string.slice(this.start, this.pos)};\n  StringStream.prototype.hideFirstChars = function (n, inner) {\n    this.lineStart += n;\n    try { return inner() }\n    finally { this.lineStart -= n; }\n  };\n  StringStream.prototype.lookAhead = function (n) {\n    var oracle = this.lineOracle;\n    return oracle && oracle.lookAhead(n)\n  };\n  StringStream.prototype.baseToken = function () {\n    var oracle = this.lineOracle;\n    return oracle && oracle.baseToken(this.pos)\n  };\n\n  // Find the line object corresponding to the given line number.\n  function getLine(doc, n) {\n    n -= doc.first;\n    if (n < 0 || n >= doc.size) { throw new Error(\"There is no line \" + (n + doc.first) + \" in the document.\") }\n    var chunk = doc;\n    while (!chunk.lines) {\n      for (var i = 0;; ++i) {\n        var child = chunk.children[i], sz = child.chunkSize();\n        if (n < sz) { chunk = child; break }\n        n -= sz;\n      }\n    }\n    return chunk.lines[n]\n  }\n\n  // Get the part of a document between two positions, as an array of\n  // strings.\n  function getBetween(doc, start, end) {\n    var out = [], n = start.line;\n    doc.iter(start.line, end.line + 1, function (line) {\n      var text = line.text;\n      if (n == end.line) { text = text.slice(0, end.ch); }\n      if (n == start.line) { text = text.slice(start.ch); }\n      out.push(text);\n      ++n;\n    });\n    return out\n  }\n  // Get the lines between from and to, as array of strings.\n  function getLines(doc, from, to) {\n    var out = [];\n    doc.iter(from, to, function (line) { out.push(line.text); }); // iter aborts when callback returns truthy value\n    return out\n  }\n\n  // Update the height of a line, propagating the height change\n  // upwards to parent nodes.\n  function updateLineHeight(line, height) {\n    var diff = height - line.height;\n    if (diff) { for (var n = line; n; n = n.parent) { n.height += diff; } }\n  }\n\n  // Given a line object, find its line number by walking up through\n  // its parent links.\n  function lineNo(line) {\n    if (line.parent == null) { return null }\n    var cur = line.parent, no = indexOf(cur.lines, line);\n    for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {\n      for (var i = 0;; ++i) {\n        if (chunk.children[i] == cur) { break }\n        no += chunk.children[i].chunkSize();\n      }\n    }\n    return no + cur.first\n  }\n\n  // Find the line at the given vertical position, using the height\n  // information in the document tree.\n  function lineAtHeight(chunk, h) {\n    var n = chunk.first;\n    outer: do {\n      for (var i$1 = 0; i$1 < chunk.children.length; ++i$1) {\n        var child = chunk.children[i$1], ch = child.height;\n        if (h < ch) { chunk = child; continue outer }\n        h -= ch;\n        n += child.chunkSize();\n      }\n      return n\n    } while (!chunk.lines)\n    var i = 0;\n    for (; i < chunk.lines.length; ++i) {\n      var line = chunk.lines[i], lh = line.height;\n      if (h < lh) { break }\n      h -= lh;\n    }\n    return n + i\n  }\n\n  function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size}\n\n  function lineNumberFor(options, i) {\n    return String(options.lineNumberFormatter(i + options.firstLineNumber))\n  }\n\n  // A Pos instance represents a position within the text.\n  function Pos(line, ch, sticky) {\n    if ( sticky === void 0 ) sticky = null;\n\n    if (!(this instanceof Pos)) { return new Pos(line, ch, sticky) }\n    this.line = line;\n    this.ch = ch;\n    this.sticky = sticky;\n  }\n\n  // Compare two positions, return 0 if they are the same, a negative\n  // number when a is less, and a positive number otherwise.\n  function cmp(a, b) { return a.line - b.line || a.ch - b.ch }\n\n  function equalCursorPos(a, b) { return a.sticky == b.sticky && cmp(a, b) == 0 }\n\n  function copyPos(x) {return Pos(x.line, x.ch)}\n  function maxPos(a, b) { return cmp(a, b) < 0 ? b : a }\n  function minPos(a, b) { return cmp(a, b) < 0 ? a : b }\n\n  // Most of the external API clips given positions to make sure they\n  // actually exist within the document.\n  function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1))}\n  function clipPos(doc, pos) {\n    if (pos.line < doc.first) { return Pos(doc.first, 0) }\n    var last = doc.first + doc.size - 1;\n    if (pos.line > last) { return Pos(last, getLine(doc, last).text.length) }\n    return clipToLen(pos, getLine(doc, pos.line).text.length)\n  }\n  function clipToLen(pos, linelen) {\n    var ch = pos.ch;\n    if (ch == null || ch > linelen) { return Pos(pos.line, linelen) }\n    else if (ch < 0) { return Pos(pos.line, 0) }\n    else { return pos }\n  }\n  function clipPosArray(doc, array) {\n    var out = [];\n    for (var i = 0; i < array.length; i++) { out[i] = clipPos(doc, array[i]); }\n    return out\n  }\n\n  var SavedContext = function(state, lookAhead) {\n    this.state = state;\n    this.lookAhead = lookAhead;\n  };\n\n  var Context = function(doc, state, line, lookAhead) {\n    this.state = state;\n    this.doc = doc;\n    this.line = line;\n    this.maxLookAhead = lookAhead || 0;\n    this.baseTokens = null;\n    this.baseTokenPos = 1;\n  };\n\n  Context.prototype.lookAhead = function (n) {\n    var line = this.doc.getLine(this.line + n);\n    if (line != null && n > this.maxLookAhead) { this.maxLookAhead = n; }\n    return line\n  };\n\n  Context.prototype.baseToken = function (n) {\n    if (!this.baseTokens) { return null }\n    while (this.baseTokens[this.baseTokenPos] <= n)\n      { this.baseTokenPos += 2; }\n    var type = this.baseTokens[this.baseTokenPos + 1];\n    return {type: type && type.replace(/( |^)overlay .*/, \"\"),\n            size: this.baseTokens[this.baseTokenPos] - n}\n  };\n\n  Context.prototype.nextLine = function () {\n    this.line++;\n    if (this.maxLookAhead > 0) { this.maxLookAhead--; }\n  };\n\n  Context.fromSaved = function (doc, saved, line) {\n    if (saved instanceof SavedContext)\n      { return new Context(doc, copyState(doc.mode, saved.state), line, saved.lookAhead) }\n    else\n      { return new Context(doc, copyState(doc.mode, saved), line) }\n  };\n\n  Context.prototype.save = function (copy) {\n    var state = copy !== false ? copyState(this.doc.mode, this.state) : this.state;\n    return this.maxLookAhead > 0 ? new SavedContext(state, this.maxLookAhead) : state\n  };\n\n\n  // Compute a style array (an array starting with a mode generation\n  // -- for invalidation -- followed by pairs of end positions and\n  // style strings), which is used to highlight the tokens on the\n  // line.\n  function highlightLine(cm, line, context, forceToEnd) {\n    // A styles array always starts with a number identifying the\n    // mode/overlays that it is based on (for easy invalidation).\n    var st = [cm.state.modeGen], lineClasses = {};\n    // Compute the base array of styles\n    runMode(cm, line.text, cm.doc.mode, context, function (end, style) { return st.push(end, style); },\n            lineClasses, forceToEnd);\n    var state = context.state;\n\n    // Run overlays, adjust style array.\n    var loop = function ( o ) {\n      context.baseTokens = st;\n      var overlay = cm.state.overlays[o], i = 1, at = 0;\n      context.state = true;\n      runMode(cm, line.text, overlay.mode, context, function (end, style) {\n        var start = i;\n        // Ensure there's a token end at the current position, and that i points at it\n        while (at < end) {\n          var i_end = st[i];\n          if (i_end > end)\n            { st.splice(i, 1, end, st[i+1], i_end); }\n          i += 2;\n          at = Math.min(end, i_end);\n        }\n        if (!style) { return }\n        if (overlay.opaque) {\n          st.splice(start, i - start, end, \"overlay \" + style);\n          i = start + 2;\n        } else {\n          for (; start < i; start += 2) {\n            var cur = st[start+1];\n            st[start+1] = (cur ? cur + \" \" : \"\") + \"overlay \" + style;\n          }\n        }\n      }, lineClasses);\n      context.state = state;\n      context.baseTokens = null;\n      context.baseTokenPos = 1;\n    };\n\n    for (var o = 0; o < cm.state.overlays.length; ++o) loop( o );\n\n    return {styles: st, classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null}\n  }\n\n  function getLineStyles(cm, line, updateFrontier) {\n    if (!line.styles || line.styles[0] != cm.state.modeGen) {\n      var context = getContextBefore(cm, lineNo(line));\n      var resetState = line.text.length > cm.options.maxHighlightLength && copyState(cm.doc.mode, context.state);\n      var result = highlightLine(cm, line, context);\n      if (resetState) { context.state = resetState; }\n      line.stateAfter = context.save(!resetState);\n      line.styles = result.styles;\n      if (result.classes) { line.styleClasses = result.classes; }\n      else if (line.styleClasses) { line.styleClasses = null; }\n      if (updateFrontier === cm.doc.highlightFrontier)\n        { cm.doc.modeFrontier = Math.max(cm.doc.modeFrontier, ++cm.doc.highlightFrontier); }\n    }\n    return line.styles\n  }\n\n  function getContextBefore(cm, n, precise) {\n    var doc = cm.doc, display = cm.display;\n    if (!doc.mode.startState) { return new Context(doc, true, n) }\n    var start = findStartLine(cm, n, precise);\n    var saved = start > doc.first && getLine(doc, start - 1).stateAfter;\n    var context = saved ? Context.fromSaved(doc, saved, start) : new Context(doc, startState(doc.mode), start);\n\n    doc.iter(start, n, function (line) {\n      processLine(cm, line.text, context);\n      var pos = context.line;\n      line.stateAfter = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo ? context.save() : null;\n      context.nextLine();\n    });\n    if (precise) { doc.modeFrontier = context.line; }\n    return context\n  }\n\n  // Lightweight form of highlight -- proceed over this line and\n  // update state, but don't save a style array. Used for lines that\n  // aren't currently visible.\n  function processLine(cm, text, context, startAt) {\n    var mode = cm.doc.mode;\n    var stream = new StringStream(text, cm.options.tabSize, context);\n    stream.start = stream.pos = startAt || 0;\n    if (text == \"\") { callBlankLine(mode, context.state); }\n    while (!stream.eol()) {\n      readToken(mode, stream, context.state);\n      stream.start = stream.pos;\n    }\n  }\n\n  function callBlankLine(mode, state) {\n    if (mode.blankLine) { return mode.blankLine(state) }\n    if (!mode.innerMode) { return }\n    var inner = innerMode(mode, state);\n    if (inner.mode.blankLine) { return inner.mode.blankLine(inner.state) }\n  }\n\n  function readToken(mode, stream, state, inner) {\n    for (var i = 0; i < 10; i++) {\n      if (inner) { inner[0] = innerMode(mode, state).mode; }\n      var style = mode.token(stream, state);\n      if (stream.pos > stream.start) { return style }\n    }\n    throw new Error(\"Mode \" + mode.name + \" failed to advance stream.\")\n  }\n\n  var Token = function(stream, type, state) {\n    this.start = stream.start; this.end = stream.pos;\n    this.string = stream.current();\n    this.type = type || null;\n    this.state = state;\n  };\n\n  // Utility for getTokenAt and getLineTokens\n  function takeToken(cm, pos, precise, asArray) {\n    var doc = cm.doc, mode = doc.mode, style;\n    pos = clipPos(doc, pos);\n    var line = getLine(doc, pos.line), context = getContextBefore(cm, pos.line, precise);\n    var stream = new StringStream(line.text, cm.options.tabSize, context), tokens;\n    if (asArray) { tokens = []; }\n    while ((asArray || stream.pos < pos.ch) && !stream.eol()) {\n      stream.start = stream.pos;\n      style = readToken(mode, stream, context.state);\n      if (asArray) { tokens.push(new Token(stream, style, copyState(doc.mode, context.state))); }\n    }\n    return asArray ? tokens : new Token(stream, style, context.state)\n  }\n\n  function extractLineClasses(type, output) {\n    if (type) { for (;;) {\n      var lineClass = type.match(/(?:^|\\s+)line-(background-)?(\\S+)/);\n      if (!lineClass) { break }\n      type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length);\n      var prop = lineClass[1] ? \"bgClass\" : \"textClass\";\n      if (output[prop] == null)\n        { output[prop] = lineClass[2]; }\n      else if (!(new RegExp(\"(?:^|\\\\s)\" + lineClass[2] + \"(?:$|\\\\s)\")).test(output[prop]))\n        { output[prop] += \" \" + lineClass[2]; }\n    } }\n    return type\n  }\n\n  // Run the given mode's parser over a line, calling f for each token.\n  function runMode(cm, text, mode, context, f, lineClasses, forceToEnd) {\n    var flattenSpans = mode.flattenSpans;\n    if (flattenSpans == null) { flattenSpans = cm.options.flattenSpans; }\n    var curStart = 0, curStyle = null;\n    var stream = new StringStream(text, cm.options.tabSize, context), style;\n    var inner = cm.options.addModeClass && [null];\n    if (text == \"\") { extractLineClasses(callBlankLine(mode, context.state), lineClasses); }\n    while (!stream.eol()) {\n      if (stream.pos > cm.options.maxHighlightLength) {\n        flattenSpans = false;\n        if (forceToEnd) { processLine(cm, text, context, stream.pos); }\n        stream.pos = text.length;\n        style = null;\n      } else {\n        style = extractLineClasses(readToken(mode, stream, context.state, inner), lineClasses);\n      }\n      if (inner) {\n        var mName = inner[0].name;\n        if (mName) { style = \"m-\" + (style ? mName + \" \" + style : mName); }\n      }\n      if (!flattenSpans || curStyle != style) {\n        while (curStart < stream.start) {\n          curStart = Math.min(stream.start, curStart + 5000);\n          f(curStart, curStyle);\n        }\n        curStyle = style;\n      }\n      stream.start = stream.pos;\n    }\n    while (curStart < stream.pos) {\n      // Webkit seems to refuse to render text nodes longer than 57444\n      // characters, and returns inaccurate measurements in nodes\n      // starting around 5000 chars.\n      var pos = Math.min(stream.pos, curStart + 5000);\n      f(pos, curStyle);\n      curStart = pos;\n    }\n  }\n\n  // Finds the line to start with when starting a parse. Tries to\n  // find a line with a stateAfter, so that it can start with a\n  // valid state. If that fails, it returns the line with the\n  // smallest indentation, which tends to need the least context to\n  // parse correctly.\n  function findStartLine(cm, n, precise) {\n    var minindent, minline, doc = cm.doc;\n    var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100);\n    for (var search = n; search > lim; --search) {\n      if (search <= doc.first) { return doc.first }\n      var line = getLine(doc, search - 1), after = line.stateAfter;\n      if (after && (!precise || search + (after instanceof SavedContext ? after.lookAhead : 0) <= doc.modeFrontier))\n        { return search }\n      var indented = countColumn(line.text, null, cm.options.tabSize);\n      if (minline == null || minindent > indented) {\n        minline = search - 1;\n        minindent = indented;\n      }\n    }\n    return minline\n  }\n\n  function retreatFrontier(doc, n) {\n    doc.modeFrontier = Math.min(doc.modeFrontier, n);\n    if (doc.highlightFrontier < n - 10) { return }\n    var start = doc.first;\n    for (var line = n - 1; line > start; line--) {\n      var saved = getLine(doc, line).stateAfter;\n      // change is on 3\n      // state on line 1 looked ahead 2 -- so saw 3\n      // test 1 + 2 < 3 should cover this\n      if (saved && (!(saved instanceof SavedContext) || line + saved.lookAhead < n)) {\n        start = line + 1;\n        break\n      }\n    }\n    doc.highlightFrontier = Math.min(doc.highlightFrontier, start);\n  }\n\n  // Optimize some code when these features are not used.\n  var sawReadOnlySpans = false, sawCollapsedSpans = false;\n\n  function seeReadOnlySpans() {\n    sawReadOnlySpans = true;\n  }\n\n  function seeCollapsedSpans() {\n    sawCollapsedSpans = true;\n  }\n\n  // TEXTMARKER SPANS\n\n  function MarkedSpan(marker, from, to) {\n    this.marker = marker;\n    this.from = from; this.to = to;\n  }\n\n  // Search an array of spans for a span matching the given marker.\n  function getMarkedSpanFor(spans, marker) {\n    if (spans) { for (var i = 0; i < spans.length; ++i) {\n      var span = spans[i];\n      if (span.marker == marker) { return span }\n    } }\n  }\n\n  // Remove a span from an array, returning undefined if no spans are\n  // left (we don't store arrays for lines without spans).\n  function removeMarkedSpan(spans, span) {\n    var r;\n    for (var i = 0; i < spans.length; ++i)\n      { if (spans[i] != span) { (r || (r = [])).push(spans[i]); } }\n    return r\n  }\n\n  // Add a span to a line.\n  function addMarkedSpan(line, span, op) {\n    var inThisOp = op && window.WeakSet && (op.markedSpans || (op.markedSpans = new WeakSet));\n    if (inThisOp && inThisOp.has(line.markedSpans)) {\n      line.markedSpans.push(span);\n    } else {\n      line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];\n      if (inThisOp) { inThisOp.add(line.markedSpans); }\n    }\n    span.marker.attachLine(line);\n  }\n\n  // Used for the algorithm that adjusts markers for a change in the\n  // document. These functions cut an array of spans at a given\n  // character position, returning an array of remaining chunks (or\n  // undefined if nothing remains).\n  function markedSpansBefore(old, startCh, isInsert) {\n    var nw;\n    if (old) { for (var i = 0; i < old.length; ++i) {\n      var span = old[i], marker = span.marker;\n      var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);\n      if (startsBefore || span.from == startCh && marker.type == \"bookmark\" && (!isInsert || !span.marker.insertLeft)) {\n        var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh)\n        ;(nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to));\n      }\n    } }\n    return nw\n  }\n  function markedSpansAfter(old, endCh, isInsert) {\n    var nw;\n    if (old) { for (var i = 0; i < old.length; ++i) {\n      var span = old[i], marker = span.marker;\n      var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);\n      if (endsAfter || span.from == endCh && marker.type == \"bookmark\" && (!isInsert || span.marker.insertLeft)) {\n        var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh)\n        ;(nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,\n                                              span.to == null ? null : span.to - endCh));\n      }\n    } }\n    return nw\n  }\n\n  // Given a change object, compute the new set of marker spans that\n  // cover the line in which the change took place. Removes spans\n  // entirely within the change, reconnects spans belonging to the\n  // same marker that appear on both sides of the change, and cuts off\n  // spans partially within the change. Returns an array of span\n  // arrays with one element for each line in (after) the change.\n  function stretchSpansOverChange(doc, change) {\n    if (change.full) { return null }\n    var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;\n    var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;\n    if (!oldFirst && !oldLast) { return null }\n\n    var startCh = change.from.ch, endCh = change.to.ch, isInsert = cmp(change.from, change.to) == 0;\n    // Get the spans that 'stick out' on both sides\n    var first = markedSpansBefore(oldFirst, startCh, isInsert);\n    var last = markedSpansAfter(oldLast, endCh, isInsert);\n\n    // Next, merge those two ends\n    var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0);\n    if (first) {\n      // Fix up .to properties of first\n      for (var i = 0; i < first.length; ++i) {\n        var span = first[i];\n        if (span.to == null) {\n          var found = getMarkedSpanFor(last, span.marker);\n          if (!found) { span.to = startCh; }\n          else if (sameLine) { span.to = found.to == null ? null : found.to + offset; }\n        }\n      }\n    }\n    if (last) {\n      // Fix up .from in last (or move them into first in case of sameLine)\n      for (var i$1 = 0; i$1 < last.length; ++i$1) {\n        var span$1 = last[i$1];\n        if (span$1.to != null) { span$1.to += offset; }\n        if (span$1.from == null) {\n          var found$1 = getMarkedSpanFor(first, span$1.marker);\n          if (!found$1) {\n            span$1.from = offset;\n            if (sameLine) { (first || (first = [])).push(span$1); }\n          }\n        } else {\n          span$1.from += offset;\n          if (sameLine) { (first || (first = [])).push(span$1); }\n        }\n      }\n    }\n    // Make sure we didn't create any zero-length spans\n    if (first) { first = clearEmptySpans(first); }\n    if (last && last != first) { last = clearEmptySpans(last); }\n\n    var newMarkers = [first];\n    if (!sameLine) {\n      // Fill gap with whole-line-spans\n      var gap = change.text.length - 2, gapMarkers;\n      if (gap > 0 && first)\n        { for (var i$2 = 0; i$2 < first.length; ++i$2)\n          { if (first[i$2].to == null)\n            { (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i$2].marker, null, null)); } } }\n      for (var i$3 = 0; i$3 < gap; ++i$3)\n        { newMarkers.push(gapMarkers); }\n      newMarkers.push(last);\n    }\n    return newMarkers\n  }\n\n  // Remove spans that are empty and don't have a clearWhenEmpty\n  // option of false.\n  function clearEmptySpans(spans) {\n    for (var i = 0; i < spans.length; ++i) {\n      var span = spans[i];\n      if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false)\n        { spans.splice(i--, 1); }\n    }\n    if (!spans.length) { return null }\n    return spans\n  }\n\n  // Used to 'clip' out readOnly ranges when making a change.\n  function removeReadOnlyRanges(doc, from, to) {\n    var markers = null;\n    doc.iter(from.line, to.line + 1, function (line) {\n      if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {\n        var mark = line.markedSpans[i].marker;\n        if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))\n          { (markers || (markers = [])).push(mark); }\n      } }\n    });\n    if (!markers) { return null }\n    var parts = [{from: from, to: to}];\n    for (var i = 0; i < markers.length; ++i) {\n      var mk = markers[i], m = mk.find(0);\n      for (var j = 0; j < parts.length; ++j) {\n        var p = parts[j];\n        if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) { continue }\n        var newParts = [j, 1], dfrom = cmp(p.from, m.from), dto = cmp(p.to, m.to);\n        if (dfrom < 0 || !mk.inclusiveLeft && !dfrom)\n          { newParts.push({from: p.from, to: m.from}); }\n        if (dto > 0 || !mk.inclusiveRight && !dto)\n          { newParts.push({from: m.to, to: p.to}); }\n        parts.splice.apply(parts, newParts);\n        j += newParts.length - 3;\n      }\n    }\n    return parts\n  }\n\n  // Connect or disconnect spans from a line.\n  function detachMarkedSpans(line) {\n    var spans = line.markedSpans;\n    if (!spans) { return }\n    for (var i = 0; i < spans.length; ++i)\n      { spans[i].marker.detachLine(line); }\n    line.markedSpans = null;\n  }\n  function attachMarkedSpans(line, spans) {\n    if (!spans) { return }\n    for (var i = 0; i < spans.length; ++i)\n      { spans[i].marker.attachLine(line); }\n    line.markedSpans = spans;\n  }\n\n  // Helpers used when computing which overlapping collapsed span\n  // counts as the larger one.\n  function extraLeft(marker) { return marker.inclusiveLeft ? -1 : 0 }\n  function extraRight(marker) { return marker.inclusiveRight ? 1 : 0 }\n\n  // Returns a number indicating which of two overlapping collapsed\n  // spans is larger (and thus includes the other). Falls back to\n  // comparing ids when the spans cover exactly the same range.\n  function compareCollapsedMarkers(a, b) {\n    var lenDiff = a.lines.length - b.lines.length;\n    if (lenDiff != 0) { return lenDiff }\n    var aPos = a.find(), bPos = b.find();\n    var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b);\n    if (fromCmp) { return -fromCmp }\n    var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b);\n    if (toCmp) { return toCmp }\n    return b.id - a.id\n  }\n\n  // Find out whether a line ends or starts in a collapsed span. If\n  // so, return the marker for that span.\n  function collapsedSpanAtSide(line, start) {\n    var sps = sawCollapsedSpans && line.markedSpans, found;\n    if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {\n      sp = sps[i];\n      if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&\n          (!found || compareCollapsedMarkers(found, sp.marker) < 0))\n        { found = sp.marker; }\n    } }\n    return found\n  }\n  function collapsedSpanAtStart(line) { return collapsedSpanAtSide(line, true) }\n  function collapsedSpanAtEnd(line) { return collapsedSpanAtSide(line, false) }\n\n  function collapsedSpanAround(line, ch) {\n    var sps = sawCollapsedSpans && line.markedSpans, found;\n    if (sps) { for (var i = 0; i < sps.length; ++i) {\n      var sp = sps[i];\n      if (sp.marker.collapsed && (sp.from == null || sp.from < ch) && (sp.to == null || sp.to > ch) &&\n          (!found || compareCollapsedMarkers(found, sp.marker) < 0)) { found = sp.marker; }\n    } }\n    return found\n  }\n\n  // Test whether there exists a collapsed span that partially\n  // overlaps (covers the start or end, but not both) of a new span.\n  // Such overlap is not allowed.\n  function conflictingCollapsedRange(doc, lineNo, from, to, marker) {\n    var line = getLine(doc, lineNo);\n    var sps = sawCollapsedSpans && line.markedSpans;\n    if (sps) { for (var i = 0; i < sps.length; ++i) {\n      var sp = sps[i];\n      if (!sp.marker.collapsed) { continue }\n      var found = sp.marker.find(0);\n      var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);\n      var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);\n      if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) { continue }\n      if (fromCmp <= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.to, from) >= 0 : cmp(found.to, from) > 0) ||\n          fromCmp >= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.from, to) <= 0 : cmp(found.from, to) < 0))\n        { return true }\n    } }\n  }\n\n  // A visual line is a line as drawn on the screen. Folding, for\n  // example, can cause multiple logical lines to appear on the same\n  // visual line. This finds the start of the visual line that the\n  // given line is part of (usually that is the line itself).\n  function visualLine(line) {\n    var merged;\n    while (merged = collapsedSpanAtStart(line))\n      { line = merged.find(-1, true).line; }\n    return line\n  }\n\n  function visualLineEnd(line) {\n    var merged;\n    while (merged = collapsedSpanAtEnd(line))\n      { line = merged.find(1, true).line; }\n    return line\n  }\n\n  // Returns an array of logical lines that continue the visual line\n  // started by the argument, or undefined if there are no such lines.\n  function visualLineContinued(line) {\n    var merged, lines;\n    while (merged = collapsedSpanAtEnd(line)) {\n      line = merged.find(1, true).line\n      ;(lines || (lines = [])).push(line);\n    }\n    return lines\n  }\n\n  // Get the line number of the start of the visual line that the\n  // given line number is part of.\n  function visualLineNo(doc, lineN) {\n    var line = getLine(doc, lineN), vis = visualLine(line);\n    if (line == vis) { return lineN }\n    return lineNo(vis)\n  }\n\n  // Get the line number of the start of the next visual line after\n  // the given line.\n  function visualLineEndNo(doc, lineN) {\n    if (lineN > doc.lastLine()) { return lineN }\n    var line = getLine(doc, lineN), merged;\n    if (!lineIsHidden(doc, line)) { return lineN }\n    while (merged = collapsedSpanAtEnd(line))\n      { line = merged.find(1, true).line; }\n    return lineNo(line) + 1\n  }\n\n  // Compute whether a line is hidden. Lines count as hidden when they\n  // are part of a visual line that starts with another line, or when\n  // they are entirely covered by collapsed, non-widget span.\n  function lineIsHidden(doc, line) {\n    var sps = sawCollapsedSpans && line.markedSpans;\n    if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {\n      sp = sps[i];\n      if (!sp.marker.collapsed) { continue }\n      if (sp.from == null) { return true }\n      if (sp.marker.widgetNode) { continue }\n      if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))\n        { return true }\n    } }\n  }\n  function lineIsHiddenInner(doc, line, span) {\n    if (span.to == null) {\n      var end = span.marker.find(1, true);\n      return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker))\n    }\n    if (span.marker.inclusiveRight && span.to == line.text.length)\n      { return true }\n    for (var sp = (void 0), i = 0; i < line.markedSpans.length; ++i) {\n      sp = line.markedSpans[i];\n      if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&\n          (sp.to == null || sp.to != span.from) &&\n          (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&\n          lineIsHiddenInner(doc, line, sp)) { return true }\n    }\n  }\n\n  // Find the height above the given line.\n  function heightAtLine(lineObj) {\n    lineObj = visualLine(lineObj);\n\n    var h = 0, chunk = lineObj.parent;\n    for (var i = 0; i < chunk.lines.length; ++i) {\n      var line = chunk.lines[i];\n      if (line == lineObj) { break }\n      else { h += line.height; }\n    }\n    for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {\n      for (var i$1 = 0; i$1 < p.children.length; ++i$1) {\n        var cur = p.children[i$1];\n        if (cur == chunk) { break }\n        else { h += cur.height; }\n      }\n    }\n    return h\n  }\n\n  // Compute the character length of a line, taking into account\n  // collapsed ranges (see markText) that might hide parts, and join\n  // other lines onto it.\n  function lineLength(line) {\n    if (line.height == 0) { return 0 }\n    var len = line.text.length, merged, cur = line;\n    while (merged = collapsedSpanAtStart(cur)) {\n      var found = merged.find(0, true);\n      cur = found.from.line;\n      len += found.from.ch - found.to.ch;\n    }\n    cur = line;\n    while (merged = collapsedSpanAtEnd(cur)) {\n      var found$1 = merged.find(0, true);\n      len -= cur.text.length - found$1.from.ch;\n      cur = found$1.to.line;\n      len += cur.text.length - found$1.to.ch;\n    }\n    return len\n  }\n\n  // Find the longest line in the document.\n  function findMaxLine(cm) {\n    var d = cm.display, doc = cm.doc;\n    d.maxLine = getLine(doc, doc.first);\n    d.maxLineLength = lineLength(d.maxLine);\n    d.maxLineChanged = true;\n    doc.iter(function (line) {\n      var len = lineLength(line);\n      if (len > d.maxLineLength) {\n        d.maxLineLength = len;\n        d.maxLine = line;\n      }\n    });\n  }\n\n  // LINE DATA STRUCTURE\n\n  // Line objects. These hold state related to a line, including\n  // highlighting info (the styles array).\n  var Line = function(text, markedSpans, estimateHeight) {\n    this.text = text;\n    attachMarkedSpans(this, markedSpans);\n    this.height = estimateHeight ? estimateHeight(this) : 1;\n  };\n\n  Line.prototype.lineNo = function () { return lineNo(this) };\n  eventMixin(Line);\n\n  // Change the content (text, markers) of a line. Automatically\n  // invalidates cached information and tries to re-estimate the\n  // line's height.\n  function updateLine(line, text, markedSpans, estimateHeight) {\n    line.text = text;\n    if (line.stateAfter) { line.stateAfter = null; }\n    if (line.styles) { line.styles = null; }\n    if (line.order != null) { line.order = null; }\n    detachMarkedSpans(line);\n    attachMarkedSpans(line, markedSpans);\n    var estHeight = estimateHeight ? estimateHeight(line) : 1;\n    if (estHeight != line.height) { updateLineHeight(line, estHeight); }\n  }\n\n  // Detach a line from the document tree and its markers.\n  function cleanUpLine(line) {\n    line.parent = null;\n    detachMarkedSpans(line);\n  }\n\n  // Convert a style as returned by a mode (either null, or a string\n  // containing one or more styles) to a CSS style. This is cached,\n  // and also looks for line-wide styles.\n  var styleToClassCache = {}, styleToClassCacheWithMode = {};\n  function interpretTokenStyle(style, options) {\n    if (!style || /^\\s*$/.test(style)) { return null }\n    var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache;\n    return cache[style] ||\n      (cache[style] = style.replace(/\\S+/g, \"cm-$&\"))\n  }\n\n  // Render the DOM representation of the text of a line. Also builds\n  // up a 'line map', which points at the DOM nodes that represent\n  // specific stretches of text, and is used by the measuring code.\n  // The returned object contains the DOM node, this map, and\n  // information about line-wide styles that were set by the mode.\n  function buildLineContent(cm, lineView) {\n    // The padding-right forces the element to have a 'border', which\n    // is needed on Webkit to be able to get line-level bounding\n    // rectangles for it (in measureChar).\n    var content = eltP(\"span\", null, null, webkit ? \"padding-right: .1px\" : null);\n    var builder = {pre: eltP(\"pre\", [content], \"CodeMirror-line\"), content: content,\n                   col: 0, pos: 0, cm: cm,\n                   trailingSpace: false,\n                   splitSpaces: cm.getOption(\"lineWrapping\")};\n    lineView.measure = {};\n\n    // Iterate over the logical lines that make up this visual line.\n    for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {\n      var line = i ? lineView.rest[i - 1] : lineView.line, order = (void 0);\n      builder.pos = 0;\n      builder.addToken = buildToken;\n      // Optionally wire in some hacks into the token-rendering\n      // algorithm, to deal with browser quirks.\n      if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line, cm.doc.direction)))\n        { builder.addToken = buildTokenBadBidi(builder.addToken, order); }\n      builder.map = [];\n      var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line);\n      insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate));\n      if (line.styleClasses) {\n        if (line.styleClasses.bgClass)\n          { builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || \"\"); }\n        if (line.styleClasses.textClass)\n          { builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || \"\"); }\n      }\n\n      // Ensure at least a single node is present, for measuring.\n      if (builder.map.length == 0)\n        { builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure))); }\n\n      // Store the map and a cache object for the current logical line\n      if (i == 0) {\n        lineView.measure.map = builder.map;\n        lineView.measure.cache = {};\n      } else {\n  (lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map)\n        ;(lineView.measure.caches || (lineView.measure.caches = [])).push({});\n      }\n    }\n\n    // See issue #2901\n    if (webkit) {\n      var last = builder.content.lastChild;\n      if (/\\bcm-tab\\b/.test(last.className) || (last.querySelector && last.querySelector(\".cm-tab\")))\n        { builder.content.className = \"cm-tab-wrap-hack\"; }\n    }\n\n    signal(cm, \"renderLine\", cm, lineView.line, builder.pre);\n    if (builder.pre.className)\n      { builder.textClass = joinClasses(builder.pre.className, builder.textClass || \"\"); }\n\n    return builder\n  }\n\n  function defaultSpecialCharPlaceholder(ch) {\n    var token = elt(\"span\", \"\\u2022\", \"cm-invalidchar\");\n    token.title = \"\\\\u\" + ch.charCodeAt(0).toString(16);\n    token.setAttribute(\"aria-label\", token.title);\n    return token\n  }\n\n  // Build up the DOM representation for a single token, and add it to\n  // the line map. Takes care to render special characters separately.\n  function buildToken(builder, text, style, startStyle, endStyle, css, attributes) {\n    if (!text) { return }\n    var displayText = builder.splitSpaces ? splitSpaces(text, builder.trailingSpace) : text;\n    var special = builder.cm.state.specialChars, mustWrap = false;\n    var content;\n    if (!special.test(text)) {\n      builder.col += text.length;\n      content = document.createTextNode(displayText);\n      builder.map.push(builder.pos, builder.pos + text.length, content);\n      if (ie && ie_version < 9) { mustWrap = true; }\n      builder.pos += text.length;\n    } else {\n      content = document.createDocumentFragment();\n      var pos = 0;\n      while (true) {\n        special.lastIndex = pos;\n        var m = special.exec(text);\n        var skipped = m ? m.index - pos : text.length - pos;\n        if (skipped) {\n          var txt = document.createTextNode(displayText.slice(pos, pos + skipped));\n          if (ie && ie_version < 9) { content.appendChild(elt(\"span\", [txt])); }\n          else { content.appendChild(txt); }\n          builder.map.push(builder.pos, builder.pos + skipped, txt);\n          builder.col += skipped;\n          builder.pos += skipped;\n        }\n        if (!m) { break }\n        pos += skipped + 1;\n        var txt$1 = (void 0);\n        if (m[0] == \"\\t\") {\n          var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;\n          txt$1 = content.appendChild(elt(\"span\", spaceStr(tabWidth), \"cm-tab\"));\n          txt$1.setAttribute(\"role\", \"presentation\");\n          txt$1.setAttribute(\"cm-text\", \"\\t\");\n          builder.col += tabWidth;\n        } else if (m[0] == \"\\r\" || m[0] == \"\\n\") {\n          txt$1 = content.appendChild(elt(\"span\", m[0] == \"\\r\" ? \"\\u240d\" : \"\\u2424\", \"cm-invalidchar\"));\n          txt$1.setAttribute(\"cm-text\", m[0]);\n          builder.col += 1;\n        } else {\n          txt$1 = builder.cm.options.specialCharPlaceholder(m[0]);\n          txt$1.setAttribute(\"cm-text\", m[0]);\n          if (ie && ie_version < 9) { content.appendChild(elt(\"span\", [txt$1])); }\n          else { content.appendChild(txt$1); }\n          builder.col += 1;\n        }\n        builder.map.push(builder.pos, builder.pos + 1, txt$1);\n        builder.pos++;\n      }\n    }\n    builder.trailingSpace = displayText.charCodeAt(text.length - 1) == 32;\n    if (style || startStyle || endStyle || mustWrap || css || attributes) {\n      var fullStyle = style || \"\";\n      if (startStyle) { fullStyle += startStyle; }\n      if (endStyle) { fullStyle += endStyle; }\n      var token = elt(\"span\", [content], fullStyle, css);\n      if (attributes) {\n        for (var attr in attributes) { if (attributes.hasOwnProperty(attr) && attr != \"style\" && attr != \"class\")\n          { token.setAttribute(attr, attributes[attr]); } }\n      }\n      return builder.content.appendChild(token)\n    }\n    builder.content.appendChild(content);\n  }\n\n  // Change some spaces to NBSP to prevent the browser from collapsing\n  // trailing spaces at the end of a line when rendering text (issue #1362).\n  function splitSpaces(text, trailingBefore) {\n    if (text.length > 1 && !/  /.test(text)) { return text }\n    var spaceBefore = trailingBefore, result = \"\";\n    for (var i = 0; i < text.length; i++) {\n      var ch = text.charAt(i);\n      if (ch == \" \" && spaceBefore && (i == text.length - 1 || text.charCodeAt(i + 1) == 32))\n        { ch = \"\\u00a0\"; }\n      result += ch;\n      spaceBefore = ch == \" \";\n    }\n    return result\n  }\n\n  // Work around nonsense dimensions being reported for stretches of\n  // right-to-left text.\n  function buildTokenBadBidi(inner, order) {\n    return function (builder, text, style, startStyle, endStyle, css, attributes) {\n      style = style ? style + \" cm-force-border\" : \"cm-force-border\";\n      var start = builder.pos, end = start + text.length;\n      for (;;) {\n        // Find the part that overlaps with the start of this text\n        var part = (void 0);\n        for (var i = 0; i < order.length; i++) {\n          part = order[i];\n          if (part.to > start && part.from <= start) { break }\n        }\n        if (part.to >= end) { return inner(builder, text, style, startStyle, endStyle, css, attributes) }\n        inner(builder, text.slice(0, part.to - start), style, startStyle, null, css, attributes);\n        startStyle = null;\n        text = text.slice(part.to - start);\n        start = part.to;\n      }\n    }\n  }\n\n  function buildCollapsedSpan(builder, size, marker, ignoreWidget) {\n    var widget = !ignoreWidget && marker.widgetNode;\n    if (widget) { builder.map.push(builder.pos, builder.pos + size, widget); }\n    if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {\n      if (!widget)\n        { widget = builder.content.appendChild(document.createElement(\"span\")); }\n      widget.setAttribute(\"cm-marker\", marker.id);\n    }\n    if (widget) {\n      builder.cm.display.input.setUneditable(widget);\n      builder.content.appendChild(widget);\n    }\n    builder.pos += size;\n    builder.trailingSpace = false;\n  }\n\n  // Outputs a number of spans to make up a line, taking highlighting\n  // and marked text into account.\n  function insertLineContent(line, builder, styles) {\n    var spans = line.markedSpans, allText = line.text, at = 0;\n    if (!spans) {\n      for (var i$1 = 1; i$1 < styles.length; i$1+=2)\n        { builder.addToken(builder, allText.slice(at, at = styles[i$1]), interpretTokenStyle(styles[i$1+1], builder.cm.options)); }\n      return\n    }\n\n    var len = allText.length, pos = 0, i = 1, text = \"\", style, css;\n    var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, collapsed, attributes;\n    for (;;) {\n      if (nextChange == pos) { // Update current marker set\n        spanStyle = spanEndStyle = spanStartStyle = css = \"\";\n        attributes = null;\n        collapsed = null; nextChange = Infinity;\n        var foundBookmarks = [], endStyles = (void 0);\n        for (var j = 0; j < spans.length; ++j) {\n          var sp = spans[j], m = sp.marker;\n          if (m.type == \"bookmark\" && sp.from == pos && m.widgetNode) {\n            foundBookmarks.push(m);\n          } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {\n            if (sp.to != null && sp.to != pos && nextChange > sp.to) {\n              nextChange = sp.to;\n              spanEndStyle = \"\";\n            }\n            if (m.className) { spanStyle += \" \" + m.className; }\n            if (m.css) { css = (css ? css + \";\" : \"\") + m.css; }\n            if (m.startStyle && sp.from == pos) { spanStartStyle += \" \" + m.startStyle; }\n            if (m.endStyle && sp.to == nextChange) { (endStyles || (endStyles = [])).push(m.endStyle, sp.to); }\n            // support for the old title property\n            // https://github.com/codemirror/CodeMirror/pull/5673\n            if (m.title) { (attributes || (attributes = {})).title = m.title; }\n            if (m.attributes) {\n              for (var attr in m.attributes)\n                { (attributes || (attributes = {}))[attr] = m.attributes[attr]; }\n            }\n            if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0))\n              { collapsed = sp; }\n          } else if (sp.from > pos && nextChange > sp.from) {\n            nextChange = sp.from;\n          }\n        }\n        if (endStyles) { for (var j$1 = 0; j$1 < endStyles.length; j$1 += 2)\n          { if (endStyles[j$1 + 1] == nextChange) { spanEndStyle += \" \" + endStyles[j$1]; } } }\n\n        if (!collapsed || collapsed.from == pos) { for (var j$2 = 0; j$2 < foundBookmarks.length; ++j$2)\n          { buildCollapsedSpan(builder, 0, foundBookmarks[j$2]); } }\n        if (collapsed && (collapsed.from || 0) == pos) {\n          buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,\n                             collapsed.marker, collapsed.from == null);\n          if (collapsed.to == null) { return }\n          if (collapsed.to == pos) { collapsed = false; }\n        }\n      }\n      if (pos >= len) { break }\n\n      var upto = Math.min(len, nextChange);\n      while (true) {\n        if (text) {\n          var end = pos + text.length;\n          if (!collapsed) {\n            var tokenText = end > upto ? text.slice(0, upto - pos) : text;\n            builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,\n                             spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : \"\", css, attributes);\n          }\n          if (end >= upto) {text = text.slice(upto - pos); pos = upto; break}\n          pos = end;\n          spanStartStyle = \"\";\n        }\n        text = allText.slice(at, at = styles[i++]);\n        style = interpretTokenStyle(styles[i++], builder.cm.options);\n      }\n    }\n  }\n\n\n  // These objects are used to represent the visible (currently drawn)\n  // part of the document. A LineView may correspond to multiple\n  // logical lines, if those are connected by collapsed ranges.\n  function LineView(doc, line, lineN) {\n    // The starting line\n    this.line = line;\n    // Continuing lines, if any\n    this.rest = visualLineContinued(line);\n    // Number of logical lines in this visual line\n    this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1;\n    this.node = this.text = null;\n    this.hidden = lineIsHidden(doc, line);\n  }\n\n  // Create a range of LineView objects for the given lines.\n  function buildViewArray(cm, from, to) {\n    var array = [], nextPos;\n    for (var pos = from; pos < to; pos = nextPos) {\n      var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);\n      nextPos = pos + view.size;\n      array.push(view);\n    }\n    return array\n  }\n\n  var operationGroup = null;\n\n  function pushOperation(op) {\n    if (operationGroup) {\n      operationGroup.ops.push(op);\n    } else {\n      op.ownsGroup = operationGroup = {\n        ops: [op],\n        delayedCallbacks: []\n      };\n    }\n  }\n\n  function fireCallbacksForOps(group) {\n    // Calls delayed callbacks and cursorActivity handlers until no\n    // new ones appear\n    var callbacks = group.delayedCallbacks, i = 0;\n    do {\n      for (; i < callbacks.length; i++)\n        { callbacks[i].call(null); }\n      for (var j = 0; j < group.ops.length; j++) {\n        var op = group.ops[j];\n        if (op.cursorActivityHandlers)\n          { while (op.cursorActivityCalled < op.cursorActivityHandlers.length)\n            { op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm); } }\n      }\n    } while (i < callbacks.length)\n  }\n\n  function finishOperation(op, endCb) {\n    var group = op.ownsGroup;\n    if (!group) { return }\n\n    try { fireCallbacksForOps(group); }\n    finally {\n      operationGroup = null;\n      endCb(group);\n    }\n  }\n\n  var orphanDelayedCallbacks = null;\n\n  // Often, we want to signal events at a point where we are in the\n  // middle of some work, but don't want the handler to start calling\n  // other methods on the editor, which might be in an inconsistent\n  // state or simply not expect any other events to happen.\n  // signalLater looks whether there are any handlers, and schedules\n  // them to be executed when the last operation ends, or, if no\n  // operation is active, when a timeout fires.\n  function signalLater(emitter, type /*, values...*/) {\n    var arr = getHandlers(emitter, type);\n    if (!arr.length) { return }\n    var args = Array.prototype.slice.call(arguments, 2), list;\n    if (operationGroup) {\n      list = operationGroup.delayedCallbacks;\n    } else if (orphanDelayedCallbacks) {\n      list = orphanDelayedCallbacks;\n    } else {\n      list = orphanDelayedCallbacks = [];\n      setTimeout(fireOrphanDelayed, 0);\n    }\n    var loop = function ( i ) {\n      list.push(function () { return arr[i].apply(null, args); });\n    };\n\n    for (var i = 0; i < arr.length; ++i)\n      loop( i );\n  }\n\n  function fireOrphanDelayed() {\n    var delayed = orphanDelayedCallbacks;\n    orphanDelayedCallbacks = null;\n    for (var i = 0; i < delayed.length; ++i) { delayed[i](); }\n  }\n\n  // When an aspect of a line changes, a string is added to\n  // lineView.changes. This updates the relevant part of the line's\n  // DOM structure.\n  function updateLineForChanges(cm, lineView, lineN, dims) {\n    for (var j = 0; j < lineView.changes.length; j++) {\n      var type = lineView.changes[j];\n      if (type == \"text\") { updateLineText(cm, lineView); }\n      else if (type == \"gutter\") { updateLineGutter(cm, lineView, lineN, dims); }\n      else if (type == \"class\") { updateLineClasses(cm, lineView); }\n      else if (type == \"widget\") { updateLineWidgets(cm, lineView, dims); }\n    }\n    lineView.changes = null;\n  }\n\n  // Lines with gutter elements, widgets or a background class need to\n  // be wrapped, and have the extra elements added to the wrapper div\n  function ensureLineWrapped(lineView) {\n    if (lineView.node == lineView.text) {\n      lineView.node = elt(\"div\", null, null, \"position: relative\");\n      if (lineView.text.parentNode)\n        { lineView.text.parentNode.replaceChild(lineView.node, lineView.text); }\n      lineView.node.appendChild(lineView.text);\n      if (ie && ie_version < 8) { lineView.node.style.zIndex = 2; }\n    }\n    return lineView.node\n  }\n\n  function updateLineBackground(cm, lineView) {\n    var cls = lineView.bgClass ? lineView.bgClass + \" \" + (lineView.line.bgClass || \"\") : lineView.line.bgClass;\n    if (cls) { cls += \" CodeMirror-linebackground\"; }\n    if (lineView.background) {\n      if (cls) { lineView.background.className = cls; }\n      else { lineView.background.parentNode.removeChild(lineView.background); lineView.background = null; }\n    } else if (cls) {\n      var wrap = ensureLineWrapped(lineView);\n      lineView.background = wrap.insertBefore(elt(\"div\", null, cls), wrap.firstChild);\n      cm.display.input.setUneditable(lineView.background);\n    }\n  }\n\n  // Wrapper around buildLineContent which will reuse the structure\n  // in display.externalMeasured when possible.\n  function getLineContent(cm, lineView) {\n    var ext = cm.display.externalMeasured;\n    if (ext && ext.line == lineView.line) {\n      cm.display.externalMeasured = null;\n      lineView.measure = ext.measure;\n      return ext.built\n    }\n    return buildLineContent(cm, lineView)\n  }\n\n  // Redraw the line's text. Interacts with the background and text\n  // classes because the mode may output tokens that influence these\n  // classes.\n  function updateLineText(cm, lineView) {\n    var cls = lineView.text.className;\n    var built = getLineContent(cm, lineView);\n    if (lineView.text == lineView.node) { lineView.node = built.pre; }\n    lineView.text.parentNode.replaceChild(built.pre, lineView.text);\n    lineView.text = built.pre;\n    if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {\n      lineView.bgClass = built.bgClass;\n      lineView.textClass = built.textClass;\n      updateLineClasses(cm, lineView);\n    } else if (cls) {\n      lineView.text.className = cls;\n    }\n  }\n\n  function updateLineClasses(cm, lineView) {\n    updateLineBackground(cm, lineView);\n    if (lineView.line.wrapClass)\n      { ensureLineWrapped(lineView).className = lineView.line.wrapClass; }\n    else if (lineView.node != lineView.text)\n      { lineView.node.className = \"\"; }\n    var textClass = lineView.textClass ? lineView.textClass + \" \" + (lineView.line.textClass || \"\") : lineView.line.textClass;\n    lineView.text.className = textClass || \"\";\n  }\n\n  function updateLineGutter(cm, lineView, lineN, dims) {\n    if (lineView.gutter) {\n      lineView.node.removeChild(lineView.gutter);\n      lineView.gutter = null;\n    }\n    if (lineView.gutterBackground) {\n      lineView.node.removeChild(lineView.gutterBackground);\n      lineView.gutterBackground = null;\n    }\n    if (lineView.line.gutterClass) {\n      var wrap = ensureLineWrapped(lineView);\n      lineView.gutterBackground = elt(\"div\", null, \"CodeMirror-gutter-background \" + lineView.line.gutterClass,\n                                      (\"left: \" + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + \"px; width: \" + (dims.gutterTotalWidth) + \"px\"));\n      cm.display.input.setUneditable(lineView.gutterBackground);\n      wrap.insertBefore(lineView.gutterBackground, lineView.text);\n    }\n    var markers = lineView.line.gutterMarkers;\n    if (cm.options.lineNumbers || markers) {\n      var wrap$1 = ensureLineWrapped(lineView);\n      var gutterWrap = lineView.gutter = elt(\"div\", null, \"CodeMirror-gutter-wrapper\", (\"left: \" + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + \"px\"));\n      gutterWrap.setAttribute(\"aria-hidden\", \"true\");\n      cm.display.input.setUneditable(gutterWrap);\n      wrap$1.insertBefore(gutterWrap, lineView.text);\n      if (lineView.line.gutterClass)\n        { gutterWrap.className += \" \" + lineView.line.gutterClass; }\n      if (cm.options.lineNumbers && (!markers || !markers[\"CodeMirror-linenumbers\"]))\n        { lineView.lineNumber = gutterWrap.appendChild(\n          elt(\"div\", lineNumberFor(cm.options, lineN),\n              \"CodeMirror-linenumber CodeMirror-gutter-elt\",\n              (\"left: \" + (dims.gutterLeft[\"CodeMirror-linenumbers\"]) + \"px; width: \" + (cm.display.lineNumInnerWidth) + \"px\"))); }\n      if (markers) { for (var k = 0; k < cm.display.gutterSpecs.length; ++k) {\n        var id = cm.display.gutterSpecs[k].className, found = markers.hasOwnProperty(id) && markers[id];\n        if (found)\n          { gutterWrap.appendChild(elt(\"div\", [found], \"CodeMirror-gutter-elt\",\n                                     (\"left: \" + (dims.gutterLeft[id]) + \"px; width: \" + (dims.gutterWidth[id]) + \"px\"))); }\n      } }\n    }\n  }\n\n  function updateLineWidgets(cm, lineView, dims) {\n    if (lineView.alignable) { lineView.alignable = null; }\n    var isWidget = classTest(\"CodeMirror-linewidget\");\n    for (var node = lineView.node.firstChild, next = (void 0); node; node = next) {\n      next = node.nextSibling;\n      if (isWidget.test(node.className)) { lineView.node.removeChild(node); }\n    }\n    insertLineWidgets(cm, lineView, dims);\n  }\n\n  // Build a line's DOM representation from scratch\n  function buildLineElement(cm, lineView, lineN, dims) {\n    var built = getLineContent(cm, lineView);\n    lineView.text = lineView.node = built.pre;\n    if (built.bgClass) { lineView.bgClass = built.bgClass; }\n    if (built.textClass) { lineView.textClass = built.textClass; }\n\n    updateLineClasses(cm, lineView);\n    updateLineGutter(cm, lineView, lineN, dims);\n    insertLineWidgets(cm, lineView, dims);\n    return lineView.node\n  }\n\n  // A lineView may contain multiple logical lines (when merged by\n  // collapsed spans). The widgets for all of them need to be drawn.\n  function insertLineWidgets(cm, lineView, dims) {\n    insertLineWidgetsFor(cm, lineView.line, lineView, dims, true);\n    if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)\n      { insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false); } }\n  }\n\n  function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {\n    if (!line.widgets) { return }\n    var wrap = ensureLineWrapped(lineView);\n    for (var i = 0, ws = line.widgets; i < ws.length; ++i) {\n      var widget = ws[i], node = elt(\"div\", [widget.node], \"CodeMirror-linewidget\" + (widget.className ? \" \" + widget.className : \"\"));\n      if (!widget.handleMouseEvents) { node.setAttribute(\"cm-ignore-events\", \"true\"); }\n      positionLineWidget(widget, node, lineView, dims);\n      cm.display.input.setUneditable(node);\n      if (allowAbove && widget.above)\n        { wrap.insertBefore(node, lineView.gutter || lineView.text); }\n      else\n        { wrap.appendChild(node); }\n      signalLater(widget, \"redraw\");\n    }\n  }\n\n  function positionLineWidget(widget, node, lineView, dims) {\n    if (widget.noHScroll) {\n  (lineView.alignable || (lineView.alignable = [])).push(node);\n      var width = dims.wrapperWidth;\n      node.style.left = dims.fixedPos + \"px\";\n      if (!widget.coverGutter) {\n        width -= dims.gutterTotalWidth;\n        node.style.paddingLeft = dims.gutterTotalWidth + \"px\";\n      }\n      node.style.width = width + \"px\";\n    }\n    if (widget.coverGutter) {\n      node.style.zIndex = 5;\n      node.style.position = \"relative\";\n      if (!widget.noHScroll) { node.style.marginLeft = -dims.gutterTotalWidth + \"px\"; }\n    }\n  }\n\n  function widgetHeight(widget) {\n    if (widget.height != null) { return widget.height }\n    var cm = widget.doc.cm;\n    if (!cm) { return 0 }\n    if (!contains(document.body, widget.node)) {\n      var parentStyle = \"position: relative;\";\n      if (widget.coverGutter)\n        { parentStyle += \"margin-left: -\" + cm.display.gutters.offsetWidth + \"px;\"; }\n      if (widget.noHScroll)\n        { parentStyle += \"width: \" + cm.display.wrapper.clientWidth + \"px;\"; }\n      removeChildrenAndAdd(cm.display.measure, elt(\"div\", [widget.node], null, parentStyle));\n    }\n    return widget.height = widget.node.parentNode.offsetHeight\n  }\n\n  // Return true when the given mouse event happened in a widget\n  function eventInWidget(display, e) {\n    for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {\n      if (!n || (n.nodeType == 1 && n.getAttribute(\"cm-ignore-events\") == \"true\") ||\n          (n.parentNode == display.sizer && n != display.mover))\n        { return true }\n    }\n  }\n\n  // POSITION MEASUREMENT\n\n  function paddingTop(display) {return display.lineSpace.offsetTop}\n  function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight}\n  function paddingH(display) {\n    if (display.cachedPaddingH) { return display.cachedPaddingH }\n    var e = removeChildrenAndAdd(display.measure, elt(\"pre\", \"x\", \"CodeMirror-line-like\"));\n    var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle;\n    var data = {left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight)};\n    if (!isNaN(data.left) && !isNaN(data.right)) { display.cachedPaddingH = data; }\n    return data\n  }\n\n  function scrollGap(cm) { return scrollerGap - cm.display.nativeBarWidth }\n  function displayWidth(cm) {\n    return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth\n  }\n  function displayHeight(cm) {\n    return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight\n  }\n\n  // Ensure the lineView.wrapping.heights array is populated. This is\n  // an array of bottom offsets for the lines that make up a drawn\n  // line. When lineWrapping is on, there might be more than one\n  // height.\n  function ensureLineHeights(cm, lineView, rect) {\n    var wrapping = cm.options.lineWrapping;\n    var curWidth = wrapping && displayWidth(cm);\n    if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {\n      var heights = lineView.measure.heights = [];\n      if (wrapping) {\n        lineView.measure.width = curWidth;\n        var rects = lineView.text.firstChild.getClientRects();\n        for (var i = 0; i < rects.length - 1; i++) {\n          var cur = rects[i], next = rects[i + 1];\n          if (Math.abs(cur.bottom - next.bottom) > 2)\n            { heights.push((cur.bottom + next.top) / 2 - rect.top); }\n        }\n      }\n      heights.push(rect.bottom - rect.top);\n    }\n  }\n\n  // Find a line map (mapping character offsets to text nodes) and a\n  // measurement cache for the given line number. (A line view might\n  // contain multiple lines when collapsed ranges are present.)\n  function mapFromLineView(lineView, line, lineN) {\n    if (lineView.line == line)\n      { return {map: lineView.measure.map, cache: lineView.measure.cache} }\n    for (var i = 0; i < lineView.rest.length; i++)\n      { if (lineView.rest[i] == line)\n        { return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]} } }\n    for (var i$1 = 0; i$1 < lineView.rest.length; i$1++)\n      { if (lineNo(lineView.rest[i$1]) > lineN)\n        { return {map: lineView.measure.maps[i$1], cache: lineView.measure.caches[i$1], before: true} } }\n  }\n\n  // Render a line into the hidden node display.externalMeasured. Used\n  // when measurement is needed for a line that's not in the viewport.\n  function updateExternalMeasurement(cm, line) {\n    line = visualLine(line);\n    var lineN = lineNo(line);\n    var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN);\n    view.lineN = lineN;\n    var built = view.built = buildLineContent(cm, view);\n    view.text = built.pre;\n    removeChildrenAndAdd(cm.display.lineMeasure, built.pre);\n    return view\n  }\n\n  // Get a {top, bottom, left, right} box (in line-local coordinates)\n  // for a given character.\n  function measureChar(cm, line, ch, bias) {\n    return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias)\n  }\n\n  // Find a line view that corresponds to the given line number.\n  function findViewForLine(cm, lineN) {\n    if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo)\n      { return cm.display.view[findViewIndex(cm, lineN)] }\n    var ext = cm.display.externalMeasured;\n    if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size)\n      { return ext }\n  }\n\n  // Measurement can be split in two steps, the set-up work that\n  // applies to the whole line, and the measurement of the actual\n  // character. Functions like coordsChar, that need to do a lot of\n  // measurements in a row, can thus ensure that the set-up work is\n  // only done once.\n  function prepareMeasureForLine(cm, line) {\n    var lineN = lineNo(line);\n    var view = findViewForLine(cm, lineN);\n    if (view && !view.text) {\n      view = null;\n    } else if (view && view.changes) {\n      updateLineForChanges(cm, view, lineN, getDimensions(cm));\n      cm.curOp.forceUpdate = true;\n    }\n    if (!view)\n      { view = updateExternalMeasurement(cm, line); }\n\n    var info = mapFromLineView(view, line, lineN);\n    return {\n      line: line, view: view, rect: null,\n      map: info.map, cache: info.cache, before: info.before,\n      hasHeights: false\n    }\n  }\n\n  // Given a prepared measurement object, measures the position of an\n  // actual character (or fetches it from the cache).\n  function measureCharPrepared(cm, prepared, ch, bias, varHeight) {\n    if (prepared.before) { ch = -1; }\n    var key = ch + (bias || \"\"), found;\n    if (prepared.cache.hasOwnProperty(key)) {\n      found = prepared.cache[key];\n    } else {\n      if (!prepared.rect)\n        { prepared.rect = prepared.view.text.getBoundingClientRect(); }\n      if (!prepared.hasHeights) {\n        ensureLineHeights(cm, prepared.view, prepared.rect);\n        prepared.hasHeights = true;\n      }\n      found = measureCharInner(cm, prepared, ch, bias);\n      if (!found.bogus) { prepared.cache[key] = found; }\n    }\n    return {left: found.left, right: found.right,\n            top: varHeight ? found.rtop : found.top,\n            bottom: varHeight ? found.rbottom : found.bottom}\n  }\n\n  var nullRect = {left: 0, right: 0, top: 0, bottom: 0};\n\n  function nodeAndOffsetInLineMap(map, ch, bias) {\n    var node, start, end, collapse, mStart, mEnd;\n    // First, search the line map for the text node corresponding to,\n    // or closest to, the target character.\n    for (var i = 0; i < map.length; i += 3) {\n      mStart = map[i];\n      mEnd = map[i + 1];\n      if (ch < mStart) {\n        start = 0; end = 1;\n        collapse = \"left\";\n      } else if (ch < mEnd) {\n        start = ch - mStart;\n        end = start + 1;\n      } else if (i == map.length - 3 || ch == mEnd && map[i + 3] > ch) {\n        end = mEnd - mStart;\n        start = end - 1;\n        if (ch >= mEnd) { collapse = \"right\"; }\n      }\n      if (start != null) {\n        node = map[i + 2];\n        if (mStart == mEnd && bias == (node.insertLeft ? \"left\" : \"right\"))\n          { collapse = bias; }\n        if (bias == \"left\" && start == 0)\n          { while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {\n            node = map[(i -= 3) + 2];\n            collapse = \"left\";\n          } }\n        if (bias == \"right\" && start == mEnd - mStart)\n          { while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {\n            node = map[(i += 3) + 2];\n            collapse = \"right\";\n          } }\n        break\n      }\n    }\n    return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd}\n  }\n\n  function getUsefulRect(rects, bias) {\n    var rect = nullRect;\n    if (bias == \"left\") { for (var i = 0; i < rects.length; i++) {\n      if ((rect = rects[i]).left != rect.right) { break }\n    } } else { for (var i$1 = rects.length - 1; i$1 >= 0; i$1--) {\n      if ((rect = rects[i$1]).left != rect.right) { break }\n    } }\n    return rect\n  }\n\n  function measureCharInner(cm, prepared, ch, bias) {\n    var place = nodeAndOffsetInLineMap(prepared.map, ch, bias);\n    var node = place.node, start = place.start, end = place.end, collapse = place.collapse;\n\n    var rect;\n    if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.\n      for (var i$1 = 0; i$1 < 4; i$1++) { // Retry a maximum of 4 times when nonsense rectangles are returned\n        while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) { --start; }\n        while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) { ++end; }\n        if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart)\n          { rect = node.parentNode.getBoundingClientRect(); }\n        else\n          { rect = getUsefulRect(range(node, start, end).getClientRects(), bias); }\n        if (rect.left || rect.right || start == 0) { break }\n        end = start;\n        start = start - 1;\n        collapse = \"right\";\n      }\n      if (ie && ie_version < 11) { rect = maybeUpdateRectForZooming(cm.display.measure, rect); }\n    } else { // If it is a widget, simply get the box for the whole widget.\n      if (start > 0) { collapse = bias = \"right\"; }\n      var rects;\n      if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)\n        { rect = rects[bias == \"right\" ? rects.length - 1 : 0]; }\n      else\n        { rect = node.getBoundingClientRect(); }\n    }\n    if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {\n      var rSpan = node.parentNode.getClientRects()[0];\n      if (rSpan)\n        { rect = {left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom}; }\n      else\n        { rect = nullRect; }\n    }\n\n    var rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top;\n    var mid = (rtop + rbot) / 2;\n    var heights = prepared.view.measure.heights;\n    var i = 0;\n    for (; i < heights.length - 1; i++)\n      { if (mid < heights[i]) { break } }\n    var top = i ? heights[i - 1] : 0, bot = heights[i];\n    var result = {left: (collapse == \"right\" ? rect.right : rect.left) - prepared.rect.left,\n                  right: (collapse == \"left\" ? rect.left : rect.right) - prepared.rect.left,\n                  top: top, bottom: bot};\n    if (!rect.left && !rect.right) { result.bogus = true; }\n    if (!cm.options.singleCursorHeightPerLine) { result.rtop = rtop; result.rbottom = rbot; }\n\n    return result\n  }\n\n  // Work around problem with bounding client rects on ranges being\n  // returned incorrectly when zoomed on IE10 and below.\n  function maybeUpdateRectForZooming(measure, rect) {\n    if (!window.screen || screen.logicalXDPI == null ||\n        screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure))\n      { return rect }\n    var scaleX = screen.logicalXDPI / screen.deviceXDPI;\n    var scaleY = screen.logicalYDPI / screen.deviceYDPI;\n    return {left: rect.left * scaleX, right: rect.right * scaleX,\n            top: rect.top * scaleY, bottom: rect.bottom * scaleY}\n  }\n\n  function clearLineMeasurementCacheFor(lineView) {\n    if (lineView.measure) {\n      lineView.measure.cache = {};\n      lineView.measure.heights = null;\n      if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)\n        { lineView.measure.caches[i] = {}; } }\n    }\n  }\n\n  function clearLineMeasurementCache(cm) {\n    cm.display.externalMeasure = null;\n    removeChildren(cm.display.lineMeasure);\n    for (var i = 0; i < cm.display.view.length; i++)\n      { clearLineMeasurementCacheFor(cm.display.view[i]); }\n  }\n\n  function clearCaches(cm) {\n    clearLineMeasurementCache(cm);\n    cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null;\n    if (!cm.options.lineWrapping) { cm.display.maxLineChanged = true; }\n    cm.display.lineNumChars = null;\n  }\n\n  function pageScrollX() {\n    // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206\n    // which causes page_Offset and bounding client rects to use\n    // different reference viewports and invalidate our calculations.\n    if (chrome && android) { return -(document.body.getBoundingClientRect().left - parseInt(getComputedStyle(document.body).marginLeft)) }\n    return window.pageXOffset || (document.documentElement || document.body).scrollLeft\n  }\n  function pageScrollY() {\n    if (chrome && android) { return -(document.body.getBoundingClientRect().top - parseInt(getComputedStyle(document.body).marginTop)) }\n    return window.pageYOffset || (document.documentElement || document.body).scrollTop\n  }\n\n  function widgetTopHeight(lineObj) {\n    var height = 0;\n    if (lineObj.widgets) { for (var i = 0; i < lineObj.widgets.length; ++i) { if (lineObj.widgets[i].above)\n      { height += widgetHeight(lineObj.widgets[i]); } } }\n    return height\n  }\n\n  // Converts a {top, bottom, left, right} box from line-local\n  // coordinates into another coordinate system. Context may be one of\n  // \"line\", \"div\" (display.lineDiv), \"local\"./null (editor), \"window\",\n  // or \"page\".\n  function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {\n    if (!includeWidgets) {\n      var height = widgetTopHeight(lineObj);\n      rect.top += height; rect.bottom += height;\n    }\n    if (context == \"line\") { return rect }\n    if (!context) { context = \"local\"; }\n    var yOff = heightAtLine(lineObj);\n    if (context == \"local\") { yOff += paddingTop(cm.display); }\n    else { yOff -= cm.display.viewOffset; }\n    if (context == \"page\" || context == \"window\") {\n      var lOff = cm.display.lineSpace.getBoundingClientRect();\n      yOff += lOff.top + (context == \"window\" ? 0 : pageScrollY());\n      var xOff = lOff.left + (context == \"window\" ? 0 : pageScrollX());\n      rect.left += xOff; rect.right += xOff;\n    }\n    rect.top += yOff; rect.bottom += yOff;\n    return rect\n  }\n\n  // Coverts a box from \"div\" coords to another coordinate system.\n  // Context may be \"window\", \"page\", \"div\", or \"local\"./null.\n  function fromCoordSystem(cm, coords, context) {\n    if (context == \"div\") { return coords }\n    var left = coords.left, top = coords.top;\n    // First move into \"page\" coordinate system\n    if (context == \"page\") {\n      left -= pageScrollX();\n      top -= pageScrollY();\n    } else if (context == \"local\" || !context) {\n      var localBox = cm.display.sizer.getBoundingClientRect();\n      left += localBox.left;\n      top += localBox.top;\n    }\n\n    var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect();\n    return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top}\n  }\n\n  function charCoords(cm, pos, context, lineObj, bias) {\n    if (!lineObj) { lineObj = getLine(cm.doc, pos.line); }\n    return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context)\n  }\n\n  // Returns a box for a given cursor position, which may have an\n  // 'other' property containing the position of the secondary cursor\n  // on a bidi boundary.\n  // A cursor Pos(line, char, \"before\") is on the same visual line as `char - 1`\n  // and after `char - 1` in writing order of `char - 1`\n  // A cursor Pos(line, char, \"after\") is on the same visual line as `char`\n  // and before `char` in writing order of `char`\n  // Examples (upper-case letters are RTL, lower-case are LTR):\n  //     Pos(0, 1, ...)\n  //     before   after\n  // ab     a|b     a|b\n  // aB     a|B     aB|\n  // Ab     |Ab     A|b\n  // AB     B|A     B|A\n  // Every position after the last character on a line is considered to stick\n  // to the last character on the line.\n  function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {\n    lineObj = lineObj || getLine(cm.doc, pos.line);\n    if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj); }\n    function get(ch, right) {\n      var m = measureCharPrepared(cm, preparedMeasure, ch, right ? \"right\" : \"left\", varHeight);\n      if (right) { m.left = m.right; } else { m.right = m.left; }\n      return intoCoordSystem(cm, lineObj, m, context)\n    }\n    var order = getOrder(lineObj, cm.doc.direction), ch = pos.ch, sticky = pos.sticky;\n    if (ch >= lineObj.text.length) {\n      ch = lineObj.text.length;\n      sticky = \"before\";\n    } else if (ch <= 0) {\n      ch = 0;\n      sticky = \"after\";\n    }\n    if (!order) { return get(sticky == \"before\" ? ch - 1 : ch, sticky == \"before\") }\n\n    function getBidi(ch, partPos, invert) {\n      var part = order[partPos], right = part.level == 1;\n      return get(invert ? ch - 1 : ch, right != invert)\n    }\n    var partPos = getBidiPartAt(order, ch, sticky);\n    var other = bidiOther;\n    var val = getBidi(ch, partPos, sticky == \"before\");\n    if (other != null) { val.other = getBidi(ch, other, sticky != \"before\"); }\n    return val\n  }\n\n  // Used to cheaply estimate the coordinates for a position. Used for\n  // intermediate scroll updates.\n  function estimateCoords(cm, pos) {\n    var left = 0;\n    pos = clipPos(cm.doc, pos);\n    if (!cm.options.lineWrapping) { left = charWidth(cm.display) * pos.ch; }\n    var lineObj = getLine(cm.doc, pos.line);\n    var top = heightAtLine(lineObj) + paddingTop(cm.display);\n    return {left: left, right: left, top: top, bottom: top + lineObj.height}\n  }\n\n  // Positions returned by coordsChar contain some extra information.\n  // xRel is the relative x position of the input coordinates compared\n  // to the found position (so xRel > 0 means the coordinates are to\n  // the right of the character position, for example). When outside\n  // is true, that means the coordinates lie outside the line's\n  // vertical range.\n  function PosWithInfo(line, ch, sticky, outside, xRel) {\n    var pos = Pos(line, ch, sticky);\n    pos.xRel = xRel;\n    if (outside) { pos.outside = outside; }\n    return pos\n  }\n\n  // Compute the character position closest to the given coordinates.\n  // Input must be lineSpace-local (\"div\" coordinate system).\n  function coordsChar(cm, x, y) {\n    var doc = cm.doc;\n    y += cm.display.viewOffset;\n    if (y < 0) { return PosWithInfo(doc.first, 0, null, -1, -1) }\n    var lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1;\n    if (lineN > last)\n      { return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, null, 1, 1) }\n    if (x < 0) { x = 0; }\n\n    var lineObj = getLine(doc, lineN);\n    for (;;) {\n      var found = coordsCharInner(cm, lineObj, lineN, x, y);\n      var collapsed = collapsedSpanAround(lineObj, found.ch + (found.xRel > 0 || found.outside > 0 ? 1 : 0));\n      if (!collapsed) { return found }\n      var rangeEnd = collapsed.find(1);\n      if (rangeEnd.line == lineN) { return rangeEnd }\n      lineObj = getLine(doc, lineN = rangeEnd.line);\n    }\n  }\n\n  function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {\n    y -= widgetTopHeight(lineObj);\n    var end = lineObj.text.length;\n    var begin = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch - 1).bottom <= y; }, end, 0);\n    end = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch).top > y; }, begin, end);\n    return {begin: begin, end: end}\n  }\n\n  function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {\n    if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj); }\n    var targetTop = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, target), \"line\").top;\n    return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop)\n  }\n\n  // Returns true if the given side of a box is after the given\n  // coordinates, in top-to-bottom, left-to-right order.\n  function boxIsAfter(box, x, y, left) {\n    return box.bottom <= y ? false : box.top > y ? true : (left ? box.left : box.right) > x\n  }\n\n  function coordsCharInner(cm, lineObj, lineNo, x, y) {\n    // Move y into line-local coordinate space\n    y -= heightAtLine(lineObj);\n    var preparedMeasure = prepareMeasureForLine(cm, lineObj);\n    // When directly calling `measureCharPrepared`, we have to adjust\n    // for the widgets at this line.\n    var widgetHeight = widgetTopHeight(lineObj);\n    var begin = 0, end = lineObj.text.length, ltr = true;\n\n    var order = getOrder(lineObj, cm.doc.direction);\n    // If the line isn't plain left-to-right text, first figure out\n    // which bidi section the coordinates fall into.\n    if (order) {\n      var part = (cm.options.lineWrapping ? coordsBidiPartWrapped : coordsBidiPart)\n                   (cm, lineObj, lineNo, preparedMeasure, order, x, y);\n      ltr = part.level != 1;\n      // The awkward -1 offsets are needed because findFirst (called\n      // on these below) will treat its first bound as inclusive,\n      // second as exclusive, but we want to actually address the\n      // characters in the part's range\n      begin = ltr ? part.from : part.to - 1;\n      end = ltr ? part.to : part.from - 1;\n    }\n\n    // A binary search to find the first character whose bounding box\n    // starts after the coordinates. If we run across any whose box wrap\n    // the coordinates, store that.\n    var chAround = null, boxAround = null;\n    var ch = findFirst(function (ch) {\n      var box = measureCharPrepared(cm, preparedMeasure, ch);\n      box.top += widgetHeight; box.bottom += widgetHeight;\n      if (!boxIsAfter(box, x, y, false)) { return false }\n      if (box.top <= y && box.left <= x) {\n        chAround = ch;\n        boxAround = box;\n      }\n      return true\n    }, begin, end);\n\n    var baseX, sticky, outside = false;\n    // If a box around the coordinates was found, use that\n    if (boxAround) {\n      // Distinguish coordinates nearer to the left or right side of the box\n      var atLeft = x - boxAround.left < boxAround.right - x, atStart = atLeft == ltr;\n      ch = chAround + (atStart ? 0 : 1);\n      sticky = atStart ? \"after\" : \"before\";\n      baseX = atLeft ? boxAround.left : boxAround.right;\n    } else {\n      // (Adjust for extended bound, if necessary.)\n      if (!ltr && (ch == end || ch == begin)) { ch++; }\n      // To determine which side to associate with, get the box to the\n      // left of the character and compare it's vertical position to the\n      // coordinates\n      sticky = ch == 0 ? \"after\" : ch == lineObj.text.length ? \"before\" :\n        (measureCharPrepared(cm, preparedMeasure, ch - (ltr ? 1 : 0)).bottom + widgetHeight <= y) == ltr ?\n        \"after\" : \"before\";\n      // Now get accurate coordinates for this place, in order to get a\n      // base X position\n      var coords = cursorCoords(cm, Pos(lineNo, ch, sticky), \"line\", lineObj, preparedMeasure);\n      baseX = coords.left;\n      outside = y < coords.top ? -1 : y >= coords.bottom ? 1 : 0;\n    }\n\n    ch = skipExtendingChars(lineObj.text, ch, 1);\n    return PosWithInfo(lineNo, ch, sticky, outside, x - baseX)\n  }\n\n  function coordsBidiPart(cm, lineObj, lineNo, preparedMeasure, order, x, y) {\n    // Bidi parts are sorted left-to-right, and in a non-line-wrapping\n    // situation, we can take this ordering to correspond to the visual\n    // ordering. This finds the first part whose end is after the given\n    // coordinates.\n    var index = findFirst(function (i) {\n      var part = order[i], ltr = part.level != 1;\n      return boxIsAfter(cursorCoords(cm, Pos(lineNo, ltr ? part.to : part.from, ltr ? \"before\" : \"after\"),\n                                     \"line\", lineObj, preparedMeasure), x, y, true)\n    }, 0, order.length - 1);\n    var part = order[index];\n    // If this isn't the first part, the part's start is also after\n    // the coordinates, and the coordinates aren't on the same line as\n    // that start, move one part back.\n    if (index > 0) {\n      var ltr = part.level != 1;\n      var start = cursorCoords(cm, Pos(lineNo, ltr ? part.from : part.to, ltr ? \"after\" : \"before\"),\n                               \"line\", lineObj, preparedMeasure);\n      if (boxIsAfter(start, x, y, true) && start.top > y)\n        { part = order[index - 1]; }\n    }\n    return part\n  }\n\n  function coordsBidiPartWrapped(cm, lineObj, _lineNo, preparedMeasure, order, x, y) {\n    // In a wrapped line, rtl text on wrapping boundaries can do things\n    // that don't correspond to the ordering in our `order` array at\n    // all, so a binary search doesn't work, and we want to return a\n    // part that only spans one line so that the binary search in\n    // coordsCharInner is safe. As such, we first find the extent of the\n    // wrapped line, and then do a flat search in which we discard any\n    // spans that aren't on the line.\n    var ref = wrappedLineExtent(cm, lineObj, preparedMeasure, y);\n    var begin = ref.begin;\n    var end = ref.end;\n    if (/\\s/.test(lineObj.text.charAt(end - 1))) { end--; }\n    var part = null, closestDist = null;\n    for (var i = 0; i < order.length; i++) {\n      var p = order[i];\n      if (p.from >= end || p.to <= begin) { continue }\n      var ltr = p.level != 1;\n      var endX = measureCharPrepared(cm, preparedMeasure, ltr ? Math.min(end, p.to) - 1 : Math.max(begin, p.from)).right;\n      // Weigh against spans ending before this, so that they are only\n      // picked if nothing ends after\n      var dist = endX < x ? x - endX + 1e9 : endX - x;\n      if (!part || closestDist > dist) {\n        part = p;\n        closestDist = dist;\n      }\n    }\n    if (!part) { part = order[order.length - 1]; }\n    // Clip the part to the wrapped line.\n    if (part.from < begin) { part = {from: begin, to: part.to, level: part.level}; }\n    if (part.to > end) { part = {from: part.from, to: end, level: part.level}; }\n    return part\n  }\n\n  var measureText;\n  // Compute the default text height.\n  function textHeight(display) {\n    if (display.cachedTextHeight != null) { return display.cachedTextHeight }\n    if (measureText == null) {\n      measureText = elt(\"pre\", null, \"CodeMirror-line-like\");\n      // Measure a bunch of lines, for browsers that compute\n      // fractional heights.\n      for (var i = 0; i < 49; ++i) {\n        measureText.appendChild(document.createTextNode(\"x\"));\n        measureText.appendChild(elt(\"br\"));\n      }\n      measureText.appendChild(document.createTextNode(\"x\"));\n    }\n    removeChildrenAndAdd(display.measure, measureText);\n    var height = measureText.offsetHeight / 50;\n    if (height > 3) { display.cachedTextHeight = height; }\n    removeChildren(display.measure);\n    return height || 1\n  }\n\n  // Compute the default character width.\n  function charWidth(display) {\n    if (display.cachedCharWidth != null) { return display.cachedCharWidth }\n    var anchor = elt(\"span\", \"xxxxxxxxxx\");\n    var pre = elt(\"pre\", [anchor], \"CodeMirror-line-like\");\n    removeChildrenAndAdd(display.measure, pre);\n    var rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10;\n    if (width > 2) { display.cachedCharWidth = width; }\n    return width || 10\n  }\n\n  // Do a bulk-read of the DOM positions and sizes needed to draw the\n  // view, so that we don't interleave reading and writing to the DOM.\n  function getDimensions(cm) {\n    var d = cm.display, left = {}, width = {};\n    var gutterLeft = d.gutters.clientLeft;\n    for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {\n      var id = cm.display.gutterSpecs[i].className;\n      left[id] = n.offsetLeft + n.clientLeft + gutterLeft;\n      width[id] = n.clientWidth;\n    }\n    return {fixedPos: compensateForHScroll(d),\n            gutterTotalWidth: d.gutters.offsetWidth,\n            gutterLeft: left,\n            gutterWidth: width,\n            wrapperWidth: d.wrapper.clientWidth}\n  }\n\n  // Computes display.scroller.scrollLeft + display.gutters.offsetWidth,\n  // but using getBoundingClientRect to get a sub-pixel-accurate\n  // result.\n  function compensateForHScroll(display) {\n    return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left\n  }\n\n  // Returns a function that estimates the height of a line, to use as\n  // first approximation until the line becomes visible (and is thus\n  // properly measurable).\n  function estimateHeight(cm) {\n    var th = textHeight(cm.display), wrapping = cm.options.lineWrapping;\n    var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);\n    return function (line) {\n      if (lineIsHidden(cm.doc, line)) { return 0 }\n\n      var widgetsHeight = 0;\n      if (line.widgets) { for (var i = 0; i < line.widgets.length; i++) {\n        if (line.widgets[i].height) { widgetsHeight += line.widgets[i].height; }\n      } }\n\n      if (wrapping)\n        { return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th }\n      else\n        { return widgetsHeight + th }\n    }\n  }\n\n  function estimateLineHeights(cm) {\n    var doc = cm.doc, est = estimateHeight(cm);\n    doc.iter(function (line) {\n      var estHeight = est(line);\n      if (estHeight != line.height) { updateLineHeight(line, estHeight); }\n    });\n  }\n\n  // Given a mouse event, find the corresponding position. If liberal\n  // is false, it checks whether a gutter or scrollbar was clicked,\n  // and returns null if it was. forRect is used by rectangular\n  // selections, and tries to estimate a character position even for\n  // coordinates beyond the right of the text.\n  function posFromMouse(cm, e, liberal, forRect) {\n    var display = cm.display;\n    if (!liberal && e_target(e).getAttribute(\"cm-not-content\") == \"true\") { return null }\n\n    var x, y, space = display.lineSpace.getBoundingClientRect();\n    // Fails unpredictably on IE[67] when mouse is dragged around quickly.\n    try { x = e.clientX - space.left; y = e.clientY - space.top; }\n    catch (e$1) { return null }\n    var coords = coordsChar(cm, x, y), line;\n    if (forRect && coords.xRel > 0 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {\n      var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;\n      coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff));\n    }\n    return coords\n  }\n\n  // Find the view element corresponding to a given line. Return null\n  // when the line isn't visible.\n  function findViewIndex(cm, n) {\n    if (n >= cm.display.viewTo) { return null }\n    n -= cm.display.viewFrom;\n    if (n < 0) { return null }\n    var view = cm.display.view;\n    for (var i = 0; i < view.length; i++) {\n      n -= view[i].size;\n      if (n < 0) { return i }\n    }\n  }\n\n  // Updates the display.view data structure for a given change to the\n  // document. From and to are in pre-change coordinates. Lendiff is\n  // the amount of lines added or subtracted by the change. This is\n  // used for changes that span multiple lines, or change the way\n  // lines are divided into visual lines. regLineChange (below)\n  // registers single-line changes.\n  function regChange(cm, from, to, lendiff) {\n    if (from == null) { from = cm.doc.first; }\n    if (to == null) { to = cm.doc.first + cm.doc.size; }\n    if (!lendiff) { lendiff = 0; }\n\n    var display = cm.display;\n    if (lendiff && to < display.viewTo &&\n        (display.updateLineNumbers == null || display.updateLineNumbers > from))\n      { display.updateLineNumbers = from; }\n\n    cm.curOp.viewChanged = true;\n\n    if (from >= display.viewTo) { // Change after\n      if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo)\n        { resetView(cm); }\n    } else if (to <= display.viewFrom) { // Change before\n      if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {\n        resetView(cm);\n      } else {\n        display.viewFrom += lendiff;\n        display.viewTo += lendiff;\n      }\n    } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap\n      resetView(cm);\n    } else if (from <= display.viewFrom) { // Top overlap\n      var cut = viewCuttingPoint(cm, to, to + lendiff, 1);\n      if (cut) {\n        display.view = display.view.slice(cut.index);\n        display.viewFrom = cut.lineN;\n        display.viewTo += lendiff;\n      } else {\n        resetView(cm);\n      }\n    } else if (to >= display.viewTo) { // Bottom overlap\n      var cut$1 = viewCuttingPoint(cm, from, from, -1);\n      if (cut$1) {\n        display.view = display.view.slice(0, cut$1.index);\n        display.viewTo = cut$1.lineN;\n      } else {\n        resetView(cm);\n      }\n    } else { // Gap in the middle\n      var cutTop = viewCuttingPoint(cm, from, from, -1);\n      var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);\n      if (cutTop && cutBot) {\n        display.view = display.view.slice(0, cutTop.index)\n          .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))\n          .concat(display.view.slice(cutBot.index));\n        display.viewTo += lendiff;\n      } else {\n        resetView(cm);\n      }\n    }\n\n    var ext = display.externalMeasured;\n    if (ext) {\n      if (to < ext.lineN)\n        { ext.lineN += lendiff; }\n      else if (from < ext.lineN + ext.size)\n        { display.externalMeasured = null; }\n    }\n  }\n\n  // Register a change to a single line. Type must be one of \"text\",\n  // \"gutter\", \"class\", \"widget\"\n  function regLineChange(cm, line, type) {\n    cm.curOp.viewChanged = true;\n    var display = cm.display, ext = cm.display.externalMeasured;\n    if (ext && line >= ext.lineN && line < ext.lineN + ext.size)\n      { display.externalMeasured = null; }\n\n    if (line < display.viewFrom || line >= display.viewTo) { return }\n    var lineView = display.view[findViewIndex(cm, line)];\n    if (lineView.node == null) { return }\n    var arr = lineView.changes || (lineView.changes = []);\n    if (indexOf(arr, type) == -1) { arr.push(type); }\n  }\n\n  // Clear the view.\n  function resetView(cm) {\n    cm.display.viewFrom = cm.display.viewTo = cm.doc.first;\n    cm.display.view = [];\n    cm.display.viewOffset = 0;\n  }\n\n  function viewCuttingPoint(cm, oldN, newN, dir) {\n    var index = findViewIndex(cm, oldN), diff, view = cm.display.view;\n    if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size)\n      { return {index: index, lineN: newN} }\n    var n = cm.display.viewFrom;\n    for (var i = 0; i < index; i++)\n      { n += view[i].size; }\n    if (n != oldN) {\n      if (dir > 0) {\n        if (index == view.length - 1) { return null }\n        diff = (n + view[index].size) - oldN;\n        index++;\n      } else {\n        diff = n - oldN;\n      }\n      oldN += diff; newN += diff;\n    }\n    while (visualLineNo(cm.doc, newN) != newN) {\n      if (index == (dir < 0 ? 0 : view.length - 1)) { return null }\n      newN += dir * view[index - (dir < 0 ? 1 : 0)].size;\n      index += dir;\n    }\n    return {index: index, lineN: newN}\n  }\n\n  // Force the view to cover a given range, adding empty view element\n  // or clipping off existing ones as needed.\n  function adjustView(cm, from, to) {\n    var display = cm.display, view = display.view;\n    if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {\n      display.view = buildViewArray(cm, from, to);\n      display.viewFrom = from;\n    } else {\n      if (display.viewFrom > from)\n        { display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view); }\n      else if (display.viewFrom < from)\n        { display.view = display.view.slice(findViewIndex(cm, from)); }\n      display.viewFrom = from;\n      if (display.viewTo < to)\n        { display.view = display.view.concat(buildViewArray(cm, display.viewTo, to)); }\n      else if (display.viewTo > to)\n        { display.view = display.view.slice(0, findViewIndex(cm, to)); }\n    }\n    display.viewTo = to;\n  }\n\n  // Count the number of lines in the view whose DOM representation is\n  // out of date (or nonexistent).\n  function countDirtyView(cm) {\n    var view = cm.display.view, dirty = 0;\n    for (var i = 0; i < view.length; i++) {\n      var lineView = view[i];\n      if (!lineView.hidden && (!lineView.node || lineView.changes)) { ++dirty; }\n    }\n    return dirty\n  }\n\n  function updateSelection(cm) {\n    cm.display.input.showSelection(cm.display.input.prepareSelection());\n  }\n\n  function prepareSelection(cm, primary) {\n    if ( primary === void 0 ) primary = true;\n\n    var doc = cm.doc, result = {};\n    var curFragment = result.cursors = document.createDocumentFragment();\n    var selFragment = result.selection = document.createDocumentFragment();\n\n    for (var i = 0; i < doc.sel.ranges.length; i++) {\n      if (!primary && i == doc.sel.primIndex) { continue }\n      var range = doc.sel.ranges[i];\n      if (range.from().line >= cm.display.viewTo || range.to().line < cm.display.viewFrom) { continue }\n      var collapsed = range.empty();\n      if (collapsed || cm.options.showCursorWhenSelecting)\n        { drawSelectionCursor(cm, range.head, curFragment); }\n      if (!collapsed)\n        { drawSelectionRange(cm, range, selFragment); }\n    }\n    return result\n  }\n\n  // Draws a cursor for the given range\n  function drawSelectionCursor(cm, head, output) {\n    var pos = cursorCoords(cm, head, \"div\", null, null, !cm.options.singleCursorHeightPerLine);\n\n    var cursor = output.appendChild(elt(\"div\", \"\\u00a0\", \"CodeMirror-cursor\"));\n    cursor.style.left = pos.left + \"px\";\n    cursor.style.top = pos.top + \"px\";\n    cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + \"px\";\n\n    if (pos.other) {\n      // Secondary cursor, shown when on a 'jump' in bi-directional text\n      var otherCursor = output.appendChild(elt(\"div\", \"\\u00a0\", \"CodeMirror-cursor CodeMirror-secondarycursor\"));\n      otherCursor.style.display = \"\";\n      otherCursor.style.left = pos.other.left + \"px\";\n      otherCursor.style.top = pos.other.top + \"px\";\n      otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + \"px\";\n    }\n  }\n\n  function cmpCoords(a, b) { return a.top - b.top || a.left - b.left }\n\n  // Draws the given range as a highlighted selection\n  function drawSelectionRange(cm, range, output) {\n    var display = cm.display, doc = cm.doc;\n    var fragment = document.createDocumentFragment();\n    var padding = paddingH(cm.display), leftSide = padding.left;\n    var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right;\n    var docLTR = doc.direction == \"ltr\";\n\n    function add(left, top, width, bottom) {\n      if (top < 0) { top = 0; }\n      top = Math.round(top);\n      bottom = Math.round(bottom);\n      fragment.appendChild(elt(\"div\", null, \"CodeMirror-selected\", (\"position: absolute; left: \" + left + \"px;\\n                             top: \" + top + \"px; width: \" + (width == null ? rightSide - left : width) + \"px;\\n                             height: \" + (bottom - top) + \"px\")));\n    }\n\n    function drawForLine(line, fromArg, toArg) {\n      var lineObj = getLine(doc, line);\n      var lineLen = lineObj.text.length;\n      var start, end;\n      function coords(ch, bias) {\n        return charCoords(cm, Pos(line, ch), \"div\", lineObj, bias)\n      }\n\n      function wrapX(pos, dir, side) {\n        var extent = wrappedLineExtentChar(cm, lineObj, null, pos);\n        var prop = (dir == \"ltr\") == (side == \"after\") ? \"left\" : \"right\";\n        var ch = side == \"after\" ? extent.begin : extent.end - (/\\s/.test(lineObj.text.charAt(extent.end - 1)) ? 2 : 1);\n        return coords(ch, prop)[prop]\n      }\n\n      var order = getOrder(lineObj, doc.direction);\n      iterateBidiSections(order, fromArg || 0, toArg == null ? lineLen : toArg, function (from, to, dir, i) {\n        var ltr = dir == \"ltr\";\n        var fromPos = coords(from, ltr ? \"left\" : \"right\");\n        var toPos = coords(to - 1, ltr ? \"right\" : \"left\");\n\n        var openStart = fromArg == null && from == 0, openEnd = toArg == null && to == lineLen;\n        var first = i == 0, last = !order || i == order.length - 1;\n        if (toPos.top - fromPos.top <= 3) { // Single line\n          var openLeft = (docLTR ? openStart : openEnd) && first;\n          var openRight = (docLTR ? openEnd : openStart) && last;\n          var left = openLeft ? leftSide : (ltr ? fromPos : toPos).left;\n          var right = openRight ? rightSide : (ltr ? toPos : fromPos).right;\n          add(left, fromPos.top, right - left, fromPos.bottom);\n        } else { // Multiple lines\n          var topLeft, topRight, botLeft, botRight;\n          if (ltr) {\n            topLeft = docLTR && openStart && first ? leftSide : fromPos.left;\n            topRight = docLTR ? rightSide : wrapX(from, dir, \"before\");\n            botLeft = docLTR ? leftSide : wrapX(to, dir, \"after\");\n            botRight = docLTR && openEnd && last ? rightSide : toPos.right;\n          } else {\n            topLeft = !docLTR ? leftSide : wrapX(from, dir, \"before\");\n            topRight = !docLTR && openStart && first ? rightSide : fromPos.right;\n            botLeft = !docLTR && openEnd && last ? leftSide : toPos.left;\n            botRight = !docLTR ? rightSide : wrapX(to, dir, \"after\");\n          }\n          add(topLeft, fromPos.top, topRight - topLeft, fromPos.bottom);\n          if (fromPos.bottom < toPos.top) { add(leftSide, fromPos.bottom, null, toPos.top); }\n          add(botLeft, toPos.top, botRight - botLeft, toPos.bottom);\n        }\n\n        if (!start || cmpCoords(fromPos, start) < 0) { start = fromPos; }\n        if (cmpCoords(toPos, start) < 0) { start = toPos; }\n        if (!end || cmpCoords(fromPos, end) < 0) { end = fromPos; }\n        if (cmpCoords(toPos, end) < 0) { end = toPos; }\n      });\n      return {start: start, end: end}\n    }\n\n    var sFrom = range.from(), sTo = range.to();\n    if (sFrom.line == sTo.line) {\n      drawForLine(sFrom.line, sFrom.ch, sTo.ch);\n    } else {\n      var fromLine = getLine(doc, sFrom.line), toLine = getLine(doc, sTo.line);\n      var singleVLine = visualLine(fromLine) == visualLine(toLine);\n      var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end;\n      var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start;\n      if (singleVLine) {\n        if (leftEnd.top < rightStart.top - 2) {\n          add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);\n          add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);\n        } else {\n          add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);\n        }\n      }\n      if (leftEnd.bottom < rightStart.top)\n        { add(leftSide, leftEnd.bottom, null, rightStart.top); }\n    }\n\n    output.appendChild(fragment);\n  }\n\n  // Cursor-blinking\n  function restartBlink(cm) {\n    if (!cm.state.focused) { return }\n    var display = cm.display;\n    clearInterval(display.blinker);\n    var on = true;\n    display.cursorDiv.style.visibility = \"\";\n    if (cm.options.cursorBlinkRate > 0)\n      { display.blinker = setInterval(function () {\n        if (!cm.hasFocus()) { onBlur(cm); }\n        display.cursorDiv.style.visibility = (on = !on) ? \"\" : \"hidden\";\n      }, cm.options.cursorBlinkRate); }\n    else if (cm.options.cursorBlinkRate < 0)\n      { display.cursorDiv.style.visibility = \"hidden\"; }\n  }\n\n  function ensureFocus(cm) {\n    if (!cm.hasFocus()) {\n      cm.display.input.focus();\n      if (!cm.state.focused) { onFocus(cm); }\n    }\n  }\n\n  function delayBlurEvent(cm) {\n    cm.state.delayingBlurEvent = true;\n    setTimeout(function () { if (cm.state.delayingBlurEvent) {\n      cm.state.delayingBlurEvent = false;\n      if (cm.state.focused) { onBlur(cm); }\n    } }, 100);\n  }\n\n  function onFocus(cm, e) {\n    if (cm.state.delayingBlurEvent && !cm.state.draggingText) { cm.state.delayingBlurEvent = false; }\n\n    if (cm.options.readOnly == \"nocursor\") { return }\n    if (!cm.state.focused) {\n      signal(cm, \"focus\", cm, e);\n      cm.state.focused = true;\n      addClass(cm.display.wrapper, \"CodeMirror-focused\");\n      // This test prevents this from firing when a context\n      // menu is closed (since the input reset would kill the\n      // select-all detection hack)\n      if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {\n        cm.display.input.reset();\n        if (webkit) { setTimeout(function () { return cm.display.input.reset(true); }, 20); } // Issue #1730\n      }\n      cm.display.input.receivedFocus();\n    }\n    restartBlink(cm);\n  }\n  function onBlur(cm, e) {\n    if (cm.state.delayingBlurEvent) { return }\n\n    if (cm.state.focused) {\n      signal(cm, \"blur\", cm, e);\n      cm.state.focused = false;\n      rmClass(cm.display.wrapper, \"CodeMirror-focused\");\n    }\n    clearInterval(cm.display.blinker);\n    setTimeout(function () { if (!cm.state.focused) { cm.display.shift = false; } }, 150);\n  }\n\n  // Read the actual heights of the rendered lines, and update their\n  // stored heights to match.\n  function updateHeightsInViewport(cm) {\n    var display = cm.display;\n    var prevBottom = display.lineDiv.offsetTop;\n    for (var i = 0; i < display.view.length; i++) {\n      var cur = display.view[i], wrapping = cm.options.lineWrapping;\n      var height = (void 0), width = 0;\n      if (cur.hidden) { continue }\n      if (ie && ie_version < 8) {\n        var bot = cur.node.offsetTop + cur.node.offsetHeight;\n        height = bot - prevBottom;\n        prevBottom = bot;\n      } else {\n        var box = cur.node.getBoundingClientRect();\n        height = box.bottom - box.top;\n        // Check that lines don't extend past the right of the current\n        // editor width\n        if (!wrapping && cur.text.firstChild)\n          { width = cur.text.firstChild.getBoundingClientRect().right - box.left - 1; }\n      }\n      var diff = cur.line.height - height;\n      if (diff > .005 || diff < -.005) {\n        updateLineHeight(cur.line, height);\n        updateWidgetHeight(cur.line);\n        if (cur.rest) { for (var j = 0; j < cur.rest.length; j++)\n          { updateWidgetHeight(cur.rest[j]); } }\n      }\n      if (width > cm.display.sizerWidth) {\n        var chWidth = Math.ceil(width / charWidth(cm.display));\n        if (chWidth > cm.display.maxLineLength) {\n          cm.display.maxLineLength = chWidth;\n          cm.display.maxLine = cur.line;\n          cm.display.maxLineChanged = true;\n        }\n      }\n    }\n  }\n\n  // Read and store the height of line widgets associated with the\n  // given line.\n  function updateWidgetHeight(line) {\n    if (line.widgets) { for (var i = 0; i < line.widgets.length; ++i) {\n      var w = line.widgets[i], parent = w.node.parentNode;\n      if (parent) { w.height = parent.offsetHeight; }\n    } }\n  }\n\n  // Compute the lines that are visible in a given viewport (defaults\n  // the the current scroll position). viewport may contain top,\n  // height, and ensure (see op.scrollToPos) properties.\n  function visibleLines(display, doc, viewport) {\n    var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop;\n    top = Math.floor(top - paddingTop(display));\n    var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight;\n\n    var from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom);\n    // Ensure is a {from: {line, ch}, to: {line, ch}} object, and\n    // forces those lines into the viewport (if possible).\n    if (viewport && viewport.ensure) {\n      var ensureFrom = viewport.ensure.from.line, ensureTo = viewport.ensure.to.line;\n      if (ensureFrom < from) {\n        from = ensureFrom;\n        to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight);\n      } else if (Math.min(ensureTo, doc.lastLine()) >= to) {\n        from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight);\n        to = ensureTo;\n      }\n    }\n    return {from: from, to: Math.max(to, from + 1)}\n  }\n\n  // SCROLLING THINGS INTO VIEW\n\n  // If an editor sits on the top or bottom of the window, partially\n  // scrolled out of view, this ensures that the cursor is visible.\n  function maybeScrollWindow(cm, rect) {\n    if (signalDOMEvent(cm, \"scrollCursorIntoView\")) { return }\n\n    var display = cm.display, box = display.sizer.getBoundingClientRect(), doScroll = null;\n    if (rect.top + box.top < 0) { doScroll = true; }\n    else if (rect.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) { doScroll = false; }\n    if (doScroll != null && !phantom) {\n      var scrollNode = elt(\"div\", \"\\u200b\", null, (\"position: absolute;\\n                         top: \" + (rect.top - display.viewOffset - paddingTop(cm.display)) + \"px;\\n                         height: \" + (rect.bottom - rect.top + scrollGap(cm) + display.barHeight) + \"px;\\n                         left: \" + (rect.left) + \"px; width: \" + (Math.max(2, rect.right - rect.left)) + \"px;\"));\n      cm.display.lineSpace.appendChild(scrollNode);\n      scrollNode.scrollIntoView(doScroll);\n      cm.display.lineSpace.removeChild(scrollNode);\n    }\n  }\n\n  // Scroll a given position into view (immediately), verifying that\n  // it actually became visible (as line heights are accurately\n  // measured, the position of something may 'drift' during drawing).\n  function scrollPosIntoView(cm, pos, end, margin) {\n    if (margin == null) { margin = 0; }\n    var rect;\n    if (!cm.options.lineWrapping && pos == end) {\n      // Set pos and end to the cursor positions around the character pos sticks to\n      // If pos.sticky == \"before\", that is around pos.ch - 1, otherwise around pos.ch\n      // If pos == Pos(_, 0, \"before\"), pos and end are unchanged\n      end = pos.sticky == \"before\" ? Pos(pos.line, pos.ch + 1, \"before\") : pos;\n      pos = pos.ch ? Pos(pos.line, pos.sticky == \"before\" ? pos.ch - 1 : pos.ch, \"after\") : pos;\n    }\n    for (var limit = 0; limit < 5; limit++) {\n      var changed = false;\n      var coords = cursorCoords(cm, pos);\n      var endCoords = !end || end == pos ? coords : cursorCoords(cm, end);\n      rect = {left: Math.min(coords.left, endCoords.left),\n              top: Math.min(coords.top, endCoords.top) - margin,\n              right: Math.max(coords.left, endCoords.left),\n              bottom: Math.max(coords.bottom, endCoords.bottom) + margin};\n      var scrollPos = calculateScrollPos(cm, rect);\n      var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft;\n      if (scrollPos.scrollTop != null) {\n        updateScrollTop(cm, scrollPos.scrollTop);\n        if (Math.abs(cm.doc.scrollTop - startTop) > 1) { changed = true; }\n      }\n      if (scrollPos.scrollLeft != null) {\n        setScrollLeft(cm, scrollPos.scrollLeft);\n        if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) { changed = true; }\n      }\n      if (!changed) { break }\n    }\n    return rect\n  }\n\n  // Scroll a given set of coordinates into view (immediately).\n  function scrollIntoView(cm, rect) {\n    var scrollPos = calculateScrollPos(cm, rect);\n    if (scrollPos.scrollTop != null) { updateScrollTop(cm, scrollPos.scrollTop); }\n    if (scrollPos.scrollLeft != null) { setScrollLeft(cm, scrollPos.scrollLeft); }\n  }\n\n  // Calculate a new scroll position needed to scroll the given\n  // rectangle into view. Returns an object with scrollTop and\n  // scrollLeft properties. When these are undefined, the\n  // vertical/horizontal position does not need to be adjusted.\n  function calculateScrollPos(cm, rect) {\n    var display = cm.display, snapMargin = textHeight(cm.display);\n    if (rect.top < 0) { rect.top = 0; }\n    var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop;\n    var screen = displayHeight(cm), result = {};\n    if (rect.bottom - rect.top > screen) { rect.bottom = rect.top + screen; }\n    var docBottom = cm.doc.height + paddingVert(display);\n    var atTop = rect.top < snapMargin, atBottom = rect.bottom > docBottom - snapMargin;\n    if (rect.top < screentop) {\n      result.scrollTop = atTop ? 0 : rect.top;\n    } else if (rect.bottom > screentop + screen) {\n      var newTop = Math.min(rect.top, (atBottom ? docBottom : rect.bottom) - screen);\n      if (newTop != screentop) { result.scrollTop = newTop; }\n    }\n\n    var gutterSpace = cm.options.fixedGutter ? 0 : display.gutters.offsetWidth;\n    var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft - gutterSpace;\n    var screenw = displayWidth(cm) - display.gutters.offsetWidth;\n    var tooWide = rect.right - rect.left > screenw;\n    if (tooWide) { rect.right = rect.left + screenw; }\n    if (rect.left < 10)\n      { result.scrollLeft = 0; }\n    else if (rect.left < screenleft)\n      { result.scrollLeft = Math.max(0, rect.left + gutterSpace - (tooWide ? 0 : 10)); }\n    else if (rect.right > screenw + screenleft - 3)\n      { result.scrollLeft = rect.right + (tooWide ? 0 : 10) - screenw; }\n    return result\n  }\n\n  // Store a relative adjustment to the scroll position in the current\n  // operation (to be applied when the operation finishes).\n  function addToScrollTop(cm, top) {\n    if (top == null) { return }\n    resolveScrollToPos(cm);\n    cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top;\n  }\n\n  // Make sure that at the end of the operation the current cursor is\n  // shown.\n  function ensureCursorVisible(cm) {\n    resolveScrollToPos(cm);\n    var cur = cm.getCursor();\n    cm.curOp.scrollToPos = {from: cur, to: cur, margin: cm.options.cursorScrollMargin};\n  }\n\n  function scrollToCoords(cm, x, y) {\n    if (x != null || y != null) { resolveScrollToPos(cm); }\n    if (x != null) { cm.curOp.scrollLeft = x; }\n    if (y != null) { cm.curOp.scrollTop = y; }\n  }\n\n  function scrollToRange(cm, range) {\n    resolveScrollToPos(cm);\n    cm.curOp.scrollToPos = range;\n  }\n\n  // When an operation has its scrollToPos property set, and another\n  // scroll action is applied before the end of the operation, this\n  // 'simulates' scrolling that position into view in a cheap way, so\n  // that the effect of intermediate scroll commands is not ignored.\n  function resolveScrollToPos(cm) {\n    var range = cm.curOp.scrollToPos;\n    if (range) {\n      cm.curOp.scrollToPos = null;\n      var from = estimateCoords(cm, range.from), to = estimateCoords(cm, range.to);\n      scrollToCoordsRange(cm, from, to, range.margin);\n    }\n  }\n\n  function scrollToCoordsRange(cm, from, to, margin) {\n    var sPos = calculateScrollPos(cm, {\n      left: Math.min(from.left, to.left),\n      top: Math.min(from.top, to.top) - margin,\n      right: Math.max(from.right, to.right),\n      bottom: Math.max(from.bottom, to.bottom) + margin\n    });\n    scrollToCoords(cm, sPos.scrollLeft, sPos.scrollTop);\n  }\n\n  // Sync the scrollable area and scrollbars, ensure the viewport\n  // covers the visible area.\n  function updateScrollTop(cm, val) {\n    if (Math.abs(cm.doc.scrollTop - val) < 2) { return }\n    if (!gecko) { updateDisplaySimple(cm, {top: val}); }\n    setScrollTop(cm, val, true);\n    if (gecko) { updateDisplaySimple(cm); }\n    startWorker(cm, 100);\n  }\n\n  function setScrollTop(cm, val, forceScroll) {\n    val = Math.max(0, Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight, val));\n    if (cm.display.scroller.scrollTop == val && !forceScroll) { return }\n    cm.doc.scrollTop = val;\n    cm.display.scrollbars.setScrollTop(val);\n    if (cm.display.scroller.scrollTop != val) { cm.display.scroller.scrollTop = val; }\n  }\n\n  // Sync scroller and scrollbar, ensure the gutter elements are\n  // aligned.\n  function setScrollLeft(cm, val, isScroller, forceScroll) {\n    val = Math.max(0, Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth));\n    if ((isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) && !forceScroll) { return }\n    cm.doc.scrollLeft = val;\n    alignHorizontally(cm);\n    if (cm.display.scroller.scrollLeft != val) { cm.display.scroller.scrollLeft = val; }\n    cm.display.scrollbars.setScrollLeft(val);\n  }\n\n  // SCROLLBARS\n\n  // Prepare DOM reads needed to update the scrollbars. Done in one\n  // shot to minimize update/measure roundtrips.\n  function measureForScrollbars(cm) {\n    var d = cm.display, gutterW = d.gutters.offsetWidth;\n    var docH = Math.round(cm.doc.height + paddingVert(cm.display));\n    return {\n      clientHeight: d.scroller.clientHeight,\n      viewHeight: d.wrapper.clientHeight,\n      scrollWidth: d.scroller.scrollWidth, clientWidth: d.scroller.clientWidth,\n      viewWidth: d.wrapper.clientWidth,\n      barLeft: cm.options.fixedGutter ? gutterW : 0,\n      docHeight: docH,\n      scrollHeight: docH + scrollGap(cm) + d.barHeight,\n      nativeBarWidth: d.nativeBarWidth,\n      gutterWidth: gutterW\n    }\n  }\n\n  var NativeScrollbars = function(place, scroll, cm) {\n    this.cm = cm;\n    var vert = this.vert = elt(\"div\", [elt(\"div\", null, null, \"min-width: 1px\")], \"CodeMirror-vscrollbar\");\n    var horiz = this.horiz = elt(\"div\", [elt(\"div\", null, null, \"height: 100%; min-height: 1px\")], \"CodeMirror-hscrollbar\");\n    vert.tabIndex = horiz.tabIndex = -1;\n    place(vert); place(horiz);\n\n    on(vert, \"scroll\", function () {\n      if (vert.clientHeight) { scroll(vert.scrollTop, \"vertical\"); }\n    });\n    on(horiz, \"scroll\", function () {\n      if (horiz.clientWidth) { scroll(horiz.scrollLeft, \"horizontal\"); }\n    });\n\n    this.checkedZeroWidth = false;\n    // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).\n    if (ie && ie_version < 8) { this.horiz.style.minHeight = this.vert.style.minWidth = \"18px\"; }\n  };\n\n  NativeScrollbars.prototype.update = function (measure) {\n    var needsH = measure.scrollWidth > measure.clientWidth + 1;\n    var needsV = measure.scrollHeight > measure.clientHeight + 1;\n    var sWidth = measure.nativeBarWidth;\n\n    if (needsV) {\n      this.vert.style.display = \"block\";\n      this.vert.style.bottom = needsH ? sWidth + \"px\" : \"0\";\n      var totalHeight = measure.viewHeight - (needsH ? sWidth : 0);\n      // A bug in IE8 can cause this value to be negative, so guard it.\n      this.vert.firstChild.style.height =\n        Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + \"px\";\n    } else {\n      this.vert.style.display = \"\";\n      this.vert.firstChild.style.height = \"0\";\n    }\n\n    if (needsH) {\n      this.horiz.style.display = \"block\";\n      this.horiz.style.right = needsV ? sWidth + \"px\" : \"0\";\n      this.horiz.style.left = measure.barLeft + \"px\";\n      var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0);\n      this.horiz.firstChild.style.width =\n        Math.max(0, measure.scrollWidth - measure.clientWidth + totalWidth) + \"px\";\n    } else {\n      this.horiz.style.display = \"\";\n      this.horiz.firstChild.style.width = \"0\";\n    }\n\n    if (!this.checkedZeroWidth && measure.clientHeight > 0) {\n      if (sWidth == 0) { this.zeroWidthHack(); }\n      this.checkedZeroWidth = true;\n    }\n\n    return {right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0}\n  };\n\n  NativeScrollbars.prototype.setScrollLeft = function (pos) {\n    if (this.horiz.scrollLeft != pos) { this.horiz.scrollLeft = pos; }\n    if (this.disableHoriz) { this.enableZeroWidthBar(this.horiz, this.disableHoriz, \"horiz\"); }\n  };\n\n  NativeScrollbars.prototype.setScrollTop = function (pos) {\n    if (this.vert.scrollTop != pos) { this.vert.scrollTop = pos; }\n    if (this.disableVert) { this.enableZeroWidthBar(this.vert, this.disableVert, \"vert\"); }\n  };\n\n  NativeScrollbars.prototype.zeroWidthHack = function () {\n    var w = mac && !mac_geMountainLion ? \"12px\" : \"18px\";\n    this.horiz.style.height = this.vert.style.width = w;\n    this.horiz.style.pointerEvents = this.vert.style.pointerEvents = \"none\";\n    this.disableHoriz = new Delayed;\n    this.disableVert = new Delayed;\n  };\n\n  NativeScrollbars.prototype.enableZeroWidthBar = function (bar, delay, type) {\n    bar.style.pointerEvents = \"auto\";\n    function maybeDisable() {\n      // To find out whether the scrollbar is still visible, we\n      // check whether the element under the pixel in the bottom\n      // right corner of the scrollbar box is the scrollbar box\n      // itself (when the bar is still visible) or its filler child\n      // (when the bar is hidden). If it is still visible, we keep\n      // it enabled, if it's hidden, we disable pointer events.\n      var box = bar.getBoundingClientRect();\n      var elt = type == \"vert\" ? document.elementFromPoint(box.right - 1, (box.top + box.bottom) / 2)\n          : document.elementFromPoint((box.right + box.left) / 2, box.bottom - 1);\n      if (elt != bar) { bar.style.pointerEvents = \"none\"; }\n      else { delay.set(1000, maybeDisable); }\n    }\n    delay.set(1000, maybeDisable);\n  };\n\n  NativeScrollbars.prototype.clear = function () {\n    var parent = this.horiz.parentNode;\n    parent.removeChild(this.horiz);\n    parent.removeChild(this.vert);\n  };\n\n  var NullScrollbars = function () {};\n\n  NullScrollbars.prototype.update = function () { return {bottom: 0, right: 0} };\n  NullScrollbars.prototype.setScrollLeft = function () {};\n  NullScrollbars.prototype.setScrollTop = function () {};\n  NullScrollbars.prototype.clear = function () {};\n\n  function updateScrollbars(cm, measure) {\n    if (!measure) { measure = measureForScrollbars(cm); }\n    var startWidth = cm.display.barWidth, startHeight = cm.display.barHeight;\n    updateScrollbarsInner(cm, measure);\n    for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {\n      if (startWidth != cm.display.barWidth && cm.options.lineWrapping)\n        { updateHeightsInViewport(cm); }\n      updateScrollbarsInner(cm, measureForScrollbars(cm));\n      startWidth = cm.display.barWidth; startHeight = cm.display.barHeight;\n    }\n  }\n\n  // Re-synchronize the fake scrollbars with the actual size of the\n  // content.\n  function updateScrollbarsInner(cm, measure) {\n    var d = cm.display;\n    var sizes = d.scrollbars.update(measure);\n\n    d.sizer.style.paddingRight = (d.barWidth = sizes.right) + \"px\";\n    d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + \"px\";\n    d.heightForcer.style.borderBottom = sizes.bottom + \"px solid transparent\";\n\n    if (sizes.right && sizes.bottom) {\n      d.scrollbarFiller.style.display = \"block\";\n      d.scrollbarFiller.style.height = sizes.bottom + \"px\";\n      d.scrollbarFiller.style.width = sizes.right + \"px\";\n    } else { d.scrollbarFiller.style.display = \"\"; }\n    if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {\n      d.gutterFiller.style.display = \"block\";\n      d.gutterFiller.style.height = sizes.bottom + \"px\";\n      d.gutterFiller.style.width = measure.gutterWidth + \"px\";\n    } else { d.gutterFiller.style.display = \"\"; }\n  }\n\n  var scrollbarModel = {\"native\": NativeScrollbars, \"null\": NullScrollbars};\n\n  function initScrollbars(cm) {\n    if (cm.display.scrollbars) {\n      cm.display.scrollbars.clear();\n      if (cm.display.scrollbars.addClass)\n        { rmClass(cm.display.wrapper, cm.display.scrollbars.addClass); }\n    }\n\n    cm.display.scrollbars = new scrollbarModel[cm.options.scrollbarStyle](function (node) {\n      cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller);\n      // Prevent clicks in the scrollbars from killing focus\n      on(node, \"mousedown\", function () {\n        if (cm.state.focused) { setTimeout(function () { return cm.display.input.focus(); }, 0); }\n      });\n      node.setAttribute(\"cm-not-content\", \"true\");\n    }, function (pos, axis) {\n      if (axis == \"horizontal\") { setScrollLeft(cm, pos); }\n      else { updateScrollTop(cm, pos); }\n    }, cm);\n    if (cm.display.scrollbars.addClass)\n      { addClass(cm.display.wrapper, cm.display.scrollbars.addClass); }\n  }\n\n  // Operations are used to wrap a series of changes to the editor\n  // state in such a way that each change won't have to update the\n  // cursor and display (which would be awkward, slow, and\n  // error-prone). Instead, display updates are batched and then all\n  // combined and executed at once.\n\n  var nextOpId = 0;\n  // Start a new operation.\n  function startOperation(cm) {\n    cm.curOp = {\n      cm: cm,\n      viewChanged: false,      // Flag that indicates that lines might need to be redrawn\n      startHeight: cm.doc.height, // Used to detect need to update scrollbar\n      forceUpdate: false,      // Used to force a redraw\n      updateInput: 0,       // Whether to reset the input textarea\n      typing: false,           // Whether this reset should be careful to leave existing text (for compositing)\n      changeObjs: null,        // Accumulated changes, for firing change events\n      cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on\n      cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already\n      selectionChanged: false, // Whether the selection needs to be redrawn\n      updateMaxLine: false,    // Set when the widest line needs to be determined anew\n      scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet\n      scrollToPos: null,       // Used to scroll to a specific position\n      focus: false,\n      id: ++nextOpId,          // Unique ID\n      markArrays: null         // Used by addMarkedSpan\n    };\n    pushOperation(cm.curOp);\n  }\n\n  // Finish an operation, updating the display and signalling delayed events\n  function endOperation(cm) {\n    var op = cm.curOp;\n    if (op) { finishOperation(op, function (group) {\n      for (var i = 0; i < group.ops.length; i++)\n        { group.ops[i].cm.curOp = null; }\n      endOperations(group);\n    }); }\n  }\n\n  // The DOM updates done when an operation finishes are batched so\n  // that the minimum number of relayouts are required.\n  function endOperations(group) {\n    var ops = group.ops;\n    for (var i = 0; i < ops.length; i++) // Read DOM\n      { endOperation_R1(ops[i]); }\n    for (var i$1 = 0; i$1 < ops.length; i$1++) // Write DOM (maybe)\n      { endOperation_W1(ops[i$1]); }\n    for (var i$2 = 0; i$2 < ops.length; i$2++) // Read DOM\n      { endOperation_R2(ops[i$2]); }\n    for (var i$3 = 0; i$3 < ops.length; i$3++) // Write DOM (maybe)\n      { endOperation_W2(ops[i$3]); }\n    for (var i$4 = 0; i$4 < ops.length; i$4++) // Read DOM\n      { endOperation_finish(ops[i$4]); }\n  }\n\n  function endOperation_R1(op) {\n    var cm = op.cm, display = cm.display;\n    maybeClipScrollbars(cm);\n    if (op.updateMaxLine) { findMaxLine(cm); }\n\n    op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null ||\n      op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||\n                         op.scrollToPos.to.line >= display.viewTo) ||\n      display.maxLineChanged && cm.options.lineWrapping;\n    op.update = op.mustUpdate &&\n      new DisplayUpdate(cm, op.mustUpdate && {top: op.scrollTop, ensure: op.scrollToPos}, op.forceUpdate);\n  }\n\n  function endOperation_W1(op) {\n    op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update);\n  }\n\n  function endOperation_R2(op) {\n    var cm = op.cm, display = cm.display;\n    if (op.updatedDisplay) { updateHeightsInViewport(cm); }\n\n    op.barMeasure = measureForScrollbars(cm);\n\n    // If the max line changed since it was last measured, measure it,\n    // and ensure the document's width matches it.\n    // updateDisplay_W2 will use these properties to do the actual resizing\n    if (display.maxLineChanged && !cm.options.lineWrapping) {\n      op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;\n      cm.display.sizerWidth = op.adjustWidthTo;\n      op.barMeasure.scrollWidth =\n        Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth);\n      op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm));\n    }\n\n    if (op.updatedDisplay || op.selectionChanged)\n      { op.preparedSelection = display.input.prepareSelection(); }\n  }\n\n  function endOperation_W2(op) {\n    var cm = op.cm;\n\n    if (op.adjustWidthTo != null) {\n      cm.display.sizer.style.minWidth = op.adjustWidthTo + \"px\";\n      if (op.maxScrollLeft < cm.doc.scrollLeft)\n        { setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true); }\n      cm.display.maxLineChanged = false;\n    }\n\n    var takeFocus = op.focus && op.focus == activeElt();\n    if (op.preparedSelection)\n      { cm.display.input.showSelection(op.preparedSelection, takeFocus); }\n    if (op.updatedDisplay || op.startHeight != cm.doc.height)\n      { updateScrollbars(cm, op.barMeasure); }\n    if (op.updatedDisplay)\n      { setDocumentHeight(cm, op.barMeasure); }\n\n    if (op.selectionChanged) { restartBlink(cm); }\n\n    if (cm.state.focused && op.updateInput)\n      { cm.display.input.reset(op.typing); }\n    if (takeFocus) { ensureFocus(op.cm); }\n  }\n\n  function endOperation_finish(op) {\n    var cm = op.cm, display = cm.display, doc = cm.doc;\n\n    if (op.updatedDisplay) { postUpdateDisplay(cm, op.update); }\n\n    // Abort mouse wheel delta measurement, when scrolling explicitly\n    if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos))\n      { display.wheelStartX = display.wheelStartY = null; }\n\n    // Propagate the scroll position to the actual DOM scroller\n    if (op.scrollTop != null) { setScrollTop(cm, op.scrollTop, op.forceScroll); }\n\n    if (op.scrollLeft != null) { setScrollLeft(cm, op.scrollLeft, true, true); }\n    // If we need to scroll a specific position into view, do so.\n    if (op.scrollToPos) {\n      var rect = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),\n                                   clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin);\n      maybeScrollWindow(cm, rect);\n    }\n\n    // Fire events for markers that are hidden/unidden by editing or\n    // undoing\n    var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;\n    if (hidden) { for (var i = 0; i < hidden.length; ++i)\n      { if (!hidden[i].lines.length) { signal(hidden[i], \"hide\"); } } }\n    if (unhidden) { for (var i$1 = 0; i$1 < unhidden.length; ++i$1)\n      { if (unhidden[i$1].lines.length) { signal(unhidden[i$1], \"unhide\"); } } }\n\n    if (display.wrapper.offsetHeight)\n      { doc.scrollTop = cm.display.scroller.scrollTop; }\n\n    // Fire change events, and delayed event handlers\n    if (op.changeObjs)\n      { signal(cm, \"changes\", cm, op.changeObjs); }\n    if (op.update)\n      { op.update.finish(); }\n  }\n\n  // Run the given function in an operation\n  function runInOp(cm, f) {\n    if (cm.curOp) { return f() }\n    startOperation(cm);\n    try { return f() }\n    finally { endOperation(cm); }\n  }\n  // Wraps a function in an operation. Returns the wrapped function.\n  function operation(cm, f) {\n    return function() {\n      if (cm.curOp) { return f.apply(cm, arguments) }\n      startOperation(cm);\n      try { return f.apply(cm, arguments) }\n      finally { endOperation(cm); }\n    }\n  }\n  // Used to add methods to editor and doc instances, wrapping them in\n  // operations.\n  function methodOp(f) {\n    return function() {\n      if (this.curOp) { return f.apply(this, arguments) }\n      startOperation(this);\n      try { return f.apply(this, arguments) }\n      finally { endOperation(this); }\n    }\n  }\n  function docMethodOp(f) {\n    return function() {\n      var cm = this.cm;\n      if (!cm || cm.curOp) { return f.apply(this, arguments) }\n      startOperation(cm);\n      try { return f.apply(this, arguments) }\n      finally { endOperation(cm); }\n    }\n  }\n\n  // HIGHLIGHT WORKER\n\n  function startWorker(cm, time) {\n    if (cm.doc.highlightFrontier < cm.display.viewTo)\n      { cm.state.highlight.set(time, bind(highlightWorker, cm)); }\n  }\n\n  function highlightWorker(cm) {\n    var doc = cm.doc;\n    if (doc.highlightFrontier >= cm.display.viewTo) { return }\n    var end = +new Date + cm.options.workTime;\n    var context = getContextBefore(cm, doc.highlightFrontier);\n    var changedLines = [];\n\n    doc.iter(context.line, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function (line) {\n      if (context.line >= cm.display.viewFrom) { // Visible\n        var oldStyles = line.styles;\n        var resetState = line.text.length > cm.options.maxHighlightLength ? copyState(doc.mode, context.state) : null;\n        var highlighted = highlightLine(cm, line, context, true);\n        if (resetState) { context.state = resetState; }\n        line.styles = highlighted.styles;\n        var oldCls = line.styleClasses, newCls = highlighted.classes;\n        if (newCls) { line.styleClasses = newCls; }\n        else if (oldCls) { line.styleClasses = null; }\n        var ischange = !oldStyles || oldStyles.length != line.styles.length ||\n          oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass);\n        for (var i = 0; !ischange && i < oldStyles.length; ++i) { ischange = oldStyles[i] != line.styles[i]; }\n        if (ischange) { changedLines.push(context.line); }\n        line.stateAfter = context.save();\n        context.nextLine();\n      } else {\n        if (line.text.length <= cm.options.maxHighlightLength)\n          { processLine(cm, line.text, context); }\n        line.stateAfter = context.line % 5 == 0 ? context.save() : null;\n        context.nextLine();\n      }\n      if (+new Date > end) {\n        startWorker(cm, cm.options.workDelay);\n        return true\n      }\n    });\n    doc.highlightFrontier = context.line;\n    doc.modeFrontier = Math.max(doc.modeFrontier, context.line);\n    if (changedLines.length) { runInOp(cm, function () {\n      for (var i = 0; i < changedLines.length; i++)\n        { regLineChange(cm, changedLines[i], \"text\"); }\n    }); }\n  }\n\n  // DISPLAY DRAWING\n\n  var DisplayUpdate = function(cm, viewport, force) {\n    var display = cm.display;\n\n    this.viewport = viewport;\n    // Store some values that we'll need later (but don't want to force a relayout for)\n    this.visible = visibleLines(display, cm.doc, viewport);\n    this.editorIsHidden = !display.wrapper.offsetWidth;\n    this.wrapperHeight = display.wrapper.clientHeight;\n    this.wrapperWidth = display.wrapper.clientWidth;\n    this.oldDisplayWidth = displayWidth(cm);\n    this.force = force;\n    this.dims = getDimensions(cm);\n    this.events = [];\n  };\n\n  DisplayUpdate.prototype.signal = function (emitter, type) {\n    if (hasHandler(emitter, type))\n      { this.events.push(arguments); }\n  };\n  DisplayUpdate.prototype.finish = function () {\n    for (var i = 0; i < this.events.length; i++)\n      { signal.apply(null, this.events[i]); }\n  };\n\n  function maybeClipScrollbars(cm) {\n    var display = cm.display;\n    if (!display.scrollbarsClipped && display.scroller.offsetWidth) {\n      display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth;\n      display.heightForcer.style.height = scrollGap(cm) + \"px\";\n      display.sizer.style.marginBottom = -display.nativeBarWidth + \"px\";\n      display.sizer.style.borderRightWidth = scrollGap(cm) + \"px\";\n      display.scrollbarsClipped = true;\n    }\n  }\n\n  function selectionSnapshot(cm) {\n    if (cm.hasFocus()) { return null }\n    var active = activeElt();\n    if (!active || !contains(cm.display.lineDiv, active)) { return null }\n    var result = {activeElt: active};\n    if (window.getSelection) {\n      var sel = window.getSelection();\n      if (sel.anchorNode && sel.extend && contains(cm.display.lineDiv, sel.anchorNode)) {\n        result.anchorNode = sel.anchorNode;\n        result.anchorOffset = sel.anchorOffset;\n        result.focusNode = sel.focusNode;\n        result.focusOffset = sel.focusOffset;\n      }\n    }\n    return result\n  }\n\n  function restoreSelection(snapshot) {\n    if (!snapshot || !snapshot.activeElt || snapshot.activeElt == activeElt()) { return }\n    snapshot.activeElt.focus();\n    if (!/^(INPUT|TEXTAREA)$/.test(snapshot.activeElt.nodeName) &&\n        snapshot.anchorNode && contains(document.body, snapshot.anchorNode) && contains(document.body, snapshot.focusNode)) {\n      var sel = window.getSelection(), range = document.createRange();\n      range.setEnd(snapshot.anchorNode, snapshot.anchorOffset);\n      range.collapse(false);\n      sel.removeAllRanges();\n      sel.addRange(range);\n      sel.extend(snapshot.focusNode, snapshot.focusOffset);\n    }\n  }\n\n  // Does the actual updating of the line display. Bails out\n  // (returning false) when there is nothing to be done and forced is\n  // false.\n  function updateDisplayIfNeeded(cm, update) {\n    var display = cm.display, doc = cm.doc;\n\n    if (update.editorIsHidden) {\n      resetView(cm);\n      return false\n    }\n\n    // Bail out if the visible area is already rendered and nothing changed.\n    if (!update.force &&\n        update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&\n        (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&\n        display.renderedView == display.view && countDirtyView(cm) == 0)\n      { return false }\n\n    if (maybeUpdateLineNumberWidth(cm)) {\n      resetView(cm);\n      update.dims = getDimensions(cm);\n    }\n\n    // Compute a suitable new viewport (from & to)\n    var end = doc.first + doc.size;\n    var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first);\n    var to = Math.min(end, update.visible.to + cm.options.viewportMargin);\n    if (display.viewFrom < from && from - display.viewFrom < 20) { from = Math.max(doc.first, display.viewFrom); }\n    if (display.viewTo > to && display.viewTo - to < 20) { to = Math.min(end, display.viewTo); }\n    if (sawCollapsedSpans) {\n      from = visualLineNo(cm.doc, from);\n      to = visualLineEndNo(cm.doc, to);\n    }\n\n    var different = from != display.viewFrom || to != display.viewTo ||\n      display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth;\n    adjustView(cm, from, to);\n\n    display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom));\n    // Position the mover div to align with the current scroll position\n    cm.display.mover.style.top = display.viewOffset + \"px\";\n\n    var toUpdate = countDirtyView(cm);\n    if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&\n        (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo))\n      { return false }\n\n    // For big changes, we hide the enclosing element during the\n    // update, since that speeds up the operations on most browsers.\n    var selSnapshot = selectionSnapshot(cm);\n    if (toUpdate > 4) { display.lineDiv.style.display = \"none\"; }\n    patchDisplay(cm, display.updateLineNumbers, update.dims);\n    if (toUpdate > 4) { display.lineDiv.style.display = \"\"; }\n    display.renderedView = display.view;\n    // There might have been a widget with a focused element that got\n    // hidden or updated, if so re-focus it.\n    restoreSelection(selSnapshot);\n\n    // Prevent selection and cursors from interfering with the scroll\n    // width and height.\n    removeChildren(display.cursorDiv);\n    removeChildren(display.selectionDiv);\n    display.gutters.style.height = display.sizer.style.minHeight = 0;\n\n    if (different) {\n      display.lastWrapHeight = update.wrapperHeight;\n      display.lastWrapWidth = update.wrapperWidth;\n      startWorker(cm, 400);\n    }\n\n    display.updateLineNumbers = null;\n\n    return true\n  }\n\n  function postUpdateDisplay(cm, update) {\n    var viewport = update.viewport;\n\n    for (var first = true;; first = false) {\n      if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {\n        // Clip forced viewport to actual scrollable area.\n        if (viewport && viewport.top != null)\n          { viewport = {top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)}; }\n        // Updated line heights might result in the drawn area not\n        // actually covering the viewport. Keep looping until it does.\n        update.visible = visibleLines(cm.display, cm.doc, viewport);\n        if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo)\n          { break }\n      } else if (first) {\n        update.visible = visibleLines(cm.display, cm.doc, viewport);\n      }\n      if (!updateDisplayIfNeeded(cm, update)) { break }\n      updateHeightsInViewport(cm);\n      var barMeasure = measureForScrollbars(cm);\n      updateSelection(cm);\n      updateScrollbars(cm, barMeasure);\n      setDocumentHeight(cm, barMeasure);\n      update.force = false;\n    }\n\n    update.signal(cm, \"update\", cm);\n    if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {\n      update.signal(cm, \"viewportChange\", cm, cm.display.viewFrom, cm.display.viewTo);\n      cm.display.reportedViewFrom = cm.display.viewFrom; cm.display.reportedViewTo = cm.display.viewTo;\n    }\n  }\n\n  function updateDisplaySimple(cm, viewport) {\n    var update = new DisplayUpdate(cm, viewport);\n    if (updateDisplayIfNeeded(cm, update)) {\n      updateHeightsInViewport(cm);\n      postUpdateDisplay(cm, update);\n      var barMeasure = measureForScrollbars(cm);\n      updateSelection(cm);\n      updateScrollbars(cm, barMeasure);\n      setDocumentHeight(cm, barMeasure);\n      update.finish();\n    }\n  }\n\n  // Sync the actual display DOM structure with display.view, removing\n  // nodes for lines that are no longer in view, and creating the ones\n  // that are not there yet, and updating the ones that are out of\n  // date.\n  function patchDisplay(cm, updateNumbersFrom, dims) {\n    var display = cm.display, lineNumbers = cm.options.lineNumbers;\n    var container = display.lineDiv, cur = container.firstChild;\n\n    function rm(node) {\n      var next = node.nextSibling;\n      // Works around a throw-scroll bug in OS X Webkit\n      if (webkit && mac && cm.display.currentWheelTarget == node)\n        { node.style.display = \"none\"; }\n      else\n        { node.parentNode.removeChild(node); }\n      return next\n    }\n\n    var view = display.view, lineN = display.viewFrom;\n    // Loop over the elements in the view, syncing cur (the DOM nodes\n    // in display.lineDiv) with the view as we go.\n    for (var i = 0; i < view.length; i++) {\n      var lineView = view[i];\n      if (lineView.hidden) ; else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet\n        var node = buildLineElement(cm, lineView, lineN, dims);\n        container.insertBefore(node, cur);\n      } else { // Already drawn\n        while (cur != lineView.node) { cur = rm(cur); }\n        var updateNumber = lineNumbers && updateNumbersFrom != null &&\n          updateNumbersFrom <= lineN && lineView.lineNumber;\n        if (lineView.changes) {\n          if (indexOf(lineView.changes, \"gutter\") > -1) { updateNumber = false; }\n          updateLineForChanges(cm, lineView, lineN, dims);\n        }\n        if (updateNumber) {\n          removeChildren(lineView.lineNumber);\n          lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)));\n        }\n        cur = lineView.node.nextSibling;\n      }\n      lineN += lineView.size;\n    }\n    while (cur) { cur = rm(cur); }\n  }\n\n  function updateGutterSpace(display) {\n    var width = display.gutters.offsetWidth;\n    display.sizer.style.marginLeft = width + \"px\";\n    // Send an event to consumers responding to changes in gutter width.\n    signalLater(display, \"gutterChanged\", display);\n  }\n\n  function setDocumentHeight(cm, measure) {\n    cm.display.sizer.style.minHeight = measure.docHeight + \"px\";\n    cm.display.heightForcer.style.top = measure.docHeight + \"px\";\n    cm.display.gutters.style.height = (measure.docHeight + cm.display.barHeight + scrollGap(cm)) + \"px\";\n  }\n\n  // Re-align line numbers and gutter marks to compensate for\n  // horizontal scrolling.\n  function alignHorizontally(cm) {\n    var display = cm.display, view = display.view;\n    if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) { return }\n    var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;\n    var gutterW = display.gutters.offsetWidth, left = comp + \"px\";\n    for (var i = 0; i < view.length; i++) { if (!view[i].hidden) {\n      if (cm.options.fixedGutter) {\n        if (view[i].gutter)\n          { view[i].gutter.style.left = left; }\n        if (view[i].gutterBackground)\n          { view[i].gutterBackground.style.left = left; }\n      }\n      var align = view[i].alignable;\n      if (align) { for (var j = 0; j < align.length; j++)\n        { align[j].style.left = left; } }\n    } }\n    if (cm.options.fixedGutter)\n      { display.gutters.style.left = (comp + gutterW) + \"px\"; }\n  }\n\n  // Used to ensure that the line number gutter is still the right\n  // size for the current document size. Returns true when an update\n  // is needed.\n  function maybeUpdateLineNumberWidth(cm) {\n    if (!cm.options.lineNumbers) { return false }\n    var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;\n    if (last.length != display.lineNumChars) {\n      var test = display.measure.appendChild(elt(\"div\", [elt(\"div\", last)],\n                                                 \"CodeMirror-linenumber CodeMirror-gutter-elt\"));\n      var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;\n      display.lineGutter.style.width = \"\";\n      display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1;\n      display.lineNumWidth = display.lineNumInnerWidth + padding;\n      display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;\n      display.lineGutter.style.width = display.lineNumWidth + \"px\";\n      updateGutterSpace(cm.display);\n      return true\n    }\n    return false\n  }\n\n  function getGutters(gutters, lineNumbers) {\n    var result = [], sawLineNumbers = false;\n    for (var i = 0; i < gutters.length; i++) {\n      var name = gutters[i], style = null;\n      if (typeof name != \"string\") { style = name.style; name = name.className; }\n      if (name == \"CodeMirror-linenumbers\") {\n        if (!lineNumbers) { continue }\n        else { sawLineNumbers = true; }\n      }\n      result.push({className: name, style: style});\n    }\n    if (lineNumbers && !sawLineNumbers) { result.push({className: \"CodeMirror-linenumbers\", style: null}); }\n    return result\n  }\n\n  // Rebuild the gutter elements, ensure the margin to the left of the\n  // code matches their width.\n  function renderGutters(display) {\n    var gutters = display.gutters, specs = display.gutterSpecs;\n    removeChildren(gutters);\n    display.lineGutter = null;\n    for (var i = 0; i < specs.length; ++i) {\n      var ref = specs[i];\n      var className = ref.className;\n      var style = ref.style;\n      var gElt = gutters.appendChild(elt(\"div\", null, \"CodeMirror-gutter \" + className));\n      if (style) { gElt.style.cssText = style; }\n      if (className == \"CodeMirror-linenumbers\") {\n        display.lineGutter = gElt;\n        gElt.style.width = (display.lineNumWidth || 1) + \"px\";\n      }\n    }\n    gutters.style.display = specs.length ? \"\" : \"none\";\n    updateGutterSpace(display);\n  }\n\n  function updateGutters(cm) {\n    renderGutters(cm.display);\n    regChange(cm);\n    alignHorizontally(cm);\n  }\n\n  // The display handles the DOM integration, both for input reading\n  // and content drawing. It holds references to DOM nodes and\n  // display-related state.\n\n  function Display(place, doc, input, options) {\n    var d = this;\n    this.input = input;\n\n    // Covers bottom-right square when both scrollbars are present.\n    d.scrollbarFiller = elt(\"div\", null, \"CodeMirror-scrollbar-filler\");\n    d.scrollbarFiller.setAttribute(\"cm-not-content\", \"true\");\n    // Covers bottom of gutter when coverGutterNextToScrollbar is on\n    // and h scrollbar is present.\n    d.gutterFiller = elt(\"div\", null, \"CodeMirror-gutter-filler\");\n    d.gutterFiller.setAttribute(\"cm-not-content\", \"true\");\n    // Will contain the actual code, positioned to cover the viewport.\n    d.lineDiv = eltP(\"div\", null, \"CodeMirror-code\");\n    // Elements are added to these to represent selection and cursors.\n    d.selectionDiv = elt(\"div\", null, null, \"position: relative; z-index: 1\");\n    d.cursorDiv = elt(\"div\", null, \"CodeMirror-cursors\");\n    // A visibility: hidden element used to find the size of things.\n    d.measure = elt(\"div\", null, \"CodeMirror-measure\");\n    // When lines outside of the viewport are measured, they are drawn in this.\n    d.lineMeasure = elt(\"div\", null, \"CodeMirror-measure\");\n    // Wraps everything that needs to exist inside the vertically-padded coordinate system\n    d.lineSpace = eltP(\"div\", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],\n                      null, \"position: relative; outline: none\");\n    var lines = eltP(\"div\", [d.lineSpace], \"CodeMirror-lines\");\n    // Moved around its parent to cover visible view.\n    d.mover = elt(\"div\", [lines], null, \"position: relative\");\n    // Set to the height of the document, allowing scrolling.\n    d.sizer = elt(\"div\", [d.mover], \"CodeMirror-sizer\");\n    d.sizerWidth = null;\n    // Behavior of elts with overflow: auto and padding is\n    // inconsistent across browsers. This is used to ensure the\n    // scrollable area is big enough.\n    d.heightForcer = elt(\"div\", null, null, \"position: absolute; height: \" + scrollerGap + \"px; width: 1px;\");\n    // Will contain the gutters, if any.\n    d.gutters = elt(\"div\", null, \"CodeMirror-gutters\");\n    d.lineGutter = null;\n    // Actual scrollable element.\n    d.scroller = elt(\"div\", [d.sizer, d.heightForcer, d.gutters], \"CodeMirror-scroll\");\n    d.scroller.setAttribute(\"tabIndex\", \"-1\");\n    // The element in which the editor lives.\n    d.wrapper = elt(\"div\", [d.scrollbarFiller, d.gutterFiller, d.scroller], \"CodeMirror\");\n\n    // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)\n    if (ie && ie_version < 8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }\n    if (!webkit && !(gecko && mobile)) { d.scroller.draggable = true; }\n\n    if (place) {\n      if (place.appendChild) { place.appendChild(d.wrapper); }\n      else { place(d.wrapper); }\n    }\n\n    // Current rendered range (may be bigger than the view window).\n    d.viewFrom = d.viewTo = doc.first;\n    d.reportedViewFrom = d.reportedViewTo = doc.first;\n    // Information about the rendered lines.\n    d.view = [];\n    d.renderedView = null;\n    // Holds info about a single rendered line when it was rendered\n    // for measurement, while not in view.\n    d.externalMeasured = null;\n    // Empty space (in pixels) above the view\n    d.viewOffset = 0;\n    d.lastWrapHeight = d.lastWrapWidth = 0;\n    d.updateLineNumbers = null;\n\n    d.nativeBarWidth = d.barHeight = d.barWidth = 0;\n    d.scrollbarsClipped = false;\n\n    // Used to only resize the line number gutter when necessary (when\n    // the amount of lines crosses a boundary that makes its width change)\n    d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;\n    // Set to true when a non-horizontal-scrolling line widget is\n    // added. As an optimization, line widget aligning is skipped when\n    // this is false.\n    d.alignWidgets = false;\n\n    d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;\n\n    // Tracks the maximum line length so that the horizontal scrollbar\n    // can be kept static when scrolling.\n    d.maxLine = null;\n    d.maxLineLength = 0;\n    d.maxLineChanged = false;\n\n    // Used for measuring wheel scrolling granularity\n    d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;\n\n    // True when shift is held down.\n    d.shift = false;\n\n    // Used to track whether anything happened since the context menu\n    // was opened.\n    d.selForContextMenu = null;\n\n    d.activeTouch = null;\n\n    d.gutterSpecs = getGutters(options.gutters, options.lineNumbers);\n    renderGutters(d);\n\n    input.init(d);\n  }\n\n  // Since the delta values reported on mouse wheel events are\n  // unstandardized between browsers and even browser versions, and\n  // generally horribly unpredictable, this code starts by measuring\n  // the scroll effect that the first few mouse wheel events have,\n  // and, from that, detects the way it can convert deltas to pixel\n  // offsets afterwards.\n  //\n  // The reason we want to know the amount a wheel event will scroll\n  // is that it gives us a chance to update the display before the\n  // actual scrolling happens, reducing flickering.\n\n  var wheelSamples = 0, wheelPixelsPerUnit = null;\n  // Fill in a browser-detected starting value on browsers where we\n  // know one. These don't have to be accurate -- the result of them\n  // being wrong would just be a slight flicker on the first wheel\n  // scroll (if it is large enough).\n  if (ie) { wheelPixelsPerUnit = -.53; }\n  else if (gecko) { wheelPixelsPerUnit = 15; }\n  else if (chrome) { wheelPixelsPerUnit = -.7; }\n  else if (safari) { wheelPixelsPerUnit = -1/3; }\n\n  function wheelEventDelta(e) {\n    var dx = e.wheelDeltaX, dy = e.wheelDeltaY;\n    if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) { dx = e.detail; }\n    if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) { dy = e.detail; }\n    else if (dy == null) { dy = e.wheelDelta; }\n    return {x: dx, y: dy}\n  }\n  function wheelEventPixels(e) {\n    var delta = wheelEventDelta(e);\n    delta.x *= wheelPixelsPerUnit;\n    delta.y *= wheelPixelsPerUnit;\n    return delta\n  }\n\n  function onScrollWheel(cm, e) {\n    var delta = wheelEventDelta(e), dx = delta.x, dy = delta.y;\n\n    var display = cm.display, scroll = display.scroller;\n    // Quit if there's nothing to scroll here\n    var canScrollX = scroll.scrollWidth > scroll.clientWidth;\n    var canScrollY = scroll.scrollHeight > scroll.clientHeight;\n    if (!(dx && canScrollX || dy && canScrollY)) { return }\n\n    // Webkit browsers on OS X abort momentum scrolls when the target\n    // of the scroll event is removed from the scrollable element.\n    // This hack (see related code in patchDisplay) makes sure the\n    // element is kept around.\n    if (dy && mac && webkit) {\n      outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {\n        for (var i = 0; i < view.length; i++) {\n          if (view[i].node == cur) {\n            cm.display.currentWheelTarget = cur;\n            break outer\n          }\n        }\n      }\n    }\n\n    // On some browsers, horizontal scrolling will cause redraws to\n    // happen before the gutter has been realigned, causing it to\n    // wriggle around in a most unseemly way. When we have an\n    // estimated pixels/delta value, we just handle horizontal\n    // scrolling entirely here. It'll be slightly off from native, but\n    // better than glitching out.\n    if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {\n      if (dy && canScrollY)\n        { updateScrollTop(cm, Math.max(0, scroll.scrollTop + dy * wheelPixelsPerUnit)); }\n      setScrollLeft(cm, Math.max(0, scroll.scrollLeft + dx * wheelPixelsPerUnit));\n      // Only prevent default scrolling if vertical scrolling is\n      // actually possible. Otherwise, it causes vertical scroll\n      // jitter on OSX trackpads when deltaX is small and deltaY\n      // is large (issue #3579)\n      if (!dy || (dy && canScrollY))\n        { e_preventDefault(e); }\n      display.wheelStartX = null; // Abort measurement, if in progress\n      return\n    }\n\n    // 'Project' the visible viewport to cover the area that is being\n    // scrolled into view (if we know enough to estimate it).\n    if (dy && wheelPixelsPerUnit != null) {\n      var pixels = dy * wheelPixelsPerUnit;\n      var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;\n      if (pixels < 0) { top = Math.max(0, top + pixels - 50); }\n      else { bot = Math.min(cm.doc.height, bot + pixels + 50); }\n      updateDisplaySimple(cm, {top: top, bottom: bot});\n    }\n\n    if (wheelSamples < 20) {\n      if (display.wheelStartX == null) {\n        display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop;\n        display.wheelDX = dx; display.wheelDY = dy;\n        setTimeout(function () {\n          if (display.wheelStartX == null) { return }\n          var movedX = scroll.scrollLeft - display.wheelStartX;\n          var movedY = scroll.scrollTop - display.wheelStartY;\n          var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||\n            (movedX && display.wheelDX && movedX / display.wheelDX);\n          display.wheelStartX = display.wheelStartY = null;\n          if (!sample) { return }\n          wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);\n          ++wheelSamples;\n        }, 200);\n      } else {\n        display.wheelDX += dx; display.wheelDY += dy;\n      }\n    }\n  }\n\n  // Selection objects are immutable. A new one is created every time\n  // the selection changes. A selection is one or more non-overlapping\n  // (and non-touching) ranges, sorted, and an integer that indicates\n  // which one is the primary selection (the one that's scrolled into\n  // view, that getCursor returns, etc).\n  var Selection = function(ranges, primIndex) {\n    this.ranges = ranges;\n    this.primIndex = primIndex;\n  };\n\n  Selection.prototype.primary = function () { return this.ranges[this.primIndex] };\n\n  Selection.prototype.equals = function (other) {\n    if (other == this) { return true }\n    if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) { return false }\n    for (var i = 0; i < this.ranges.length; i++) {\n      var here = this.ranges[i], there = other.ranges[i];\n      if (!equalCursorPos(here.anchor, there.anchor) || !equalCursorPos(here.head, there.head)) { return false }\n    }\n    return true\n  };\n\n  Selection.prototype.deepCopy = function () {\n    var out = [];\n    for (var i = 0; i < this.ranges.length; i++)\n      { out[i] = new Range(copyPos(this.ranges[i].anchor), copyPos(this.ranges[i].head)); }\n    return new Selection(out, this.primIndex)\n  };\n\n  Selection.prototype.somethingSelected = function () {\n    for (var i = 0; i < this.ranges.length; i++)\n      { if (!this.ranges[i].empty()) { return true } }\n    return false\n  };\n\n  Selection.prototype.contains = function (pos, end) {\n    if (!end) { end = pos; }\n    for (var i = 0; i < this.ranges.length; i++) {\n      var range = this.ranges[i];\n      if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0)\n        { return i }\n    }\n    return -1\n  };\n\n  var Range = function(anchor, head) {\n    this.anchor = anchor; this.head = head;\n  };\n\n  Range.prototype.from = function () { return minPos(this.anchor, this.head) };\n  Range.prototype.to = function () { return maxPos(this.anchor, this.head) };\n  Range.prototype.empty = function () { return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch };\n\n  // Take an unsorted, potentially overlapping set of ranges, and\n  // build a selection out of it. 'Consumes' ranges array (modifying\n  // it).\n  function normalizeSelection(cm, ranges, primIndex) {\n    var mayTouch = cm && cm.options.selectionsMayTouch;\n    var prim = ranges[primIndex];\n    ranges.sort(function (a, b) { return cmp(a.from(), b.from()); });\n    primIndex = indexOf(ranges, prim);\n    for (var i = 1; i < ranges.length; i++) {\n      var cur = ranges[i], prev = ranges[i - 1];\n      var diff = cmp(prev.to(), cur.from());\n      if (mayTouch && !cur.empty() ? diff > 0 : diff >= 0) {\n        var from = minPos(prev.from(), cur.from()), to = maxPos(prev.to(), cur.to());\n        var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head;\n        if (i <= primIndex) { --primIndex; }\n        ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to));\n      }\n    }\n    return new Selection(ranges, primIndex)\n  }\n\n  function simpleSelection(anchor, head) {\n    return new Selection([new Range(anchor, head || anchor)], 0)\n  }\n\n  // Compute the position of the end of a change (its 'to' property\n  // refers to the pre-change end).\n  function changeEnd(change) {\n    if (!change.text) { return change.to }\n    return Pos(change.from.line + change.text.length - 1,\n               lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0))\n  }\n\n  // Adjust a position to refer to the post-change position of the\n  // same text, or the end of the change if the change covers it.\n  function adjustForChange(pos, change) {\n    if (cmp(pos, change.from) < 0) { return pos }\n    if (cmp(pos, change.to) <= 0) { return changeEnd(change) }\n\n    var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;\n    if (pos.line == change.to.line) { ch += changeEnd(change).ch - change.to.ch; }\n    return Pos(line, ch)\n  }\n\n  function computeSelAfterChange(doc, change) {\n    var out = [];\n    for (var i = 0; i < doc.sel.ranges.length; i++) {\n      var range = doc.sel.ranges[i];\n      out.push(new Range(adjustForChange(range.anchor, change),\n                         adjustForChange(range.head, change)));\n    }\n    return normalizeSelection(doc.cm, out, doc.sel.primIndex)\n  }\n\n  function offsetPos(pos, old, nw) {\n    if (pos.line == old.line)\n      { return Pos(nw.line, pos.ch - old.ch + nw.ch) }\n    else\n      { return Pos(nw.line + (pos.line - old.line), pos.ch) }\n  }\n\n  // Used by replaceSelections to allow moving the selection to the\n  // start or around the replaced test. Hint may be \"start\" or \"around\".\n  function computeReplacedSel(doc, changes, hint) {\n    var out = [];\n    var oldPrev = Pos(doc.first, 0), newPrev = oldPrev;\n    for (var i = 0; i < changes.length; i++) {\n      var change = changes[i];\n      var from = offsetPos(change.from, oldPrev, newPrev);\n      var to = offsetPos(changeEnd(change), oldPrev, newPrev);\n      oldPrev = change.to;\n      newPrev = to;\n      if (hint == \"around\") {\n        var range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0;\n        out[i] = new Range(inv ? to : from, inv ? from : to);\n      } else {\n        out[i] = new Range(from, from);\n      }\n    }\n    return new Selection(out, doc.sel.primIndex)\n  }\n\n  // Used to get the editor into a consistent state again when options change.\n\n  function loadMode(cm) {\n    cm.doc.mode = getMode(cm.options, cm.doc.modeOption);\n    resetModeState(cm);\n  }\n\n  function resetModeState(cm) {\n    cm.doc.iter(function (line) {\n      if (line.stateAfter) { line.stateAfter = null; }\n      if (line.styles) { line.styles = null; }\n    });\n    cm.doc.modeFrontier = cm.doc.highlightFrontier = cm.doc.first;\n    startWorker(cm, 100);\n    cm.state.modeGen++;\n    if (cm.curOp) { regChange(cm); }\n  }\n\n  // DOCUMENT DATA STRUCTURE\n\n  // By default, updates that start and end at the beginning of a line\n  // are treated specially, in order to make the association of line\n  // widgets and marker elements with the text behave more intuitive.\n  function isWholeLineUpdate(doc, change) {\n    return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == \"\" &&\n      (!doc.cm || doc.cm.options.wholeLineUpdateBefore)\n  }\n\n  // Perform a change on the document data structure.\n  function updateDoc(doc, change, markedSpans, estimateHeight) {\n    function spansFor(n) {return markedSpans ? markedSpans[n] : null}\n    function update(line, text, spans) {\n      updateLine(line, text, spans, estimateHeight);\n      signalLater(line, \"change\", line, change);\n    }\n    function linesFor(start, end) {\n      var result = [];\n      for (var i = start; i < end; ++i)\n        { result.push(new Line(text[i], spansFor(i), estimateHeight)); }\n      return result\n    }\n\n    var from = change.from, to = change.to, text = change.text;\n    var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line);\n    var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line;\n\n    // Adjust the line structure\n    if (change.full) {\n      doc.insert(0, linesFor(0, text.length));\n      doc.remove(text.length, doc.size - text.length);\n    } else if (isWholeLineUpdate(doc, change)) {\n      // This is a whole-line replace. Treated specially to make\n      // sure line objects move the way they are supposed to.\n      var added = linesFor(0, text.length - 1);\n      update(lastLine, lastLine.text, lastSpans);\n      if (nlines) { doc.remove(from.line, nlines); }\n      if (added.length) { doc.insert(from.line, added); }\n    } else if (firstLine == lastLine) {\n      if (text.length == 1) {\n        update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);\n      } else {\n        var added$1 = linesFor(1, text.length - 1);\n        added$1.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight));\n        update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));\n        doc.insert(from.line + 1, added$1);\n      }\n    } else if (text.length == 1) {\n      update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));\n      doc.remove(from.line + 1, nlines);\n    } else {\n      update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));\n      update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);\n      var added$2 = linesFor(1, text.length - 1);\n      if (nlines > 1) { doc.remove(from.line + 1, nlines - 1); }\n      doc.insert(from.line + 1, added$2);\n    }\n\n    signalLater(doc, \"change\", doc, change);\n  }\n\n  // Call f for all linked documents.\n  function linkedDocs(doc, f, sharedHistOnly) {\n    function propagate(doc, skip, sharedHist) {\n      if (doc.linked) { for (var i = 0; i < doc.linked.length; ++i) {\n        var rel = doc.linked[i];\n        if (rel.doc == skip) { continue }\n        var shared = sharedHist && rel.sharedHist;\n        if (sharedHistOnly && !shared) { continue }\n        f(rel.doc, shared);\n        propagate(rel.doc, doc, shared);\n      } }\n    }\n    propagate(doc, null, true);\n  }\n\n  // Attach a document to an editor.\n  function attachDoc(cm, doc) {\n    if (doc.cm) { throw new Error(\"This document is already in use.\") }\n    cm.doc = doc;\n    doc.cm = cm;\n    estimateLineHeights(cm);\n    loadMode(cm);\n    setDirectionClass(cm);\n    cm.options.direction = doc.direction;\n    if (!cm.options.lineWrapping) { findMaxLine(cm); }\n    cm.options.mode = doc.modeOption;\n    regChange(cm);\n  }\n\n  function setDirectionClass(cm) {\n  (cm.doc.direction == \"rtl\" ? addClass : rmClass)(cm.display.lineDiv, \"CodeMirror-rtl\");\n  }\n\n  function directionChanged(cm) {\n    runInOp(cm, function () {\n      setDirectionClass(cm);\n      regChange(cm);\n    });\n  }\n\n  function History(prev) {\n    // Arrays of change events and selections. Doing something adds an\n    // event to done and clears undo. Undoing moves events from done\n    // to undone, redoing moves them in the other direction.\n    this.done = []; this.undone = [];\n    this.undoDepth = prev ? prev.undoDepth : Infinity;\n    // Used to track when changes can be merged into a single undo\n    // event\n    this.lastModTime = this.lastSelTime = 0;\n    this.lastOp = this.lastSelOp = null;\n    this.lastOrigin = this.lastSelOrigin = null;\n    // Used by the isClean() method\n    this.generation = this.maxGeneration = prev ? prev.maxGeneration : 1;\n  }\n\n  // Create a history change event from an updateDoc-style change\n  // object.\n  function historyChangeFromChange(doc, change) {\n    var histChange = {from: copyPos(change.from), to: changeEnd(change), text: getBetween(doc, change.from, change.to)};\n    attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);\n    linkedDocs(doc, function (doc) { return attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1); }, true);\n    return histChange\n  }\n\n  // Pop all selection events off the end of a history array. Stop at\n  // a change event.\n  function clearSelectionEvents(array) {\n    while (array.length) {\n      var last = lst(array);\n      if (last.ranges) { array.pop(); }\n      else { break }\n    }\n  }\n\n  // Find the top change event in the history. Pop off selection\n  // events that are in the way.\n  function lastChangeEvent(hist, force) {\n    if (force) {\n      clearSelectionEvents(hist.done);\n      return lst(hist.done)\n    } else if (hist.done.length && !lst(hist.done).ranges) {\n      return lst(hist.done)\n    } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {\n      hist.done.pop();\n      return lst(hist.done)\n    }\n  }\n\n  // Register a change in the history. Merges changes that are within\n  // a single operation, or are close together with an origin that\n  // allows merging (starting with \"+\") into a single event.\n  function addChangeToHistory(doc, change, selAfter, opId) {\n    var hist = doc.history;\n    hist.undone.length = 0;\n    var time = +new Date, cur;\n    var last;\n\n    if ((hist.lastOp == opId ||\n         hist.lastOrigin == change.origin && change.origin &&\n         ((change.origin.charAt(0) == \"+\" && hist.lastModTime > time - (doc.cm ? doc.cm.options.historyEventDelay : 500)) ||\n          change.origin.charAt(0) == \"*\")) &&\n        (cur = lastChangeEvent(hist, hist.lastOp == opId))) {\n      // Merge this change into the last event\n      last = lst(cur.changes);\n      if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {\n        // Optimized case for simple insertion -- don't want to add\n        // new changesets for every character typed\n        last.to = changeEnd(change);\n      } else {\n        // Add new sub-event\n        cur.changes.push(historyChangeFromChange(doc, change));\n      }\n    } else {\n      // Can not be merged, start a new event.\n      var before = lst(hist.done);\n      if (!before || !before.ranges)\n        { pushSelectionToHistory(doc.sel, hist.done); }\n      cur = {changes: [historyChangeFromChange(doc, change)],\n             generation: hist.generation};\n      hist.done.push(cur);\n      while (hist.done.length > hist.undoDepth) {\n        hist.done.shift();\n        if (!hist.done[0].ranges) { hist.done.shift(); }\n      }\n    }\n    hist.done.push(selAfter);\n    hist.generation = ++hist.maxGeneration;\n    hist.lastModTime = hist.lastSelTime = time;\n    hist.lastOp = hist.lastSelOp = opId;\n    hist.lastOrigin = hist.lastSelOrigin = change.origin;\n\n    if (!last) { signal(doc, \"historyAdded\"); }\n  }\n\n  function selectionEventCanBeMerged(doc, origin, prev, sel) {\n    var ch = origin.charAt(0);\n    return ch == \"*\" ||\n      ch == \"+\" &&\n      prev.ranges.length == sel.ranges.length &&\n      prev.somethingSelected() == sel.somethingSelected() &&\n      new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500)\n  }\n\n  // Called whenever the selection changes, sets the new selection as\n  // the pending selection in the history, and pushes the old pending\n  // selection into the 'done' array when it was significantly\n  // different (in number of selected ranges, emptiness, or time).\n  function addSelectionToHistory(doc, sel, opId, options) {\n    var hist = doc.history, origin = options && options.origin;\n\n    // A new event is started when the previous origin does not match\n    // the current, or the origins don't allow matching. Origins\n    // starting with * are always merged, those starting with + are\n    // merged when similar and close together in time.\n    if (opId == hist.lastSelOp ||\n        (origin && hist.lastSelOrigin == origin &&\n         (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||\n          selectionEventCanBeMerged(doc, origin, lst(hist.done), sel))))\n      { hist.done[hist.done.length - 1] = sel; }\n    else\n      { pushSelectionToHistory(sel, hist.done); }\n\n    hist.lastSelTime = +new Date;\n    hist.lastSelOrigin = origin;\n    hist.lastSelOp = opId;\n    if (options && options.clearRedo !== false)\n      { clearSelectionEvents(hist.undone); }\n  }\n\n  function pushSelectionToHistory(sel, dest) {\n    var top = lst(dest);\n    if (!(top && top.ranges && top.equals(sel)))\n      { dest.push(sel); }\n  }\n\n  // Used to store marked span information in the history.\n  function attachLocalSpans(doc, change, from, to) {\n    var existing = change[\"spans_\" + doc.id], n = 0;\n    doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function (line) {\n      if (line.markedSpans)\n        { (existing || (existing = change[\"spans_\" + doc.id] = {}))[n] = line.markedSpans; }\n      ++n;\n    });\n  }\n\n  // When un/re-doing restores text containing marked spans, those\n  // that have been explicitly cleared should not be restored.\n  function removeClearedSpans(spans) {\n    if (!spans) { return null }\n    var out;\n    for (var i = 0; i < spans.length; ++i) {\n      if (spans[i].marker.explicitlyCleared) { if (!out) { out = spans.slice(0, i); } }\n      else if (out) { out.push(spans[i]); }\n    }\n    return !out ? spans : out.length ? out : null\n  }\n\n  // Retrieve and filter the old marked spans stored in a change event.\n  function getOldSpans(doc, change) {\n    var found = change[\"spans_\" + doc.id];\n    if (!found) { return null }\n    var nw = [];\n    for (var i = 0; i < change.text.length; ++i)\n      { nw.push(removeClearedSpans(found[i])); }\n    return nw\n  }\n\n  // Used for un/re-doing changes from the history. Combines the\n  // result of computing the existing spans with the set of spans that\n  // existed in the history (so that deleting around a span and then\n  // undoing brings back the span).\n  function mergeOldSpans(doc, change) {\n    var old = getOldSpans(doc, change);\n    var stretched = stretchSpansOverChange(doc, change);\n    if (!old) { return stretched }\n    if (!stretched) { return old }\n\n    for (var i = 0; i < old.length; ++i) {\n      var oldCur = old[i], stretchCur = stretched[i];\n      if (oldCur && stretchCur) {\n        spans: for (var j = 0; j < stretchCur.length; ++j) {\n          var span = stretchCur[j];\n          for (var k = 0; k < oldCur.length; ++k)\n            { if (oldCur[k].marker == span.marker) { continue spans } }\n          oldCur.push(span);\n        }\n      } else if (stretchCur) {\n        old[i] = stretchCur;\n      }\n    }\n    return old\n  }\n\n  // Used both to provide a JSON-safe object in .getHistory, and, when\n  // detaching a document, to split the history in two\n  function copyHistoryArray(events, newGroup, instantiateSel) {\n    var copy = [];\n    for (var i = 0; i < events.length; ++i) {\n      var event = events[i];\n      if (event.ranges) {\n        copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event);\n        continue\n      }\n      var changes = event.changes, newChanges = [];\n      copy.push({changes: newChanges});\n      for (var j = 0; j < changes.length; ++j) {\n        var change = changes[j], m = (void 0);\n        newChanges.push({from: change.from, to: change.to, text: change.text});\n        if (newGroup) { for (var prop in change) { if (m = prop.match(/^spans_(\\d+)$/)) {\n          if (indexOf(newGroup, Number(m[1])) > -1) {\n            lst(newChanges)[prop] = change[prop];\n            delete change[prop];\n          }\n        } } }\n      }\n    }\n    return copy\n  }\n\n  // The 'scroll' parameter given to many of these indicated whether\n  // the new cursor position should be scrolled into view after\n  // modifying the selection.\n\n  // If shift is held or the extend flag is set, extends a range to\n  // include a given position (and optionally a second position).\n  // Otherwise, simply returns the range between the given positions.\n  // Used for cursor motion and such.\n  function extendRange(range, head, other, extend) {\n    if (extend) {\n      var anchor = range.anchor;\n      if (other) {\n        var posBefore = cmp(head, anchor) < 0;\n        if (posBefore != (cmp(other, anchor) < 0)) {\n          anchor = head;\n          head = other;\n        } else if (posBefore != (cmp(head, other) < 0)) {\n          head = other;\n        }\n      }\n      return new Range(anchor, head)\n    } else {\n      return new Range(other || head, head)\n    }\n  }\n\n  // Extend the primary selection range, discard the rest.\n  function extendSelection(doc, head, other, options, extend) {\n    if (extend == null) { extend = doc.cm && (doc.cm.display.shift || doc.extend); }\n    setSelection(doc, new Selection([extendRange(doc.sel.primary(), head, other, extend)], 0), options);\n  }\n\n  // Extend all selections (pos is an array of selections with length\n  // equal the number of selections)\n  function extendSelections(doc, heads, options) {\n    var out = [];\n    var extend = doc.cm && (doc.cm.display.shift || doc.extend);\n    for (var i = 0; i < doc.sel.ranges.length; i++)\n      { out[i] = extendRange(doc.sel.ranges[i], heads[i], null, extend); }\n    var newSel = normalizeSelection(doc.cm, out, doc.sel.primIndex);\n    setSelection(doc, newSel, options);\n  }\n\n  // Updates a single range in the selection.\n  function replaceOneSelection(doc, i, range, options) {\n    var ranges = doc.sel.ranges.slice(0);\n    ranges[i] = range;\n    setSelection(doc, normalizeSelection(doc.cm, ranges, doc.sel.primIndex), options);\n  }\n\n  // Reset the selection to a single range.\n  function setSimpleSelection(doc, anchor, head, options) {\n    setSelection(doc, simpleSelection(anchor, head), options);\n  }\n\n  // Give beforeSelectionChange handlers a change to influence a\n  // selection update.\n  function filterSelectionChange(doc, sel, options) {\n    var obj = {\n      ranges: sel.ranges,\n      update: function(ranges) {\n        this.ranges = [];\n        for (var i = 0; i < ranges.length; i++)\n          { this.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),\n                                     clipPos(doc, ranges[i].head)); }\n      },\n      origin: options && options.origin\n    };\n    signal(doc, \"beforeSelectionChange\", doc, obj);\n    if (doc.cm) { signal(doc.cm, \"beforeSelectionChange\", doc.cm, obj); }\n    if (obj.ranges != sel.ranges) { return normalizeSelection(doc.cm, obj.ranges, obj.ranges.length - 1) }\n    else { return sel }\n  }\n\n  function setSelectionReplaceHistory(doc, sel, options) {\n    var done = doc.history.done, last = lst(done);\n    if (last && last.ranges) {\n      done[done.length - 1] = sel;\n      setSelectionNoUndo(doc, sel, options);\n    } else {\n      setSelection(doc, sel, options);\n    }\n  }\n\n  // Set a new selection.\n  function setSelection(doc, sel, options) {\n    setSelectionNoUndo(doc, sel, options);\n    addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options);\n  }\n\n  function setSelectionNoUndo(doc, sel, options) {\n    if (hasHandler(doc, \"beforeSelectionChange\") || doc.cm && hasHandler(doc.cm, \"beforeSelectionChange\"))\n      { sel = filterSelectionChange(doc, sel, options); }\n\n    var bias = options && options.bias ||\n      (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1);\n    setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));\n\n    if (!(options && options.scroll === false) && doc.cm && doc.cm.getOption(\"readOnly\") != \"nocursor\")\n      { ensureCursorVisible(doc.cm); }\n  }\n\n  function setSelectionInner(doc, sel) {\n    if (sel.equals(doc.sel)) { return }\n\n    doc.sel = sel;\n\n    if (doc.cm) {\n      doc.cm.curOp.updateInput = 1;\n      doc.cm.curOp.selectionChanged = true;\n      signalCursorActivity(doc.cm);\n    }\n    signalLater(doc, \"cursorActivity\", doc);\n  }\n\n  // Verify that the selection does not partially select any atomic\n  // marked ranges.\n  function reCheckSelection(doc) {\n    setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false));\n  }\n\n  // Return a selection that does not partially select any atomic\n  // ranges.\n  function skipAtomicInSelection(doc, sel, bias, mayClear) {\n    var out;\n    for (var i = 0; i < sel.ranges.length; i++) {\n      var range = sel.ranges[i];\n      var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i];\n      var newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear);\n      var newHead = skipAtomic(doc, range.head, old && old.head, bias, mayClear);\n      if (out || newAnchor != range.anchor || newHead != range.head) {\n        if (!out) { out = sel.ranges.slice(0, i); }\n        out[i] = new Range(newAnchor, newHead);\n      }\n    }\n    return out ? normalizeSelection(doc.cm, out, sel.primIndex) : sel\n  }\n\n  function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {\n    var line = getLine(doc, pos.line);\n    if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {\n      var sp = line.markedSpans[i], m = sp.marker;\n\n      // Determine if we should prevent the cursor being placed to the left/right of an atomic marker\n      // Historically this was determined using the inclusiveLeft/Right option, but the new way to control it\n      // is with selectLeft/Right\n      var preventCursorLeft = (\"selectLeft\" in m) ? !m.selectLeft : m.inclusiveLeft;\n      var preventCursorRight = (\"selectRight\" in m) ? !m.selectRight : m.inclusiveRight;\n\n      if ((sp.from == null || (preventCursorLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&\n          (sp.to == null || (preventCursorRight ? sp.to >= pos.ch : sp.to > pos.ch))) {\n        if (mayClear) {\n          signal(m, \"beforeCursorEnter\");\n          if (m.explicitlyCleared) {\n            if (!line.markedSpans) { break }\n            else {--i; continue}\n          }\n        }\n        if (!m.atomic) { continue }\n\n        if (oldPos) {\n          var near = m.find(dir < 0 ? 1 : -1), diff = (void 0);\n          if (dir < 0 ? preventCursorRight : preventCursorLeft)\n            { near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null); }\n          if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0))\n            { return skipAtomicInner(doc, near, pos, dir, mayClear) }\n        }\n\n        var far = m.find(dir < 0 ? -1 : 1);\n        if (dir < 0 ? preventCursorLeft : preventCursorRight)\n          { far = movePos(doc, far, dir, far.line == pos.line ? line : null); }\n        return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null\n      }\n    } }\n    return pos\n  }\n\n  // Ensure a given position is not inside an atomic range.\n  function skipAtomic(doc, pos, oldPos, bias, mayClear) {\n    var dir = bias || 1;\n    var found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||\n        (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||\n        skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||\n        (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true));\n    if (!found) {\n      doc.cantEdit = true;\n      return Pos(doc.first, 0)\n    }\n    return found\n  }\n\n  function movePos(doc, pos, dir, line) {\n    if (dir < 0 && pos.ch == 0) {\n      if (pos.line > doc.first) { return clipPos(doc, Pos(pos.line - 1)) }\n      else { return null }\n    } else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {\n      if (pos.line < doc.first + doc.size - 1) { return Pos(pos.line + 1, 0) }\n      else { return null }\n    } else {\n      return new Pos(pos.line, pos.ch + dir)\n    }\n  }\n\n  function selectAll(cm) {\n    cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);\n  }\n\n  // UPDATING\n\n  // Allow \"beforeChange\" event handlers to influence a change\n  function filterChange(doc, change, update) {\n    var obj = {\n      canceled: false,\n      from: change.from,\n      to: change.to,\n      text: change.text,\n      origin: change.origin,\n      cancel: function () { return obj.canceled = true; }\n    };\n    if (update) { obj.update = function (from, to, text, origin) {\n      if (from) { obj.from = clipPos(doc, from); }\n      if (to) { obj.to = clipPos(doc, to); }\n      if (text) { obj.text = text; }\n      if (origin !== undefined) { obj.origin = origin; }\n    }; }\n    signal(doc, \"beforeChange\", doc, obj);\n    if (doc.cm) { signal(doc.cm, \"beforeChange\", doc.cm, obj); }\n\n    if (obj.canceled) {\n      if (doc.cm) { doc.cm.curOp.updateInput = 2; }\n      return null\n    }\n    return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin}\n  }\n\n  // Apply a change to a document, and add it to the document's\n  // history, and propagating it to all linked documents.\n  function makeChange(doc, change, ignoreReadOnly) {\n    if (doc.cm) {\n      if (!doc.cm.curOp) { return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly) }\n      if (doc.cm.state.suppressEdits) { return }\n    }\n\n    if (hasHandler(doc, \"beforeChange\") || doc.cm && hasHandler(doc.cm, \"beforeChange\")) {\n      change = filterChange(doc, change, true);\n      if (!change) { return }\n    }\n\n    // Possibly split or suppress the update based on the presence\n    // of read-only spans in its range.\n    var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);\n    if (split) {\n      for (var i = split.length - 1; i >= 0; --i)\n        { makeChangeInner(doc, {from: split[i].from, to: split[i].to, text: i ? [\"\"] : change.text, origin: change.origin}); }\n    } else {\n      makeChangeInner(doc, change);\n    }\n  }\n\n  function makeChangeInner(doc, change) {\n    if (change.text.length == 1 && change.text[0] == \"\" && cmp(change.from, change.to) == 0) { return }\n    var selAfter = computeSelAfterChange(doc, change);\n    addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);\n\n    makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));\n    var rebased = [];\n\n    linkedDocs(doc, function (doc, sharedHist) {\n      if (!sharedHist && indexOf(rebased, doc.history) == -1) {\n        rebaseHist(doc.history, change);\n        rebased.push(doc.history);\n      }\n      makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));\n    });\n  }\n\n  // Revert a change stored in a document's history.\n  function makeChangeFromHistory(doc, type, allowSelectionOnly) {\n    var suppress = doc.cm && doc.cm.state.suppressEdits;\n    if (suppress && !allowSelectionOnly) { return }\n\n    var hist = doc.history, event, selAfter = doc.sel;\n    var source = type == \"undo\" ? hist.done : hist.undone, dest = type == \"undo\" ? hist.undone : hist.done;\n\n    // Verify that there is a useable event (so that ctrl-z won't\n    // needlessly clear selection events)\n    var i = 0;\n    for (; i < source.length; i++) {\n      event = source[i];\n      if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges)\n        { break }\n    }\n    if (i == source.length) { return }\n    hist.lastOrigin = hist.lastSelOrigin = null;\n\n    for (;;) {\n      event = source.pop();\n      if (event.ranges) {\n        pushSelectionToHistory(event, dest);\n        if (allowSelectionOnly && !event.equals(doc.sel)) {\n          setSelection(doc, event, {clearRedo: false});\n          return\n        }\n        selAfter = event;\n      } else if (suppress) {\n        source.push(event);\n        return\n      } else { break }\n    }\n\n    // Build up a reverse change object to add to the opposite history\n    // stack (redo when undoing, and vice versa).\n    var antiChanges = [];\n    pushSelectionToHistory(selAfter, dest);\n    dest.push({changes: antiChanges, generation: hist.generation});\n    hist.generation = event.generation || ++hist.maxGeneration;\n\n    var filter = hasHandler(doc, \"beforeChange\") || doc.cm && hasHandler(doc.cm, \"beforeChange\");\n\n    var loop = function ( i ) {\n      var change = event.changes[i];\n      change.origin = type;\n      if (filter && !filterChange(doc, change, false)) {\n        source.length = 0;\n        return {}\n      }\n\n      antiChanges.push(historyChangeFromChange(doc, change));\n\n      var after = i ? computeSelAfterChange(doc, change) : lst(source);\n      makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));\n      if (!i && doc.cm) { doc.cm.scrollIntoView({from: change.from, to: changeEnd(change)}); }\n      var rebased = [];\n\n      // Propagate to the linked documents\n      linkedDocs(doc, function (doc, sharedHist) {\n        if (!sharedHist && indexOf(rebased, doc.history) == -1) {\n          rebaseHist(doc.history, change);\n          rebased.push(doc.history);\n        }\n        makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));\n      });\n    };\n\n    for (var i$1 = event.changes.length - 1; i$1 >= 0; --i$1) {\n      var returned = loop( i$1 );\n\n      if ( returned ) return returned.v;\n    }\n  }\n\n  // Sub-views need their line numbers shifted when text is added\n  // above or below them in the parent document.\n  function shiftDoc(doc, distance) {\n    if (distance == 0) { return }\n    doc.first += distance;\n    doc.sel = new Selection(map(doc.sel.ranges, function (range) { return new Range(\n      Pos(range.anchor.line + distance, range.anchor.ch),\n      Pos(range.head.line + distance, range.head.ch)\n    ); }), doc.sel.primIndex);\n    if (doc.cm) {\n      regChange(doc.cm, doc.first, doc.first - distance, distance);\n      for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++)\n        { regLineChange(doc.cm, l, \"gutter\"); }\n    }\n  }\n\n  // More lower-level change function, handling only a single document\n  // (not linked ones).\n  function makeChangeSingleDoc(doc, change, selAfter, spans) {\n    if (doc.cm && !doc.cm.curOp)\n      { return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans) }\n\n    if (change.to.line < doc.first) {\n      shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));\n      return\n    }\n    if (change.from.line > doc.lastLine()) { return }\n\n    // Clip the change to the size of this doc\n    if (change.from.line < doc.first) {\n      var shift = change.text.length - 1 - (doc.first - change.from.line);\n      shiftDoc(doc, shift);\n      change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),\n                text: [lst(change.text)], origin: change.origin};\n    }\n    var last = doc.lastLine();\n    if (change.to.line > last) {\n      change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),\n                text: [change.text[0]], origin: change.origin};\n    }\n\n    change.removed = getBetween(doc, change.from, change.to);\n\n    if (!selAfter) { selAfter = computeSelAfterChange(doc, change); }\n    if (doc.cm) { makeChangeSingleDocInEditor(doc.cm, change, spans); }\n    else { updateDoc(doc, change, spans); }\n    setSelectionNoUndo(doc, selAfter, sel_dontScroll);\n\n    if (doc.cantEdit && skipAtomic(doc, Pos(doc.firstLine(), 0)))\n      { doc.cantEdit = false; }\n  }\n\n  // Handle the interaction of a change to a document with the editor\n  // that this document is part of.\n  function makeChangeSingleDocInEditor(cm, change, spans) {\n    var doc = cm.doc, display = cm.display, from = change.from, to = change.to;\n\n    var recomputeMaxLength = false, checkWidthStart = from.line;\n    if (!cm.options.lineWrapping) {\n      checkWidthStart = lineNo(visualLine(getLine(doc, from.line)));\n      doc.iter(checkWidthStart, to.line + 1, function (line) {\n        if (line == display.maxLine) {\n          recomputeMaxLength = true;\n          return true\n        }\n      });\n    }\n\n    if (doc.sel.contains(change.from, change.to) > -1)\n      { signalCursorActivity(cm); }\n\n    updateDoc(doc, change, spans, estimateHeight(cm));\n\n    if (!cm.options.lineWrapping) {\n      doc.iter(checkWidthStart, from.line + change.text.length, function (line) {\n        var len = lineLength(line);\n        if (len > display.maxLineLength) {\n          display.maxLine = line;\n          display.maxLineLength = len;\n          display.maxLineChanged = true;\n          recomputeMaxLength = false;\n        }\n      });\n      if (recomputeMaxLength) { cm.curOp.updateMaxLine = true; }\n    }\n\n    retreatFrontier(doc, from.line);\n    startWorker(cm, 400);\n\n    var lendiff = change.text.length - (to.line - from.line) - 1;\n    // Remember that these lines changed, for updating the display\n    if (change.full)\n      { regChange(cm); }\n    else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change))\n      { regLineChange(cm, from.line, \"text\"); }\n    else\n      { regChange(cm, from.line, to.line + 1, lendiff); }\n\n    var changesHandler = hasHandler(cm, \"changes\"), changeHandler = hasHandler(cm, \"change\");\n    if (changeHandler || changesHandler) {\n      var obj = {\n        from: from, to: to,\n        text: change.text,\n        removed: change.removed,\n        origin: change.origin\n      };\n      if (changeHandler) { signalLater(cm, \"change\", cm, obj); }\n      if (changesHandler) { (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj); }\n    }\n    cm.display.selForContextMenu = null;\n  }\n\n  function replaceRange(doc, code, from, to, origin) {\n    var assign;\n\n    if (!to) { to = from; }\n    if (cmp(to, from) < 0) { (assign = [to, from], from = assign[0], to = assign[1]); }\n    if (typeof code == \"string\") { code = doc.splitLines(code); }\n    makeChange(doc, {from: from, to: to, text: code, origin: origin});\n  }\n\n  // Rebasing/resetting history to deal with externally-sourced changes\n\n  function rebaseHistSelSingle(pos, from, to, diff) {\n    if (to < pos.line) {\n      pos.line += diff;\n    } else if (from < pos.line) {\n      pos.line = from;\n      pos.ch = 0;\n    }\n  }\n\n  // Tries to rebase an array of history events given a change in the\n  // document. If the change touches the same lines as the event, the\n  // event, and everything 'behind' it, is discarded. If the change is\n  // before the event, the event's positions are updated. Uses a\n  // copy-on-write scheme for the positions, to avoid having to\n  // reallocate them all on every rebase, but also avoid problems with\n  // shared position objects being unsafely updated.\n  function rebaseHistArray(array, from, to, diff) {\n    for (var i = 0; i < array.length; ++i) {\n      var sub = array[i], ok = true;\n      if (sub.ranges) {\n        if (!sub.copied) { sub = array[i] = sub.deepCopy(); sub.copied = true; }\n        for (var j = 0; j < sub.ranges.length; j++) {\n          rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);\n          rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);\n        }\n        continue\n      }\n      for (var j$1 = 0; j$1 < sub.changes.length; ++j$1) {\n        var cur = sub.changes[j$1];\n        if (to < cur.from.line) {\n          cur.from = Pos(cur.from.line + diff, cur.from.ch);\n          cur.to = Pos(cur.to.line + diff, cur.to.ch);\n        } else if (from <= cur.to.line) {\n          ok = false;\n          break\n        }\n      }\n      if (!ok) {\n        array.splice(0, i + 1);\n        i = 0;\n      }\n    }\n  }\n\n  function rebaseHist(hist, change) {\n    var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1;\n    rebaseHistArray(hist.done, from, to, diff);\n    rebaseHistArray(hist.undone, from, to, diff);\n  }\n\n  // Utility for applying a change to a line by handle or number,\n  // returning the number and optionally registering the line as\n  // changed.\n  function changeLine(doc, handle, changeType, op) {\n    var no = handle, line = handle;\n    if (typeof handle == \"number\") { line = getLine(doc, clipLine(doc, handle)); }\n    else { no = lineNo(handle); }\n    if (no == null) { return null }\n    if (op(line, no) && doc.cm) { regLineChange(doc.cm, no, changeType); }\n    return line\n  }\n\n  // The document is represented as a BTree consisting of leaves, with\n  // chunk of lines in them, and branches, with up to ten leaves or\n  // other branch nodes below them. The top node is always a branch\n  // node, and is the document object itself (meaning it has\n  // additional methods and properties).\n  //\n  // All nodes have parent links. The tree is used both to go from\n  // line numbers to line objects, and to go from objects to numbers.\n  // It also indexes by height, and is used to convert between height\n  // and line object, and to find the total height of the document.\n  //\n  // See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html\n\n  function LeafChunk(lines) {\n    this.lines = lines;\n    this.parent = null;\n    var height = 0;\n    for (var i = 0; i < lines.length; ++i) {\n      lines[i].parent = this;\n      height += lines[i].height;\n    }\n    this.height = height;\n  }\n\n  LeafChunk.prototype = {\n    chunkSize: function() { return this.lines.length },\n\n    // Remove the n lines at offset 'at'.\n    removeInner: function(at, n) {\n      for (var i = at, e = at + n; i < e; ++i) {\n        var line = this.lines[i];\n        this.height -= line.height;\n        cleanUpLine(line);\n        signalLater(line, \"delete\");\n      }\n      this.lines.splice(at, n);\n    },\n\n    // Helper used to collapse a small branch into a single leaf.\n    collapse: function(lines) {\n      lines.push.apply(lines, this.lines);\n    },\n\n    // Insert the given array of lines at offset 'at', count them as\n    // having the given height.\n    insertInner: function(at, lines, height) {\n      this.height += height;\n      this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));\n      for (var i = 0; i < lines.length; ++i) { lines[i].parent = this; }\n    },\n\n    // Used to iterate over a part of the tree.\n    iterN: function(at, n, op) {\n      for (var e = at + n; at < e; ++at)\n        { if (op(this.lines[at])) { return true } }\n    }\n  };\n\n  function BranchChunk(children) {\n    this.children = children;\n    var size = 0, height = 0;\n    for (var i = 0; i < children.length; ++i) {\n      var ch = children[i];\n      size += ch.chunkSize(); height += ch.height;\n      ch.parent = this;\n    }\n    this.size = size;\n    this.height = height;\n    this.parent = null;\n  }\n\n  BranchChunk.prototype = {\n    chunkSize: function() { return this.size },\n\n    removeInner: function(at, n) {\n      this.size -= n;\n      for (var i = 0; i < this.children.length; ++i) {\n        var child = this.children[i], sz = child.chunkSize();\n        if (at < sz) {\n          var rm = Math.min(n, sz - at), oldHeight = child.height;\n          child.removeInner(at, rm);\n          this.height -= oldHeight - child.height;\n          if (sz == rm) { this.children.splice(i--, 1); child.parent = null; }\n          if ((n -= rm) == 0) { break }\n          at = 0;\n        } else { at -= sz; }\n      }\n      // If the result is smaller than 25 lines, ensure that it is a\n      // single leaf node.\n      if (this.size - n < 25 &&\n          (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {\n        var lines = [];\n        this.collapse(lines);\n        this.children = [new LeafChunk(lines)];\n        this.children[0].parent = this;\n      }\n    },\n\n    collapse: function(lines) {\n      for (var i = 0; i < this.children.length; ++i) { this.children[i].collapse(lines); }\n    },\n\n    insertInner: function(at, lines, height) {\n      this.size += lines.length;\n      this.height += height;\n      for (var i = 0; i < this.children.length; ++i) {\n        var child = this.children[i], sz = child.chunkSize();\n        if (at <= sz) {\n          child.insertInner(at, lines, height);\n          if (child.lines && child.lines.length > 50) {\n            // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.\n            // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.\n            var remaining = child.lines.length % 25 + 25;\n            for (var pos = remaining; pos < child.lines.length;) {\n              var leaf = new LeafChunk(child.lines.slice(pos, pos += 25));\n              child.height -= leaf.height;\n              this.children.splice(++i, 0, leaf);\n              leaf.parent = this;\n            }\n            child.lines = child.lines.slice(0, remaining);\n            this.maybeSpill();\n          }\n          break\n        }\n        at -= sz;\n      }\n    },\n\n    // When a node has grown, check whether it should be split.\n    maybeSpill: function() {\n      if (this.children.length <= 10) { return }\n      var me = this;\n      do {\n        var spilled = me.children.splice(me.children.length - 5, 5);\n        var sibling = new BranchChunk(spilled);\n        if (!me.parent) { // Become the parent node\n          var copy = new BranchChunk(me.children);\n          copy.parent = me;\n          me.children = [copy, sibling];\n          me = copy;\n       } else {\n          me.size -= sibling.size;\n          me.height -= sibling.height;\n          var myIndex = indexOf(me.parent.children, me);\n          me.parent.children.splice(myIndex + 1, 0, sibling);\n        }\n        sibling.parent = me.parent;\n      } while (me.children.length > 10)\n      me.parent.maybeSpill();\n    },\n\n    iterN: function(at, n, op) {\n      for (var i = 0; i < this.children.length; ++i) {\n        var child = this.children[i], sz = child.chunkSize();\n        if (at < sz) {\n          var used = Math.min(n, sz - at);\n          if (child.iterN(at, used, op)) { return true }\n          if ((n -= used) == 0) { break }\n          at = 0;\n        } else { at -= sz; }\n      }\n    }\n  };\n\n  // Line widgets are block elements displayed above or below a line.\n\n  var LineWidget = function(doc, node, options) {\n    if (options) { for (var opt in options) { if (options.hasOwnProperty(opt))\n      { this[opt] = options[opt]; } } }\n    this.doc = doc;\n    this.node = node;\n  };\n\n  LineWidget.prototype.clear = function () {\n    var cm = this.doc.cm, ws = this.line.widgets, line = this.line, no = lineNo(line);\n    if (no == null || !ws) { return }\n    for (var i = 0; i < ws.length; ++i) { if (ws[i] == this) { ws.splice(i--, 1); } }\n    if (!ws.length) { line.widgets = null; }\n    var height = widgetHeight(this);\n    updateLineHeight(line, Math.max(0, line.height - height));\n    if (cm) {\n      runInOp(cm, function () {\n        adjustScrollWhenAboveVisible(cm, line, -height);\n        regLineChange(cm, no, \"widget\");\n      });\n      signalLater(cm, \"lineWidgetCleared\", cm, this, no);\n    }\n  };\n\n  LineWidget.prototype.changed = function () {\n      var this$1 = this;\n\n    var oldH = this.height, cm = this.doc.cm, line = this.line;\n    this.height = null;\n    var diff = widgetHeight(this) - oldH;\n    if (!diff) { return }\n    if (!lineIsHidden(this.doc, line)) { updateLineHeight(line, line.height + diff); }\n    if (cm) {\n      runInOp(cm, function () {\n        cm.curOp.forceUpdate = true;\n        adjustScrollWhenAboveVisible(cm, line, diff);\n        signalLater(cm, \"lineWidgetChanged\", cm, this$1, lineNo(line));\n      });\n    }\n  };\n  eventMixin(LineWidget);\n\n  function adjustScrollWhenAboveVisible(cm, line, diff) {\n    if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop))\n      { addToScrollTop(cm, diff); }\n  }\n\n  function addLineWidget(doc, handle, node, options) {\n    var widget = new LineWidget(doc, node, options);\n    var cm = doc.cm;\n    if (cm && widget.noHScroll) { cm.display.alignWidgets = true; }\n    changeLine(doc, handle, \"widget\", function (line) {\n      var widgets = line.widgets || (line.widgets = []);\n      if (widget.insertAt == null) { widgets.push(widget); }\n      else { widgets.splice(Math.min(widgets.length, Math.max(0, widget.insertAt)), 0, widget); }\n      widget.line = line;\n      if (cm && !lineIsHidden(doc, line)) {\n        var aboveVisible = heightAtLine(line) < doc.scrollTop;\n        updateLineHeight(line, line.height + widgetHeight(widget));\n        if (aboveVisible) { addToScrollTop(cm, widget.height); }\n        cm.curOp.forceUpdate = true;\n      }\n      return true\n    });\n    if (cm) { signalLater(cm, \"lineWidgetAdded\", cm, widget, typeof handle == \"number\" ? handle : lineNo(handle)); }\n    return widget\n  }\n\n  // TEXTMARKERS\n\n  // Created with markText and setBookmark methods. A TextMarker is a\n  // handle that can be used to clear or find a marked position in the\n  // document. Line objects hold arrays (markedSpans) containing\n  // {from, to, marker} object pointing to such marker objects, and\n  // indicating that such a marker is present on that line. Multiple\n  // lines may point to the same marker when it spans across lines.\n  // The spans will have null for their from/to properties when the\n  // marker continues beyond the start/end of the line. Markers have\n  // links back to the lines they currently touch.\n\n  // Collapsed markers have unique ids, in order to be able to order\n  // them, which is needed for uniquely determining an outer marker\n  // when they overlap (they may nest, but not partially overlap).\n  var nextMarkerId = 0;\n\n  var TextMarker = function(doc, type) {\n    this.lines = [];\n    this.type = type;\n    this.doc = doc;\n    this.id = ++nextMarkerId;\n  };\n\n  // Clear the marker.\n  TextMarker.prototype.clear = function () {\n    if (this.explicitlyCleared) { return }\n    var cm = this.doc.cm, withOp = cm && !cm.curOp;\n    if (withOp) { startOperation(cm); }\n    if (hasHandler(this, \"clear\")) {\n      var found = this.find();\n      if (found) { signalLater(this, \"clear\", found.from, found.to); }\n    }\n    var min = null, max = null;\n    for (var i = 0; i < this.lines.length; ++i) {\n      var line = this.lines[i];\n      var span = getMarkedSpanFor(line.markedSpans, this);\n      if (cm && !this.collapsed) { regLineChange(cm, lineNo(line), \"text\"); }\n      else if (cm) {\n        if (span.to != null) { max = lineNo(line); }\n        if (span.from != null) { min = lineNo(line); }\n      }\n      line.markedSpans = removeMarkedSpan(line.markedSpans, span);\n      if (span.from == null && this.collapsed && !lineIsHidden(this.doc, line) && cm)\n        { updateLineHeight(line, textHeight(cm.display)); }\n    }\n    if (cm && this.collapsed && !cm.options.lineWrapping) { for (var i$1 = 0; i$1 < this.lines.length; ++i$1) {\n      var visual = visualLine(this.lines[i$1]), len = lineLength(visual);\n      if (len > cm.display.maxLineLength) {\n        cm.display.maxLine = visual;\n        cm.display.maxLineLength = len;\n        cm.display.maxLineChanged = true;\n      }\n    } }\n\n    if (min != null && cm && this.collapsed) { regChange(cm, min, max + 1); }\n    this.lines.length = 0;\n    this.explicitlyCleared = true;\n    if (this.atomic && this.doc.cantEdit) {\n      this.doc.cantEdit = false;\n      if (cm) { reCheckSelection(cm.doc); }\n    }\n    if (cm) { signalLater(cm, \"markerCleared\", cm, this, min, max); }\n    if (withOp) { endOperation(cm); }\n    if (this.parent) { this.parent.clear(); }\n  };\n\n  // Find the position of the marker in the document. Returns a {from,\n  // to} object by default. Side can be passed to get a specific side\n  // -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the\n  // Pos objects returned contain a line object, rather than a line\n  // number (used to prevent looking up the same line twice).\n  TextMarker.prototype.find = function (side, lineObj) {\n    if (side == null && this.type == \"bookmark\") { side = 1; }\n    var from, to;\n    for (var i = 0; i < this.lines.length; ++i) {\n      var line = this.lines[i];\n      var span = getMarkedSpanFor(line.markedSpans, this);\n      if (span.from != null) {\n        from = Pos(lineObj ? line : lineNo(line), span.from);\n        if (side == -1) { return from }\n      }\n      if (span.to != null) {\n        to = Pos(lineObj ? line : lineNo(line), span.to);\n        if (side == 1) { return to }\n      }\n    }\n    return from && {from: from, to: to}\n  };\n\n  // Signals that the marker's widget changed, and surrounding layout\n  // should be recomputed.\n  TextMarker.prototype.changed = function () {\n      var this$1 = this;\n\n    var pos = this.find(-1, true), widget = this, cm = this.doc.cm;\n    if (!pos || !cm) { return }\n    runInOp(cm, function () {\n      var line = pos.line, lineN = lineNo(pos.line);\n      var view = findViewForLine(cm, lineN);\n      if (view) {\n        clearLineMeasurementCacheFor(view);\n        cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;\n      }\n      cm.curOp.updateMaxLine = true;\n      if (!lineIsHidden(widget.doc, line) && widget.height != null) {\n        var oldHeight = widget.height;\n        widget.height = null;\n        var dHeight = widgetHeight(widget) - oldHeight;\n        if (dHeight)\n          { updateLineHeight(line, line.height + dHeight); }\n      }\n      signalLater(cm, \"markerChanged\", cm, this$1);\n    });\n  };\n\n  TextMarker.prototype.attachLine = function (line) {\n    if (!this.lines.length && this.doc.cm) {\n      var op = this.doc.cm.curOp;\n      if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)\n        { (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this); }\n    }\n    this.lines.push(line);\n  };\n\n  TextMarker.prototype.detachLine = function (line) {\n    this.lines.splice(indexOf(this.lines, line), 1);\n    if (!this.lines.length && this.doc.cm) {\n      var op = this.doc.cm.curOp\n      ;(op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);\n    }\n  };\n  eventMixin(TextMarker);\n\n  // Create a marker, wire it up to the right lines, and\n  function markText(doc, from, to, options, type) {\n    // Shared markers (across linked documents) are handled separately\n    // (markTextShared will call out to this again, once per\n    // document).\n    if (options && options.shared) { return markTextShared(doc, from, to, options, type) }\n    // Ensure we are in an operation.\n    if (doc.cm && !doc.cm.curOp) { return operation(doc.cm, markText)(doc, from, to, options, type) }\n\n    var marker = new TextMarker(doc, type), diff = cmp(from, to);\n    if (options) { copyObj(options, marker, false); }\n    // Don't connect empty markers unless clearWhenEmpty is false\n    if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false)\n      { return marker }\n    if (marker.replacedWith) {\n      // Showing up as a widget implies collapsed (widget replaces text)\n      marker.collapsed = true;\n      marker.widgetNode = eltP(\"span\", [marker.replacedWith], \"CodeMirror-widget\");\n      if (!options.handleMouseEvents) { marker.widgetNode.setAttribute(\"cm-ignore-events\", \"true\"); }\n      if (options.insertLeft) { marker.widgetNode.insertLeft = true; }\n    }\n    if (marker.collapsed) {\n      if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||\n          from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker))\n        { throw new Error(\"Inserting collapsed marker partially overlapping an existing one\") }\n      seeCollapsedSpans();\n    }\n\n    if (marker.addToHistory)\n      { addChangeToHistory(doc, {from: from, to: to, origin: \"markText\"}, doc.sel, NaN); }\n\n    var curLine = from.line, cm = doc.cm, updateMaxLine;\n    doc.iter(curLine, to.line + 1, function (line) {\n      if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine)\n        { updateMaxLine = true; }\n      if (marker.collapsed && curLine != from.line) { updateLineHeight(line, 0); }\n      addMarkedSpan(line, new MarkedSpan(marker,\n                                         curLine == from.line ? from.ch : null,\n                                         curLine == to.line ? to.ch : null), doc.cm && doc.cm.curOp);\n      ++curLine;\n    });\n    // lineIsHidden depends on the presence of the spans, so needs a second pass\n    if (marker.collapsed) { doc.iter(from.line, to.line + 1, function (line) {\n      if (lineIsHidden(doc, line)) { updateLineHeight(line, 0); }\n    }); }\n\n    if (marker.clearOnEnter) { on(marker, \"beforeCursorEnter\", function () { return marker.clear(); }); }\n\n    if (marker.readOnly) {\n      seeReadOnlySpans();\n      if (doc.history.done.length || doc.history.undone.length)\n        { doc.clearHistory(); }\n    }\n    if (marker.collapsed) {\n      marker.id = ++nextMarkerId;\n      marker.atomic = true;\n    }\n    if (cm) {\n      // Sync editor state\n      if (updateMaxLine) { cm.curOp.updateMaxLine = true; }\n      if (marker.collapsed)\n        { regChange(cm, from.line, to.line + 1); }\n      else if (marker.className || marker.startStyle || marker.endStyle || marker.css ||\n               marker.attributes || marker.title)\n        { for (var i = from.line; i <= to.line; i++) { regLineChange(cm, i, \"text\"); } }\n      if (marker.atomic) { reCheckSelection(cm.doc); }\n      signalLater(cm, \"markerAdded\", cm, marker);\n    }\n    return marker\n  }\n\n  // SHARED TEXTMARKERS\n\n  // A shared marker spans multiple linked documents. It is\n  // implemented as a meta-marker-object controlling multiple normal\n  // markers.\n  var SharedTextMarker = function(markers, primary) {\n    this.markers = markers;\n    this.primary = primary;\n    for (var i = 0; i < markers.length; ++i)\n      { markers[i].parent = this; }\n  };\n\n  SharedTextMarker.prototype.clear = function () {\n    if (this.explicitlyCleared) { return }\n    this.explicitlyCleared = true;\n    for (var i = 0; i < this.markers.length; ++i)\n      { this.markers[i].clear(); }\n    signalLater(this, \"clear\");\n  };\n\n  SharedTextMarker.prototype.find = function (side, lineObj) {\n    return this.primary.find(side, lineObj)\n  };\n  eventMixin(SharedTextMarker);\n\n  function markTextShared(doc, from, to, options, type) {\n    options = copyObj(options);\n    options.shared = false;\n    var markers = [markText(doc, from, to, options, type)], primary = markers[0];\n    var widget = options.widgetNode;\n    linkedDocs(doc, function (doc) {\n      if (widget) { options.widgetNode = widget.cloneNode(true); }\n      markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));\n      for (var i = 0; i < doc.linked.length; ++i)\n        { if (doc.linked[i].isParent) { return } }\n      primary = lst(markers);\n    });\n    return new SharedTextMarker(markers, primary)\n  }\n\n  function findSharedMarkers(doc) {\n    return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())), function (m) { return m.parent; })\n  }\n\n  function copySharedMarkers(doc, markers) {\n    for (var i = 0; i < markers.length; i++) {\n      var marker = markers[i], pos = marker.find();\n      var mFrom = doc.clipPos(pos.from), mTo = doc.clipPos(pos.to);\n      if (cmp(mFrom, mTo)) {\n        var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type);\n        marker.markers.push(subMark);\n        subMark.parent = marker;\n      }\n    }\n  }\n\n  function detachSharedMarkers(markers) {\n    var loop = function ( i ) {\n      var marker = markers[i], linked = [marker.primary.doc];\n      linkedDocs(marker.primary.doc, function (d) { return linked.push(d); });\n      for (var j = 0; j < marker.markers.length; j++) {\n        var subMarker = marker.markers[j];\n        if (indexOf(linked, subMarker.doc) == -1) {\n          subMarker.parent = null;\n          marker.markers.splice(j--, 1);\n        }\n      }\n    };\n\n    for (var i = 0; i < markers.length; i++) loop( i );\n  }\n\n  var nextDocId = 0;\n  var Doc = function(text, mode, firstLine, lineSep, direction) {\n    if (!(this instanceof Doc)) { return new Doc(text, mode, firstLine, lineSep, direction) }\n    if (firstLine == null) { firstLine = 0; }\n\n    BranchChunk.call(this, [new LeafChunk([new Line(\"\", null)])]);\n    this.first = firstLine;\n    this.scrollTop = this.scrollLeft = 0;\n    this.cantEdit = false;\n    this.cleanGeneration = 1;\n    this.modeFrontier = this.highlightFrontier = firstLine;\n    var start = Pos(firstLine, 0);\n    this.sel = simpleSelection(start);\n    this.history = new History(null);\n    this.id = ++nextDocId;\n    this.modeOption = mode;\n    this.lineSep = lineSep;\n    this.direction = (direction == \"rtl\") ? \"rtl\" : \"ltr\";\n    this.extend = false;\n\n    if (typeof text == \"string\") { text = this.splitLines(text); }\n    updateDoc(this, {from: start, to: start, text: text});\n    setSelection(this, simpleSelection(start), sel_dontScroll);\n  };\n\n  Doc.prototype = createObj(BranchChunk.prototype, {\n    constructor: Doc,\n    // Iterate over the document. Supports two forms -- with only one\n    // argument, it calls that for each line in the document. With\n    // three, it iterates over the range given by the first two (with\n    // the second being non-inclusive).\n    iter: function(from, to, op) {\n      if (op) { this.iterN(from - this.first, to - from, op); }\n      else { this.iterN(this.first, this.first + this.size, from); }\n    },\n\n    // Non-public interface for adding and removing lines.\n    insert: function(at, lines) {\n      var height = 0;\n      for (var i = 0; i < lines.length; ++i) { height += lines[i].height; }\n      this.insertInner(at - this.first, lines, height);\n    },\n    remove: function(at, n) { this.removeInner(at - this.first, n); },\n\n    // From here, the methods are part of the public interface. Most\n    // are also available from CodeMirror (editor) instances.\n\n    getValue: function(lineSep) {\n      var lines = getLines(this, this.first, this.first + this.size);\n      if (lineSep === false) { return lines }\n      return lines.join(lineSep || this.lineSeparator())\n    },\n    setValue: docMethodOp(function(code) {\n      var top = Pos(this.first, 0), last = this.first + this.size - 1;\n      makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),\n                        text: this.splitLines(code), origin: \"setValue\", full: true}, true);\n      if (this.cm) { scrollToCoords(this.cm, 0, 0); }\n      setSelection(this, simpleSelection(top), sel_dontScroll);\n    }),\n    replaceRange: function(code, from, to, origin) {\n      from = clipPos(this, from);\n      to = to ? clipPos(this, to) : from;\n      replaceRange(this, code, from, to, origin);\n    },\n    getRange: function(from, to, lineSep) {\n      var lines = getBetween(this, clipPos(this, from), clipPos(this, to));\n      if (lineSep === false) { return lines }\n      return lines.join(lineSep || this.lineSeparator())\n    },\n\n    getLine: function(line) {var l = this.getLineHandle(line); return l && l.text},\n\n    getLineHandle: function(line) {if (isLine(this, line)) { return getLine(this, line) }},\n    getLineNumber: function(line) {return lineNo(line)},\n\n    getLineHandleVisualStart: function(line) {\n      if (typeof line == \"number\") { line = getLine(this, line); }\n      return visualLine(line)\n    },\n\n    lineCount: function() {return this.size},\n    firstLine: function() {return this.first},\n    lastLine: function() {return this.first + this.size - 1},\n\n    clipPos: function(pos) {return clipPos(this, pos)},\n\n    getCursor: function(start) {\n      var range = this.sel.primary(), pos;\n      if (start == null || start == \"head\") { pos = range.head; }\n      else if (start == \"anchor\") { pos = range.anchor; }\n      else if (start == \"end\" || start == \"to\" || start === false) { pos = range.to(); }\n      else { pos = range.from(); }\n      return pos\n    },\n    listSelections: function() { return this.sel.ranges },\n    somethingSelected: function() {return this.sel.somethingSelected()},\n\n    setCursor: docMethodOp(function(line, ch, options) {\n      setSimpleSelection(this, clipPos(this, typeof line == \"number\" ? Pos(line, ch || 0) : line), null, options);\n    }),\n    setSelection: docMethodOp(function(anchor, head, options) {\n      setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options);\n    }),\n    extendSelection: docMethodOp(function(head, other, options) {\n      extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);\n    }),\n    extendSelections: docMethodOp(function(heads, options) {\n      extendSelections(this, clipPosArray(this, heads), options);\n    }),\n    extendSelectionsBy: docMethodOp(function(f, options) {\n      var heads = map(this.sel.ranges, f);\n      extendSelections(this, clipPosArray(this, heads), options);\n    }),\n    setSelections: docMethodOp(function(ranges, primary, options) {\n      if (!ranges.length) { return }\n      var out = [];\n      for (var i = 0; i < ranges.length; i++)\n        { out[i] = new Range(clipPos(this, ranges[i].anchor),\n                           clipPos(this, ranges[i].head || ranges[i].anchor)); }\n      if (primary == null) { primary = Math.min(ranges.length - 1, this.sel.primIndex); }\n      setSelection(this, normalizeSelection(this.cm, out, primary), options);\n    }),\n    addSelection: docMethodOp(function(anchor, head, options) {\n      var ranges = this.sel.ranges.slice(0);\n      ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)));\n      setSelection(this, normalizeSelection(this.cm, ranges, ranges.length - 1), options);\n    }),\n\n    getSelection: function(lineSep) {\n      var ranges = this.sel.ranges, lines;\n      for (var i = 0; i < ranges.length; i++) {\n        var sel = getBetween(this, ranges[i].from(), ranges[i].to());\n        lines = lines ? lines.concat(sel) : sel;\n      }\n      if (lineSep === false) { return lines }\n      else { return lines.join(lineSep || this.lineSeparator()) }\n    },\n    getSelections: function(lineSep) {\n      var parts = [], ranges = this.sel.ranges;\n      for (var i = 0; i < ranges.length; i++) {\n        var sel = getBetween(this, ranges[i].from(), ranges[i].to());\n        if (lineSep !== false) { sel = sel.join(lineSep || this.lineSeparator()); }\n        parts[i] = sel;\n      }\n      return parts\n    },\n    replaceSelection: function(code, collapse, origin) {\n      var dup = [];\n      for (var i = 0; i < this.sel.ranges.length; i++)\n        { dup[i] = code; }\n      this.replaceSelections(dup, collapse, origin || \"+input\");\n    },\n    replaceSelections: docMethodOp(function(code, collapse, origin) {\n      var changes = [], sel = this.sel;\n      for (var i = 0; i < sel.ranges.length; i++) {\n        var range = sel.ranges[i];\n        changes[i] = {from: range.from(), to: range.to(), text: this.splitLines(code[i]), origin: origin};\n      }\n      var newSel = collapse && collapse != \"end\" && computeReplacedSel(this, changes, collapse);\n      for (var i$1 = changes.length - 1; i$1 >= 0; i$1--)\n        { makeChange(this, changes[i$1]); }\n      if (newSel) { setSelectionReplaceHistory(this, newSel); }\n      else if (this.cm) { ensureCursorVisible(this.cm); }\n    }),\n    undo: docMethodOp(function() {makeChangeFromHistory(this, \"undo\");}),\n    redo: docMethodOp(function() {makeChangeFromHistory(this, \"redo\");}),\n    undoSelection: docMethodOp(function() {makeChangeFromHistory(this, \"undo\", true);}),\n    redoSelection: docMethodOp(function() {makeChangeFromHistory(this, \"redo\", true);}),\n\n    setExtending: function(val) {this.extend = val;},\n    getExtending: function() {return this.extend},\n\n    historySize: function() {\n      var hist = this.history, done = 0, undone = 0;\n      for (var i = 0; i < hist.done.length; i++) { if (!hist.done[i].ranges) { ++done; } }\n      for (var i$1 = 0; i$1 < hist.undone.length; i$1++) { if (!hist.undone[i$1].ranges) { ++undone; } }\n      return {undo: done, redo: undone}\n    },\n    clearHistory: function() {\n      var this$1 = this;\n\n      this.history = new History(this.history);\n      linkedDocs(this, function (doc) { return doc.history = this$1.history; }, true);\n    },\n\n    markClean: function() {\n      this.cleanGeneration = this.changeGeneration(true);\n    },\n    changeGeneration: function(forceSplit) {\n      if (forceSplit)\n        { this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null; }\n      return this.history.generation\n    },\n    isClean: function (gen) {\n      return this.history.generation == (gen || this.cleanGeneration)\n    },\n\n    getHistory: function() {\n      return {done: copyHistoryArray(this.history.done),\n              undone: copyHistoryArray(this.history.undone)}\n    },\n    setHistory: function(histData) {\n      var hist = this.history = new History(this.history);\n      hist.done = copyHistoryArray(histData.done.slice(0), null, true);\n      hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);\n    },\n\n    setGutterMarker: docMethodOp(function(line, gutterID, value) {\n      return changeLine(this, line, \"gutter\", function (line) {\n        var markers = line.gutterMarkers || (line.gutterMarkers = {});\n        markers[gutterID] = value;\n        if (!value && isEmpty(markers)) { line.gutterMarkers = null; }\n        return true\n      })\n    }),\n\n    clearGutter: docMethodOp(function(gutterID) {\n      var this$1 = this;\n\n      this.iter(function (line) {\n        if (line.gutterMarkers && line.gutterMarkers[gutterID]) {\n          changeLine(this$1, line, \"gutter\", function () {\n            line.gutterMarkers[gutterID] = null;\n            if (isEmpty(line.gutterMarkers)) { line.gutterMarkers = null; }\n            return true\n          });\n        }\n      });\n    }),\n\n    lineInfo: function(line) {\n      var n;\n      if (typeof line == \"number\") {\n        if (!isLine(this, line)) { return null }\n        n = line;\n        line = getLine(this, line);\n        if (!line) { return null }\n      } else {\n        n = lineNo(line);\n        if (n == null) { return null }\n      }\n      return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,\n              textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,\n              widgets: line.widgets}\n    },\n\n    addLineClass: docMethodOp(function(handle, where, cls) {\n      return changeLine(this, handle, where == \"gutter\" ? \"gutter\" : \"class\", function (line) {\n        var prop = where == \"text\" ? \"textClass\"\n                 : where == \"background\" ? \"bgClass\"\n                 : where == \"gutter\" ? \"gutterClass\" : \"wrapClass\";\n        if (!line[prop]) { line[prop] = cls; }\n        else if (classTest(cls).test(line[prop])) { return false }\n        else { line[prop] += \" \" + cls; }\n        return true\n      })\n    }),\n    removeLineClass: docMethodOp(function(handle, where, cls) {\n      return changeLine(this, handle, where == \"gutter\" ? \"gutter\" : \"class\", function (line) {\n        var prop = where == \"text\" ? \"textClass\"\n                 : where == \"background\" ? \"bgClass\"\n                 : where == \"gutter\" ? \"gutterClass\" : \"wrapClass\";\n        var cur = line[prop];\n        if (!cur) { return false }\n        else if (cls == null) { line[prop] = null; }\n        else {\n          var found = cur.match(classTest(cls));\n          if (!found) { return false }\n          var end = found.index + found[0].length;\n          line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? \"\" : \" \") + cur.slice(end) || null;\n        }\n        return true\n      })\n    }),\n\n    addLineWidget: docMethodOp(function(handle, node, options) {\n      return addLineWidget(this, handle, node, options)\n    }),\n    removeLineWidget: function(widget) { widget.clear(); },\n\n    markText: function(from, to, options) {\n      return markText(this, clipPos(this, from), clipPos(this, to), options, options && options.type || \"range\")\n    },\n    setBookmark: function(pos, options) {\n      var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),\n                      insertLeft: options && options.insertLeft,\n                      clearWhenEmpty: false, shared: options && options.shared,\n                      handleMouseEvents: options && options.handleMouseEvents};\n      pos = clipPos(this, pos);\n      return markText(this, pos, pos, realOpts, \"bookmark\")\n    },\n    findMarksAt: function(pos) {\n      pos = clipPos(this, pos);\n      var markers = [], spans = getLine(this, pos.line).markedSpans;\n      if (spans) { for (var i = 0; i < spans.length; ++i) {\n        var span = spans[i];\n        if ((span.from == null || span.from <= pos.ch) &&\n            (span.to == null || span.to >= pos.ch))\n          { markers.push(span.marker.parent || span.marker); }\n      } }\n      return markers\n    },\n    findMarks: function(from, to, filter) {\n      from = clipPos(this, from); to = clipPos(this, to);\n      var found = [], lineNo = from.line;\n      this.iter(from.line, to.line + 1, function (line) {\n        var spans = line.markedSpans;\n        if (spans) { for (var i = 0; i < spans.length; i++) {\n          var span = spans[i];\n          if (!(span.to != null && lineNo == from.line && from.ch >= span.to ||\n                span.from == null && lineNo != from.line ||\n                span.from != null && lineNo == to.line && span.from >= to.ch) &&\n              (!filter || filter(span.marker)))\n            { found.push(span.marker.parent || span.marker); }\n        } }\n        ++lineNo;\n      });\n      return found\n    },\n    getAllMarks: function() {\n      var markers = [];\n      this.iter(function (line) {\n        var sps = line.markedSpans;\n        if (sps) { for (var i = 0; i < sps.length; ++i)\n          { if (sps[i].from != null) { markers.push(sps[i].marker); } } }\n      });\n      return markers\n    },\n\n    posFromIndex: function(off) {\n      var ch, lineNo = this.first, sepSize = this.lineSeparator().length;\n      this.iter(function (line) {\n        var sz = line.text.length + sepSize;\n        if (sz > off) { ch = off; return true }\n        off -= sz;\n        ++lineNo;\n      });\n      return clipPos(this, Pos(lineNo, ch))\n    },\n    indexFromPos: function (coords) {\n      coords = clipPos(this, coords);\n      var index = coords.ch;\n      if (coords.line < this.first || coords.ch < 0) { return 0 }\n      var sepSize = this.lineSeparator().length;\n      this.iter(this.first, coords.line, function (line) { // iter aborts when callback returns a truthy value\n        index += line.text.length + sepSize;\n      });\n      return index\n    },\n\n    copy: function(copyHistory) {\n      var doc = new Doc(getLines(this, this.first, this.first + this.size),\n                        this.modeOption, this.first, this.lineSep, this.direction);\n      doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;\n      doc.sel = this.sel;\n      doc.extend = false;\n      if (copyHistory) {\n        doc.history.undoDepth = this.history.undoDepth;\n        doc.setHistory(this.getHistory());\n      }\n      return doc\n    },\n\n    linkedDoc: function(options) {\n      if (!options) { options = {}; }\n      var from = this.first, to = this.first + this.size;\n      if (options.from != null && options.from > from) { from = options.from; }\n      if (options.to != null && options.to < to) { to = options.to; }\n      var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep, this.direction);\n      if (options.sharedHist) { copy.history = this.history\n      ; }(this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});\n      copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}];\n      copySharedMarkers(copy, findSharedMarkers(this));\n      return copy\n    },\n    unlinkDoc: function(other) {\n      if (other instanceof CodeMirror) { other = other.doc; }\n      if (this.linked) { for (var i = 0; i < this.linked.length; ++i) {\n        var link = this.linked[i];\n        if (link.doc != other) { continue }\n        this.linked.splice(i, 1);\n        other.unlinkDoc(this);\n        detachSharedMarkers(findSharedMarkers(this));\n        break\n      } }\n      // If the histories were shared, split them again\n      if (other.history == this.history) {\n        var splitIds = [other.id];\n        linkedDocs(other, function (doc) { return splitIds.push(doc.id); }, true);\n        other.history = new History(null);\n        other.history.done = copyHistoryArray(this.history.done, splitIds);\n        other.history.undone = copyHistoryArray(this.history.undone, splitIds);\n      }\n    },\n    iterLinkedDocs: function(f) {linkedDocs(this, f);},\n\n    getMode: function() {return this.mode},\n    getEditor: function() {return this.cm},\n\n    splitLines: function(str) {\n      if (this.lineSep) { return str.split(this.lineSep) }\n      return splitLinesAuto(str)\n    },\n    lineSeparator: function() { return this.lineSep || \"\\n\" },\n\n    setDirection: docMethodOp(function (dir) {\n      if (dir != \"rtl\") { dir = \"ltr\"; }\n      if (dir == this.direction) { return }\n      this.direction = dir;\n      this.iter(function (line) { return line.order = null; });\n      if (this.cm) { directionChanged(this.cm); }\n    })\n  });\n\n  // Public alias.\n  Doc.prototype.eachLine = Doc.prototype.iter;\n\n  // Kludge to work around strange IE behavior where it'll sometimes\n  // re-fire a series of drag-related events right after the drop (#1551)\n  var lastDrop = 0;\n\n  function onDrop(e) {\n    var cm = this;\n    clearDragCursor(cm);\n    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e))\n      { return }\n    e_preventDefault(e);\n    if (ie) { lastDrop = +new Date; }\n    var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;\n    if (!pos || cm.isReadOnly()) { return }\n    // Might be a file drop, in which case we simply extract the text\n    // and insert it.\n    if (files && files.length && window.FileReader && window.File) {\n      var n = files.length, text = Array(n), read = 0;\n      var markAsReadAndPasteIfAllFilesAreRead = function () {\n        if (++read == n) {\n          operation(cm, function () {\n            pos = clipPos(cm.doc, pos);\n            var change = {from: pos, to: pos,\n                          text: cm.doc.splitLines(\n                              text.filter(function (t) { return t != null; }).join(cm.doc.lineSeparator())),\n                          origin: \"paste\"};\n            makeChange(cm.doc, change);\n            setSelectionReplaceHistory(cm.doc, simpleSelection(clipPos(cm.doc, pos), clipPos(cm.doc, changeEnd(change))));\n          })();\n        }\n      };\n      var readTextFromFile = function (file, i) {\n        if (cm.options.allowDropFileTypes &&\n            indexOf(cm.options.allowDropFileTypes, file.type) == -1) {\n          markAsReadAndPasteIfAllFilesAreRead();\n          return\n        }\n        var reader = new FileReader;\n        reader.onerror = function () { return markAsReadAndPasteIfAllFilesAreRead(); };\n        reader.onload = function () {\n          var content = reader.result;\n          if (/[\\x00-\\x08\\x0e-\\x1f]{2}/.test(content)) {\n            markAsReadAndPasteIfAllFilesAreRead();\n            return\n          }\n          text[i] = content;\n          markAsReadAndPasteIfAllFilesAreRead();\n        };\n        reader.readAsText(file);\n      };\n      for (var i = 0; i < files.length; i++) { readTextFromFile(files[i], i); }\n    } else { // Normal drop\n      // Don't do a replace if the drop happened inside of the selected text.\n      if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {\n        cm.state.draggingText(e);\n        // Ensure the editor is re-focused\n        setTimeout(function () { return cm.display.input.focus(); }, 20);\n        return\n      }\n      try {\n        var text$1 = e.dataTransfer.getData(\"Text\");\n        if (text$1) {\n          var selected;\n          if (cm.state.draggingText && !cm.state.draggingText.copy)\n            { selected = cm.listSelections(); }\n          setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));\n          if (selected) { for (var i$1 = 0; i$1 < selected.length; ++i$1)\n            { replaceRange(cm.doc, \"\", selected[i$1].anchor, selected[i$1].head, \"drag\"); } }\n          cm.replaceSelection(text$1, \"around\", \"paste\");\n          cm.display.input.focus();\n        }\n      }\n      catch(e$1){}\n    }\n  }\n\n  function onDragStart(cm, e) {\n    if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return }\n    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) { return }\n\n    e.dataTransfer.setData(\"Text\", cm.getSelection());\n    e.dataTransfer.effectAllowed = \"copyMove\";\n\n    // Use dummy image instead of default browsers image.\n    // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.\n    if (e.dataTransfer.setDragImage && !safari) {\n      var img = elt(\"img\", null, null, \"position: fixed; left: 0; top: 0;\");\n      img.src = \"data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\";\n      if (presto) {\n        img.width = img.height = 1;\n        cm.display.wrapper.appendChild(img);\n        // Force a relayout, or Opera won't use our image for some obscure reason\n        img._top = img.offsetTop;\n      }\n      e.dataTransfer.setDragImage(img, 0, 0);\n      if (presto) { img.parentNode.removeChild(img); }\n    }\n  }\n\n  function onDragOver(cm, e) {\n    var pos = posFromMouse(cm, e);\n    if (!pos) { return }\n    var frag = document.createDocumentFragment();\n    drawSelectionCursor(cm, pos, frag);\n    if (!cm.display.dragCursor) {\n      cm.display.dragCursor = elt(\"div\", null, \"CodeMirror-cursors CodeMirror-dragcursors\");\n      cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv);\n    }\n    removeChildrenAndAdd(cm.display.dragCursor, frag);\n  }\n\n  function clearDragCursor(cm) {\n    if (cm.display.dragCursor) {\n      cm.display.lineSpace.removeChild(cm.display.dragCursor);\n      cm.display.dragCursor = null;\n    }\n  }\n\n  // These must be handled carefully, because naively registering a\n  // handler for each editor will cause the editors to never be\n  // garbage collected.\n\n  function forEachCodeMirror(f) {\n    if (!document.getElementsByClassName) { return }\n    var byClass = document.getElementsByClassName(\"CodeMirror\"), editors = [];\n    for (var i = 0; i < byClass.length; i++) {\n      var cm = byClass[i].CodeMirror;\n      if (cm) { editors.push(cm); }\n    }\n    if (editors.length) { editors[0].operation(function () {\n      for (var i = 0; i < editors.length; i++) { f(editors[i]); }\n    }); }\n  }\n\n  var globalsRegistered = false;\n  function ensureGlobalHandlers() {\n    if (globalsRegistered) { return }\n    registerGlobalHandlers();\n    globalsRegistered = true;\n  }\n  function registerGlobalHandlers() {\n    // When the window resizes, we need to refresh active editors.\n    var resizeTimer;\n    on(window, \"resize\", function () {\n      if (resizeTimer == null) { resizeTimer = setTimeout(function () {\n        resizeTimer = null;\n        forEachCodeMirror(onResize);\n      }, 100); }\n    });\n    // When the window loses focus, we want to show the editor as blurred\n    on(window, \"blur\", function () { return forEachCodeMirror(onBlur); });\n  }\n  // Called when the window resizes\n  function onResize(cm) {\n    var d = cm.display;\n    // Might be a text scaling operation, clear size caches.\n    d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;\n    d.scrollbarsClipped = false;\n    cm.setSize();\n  }\n\n  var keyNames = {\n    3: \"Pause\", 8: \"Backspace\", 9: \"Tab\", 13: \"Enter\", 16: \"Shift\", 17: \"Ctrl\", 18: \"Alt\",\n    19: \"Pause\", 20: \"CapsLock\", 27: \"Esc\", 32: \"Space\", 33: \"PageUp\", 34: \"PageDown\", 35: \"End\",\n    36: \"Home\", 37: \"Left\", 38: \"Up\", 39: \"Right\", 40: \"Down\", 44: \"PrintScrn\", 45: \"Insert\",\n    46: \"Delete\", 59: \";\", 61: \"=\", 91: \"Mod\", 92: \"Mod\", 93: \"Mod\",\n    106: \"*\", 107: \"=\", 109: \"-\", 110: \".\", 111: \"/\", 145: \"ScrollLock\",\n    173: \"-\", 186: \";\", 187: \"=\", 188: \",\", 189: \"-\", 190: \".\", 191: \"/\", 192: \"`\", 219: \"[\", 220: \"\\\\\",\n    221: \"]\", 222: \"'\", 224: \"Mod\", 63232: \"Up\", 63233: \"Down\", 63234: \"Left\", 63235: \"Right\", 63272: \"Delete\",\n    63273: \"Home\", 63275: \"End\", 63276: \"PageUp\", 63277: \"PageDown\", 63302: \"Insert\"\n  };\n\n  // Number keys\n  for (var i = 0; i < 10; i++) { keyNames[i + 48] = keyNames[i + 96] = String(i); }\n  // Alphabetic keys\n  for (var i$1 = 65; i$1 <= 90; i$1++) { keyNames[i$1] = String.fromCharCode(i$1); }\n  // Function keys\n  for (var i$2 = 1; i$2 <= 12; i$2++) { keyNames[i$2 + 111] = keyNames[i$2 + 63235] = \"F\" + i$2; }\n\n  var keyMap = {};\n\n  keyMap.basic = {\n    \"Left\": \"goCharLeft\", \"Right\": \"goCharRight\", \"Up\": \"goLineUp\", \"Down\": \"goLineDown\",\n    \"End\": \"goLineEnd\", \"Home\": \"goLineStartSmart\", \"PageUp\": \"goPageUp\", \"PageDown\": \"goPageDown\",\n    \"Delete\": \"delCharAfter\", \"Backspace\": \"delCharBefore\", \"Shift-Backspace\": \"delCharBefore\",\n    \"Tab\": \"defaultTab\", \"Shift-Tab\": \"indentAuto\",\n    \"Enter\": \"newlineAndIndent\", \"Insert\": \"toggleOverwrite\",\n    \"Esc\": \"singleSelection\"\n  };\n  // Note that the save and find-related commands aren't defined by\n  // default. User code or addons can define them. Unknown commands\n  // are simply ignored.\n  keyMap.pcDefault = {\n    \"Ctrl-A\": \"selectAll\", \"Ctrl-D\": \"deleteLine\", \"Ctrl-Z\": \"undo\", \"Shift-Ctrl-Z\": \"redo\", \"Ctrl-Y\": \"redo\",\n    \"Ctrl-Home\": \"goDocStart\", \"Ctrl-End\": \"goDocEnd\", \"Ctrl-Up\": \"goLineUp\", \"Ctrl-Down\": \"goLineDown\",\n    \"Ctrl-Left\": \"goGroupLeft\", \"Ctrl-Right\": \"goGroupRight\", \"Alt-Left\": \"goLineStart\", \"Alt-Right\": \"goLineEnd\",\n    \"Ctrl-Backspace\": \"delGroupBefore\", \"Ctrl-Delete\": \"delGroupAfter\", \"Ctrl-S\": \"save\", \"Ctrl-F\": \"find\",\n    \"Ctrl-G\": \"findNext\", \"Shift-Ctrl-G\": \"findPrev\", \"Shift-Ctrl-F\": \"replace\", \"Shift-Ctrl-R\": \"replaceAll\",\n    \"Ctrl-[\": \"indentLess\", \"Ctrl-]\": \"indentMore\",\n    \"Ctrl-U\": \"undoSelection\", \"Shift-Ctrl-U\": \"redoSelection\", \"Alt-U\": \"redoSelection\",\n    \"fallthrough\": \"basic\"\n  };\n  // Very basic readline/emacs-style bindings, which are standard on Mac.\n  keyMap.emacsy = {\n    \"Ctrl-F\": \"goCharRight\", \"Ctrl-B\": \"goCharLeft\", \"Ctrl-P\": \"goLineUp\", \"Ctrl-N\": \"goLineDown\",\n    \"Ctrl-A\": \"goLineStart\", \"Ctrl-E\": \"goLineEnd\", \"Ctrl-V\": \"goPageDown\", \"Shift-Ctrl-V\": \"goPageUp\",\n    \"Ctrl-D\": \"delCharAfter\", \"Ctrl-H\": \"delCharBefore\", \"Alt-Backspace\": \"delWordBefore\", \"Ctrl-K\": \"killLine\",\n    \"Ctrl-T\": \"transposeChars\", \"Ctrl-O\": \"openLine\"\n  };\n  keyMap.macDefault = {\n    \"Cmd-A\": \"selectAll\", \"Cmd-D\": \"deleteLine\", \"Cmd-Z\": \"undo\", \"Shift-Cmd-Z\": \"redo\", \"Cmd-Y\": \"redo\",\n    \"Cmd-Home\": \"goDocStart\", \"Cmd-Up\": \"goDocStart\", \"Cmd-End\": \"goDocEnd\", \"Cmd-Down\": \"goDocEnd\", \"Alt-Left\": \"goGroupLeft\",\n    \"Alt-Right\": \"goGroupRight\", \"Cmd-Left\": \"goLineLeft\", \"Cmd-Right\": \"goLineRight\", \"Alt-Backspace\": \"delGroupBefore\",\n    \"Ctrl-Alt-Backspace\": \"delGroupAfter\", \"Alt-Delete\": \"delGroupAfter\", \"Cmd-S\": \"save\", \"Cmd-F\": \"find\",\n    \"Cmd-G\": \"findNext\", \"Shift-Cmd-G\": \"findPrev\", \"Cmd-Alt-F\": \"replace\", \"Shift-Cmd-Alt-F\": \"replaceAll\",\n    \"Cmd-[\": \"indentLess\", \"Cmd-]\": \"indentMore\", \"Cmd-Backspace\": \"delWrappedLineLeft\", \"Cmd-Delete\": \"delWrappedLineRight\",\n    \"Cmd-U\": \"undoSelection\", \"Shift-Cmd-U\": \"redoSelection\", \"Ctrl-Up\": \"goDocStart\", \"Ctrl-Down\": \"goDocEnd\",\n    \"fallthrough\": [\"basic\", \"emacsy\"]\n  };\n  keyMap[\"default\"] = mac ? keyMap.macDefault : keyMap.pcDefault;\n\n  // KEYMAP DISPATCH\n\n  function normalizeKeyName(name) {\n    var parts = name.split(/-(?!$)/);\n    name = parts[parts.length - 1];\n    var alt, ctrl, shift, cmd;\n    for (var i = 0; i < parts.length - 1; i++) {\n      var mod = parts[i];\n      if (/^(cmd|meta|m)$/i.test(mod)) { cmd = true; }\n      else if (/^a(lt)?$/i.test(mod)) { alt = true; }\n      else if (/^(c|ctrl|control)$/i.test(mod)) { ctrl = true; }\n      else if (/^s(hift)?$/i.test(mod)) { shift = true; }\n      else { throw new Error(\"Unrecognized modifier name: \" + mod) }\n    }\n    if (alt) { name = \"Alt-\" + name; }\n    if (ctrl) { name = \"Ctrl-\" + name; }\n    if (cmd) { name = \"Cmd-\" + name; }\n    if (shift) { name = \"Shift-\" + name; }\n    return name\n  }\n\n  // This is a kludge to keep keymaps mostly working as raw objects\n  // (backwards compatibility) while at the same time support features\n  // like normalization and multi-stroke key bindings. It compiles a\n  // new normalized keymap, and then updates the old object to reflect\n  // this.\n  function normalizeKeyMap(keymap) {\n    var copy = {};\n    for (var keyname in keymap) { if (keymap.hasOwnProperty(keyname)) {\n      var value = keymap[keyname];\n      if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) { continue }\n      if (value == \"...\") { delete keymap[keyname]; continue }\n\n      var keys = map(keyname.split(\" \"), normalizeKeyName);\n      for (var i = 0; i < keys.length; i++) {\n        var val = (void 0), name = (void 0);\n        if (i == keys.length - 1) {\n          name = keys.join(\" \");\n          val = value;\n        } else {\n          name = keys.slice(0, i + 1).join(\" \");\n          val = \"...\";\n        }\n        var prev = copy[name];\n        if (!prev) { copy[name] = val; }\n        else if (prev != val) { throw new Error(\"Inconsistent bindings for \" + name) }\n      }\n      delete keymap[keyname];\n    } }\n    for (var prop in copy) { keymap[prop] = copy[prop]; }\n    return keymap\n  }\n\n  function lookupKey(key, map, handle, context) {\n    map = getKeyMap(map);\n    var found = map.call ? map.call(key, context) : map[key];\n    if (found === false) { return \"nothing\" }\n    if (found === \"...\") { return \"multi\" }\n    if (found != null && handle(found)) { return \"handled\" }\n\n    if (map.fallthrough) {\n      if (Object.prototype.toString.call(map.fallthrough) != \"[object Array]\")\n        { return lookupKey(key, map.fallthrough, handle, context) }\n      for (var i = 0; i < map.fallthrough.length; i++) {\n        var result = lookupKey(key, map.fallthrough[i], handle, context);\n        if (result) { return result }\n      }\n    }\n  }\n\n  // Modifier key presses don't count as 'real' key presses for the\n  // purpose of keymap fallthrough.\n  function isModifierKey(value) {\n    var name = typeof value == \"string\" ? value : keyNames[value.keyCode];\n    return name == \"Ctrl\" || name == \"Alt\" || name == \"Shift\" || name == \"Mod\"\n  }\n\n  function addModifierNames(name, event, noShift) {\n    var base = name;\n    if (event.altKey && base != \"Alt\") { name = \"Alt-\" + name; }\n    if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != \"Ctrl\") { name = \"Ctrl-\" + name; }\n    if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != \"Mod\") { name = \"Cmd-\" + name; }\n    if (!noShift && event.shiftKey && base != \"Shift\") { name = \"Shift-\" + name; }\n    return name\n  }\n\n  // Look up the name of a key as indicated by an event object.\n  function keyName(event, noShift) {\n    if (presto && event.keyCode == 34 && event[\"char\"]) { return false }\n    var name = keyNames[event.keyCode];\n    if (name == null || event.altGraphKey) { return false }\n    // Ctrl-ScrollLock has keyCode 3, same as Ctrl-Pause,\n    // so we'll use event.code when available (Chrome 48+, FF 38+, Safari 10.1+)\n    if (event.keyCode == 3 && event.code) { name = event.code; }\n    return addModifierNames(name, event, noShift)\n  }\n\n  function getKeyMap(val) {\n    return typeof val == \"string\" ? keyMap[val] : val\n  }\n\n  // Helper for deleting text near the selection(s), used to implement\n  // backspace, delete, and similar functionality.\n  function deleteNearSelection(cm, compute) {\n    var ranges = cm.doc.sel.ranges, kill = [];\n    // Build up a set of ranges to kill first, merging overlapping\n    // ranges.\n    for (var i = 0; i < ranges.length; i++) {\n      var toKill = compute(ranges[i]);\n      while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {\n        var replaced = kill.pop();\n        if (cmp(replaced.from, toKill.from) < 0) {\n          toKill.from = replaced.from;\n          break\n        }\n      }\n      kill.push(toKill);\n    }\n    // Next, remove those actual ranges.\n    runInOp(cm, function () {\n      for (var i = kill.length - 1; i >= 0; i--)\n        { replaceRange(cm.doc, \"\", kill[i].from, kill[i].to, \"+delete\"); }\n      ensureCursorVisible(cm);\n    });\n  }\n\n  function moveCharLogically(line, ch, dir) {\n    var target = skipExtendingChars(line.text, ch + dir, dir);\n    return target < 0 || target > line.text.length ? null : target\n  }\n\n  function moveLogically(line, start, dir) {\n    var ch = moveCharLogically(line, start.ch, dir);\n    return ch == null ? null : new Pos(start.line, ch, dir < 0 ? \"after\" : \"before\")\n  }\n\n  function endOfLine(visually, cm, lineObj, lineNo, dir) {\n    if (visually) {\n      if (cm.doc.direction == \"rtl\") { dir = -dir; }\n      var order = getOrder(lineObj, cm.doc.direction);\n      if (order) {\n        var part = dir < 0 ? lst(order) : order[0];\n        var moveInStorageOrder = (dir < 0) == (part.level == 1);\n        var sticky = moveInStorageOrder ? \"after\" : \"before\";\n        var ch;\n        // With a wrapped rtl chunk (possibly spanning multiple bidi parts),\n        // it could be that the last bidi part is not on the last visual line,\n        // since visual lines contain content order-consecutive chunks.\n        // Thus, in rtl, we are looking for the first (content-order) character\n        // in the rtl chunk that is on the last line (that is, the same line\n        // as the last (content-order) character).\n        if (part.level > 0 || cm.doc.direction == \"rtl\") {\n          var prep = prepareMeasureForLine(cm, lineObj);\n          ch = dir < 0 ? lineObj.text.length - 1 : 0;\n          var targetTop = measureCharPrepared(cm, prep, ch).top;\n          ch = findFirst(function (ch) { return measureCharPrepared(cm, prep, ch).top == targetTop; }, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch);\n          if (sticky == \"before\") { ch = moveCharLogically(lineObj, ch, 1); }\n        } else { ch = dir < 0 ? part.to : part.from; }\n        return new Pos(lineNo, ch, sticky)\n      }\n    }\n    return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? \"before\" : \"after\")\n  }\n\n  function moveVisually(cm, line, start, dir) {\n    var bidi = getOrder(line, cm.doc.direction);\n    if (!bidi) { return moveLogically(line, start, dir) }\n    if (start.ch >= line.text.length) {\n      start.ch = line.text.length;\n      start.sticky = \"before\";\n    } else if (start.ch <= 0) {\n      start.ch = 0;\n      start.sticky = \"after\";\n    }\n    var partPos = getBidiPartAt(bidi, start.ch, start.sticky), part = bidi[partPos];\n    if (cm.doc.direction == \"ltr\" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) {\n      // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,\n      // nothing interesting happens.\n      return moveLogically(line, start, dir)\n    }\n\n    var mv = function (pos, dir) { return moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir); };\n    var prep;\n    var getWrappedLineExtent = function (ch) {\n      if (!cm.options.lineWrapping) { return {begin: 0, end: line.text.length} }\n      prep = prep || prepareMeasureForLine(cm, line);\n      return wrappedLineExtentChar(cm, line, prep, ch)\n    };\n    var wrappedLineExtent = getWrappedLineExtent(start.sticky == \"before\" ? mv(start, -1) : start.ch);\n\n    if (cm.doc.direction == \"rtl\" || part.level == 1) {\n      var moveInStorageOrder = (part.level == 1) == (dir < 0);\n      var ch = mv(start, moveInStorageOrder ? 1 : -1);\n      if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) {\n        // Case 2: We move within an rtl part or in an rtl editor on the same visual line\n        var sticky = moveInStorageOrder ? \"before\" : \"after\";\n        return new Pos(start.line, ch, sticky)\n      }\n    }\n\n    // Case 3: Could not move within this bidi part in this visual line, so leave\n    // the current bidi part\n\n    var searchInVisualLine = function (partPos, dir, wrappedLineExtent) {\n      var getRes = function (ch, moveInStorageOrder) { return moveInStorageOrder\n        ? new Pos(start.line, mv(ch, 1), \"before\")\n        : new Pos(start.line, ch, \"after\"); };\n\n      for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {\n        var part = bidi[partPos];\n        var moveInStorageOrder = (dir > 0) == (part.level != 1);\n        var ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1);\n        if (part.from <= ch && ch < part.to) { return getRes(ch, moveInStorageOrder) }\n        ch = moveInStorageOrder ? part.from : mv(part.to, -1);\n        if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) { return getRes(ch, moveInStorageOrder) }\n      }\n    };\n\n    // Case 3a: Look for other bidi parts on the same visual line\n    var res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent);\n    if (res) { return res }\n\n    // Case 3b: Look for other bidi parts on the next visual line\n    var nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1);\n    if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {\n      res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh));\n      if (res) { return res }\n    }\n\n    // Case 4: Nowhere to move\n    return null\n  }\n\n  // Commands are parameter-less actions that can be performed on an\n  // editor, mostly used for keybindings.\n  var commands = {\n    selectAll: selectAll,\n    singleSelection: function (cm) { return cm.setSelection(cm.getCursor(\"anchor\"), cm.getCursor(\"head\"), sel_dontScroll); },\n    killLine: function (cm) { return deleteNearSelection(cm, function (range) {\n      if (range.empty()) {\n        var len = getLine(cm.doc, range.head.line).text.length;\n        if (range.head.ch == len && range.head.line < cm.lastLine())\n          { return {from: range.head, to: Pos(range.head.line + 1, 0)} }\n        else\n          { return {from: range.head, to: Pos(range.head.line, len)} }\n      } else {\n        return {from: range.from(), to: range.to()}\n      }\n    }); },\n    deleteLine: function (cm) { return deleteNearSelection(cm, function (range) { return ({\n      from: Pos(range.from().line, 0),\n      to: clipPos(cm.doc, Pos(range.to().line + 1, 0))\n    }); }); },\n    delLineLeft: function (cm) { return deleteNearSelection(cm, function (range) { return ({\n      from: Pos(range.from().line, 0), to: range.from()\n    }); }); },\n    delWrappedLineLeft: function (cm) { return deleteNearSelection(cm, function (range) {\n      var top = cm.charCoords(range.head, \"div\").top + 5;\n      var leftPos = cm.coordsChar({left: 0, top: top}, \"div\");\n      return {from: leftPos, to: range.from()}\n    }); },\n    delWrappedLineRight: function (cm) { return deleteNearSelection(cm, function (range) {\n      var top = cm.charCoords(range.head, \"div\").top + 5;\n      var rightPos = cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, \"div\");\n      return {from: range.from(), to: rightPos }\n    }); },\n    undo: function (cm) { return cm.undo(); },\n    redo: function (cm) { return cm.redo(); },\n    undoSelection: function (cm) { return cm.undoSelection(); },\n    redoSelection: function (cm) { return cm.redoSelection(); },\n    goDocStart: function (cm) { return cm.extendSelection(Pos(cm.firstLine(), 0)); },\n    goDocEnd: function (cm) { return cm.extendSelection(Pos(cm.lastLine())); },\n    goLineStart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStart(cm, range.head.line); },\n      {origin: \"+move\", bias: 1}\n    ); },\n    goLineStartSmart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStartSmart(cm, range.head); },\n      {origin: \"+move\", bias: 1}\n    ); },\n    goLineEnd: function (cm) { return cm.extendSelectionsBy(function (range) { return lineEnd(cm, range.head.line); },\n      {origin: \"+move\", bias: -1}\n    ); },\n    goLineRight: function (cm) { return cm.extendSelectionsBy(function (range) {\n      var top = cm.cursorCoords(range.head, \"div\").top + 5;\n      return cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, \"div\")\n    }, sel_move); },\n    goLineLeft: function (cm) { return cm.extendSelectionsBy(function (range) {\n      var top = cm.cursorCoords(range.head, \"div\").top + 5;\n      return cm.coordsChar({left: 0, top: top}, \"div\")\n    }, sel_move); },\n    goLineLeftSmart: function (cm) { return cm.extendSelectionsBy(function (range) {\n      var top = cm.cursorCoords(range.head, \"div\").top + 5;\n      var pos = cm.coordsChar({left: 0, top: top}, \"div\");\n      if (pos.ch < cm.getLine(pos.line).search(/\\S/)) { return lineStartSmart(cm, range.head) }\n      return pos\n    }, sel_move); },\n    goLineUp: function (cm) { return cm.moveV(-1, \"line\"); },\n    goLineDown: function (cm) { return cm.moveV(1, \"line\"); },\n    goPageUp: function (cm) { return cm.moveV(-1, \"page\"); },\n    goPageDown: function (cm) { return cm.moveV(1, \"page\"); },\n    goCharLeft: function (cm) { return cm.moveH(-1, \"char\"); },\n    goCharRight: function (cm) { return cm.moveH(1, \"char\"); },\n    goColumnLeft: function (cm) { return cm.moveH(-1, \"column\"); },\n    goColumnRight: function (cm) { return cm.moveH(1, \"column\"); },\n    goWordLeft: function (cm) { return cm.moveH(-1, \"word\"); },\n    goGroupRight: function (cm) { return cm.moveH(1, \"group\"); },\n    goGroupLeft: function (cm) { return cm.moveH(-1, \"group\"); },\n    goWordRight: function (cm) { return cm.moveH(1, \"word\"); },\n    delCharBefore: function (cm) { return cm.deleteH(-1, \"codepoint\"); },\n    delCharAfter: function (cm) { return cm.deleteH(1, \"char\"); },\n    delWordBefore: function (cm) { return cm.deleteH(-1, \"word\"); },\n    delWordAfter: function (cm) { return cm.deleteH(1, \"word\"); },\n    delGroupBefore: function (cm) { return cm.deleteH(-1, \"group\"); },\n    delGroupAfter: function (cm) { return cm.deleteH(1, \"group\"); },\n    indentAuto: function (cm) { return cm.indentSelection(\"smart\"); },\n    indentMore: function (cm) { return cm.indentSelection(\"add\"); },\n    indentLess: function (cm) { return cm.indentSelection(\"subtract\"); },\n    insertTab: function (cm) { return cm.replaceSelection(\"\\t\"); },\n    insertSoftTab: function (cm) {\n      var spaces = [], ranges = cm.listSelections(), tabSize = cm.options.tabSize;\n      for (var i = 0; i < ranges.length; i++) {\n        var pos = ranges[i].from();\n        var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);\n        spaces.push(spaceStr(tabSize - col % tabSize));\n      }\n      cm.replaceSelections(spaces);\n    },\n    defaultTab: function (cm) {\n      if (cm.somethingSelected()) { cm.indentSelection(\"add\"); }\n      else { cm.execCommand(\"insertTab\"); }\n    },\n    // Swap the two chars left and right of each selection's head.\n    // Move cursor behind the two swapped characters afterwards.\n    //\n    // Doesn't consider line feeds a character.\n    // Doesn't scan more than one line above to find a character.\n    // Doesn't do anything on an empty line.\n    // Doesn't do anything with non-empty selections.\n    transposeChars: function (cm) { return runInOp(cm, function () {\n      var ranges = cm.listSelections(), newSel = [];\n      for (var i = 0; i < ranges.length; i++) {\n        if (!ranges[i].empty()) { continue }\n        var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text;\n        if (line) {\n          if (cur.ch == line.length) { cur = new Pos(cur.line, cur.ch - 1); }\n          if (cur.ch > 0) {\n            cur = new Pos(cur.line, cur.ch + 1);\n            cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),\n                            Pos(cur.line, cur.ch - 2), cur, \"+transpose\");\n          } else if (cur.line > cm.doc.first) {\n            var prev = getLine(cm.doc, cur.line - 1).text;\n            if (prev) {\n              cur = new Pos(cur.line, 1);\n              cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +\n                              prev.charAt(prev.length - 1),\n                              Pos(cur.line - 1, prev.length - 1), cur, \"+transpose\");\n            }\n          }\n        }\n        newSel.push(new Range(cur, cur));\n      }\n      cm.setSelections(newSel);\n    }); },\n    newlineAndIndent: function (cm) { return runInOp(cm, function () {\n      var sels = cm.listSelections();\n      for (var i = sels.length - 1; i >= 0; i--)\n        { cm.replaceRange(cm.doc.lineSeparator(), sels[i].anchor, sels[i].head, \"+input\"); }\n      sels = cm.listSelections();\n      for (var i$1 = 0; i$1 < sels.length; i$1++)\n        { cm.indentLine(sels[i$1].from().line, null, true); }\n      ensureCursorVisible(cm);\n    }); },\n    openLine: function (cm) { return cm.replaceSelection(\"\\n\", \"start\"); },\n    toggleOverwrite: function (cm) { return cm.toggleOverwrite(); }\n  };\n\n\n  function lineStart(cm, lineN) {\n    var line = getLine(cm.doc, lineN);\n    var visual = visualLine(line);\n    if (visual != line) { lineN = lineNo(visual); }\n    return endOfLine(true, cm, visual, lineN, 1)\n  }\n  function lineEnd(cm, lineN) {\n    var line = getLine(cm.doc, lineN);\n    var visual = visualLineEnd(line);\n    if (visual != line) { lineN = lineNo(visual); }\n    return endOfLine(true, cm, line, lineN, -1)\n  }\n  function lineStartSmart(cm, pos) {\n    var start = lineStart(cm, pos.line);\n    var line = getLine(cm.doc, start.line);\n    var order = getOrder(line, cm.doc.direction);\n    if (!order || order[0].level == 0) {\n      var firstNonWS = Math.max(start.ch, line.text.search(/\\S/));\n      var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch;\n      return Pos(start.line, inWS ? 0 : firstNonWS, start.sticky)\n    }\n    return start\n  }\n\n  // Run a handler that was bound to a key.\n  function doHandleBinding(cm, bound, dropShift) {\n    if (typeof bound == \"string\") {\n      bound = commands[bound];\n      if (!bound) { return false }\n    }\n    // Ensure previous input has been read, so that the handler sees a\n    // consistent view of the document\n    cm.display.input.ensurePolled();\n    var prevShift = cm.display.shift, done = false;\n    try {\n      if (cm.isReadOnly()) { cm.state.suppressEdits = true; }\n      if (dropShift) { cm.display.shift = false; }\n      done = bound(cm) != Pass;\n    } finally {\n      cm.display.shift = prevShift;\n      cm.state.suppressEdits = false;\n    }\n    return done\n  }\n\n  function lookupKeyForEditor(cm, name, handle) {\n    for (var i = 0; i < cm.state.keyMaps.length; i++) {\n      var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);\n      if (result) { return result }\n    }\n    return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm))\n      || lookupKey(name, cm.options.keyMap, handle, cm)\n  }\n\n  // Note that, despite the name, this function is also used to check\n  // for bound mouse clicks.\n\n  var stopSeq = new Delayed;\n\n  function dispatchKey(cm, name, e, handle) {\n    var seq = cm.state.keySeq;\n    if (seq) {\n      if (isModifierKey(name)) { return \"handled\" }\n      if (/\\'$/.test(name))\n        { cm.state.keySeq = null; }\n      else\n        { stopSeq.set(50, function () {\n          if (cm.state.keySeq == seq) {\n            cm.state.keySeq = null;\n            cm.display.input.reset();\n          }\n        }); }\n      if (dispatchKeyInner(cm, seq + \" \" + name, e, handle)) { return true }\n    }\n    return dispatchKeyInner(cm, name, e, handle)\n  }\n\n  function dispatchKeyInner(cm, name, e, handle) {\n    var result = lookupKeyForEditor(cm, name, handle);\n\n    if (result == \"multi\")\n      { cm.state.keySeq = name; }\n    if (result == \"handled\")\n      { signalLater(cm, \"keyHandled\", cm, name, e); }\n\n    if (result == \"handled\" || result == \"multi\") {\n      e_preventDefault(e);\n      restartBlink(cm);\n    }\n\n    return !!result\n  }\n\n  // Handle a key from the keydown event.\n  function handleKeyBinding(cm, e) {\n    var name = keyName(e, true);\n    if (!name) { return false }\n\n    if (e.shiftKey && !cm.state.keySeq) {\n      // First try to resolve full name (including 'Shift-'). Failing\n      // that, see if there is a cursor-motion command (starting with\n      // 'go') bound to the keyname without 'Shift-'.\n      return dispatchKey(cm, \"Shift-\" + name, e, function (b) { return doHandleBinding(cm, b, true); })\n          || dispatchKey(cm, name, e, function (b) {\n               if (typeof b == \"string\" ? /^go[A-Z]/.test(b) : b.motion)\n                 { return doHandleBinding(cm, b) }\n             })\n    } else {\n      return dispatchKey(cm, name, e, function (b) { return doHandleBinding(cm, b); })\n    }\n  }\n\n  // Handle a key from the keypress event\n  function handleCharBinding(cm, e, ch) {\n    return dispatchKey(cm, \"'\" + ch + \"'\", e, function (b) { return doHandleBinding(cm, b, true); })\n  }\n\n  var lastStoppedKey = null;\n  function onKeyDown(e) {\n    var cm = this;\n    if (e.target && e.target != cm.display.input.getField()) { return }\n    cm.curOp.focus = activeElt();\n    if (signalDOMEvent(cm, e)) { return }\n    // IE does strange things with escape.\n    if (ie && ie_version < 11 && e.keyCode == 27) { e.returnValue = false; }\n    var code = e.keyCode;\n    cm.display.shift = code == 16 || e.shiftKey;\n    var handled = handleKeyBinding(cm, e);\n    if (presto) {\n      lastStoppedKey = handled ? code : null;\n      // Opera has no cut event... we try to at least catch the key combo\n      if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))\n        { cm.replaceSelection(\"\", null, \"cut\"); }\n    }\n    if (gecko && !mac && !handled && code == 46 && e.shiftKey && !e.ctrlKey && document.execCommand)\n      { document.execCommand(\"cut\"); }\n\n    // Turn mouse into crosshair when Alt is held on Mac.\n    if (code == 18 && !/\\bCodeMirror-crosshair\\b/.test(cm.display.lineDiv.className))\n      { showCrossHair(cm); }\n  }\n\n  function showCrossHair(cm) {\n    var lineDiv = cm.display.lineDiv;\n    addClass(lineDiv, \"CodeMirror-crosshair\");\n\n    function up(e) {\n      if (e.keyCode == 18 || !e.altKey) {\n        rmClass(lineDiv, \"CodeMirror-crosshair\");\n        off(document, \"keyup\", up);\n        off(document, \"mouseover\", up);\n      }\n    }\n    on(document, \"keyup\", up);\n    on(document, \"mouseover\", up);\n  }\n\n  function onKeyUp(e) {\n    if (e.keyCode == 16) { this.doc.sel.shift = false; }\n    signalDOMEvent(this, e);\n  }\n\n  function onKeyPress(e) {\n    var cm = this;\n    if (e.target && e.target != cm.display.input.getField()) { return }\n    if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) { return }\n    var keyCode = e.keyCode, charCode = e.charCode;\n    if (presto && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return}\n    if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) { return }\n    var ch = String.fromCharCode(charCode == null ? keyCode : charCode);\n    // Some browsers fire keypress events for backspace\n    if (ch == \"\\x08\") { return }\n    if (handleCharBinding(cm, e, ch)) { return }\n    cm.display.input.onKeyPress(e);\n  }\n\n  var DOUBLECLICK_DELAY = 400;\n\n  var PastClick = function(time, pos, button) {\n    this.time = time;\n    this.pos = pos;\n    this.button = button;\n  };\n\n  PastClick.prototype.compare = function (time, pos, button) {\n    return this.time + DOUBLECLICK_DELAY > time &&\n      cmp(pos, this.pos) == 0 && button == this.button\n  };\n\n  var lastClick, lastDoubleClick;\n  function clickRepeat(pos, button) {\n    var now = +new Date;\n    if (lastDoubleClick && lastDoubleClick.compare(now, pos, button)) {\n      lastClick = lastDoubleClick = null;\n      return \"triple\"\n    } else if (lastClick && lastClick.compare(now, pos, button)) {\n      lastDoubleClick = new PastClick(now, pos, button);\n      lastClick = null;\n      return \"double\"\n    } else {\n      lastClick = new PastClick(now, pos, button);\n      lastDoubleClick = null;\n      return \"single\"\n    }\n  }\n\n  // A mouse down can be a single click, double click, triple click,\n  // start of selection drag, start of text drag, new cursor\n  // (ctrl-click), rectangle drag (alt-drag), or xwin\n  // middle-click-paste. Or it might be a click on something we should\n  // not interfere with, such as a scrollbar or widget.\n  function onMouseDown(e) {\n    var cm = this, display = cm.display;\n    if (signalDOMEvent(cm, e) || display.activeTouch && display.input.supportsTouch()) { return }\n    display.input.ensurePolled();\n    display.shift = e.shiftKey;\n\n    if (eventInWidget(display, e)) {\n      if (!webkit) {\n        // Briefly turn off draggability, to allow widgets to do\n        // normal dragging things.\n        display.scroller.draggable = false;\n        setTimeout(function () { return display.scroller.draggable = true; }, 100);\n      }\n      return\n    }\n    if (clickInGutter(cm, e)) { return }\n    var pos = posFromMouse(cm, e), button = e_button(e), repeat = pos ? clickRepeat(pos, button) : \"single\";\n    window.focus();\n\n    // #3261: make sure, that we're not starting a second selection\n    if (button == 1 && cm.state.selectingText)\n      { cm.state.selectingText(e); }\n\n    if (pos && handleMappedButton(cm, button, pos, repeat, e)) { return }\n\n    if (button == 1) {\n      if (pos) { leftButtonDown(cm, pos, repeat, e); }\n      else if (e_target(e) == display.scroller) { e_preventDefault(e); }\n    } else if (button == 2) {\n      if (pos) { extendSelection(cm.doc, pos); }\n      setTimeout(function () { return display.input.focus(); }, 20);\n    } else if (button == 3) {\n      if (captureRightClick) { cm.display.input.onContextMenu(e); }\n      else { delayBlurEvent(cm); }\n    }\n  }\n\n  function handleMappedButton(cm, button, pos, repeat, event) {\n    var name = \"Click\";\n    if (repeat == \"double\") { name = \"Double\" + name; }\n    else if (repeat == \"triple\") { name = \"Triple\" + name; }\n    name = (button == 1 ? \"Left\" : button == 2 ? \"Middle\" : \"Right\") + name;\n\n    return dispatchKey(cm,  addModifierNames(name, event), event, function (bound) {\n      if (typeof bound == \"string\") { bound = commands[bound]; }\n      if (!bound) { return false }\n      var done = false;\n      try {\n        if (cm.isReadOnly()) { cm.state.suppressEdits = true; }\n        done = bound(cm, pos) != Pass;\n      } finally {\n        cm.state.suppressEdits = false;\n      }\n      return done\n    })\n  }\n\n  function configureMouse(cm, repeat, event) {\n    var option = cm.getOption(\"configureMouse\");\n    var value = option ? option(cm, repeat, event) : {};\n    if (value.unit == null) {\n      var rect = chromeOS ? event.shiftKey && event.metaKey : event.altKey;\n      value.unit = rect ? \"rectangle\" : repeat == \"single\" ? \"char\" : repeat == \"double\" ? \"word\" : \"line\";\n    }\n    if (value.extend == null || cm.doc.extend) { value.extend = cm.doc.extend || event.shiftKey; }\n    if (value.addNew == null) { value.addNew = mac ? event.metaKey : event.ctrlKey; }\n    if (value.moveOnDrag == null) { value.moveOnDrag = !(mac ? event.altKey : event.ctrlKey); }\n    return value\n  }\n\n  function leftButtonDown(cm, pos, repeat, event) {\n    if (ie) { setTimeout(bind(ensureFocus, cm), 0); }\n    else { cm.curOp.focus = activeElt(); }\n\n    var behavior = configureMouse(cm, repeat, event);\n\n    var sel = cm.doc.sel, contained;\n    if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&\n        repeat == \"single\" && (contained = sel.contains(pos)) > -1 &&\n        (cmp((contained = sel.ranges[contained]).from(), pos) < 0 || pos.xRel > 0) &&\n        (cmp(contained.to(), pos) > 0 || pos.xRel < 0))\n      { leftButtonStartDrag(cm, event, pos, behavior); }\n    else\n      { leftButtonSelect(cm, event, pos, behavior); }\n  }\n\n  // Start a text drag. When it ends, see if any dragging actually\n  // happen, and treat as a click if it didn't.\n  function leftButtonStartDrag(cm, event, pos, behavior) {\n    var display = cm.display, moved = false;\n    var dragEnd = operation(cm, function (e) {\n      if (webkit) { display.scroller.draggable = false; }\n      cm.state.draggingText = false;\n      if (cm.state.delayingBlurEvent) {\n        if (cm.hasFocus()) { cm.state.delayingBlurEvent = false; }\n        else { delayBlurEvent(cm); }\n      }\n      off(display.wrapper.ownerDocument, \"mouseup\", dragEnd);\n      off(display.wrapper.ownerDocument, \"mousemove\", mouseMove);\n      off(display.scroller, \"dragstart\", dragStart);\n      off(display.scroller, \"drop\", dragEnd);\n      if (!moved) {\n        e_preventDefault(e);\n        if (!behavior.addNew)\n          { extendSelection(cm.doc, pos, null, null, behavior.extend); }\n        // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)\n        if ((webkit && !safari) || ie && ie_version == 9)\n          { setTimeout(function () {display.wrapper.ownerDocument.body.focus({preventScroll: true}); display.input.focus();}, 20); }\n        else\n          { display.input.focus(); }\n      }\n    });\n    var mouseMove = function(e2) {\n      moved = moved || Math.abs(event.clientX - e2.clientX) + Math.abs(event.clientY - e2.clientY) >= 10;\n    };\n    var dragStart = function () { return moved = true; };\n    // Let the drag handler handle this.\n    if (webkit) { display.scroller.draggable = true; }\n    cm.state.draggingText = dragEnd;\n    dragEnd.copy = !behavior.moveOnDrag;\n    on(display.wrapper.ownerDocument, \"mouseup\", dragEnd);\n    on(display.wrapper.ownerDocument, \"mousemove\", mouseMove);\n    on(display.scroller, \"dragstart\", dragStart);\n    on(display.scroller, \"drop\", dragEnd);\n\n    cm.state.delayingBlurEvent = true;\n    setTimeout(function () { return display.input.focus(); }, 20);\n    // IE's approach to draggable\n    if (display.scroller.dragDrop) { display.scroller.dragDrop(); }\n  }\n\n  function rangeForUnit(cm, pos, unit) {\n    if (unit == \"char\") { return new Range(pos, pos) }\n    if (unit == \"word\") { return cm.findWordAt(pos) }\n    if (unit == \"line\") { return new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))) }\n    var result = unit(cm, pos);\n    return new Range(result.from, result.to)\n  }\n\n  // Normal selection, as opposed to text dragging.\n  function leftButtonSelect(cm, event, start, behavior) {\n    if (ie) { delayBlurEvent(cm); }\n    var display = cm.display, doc = cm.doc;\n    e_preventDefault(event);\n\n    var ourRange, ourIndex, startSel = doc.sel, ranges = startSel.ranges;\n    if (behavior.addNew && !behavior.extend) {\n      ourIndex = doc.sel.contains(start);\n      if (ourIndex > -1)\n        { ourRange = ranges[ourIndex]; }\n      else\n        { ourRange = new Range(start, start); }\n    } else {\n      ourRange = doc.sel.primary();\n      ourIndex = doc.sel.primIndex;\n    }\n\n    if (behavior.unit == \"rectangle\") {\n      if (!behavior.addNew) { ourRange = new Range(start, start); }\n      start = posFromMouse(cm, event, true, true);\n      ourIndex = -1;\n    } else {\n      var range = rangeForUnit(cm, start, behavior.unit);\n      if (behavior.extend)\n        { ourRange = extendRange(ourRange, range.anchor, range.head, behavior.extend); }\n      else\n        { ourRange = range; }\n    }\n\n    if (!behavior.addNew) {\n      ourIndex = 0;\n      setSelection(doc, new Selection([ourRange], 0), sel_mouse);\n      startSel = doc.sel;\n    } else if (ourIndex == -1) {\n      ourIndex = ranges.length;\n      setSelection(doc, normalizeSelection(cm, ranges.concat([ourRange]), ourIndex),\n                   {scroll: false, origin: \"*mouse\"});\n    } else if (ranges.length > 1 && ranges[ourIndex].empty() && behavior.unit == \"char\" && !behavior.extend) {\n      setSelection(doc, normalizeSelection(cm, ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0),\n                   {scroll: false, origin: \"*mouse\"});\n      startSel = doc.sel;\n    } else {\n      replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);\n    }\n\n    var lastPos = start;\n    function extendTo(pos) {\n      if (cmp(lastPos, pos) == 0) { return }\n      lastPos = pos;\n\n      if (behavior.unit == \"rectangle\") {\n        var ranges = [], tabSize = cm.options.tabSize;\n        var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize);\n        var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize);\n        var left = Math.min(startCol, posCol), right = Math.max(startCol, posCol);\n        for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));\n             line <= end; line++) {\n          var text = getLine(doc, line).text, leftPos = findColumn(text, left, tabSize);\n          if (left == right)\n            { ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos))); }\n          else if (text.length > leftPos)\n            { ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize)))); }\n        }\n        if (!ranges.length) { ranges.push(new Range(start, start)); }\n        setSelection(doc, normalizeSelection(cm, startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex),\n                     {origin: \"*mouse\", scroll: false});\n        cm.scrollIntoView(pos);\n      } else {\n        var oldRange = ourRange;\n        var range = rangeForUnit(cm, pos, behavior.unit);\n        var anchor = oldRange.anchor, head;\n        if (cmp(range.anchor, anchor) > 0) {\n          head = range.head;\n          anchor = minPos(oldRange.from(), range.anchor);\n        } else {\n          head = range.anchor;\n          anchor = maxPos(oldRange.to(), range.head);\n        }\n        var ranges$1 = startSel.ranges.slice(0);\n        ranges$1[ourIndex] = bidiSimplify(cm, new Range(clipPos(doc, anchor), head));\n        setSelection(doc, normalizeSelection(cm, ranges$1, ourIndex), sel_mouse);\n      }\n    }\n\n    var editorSize = display.wrapper.getBoundingClientRect();\n    // Used to ensure timeout re-tries don't fire when another extend\n    // happened in the meantime (clearTimeout isn't reliable -- at\n    // least on Chrome, the timeouts still happen even when cleared,\n    // if the clear happens after their scheduled firing time).\n    var counter = 0;\n\n    function extend(e) {\n      var curCount = ++counter;\n      var cur = posFromMouse(cm, e, true, behavior.unit == \"rectangle\");\n      if (!cur) { return }\n      if (cmp(cur, lastPos) != 0) {\n        cm.curOp.focus = activeElt();\n        extendTo(cur);\n        var visible = visibleLines(display, doc);\n        if (cur.line >= visible.to || cur.line < visible.from)\n          { setTimeout(operation(cm, function () {if (counter == curCount) { extend(e); }}), 150); }\n      } else {\n        var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;\n        if (outside) { setTimeout(operation(cm, function () {\n          if (counter != curCount) { return }\n          display.scroller.scrollTop += outside;\n          extend(e);\n        }), 50); }\n      }\n    }\n\n    function done(e) {\n      cm.state.selectingText = false;\n      counter = Infinity;\n      // If e is null or undefined we interpret this as someone trying\n      // to explicitly cancel the selection rather than the user\n      // letting go of the mouse button.\n      if (e) {\n        e_preventDefault(e);\n        display.input.focus();\n      }\n      off(display.wrapper.ownerDocument, \"mousemove\", move);\n      off(display.wrapper.ownerDocument, \"mouseup\", up);\n      doc.history.lastSelOrigin = null;\n    }\n\n    var move = operation(cm, function (e) {\n      if (e.buttons === 0 || !e_button(e)) { done(e); }\n      else { extend(e); }\n    });\n    var up = operation(cm, done);\n    cm.state.selectingText = up;\n    on(display.wrapper.ownerDocument, \"mousemove\", move);\n    on(display.wrapper.ownerDocument, \"mouseup\", up);\n  }\n\n  // Used when mouse-selecting to adjust the anchor to the proper side\n  // of a bidi jump depending on the visual position of the head.\n  function bidiSimplify(cm, range) {\n    var anchor = range.anchor;\n    var head = range.head;\n    var anchorLine = getLine(cm.doc, anchor.line);\n    if (cmp(anchor, head) == 0 && anchor.sticky == head.sticky) { return range }\n    var order = getOrder(anchorLine);\n    if (!order) { return range }\n    var index = getBidiPartAt(order, anchor.ch, anchor.sticky), part = order[index];\n    if (part.from != anchor.ch && part.to != anchor.ch) { return range }\n    var boundary = index + ((part.from == anchor.ch) == (part.level != 1) ? 0 : 1);\n    if (boundary == 0 || boundary == order.length) { return range }\n\n    // Compute the relative visual position of the head compared to the\n    // anchor (<0 is to the left, >0 to the right)\n    var leftSide;\n    if (head.line != anchor.line) {\n      leftSide = (head.line - anchor.line) * (cm.doc.direction == \"ltr\" ? 1 : -1) > 0;\n    } else {\n      var headIndex = getBidiPartAt(order, head.ch, head.sticky);\n      var dir = headIndex - index || (head.ch - anchor.ch) * (part.level == 1 ? -1 : 1);\n      if (headIndex == boundary - 1 || headIndex == boundary)\n        { leftSide = dir < 0; }\n      else\n        { leftSide = dir > 0; }\n    }\n\n    var usePart = order[boundary + (leftSide ? -1 : 0)];\n    var from = leftSide == (usePart.level == 1);\n    var ch = from ? usePart.from : usePart.to, sticky = from ? \"after\" : \"before\";\n    return anchor.ch == ch && anchor.sticky == sticky ? range : new Range(new Pos(anchor.line, ch, sticky), head)\n  }\n\n\n  // Determines whether an event happened in the gutter, and fires the\n  // handlers for the corresponding event.\n  function gutterEvent(cm, e, type, prevent) {\n    var mX, mY;\n    if (e.touches) {\n      mX = e.touches[0].clientX;\n      mY = e.touches[0].clientY;\n    } else {\n      try { mX = e.clientX; mY = e.clientY; }\n      catch(e$1) { return false }\n    }\n    if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) { return false }\n    if (prevent) { e_preventDefault(e); }\n\n    var display = cm.display;\n    var lineBox = display.lineDiv.getBoundingClientRect();\n\n    if (mY > lineBox.bottom || !hasHandler(cm, type)) { return e_defaultPrevented(e) }\n    mY -= lineBox.top - display.viewOffset;\n\n    for (var i = 0; i < cm.display.gutterSpecs.length; ++i) {\n      var g = display.gutters.childNodes[i];\n      if (g && g.getBoundingClientRect().right >= mX) {\n        var line = lineAtHeight(cm.doc, mY);\n        var gutter = cm.display.gutterSpecs[i];\n        signal(cm, type, cm, line, gutter.className, e);\n        return e_defaultPrevented(e)\n      }\n    }\n  }\n\n  function clickInGutter(cm, e) {\n    return gutterEvent(cm, e, \"gutterClick\", true)\n  }\n\n  // CONTEXT MENU HANDLING\n\n  // To make the context menu work, we need to briefly unhide the\n  // textarea (making it as unobtrusive as possible) to let the\n  // right-click take effect on it.\n  function onContextMenu(cm, e) {\n    if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) { return }\n    if (signalDOMEvent(cm, e, \"contextmenu\")) { return }\n    if (!captureRightClick) { cm.display.input.onContextMenu(e); }\n  }\n\n  function contextMenuInGutter(cm, e) {\n    if (!hasHandler(cm, \"gutterContextMenu\")) { return false }\n    return gutterEvent(cm, e, \"gutterContextMenu\", false)\n  }\n\n  function themeChanged(cm) {\n    cm.display.wrapper.className = cm.display.wrapper.className.replace(/\\s*cm-s-\\S+/g, \"\") +\n      cm.options.theme.replace(/(^|\\s)\\s*/g, \" cm-s-\");\n    clearCaches(cm);\n  }\n\n  var Init = {toString: function(){return \"CodeMirror.Init\"}};\n\n  var defaults = {};\n  var optionHandlers = {};\n\n  function defineOptions(CodeMirror) {\n    var optionHandlers = CodeMirror.optionHandlers;\n\n    function option(name, deflt, handle, notOnInit) {\n      CodeMirror.defaults[name] = deflt;\n      if (handle) { optionHandlers[name] =\n        notOnInit ? function (cm, val, old) {if (old != Init) { handle(cm, val, old); }} : handle; }\n    }\n\n    CodeMirror.defineOption = option;\n\n    // Passed to option handlers when there is no old value.\n    CodeMirror.Init = Init;\n\n    // These two are, on init, called from the constructor because they\n    // have to be initialized before the editor can start at all.\n    option(\"value\", \"\", function (cm, val) { return cm.setValue(val); }, true);\n    option(\"mode\", null, function (cm, val) {\n      cm.doc.modeOption = val;\n      loadMode(cm);\n    }, true);\n\n    option(\"indentUnit\", 2, loadMode, true);\n    option(\"indentWithTabs\", false);\n    option(\"smartIndent\", true);\n    option(\"tabSize\", 4, function (cm) {\n      resetModeState(cm);\n      clearCaches(cm);\n      regChange(cm);\n    }, true);\n\n    option(\"lineSeparator\", null, function (cm, val) {\n      cm.doc.lineSep = val;\n      if (!val) { return }\n      var newBreaks = [], lineNo = cm.doc.first;\n      cm.doc.iter(function (line) {\n        for (var pos = 0;;) {\n          var found = line.text.indexOf(val, pos);\n          if (found == -1) { break }\n          pos = found + val.length;\n          newBreaks.push(Pos(lineNo, found));\n        }\n        lineNo++;\n      });\n      for (var i = newBreaks.length - 1; i >= 0; i--)\n        { replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length)); }\n    });\n    option(\"specialChars\", /[\\u0000-\\u001f\\u007f-\\u009f\\u00ad\\u061c\\u200b\\u200e\\u200f\\u2028\\u2029\\ufeff\\ufff9-\\ufffc]/g, function (cm, val, old) {\n      cm.state.specialChars = new RegExp(val.source + (val.test(\"\\t\") ? \"\" : \"|\\t\"), \"g\");\n      if (old != Init) { cm.refresh(); }\n    });\n    option(\"specialCharPlaceholder\", defaultSpecialCharPlaceholder, function (cm) { return cm.refresh(); }, true);\n    option(\"electricChars\", true);\n    option(\"inputStyle\", mobile ? \"contenteditable\" : \"textarea\", function () {\n      throw new Error(\"inputStyle can not (yet) be changed in a running editor\") // FIXME\n    }, true);\n    option(\"spellcheck\", false, function (cm, val) { return cm.getInputField().spellcheck = val; }, true);\n    option(\"autocorrect\", false, function (cm, val) { return cm.getInputField().autocorrect = val; }, true);\n    option(\"autocapitalize\", false, function (cm, val) { return cm.getInputField().autocapitalize = val; }, true);\n    option(\"rtlMoveVisually\", !windows);\n    option(\"wholeLineUpdateBefore\", true);\n\n    option(\"theme\", \"default\", function (cm) {\n      themeChanged(cm);\n      updateGutters(cm);\n    }, true);\n    option(\"keyMap\", \"default\", function (cm, val, old) {\n      var next = getKeyMap(val);\n      var prev = old != Init && getKeyMap(old);\n      if (prev && prev.detach) { prev.detach(cm, next); }\n      if (next.attach) { next.attach(cm, prev || null); }\n    });\n    option(\"extraKeys\", null);\n    option(\"configureMouse\", null);\n\n    option(\"lineWrapping\", false, wrappingChanged, true);\n    option(\"gutters\", [], function (cm, val) {\n      cm.display.gutterSpecs = getGutters(val, cm.options.lineNumbers);\n      updateGutters(cm);\n    }, true);\n    option(\"fixedGutter\", true, function (cm, val) {\n      cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + \"px\" : \"0\";\n      cm.refresh();\n    }, true);\n    option(\"coverGutterNextToScrollbar\", false, function (cm) { return updateScrollbars(cm); }, true);\n    option(\"scrollbarStyle\", \"native\", function (cm) {\n      initScrollbars(cm);\n      updateScrollbars(cm);\n      cm.display.scrollbars.setScrollTop(cm.doc.scrollTop);\n      cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft);\n    }, true);\n    option(\"lineNumbers\", false, function (cm, val) {\n      cm.display.gutterSpecs = getGutters(cm.options.gutters, val);\n      updateGutters(cm);\n    }, true);\n    option(\"firstLineNumber\", 1, updateGutters, true);\n    option(\"lineNumberFormatter\", function (integer) { return integer; }, updateGutters, true);\n    option(\"showCursorWhenSelecting\", false, updateSelection, true);\n\n    option(\"resetSelectionOnContextMenu\", true);\n    option(\"lineWiseCopyCut\", true);\n    option(\"pasteLinesPerSelection\", true);\n    option(\"selectionsMayTouch\", false);\n\n    option(\"readOnly\", false, function (cm, val) {\n      if (val == \"nocursor\") {\n        onBlur(cm);\n        cm.display.input.blur();\n      }\n      cm.display.input.readOnlyChanged(val);\n    });\n\n    option(\"screenReaderLabel\", null, function (cm, val) {\n      val = (val === '') ? null : val;\n      cm.display.input.screenReaderLabelChanged(val);\n    });\n\n    option(\"disableInput\", false, function (cm, val) {if (!val) { cm.display.input.reset(); }}, true);\n    option(\"dragDrop\", true, dragDropChanged);\n    option(\"allowDropFileTypes\", null);\n\n    option(\"cursorBlinkRate\", 530);\n    option(\"cursorScrollMargin\", 0);\n    option(\"cursorHeight\", 1, updateSelection, true);\n    option(\"singleCursorHeightPerLine\", true, updateSelection, true);\n    option(\"workTime\", 100);\n    option(\"workDelay\", 100);\n    option(\"flattenSpans\", true, resetModeState, true);\n    option(\"addModeClass\", false, resetModeState, true);\n    option(\"pollInterval\", 100);\n    option(\"undoDepth\", 200, function (cm, val) { return cm.doc.history.undoDepth = val; });\n    option(\"historyEventDelay\", 1250);\n    option(\"viewportMargin\", 10, function (cm) { return cm.refresh(); }, true);\n    option(\"maxHighlightLength\", 10000, resetModeState, true);\n    option(\"moveInputWithCursor\", true, function (cm, val) {\n      if (!val) { cm.display.input.resetPosition(); }\n    });\n\n    option(\"tabindex\", null, function (cm, val) { return cm.display.input.getField().tabIndex = val || \"\"; });\n    option(\"autofocus\", null);\n    option(\"direction\", \"ltr\", function (cm, val) { return cm.doc.setDirection(val); }, true);\n    option(\"phrases\", null);\n  }\n\n  function dragDropChanged(cm, value, old) {\n    var wasOn = old && old != Init;\n    if (!value != !wasOn) {\n      var funcs = cm.display.dragFunctions;\n      var toggle = value ? on : off;\n      toggle(cm.display.scroller, \"dragstart\", funcs.start);\n      toggle(cm.display.scroller, \"dragenter\", funcs.enter);\n      toggle(cm.display.scroller, \"dragover\", funcs.over);\n      toggle(cm.display.scroller, \"dragleave\", funcs.leave);\n      toggle(cm.display.scroller, \"drop\", funcs.drop);\n    }\n  }\n\n  function wrappingChanged(cm) {\n    if (cm.options.lineWrapping) {\n      addClass(cm.display.wrapper, \"CodeMirror-wrap\");\n      cm.display.sizer.style.minWidth = \"\";\n      cm.display.sizerWidth = null;\n    } else {\n      rmClass(cm.display.wrapper, \"CodeMirror-wrap\");\n      findMaxLine(cm);\n    }\n    estimateLineHeights(cm);\n    regChange(cm);\n    clearCaches(cm);\n    setTimeout(function () { return updateScrollbars(cm); }, 100);\n  }\n\n  // A CodeMirror instance represents an editor. This is the object\n  // that user code is usually dealing with.\n\n  function CodeMirror(place, options) {\n    var this$1 = this;\n\n    if (!(this instanceof CodeMirror)) { return new CodeMirror(place, options) }\n\n    this.options = options = options ? copyObj(options) : {};\n    // Determine effective options based on given values and defaults.\n    copyObj(defaults, options, false);\n\n    var doc = options.value;\n    if (typeof doc == \"string\") { doc = new Doc(doc, options.mode, null, options.lineSeparator, options.direction); }\n    else if (options.mode) { doc.modeOption = options.mode; }\n    this.doc = doc;\n\n    var input = new CodeMirror.inputStyles[options.inputStyle](this);\n    var display = this.display = new Display(place, doc, input, options);\n    display.wrapper.CodeMirror = this;\n    themeChanged(this);\n    if (options.lineWrapping)\n      { this.display.wrapper.className += \" CodeMirror-wrap\"; }\n    initScrollbars(this);\n\n    this.state = {\n      keyMaps: [],  // stores maps added by addKeyMap\n      overlays: [], // highlighting overlays, as added by addOverlay\n      modeGen: 0,   // bumped when mode/overlay changes, used to invalidate highlighting info\n      overwrite: false,\n      delayingBlurEvent: false,\n      focused: false,\n      suppressEdits: false, // used to disable editing during key handlers when in readOnly mode\n      pasteIncoming: -1, cutIncoming: -1, // help recognize paste/cut edits in input.poll\n      selectingText: false,\n      draggingText: false,\n      highlight: new Delayed(), // stores highlight worker timeout\n      keySeq: null,  // Unfinished key sequence\n      specialChars: null\n    };\n\n    if (options.autofocus && !mobile) { display.input.focus(); }\n\n    // Override magic textarea content restore that IE sometimes does\n    // on our hidden textarea on reload\n    if (ie && ie_version < 11) { setTimeout(function () { return this$1.display.input.reset(true); }, 20); }\n\n    registerEventHandlers(this);\n    ensureGlobalHandlers();\n\n    startOperation(this);\n    this.curOp.forceUpdate = true;\n    attachDoc(this, doc);\n\n    if ((options.autofocus && !mobile) || this.hasFocus())\n      { setTimeout(function () {\n        if (this$1.hasFocus() && !this$1.state.focused) { onFocus(this$1); }\n      }, 20); }\n    else\n      { onBlur(this); }\n\n    for (var opt in optionHandlers) { if (optionHandlers.hasOwnProperty(opt))\n      { optionHandlers[opt](this, options[opt], Init); } }\n    maybeUpdateLineNumberWidth(this);\n    if (options.finishInit) { options.finishInit(this); }\n    for (var i = 0; i < initHooks.length; ++i) { initHooks[i](this); }\n    endOperation(this);\n    // Suppress optimizelegibility in Webkit, since it breaks text\n    // measuring on line wrapping boundaries.\n    if (webkit && options.lineWrapping &&\n        getComputedStyle(display.lineDiv).textRendering == \"optimizelegibility\")\n      { display.lineDiv.style.textRendering = \"auto\"; }\n  }\n\n  // The default configuration options.\n  CodeMirror.defaults = defaults;\n  // Functions to run when options are changed.\n  CodeMirror.optionHandlers = optionHandlers;\n\n  // Attach the necessary event handlers when initializing the editor\n  function registerEventHandlers(cm) {\n    var d = cm.display;\n    on(d.scroller, \"mousedown\", operation(cm, onMouseDown));\n    // Older IE's will not fire a second mousedown for a double click\n    if (ie && ie_version < 11)\n      { on(d.scroller, \"dblclick\", operation(cm, function (e) {\n        if (signalDOMEvent(cm, e)) { return }\n        var pos = posFromMouse(cm, e);\n        if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) { return }\n        e_preventDefault(e);\n        var word = cm.findWordAt(pos);\n        extendSelection(cm.doc, word.anchor, word.head);\n      })); }\n    else\n      { on(d.scroller, \"dblclick\", function (e) { return signalDOMEvent(cm, e) || e_preventDefault(e); }); }\n    // Some browsers fire contextmenu *after* opening the menu, at\n    // which point we can't mess with it anymore. Context menu is\n    // handled in onMouseDown for these browsers.\n    on(d.scroller, \"contextmenu\", function (e) { return onContextMenu(cm, e); });\n    on(d.input.getField(), \"contextmenu\", function (e) {\n      if (!d.scroller.contains(e.target)) { onContextMenu(cm, e); }\n    });\n\n    // Used to suppress mouse event handling when a touch happens\n    var touchFinished, prevTouch = {end: 0};\n    function finishTouch() {\n      if (d.activeTouch) {\n        touchFinished = setTimeout(function () { return d.activeTouch = null; }, 1000);\n        prevTouch = d.activeTouch;\n        prevTouch.end = +new Date;\n      }\n    }\n    function isMouseLikeTouchEvent(e) {\n      if (e.touches.length != 1) { return false }\n      var touch = e.touches[0];\n      return touch.radiusX <= 1 && touch.radiusY <= 1\n    }\n    function farAway(touch, other) {\n      if (other.left == null) { return true }\n      var dx = other.left - touch.left, dy = other.top - touch.top;\n      return dx * dx + dy * dy > 20 * 20\n    }\n    on(d.scroller, \"touchstart\", function (e) {\n      if (!signalDOMEvent(cm, e) && !isMouseLikeTouchEvent(e) && !clickInGutter(cm, e)) {\n        d.input.ensurePolled();\n        clearTimeout(touchFinished);\n        var now = +new Date;\n        d.activeTouch = {start: now, moved: false,\n                         prev: now - prevTouch.end <= 300 ? prevTouch : null};\n        if (e.touches.length == 1) {\n          d.activeTouch.left = e.touches[0].pageX;\n          d.activeTouch.top = e.touches[0].pageY;\n        }\n      }\n    });\n    on(d.scroller, \"touchmove\", function () {\n      if (d.activeTouch) { d.activeTouch.moved = true; }\n    });\n    on(d.scroller, \"touchend\", function (e) {\n      var touch = d.activeTouch;\n      if (touch && !eventInWidget(d, e) && touch.left != null &&\n          !touch.moved && new Date - touch.start < 300) {\n        var pos = cm.coordsChar(d.activeTouch, \"page\"), range;\n        if (!touch.prev || farAway(touch, touch.prev)) // Single tap\n          { range = new Range(pos, pos); }\n        else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap\n          { range = cm.findWordAt(pos); }\n        else // Triple tap\n          { range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))); }\n        cm.setSelection(range.anchor, range.head);\n        cm.focus();\n        e_preventDefault(e);\n      }\n      finishTouch();\n    });\n    on(d.scroller, \"touchcancel\", finishTouch);\n\n    // Sync scrolling between fake scrollbars and real scrollable\n    // area, ensure viewport is updated when scrolling.\n    on(d.scroller, \"scroll\", function () {\n      if (d.scroller.clientHeight) {\n        updateScrollTop(cm, d.scroller.scrollTop);\n        setScrollLeft(cm, d.scroller.scrollLeft, true);\n        signal(cm, \"scroll\", cm);\n      }\n    });\n\n    // Listen to wheel events in order to try and update the viewport on time.\n    on(d.scroller, \"mousewheel\", function (e) { return onScrollWheel(cm, e); });\n    on(d.scroller, \"DOMMouseScroll\", function (e) { return onScrollWheel(cm, e); });\n\n    // Prevent wrapper from ever scrolling\n    on(d.wrapper, \"scroll\", function () { return d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });\n\n    d.dragFunctions = {\n      enter: function (e) {if (!signalDOMEvent(cm, e)) { e_stop(e); }},\n      over: function (e) {if (!signalDOMEvent(cm, e)) { onDragOver(cm, e); e_stop(e); }},\n      start: function (e) { return onDragStart(cm, e); },\n      drop: operation(cm, onDrop),\n      leave: function (e) {if (!signalDOMEvent(cm, e)) { clearDragCursor(cm); }}\n    };\n\n    var inp = d.input.getField();\n    on(inp, \"keyup\", function (e) { return onKeyUp.call(cm, e); });\n    on(inp, \"keydown\", operation(cm, onKeyDown));\n    on(inp, \"keypress\", operation(cm, onKeyPress));\n    on(inp, \"focus\", function (e) { return onFocus(cm, e); });\n    on(inp, \"blur\", function (e) { return onBlur(cm, e); });\n  }\n\n  var initHooks = [];\n  CodeMirror.defineInitHook = function (f) { return initHooks.push(f); };\n\n  // Indent the given line. The how parameter can be \"smart\",\n  // \"add\"/null, \"subtract\", or \"prev\". When aggressive is false\n  // (typically set to true for forced single-line indents), empty\n  // lines are not indented, and places where the mode returns Pass\n  // are left alone.\n  function indentLine(cm, n, how, aggressive) {\n    var doc = cm.doc, state;\n    if (how == null) { how = \"add\"; }\n    if (how == \"smart\") {\n      // Fall back to \"prev\" when the mode doesn't have an indentation\n      // method.\n      if (!doc.mode.indent) { how = \"prev\"; }\n      else { state = getContextBefore(cm, n).state; }\n    }\n\n    var tabSize = cm.options.tabSize;\n    var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);\n    if (line.stateAfter) { line.stateAfter = null; }\n    var curSpaceString = line.text.match(/^\\s*/)[0], indentation;\n    if (!aggressive && !/\\S/.test(line.text)) {\n      indentation = 0;\n      how = \"not\";\n    } else if (how == \"smart\") {\n      indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);\n      if (indentation == Pass || indentation > 150) {\n        if (!aggressive) { return }\n        how = \"prev\";\n      }\n    }\n    if (how == \"prev\") {\n      if (n > doc.first) { indentation = countColumn(getLine(doc, n-1).text, null, tabSize); }\n      else { indentation = 0; }\n    } else if (how == \"add\") {\n      indentation = curSpace + cm.options.indentUnit;\n    } else if (how == \"subtract\") {\n      indentation = curSpace - cm.options.indentUnit;\n    } else if (typeof how == \"number\") {\n      indentation = curSpace + how;\n    }\n    indentation = Math.max(0, indentation);\n\n    var indentString = \"\", pos = 0;\n    if (cm.options.indentWithTabs)\n      { for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += \"\\t\";} }\n    if (pos < indentation) { indentString += spaceStr(indentation - pos); }\n\n    if (indentString != curSpaceString) {\n      replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), \"+input\");\n      line.stateAfter = null;\n      return true\n    } else {\n      // Ensure that, if the cursor was in the whitespace at the start\n      // of the line, it is moved to the end of that space.\n      for (var i$1 = 0; i$1 < doc.sel.ranges.length; i$1++) {\n        var range = doc.sel.ranges[i$1];\n        if (range.head.line == n && range.head.ch < curSpaceString.length) {\n          var pos$1 = Pos(n, curSpaceString.length);\n          replaceOneSelection(doc, i$1, new Range(pos$1, pos$1));\n          break\n        }\n      }\n    }\n  }\n\n  // This will be set to a {lineWise: bool, text: [string]} object, so\n  // that, when pasting, we know what kind of selections the copied\n  // text was made out of.\n  var lastCopied = null;\n\n  function setLastCopied(newLastCopied) {\n    lastCopied = newLastCopied;\n  }\n\n  function applyTextInput(cm, inserted, deleted, sel, origin) {\n    var doc = cm.doc;\n    cm.display.shift = false;\n    if (!sel) { sel = doc.sel; }\n\n    var recent = +new Date - 200;\n    var paste = origin == \"paste\" || cm.state.pasteIncoming > recent;\n    var textLines = splitLinesAuto(inserted), multiPaste = null;\n    // When pasting N lines into N selections, insert one line per selection\n    if (paste && sel.ranges.length > 1) {\n      if (lastCopied && lastCopied.text.join(\"\\n\") == inserted) {\n        if (sel.ranges.length % lastCopied.text.length == 0) {\n          multiPaste = [];\n          for (var i = 0; i < lastCopied.text.length; i++)\n            { multiPaste.push(doc.splitLines(lastCopied.text[i])); }\n        }\n      } else if (textLines.length == sel.ranges.length && cm.options.pasteLinesPerSelection) {\n        multiPaste = map(textLines, function (l) { return [l]; });\n      }\n    }\n\n    var updateInput = cm.curOp.updateInput;\n    // Normal behavior is to insert the new text into every selection\n    for (var i$1 = sel.ranges.length - 1; i$1 >= 0; i$1--) {\n      var range = sel.ranges[i$1];\n      var from = range.from(), to = range.to();\n      if (range.empty()) {\n        if (deleted && deleted > 0) // Handle deletion\n          { from = Pos(from.line, from.ch - deleted); }\n        else if (cm.state.overwrite && !paste) // Handle overwrite\n          { to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length)); }\n        else if (paste && lastCopied && lastCopied.lineWise && lastCopied.text.join(\"\\n\") == textLines.join(\"\\n\"))\n          { from = to = Pos(from.line, 0); }\n      }\n      var changeEvent = {from: from, to: to, text: multiPaste ? multiPaste[i$1 % multiPaste.length] : textLines,\n                         origin: origin || (paste ? \"paste\" : cm.state.cutIncoming > recent ? \"cut\" : \"+input\")};\n      makeChange(cm.doc, changeEvent);\n      signalLater(cm, \"inputRead\", cm, changeEvent);\n    }\n    if (inserted && !paste)\n      { triggerElectric(cm, inserted); }\n\n    ensureCursorVisible(cm);\n    if (cm.curOp.updateInput < 2) { cm.curOp.updateInput = updateInput; }\n    cm.curOp.typing = true;\n    cm.state.pasteIncoming = cm.state.cutIncoming = -1;\n  }\n\n  function handlePaste(e, cm) {\n    var pasted = e.clipboardData && e.clipboardData.getData(\"Text\");\n    if (pasted) {\n      e.preventDefault();\n      if (!cm.isReadOnly() && !cm.options.disableInput)\n        { runInOp(cm, function () { return applyTextInput(cm, pasted, 0, null, \"paste\"); }); }\n      return true\n    }\n  }\n\n  function triggerElectric(cm, inserted) {\n    // When an 'electric' character is inserted, immediately trigger a reindent\n    if (!cm.options.electricChars || !cm.options.smartIndent) { return }\n    var sel = cm.doc.sel;\n\n    for (var i = sel.ranges.length - 1; i >= 0; i--) {\n      var range = sel.ranges[i];\n      if (range.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range.head.line)) { continue }\n      var mode = cm.getModeAt(range.head);\n      var indented = false;\n      if (mode.electricChars) {\n        for (var j = 0; j < mode.electricChars.length; j++)\n          { if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {\n            indented = indentLine(cm, range.head.line, \"smart\");\n            break\n          } }\n      } else if (mode.electricInput) {\n        if (mode.electricInput.test(getLine(cm.doc, range.head.line).text.slice(0, range.head.ch)))\n          { indented = indentLine(cm, range.head.line, \"smart\"); }\n      }\n      if (indented) { signalLater(cm, \"electricInput\", cm, range.head.line); }\n    }\n  }\n\n  function copyableRanges(cm) {\n    var text = [], ranges = [];\n    for (var i = 0; i < cm.doc.sel.ranges.length; i++) {\n      var line = cm.doc.sel.ranges[i].head.line;\n      var lineRange = {anchor: Pos(line, 0), head: Pos(line + 1, 0)};\n      ranges.push(lineRange);\n      text.push(cm.getRange(lineRange.anchor, lineRange.head));\n    }\n    return {text: text, ranges: ranges}\n  }\n\n  function disableBrowserMagic(field, spellcheck, autocorrect, autocapitalize) {\n    field.setAttribute(\"autocorrect\", autocorrect ? \"\" : \"off\");\n    field.setAttribute(\"autocapitalize\", autocapitalize ? \"\" : \"off\");\n    field.setAttribute(\"spellcheck\", !!spellcheck);\n  }\n\n  function hiddenTextarea() {\n    var te = elt(\"textarea\", null, null, \"position: absolute; bottom: -1em; padding: 0; width: 1px; height: 1em; outline: none\");\n    var div = elt(\"div\", [te], null, \"overflow: hidden; position: relative; width: 3px; height: 0px;\");\n    // The textarea is kept positioned near the cursor to prevent the\n    // fact that it'll be scrolled into view on input from scrolling\n    // our fake cursor out of view. On webkit, when wrap=off, paste is\n    // very slow. So make the area wide instead.\n    if (webkit) { te.style.width = \"1000px\"; }\n    else { te.setAttribute(\"wrap\", \"off\"); }\n    // If border: 0; -- iOS fails to open keyboard (issue #1287)\n    if (ios) { te.style.border = \"1px solid black\"; }\n    disableBrowserMagic(te);\n    return div\n  }\n\n  // The publicly visible API. Note that methodOp(f) means\n  // 'wrap f in an operation, performed on its `this` parameter'.\n\n  // This is not the complete set of editor methods. Most of the\n  // methods defined on the Doc type are also injected into\n  // CodeMirror.prototype, for backwards compatibility and\n  // convenience.\n\n  function addEditorMethods(CodeMirror) {\n    var optionHandlers = CodeMirror.optionHandlers;\n\n    var helpers = CodeMirror.helpers = {};\n\n    CodeMirror.prototype = {\n      constructor: CodeMirror,\n      focus: function(){window.focus(); this.display.input.focus();},\n\n      setOption: function(option, value) {\n        var options = this.options, old = options[option];\n        if (options[option] == value && option != \"mode\") { return }\n        options[option] = value;\n        if (optionHandlers.hasOwnProperty(option))\n          { operation(this, optionHandlers[option])(this, value, old); }\n        signal(this, \"optionChange\", this, option);\n      },\n\n      getOption: function(option) {return this.options[option]},\n      getDoc: function() {return this.doc},\n\n      addKeyMap: function(map, bottom) {\n        this.state.keyMaps[bottom ? \"push\" : \"unshift\"](getKeyMap(map));\n      },\n      removeKeyMap: function(map) {\n        var maps = this.state.keyMaps;\n        for (var i = 0; i < maps.length; ++i)\n          { if (maps[i] == map || maps[i].name == map) {\n            maps.splice(i, 1);\n            return true\n          } }\n      },\n\n      addOverlay: methodOp(function(spec, options) {\n        var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);\n        if (mode.startState) { throw new Error(\"Overlays may not be stateful.\") }\n        insertSorted(this.state.overlays,\n                     {mode: mode, modeSpec: spec, opaque: options && options.opaque,\n                      priority: (options && options.priority) || 0},\n                     function (overlay) { return overlay.priority; });\n        this.state.modeGen++;\n        regChange(this);\n      }),\n      removeOverlay: methodOp(function(spec) {\n        var overlays = this.state.overlays;\n        for (var i = 0; i < overlays.length; ++i) {\n          var cur = overlays[i].modeSpec;\n          if (cur == spec || typeof spec == \"string\" && cur.name == spec) {\n            overlays.splice(i, 1);\n            this.state.modeGen++;\n            regChange(this);\n            return\n          }\n        }\n      }),\n\n      indentLine: methodOp(function(n, dir, aggressive) {\n        if (typeof dir != \"string\" && typeof dir != \"number\") {\n          if (dir == null) { dir = this.options.smartIndent ? \"smart\" : \"prev\"; }\n          else { dir = dir ? \"add\" : \"subtract\"; }\n        }\n        if (isLine(this.doc, n)) { indentLine(this, n, dir, aggressive); }\n      }),\n      indentSelection: methodOp(function(how) {\n        var ranges = this.doc.sel.ranges, end = -1;\n        for (var i = 0; i < ranges.length; i++) {\n          var range = ranges[i];\n          if (!range.empty()) {\n            var from = range.from(), to = range.to();\n            var start = Math.max(end, from.line);\n            end = Math.min(this.lastLine(), to.line - (to.ch ? 0 : 1)) + 1;\n            for (var j = start; j < end; ++j)\n              { indentLine(this, j, how); }\n            var newRanges = this.doc.sel.ranges;\n            if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0)\n              { replaceOneSelection(this.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll); }\n          } else if (range.head.line > end) {\n            indentLine(this, range.head.line, how, true);\n            end = range.head.line;\n            if (i == this.doc.sel.primIndex) { ensureCursorVisible(this); }\n          }\n        }\n      }),\n\n      // Fetch the parser token for a given character. Useful for hacks\n      // that want to inspect the mode state (say, for completion).\n      getTokenAt: function(pos, precise) {\n        return takeToken(this, pos, precise)\n      },\n\n      getLineTokens: function(line, precise) {\n        return takeToken(this, Pos(line), precise, true)\n      },\n\n      getTokenTypeAt: function(pos) {\n        pos = clipPos(this.doc, pos);\n        var styles = getLineStyles(this, getLine(this.doc, pos.line));\n        var before = 0, after = (styles.length - 1) / 2, ch = pos.ch;\n        var type;\n        if (ch == 0) { type = styles[2]; }\n        else { for (;;) {\n          var mid = (before + after) >> 1;\n          if ((mid ? styles[mid * 2 - 1] : 0) >= ch) { after = mid; }\n          else if (styles[mid * 2 + 1] < ch) { before = mid + 1; }\n          else { type = styles[mid * 2 + 2]; break }\n        } }\n        var cut = type ? type.indexOf(\"overlay \") : -1;\n        return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1)\n      },\n\n      getModeAt: function(pos) {\n        var mode = this.doc.mode;\n        if (!mode.innerMode) { return mode }\n        return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode\n      },\n\n      getHelper: function(pos, type) {\n        return this.getHelpers(pos, type)[0]\n      },\n\n      getHelpers: function(pos, type) {\n        var found = [];\n        if (!helpers.hasOwnProperty(type)) { return found }\n        var help = helpers[type], mode = this.getModeAt(pos);\n        if (typeof mode[type] == \"string\") {\n          if (help[mode[type]]) { found.push(help[mode[type]]); }\n        } else if (mode[type]) {\n          for (var i = 0; i < mode[type].length; i++) {\n            var val = help[mode[type][i]];\n            if (val) { found.push(val); }\n          }\n        } else if (mode.helperType && help[mode.helperType]) {\n          found.push(help[mode.helperType]);\n        } else if (help[mode.name]) {\n          found.push(help[mode.name]);\n        }\n        for (var i$1 = 0; i$1 < help._global.length; i$1++) {\n          var cur = help._global[i$1];\n          if (cur.pred(mode, this) && indexOf(found, cur.val) == -1)\n            { found.push(cur.val); }\n        }\n        return found\n      },\n\n      getStateAfter: function(line, precise) {\n        var doc = this.doc;\n        line = clipLine(doc, line == null ? doc.first + doc.size - 1: line);\n        return getContextBefore(this, line + 1, precise).state\n      },\n\n      cursorCoords: function(start, mode) {\n        var pos, range = this.doc.sel.primary();\n        if (start == null) { pos = range.head; }\n        else if (typeof start == \"object\") { pos = clipPos(this.doc, start); }\n        else { pos = start ? range.from() : range.to(); }\n        return cursorCoords(this, pos, mode || \"page\")\n      },\n\n      charCoords: function(pos, mode) {\n        return charCoords(this, clipPos(this.doc, pos), mode || \"page\")\n      },\n\n      coordsChar: function(coords, mode) {\n        coords = fromCoordSystem(this, coords, mode || \"page\");\n        return coordsChar(this, coords.left, coords.top)\n      },\n\n      lineAtHeight: function(height, mode) {\n        height = fromCoordSystem(this, {top: height, left: 0}, mode || \"page\").top;\n        return lineAtHeight(this.doc, height + this.display.viewOffset)\n      },\n      heightAtLine: function(line, mode, includeWidgets) {\n        var end = false, lineObj;\n        if (typeof line == \"number\") {\n          var last = this.doc.first + this.doc.size - 1;\n          if (line < this.doc.first) { line = this.doc.first; }\n          else if (line > last) { line = last; end = true; }\n          lineObj = getLine(this.doc, line);\n        } else {\n          lineObj = line;\n        }\n        return intoCoordSystem(this, lineObj, {top: 0, left: 0}, mode || \"page\", includeWidgets || end).top +\n          (end ? this.doc.height - heightAtLine(lineObj) : 0)\n      },\n\n      defaultTextHeight: function() { return textHeight(this.display) },\n      defaultCharWidth: function() { return charWidth(this.display) },\n\n      getViewport: function() { return {from: this.display.viewFrom, to: this.display.viewTo}},\n\n      addWidget: function(pos, node, scroll, vert, horiz) {\n        var display = this.display;\n        pos = cursorCoords(this, clipPos(this.doc, pos));\n        var top = pos.bottom, left = pos.left;\n        node.style.position = \"absolute\";\n        node.setAttribute(\"cm-ignore-events\", \"true\");\n        this.display.input.setUneditable(node);\n        display.sizer.appendChild(node);\n        if (vert == \"over\") {\n          top = pos.top;\n        } else if (vert == \"above\" || vert == \"near\") {\n          var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),\n          hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);\n          // Default to positioning above (if specified and possible); otherwise default to positioning below\n          if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)\n            { top = pos.top - node.offsetHeight; }\n          else if (pos.bottom + node.offsetHeight <= vspace)\n            { top = pos.bottom; }\n          if (left + node.offsetWidth > hspace)\n            { left = hspace - node.offsetWidth; }\n        }\n        node.style.top = top + \"px\";\n        node.style.left = node.style.right = \"\";\n        if (horiz == \"right\") {\n          left = display.sizer.clientWidth - node.offsetWidth;\n          node.style.right = \"0px\";\n        } else {\n          if (horiz == \"left\") { left = 0; }\n          else if (horiz == \"middle\") { left = (display.sizer.clientWidth - node.offsetWidth) / 2; }\n          node.style.left = left + \"px\";\n        }\n        if (scroll)\n          { scrollIntoView(this, {left: left, top: top, right: left + node.offsetWidth, bottom: top + node.offsetHeight}); }\n      },\n\n      triggerOnKeyDown: methodOp(onKeyDown),\n      triggerOnKeyPress: methodOp(onKeyPress),\n      triggerOnKeyUp: onKeyUp,\n      triggerOnMouseDown: methodOp(onMouseDown),\n\n      execCommand: function(cmd) {\n        if (commands.hasOwnProperty(cmd))\n          { return commands[cmd].call(null, this) }\n      },\n\n      triggerElectric: methodOp(function(text) { triggerElectric(this, text); }),\n\n      findPosH: function(from, amount, unit, visually) {\n        var dir = 1;\n        if (amount < 0) { dir = -1; amount = -amount; }\n        var cur = clipPos(this.doc, from);\n        for (var i = 0; i < amount; ++i) {\n          cur = findPosH(this.doc, cur, dir, unit, visually);\n          if (cur.hitSide) { break }\n        }\n        return cur\n      },\n\n      moveH: methodOp(function(dir, unit) {\n        var this$1 = this;\n\n        this.extendSelectionsBy(function (range) {\n          if (this$1.display.shift || this$1.doc.extend || range.empty())\n            { return findPosH(this$1.doc, range.head, dir, unit, this$1.options.rtlMoveVisually) }\n          else\n            { return dir < 0 ? range.from() : range.to() }\n        }, sel_move);\n      }),\n\n      deleteH: methodOp(function(dir, unit) {\n        var sel = this.doc.sel, doc = this.doc;\n        if (sel.somethingSelected())\n          { doc.replaceSelection(\"\", null, \"+delete\"); }\n        else\n          { deleteNearSelection(this, function (range) {\n            var other = findPosH(doc, range.head, dir, unit, false);\n            return dir < 0 ? {from: other, to: range.head} : {from: range.head, to: other}\n          }); }\n      }),\n\n      findPosV: function(from, amount, unit, goalColumn) {\n        var dir = 1, x = goalColumn;\n        if (amount < 0) { dir = -1; amount = -amount; }\n        var cur = clipPos(this.doc, from);\n        for (var i = 0; i < amount; ++i) {\n          var coords = cursorCoords(this, cur, \"div\");\n          if (x == null) { x = coords.left; }\n          else { coords.left = x; }\n          cur = findPosV(this, coords, dir, unit);\n          if (cur.hitSide) { break }\n        }\n        return cur\n      },\n\n      moveV: methodOp(function(dir, unit) {\n        var this$1 = this;\n\n        var doc = this.doc, goals = [];\n        var collapse = !this.display.shift && !doc.extend && doc.sel.somethingSelected();\n        doc.extendSelectionsBy(function (range) {\n          if (collapse)\n            { return dir < 0 ? range.from() : range.to() }\n          var headPos = cursorCoords(this$1, range.head, \"div\");\n          if (range.goalColumn != null) { headPos.left = range.goalColumn; }\n          goals.push(headPos.left);\n          var pos = findPosV(this$1, headPos, dir, unit);\n          if (unit == \"page\" && range == doc.sel.primary())\n            { addToScrollTop(this$1, charCoords(this$1, pos, \"div\").top - headPos.top); }\n          return pos\n        }, sel_move);\n        if (goals.length) { for (var i = 0; i < doc.sel.ranges.length; i++)\n          { doc.sel.ranges[i].goalColumn = goals[i]; } }\n      }),\n\n      // Find the word at the given position (as returned by coordsChar).\n      findWordAt: function(pos) {\n        var doc = this.doc, line = getLine(doc, pos.line).text;\n        var start = pos.ch, end = pos.ch;\n        if (line) {\n          var helper = this.getHelper(pos, \"wordChars\");\n          if ((pos.sticky == \"before\" || end == line.length) && start) { --start; } else { ++end; }\n          var startChar = line.charAt(start);\n          var check = isWordChar(startChar, helper)\n            ? function (ch) { return isWordChar(ch, helper); }\n            : /\\s/.test(startChar) ? function (ch) { return /\\s/.test(ch); }\n            : function (ch) { return (!/\\s/.test(ch) && !isWordChar(ch)); };\n          while (start > 0 && check(line.charAt(start - 1))) { --start; }\n          while (end < line.length && check(line.charAt(end))) { ++end; }\n        }\n        return new Range(Pos(pos.line, start), Pos(pos.line, end))\n      },\n\n      toggleOverwrite: function(value) {\n        if (value != null && value == this.state.overwrite) { return }\n        if (this.state.overwrite = !this.state.overwrite)\n          { addClass(this.display.cursorDiv, \"CodeMirror-overwrite\"); }\n        else\n          { rmClass(this.display.cursorDiv, \"CodeMirror-overwrite\"); }\n\n        signal(this, \"overwriteToggle\", this, this.state.overwrite);\n      },\n      hasFocus: function() { return this.display.input.getField() == activeElt() },\n      isReadOnly: function() { return !!(this.options.readOnly || this.doc.cantEdit) },\n\n      scrollTo: methodOp(function (x, y) { scrollToCoords(this, x, y); }),\n      getScrollInfo: function() {\n        var scroller = this.display.scroller;\n        return {left: scroller.scrollLeft, top: scroller.scrollTop,\n                height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,\n                width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,\n                clientHeight: displayHeight(this), clientWidth: displayWidth(this)}\n      },\n\n      scrollIntoView: methodOp(function(range, margin) {\n        if (range == null) {\n          range = {from: this.doc.sel.primary().head, to: null};\n          if (margin == null) { margin = this.options.cursorScrollMargin; }\n        } else if (typeof range == \"number\") {\n          range = {from: Pos(range, 0), to: null};\n        } else if (range.from == null) {\n          range = {from: range, to: null};\n        }\n        if (!range.to) { range.to = range.from; }\n        range.margin = margin || 0;\n\n        if (range.from.line != null) {\n          scrollToRange(this, range);\n        } else {\n          scrollToCoordsRange(this, range.from, range.to, range.margin);\n        }\n      }),\n\n      setSize: methodOp(function(width, height) {\n        var this$1 = this;\n\n        var interpret = function (val) { return typeof val == \"number\" || /^\\d+$/.test(String(val)) ? val + \"px\" : val; };\n        if (width != null) { this.display.wrapper.style.width = interpret(width); }\n        if (height != null) { this.display.wrapper.style.height = interpret(height); }\n        if (this.options.lineWrapping) { clearLineMeasurementCache(this); }\n        var lineNo = this.display.viewFrom;\n        this.doc.iter(lineNo, this.display.viewTo, function (line) {\n          if (line.widgets) { for (var i = 0; i < line.widgets.length; i++)\n            { if (line.widgets[i].noHScroll) { regLineChange(this$1, lineNo, \"widget\"); break } } }\n          ++lineNo;\n        });\n        this.curOp.forceUpdate = true;\n        signal(this, \"refresh\", this);\n      }),\n\n      operation: function(f){return runInOp(this, f)},\n      startOperation: function(){return startOperation(this)},\n      endOperation: function(){return endOperation(this)},\n\n      refresh: methodOp(function() {\n        var oldHeight = this.display.cachedTextHeight;\n        regChange(this);\n        this.curOp.forceUpdate = true;\n        clearCaches(this);\n        scrollToCoords(this, this.doc.scrollLeft, this.doc.scrollTop);\n        updateGutterSpace(this.display);\n        if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5 || this.options.lineWrapping)\n          { estimateLineHeights(this); }\n        signal(this, \"refresh\", this);\n      }),\n\n      swapDoc: methodOp(function(doc) {\n        var old = this.doc;\n        old.cm = null;\n        // Cancel the current text selection if any (#5821)\n        if (this.state.selectingText) { this.state.selectingText(); }\n        attachDoc(this, doc);\n        clearCaches(this);\n        this.display.input.reset();\n        scrollToCoords(this, doc.scrollLeft, doc.scrollTop);\n        this.curOp.forceScroll = true;\n        signalLater(this, \"swapDoc\", this, old);\n        return old\n      }),\n\n      phrase: function(phraseText) {\n        var phrases = this.options.phrases;\n        return phrases && Object.prototype.hasOwnProperty.call(phrases, phraseText) ? phrases[phraseText] : phraseText\n      },\n\n      getInputField: function(){return this.display.input.getField()},\n      getWrapperElement: function(){return this.display.wrapper},\n      getScrollerElement: function(){return this.display.scroller},\n      getGutterElement: function(){return this.display.gutters}\n    };\n    eventMixin(CodeMirror);\n\n    CodeMirror.registerHelper = function(type, name, value) {\n      if (!helpers.hasOwnProperty(type)) { helpers[type] = CodeMirror[type] = {_global: []}; }\n      helpers[type][name] = value;\n    };\n    CodeMirror.registerGlobalHelper = function(type, name, predicate, value) {\n      CodeMirror.registerHelper(type, name, value);\n      helpers[type]._global.push({pred: predicate, val: value});\n    };\n  }\n\n  // Used for horizontal relative motion. Dir is -1 or 1 (left or\n  // right), unit can be \"codepoint\", \"char\", \"column\" (like char, but\n  // doesn't cross line boundaries), \"word\" (across next word), or\n  // \"group\" (to the start of next group of word or\n  // non-word-non-whitespace chars). The visually param controls\n  // whether, in right-to-left text, direction 1 means to move towards\n  // the next index in the string, or towards the character to the right\n  // of the current position. The resulting position will have a\n  // hitSide=true property if it reached the end of the document.\n  function findPosH(doc, pos, dir, unit, visually) {\n    var oldPos = pos;\n    var origDir = dir;\n    var lineObj = getLine(doc, pos.line);\n    var lineDir = visually && doc.direction == \"rtl\" ? -dir : dir;\n    function findNextLine() {\n      var l = pos.line + lineDir;\n      if (l < doc.first || l >= doc.first + doc.size) { return false }\n      pos = new Pos(l, pos.ch, pos.sticky);\n      return lineObj = getLine(doc, l)\n    }\n    function moveOnce(boundToLine) {\n      var next;\n      if (unit == \"codepoint\") {\n        var ch = lineObj.text.charCodeAt(pos.ch + (dir > 0 ? 0 : -1));\n        if (isNaN(ch)) {\n          next = null;\n        } else {\n          var astral = dir > 0 ? ch >= 0xD800 && ch < 0xDC00 : ch >= 0xDC00 && ch < 0xDFFF;\n          next = new Pos(pos.line, Math.max(0, Math.min(lineObj.text.length, pos.ch + dir * (astral ? 2 : 1))), -dir);\n        }\n      } else if (visually) {\n        next = moveVisually(doc.cm, lineObj, pos, dir);\n      } else {\n        next = moveLogically(lineObj, pos, dir);\n      }\n      if (next == null) {\n        if (!boundToLine && findNextLine())\n          { pos = endOfLine(visually, doc.cm, lineObj, pos.line, lineDir); }\n        else\n          { return false }\n      } else {\n        pos = next;\n      }\n      return true\n    }\n\n    if (unit == \"char\" || unit == \"codepoint\") {\n      moveOnce();\n    } else if (unit == \"column\") {\n      moveOnce(true);\n    } else if (unit == \"word\" || unit == \"group\") {\n      var sawType = null, group = unit == \"group\";\n      var helper = doc.cm && doc.cm.getHelper(pos, \"wordChars\");\n      for (var first = true;; first = false) {\n        if (dir < 0 && !moveOnce(!first)) { break }\n        var cur = lineObj.text.charAt(pos.ch) || \"\\n\";\n        var type = isWordChar(cur, helper) ? \"w\"\n          : group && cur == \"\\n\" ? \"n\"\n          : !group || /\\s/.test(cur) ? null\n          : \"p\";\n        if (group && !first && !type) { type = \"s\"; }\n        if (sawType && sawType != type) {\n          if (dir < 0) {dir = 1; moveOnce(); pos.sticky = \"after\";}\n          break\n        }\n\n        if (type) { sawType = type; }\n        if (dir > 0 && !moveOnce(!first)) { break }\n      }\n    }\n    var result = skipAtomic(doc, pos, oldPos, origDir, true);\n    if (equalCursorPos(oldPos, result)) { result.hitSide = true; }\n    return result\n  }\n\n  // For relative vertical movement. Dir may be -1 or 1. Unit can be\n  // \"page\" or \"line\". The resulting position will have a hitSide=true\n  // property if it reached the end of the document.\n  function findPosV(cm, pos, dir, unit) {\n    var doc = cm.doc, x = pos.left, y;\n    if (unit == \"page\") {\n      var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);\n      var moveAmount = Math.max(pageSize - .5 * textHeight(cm.display), 3);\n      y = (dir > 0 ? pos.bottom : pos.top) + dir * moveAmount;\n\n    } else if (unit == \"line\") {\n      y = dir > 0 ? pos.bottom + 3 : pos.top - 3;\n    }\n    var target;\n    for (;;) {\n      target = coordsChar(cm, x, y);\n      if (!target.outside) { break }\n      if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break }\n      y += dir * 5;\n    }\n    return target\n  }\n\n  // CONTENTEDITABLE INPUT STYLE\n\n  var ContentEditableInput = function(cm) {\n    this.cm = cm;\n    this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null;\n    this.polling = new Delayed();\n    this.composing = null;\n    this.gracePeriod = false;\n    this.readDOMTimeout = null;\n  };\n\n  ContentEditableInput.prototype.init = function (display) {\n      var this$1 = this;\n\n    var input = this, cm = input.cm;\n    var div = input.div = display.lineDiv;\n    div.contentEditable = true;\n    disableBrowserMagic(div, cm.options.spellcheck, cm.options.autocorrect, cm.options.autocapitalize);\n\n    function belongsToInput(e) {\n      for (var t = e.target; t; t = t.parentNode) {\n        if (t == div) { return true }\n        if (/\\bCodeMirror-(?:line)?widget\\b/.test(t.className)) { break }\n      }\n      return false\n    }\n\n    on(div, \"paste\", function (e) {\n      if (!belongsToInput(e) || signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }\n      // IE doesn't fire input events, so we schedule a read for the pasted content in this way\n      if (ie_version <= 11) { setTimeout(operation(cm, function () { return this$1.updateFromDOM(); }), 20); }\n    });\n\n    on(div, \"compositionstart\", function (e) {\n      this$1.composing = {data: e.data, done: false};\n    });\n    on(div, \"compositionupdate\", function (e) {\n      if (!this$1.composing) { this$1.composing = {data: e.data, done: false}; }\n    });\n    on(div, \"compositionend\", function (e) {\n      if (this$1.composing) {\n        if (e.data != this$1.composing.data) { this$1.readFromDOMSoon(); }\n        this$1.composing.done = true;\n      }\n    });\n\n    on(div, \"touchstart\", function () { return input.forceCompositionEnd(); });\n\n    on(div, \"input\", function () {\n      if (!this$1.composing) { this$1.readFromDOMSoon(); }\n    });\n\n    function onCopyCut(e) {\n      if (!belongsToInput(e) || signalDOMEvent(cm, e)) { return }\n      if (cm.somethingSelected()) {\n        setLastCopied({lineWise: false, text: cm.getSelections()});\n        if (e.type == \"cut\") { cm.replaceSelection(\"\", null, \"cut\"); }\n      } else if (!cm.options.lineWiseCopyCut) {\n        return\n      } else {\n        var ranges = copyableRanges(cm);\n        setLastCopied({lineWise: true, text: ranges.text});\n        if (e.type == \"cut\") {\n          cm.operation(function () {\n            cm.setSelections(ranges.ranges, 0, sel_dontScroll);\n            cm.replaceSelection(\"\", null, \"cut\");\n          });\n        }\n      }\n      if (e.clipboardData) {\n        e.clipboardData.clearData();\n        var content = lastCopied.text.join(\"\\n\");\n        // iOS exposes the clipboard API, but seems to discard content inserted into it\n        e.clipboardData.setData(\"Text\", content);\n        if (e.clipboardData.getData(\"Text\") == content) {\n          e.preventDefault();\n          return\n        }\n      }\n      // Old-fashioned briefly-focus-a-textarea hack\n      var kludge = hiddenTextarea(), te = kludge.firstChild;\n      cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild);\n      te.value = lastCopied.text.join(\"\\n\");\n      var hadFocus = activeElt();\n      selectInput(te);\n      setTimeout(function () {\n        cm.display.lineSpace.removeChild(kludge);\n        hadFocus.focus();\n        if (hadFocus == div) { input.showPrimarySelection(); }\n      }, 50);\n    }\n    on(div, \"copy\", onCopyCut);\n    on(div, \"cut\", onCopyCut);\n  };\n\n  ContentEditableInput.prototype.screenReaderLabelChanged = function (label) {\n    // Label for screenreaders, accessibility\n    if(label) {\n      this.div.setAttribute('aria-label', label);\n    } else {\n      this.div.removeAttribute('aria-label');\n    }\n  };\n\n  ContentEditableInput.prototype.prepareSelection = function () {\n    var result = prepareSelection(this.cm, false);\n    result.focus = activeElt() == this.div;\n    return result\n  };\n\n  ContentEditableInput.prototype.showSelection = function (info, takeFocus) {\n    if (!info || !this.cm.display.view.length) { return }\n    if (info.focus || takeFocus) { this.showPrimarySelection(); }\n    this.showMultipleSelections(info);\n  };\n\n  ContentEditableInput.prototype.getSelection = function () {\n    return this.cm.display.wrapper.ownerDocument.getSelection()\n  };\n\n  ContentEditableInput.prototype.showPrimarySelection = function () {\n    var sel = this.getSelection(), cm = this.cm, prim = cm.doc.sel.primary();\n    var from = prim.from(), to = prim.to();\n\n    if (cm.display.viewTo == cm.display.viewFrom || from.line >= cm.display.viewTo || to.line < cm.display.viewFrom) {\n      sel.removeAllRanges();\n      return\n    }\n\n    var curAnchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);\n    var curFocus = domToPos(cm, sel.focusNode, sel.focusOffset);\n    if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&\n        cmp(minPos(curAnchor, curFocus), from) == 0 &&\n        cmp(maxPos(curAnchor, curFocus), to) == 0)\n      { return }\n\n    var view = cm.display.view;\n    var start = (from.line >= cm.display.viewFrom && posToDOM(cm, from)) ||\n        {node: view[0].measure.map[2], offset: 0};\n    var end = to.line < cm.display.viewTo && posToDOM(cm, to);\n    if (!end) {\n      var measure = view[view.length - 1].measure;\n      var map = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map;\n      end = {node: map[map.length - 1], offset: map[map.length - 2] - map[map.length - 3]};\n    }\n\n    if (!start || !end) {\n      sel.removeAllRanges();\n      return\n    }\n\n    var old = sel.rangeCount && sel.getRangeAt(0), rng;\n    try { rng = range(start.node, start.offset, end.offset, end.node); }\n    catch(e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible\n    if (rng) {\n      if (!gecko && cm.state.focused) {\n        sel.collapse(start.node, start.offset);\n        if (!rng.collapsed) {\n          sel.removeAllRanges();\n          sel.addRange(rng);\n        }\n      } else {\n        sel.removeAllRanges();\n        sel.addRange(rng);\n      }\n      if (old && sel.anchorNode == null) { sel.addRange(old); }\n      else if (gecko) { this.startGracePeriod(); }\n    }\n    this.rememberSelection();\n  };\n\n  ContentEditableInput.prototype.startGracePeriod = function () {\n      var this$1 = this;\n\n    clearTimeout(this.gracePeriod);\n    this.gracePeriod = setTimeout(function () {\n      this$1.gracePeriod = false;\n      if (this$1.selectionChanged())\n        { this$1.cm.operation(function () { return this$1.cm.curOp.selectionChanged = true; }); }\n    }, 20);\n  };\n\n  ContentEditableInput.prototype.showMultipleSelections = function (info) {\n    removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors);\n    removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection);\n  };\n\n  ContentEditableInput.prototype.rememberSelection = function () {\n    var sel = this.getSelection();\n    this.lastAnchorNode = sel.anchorNode; this.lastAnchorOffset = sel.anchorOffset;\n    this.lastFocusNode = sel.focusNode; this.lastFocusOffset = sel.focusOffset;\n  };\n\n  ContentEditableInput.prototype.selectionInEditor = function () {\n    var sel = this.getSelection();\n    if (!sel.rangeCount) { return false }\n    var node = sel.getRangeAt(0).commonAncestorContainer;\n    return contains(this.div, node)\n  };\n\n  ContentEditableInput.prototype.focus = function () {\n    if (this.cm.options.readOnly != \"nocursor\") {\n      if (!this.selectionInEditor() || activeElt() != this.div)\n        { this.showSelection(this.prepareSelection(), true); }\n      this.div.focus();\n    }\n  };\n  ContentEditableInput.prototype.blur = function () { this.div.blur(); };\n  ContentEditableInput.prototype.getField = function () { return this.div };\n\n  ContentEditableInput.prototype.supportsTouch = function () { return true };\n\n  ContentEditableInput.prototype.receivedFocus = function () {\n    var input = this;\n    if (this.selectionInEditor())\n      { this.pollSelection(); }\n    else\n      { runInOp(this.cm, function () { return input.cm.curOp.selectionChanged = true; }); }\n\n    function poll() {\n      if (input.cm.state.focused) {\n        input.pollSelection();\n        input.polling.set(input.cm.options.pollInterval, poll);\n      }\n    }\n    this.polling.set(this.cm.options.pollInterval, poll);\n  };\n\n  ContentEditableInput.prototype.selectionChanged = function () {\n    var sel = this.getSelection();\n    return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||\n      sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset\n  };\n\n  ContentEditableInput.prototype.pollSelection = function () {\n    if (this.readDOMTimeout != null || this.gracePeriod || !this.selectionChanged()) { return }\n    var sel = this.getSelection(), cm = this.cm;\n    // On Android Chrome (version 56, at least), backspacing into an\n    // uneditable block element will put the cursor in that element,\n    // and then, because it's not editable, hide the virtual keyboard.\n    // Because Android doesn't allow us to actually detect backspace\n    // presses in a sane way, this code checks for when that happens\n    // and simulates a backspace press in this case.\n    if (android && chrome && this.cm.display.gutterSpecs.length && isInGutter(sel.anchorNode)) {\n      this.cm.triggerOnKeyDown({type: \"keydown\", keyCode: 8, preventDefault: Math.abs});\n      this.blur();\n      this.focus();\n      return\n    }\n    if (this.composing) { return }\n    this.rememberSelection();\n    var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);\n    var head = domToPos(cm, sel.focusNode, sel.focusOffset);\n    if (anchor && head) { runInOp(cm, function () {\n      setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll);\n      if (anchor.bad || head.bad) { cm.curOp.selectionChanged = true; }\n    }); }\n  };\n\n  ContentEditableInput.prototype.pollContent = function () {\n    if (this.readDOMTimeout != null) {\n      clearTimeout(this.readDOMTimeout);\n      this.readDOMTimeout = null;\n    }\n\n    var cm = this.cm, display = cm.display, sel = cm.doc.sel.primary();\n    var from = sel.from(), to = sel.to();\n    if (from.ch == 0 && from.line > cm.firstLine())\n      { from = Pos(from.line - 1, getLine(cm.doc, from.line - 1).length); }\n    if (to.ch == getLine(cm.doc, to.line).text.length && to.line < cm.lastLine())\n      { to = Pos(to.line + 1, 0); }\n    if (from.line < display.viewFrom || to.line > display.viewTo - 1) { return false }\n\n    var fromIndex, fromLine, fromNode;\n    if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {\n      fromLine = lineNo(display.view[0].line);\n      fromNode = display.view[0].node;\n    } else {\n      fromLine = lineNo(display.view[fromIndex].line);\n      fromNode = display.view[fromIndex - 1].node.nextSibling;\n    }\n    var toIndex = findViewIndex(cm, to.line);\n    var toLine, toNode;\n    if (toIndex == display.view.length - 1) {\n      toLine = display.viewTo - 1;\n      toNode = display.lineDiv.lastChild;\n    } else {\n      toLine = lineNo(display.view[toIndex + 1].line) - 1;\n      toNode = display.view[toIndex + 1].node.previousSibling;\n    }\n\n    if (!fromNode) { return false }\n    var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine));\n    var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length));\n    while (newText.length > 1 && oldText.length > 1) {\n      if (lst(newText) == lst(oldText)) { newText.pop(); oldText.pop(); toLine--; }\n      else if (newText[0] == oldText[0]) { newText.shift(); oldText.shift(); fromLine++; }\n      else { break }\n    }\n\n    var cutFront = 0, cutEnd = 0;\n    var newTop = newText[0], oldTop = oldText[0], maxCutFront = Math.min(newTop.length, oldTop.length);\n    while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront))\n      { ++cutFront; }\n    var newBot = lst(newText), oldBot = lst(oldText);\n    var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),\n                             oldBot.length - (oldText.length == 1 ? cutFront : 0));\n    while (cutEnd < maxCutEnd &&\n           newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1))\n      { ++cutEnd; }\n    // Try to move start of change to start of selection if ambiguous\n    if (newText.length == 1 && oldText.length == 1 && fromLine == from.line) {\n      while (cutFront && cutFront > from.ch &&\n             newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {\n        cutFront--;\n        cutEnd++;\n      }\n    }\n\n    newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd).replace(/^\\u200b+/, \"\");\n    newText[0] = newText[0].slice(cutFront).replace(/\\u200b+$/, \"\");\n\n    var chFrom = Pos(fromLine, cutFront);\n    var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0);\n    if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {\n      replaceRange(cm.doc, newText, chFrom, chTo, \"+input\");\n      return true\n    }\n  };\n\n  ContentEditableInput.prototype.ensurePolled = function () {\n    this.forceCompositionEnd();\n  };\n  ContentEditableInput.prototype.reset = function () {\n    this.forceCompositionEnd();\n  };\n  ContentEditableInput.prototype.forceCompositionEnd = function () {\n    if (!this.composing) { return }\n    clearTimeout(this.readDOMTimeout);\n    this.composing = null;\n    this.updateFromDOM();\n    this.div.blur();\n    this.div.focus();\n  };\n  ContentEditableInput.prototype.readFromDOMSoon = function () {\n      var this$1 = this;\n\n    if (this.readDOMTimeout != null) { return }\n    this.readDOMTimeout = setTimeout(function () {\n      this$1.readDOMTimeout = null;\n      if (this$1.composing) {\n        if (this$1.composing.done) { this$1.composing = null; }\n        else { return }\n      }\n      this$1.updateFromDOM();\n    }, 80);\n  };\n\n  ContentEditableInput.prototype.updateFromDOM = function () {\n      var this$1 = this;\n\n    if (this.cm.isReadOnly() || !this.pollContent())\n      { runInOp(this.cm, function () { return regChange(this$1.cm); }); }\n  };\n\n  ContentEditableInput.prototype.setUneditable = function (node) {\n    node.contentEditable = \"false\";\n  };\n\n  ContentEditableInput.prototype.onKeyPress = function (e) {\n    if (e.charCode == 0 || this.composing) { return }\n    e.preventDefault();\n    if (!this.cm.isReadOnly())\n      { operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0); }\n  };\n\n  ContentEditableInput.prototype.readOnlyChanged = function (val) {\n    this.div.contentEditable = String(val != \"nocursor\");\n  };\n\n  ContentEditableInput.prototype.onContextMenu = function () {};\n  ContentEditableInput.prototype.resetPosition = function () {};\n\n  ContentEditableInput.prototype.needsContentAttribute = true;\n\n  function posToDOM(cm, pos) {\n    var view = findViewForLine(cm, pos.line);\n    if (!view || view.hidden) { return null }\n    var line = getLine(cm.doc, pos.line);\n    var info = mapFromLineView(view, line, pos.line);\n\n    var order = getOrder(line, cm.doc.direction), side = \"left\";\n    if (order) {\n      var partPos = getBidiPartAt(order, pos.ch);\n      side = partPos % 2 ? \"right\" : \"left\";\n    }\n    var result = nodeAndOffsetInLineMap(info.map, pos.ch, side);\n    result.offset = result.collapse == \"right\" ? result.end : result.start;\n    return result\n  }\n\n  function isInGutter(node) {\n    for (var scan = node; scan; scan = scan.parentNode)\n      { if (/CodeMirror-gutter-wrapper/.test(scan.className)) { return true } }\n    return false\n  }\n\n  function badPos(pos, bad) { if (bad) { pos.bad = true; } return pos }\n\n  function domTextBetween(cm, from, to, fromLine, toLine) {\n    var text = \"\", closing = false, lineSep = cm.doc.lineSeparator(), extraLinebreak = false;\n    function recognizeMarker(id) { return function (marker) { return marker.id == id; } }\n    function close() {\n      if (closing) {\n        text += lineSep;\n        if (extraLinebreak) { text += lineSep; }\n        closing = extraLinebreak = false;\n      }\n    }\n    function addText(str) {\n      if (str) {\n        close();\n        text += str;\n      }\n    }\n    function walk(node) {\n      if (node.nodeType == 1) {\n        var cmText = node.getAttribute(\"cm-text\");\n        if (cmText) {\n          addText(cmText);\n          return\n        }\n        var markerID = node.getAttribute(\"cm-marker\"), range;\n        if (markerID) {\n          var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID));\n          if (found.length && (range = found[0].find(0)))\n            { addText(getBetween(cm.doc, range.from, range.to).join(lineSep)); }\n          return\n        }\n        if (node.getAttribute(\"contenteditable\") == \"false\") { return }\n        var isBlock = /^(pre|div|p|li|table|br)$/i.test(node.nodeName);\n        if (!/^br$/i.test(node.nodeName) && node.textContent.length == 0) { return }\n\n        if (isBlock) { close(); }\n        for (var i = 0; i < node.childNodes.length; i++)\n          { walk(node.childNodes[i]); }\n\n        if (/^(pre|p)$/i.test(node.nodeName)) { extraLinebreak = true; }\n        if (isBlock) { closing = true; }\n      } else if (node.nodeType == 3) {\n        addText(node.nodeValue.replace(/\\u200b/g, \"\").replace(/\\u00a0/g, \" \"));\n      }\n    }\n    for (;;) {\n      walk(from);\n      if (from == to) { break }\n      from = from.nextSibling;\n      extraLinebreak = false;\n    }\n    return text\n  }\n\n  function domToPos(cm, node, offset) {\n    var lineNode;\n    if (node == cm.display.lineDiv) {\n      lineNode = cm.display.lineDiv.childNodes[offset];\n      if (!lineNode) { return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true) }\n      node = null; offset = 0;\n    } else {\n      for (lineNode = node;; lineNode = lineNode.parentNode) {\n        if (!lineNode || lineNode == cm.display.lineDiv) { return null }\n        if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) { break }\n      }\n    }\n    for (var i = 0; i < cm.display.view.length; i++) {\n      var lineView = cm.display.view[i];\n      if (lineView.node == lineNode)\n        { return locateNodeInLineView(lineView, node, offset) }\n    }\n  }\n\n  function locateNodeInLineView(lineView, node, offset) {\n    var wrapper = lineView.text.firstChild, bad = false;\n    if (!node || !contains(wrapper, node)) { return badPos(Pos(lineNo(lineView.line), 0), true) }\n    if (node == wrapper) {\n      bad = true;\n      node = wrapper.childNodes[offset];\n      offset = 0;\n      if (!node) {\n        var line = lineView.rest ? lst(lineView.rest) : lineView.line;\n        return badPos(Pos(lineNo(line), line.text.length), bad)\n      }\n    }\n\n    var textNode = node.nodeType == 3 ? node : null, topNode = node;\n    if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {\n      textNode = node.firstChild;\n      if (offset) { offset = textNode.nodeValue.length; }\n    }\n    while (topNode.parentNode != wrapper) { topNode = topNode.parentNode; }\n    var measure = lineView.measure, maps = measure.maps;\n\n    function find(textNode, topNode, offset) {\n      for (var i = -1; i < (maps ? maps.length : 0); i++) {\n        var map = i < 0 ? measure.map : maps[i];\n        for (var j = 0; j < map.length; j += 3) {\n          var curNode = map[j + 2];\n          if (curNode == textNode || curNode == topNode) {\n            var line = lineNo(i < 0 ? lineView.line : lineView.rest[i]);\n            var ch = map[j] + offset;\n            if (offset < 0 || curNode != textNode) { ch = map[j + (offset ? 1 : 0)]; }\n            return Pos(line, ch)\n          }\n        }\n      }\n    }\n    var found = find(textNode, topNode, offset);\n    if (found) { return badPos(found, bad) }\n\n    // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems\n    for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {\n      found = find(after, after.firstChild, 0);\n      if (found)\n        { return badPos(Pos(found.line, found.ch - dist), bad) }\n      else\n        { dist += after.textContent.length; }\n    }\n    for (var before = topNode.previousSibling, dist$1 = offset; before; before = before.previousSibling) {\n      found = find(before, before.firstChild, -1);\n      if (found)\n        { return badPos(Pos(found.line, found.ch + dist$1), bad) }\n      else\n        { dist$1 += before.textContent.length; }\n    }\n  }\n\n  // TEXTAREA INPUT STYLE\n\n  var TextareaInput = function(cm) {\n    this.cm = cm;\n    // See input.poll and input.reset\n    this.prevInput = \"\";\n\n    // Flag that indicates whether we expect input to appear real soon\n    // now (after some event like 'keypress' or 'input') and are\n    // polling intensively.\n    this.pollingFast = false;\n    // Self-resetting timeout for the poller\n    this.polling = new Delayed();\n    // Used to work around IE issue with selection being forgotten when focus moves away from textarea\n    this.hasSelection = false;\n    this.composing = null;\n  };\n\n  TextareaInput.prototype.init = function (display) {\n      var this$1 = this;\n\n    var input = this, cm = this.cm;\n    this.createField(display);\n    var te = this.textarea;\n\n    display.wrapper.insertBefore(this.wrapper, display.wrapper.firstChild);\n\n    // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)\n    if (ios) { te.style.width = \"0px\"; }\n\n    on(te, \"input\", function () {\n      if (ie && ie_version >= 9 && this$1.hasSelection) { this$1.hasSelection = null; }\n      input.poll();\n    });\n\n    on(te, \"paste\", function (e) {\n      if (signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }\n\n      cm.state.pasteIncoming = +new Date;\n      input.fastPoll();\n    });\n\n    function prepareCopyCut(e) {\n      if (signalDOMEvent(cm, e)) { return }\n      if (cm.somethingSelected()) {\n        setLastCopied({lineWise: false, text: cm.getSelections()});\n      } else if (!cm.options.lineWiseCopyCut) {\n        return\n      } else {\n        var ranges = copyableRanges(cm);\n        setLastCopied({lineWise: true, text: ranges.text});\n        if (e.type == \"cut\") {\n          cm.setSelections(ranges.ranges, null, sel_dontScroll);\n        } else {\n          input.prevInput = \"\";\n          te.value = ranges.text.join(\"\\n\");\n          selectInput(te);\n        }\n      }\n      if (e.type == \"cut\") { cm.state.cutIncoming = +new Date; }\n    }\n    on(te, \"cut\", prepareCopyCut);\n    on(te, \"copy\", prepareCopyCut);\n\n    on(display.scroller, \"paste\", function (e) {\n      if (eventInWidget(display, e) || signalDOMEvent(cm, e)) { return }\n      if (!te.dispatchEvent) {\n        cm.state.pasteIncoming = +new Date;\n        input.focus();\n        return\n      }\n\n      // Pass the `paste` event to the textarea so it's handled by its event listener.\n      var event = new Event(\"paste\");\n      event.clipboardData = e.clipboardData;\n      te.dispatchEvent(event);\n    });\n\n    // Prevent normal selection in the editor (we handle our own)\n    on(display.lineSpace, \"selectstart\", function (e) {\n      if (!eventInWidget(display, e)) { e_preventDefault(e); }\n    });\n\n    on(te, \"compositionstart\", function () {\n      var start = cm.getCursor(\"from\");\n      if (input.composing) { input.composing.range.clear(); }\n      input.composing = {\n        start: start,\n        range: cm.markText(start, cm.getCursor(\"to\"), {className: \"CodeMirror-composing\"})\n      };\n    });\n    on(te, \"compositionend\", function () {\n      if (input.composing) {\n        input.poll();\n        input.composing.range.clear();\n        input.composing = null;\n      }\n    });\n  };\n\n  TextareaInput.prototype.createField = function (_display) {\n    // Wraps and hides input textarea\n    this.wrapper = hiddenTextarea();\n    // The semihidden textarea that is focused when the editor is\n    // focused, and receives input.\n    this.textarea = this.wrapper.firstChild;\n  };\n\n  TextareaInput.prototype.screenReaderLabelChanged = function (label) {\n    // Label for screenreaders, accessibility\n    if(label) {\n      this.textarea.setAttribute('aria-label', label);\n    } else {\n      this.textarea.removeAttribute('aria-label');\n    }\n  };\n\n  TextareaInput.prototype.prepareSelection = function () {\n    // Redraw the selection and/or cursor\n    var cm = this.cm, display = cm.display, doc = cm.doc;\n    var result = prepareSelection(cm);\n\n    // Move the hidden textarea near the cursor to prevent scrolling artifacts\n    if (cm.options.moveInputWithCursor) {\n      var headPos = cursorCoords(cm, doc.sel.primary().head, \"div\");\n      var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect();\n      result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,\n                                          headPos.top + lineOff.top - wrapOff.top));\n      result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,\n                                           headPos.left + lineOff.left - wrapOff.left));\n    }\n\n    return result\n  };\n\n  TextareaInput.prototype.showSelection = function (drawn) {\n    var cm = this.cm, display = cm.display;\n    removeChildrenAndAdd(display.cursorDiv, drawn.cursors);\n    removeChildrenAndAdd(display.selectionDiv, drawn.selection);\n    if (drawn.teTop != null) {\n      this.wrapper.style.top = drawn.teTop + \"px\";\n      this.wrapper.style.left = drawn.teLeft + \"px\";\n    }\n  };\n\n  // Reset the input to correspond to the selection (or to be empty,\n  // when not typing and nothing is selected)\n  TextareaInput.prototype.reset = function (typing) {\n    if (this.contextMenuPending || this.composing) { return }\n    var cm = this.cm;\n    if (cm.somethingSelected()) {\n      this.prevInput = \"\";\n      var content = cm.getSelection();\n      this.textarea.value = content;\n      if (cm.state.focused) { selectInput(this.textarea); }\n      if (ie && ie_version >= 9) { this.hasSelection = content; }\n    } else if (!typing) {\n      this.prevInput = this.textarea.value = \"\";\n      if (ie && ie_version >= 9) { this.hasSelection = null; }\n    }\n  };\n\n  TextareaInput.prototype.getField = function () { return this.textarea };\n\n  TextareaInput.prototype.supportsTouch = function () { return false };\n\n  TextareaInput.prototype.focus = function () {\n    if (this.cm.options.readOnly != \"nocursor\" && (!mobile || activeElt() != this.textarea)) {\n      try { this.textarea.focus(); }\n      catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM\n    }\n  };\n\n  TextareaInput.prototype.blur = function () { this.textarea.blur(); };\n\n  TextareaInput.prototype.resetPosition = function () {\n    this.wrapper.style.top = this.wrapper.style.left = 0;\n  };\n\n  TextareaInput.prototype.receivedFocus = function () { this.slowPoll(); };\n\n  // Poll for input changes, using the normal rate of polling. This\n  // runs as long as the editor is focused.\n  TextareaInput.prototype.slowPoll = function () {\n      var this$1 = this;\n\n    if (this.pollingFast) { return }\n    this.polling.set(this.cm.options.pollInterval, function () {\n      this$1.poll();\n      if (this$1.cm.state.focused) { this$1.slowPoll(); }\n    });\n  };\n\n  // When an event has just come in that is likely to add or change\n  // something in the input textarea, we poll faster, to ensure that\n  // the change appears on the screen quickly.\n  TextareaInput.prototype.fastPoll = function () {\n    var missed = false, input = this;\n    input.pollingFast = true;\n    function p() {\n      var changed = input.poll();\n      if (!changed && !missed) {missed = true; input.polling.set(60, p);}\n      else {input.pollingFast = false; input.slowPoll();}\n    }\n    input.polling.set(20, p);\n  };\n\n  // Read input from the textarea, and update the document to match.\n  // When something is selected, it is present in the textarea, and\n  // selected (unless it is huge, in which case a placeholder is\n  // used). When nothing is selected, the cursor sits after previously\n  // seen text (can be empty), which is stored in prevInput (we must\n  // not reset the textarea when typing, because that breaks IME).\n  TextareaInput.prototype.poll = function () {\n      var this$1 = this;\n\n    var cm = this.cm, input = this.textarea, prevInput = this.prevInput;\n    // Since this is called a *lot*, try to bail out as cheaply as\n    // possible when it is clear that nothing happened. hasSelection\n    // will be the case when there is a lot of text in the textarea,\n    // in which case reading its value would be expensive.\n    if (this.contextMenuPending || !cm.state.focused ||\n        (hasSelection(input) && !prevInput && !this.composing) ||\n        cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq)\n      { return false }\n\n    var text = input.value;\n    // If nothing changed, bail.\n    if (text == prevInput && !cm.somethingSelected()) { return false }\n    // Work around nonsensical selection resetting in IE9/10, and\n    // inexplicable appearance of private area unicode characters on\n    // some key combos in Mac (#2689).\n    if (ie && ie_version >= 9 && this.hasSelection === text ||\n        mac && /[\\uf700-\\uf7ff]/.test(text)) {\n      cm.display.input.reset();\n      return false\n    }\n\n    if (cm.doc.sel == cm.display.selForContextMenu) {\n      var first = text.charCodeAt(0);\n      if (first == 0x200b && !prevInput) { prevInput = \"\\u200b\"; }\n      if (first == 0x21da) { this.reset(); return this.cm.execCommand(\"undo\") }\n    }\n    // Find the part of the input that is actually new\n    var same = 0, l = Math.min(prevInput.length, text.length);\n    while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) { ++same; }\n\n    runInOp(cm, function () {\n      applyTextInput(cm, text.slice(same), prevInput.length - same,\n                     null, this$1.composing ? \"*compose\" : null);\n\n      // Don't leave long text in the textarea, since it makes further polling slow\n      if (text.length > 1000 || text.indexOf(\"\\n\") > -1) { input.value = this$1.prevInput = \"\"; }\n      else { this$1.prevInput = text; }\n\n      if (this$1.composing) {\n        this$1.composing.range.clear();\n        this$1.composing.range = cm.markText(this$1.composing.start, cm.getCursor(\"to\"),\n                                           {className: \"CodeMirror-composing\"});\n      }\n    });\n    return true\n  };\n\n  TextareaInput.prototype.ensurePolled = function () {\n    if (this.pollingFast && this.poll()) { this.pollingFast = false; }\n  };\n\n  TextareaInput.prototype.onKeyPress = function () {\n    if (ie && ie_version >= 9) { this.hasSelection = null; }\n    this.fastPoll();\n  };\n\n  TextareaInput.prototype.onContextMenu = function (e) {\n    var input = this, cm = input.cm, display = cm.display, te = input.textarea;\n    if (input.contextMenuPending) { input.contextMenuPending(); }\n    var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;\n    if (!pos || presto) { return } // Opera is difficult.\n\n    // Reset the current text selection only if the click is done outside of the selection\n    // and 'resetSelectionOnContextMenu' option is true.\n    var reset = cm.options.resetSelectionOnContextMenu;\n    if (reset && cm.doc.sel.contains(pos) == -1)\n      { operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll); }\n\n    var oldCSS = te.style.cssText, oldWrapperCSS = input.wrapper.style.cssText;\n    var wrapperBox = input.wrapper.offsetParent.getBoundingClientRect();\n    input.wrapper.style.cssText = \"position: static\";\n    te.style.cssText = \"position: absolute; width: 30px; height: 30px;\\n      top: \" + (e.clientY - wrapperBox.top - 5) + \"px; left: \" + (e.clientX - wrapperBox.left - 5) + \"px;\\n      z-index: 1000; background: \" + (ie ? \"rgba(255, 255, 255, .05)\" : \"transparent\") + \";\\n      outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);\";\n    var oldScrollY;\n    if (webkit) { oldScrollY = window.scrollY; } // Work around Chrome issue (#2712)\n    display.input.focus();\n    if (webkit) { window.scrollTo(null, oldScrollY); }\n    display.input.reset();\n    // Adds \"Select all\" to context menu in FF\n    if (!cm.somethingSelected()) { te.value = input.prevInput = \" \"; }\n    input.contextMenuPending = rehide;\n    display.selForContextMenu = cm.doc.sel;\n    clearTimeout(display.detectingSelectAll);\n\n    // Select-all will be greyed out if there's nothing to select, so\n    // this adds a zero-width space so that we can later check whether\n    // it got selected.\n    function prepareSelectAllHack() {\n      if (te.selectionStart != null) {\n        var selected = cm.somethingSelected();\n        var extval = \"\\u200b\" + (selected ? te.value : \"\");\n        te.value = \"\\u21da\"; // Used to catch context-menu undo\n        te.value = extval;\n        input.prevInput = selected ? \"\" : \"\\u200b\";\n        te.selectionStart = 1; te.selectionEnd = extval.length;\n        // Re-set this, in case some other handler touched the\n        // selection in the meantime.\n        display.selForContextMenu = cm.doc.sel;\n      }\n    }\n    function rehide() {\n      if (input.contextMenuPending != rehide) { return }\n      input.contextMenuPending = false;\n      input.wrapper.style.cssText = oldWrapperCSS;\n      te.style.cssText = oldCSS;\n      if (ie && ie_version < 9) { display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos); }\n\n      // Try to detect the user choosing select-all\n      if (te.selectionStart != null) {\n        if (!ie || (ie && ie_version < 9)) { prepareSelectAllHack(); }\n        var i = 0, poll = function () {\n          if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&\n              te.selectionEnd > 0 && input.prevInput == \"\\u200b\") {\n            operation(cm, selectAll)(cm);\n          } else if (i++ < 10) {\n            display.detectingSelectAll = setTimeout(poll, 500);\n          } else {\n            display.selForContextMenu = null;\n            display.input.reset();\n          }\n        };\n        display.detectingSelectAll = setTimeout(poll, 200);\n      }\n    }\n\n    if (ie && ie_version >= 9) { prepareSelectAllHack(); }\n    if (captureRightClick) {\n      e_stop(e);\n      var mouseup = function () {\n        off(window, \"mouseup\", mouseup);\n        setTimeout(rehide, 20);\n      };\n      on(window, \"mouseup\", mouseup);\n    } else {\n      setTimeout(rehide, 50);\n    }\n  };\n\n  TextareaInput.prototype.readOnlyChanged = function (val) {\n    if (!val) { this.reset(); }\n    this.textarea.disabled = val == \"nocursor\";\n    this.textarea.readOnly = !!val;\n  };\n\n  TextareaInput.prototype.setUneditable = function () {};\n\n  TextareaInput.prototype.needsContentAttribute = false;\n\n  function fromTextArea(textarea, options) {\n    options = options ? copyObj(options) : {};\n    options.value = textarea.value;\n    if (!options.tabindex && textarea.tabIndex)\n      { options.tabindex = textarea.tabIndex; }\n    if (!options.placeholder && textarea.placeholder)\n      { options.placeholder = textarea.placeholder; }\n    // Set autofocus to true if this textarea is focused, or if it has\n    // autofocus and no other element is focused.\n    if (options.autofocus == null) {\n      var hasFocus = activeElt();\n      options.autofocus = hasFocus == textarea ||\n        textarea.getAttribute(\"autofocus\") != null && hasFocus == document.body;\n    }\n\n    function save() {textarea.value = cm.getValue();}\n\n    var realSubmit;\n    if (textarea.form) {\n      on(textarea.form, \"submit\", save);\n      // Deplorable hack to make the submit method do the right thing.\n      if (!options.leaveSubmitMethodAlone) {\n        var form = textarea.form;\n        realSubmit = form.submit;\n        try {\n          var wrappedSubmit = form.submit = function () {\n            save();\n            form.submit = realSubmit;\n            form.submit();\n            form.submit = wrappedSubmit;\n          };\n        } catch(e) {}\n      }\n    }\n\n    options.finishInit = function (cm) {\n      cm.save = save;\n      cm.getTextArea = function () { return textarea; };\n      cm.toTextArea = function () {\n        cm.toTextArea = isNaN; // Prevent this from being ran twice\n        save();\n        textarea.parentNode.removeChild(cm.getWrapperElement());\n        textarea.style.display = \"\";\n        if (textarea.form) {\n          off(textarea.form, \"submit\", save);\n          if (!options.leaveSubmitMethodAlone && typeof textarea.form.submit == \"function\")\n            { textarea.form.submit = realSubmit; }\n        }\n      };\n    };\n\n    textarea.style.display = \"none\";\n    var cm = CodeMirror(function (node) { return textarea.parentNode.insertBefore(node, textarea.nextSibling); },\n      options);\n    return cm\n  }\n\n  function addLegacyProps(CodeMirror) {\n    CodeMirror.off = off;\n    CodeMirror.on = on;\n    CodeMirror.wheelEventPixels = wheelEventPixels;\n    CodeMirror.Doc = Doc;\n    CodeMirror.splitLines = splitLinesAuto;\n    CodeMirror.countColumn = countColumn;\n    CodeMirror.findColumn = findColumn;\n    CodeMirror.isWordChar = isWordCharBasic;\n    CodeMirror.Pass = Pass;\n    CodeMirror.signal = signal;\n    CodeMirror.Line = Line;\n    CodeMirror.changeEnd = changeEnd;\n    CodeMirror.scrollbarModel = scrollbarModel;\n    CodeMirror.Pos = Pos;\n    CodeMirror.cmpPos = cmp;\n    CodeMirror.modes = modes;\n    CodeMirror.mimeModes = mimeModes;\n    CodeMirror.resolveMode = resolveMode;\n    CodeMirror.getMode = getMode;\n    CodeMirror.modeExtensions = modeExtensions;\n    CodeMirror.extendMode = extendMode;\n    CodeMirror.copyState = copyState;\n    CodeMirror.startState = startState;\n    CodeMirror.innerMode = innerMode;\n    CodeMirror.commands = commands;\n    CodeMirror.keyMap = keyMap;\n    CodeMirror.keyName = keyName;\n    CodeMirror.isModifierKey = isModifierKey;\n    CodeMirror.lookupKey = lookupKey;\n    CodeMirror.normalizeKeyMap = normalizeKeyMap;\n    CodeMirror.StringStream = StringStream;\n    CodeMirror.SharedTextMarker = SharedTextMarker;\n    CodeMirror.TextMarker = TextMarker;\n    CodeMirror.LineWidget = LineWidget;\n    CodeMirror.e_preventDefault = e_preventDefault;\n    CodeMirror.e_stopPropagation = e_stopPropagation;\n    CodeMirror.e_stop = e_stop;\n    CodeMirror.addClass = addClass;\n    CodeMirror.contains = contains;\n    CodeMirror.rmClass = rmClass;\n    CodeMirror.keyNames = keyNames;\n  }\n\n  // EDITOR CONSTRUCTOR\n\n  defineOptions(CodeMirror);\n\n  addEditorMethods(CodeMirror);\n\n  // Set up methods on CodeMirror's prototype to redirect to the editor's document.\n  var dontDelegate = \"iter insert remove copy getEditor constructor\".split(\" \");\n  for (var prop in Doc.prototype) { if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)\n    { CodeMirror.prototype[prop] = (function(method) {\n      return function() {return method.apply(this.doc, arguments)}\n    })(Doc.prototype[prop]); } }\n\n  eventMixin(Doc);\n  CodeMirror.inputStyles = {\"textarea\": TextareaInput, \"contenteditable\": ContentEditableInput};\n\n  // Extra arguments are stored as the mode's dependencies, which is\n  // used by (legacy) mechanisms like loadmode.js to automatically\n  // load a mode. (Preferred mechanism is the require/define calls.)\n  CodeMirror.defineMode = function(name/*, mode, …*/) {\n    if (!CodeMirror.defaults.mode && name != \"null\") { CodeMirror.defaults.mode = name; }\n    defineMode.apply(this, arguments);\n  };\n\n  CodeMirror.defineMIME = defineMIME;\n\n  // Minimal default mode.\n  CodeMirror.defineMode(\"null\", function () { return ({token: function (stream) { return stream.skipToEnd(); }}); });\n  CodeMirror.defineMIME(\"text/plain\", \"null\");\n\n  // EXTENSIONS\n\n  CodeMirror.defineExtension = function (name, func) {\n    CodeMirror.prototype[name] = func;\n  };\n  CodeMirror.defineDocExtension = function (name, func) {\n    Doc.prototype[name] = func;\n  };\n\n  CodeMirror.fromTextArea = fromTextArea;\n\n  addLegacyProps(CodeMirror);\n\n  CodeMirror.version = \"5.61.1\";\n\n  return CodeMirror;\n\n})));\n\n\n//# sourceURL=webpack://_JUPYTERLAB.CORE_OUTPUT/../node_modules/codemirror/lib/codemirror.js?");

/***/ })

}]);