/**
 * term.js - an xterm emulator
 * Copyright (c) 2012-2013, Christopher Jeffrey (MIT License)
 * https://github.com/chjj/term.js
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * Originally forked from (with the author's permission):
 *     Fabrice Bellard's javascript vt100 for jslinux:
 *     http://bellard.org/jslinux/
 *     Copyright (c) 2011 Fabrice Bellard
 *     The original design remains. The terminal itself
 *     has been extended to include xterm CSI codes, among
 *     other features.
 */

var SCROLL_SIZE = 3;

define(["underscore", "backbone"], function(_, Backbone) {
    /**
     * Terminal Emulation References:
     *     http://vt100.net/
     *     http://invisible-island.net/xterm/ctlseqs/ctlseqs.txt
     *     http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
     *     http://invisible-island.net/vttest/
     *     http://www.inwap.com/pdp10/ansicode.txt
     *     http://linux.die.net/man/4/console_codes
     *     http://linux.die.net/man/7/urxvt
     */

    'use strict';

    /**
     * States
     */

    var normal = 0
        , escaped = 1
        , csi = 2
        , osc = 3
        , charset = 4
        , dcs = 5
        , ignore = 6;

    /**
     * Terminal
     */
    var Terminal = Backbone.View.extend({
        className: "terminal",
        initialize : function(options) {
            var self = this;
            options = options || {};

            each(keys(this.defaults), function(key) {
                if (options[key] == null) {
                    options[key] = self.options[key];
                    // Legacy:
                    if (self[key] !== self.defaults[key]) {
                        options[key] = self[key];
                    }
                }
                self[key] = options[key];
            });

            if (options.colors.length === 8) {
                options.colors = options.colors.concat(this._colors.slice(8));
            } else if (options.colors.length === 16) {
                options.colors = options.colors.concat(this._colors.slice(16));
            } else if (options.colors.length === 10) {
                options.colors = options.colors.slice(0, -2).concat(
                    this._colors.slice(8, -2), options.colors.slice(-2));
            } else if (options.colors.length === 18) {
                options.colors = options.colors.concat(
                    this._colors.slice(16, -2), options.colors.slice(-2));
            }
            this.colors = options.colors;

            this.options = options;

            // this.context = options.context || window;
            // this.document = options.document || document;
            this.parent = options.body || options.parent
                || (document ? document.getElementsByTagName('body')[0] : null);

            this.cols = options.cols;
            this.rows = options.rows;

            if (options.handler) {
                this.on('data', options.handler);
            }

            this.ybase = 0;
            this.ydisp = 0;
            this.x = 0;
            this.y = 0;
            this.cursorState = 0;
            this.cursorHidden = false;
            this.convertEol;
            this.state = 0;
            this.queue = '';
            this.scrollTop = 0;
            this.scrollBottom = this.rows - 1;

            // modes
            this.applicationKeypad = false;
            this.applicationCursor = false;
            this.originMode = false;
            this.insertMode = false;
            this.wraparoundMode = false;
            this.normal = null;

            // select modes
            this.prefixMode = false;
            this.selectMode = false;
            this.visualMode = false;
            this.searchMode = false;
            this.searchDown;
            this.entry = '';
            this.entryPrefix = '';
            this._real;
            this._selected;
            this._textarea;

            // charset
            this.charset = null;
            this.gcharset = null;
            this.glevel = 0;
            this.charsets = [null];

            // mouse properties
            this.decLocator;
            this.x10Mouse;
            this.vt200Mouse;
            this.vt300Mouse;
            this.normalMouse;
            this.mouseEvents;
            this.sendFocus;
            this.utfMouse;
            this.sgrMouse;
            this.urxvtMouse;

            // misc
            this.children;
            this.refreshStart;
            this.refreshEnd;
            this.savedX;
            this.savedY;
            this.savedCols;

            // stream
            this.readable = true;
            this.writable = true;

            this.defAttr = (0 << 18) | (257 << 9) | (256 << 0);
            this.curAttr = this.defAttr;

            this.params = [];
            this.currentParam = 0;
            this.prefix = '';
            this.postfix = '';

            this.lines = [];
            var i = this.rows;
            while (i--) {
                this.lines.push(this.blankLine());
            }

            this.tabs;
            this.setupStops();
        },

        // back_color_erase feature for xterm.
        eraseAttr : function() {
            // if (this.is('screen')) return this.defAttr;
            return (this.defAttr & ~0x1ff) | (this.curAttr & 0x1ff);
        },

        /**
         * Colors
         */

        // Colors 0-15
        tangoColors : [
            // dark:
            '#2e3436',
            '#cc0000',
            '#4e9a06',
            '#c4a000',
            '#3465a4',
            '#75507b',
            '#06989a',
            '#d3d7cf',
            // bright:
            '#555753',
            '#ef2929',
            '#8ae234',
            '#fce94f',
            '#729fcf',
            '#ad7fa8',
            '#34e2e2',
            '#eeeeec'
        ],

        xtermColors : [
            // dark:
            '#000000', // black
            '#cd0000', // red3
            '#00cd00', // green3
            '#cdcd00', // yellow3
            '#0000ee', // blue2
            '#cd00cd', // magenta3
            '#00cdcd', // cyan3
            '#e5e5e5', // gray90
            // bright:
            '#7f7f7f', // gray50
            '#ff0000', // red
            '#00ff00', // green
            '#ffff00', // yellow
            '#5c5cff', // rgb:5c/5c/ff
            '#ff00ff', // magenta
            '#00ffff', // cyan
            '#ffffff'    // white
        ],

        /**
         * Options
         */

        defaults : {
            convertEol: false,
            termName: 'xterm',
            cursorBlink: true,
            visualBell: false,
            popOnBell: false,
            scrollback: 1000,
            screenKeys: false,
            debug: false,
            useStyle: false
            // programFeatures: false,
            // focusKeys: false,
        },

        options : {},


        /**
         * Focused Terminal
         */

        focus : function() {
            if (Terminal.prototype.focusedTerminal === this) return;

            if (Terminal.prototype.focusedTerminal) {
                Terminal.prototype.focusedTerminal.blur();
            }

            if (this.sendFocus) this.send('\x1b[I');
            this.showCursor();

            // try {
            //     this.el.focus();
            // } catch (e) {
            //     ;
            // }

            // this.trigger('focus');

            Terminal.prototype.focusedTerminal = this;
        },

        blur : function() {
            if (Terminal.prototype.focusedTerminal !== this) return;

            this.cursorState = 0;
            this.refresh(this.y, this.y);
            if (this.sendFocus) this.send('\x1b[O');

            Terminal.prototype.focusedTerminal = null;
        },

        /**
         * Initialize global behavior
         */

        initGlobal : function() {
            var document = this.document;

            Terminal.prototype._boundDocs = Terminal.prototype._boundDocs || [];
            if (~indexOf(Terminal.prototype._boundDocs, document)) {
                return;
            }
            Terminal.prototype._boundDocs.push(document);

            if (this.useStyle) {
                this.insertStyle(document, this.colors[256], this.colors[257]);
            }
        },

        onPaste : function(ev) {
            if (ev.originalEvent.clipboardData) {
                this.send(ev.originalEvent.clipboardData.getData('text/plain'));
            } else if (this.context.clipboardData) {
                this.send(this.context.clipboardData.getData('Text'));
            }

            return cancel(ev);
        },

        onCopy : function(ev) {
            if (!this._selected) return;
            var textarea = this.getCopyTextarea();
            var text = this.grabText(
                this._selected.x1, this._selected.x2,
                this._selected.y1, this._selected.y2);
            this.trigger('copy', text);
            textarea.focus();
            textarea.textContent = text;
            textarea.value = text;
            textarea.setSelectionRange(0, text.length);
            setTimeout(_.bind(function() {
                this.el.focus();
                this.focus();
            }, this), 1);
        },

        /**
         * Insert a default style
         */

        insertStyle : function(document, bg, fg) {
            var style = document.getElementById('term-style');
            if (style) return;

            var head = document.getElementsByTagName('head')[0];
            if (!head) return;

            var style = document.createElement('style');
            style.id = 'term-style';

            // textContent doesn't work well with IE for <style> elements.
            style.innerHTML = ''
                + '.terminal {\n'
                + '    float: left;\n'
                + '    border: ' + bg + ' solid 5px;\n'
                + '    font-family: "DejaVu Sans Mono", "Liberation Mono", monospace;\n'
                + '    font-size: 11px;\n'
                + '    color: ' + fg + ';\n'
                + '    background: ' + bg + ';\n'
                + '}\n'
                + '\n'
                + '.terminal-cursor {\n'
                + '    color: ' + bg + ';\n'
                + '    background: ' + fg + ';\n'
                + '}\n';

            head.insertBefore(style, head.firstChild);
        },

        /**
         * Open Terminal
         */

        open : function(parent) {
            var self = this
                , i = 0
                , div;

            this.parent = parent || this.parent;

            if (!this.parent) {
                throw new Error('Terminal requires a parent element.');
            }

            // Grab global elements.
            this.context = this.parent.ownerDocument.defaultView;
            this.document = this.parent.ownerDocument;
            this.body = this.document.getElementsByTagName('body')[0];

            // Parse user-agent strings.
            if (this.context.navigator && this.context.navigator.userAgent) {
                this.isMac = !!~this.context.navigator.userAgent.indexOf('Mac');
                this.isIpad = !!~this.context.navigator.userAgent.indexOf('iPad');
                this.isMSIE = !!~this.context.navigator.userAgent.indexOf('MSIE');
            }

            // Create our main terminal element.
            this.el.style.outline = 'none';
            this.el.setAttribute('tabindex', 0);
            this.el.style.backgroundColor = this.colors[256];
            this.el.style.color = this.colors[257];

            // Create the lines for our terminal.
            this.children = [];
            for (; i < this.rows; i++) {
                div = this.document.createElement('div');
                this.el.appendChild(div);
                this.children.push(div);
            }
            this.parent.appendChild(this.el);

            // Draw the screen.
            this.refresh(0, this.rows - 1);

            // Initialize global actions that
            // need to be taken on the document.
            this.initGlobal();

            // Ensure there is a Terminal.focus.
            this.focus();

            // Start blinking the cursor.
            this.startBlink();

            // Bind to DOM events related
            // to focus and paste behavior.
            on(this.el, 'focus', function() {
                self.focus();
                if (self.isIpad) {
                    Terminal.prototype._textarea.focus();
                }
            });

            // This causes slightly funky behavior.
            // on(this.el, 'blur', function() {
            //     self.blur();
            // });

            // TODO: make sure this isn't screwing things
            on(this.el, 'mousedown', function() {
                self.focus();
            });

            // Clickable paste workaround, using contentEditable.
            // This probably shouldn't work,
            // ... but it does. Firefox's paste
            // event seems to only work for textareas?
//            on(this.el, 'mousedown', function(ev) {
//                var button = ev.button != null
//                    ? +ev.button
//                    : ev.which != null
//                        ? ev.which - 1
//                        : null;
//
//                // Does IE9 do this?
//                if (self.isMSIE) {
//                    button = button === 1 ? 0 : button === 4 ? 1 : button;
//                }
//
//                if (button !== 2) return;
//
//                self.el.contentEditable = 'true';
//                setTimeout(function() {
//                    self.el.contentEditable = 'inherit'; // 'false';
//                }, 1);
//            }, true);

            // Listen for mouse events and translate
            // them into terminal mouse protocols.
            this.bindMouse();

            // Figure out whether boldness affects
            // the character width of monospace fonts.
            if (Terminal.prototype.brokenBold == null) {
                Terminal.prototype.brokenBold = isBoldBroken(this.document);
            }

            setTimeout(function() {
                self.el.focus();
            }, 100);
        },

        // XTerm mouse events
        // http://invisible-island.net/xterm/ctlseqs/ctlseqs.html#Mouse%20Tracking
        // To better understand these
        // the xterm code is very helpful:
        // Relevant files:
        //     button.c, charproc.c, misc.c
        // Relevant functions in xterm/button.c:
        //     BtnCode, EmitButtonCode, EditorButton, SendMousePosition
        bindMouse : function() {
            var el = this.el
                , self = this
                , pressed = 32;

            var wheelEvent = 'onmousewheel' in this.context
                ? 'mousewheel'
                : 'DOMMouseScroll';

            // mouseup, mousedown, mousewheel
            // left click: ^[[M 3<^[[M#3<
            // mousewheel up: ^[[M`3>
            function sendButton(ev) {
                debugger;
                var button
                    , pos;

                // get the xterm-style button
                button = getButton(ev);

                // get mouse coordinates
                pos = getCoords(ev);
                if (!pos) return;

                sendEvent(button, pos);

                switch (ev.type) {
                    case 'mousedown':
                        pressed = button;
                        break;
                    case 'mouseup':
                        // keep it at the left
                        // button, just in case.
                        pressed = 32;
                        break;
                    case wheelEvent:
                        // nothing. don't
                        // interfere with
                        // `pressed`.
                        break;
                }
            }

            // motion example of a left click:
            // ^[[M 3<^[[M@4<^[[M@5<^[[M@6<^[[M@7<^[[M#7<
            function sendMove(ev) {
                var button = pressed
                    , pos;

                pos = getCoords(ev);
                if (!pos) return;

                // buttons marked as motions
                // are incremented by 32
                button += 32;

                sendEvent(button, pos);
            }

            // encode button and
            // position to characters
            function encode(data, ch) {
                if (!self.utfMouse) {
                    if (ch === 255) return data.push(0);
                    if (ch > 127) ch = 127;
                    data.push(ch);
                } else {
                    if (ch === 2047) return data.push(0);
                    if (ch < 127) {
                        data.push(ch);
                    } else {
                        if (ch > 2047) ch = 2047;
                        data.push(0xC0 | (ch >> 6));
                        data.push(0x80 | (ch & 0x3F));
                    }
                }
            }

            // send a mouse event:
            // regular/utf8: ^[[M Cb Cx Cy
            // urxvt: ^[[ Cb ; Cx ; Cy M
            // sgr: ^[[ Cb ; Cx ; Cy M/m
            // vt300: ^[[ 24(1/3/5)~ [ Cx , Cy ] \r
            // locator: CSI P e ; P b ; P r ; P c ; P p & w
            function sendEvent(button, pos) {
                // self.trigger('mouse', {
                //     x: pos.x - 32,
                //     y: pos.x - 32,
                //     button: button
                // });

                if (self.vt300Mouse) {
                    // NOTE: Unstable.
                    // http://www.vt100.net/docs/vt3xx-gp/chapter15.html
                    button &= 3;
                    pos.x -= 32;
                    pos.y -= 32;
                    var data = '\x1b[24';
                    if (button === 0) data += '1';
                    else if (button === 1) data += '3';
                    else if (button === 2) data += '5';
                    else if (button === 3) return;
                    else data += '0';
                    data += '~[' + pos.x + ',' + pos.y + ']\r';
                    self.send(data);
                    return;
                }

                if (self.decLocator) {
                    // NOTE: Unstable.
                    button &= 3;
                    pos.x -= 32;
                    pos.y -= 32;
                    if (button === 0) button = 2;
                    else if (button === 1) button = 4;
                    else if (button === 2) button = 6;
                    else if (button === 3) button = 3;
                    self.send('\x1b['
                        + button
                        + ';'
                        + (button === 3 ? 4 : 0)
                        + ';'
                        + pos.y
                        + ';'
                        + pos.x
                        + ';'
                        + (pos.page || 0)
                        + '&w');
                    return;
                }

                if (self.urxvtMouse) {
                    pos.x -= 32;
                    pos.y -= 32;
                    pos.x++;
                    pos.y++;
                    self.send('\x1b[' + button + ';' + pos.x + ';' + pos.y + 'M');
                    return;
                }

                if (self.sgrMouse) {
                    pos.x -= 32;
                    pos.y -= 32;
                    self.send('\x1b[<'
                        + ((button & 3) === 3 ? button & ~3 : button)
                        + ';'
                        + pos.x
                        + ';'
                        + pos.y
                        + ((button & 3) === 3 ? 'm' : 'M'));
                    return;
                }

                var data = [];

                encode(data, button);
                encode(data, pos.x);
                encode(data, pos.y);

                self.send('\x1b[M' + String.fromCharCode.apply(String, data));
            }

            function getButton(ev) {
                var button
                    , shift
                    , meta
                    , ctrl
                    , mod;

                // two low bits:
                // 0 = left
                // 1 = middle
                // 2 = right
                // 3 = release
                // wheel up/down:
                // 1, and 2 - with 64 added
                switch (ev.type) {
                    case 'mousedown':
                        button = ev.button != null
                            ? +ev.button
                            : ev.which != null
                                ? ev.which - 1
                                : null;

                        if (self.isMSIE) {
                            button = button === 1 ? 0 : button === 4 ? 1 : button;
                        }
                        break;
                    case 'mouseup':
                        button = 3;
                        break;
                    case 'DOMMouseScroll':
                        button = ev.detail < 0
                            ? 64
                            : 65;
                        break;
                    case 'mousewheel':
                        button = ev.wheelDeltaY > 0
                            ? 64
                            : 65;
                        break;
                }

                // next three bits are the modifiers:
                // 4 = shift, 8 = meta, 16 = control
                shift = ev.shiftKey ? 4 : 0;
                meta = ev.metaKey ? 8 : 0;
                ctrl = ev.ctrlKey ? 16 : 0;
                mod = shift | meta | ctrl;

                // no mods
                if (self.vt200Mouse) {
                    // ctrl only
                    mod &= ctrl;
                } else if (!self.normalMouse) {
                    mod = 0;
                }

                // increment to SP
                button = (32 + (mod << 2)) + button;

                return button;
            }

            // mouse coordinates measured in cols/rows
            function getCoords(ev) {
                var x, y, w, h, el;

                // ignore browsers without pageX for now
                if (ev.pageX == null) return;

                x = ev.pageX;
                y = ev.pageY;
                el = self.el;

                // should probably check offsetParent
                // but this is more portable
                while (el && el !== self.document.documentElement) {
                    x -= el.offsetLeft;
                    y -= el.offsetTop;
                    el = 'offsetParent' in el
                        ? el.offsetParent
                        : el.parentNode;
                }

                // convert to cols/rows
                w = self.el.clientWidth;
                h = self.el.clientHeight;
                x = Math.round((x / w) * self.cols);
                y = Math.round((y / h) * self.rows);

                // be sure to avoid sending
                // bad positions to the program
                if (x < 0) x = 0;
                if (x > self.cols) x = self.cols;
                if (y < 0) y = 0;
                if (y > self.rows) y = self.rows;

                // xterm sends raw bytes and
                // starts at 32 (SP) for each.
                x += 32;
                y += 32;

                return {
                    x: x,
                    y: y,
                    type: ev.type === wheelEvent
                        ? 'mousewheel'
                        : ev.type
                };
            }

            // TODO: move all bindings to tab
            on(el, 'mousedown', function(ev) {
                if (!self.mouseEvents) return;

                // send the button
                sendButton(ev);

                // ensure focus
                self.focus();

                // fix for odd bug
                //if (self.vt200Mouse && !self.normalMouse) {
                if (self.vt200Mouse) {
                    sendButton({ __proto__: ev, type: 'mouseup' });
                    return cancel(ev);
                }

                // bind events
                if (self.normalMouse) on(self.document, 'mousemove', sendMove);

                // x10 compatibility mode can't send button releases
                if (!self.x10Mouse) {
                    on(self.document, 'mouseup', function up(ev) {
                        sendButton(ev);
                        if (self.normalMouse) off(self.document, 'mousemove', sendMove);
                        off(self.document, 'mouseup', up);
                        return cancel(ev);
                    });
                }

                return cancel(ev);
            });

            //if (self.normalMouse) {
            //    on(self.document, 'mousemove', sendMove);
            //}

            on(el, wheelEvent, function(ev) {
                if (!self.mouseEvents) return;
                if (self.x10Mouse
                        || self.vt300Mouse
                        || self.decLocator) return;
                sendButton(ev);
                return cancel(ev);
            });

            // allow mousewheel scrolling in
            // the shell for example
            on(el, wheelEvent, function(ev) {
                if (self.mouseEvents) return;
                //if (self.applicationKeypad) return;
                if (ev.type === 'DOMMouseScroll') {
                    self.scrollDisp(ev.detail < 0 ? -SCROLL_SIZE : SCROLL_SIZE);
                } else {
                    self.scrollDisp(ev.wheelDeltaY > 0 ? -SCROLL_SIZE : SCROLL_SIZE);
                }
                return cancel(ev);
            });
        },

        /**
         * Destroy Terminal
         */

        destroy : function() {
            this.readable = false;
            this.writable = false;
            this._events = {};
            this.handler = function() {};
            this.write = function() {};
            if (this.el.parentNode) {
                this.el.parentNode.removeChild(this.el);
            }
            //this.trigger('close');
        },

        /**
         * Rendering Engine
         */

        // In the screen buffer, each character
        // is stored as a an array with a character
        // and a 32-bit integer.
        // First value: a utf-16 character.
        // Second value:
        // Next 9 bits: background color (0-511).
        // Next 9 bits: foreground color (0-511).
        // Next 14 bits: a mask for misc. flags:
        //     1=bold, 2=underline, 4=blink, 8=inverse, 16=invisible

        refresh : function(start, end) {
            var x
                , y
                , i
                , line
                , out
                , ch
                , width
                , data
                , attr
                , fgColor
                , bgColor
                , flags
                , row
                , parent;

//            if (end - start >= this.rows / 2) {
//                parent = this.el.parentNode;
//                if (parent) parent.removeChild(this.el);
//            }

            width = this.cols;
            y = start;

            if (end >= this.lines.length) {
                this.log('`end` is too large. Most likely a bad CSR.');
                end = this.lines.length - 1;
            }

            for (; y <= end; y++) {
                row = y + this.ydisp;

                line = this.lines[row];
                out = '';

                if (y === this.y
                        && this.cursorState
                        && (this.ydisp === this.ybase || this.selectMode)
                        && !this.cursorHidden) {
                    x = this.x;
                } else {
                    x = -1;
                }

                attr = this.defAttr;
                i = 0;

                if (!line) break;
                for (; i < width; i++) {
                    if (!line[i]) break;
                    data = line[i][0];
                    ch = line[i][1];

                    if (i === x) data = -1;

                    if (data !== attr) {
                        if (attr !== this.defAttr) {
                            out += '</span>';
                        }
                        if (data !== this.defAttr) {
                            if (data === -1) {
                                out += '<span class="reverse-video terminal-cursor">';
                            } else {
                                out += '<span style="';

                                bgColor = data & 0x1ff;
                                fgColor = (data >> 9) & 0x1ff;
                                flags = data >> 18;

                                // bold
                                if (flags & 1) {
                                    if (!Terminal.brokenBold) {
                                        out += 'font-weight:bold;';
                                    }
                                    // See: XTerm*boldColors
                                    if (fgColor < 8) fgColor += 8;
                                }

                                // underline
                                if (flags & 2) {
                                    out += 'text-decoration:underline;';
                                }

                                // blink
                                if (flags & 4) {
                                    if (flags & 2) {
                                        out = out.slice(0, -1);
                                        out += ' blink;';
                                    } else {
                                        out += 'text-decoration:blink;';
                                    }
                                }

                                // inverse
                                if (flags & 8) {
                                    bgColor = (data >> 9) & 0x1ff;
                                    fgColor = data & 0x1ff;
                                    // Should inverse just be before the
                                    // above boldColors effect instead?
                                    if ((flags & 1) && fgColor < 8) fgColor += 8;
                                }

                                // invisible
                                if (flags & 16) {
                                    out += 'visibility:hidden;';
                                }

                                if (bgColor !== 256) {
                                    out += 'background-color:'
                                        + this.colors[bgColor]
                                        + ';';
                                }

                                if (fgColor !== 257) {
                                    out += 'color:'
                                        + this.colors[fgColor]
                                        + ';';
                                }

                                out += '">';
                            }
                        }
                    }

                    switch (ch) {
                        case '&':
                            out += '&amp;';
                            break;
                        case '<':
                            out += '&lt;';
                            break;
                        case '>':
                            out += '&gt;';
                            break;
                        default:
                            if (ch <= ' ') {
                                out += '&nbsp;';
                            } else {
                                if (isWide(ch)) i++;
                                out += ch;
                            }
                            break;
                    }

                    attr = data;
                }

                if (attr !== this.defAttr) {
                    out += '</span>';
                }

                if (!this.children[y]) {
                    break;
                }
                this.children[y].innerHTML = out;
            }

            if (parent) parent.appendChild(this.el);
        },

        _cursorBlink : function() {
            if (Terminal.prototype.focusedTerminal !== this) return;
            this.cursorState ^= 1;
            this.refresh(this.y, this.y);
        },

        showCursor : function() {
            if (!this.cursorState) {
                this.cursorState = 1;
                this.refresh(this.y, this.y);
            } else {
                // Temporarily disabled:
                // this.refreshBlink();
            }
        },

        startBlink : function() {
            if (!this.cursorBlink) return;
            var self = this;
            this._blinker = function() {
                self._cursorBlink();
            };
            this._blink = setInterval(this._blinker, 500);
        },

        refreshBlink : function() {
            if (!this.cursorBlink) return;
            clearInterval(this._blink);
            this._blink = setInterval(this._blinker, 500);
        },

        scroll : function() {
            var row;

            if (++this.ybase === this.scrollback) {
                this.ybase = this.ybase / 2 | 0;
                this.lines = this.lines.slice(-(this.ybase + this.rows) + 1);
            }

            this.ydisp = this.ybase;

            // last line
            row = this.ybase + this.rows - 1;

            // subtract the bottom scroll region
            row -= this.rows - 1 - this.scrollBottom;

            if (row === this.lines.length) {
                // potential optimization:
                // pushing is faster than splicing
                // when they amount to the same
                // behavior.
                this.lines.push(this.blankLine());
            } else {
                // add our new line
                this.lines.splice(row, 0, this.blankLine());
            }

            if (this.scrollTop !== 0) {
                if (this.ybase !== 0) {
                    this.ybase--;
                    this.ydisp = this.ybase;
                }
                this.lines.splice(this.ybase + this.scrollTop, 1);
            }

            // this.maxRange();
            this.updateRange(this.scrollTop);
            this.updateRange(this.scrollBottom);
        },

        scrollDisp : function(disp) {
            this.ydisp += disp;

            if (this.ydisp > this.ybase) {
                this.ydisp = this.ybase;
            } else if (this.ydisp < 0) {
                this.ydisp = 0;
            }

            this.refresh(0, this.rows - 1);
        },

        write : function(data) {
            var l = data.length
                , i = 0
                , j
                , cs
                , ch;

            this.refreshStart = this.y;
            this.refreshEnd = this.y;

            if (this.ybase !== this.ydisp) {
                this.ydisp = this.ybase;
                this.maxRange();
            }

            // this.log(JSON.stringify(data.replace(/\x1b/g, '^[')));

            for (; i < l; i++) {
                ch = data[i];
                switch (this.state) {
                    case normal:
                        switch (ch) {
                            // '\0'
                            // case '\0':
                            // case '\200':
                            //     break;

                            // '\a'
                            case '\x07':
                                this.bell();
                                break;

                            // '\n', '\v', '\f'
                            case '\n':
                            case '\x0b':
                            case '\x0c':
                                if (this.convertEol) {
                                    this.x = 0;
                                }
                                // TODO: Implement eat_newline_glitch.
                                // if (this.realX >= this.cols) break;
                                // this.realX = 0;
                                this.y++;
                                if (this.y > this.scrollBottom) {
                                    this.y--;
                                    this.scroll();
                                }
                                break;

                            // '\r'
                            case '\r':
                                this.x = 0;
                                break;

                            // '\b'
                            case '\x08':
                                if (this.x > 0) {
                                    this.x--;
                                }
                                break;

                            // '\t'
                            case '\t':
                                this.x = this.nextStop();
                                break;

                            // shift out
                            case '\x0e':
                                this.setgLevel(1);
                                break;

                            // shift in
                            case '\x0f':
                                this.setgLevel(0);
                                break;

                            // '\e'
                            case '\x1b':
                                this.state = escaped;
                                break;

                            default:
                                // ' '
                                if (ch >= ' ') {
                                    if (this.charset && this.charset[ch]) {
                                        ch = this.charset[ch];
                                    }

                                    if (this.x >= this.cols) {
                                        this.x = 0;
                                        this.y++;
                                        if (this.y > this.scrollBottom) {
                                            this.y--;
                                            this.scroll();
                                        }
                                    }

                                    var row = this.lines[this.y + this.ybase];
                                    if (!row || !row[this.x]) {
                                        return;
                                    }
                                    row[this.x] = [this.curAttr, ch];
                                    this.x++;
                                    this.updateRange(this.y);

                                    if (isWide(ch)) {
                                        j = this.y + this.ybase;
                                        if (this.cols < 2 || this.x >= this.cols) {
                                            this.lines[j][this.x - 1] = [this.curAttr, ' '];
                                            break;
                                        }
                                        this.lines[j][this.x] = [this.curAttr, ' '];
                                        this.x++;
                                    }
                                }
                                break;
                        }
                        break;
                    case escaped:
                        switch (ch) {
                            // ESC [ Control Sequence Introducer ( CSI is 0x9b).
                            case '[':
                                this.params = [];
                                this.currentParam = 0;
                                this.state = csi;
                                break;

                            // ESC ] Operating System Command ( OSC is 0x9d).
                            case ']':
                                this.params = [];
                                this.currentParam = 0;
                                this.state = osc;
                                break;

                            // ESC P Device Control String ( DCS is 0x90).
                            case 'P':
                                this.params = [];
                                this.currentParam = 0;
                                this.state = dcs;
                                break;

                            // ESC _ Application Program Command ( APC is 0x9f).
                            case '_':
                                this.state = ignore;
                                break;

                            // ESC ^ Privacy Message ( PM is 0x9e).
                            case '^':
                                this.state = ignore;
                                break;

                            // ESC c Full Reset (RIS).
                            case 'c':
                                this.reset();
                                break;

                            // ESC E Next Line ( NEL is 0x85).
                            // ESC D Index ( IND is 0x84).
                            case 'E':
                                this.x = 0;
                                ;
                            case 'D':
                                this.index();
                                break;

                            // ESC M Reverse Index ( RI is 0x8d).
                            case 'M':
                                this.reverseIndex();
                                break;

                            // ESC % Select default/utf-8 character set.
                            // @ = default, G = utf-8
                            case '%':
                                //this.charset = null;
                                this.setgLevel(0);
                                this.setgCharset(0, Terminal.prototype.charsets.US);
                                this.state = normal;
                                i++;
                                break;

                            // ESC (,),*,+,-,. Designate G0-G2 Character Set.
                            case '(': // <-- this seems to get all the attention
                            case ')':
                            case '*':
                            case '+':
                            case '-':
                            case '.':
                                switch (ch) {
                                    case '(':
                                        this.gcharset = 0;
                                        break;
                                    case ')':
                                        this.gcharset = 1;
                                        break;
                                    case '*':
                                        this.gcharset = 2;
                                        break;
                                    case '+':
                                        this.gcharset = 3;
                                        break;
                                    case '-':
                                        this.gcharset = 1;
                                        break;
                                    case '.':
                                        this.gcharset = 2;
                                        break;
                                }
                                this.state = charset;
                                break;

                            // Designate G3 Character Set (VT300).
                            // A = ISO Latin-1 Supplemental.
                            // Not implemented.
                            case '/':
                                this.gcharset = 3;
                                this.state = charset;
                                i--;
                                break;

                            // ESC N
                            // Single Shift Select of G2 Character Set
                            // ( SS2 is 0x8e). This affects next character only.
                            case 'N':
                                break;
                            // ESC O
                            // Single Shift Select of G3 Character Set
                            // ( SS3 is 0x8f). This affects next character only.
                            case 'O':
                                break;
                            // ESC n
                            // Invoke the G2 Character Set as GL (LS2).
                            case 'n':
                                this.setgLevel(2);
                                break;
                            // ESC o
                            // Invoke the G3 Character Set as GL (LS3).
                            case 'o':
                                this.setgLevel(3);
                                break;
                            // ESC |
                            // Invoke the G3 Character Set as GR (LS3R).
                            case '|':
                                this.setgLevel(3);
                                break;
                            // ESC }
                            // Invoke the G2 Character Set as GR (LS2R).
                            case '}':
                                this.setgLevel(2);
                                break;
                            // ESC ~
                            // Invoke the G1 Character Set as GR (LS1R).
                            case '~':
                                this.setgLevel(1);
                                break;

                            // ESC 7 Save Cursor (DECSC).
                            case '7':
                                this.saveCursor();
                                this.state = normal;
                                break;

                            // ESC 8 Restore Cursor (DECRC).
                            case '8':
                                this.restoreCursor();
                                this.state = normal;
                                break;

                            // ESC # 3 DEC line height/width
                            case '#':
                                this.state = normal;
                                i++;
                                break;

                            // ESC H Tab Set (HTS is 0x88).
                            case 'H':
                                this.tabSet();
                                break;

                            // ESC = Application Keypad (DECPAM).
                            case '=':
                                this.log('Serial port requested application keypad.');
                                this.applicationKeypad = true;
                                this.state = normal;
                                break;

                            // ESC > Normal Keypad (DECPNM).
                            case '>':
                                this.log('Switching back to normal keypad.');
                                this.applicationKeypad = false;
                                this.state = normal;
                                break;

                            default:
                                this.state = normal;
                                this.error('Unknown ESC control: %s.', ch);
                                break;
                        }
                        break;

                    case charset:
                        var charsets = Terminal.prototype.charsets;
                        switch (ch) {
                            case '0': // DEC Special Character and Line Drawing Set.
                                cs = charsets.SCLD;
                                break;
                            case 'A': // UK
                                cs = charsets.UK;
                                break;
                            case 'B': // United States (USASCII).
                                cs = charsets.US;
                                break;
                            case '4': // Dutch
                                cs = charsets.Dutch;
                                break;
                            case 'C': // Finnish
                            case '5':
                                cs = charsets.Finnish;
                                break;
                            case 'R': // French
                                cs = charsets.French;
                                break;
                            case 'Q': // FrenchCanadian
                                cs = charsets.FrenchCanadian;
                                break;
                            case 'K': // German
                                cs = charsets.German;
                                break;
                            case 'Y': // Italian
                                cs = charsets.Italian;
                                break;
                            case 'E': // NorwegianDanish
                            case '6':
                                cs = charsets.NorwegianDanish;
                                break;
                            case 'Z': // Spanish
                                cs = charsets.Spanish;
                                break;
                            case 'H': // Swedish
                            case '7':
                                cs = charsets.Swedish;
                                break;
                            case '=': // Swiss
                                cs = charsets.Swiss;
                                break;
                            case '/': // ISOLatin (actually /A)
                                cs = charsets.ISOLatin;
                                i++;
                                break;
                            default: // Default
                                cs = charsets.US;
                                break;
                        }
                        this.setgCharset(this.gcharset, cs);
                        this.gcharset = null;
                        this.state = normal;
                        break;

                    case osc:
                        // OSC Ps ; Pt ST
                        // OSC Ps ; Pt BEL
                        //     Set Text Parameters.
                        if (ch === '\x1b' || ch === '\x07') {
                            if (ch === '\x1b') i++;

                            this.params.push(this.currentParam);

                            switch (this.params[0]) {
                                case 0:
                                case 1:
                                case 2:
                                    // TODO: fix this
                                    if (this.params[1]) {
                                        this.title = this.params[1];
                                        this.handleTitle(this.title);
                                    }
                                    break;
                                case 3:
                                    // set X property
                                    break;
                                case 4:
                                case 5:
                                    // change dynamic colors
                                    break;
                                case 10:
                                case 11:
                                case 12:
                                case 13:
                                case 14:
                                case 15:
                                case 16:
                                case 17:
                                case 18:
                                case 19:
                                    // change dynamic ui colors
                                    break;
                                case 46:
                                    // change log file
                                    break;
                                case 50:
                                    // dynamic font
                                    break;
                                case 51:
                                    // emacs shell
                                    break;
                                case 52:
                                    // manipulate selection data
                                    break;
                                case 104:
                                case 105:
                                case 110:
                                case 111:
                                case 112:
                                case 113:
                                case 114:
                                case 115:
                                case 116:
                                case 117:
                                case 118:
                                    // reset colors
                                    break;
                            }

                            this.params = [];
                            this.currentParam = 0;
                            this.state = normal;
                        } else {
                            if (!this.params.length) {
                                if (ch >= '0' && ch <= '9') {
                                    this.currentParam =
                                        this.currentParam * 10 + ch.charCodeAt(0) - 48;
                                } else if (ch === ';') {
                                    this.params.push(this.currentParam);
                                    this.currentParam = '';
                                }
                            } else {
                                this.currentParam += ch;
                            }
                        }
                        break;

                    case csi:
                        // '?', '>', '!'
                        if (ch === '?' || ch === '>' || ch === '!') {
                            this.prefix = ch;
                            break;
                        }

                        // 0 - 9
                        if (ch >= '0' && ch <= '9') {
                            this.currentParam = this.currentParam * 10 + ch.charCodeAt(0) - 48;
                            break;
                        }

                        // '$', '"', ' ', '\''
                        if (ch === '$' || ch === '"' || ch === ' ' || ch === '\'') {
                            this.postfix = ch;
                            break;
                        }

                        this.params.push(this.currentParam);
                        this.currentParam = 0;

                        // ';'
                        if (ch === ';') break;

                        this.state = normal;

                        switch (ch) {
                            // CSI Ps A
                            // Cursor Up Ps Times (default = 1) (CUU).
                            case 'A':
                                this.cursorUp(this.params);
                                break;

                            // CSI Ps B
                            // Cursor Down Ps Times (default = 1) (CUD).
                            case 'B':
                                this.cursorDown(this.params);
                                break;

                            // CSI Ps C
                            // Cursor Forward Ps Times (default = 1) (CUF).
                            case 'C':
                                this.cursorForward(this.params);
                                break;

                            // CSI Ps D
                            // Cursor Backward Ps Times (default = 1) (CUB).
                            case 'D':
                                this.cursorBackward(this.params);
                                break;

                            // CSI Ps ; Ps H
                            // Cursor Position [row;column] (default = [1,1]) (CUP).
                            case 'H':
                                this.cursorPos(this.params);
                                break;

                            // CSI Ps J    Erase in Display (ED).
                            case 'J':
                                this.eraseInDisplay(this.params);
                                break;

                            // CSI Ps K    Erase in Line (EL).
                            case 'K':
                                this.eraseInLine(this.params);
                                break;

                            // CSI Pm m    Character Attributes (SGR).
                            case 'm':
                                this.charAttributes(this.params);
                                break;

                            // CSI Ps n    Device Status Report (DSR).
                            case 'n':
                                this.deviceStatus(this.params);
                                break;

                            /**
                             * Additions
                             */

                            // CSI Ps @
                            // Insert Ps (Blank) Character(s) (default = 1) (ICH).
                            case '@':
                                this.insertChars(this.params);
                                break;

                            // CSI Ps E
                            // Cursor Next Line Ps Times (default = 1) (CNL).
                            case 'E':
                                this.cursorNextLine(this.params);
                                break;

                            // CSI Ps F
                            // Cursor Preceding Line Ps Times (default = 1) (CNL).
                            case 'F':
                                this.cursorPrecedingLine(this.params);
                                break;

                            // CSI Ps G
                            // Cursor Character Absolute    [column] (default = [row,1]) (CHA).
                            case 'G':
                                this.cursorCharAbsolute(this.params);
                                break;

                            // CSI Ps L
                            // Insert Ps Line(s) (default = 1) (IL).
                            case 'L':
                                this.insertLines(this.params);
                                break;

                            // CSI Ps M
                            // Delete Ps Line(s) (default = 1) (DL).
                            case 'M':
                                this.deleteLines(this.params);
                                break;

                            // CSI Ps P
                            // Delete Ps Character(s) (default = 1) (DCH).
                            case 'P':
                                this.deleteChars(this.params);
                                break;

                            // CSI Ps X
                            // Erase Ps Character(s) (default = 1) (ECH).
                            case 'X':
                                this.eraseChars(this.params);
                                break;

                            // CSI Pm `    Character Position Absolute
                            //     [column] (default = [row,1]) (HPA).
                            case '`':
                                this.charPosAbsolute(this.params);
                                break;

                            // 141 61 a * HPR -
                            // Horizontal Position Relative
                            case 'a':
                                this.HPositionRelative(this.params);
                                break;

                            // CSI P s c
                            // Send Device Attributes (Primary DA).
                            // CSI > P s c
                            // Send Device Attributes (Secondary DA)
                            case 'c':
                                this.sendDeviceAttributes(this.params);
                                break;

                            // CSI Pm d
                            // Line Position Absolute    [row] (default = [1,column]) (VPA).
                            case 'd':
                                this.linePosAbsolute(this.params);
                                break;

                            // 145 65 e * VPR - Vertical Position Relative
                            case 'e':
                                this.VPositionRelative(this.params);
                                break;

                            // CSI Ps ; Ps f
                            //     Horizontal and Vertical Position [row;column] (default =
                            //     [1,1]) (HVP).
                            case 'f':
                                this.HVPosition(this.params);
                                break;

                            // CSI Pm h    Set Mode (SM).
                            // CSI ? Pm h - mouse escape codes, cursor escape codes
                            case 'h':
                                this.setMode(this.params);
                                break;

                            // CSI Pm l    Reset Mode (RM).
                            // CSI ? Pm l
                            case 'l':
                                this.resetMode(this.params);
                                break;

                            // CSI Ps ; Ps r
                            //     Set Scrolling Region [top;bottom] (default = full size of win-
                            //     dow) (DECSTBM).
                            // CSI ? Pm r
                            case 'r':
                                this.setScrollRegion(this.params);
                                break;

                            // CSI s
                            //     Save cursor (ANSI.SYS).
                            case 's':
                                this.saveCursor(this.params);
                                break;

                            // CSI u
                            //     Restore cursor (ANSI.SYS).
                            case 'u':
                                this.restoreCursor(this.params);
                                break;

                            /**
                             * Lesser Used
                             */

                            // CSI Ps I
                            // Cursor Forward Tabulation Ps tab stops (default = 1) (CHT).
                            case 'I':
                                this.cursorForwardTab(this.params);
                                break;

                            // CSI Ps S    Scroll up Ps lines (default = 1) (SU).
                            case 'S':
                                this.scrollUp(this.params);
                                break;

                            // CSI Ps T    Scroll down Ps lines (default = 1) (SD).
                            // CSI Ps ; Ps ; Ps ; Ps ; Ps T
                            // CSI > Ps; Ps T
                            case 'T':
                                // if (this.prefix === '>') {
                                //     this.resetTitleModes(this.params);
                                //     break;
                                // }
                                // if (this.params.length > 2) {
                                //     this.initMouseTracking(this.params);
                                //     break;
                                // }
                                if (this.params.length < 2 && !this.prefix) {
                                    this.scrollDown(this.params);
                                }
                                break;

                            // CSI Ps Z
                            // Cursor Backward Tabulation Ps tab stops (default = 1) (CBT).
                            case 'Z':
                                this.cursorBackwardTab(this.params);
                                break;

                            // CSI Ps b    Repeat the preceding graphic character Ps times (REP).
                            case 'b':
                                this.repeatPrecedingCharacter(this.params);
                                break;

                            // CSI Ps g    Tab Clear (TBC).
                            case 'g':
                                this.tabClear(this.params);
                                break;

                            // CSI Pm i    Media Copy (MC).
                            // CSI ? Pm i
                            // case 'i':
                            //     this.mediaCopy(this.params);
                            //     break;

                            // CSI Pm m    Character Attributes (SGR).
                            // CSI > Ps; Ps m
                            // case 'm': // duplicate
                            //     if (this.prefix === '>') {
                            //         this.setResources(this.params);
                            //     } else {
                            //         this.charAttributes(this.params);
                            //     }
                            //     break;

                            // CSI Ps n    Device Status Report (DSR).
                            // CSI > Ps n
                            // case 'n': // duplicate
                            //     if (this.prefix === '>') {
                            //         this.disableModifiers(this.params);
                            //     } else {
                            //         this.deviceStatus(this.params);
                            //     }
                            //     break;

                            // CSI > Ps p    Set pointer mode.
                            // CSI ! p     Soft terminal reset (DECSTR).
                            // CSI Ps$ p
                            //     Request ANSI mode (DECRQM).
                            // CSI ? Ps$ p
                            //     Request DEC private mode (DECRQM).
                            // CSI Ps ; Ps " p
                            case 'p':
                                switch (this.prefix) {
                                    // case '>':
                                    //     this.setPointerMode(this.params);
                                    //     break;
                                    case '!':
                                        this.softReset(this.params);
                                        break;
                                    // case '?':
                                    //     if (this.postfix === '$') {
                                    //         this.requestPrivateMode(this.params);
                                    //     }
                                    //     break;
                                    // default:
                                    //     if (this.postfix === '"') {
                                    //         this.setConformanceLevel(this.params);
                                    //     } else if (this.postfix === '$') {
                                    //         this.requestAnsiMode(this.params);
                                    //     }
                                    //     break;
                                }
                                break;

                            // CSI Ps q    Load LEDs (DECLL).
                            // CSI Ps SP q
                            // CSI Ps " q
                            // case 'q':
                            //     if (this.postfix === ' ') {
                            //         this.setCursorStyle(this.params);
                            //         break;
                            //     }
                            //     if (this.postfix === '"') {
                            //         this.setCharProtectionAttr(this.params);
                            //         break;
                            //     }
                            //     this.loadLEDs(this.params);
                            //     break;

                            // CSI Ps ; Ps r
                            //     Set Scrolling Region [top;bottom] (default = full size of win-
                            //     dow) (DECSTBM).
                            // CSI ? Pm r
                            // CSI Pt; Pl; Pb; Pr; Ps$ r
                            // case 'r': // duplicate
                            //     if (this.prefix === '?') {
                            //         this.restorePrivateValues(this.params);
                            //     } else if (this.postfix === '$') {
                            //         this.setAttrInRectangle(this.params);
                            //     } else {
                            //         this.setScrollRegion(this.params);
                            //     }
                            //     break;

                            // CSI s         Save cursor (ANSI.SYS).
                            // CSI ? Pm s
                            // case 's': // duplicate
                            //     if (this.prefix === '?') {
                            //         this.savePrivateValues(this.params);
                            //     } else {
                            //         this.saveCursor(this.params);
                            //     }
                            //     break;

                            // CSI Ps ; Ps ; Ps t
                            // CSI Pt; Pl; Pb; Pr; Ps$ t
                            // CSI > Ps; Ps t
                            // CSI Ps SP t
                            // case 't':
                            //     if (this.postfix === '$') {
                            //         this.reverseAttrInRectangle(this.params);
                            //     } else if (this.postfix === ' ') {
                            //         this.setWarningBellVolume(this.params);
                            //     } else {
                            //         if (this.prefix === '>') {
                            //             this.setTitleModeFeature(this.params);
                            //         } else {
                            //             this.manipulateWindow(this.params);
                            //         }
                            //     }
                            //     break;

                            // CSI u         Restore cursor (ANSI.SYS).
                            // CSI Ps SP u
                            // case 'u': // duplicate
                            //     if (this.postfix === ' ') {
                            //         this.setMarginBellVolume(this.params);
                            //     } else {
                            //         this.restoreCursor(this.params);
                            //     }
                            //     break;

                            // CSI Pt; Pl; Pb; Pr; Pp; Pt; Pl; Pp$ v
                            // case 'v':
                            //     if (this.postfix === '$') {
                            //         this.copyRectagle(this.params);
                            //     }
                            //     break;

                            // CSI Pt ; Pl ; Pb ; Pr ' w
                            // case 'w':
                            //     if (this.postfix === '\'') {
                            //         this.enableFilterRectangle(this.params);
                            //     }
                            //     break;

                            // CSI Ps x    Request Terminal Parameters (DECREQTPARM).
                            // CSI Ps x    Select Attribute Change Extent (DECSACE).
                            // CSI Pc; Pt; Pl; Pb; Pr$ x
                            // case 'x':
                            //     if (this.postfix === '$') {
                            //         this.fillRectangle(this.params);
                            //     } else {
                            //         this.requestParameters(this.params);
                            //         //this.__(this.params);
                            //     }
                            //     break;

                            // CSI Ps ; Pu ' z
                            // CSI Pt; Pl; Pb; Pr$ z
                            // case 'z':
                            //     if (this.postfix === '\'') {
                            //         this.enableLocatorReporting(this.params);
                            //     } else if (this.postfix === '$') {
                            //         this.eraseRectangle(this.params);
                            //     }
                            //     break;

                            // CSI Pm ' {
                            // CSI Pt; Pl; Pb; Pr$ {
                            // case '{':
                            //     if (this.postfix === '\'') {
                            //         this.setLocatorEvents(this.params);
                            //     } else if (this.postfix === '$') {
                            //         this.selectiveEraseRectangle(this.params);
                            //     }
                            //     break;

                            // CSI Ps ' |
                            // case '|':
                            //     if (this.postfix === '\'') {
                            //         this.requestLocatorPosition(this.params);
                            //     }
                            //     break;

                            // CSI P m SP }
                            // Insert P s Column(s) (default = 1) (DECIC), VT420 and up.
                            // case '}':
                            //     if (this.postfix === ' ') {
                            //         this.insertColumns(this.params);
                            //     }
                            //     break;

                            // CSI P m SP ~
                            // Delete P s Column(s) (default = 1) (DECDC), VT420 and up
                            // case '~':
                            //     if (this.postfix === ' ') {
                            //         this.deleteColumns(this.params);
                            //     }
                            //     break;

                            default:
                                this.error('Unknown CSI code: %s.', ch);
                                break;
                        }

                        this.prefix = '';
                        this.postfix = '';
                        break;

                    case dcs:
                        if (ch === '\x1b' || ch === '\x07') {
                            if (ch === '\x1b') i++;

                            switch (this.prefix) {
                                // User-Defined Keys (DECUDK).
                                case '':
                                    break;

                                // Request Status String (DECRQSS).
                                // test: echo -e '\eP$q"p\e\\'
                                case '$q':
                                    var pt = this.currentParam
                                        , valid = false;

                                    switch (pt) {
                                        // DECSCA
                                        case '"q':
                                            pt = '0"q';
                                            break;

                                        // DECSCL
                                        case '"p':
                                            pt = '61"p';
                                            break;

                                        // DECSTBM
                                        case 'r':
                                            pt = ''
                                                + (this.scrollTop + 1)
                                                + ';'
                                                + (this.scrollBottom + 1)
                                                + 'r';
                                            break;

                                        // SGR
                                        case 'm':
                                            pt = '0m';
                                            break;

                                        default:
                                            this.error('Unknown DCS Pt: %s.', pt);
                                            pt = '';
                                            break;
                                    }

                                    this.send('\x1bP' + +valid + '$r' + pt + '\x1b\\');
                                    break;

                                // Set Termcap/Terminfo Data (xterm, experimental).
                                case '+p':
                                    break;

                                // Request Termcap/Terminfo String (xterm, experimental)
                                // Regular xterm does not even respond to this sequence.
                                // This can cause a small glitch in vim.
                                // test: echo -ne '\eP+q6b64\e\\'
                                case '+q':
                                    var pt = this.currentParam
                                        , valid = false;

                                    this.send('\x1bP' + +valid + '+r' + pt + '\x1b\\');
                                    break;

                                default:
                                    this.error('Unknown DCS prefix: %s.', this.prefix);
                                    break;
                            }

                            this.currentParam = 0;
                            this.prefix = '';
                            this.state = normal;
                        } else if (!this.currentParam) {
                            if (!this.prefix && ch !== '$' && ch !== '+') {
                                this.currentParam = ch;
                            } else if (this.prefix.length === 2) {
                                this.currentParam = ch;
                            } else {
                                this.prefix += ch;
                            }
                        } else {
                            this.currentParam += ch;
                        }
                        break;

                    case ignore:
                        // For PM and APC.
                        if (ch === '\x1b' || ch === '\x07') {
                            if (ch === '\x1b') i++;
                            this.state = normal;
                        }
                        break;
                }
            }

            this.updateRange(this.y);
            this.refresh(this.refreshStart, this.refreshEnd);
        },

        writeln : function(data) {
            this.write(data + '\r\n');
        },

        // Key Resources:
        // https://developer.mozilla.org/en-US/docs/DOM/KeyboardEvent
        keyDown : function(ev) {
            var self = this
                , key;

            switch (ev.keyCode) {
                // backspace
                case 8:
                    if (ev.shiftKey) {
                        key = '\x08'; // ^H
                        break;
                    }
                    key = '\x7f'; // ^?
                    break;
                // tab
                case 9:
                    if (ev.shiftKey) {
                        key = '\x1b[Z';
                        break;
                    }
                    key = '\t';
                    break;
                // return/enter
                case 13:
                    key = '\r';
                    break;
                // escape
                case 27:
                    key = '\x1b';
                    break;
                // left-arrow
                case 37:
                    if (this.applicationCursor) {
                        key = '\x1bOD'; // SS3 as ^[O for 7-bit
                        //key = '\x8fD'; // SS3 as 0x8f for 8-bit
                        break;
                    }
                    key = '\x1b[D';
                    break;
                // right-arrow
                case 39:
                    if (this.applicationCursor) {
                        key = '\x1bOC';
                        break;
                    }
                    key = '\x1b[C';
                    break;
                // up-arrow
                case 38:
                    if (this.applicationCursor) {
                        key = '\x1bOA';
                        break;
                    }
                    if (ev.ctrlKey) {
                        this.scrollDisp(-1);
                        return cancel(ev);
                    } else {
                        key = '\x1b[A';
                    }
                    break;
                // down-arrow
                case 40:
                    if (this.applicationCursor) {
                        key = '\x1bOB';
                        break;
                    }
                    if (ev.ctrlKey) {
                        this.scrollDisp(1);
                        return cancel(ev);
                    } else {
                        key = '\x1b[B';
                    }
                    break;
                // delete
                case 46:
                    key = '\x1b[3~';
                    break;
                // insert
                case 45:
                    key = '\x1b[2~';
                    break;
                // home
                case 36:
                    if (this.applicationKeypad) {
                        key = '\x1bOH';
                        break;
                    }
                    key = '\x1bOH';
                    break;
                // end
                case 35:
                    if (this.applicationKeypad) {
                        key = '\x1bOF';
                        break;
                    }
                    key = '\x1bOF';
                    break;
                // page up
                case 33:
                    if (ev.shiftKey) {
                        this.scrollDisp(-(this.rows - 1));
                        return cancel(ev);
                    } else {
                        key = '\x1b[5~';
                    }
                    break;
                // page down
                case 34:
                    if (ev.shiftKey) {
                        this.scrollDisp(this.rows - 1);
                        return cancel(ev);
                    } else {
                        key = '\x1b[6~';
                    }
                    break;
                // F1
                case 112:
                    key = '\x1bOP';
                    break;
                // F2
                case 113:
                    key = '\x1bOQ';
                    break;
                // F3
                case 114:
                    key = '\x1bOR';
                    break;
                // F4
                case 115:
                    key = '\x1bOS';
                    break;
                // F5
                case 116:
                    key = '\x1b[15~';
                    break;
                // F6
                case 117:
                    key = '\x1b[17~';
                    break;
                // F7
                case 118:
                    key = '\x1b[18~';
                    break;
                // F8
                case 119:
                    key = '\x1b[19~';
                    break;
                // F9
                case 120:
                    key = '\x1b[20~';
                    break;
                // F10
                case 121:
                    key = '\x1b[21~';
                    break;
                // F11
                case 122:
                    key = '\x1b[23~';
                    break;
                // F12
                case 123:
                    key = '\x1b[24~';
                    break;
                default:
                    // a-z and space
                    if (ev.ctrlKey) {
                        if (ev.keyCode >= 65 && ev.keyCode <= 90) {
                            // Ctrl-A
                            if (this.screenKeys) {
                                if (!this.prefixMode && !this.selectMode && ev.keyCode === 65) {
                                    this.enterPrefix();
                                    return cancel(ev);
                                }
                            }
                            // Ctrl-V
                            if (this.prefixMode && ev.keyCode === 86) {
                                this.leavePrefix();
                                return;
                            }
                            // Ctrl-C
                            if ((this.prefixMode || this.selectMode) && ev.keyCode === 67) {
                                if (this.visualMode) {
                                    setTimeout(function() {
                                        self.leaveVisual();
                                    }, 1);
                                }
                                return;
                            }
                            key = String.fromCharCode(ev.keyCode - 64);
                        } else if (ev.keyCode === 32) {
                            // NUL
                            key = String.fromCharCode(0);
                        } else if (ev.keyCode >= 51 && ev.keyCode <= 55) {
                            // escape, file sep, group sep, record sep, unit sep
                            key = String.fromCharCode(ev.keyCode - 51 + 27);
                        } else if (ev.keyCode === 56) {
                            // delete
                            key = String.fromCharCode(127);
                        } else if (ev.keyCode === 219) {
                            // ^[ - escape
                            key = String.fromCharCode(27);
                        } else if (ev.keyCode === 221) {
                            // ^] - group sep
                            key = String.fromCharCode(29);
                        }
                    } else if ((!this.isMac && ev.altKey) || (this.isMac && ev.metaKey)) {
                        if (ev.keyCode >= 65 && ev.keyCode <= 90) {
                            key = '\x1b' + String.fromCharCode(ev.keyCode + 32);

                            // explicitly enable copy & paste
                            if (key[1] == 'c' || key[1] == 'v') {
                                // TODO: trick the paste to paste in a paste-able container
                                return true;
                            }
                        } else if (ev.keyCode === 192) {
                            key = '\x1b`';
                        } else if (ev.keyCode >= 48 && ev.keyCode <= 57) {
                            key = '\x1b' + (ev.keyCode - 48);
                        }
                    }
                    break;
            }

            if (!key) return true;

            if (this.prefixMode) {
                this.leavePrefix();
                return cancel(ev);
            }

            if (this.selectMode) {
                this.keySelect(ev, key);
                return cancel(ev);
            }

            // TODO: remove
            // this.trigger('keydown', ev);
            // this.trigger('key', key, ev);

            this.showCursor();
            this.handler(key);

            return cancel(ev);
        },

        setgLevel : function(g) {
            this.glevel = g;
            this.charset = this.charsets[g];
        },

        setgCharset : function(g, charset) {
            this.charsets[g] = charset;
            if (this.glevel === g) {
                this.charset = charset;
            }
        },

        keyPress : function(ev) {
            var key;

            cancel(ev);

            if (ev.charCode) {
                key = ev.charCode;
            } else if (ev.which == null) {
                key = ev.keyCode;
            } else if (ev.which !== 0 && ev.charCode !== 0) {
                key = ev.which;
            } else {
                return false;
            }

            if (!key || ev.ctrlKey || ev.altKey || ev.metaKey) return false;

            key = String.fromCharCode(key);

            if (this.prefixMode) {
                this.leavePrefix();
                this.keyPrefix(ev, key);
                return false;
            }

            if (this.selectMode) {
                this.keySelect(ev, key);
                return false;
            }

            // TODO: remove
            // this.trigger('keypress', key, ev);
            // this.trigger('key', key, ev);

            this.showCursor();
            this.handler(key);

            return false;
        },

        send : function(data) {
            var self = this;

            if (!this.queue) {
                setTimeout(function() {
                    self.handler(self.queue);
                    self.queue = '';
                }, 1);
            }

            this.queue += data;
        },

        bell : function() {
            if (!this.visualBell) return;
            var self = this;
            this.el.style.borderColor = 'white';
            setTimeout(function() {
                self.el.style.borderColor = '';
            }, 10);
            if (this.popOnBell) this.focus();
        },

        log : function() {
            if (!this.debug) return;
            if (!this.context.console || !this.context.console.log) return;
            var args = Array.prototype.slice.call(arguments);
            this.context.console.log.apply(this.context.console, args);
        },

        error : function() {
            if (!this.debug) return;
            if (!this.context.console || !this.context.console.error) return;
            var args = Array.prototype.slice.call(arguments);
            this.context.console.error.apply(this.context.console, args);
        },

        resize : function(x, y) {
            var line
                , el
                , i
                , j
                , ch;

            if (x < 1) x = 1;
            if (y < 1) y = 1;

            // resize cols
            j = this.cols;
            if (j < x) {
                ch = [this.defAttr, ' ']; // does xterm use the default attr?
                i = this.lines.length;
                while (i--) {
                    while (this.lines[i].length < x) {
                        this.lines[i].push(ch);
                    }
                }
            } else if (j > x) {
                i = this.lines.length;
                while (i--) {
                    while (this.lines[i].length > x) {
                        this.lines[i].pop();
                    }
                }
            }
            this.setupStops(j);
            this.cols = x;

            // resize rows
            j = this.rows;
            if (j < y) {
                el = this.el;
                while (j++ < y) {
                    if (this.lines.length < y + this.ybase) {
                        this.lines.push(this.blankLine());
                    }
                    if (this.children.length < y) {
                        line = this.document.createElement('div');
                        el.appendChild(line);
                        this.children.push(line);
                    }
                }
            } else if (j > y) {
                while (j-- > y) {
                    if (this.lines.length > y + this.ybase) {
                        this.lines.pop();
                    }
                    if (this.children.length > y) {
                        el = this.children.pop();
                        if (!el) continue;
                        el.parentNode.removeChild(el);
                    }
                }
            }
            this.rows = y;

            // make sure the cursor stays on screen
            if (this.y >= y) this.y = y - 1;
            if (this.x >= x) this.x = x - 1;

            this.scrollTop = 0;
            this.scrollBottom = y - 1;

            this.refresh(0, this.rows - 1);

            // it's a real nightmare trying
            // to resize the original
            // screen buffer. just set it
            // to null for now.
            this.normal = null;
        },

        updateRange : function(y) {
            if (y < this.refreshStart) this.refreshStart = y;
            if (y > this.refreshEnd) this.refreshEnd = y;
            // if (y > this.refreshEnd) {
            //     this.refreshEnd = y;
            //     if (y > this.rows - 1) {
            //         this.refreshEnd = this.rows - 1;
            //     }
            // }
        },

        maxRange : function() {
            this.refreshStart = 0;
            this.refreshEnd = this.rows - 1;
        },

        setupStops : function(i) {
            if (i != null) {
                if (!this.tabs[i]) {
                    i = this.prevStop(i);
                }
            } else {
                this.tabs = {};
                i = 0;
            }

            for (; i < this.cols; i += 8) {
                this.tabs[i] = true;
            }
        },

        prevStop : function(x) {
            if (x == null) x = this.x;
            while (!this.tabs[--x] && x > 0);
            return x >= this.cols
                ? this.cols - 1
                : x < 0 ? 0 : x;
        },

        nextStop : function(x) {
            if (x == null) x = this.x;
            while (!this.tabs[++x] && x < this.cols);
            return x >= this.cols
                ? this.cols - 1
                : x < 0 ? 0 : x;
        },

        eraseRight : function(x, y) {
            var line = this.lines[this.ybase + y]
                , ch = [this.eraseAttr(), ' ']; // xterm

            if (!line) return;
            for (; x < this.cols; x++) {
                if (!line[x]) return;
                line[x] = ch;
            }

            this.updateRange(y);
        },

        eraseLeft : function(x, y) {
            var line = this.lines[this.ybase + y]
                , ch = [this.eraseAttr(), ' ']; // xterm

            x++;
            while (x--) line[x] = ch;

            this.updateRange(y);
        },

        eraseLine : function(y) {
            this.eraseRight(0, y);
        },

        blankLine : function(cur) {
            var attr = cur
                ? this.eraseAttr()
                : this.defAttr;

            var ch = [attr, ' ']
                , line = []
                , i = 0;

            for (; i < this.cols; i++) {
                line[i] = ch;
            }

            return line;
        },

        ch : function(cur) {
            return cur
                ? [this.eraseAttr(), ' ']
                : [this.defAttr, ' '];
        },

        is : function(term) {
            var name = this.termName;
            return (name + '').indexOf(term) === 0;
        },

        handler : function(data) {
            this.trigger('data', data);
        },

        handleTitle : function(title) {
            this.trigger('title', title);
        },

        /**
         * ESC
         */

        // ESC D Index (IND is 0x84).
        index : function() {
            this.y++;
            if (this.y > this.scrollBottom) {
                this.y--;
                this.scroll();
            }
            this.state = normal;
        },

        // ESC M Reverse Index (RI is 0x8d).
        reverseIndex : function() {
            var j;
            this.y--;
            if (this.y < this.scrollTop) {
                this.y++;
                // possibly move the code below to term.reverseScroll();
                // test: echo -ne '\e[1;1H\e[44m\eM\e[0m'
                // blankLine(true) is xterm/linux behavior
                this.lines.splice(this.y + this.ybase, 0, this.blankLine(true));
                j = this.rows - 1 - this.scrollBottom;
                this.lines.splice(this.rows - 1 + this.ybase - j + 1, 1);
                // this.maxRange();
                this.updateRange(this.scrollTop);
                this.updateRange(this.scrollBottom);
            }
            this.state = normal;
        },

        // ESC c Full Reset (RIS).
        reset : function() {
            //this.initialize(this.options);
            this.refresh(0, this.rows - 1);
        },

        // ESC H Tab Set (HTS is 0x88).
        tabSet : function() {
            this.tabs[this.x] = true;
            this.state = normal;
        },

        /**
         * CSI
         */

        // CSI Ps A
        // Cursor Up Ps Times (default = 1) (CUU).
        cursorUp : function(params) {
            var param = params[0];
            if (param < 1) param = 1;
            this.y -= param;
            if (this.y < 0) this.y = 0;
        },

        // CSI Ps B
        // Cursor Down Ps Times (default = 1) (CUD).
        cursorDown : function(params) {
            var param = params[0];
            if (param < 1) param = 1;
            this.y += param;
            if (this.y >= this.rows) {
                this.y = this.rows - 1;
            }
        },

        // CSI Ps C
        // Cursor Forward Ps Times (default = 1) (CUF).
        cursorForward : function(params) {
            var param = params[0];
            if (param < 1) param = 1;
            this.x += param;
            if (this.x >= this.cols) {
                this.x = this.cols - 1;
            }
        },

        // CSI Ps D
        // Cursor Backward Ps Times (default = 1) (CUB).
        cursorBackward : function(params) {
            var param = params[0];
            if (param < 1) param = 1;
            this.x -= param;
            if (this.x < 0) this.x = 0;
        },

        // CSI Ps ; Ps H
        // Cursor Position [row;column] (default = [1,1]) (CUP).
        cursorPos : function(params) {
            var row, col;

            row = params[0] - 1;

            if (params.length >= 2) {
                col = params[1] - 1;
            } else {
                col = 0;
            }

            if (row < 0) {
                row = 0;
            } else if (row >= this.rows) {
                row = this.rows - 1;
            }

            if (col < 0) {
                col = 0;
            } else if (col >= this.cols) {
                col = this.cols - 1;
            }

            this.x = col;
            this.y = row;
        },

        // CSI Ps J    Erase in Display (ED).
        //         Ps = 0    -> Erase Below (default).
        //         Ps = 1    -> Erase Above.
        //         Ps = 2    -> Erase All.
        //         Ps = 3    -> Erase Saved Lines (xterm).
        // CSI ? Ps J
        //     Erase in Display (DECSED).
        //         Ps = 0    -> Selective Erase Below (default).
        //         Ps = 1    -> Selective Erase Above.
        //         Ps = 2    -> Selective Erase All.
        eraseInDisplay : function(params) {
            var j;
            switch (params[0]) {
                case 0:
                    this.eraseRight(this.x, this.y);
                    j = this.y + 1;
                    for (; j < this.rows; j++) {
                        this.eraseLine(j);
                    }
                    break;
                case 1:
                    this.eraseLeft(this.x, this.y);
                    j = this.y;
                    while (j--) {
                        this.eraseLine(j);
                    }
                    break;
                case 2:
                    j = this.rows;
                    while (j--) this.eraseLine(j);
                    break;
                case 3:
                    ; // no saved lines
                    break;
            }
        },

        // CSI Ps K    Erase in Line (EL).
        //         Ps = 0    -> Erase to Right (default).
        //         Ps = 1    -> Erase to Left.
        //         Ps = 2    -> Erase All.
        // CSI ? Ps K
        //     Erase in Line (DECSEL).
        //         Ps = 0    -> Selective Erase to Right (default).
        //         Ps = 1    -> Selective Erase to Left.
        //         Ps = 2    -> Selective Erase All.
        eraseInLine : function(params) {
            switch (params[0]) {
                case 0:
                    this.eraseRight(this.x, this.y);
                    break;
                case 1:
                    this.eraseLeft(this.x, this.y);
                    break;
                case 2:
                    this.eraseLine(this.y);
                    break;
            }
        },

        // CSI Pm m    Character Attributes (SGR).
        //         Ps = 0    -> Normal (default).
        //         Ps = 1    -> Bold.
        //         Ps = 4    -> Underlined.
        //         Ps = 5    -> Blink (appears as Bold).
        //         Ps = 7    -> Inverse.
        //         Ps = 8    -> Invisible, i.e., hidden (VT300).
        //         Ps = 2 2    -> Normal (neither bold nor faint).
        //         Ps = 2 4    -> Not underlined.
        //         Ps = 2 5    -> Steady (not blinking).
        //         Ps = 2 7    -> Positive (not inverse).
        //         Ps = 2 8    -> Visible, i.e., not hidden (VT300).
        //         Ps = 3 0    -> Set foreground color to Black.
        //         Ps = 3 1    -> Set foreground color to Red.
        //         Ps = 3 2    -> Set foreground color to Green.
        //         Ps = 3 3    -> Set foreground color to Yellow.
        //         Ps = 3 4    -> Set foreground color to Blue.
        //         Ps = 3 5    -> Set foreground color to Magenta.
        //         Ps = 3 6    -> Set foreground color to Cyan.
        //         Ps = 3 7    -> Set foreground color to White.
        //         Ps = 3 9    -> Set foreground color to default (original).
        //         Ps = 4 0    -> Set background color to Black.
        //         Ps = 4 1    -> Set background color to Red.
        //         Ps = 4 2    -> Set background color to Green.
        //         Ps = 4 3    -> Set background color to Yellow.
        //         Ps = 4 4    -> Set background color to Blue.
        //         Ps = 4 5    -> Set background color to Magenta.
        //         Ps = 4 6    -> Set background color to Cyan.
        //         Ps = 4 7    -> Set background color to White.
        //         Ps = 4 9    -> Set background color to default (original).

        //     If 16-color support is compiled, the following apply.    Assume
        //     that xterm's resources are set so that the ISO color codes are
        //     the first 8 of a set of 16.    Then the aixterm colors are the
        //     bright versions of the ISO colors:
        //         Ps = 9 0    -> Set foreground color to Black.
        //         Ps = 9 1    -> Set foreground color to Red.
        //         Ps = 9 2    -> Set foreground color to Green.
        //         Ps = 9 3    -> Set foreground color to Yellow.
        //         Ps = 9 4    -> Set foreground color to Blue.
        //         Ps = 9 5    -> Set foreground color to Magenta.
        //         Ps = 9 6    -> Set foreground color to Cyan.
        //         Ps = 9 7    -> Set foreground color to White.
        //         Ps = 1 0 0    -> Set background color to Black.
        //         Ps = 1 0 1    -> Set background color to Red.
        //         Ps = 1 0 2    -> Set background color to Green.
        //         Ps = 1 0 3    -> Set background color to Yellow.
        //         Ps = 1 0 4    -> Set background color to Blue.
        //         Ps = 1 0 5    -> Set background color to Magenta.
        //         Ps = 1 0 6    -> Set background color to Cyan.
        //         Ps = 1 0 7    -> Set background color to White.

        //     If xterm is compiled with the 16-color support disabled, it
        //     supports the following, from rxvt:
        //         Ps = 1 0 0    -> Set foreground and background color to
        //         default.

        //     If 88- or 256-color support is compiled, the following apply.
        //         Ps = 3 8    ; 5    ; Ps -> Set foreground color to the second
        //         Ps.
        //         Ps = 4 8    ; 5    ; Ps -> Set background color to the second
        //         Ps.
        charAttributes : function(params) {
            // Optimize a single SGR0.
            if (params.length === 1 && params[0] === 0) {
                this.curAttr = this.defAttr;
                return;
            }

            var l = params.length
                , i = 0
                , flags = this.curAttr >> 18
                , fg = (this.curAttr >> 9) & 0x1ff
                , bg = this.curAttr & 0x1ff
                , p;

            for (; i < l; i++) {
                p = params[i];
                if (p >= 30 && p <= 37) {
                    // fg color 8
                    fg = p - 30;
                } else if (p >= 40 && p <= 47) {
                    // bg color 8
                    bg = p - 40;
                } else if (p >= 90 && p <= 97) {
                    // fg color 16
                    p += 8;
                    fg = p - 90;
                } else if (p >= 100 && p <= 107) {
                    // bg color 16
                    p += 8;
                    bg = p - 100;
                } else if (p === 0) {
                    // default
                    flags = this.defAttr >> 18;
                    fg = (this.defAttr >> 9) & 0x1ff;
                    bg = this.defAttr & 0x1ff;
                    // flags = 0;
                    // fg = 0x1ff;
                    // bg = 0x1ff;
                } else if (p === 1) {
                    // bold text
                    flags |= 1;
                } else if (p === 4) {
                    // underlined text
                    flags |= 2;
                } else if (p === 5) {
                    // blink
                    flags |= 4;
                } else if (p === 7) {
                    // inverse and positive
                    // test with: echo -e '\e[31m\e[42mhello\e[7mworld\e[27mhi\e[m'
                    flags |= 8;
                } else if (p === 8) {
                    // invisible
                    flags |= 16;
                } else if (p === 22) {
                    // not bold
                    flags &= ~1;
                } else if (p === 24) {
                    // not underlined
                    flags &= ~2;
                } else if (p === 25) {
                    // not blink
                    flags &= ~4;
                } else if (p === 27) {
                    // not inverse
                    flags &= ~8;
                } else if (p === 28) {
                    // not invisible
                    flags &= ~16;
                } else if (p === 39) {
                    // reset fg
                    fg = (this.defAttr >> 9) & 0x1ff;
                } else if (p === 49) {
                    // reset bg
                    bg = this.defAttr & 0x1ff;
                } else if (p === 38) {
                    // fg color 256
                    if (params[i + 1] === 2) {
                        i += 2;
                        fg = matchColor(
                            params[i] & 0xff,
                            params[i + 1] & 0xff,
                            params[i + 2] & 0xff);
                        if (fg === -1) fg = 0x1ff;
                        i += 2;
                    } else if (params[i + 1] === 5) {
                        i += 2;
                        p = params[i] & 0xff;
                        fg = p;
                    }
                } else if (p === 48) {
                    // bg color 256
                    if (params[i + 1] === 2) {
                        i += 2;
                        bg = matchColor(
                            params[i] & 0xff,
                            params[i + 1] & 0xff,
                            params[i + 2] & 0xff);
                        if (bg === -1) bg = 0x1ff;
                        i += 2;
                    } else if (params[i + 1] === 5) {
                        i += 2;
                        p = params[i] & 0xff;
                        bg = p;
                    }
                } else if (p === 100) {
                    // reset fg/bg
                    fg = (this.defAttr >> 9) & 0x1ff;
                    bg = this.defAttr & 0x1ff;
                } else {
                    this.error('Unknown SGR attribute: %d.', p);
                }
            }

            this.curAttr = (flags << 18) | (fg << 9) | bg;
        },

        // CSI Ps n    Device Status Report (DSR).
        //         Ps = 5    -> Status Report.    Result (``OK'') is
        //     CSI 0 n
        //         Ps = 6    -> Report Cursor Position (CPR) [row;column].
        //     Result is
        //     CSI r ; c R
        // CSI ? Ps n
        //     Device Status Report (DSR, DEC-specific).
        //         Ps = 6    -> Report Cursor Position (CPR) [row;column] as CSI
        //         ? r ; c R (assumes page is zero).
        //         Ps = 1 5    -> Report Printer status as CSI ? 1 0    n    (ready).
        //         or CSI ? 1 1    n    (not ready).
        //         Ps = 2 5    -> Report UDK status as CSI ? 2 0    n    (unlocked)
        //         or CSI ? 2 1    n    (locked).
        //         Ps = 2 6    -> Report Keyboard status as
        //     CSI ? 2 7    ;    1    ;    0    ;    0    n    (North American).
        //     The last two parameters apply to VT400 & up, and denote key-
        //     board ready and LK01 respectively.
        //         Ps = 5 3    -> Report Locator status as
        //     CSI ? 5 3    n    Locator available, if compiled-in, or
        //     CSI ? 5 0    n    No Locator, if not.
        deviceStatus : function(params) {
            if (!this.prefix) {
                switch (params[0]) {
                    case 5:
                        // status report
                        this.send('\x1b[0n');
                        break;
                    case 6:
                        // cursor position
                        this.send('\x1b['
                            + (this.y + 1)
                            + ';'
                            + (this.x + 1)
                            + 'R');
                        break;
                }
            } else if (this.prefix === '?') {
                // modern xterm doesnt seem to
                // respond to any of these except ?6, 6, and 5
                switch (params[0]) {
                    case 6:
                        // cursor position
                        this.send('\x1b[?'
                            + (this.y + 1)
                            + ';'
                            + (this.x + 1)
                            + 'R');
                        break;
                    case 15:
                        // no printer
                        // this.send('\x1b[?11n');
                        break;
                    case 25:
                        // dont support user defined keys
                        // this.send('\x1b[?21n');
                        break;
                    case 26:
                        // north american keyboard
                        // this.send('\x1b[?27;1;0;0n');
                        break;
                    case 53:
                        // no dec locator/mouse
                        // this.send('\x1b[?50n');
                        break;
                }
            }
        },

        /**
         * Additions
         */

        // CSI Ps @
        // Insert Ps (Blank) Character(s) (default = 1) (ICH).
        insertChars : function(params) {
            var param, row, j, ch;

            param = params[0];
            if (param < 1) param = 1;

            row = this.y + this.ybase;
            j = this.x;
            ch = [this.eraseAttr(), ' ']; // xterm

            while (param-- && j < this.cols) {
                this.lines[row].splice(j++, 0, ch);
                this.lines[row].pop();
            }
        },

        // CSI Ps E
        // Cursor Next Line Ps Times (default = 1) (CNL).
        // same as CSI Ps B ?
        cursorNextLine : function(params) {
            var param = params[0];
            if (param < 1) param = 1;
            this.y += param;
            if (this.y >= this.rows) {
                this.y = this.rows - 1;
            }
            this.x = 0;
        },

        // CSI Ps F
        // Cursor Preceding Line Ps Times (default = 1) (CNL).
        // reuse CSI Ps A ?
        cursorPrecedingLine : function(params) {
            var param = params[0];
            if (param < 1) param = 1;
            this.y -= param;
            if (this.y < 0) this.y = 0;
            this.x = 0;
        },

        // CSI Ps G
        // Cursor Character Absolute    [column] (default = [row,1]) (CHA).
        cursorCharAbsolute : function(params) {
            var param = params[0];
            if (param < 1) param = 1;
            this.x = param - 1;
        },

        // CSI Ps L
        // Insert Ps Line(s) (default = 1) (IL).
        insertLines : function(params) {
            var param, row, j;

            param = params[0];
            if (param < 1) param = 1;
            row = this.y + this.ybase;

            j = this.rows - 1 - this.scrollBottom;
            j = this.rows - 1 + this.ybase - j + 1;

            while (param--) {
                // test: echo -e '\e[44m\e[1L\e[0m'
                // blankLine(true) - xterm/linux behavior
                this.lines.splice(row, 0, this.blankLine(true));
                this.lines.splice(j, 1);
            }

            // this.maxRange();
            this.updateRange(this.y);
            this.updateRange(this.scrollBottom);
        },

        // CSI Ps M
        // Delete Ps Line(s) (default = 1) (DL).
        deleteLines : function(params) {
            var param, row, j;

            param = params[0];
            if (param < 1) param = 1;
            row = this.y + this.ybase;

            j = this.rows - 1 - this.scrollBottom;
            j = this.rows - 1 + this.ybase - j;

            while (param--) {
                // test: echo -e '\e[44m\e[1M\e[0m'
                // blankLine(true) - xterm/linux behavior
                this.lines.splice(j + 1, 0, this.blankLine(true));
                this.lines.splice(row, 1);
            }

            // this.maxRange();
            this.updateRange(this.y);
            this.updateRange(this.scrollBottom);
        },

        // CSI Ps P
        // Delete Ps Character(s) (default = 1) (DCH).
        deleteChars : function(params) {
            var param, row, ch;

            param = params[0];
            if (param < 1) param = 1;

            row = this.y + this.ybase;
            ch = [this.eraseAttr(), ' ']; // xterm

            while (param--) {
                this.lines[row].splice(this.x, 1);
                this.lines[row].push(ch);
            }
        },

        // CSI Ps X
        // Erase Ps Character(s) (default = 1) (ECH).
        eraseChars : function(params) {
            var param, row, j, ch;

            param = params[0];
            if (param < 1) param = 1;

            row = this.y + this.ybase;
            j = this.x;
            ch = [this.eraseAttr(), ' ']; // xterm

            while (param-- && j < this.cols) {
                this.lines[row][j++] = ch;
            }
        },

        // CSI Pm `    Character Position Absolute
        //     [column] (default = [row,1]) (HPA).
        charPosAbsolute : function(params) {
            var param = params[0];
            if (param < 1) param = 1;
            this.x = param - 1;
            if (this.x >= this.cols) {
                this.x = this.cols - 1;
            }
        },

        // 141 61 a * HPR -
        // Horizontal Position Relative
        // reuse CSI Ps C ?
        HPositionRelative : function(params) {
            var param = params[0];
            if (param < 1) param = 1;
            this.x += param;
            if (this.x >= this.cols) {
                this.x = this.cols - 1;
            }
        },

        // CSI Ps c    Send Device Attributes (Primary DA).
        //         Ps = 0    or omitted -> request attributes from terminal.    The
        //         response depends on the decTerminalID resource setting.
        //         -> CSI ? 1 ; 2 c    (``VT100 with Advanced Video Option'')
        //         -> CSI ? 1 ; 0 c    (``VT101 with No Options'')
        //         -> CSI ? 6 c    (``VT102'')
        //         -> CSI ? 6 0 ; 1 ; 2 ; 6 ; 8 ; 9 ; 1 5 ; c    (``VT220'')
        //     The VT100-style response parameters do not mean anything by
        //     themselves.    VT220 parameters do, telling the host what fea-
        //     tures the terminal supports:
        //         Ps = 1    -> 132-columns.
        //         Ps = 2    -> Printer.
        //         Ps = 6    -> Selective erase.
        //         Ps = 8    -> User-defined keys.
        //         Ps = 9    -> National replacement character sets.
        //         Ps = 1 5    -> Technical characters.
        //         Ps = 2 2    -> ANSI color, e.g., VT525.
        //         Ps = 2 9    -> ANSI text locator (i.e., DEC Locator mode).
        // CSI > Ps c
        //     Send Device Attributes (Secondary DA).
        //         Ps = 0    or omitted -> request the terminal's identification
        //         code.    The response depends on the decTerminalID resource set-
        //         ting.    It should apply only to VT220 and up, but xterm extends
        //         this to VT100.
        //         -> CSI    > Pp ; Pv ; Pc c
        //     where Pp denotes the terminal type
        //         Pp = 0    -> ``VT100''.
        //         Pp = 1    -> ``VT220''.
        //     and Pv is the firmware version (for xterm, this was originally
        //     the XFree86 patch number, starting with 95).    In a DEC termi-
        //     nal, Pc indicates the ROM cartridge registration number and is
        //     always zero.
        // More information:
        //     xterm/charproc.c - line 2012, for more information.
        //     vim responds with ^[[?0c or ^[[?1c after the terminal's response (?)
        sendDeviceAttributes : function(params) {
            if (params[0] > 0) return;

            if (!this.prefix) {
                if (this.is('xterm')
                        || this.is('rxvt-unicode')
                        || this.is('screen')) {
                    this.send('\x1b[?1;2c');
                } else if (this.is('linux')) {
                    this.send('\x1b[?6c');
                }
            } else if (this.prefix === '>') {
                // xterm and urxvt
                // seem to spit this
                // out around ~370 times (?).
                if (this.is('xterm')) {
                    this.send('\x1b[>0;276;0c');
                } else if (this.is('rxvt-unicode')) {
                    this.send('\x1b[>85;95;0c');
                } else if (this.is('linux')) {
                    // not supported by linux console.
                    // linux console echoes parameters.
                    this.send(params[0] + 'c');
                } else if (this.is('screen')) {
                    this.send('\x1b[>83;40003;0c');
                }
            }
        },

        // CSI Pm d
        // Line Position Absolute    [row] (default = [1,column]) (VPA).
        linePosAbsolute : function(params) {
            var param = params[0];
            if (param < 1) param = 1;
            this.y = param - 1;
            if (this.y >= this.rows) {
                this.y = this.rows - 1;
            }
        },

        // 145 65 e * VPR - Vertical Position Relative
        // reuse CSI Ps B ?
        VPositionRelative : function(params) {
            var param = params[0];
            if (param < 1) param = 1;
            this.y += param;
            if (this.y >= this.rows) {
                this.y = this.rows - 1;
            }
        },

        // CSI Ps ; Ps f
        //     Horizontal and Vertical Position [row;column] (default =
        //     [1,1]) (HVP).
        HVPosition : function(params) {
            if (params[0] < 1) params[0] = 1;
            if (params[1] < 1) params[1] = 1;

            this.y = params[0] - 1;
            if (this.y >= this.rows) {
                this.y = this.rows - 1;
            }

            this.x = params[1] - 1;
            if (this.x >= this.cols) {
                this.x = this.cols - 1;
            }
        },

        // CSI Pm h    Set Mode (SM).
        //         Ps = 2    -> Keyboard Action Mode (AM).
        //         Ps = 4    -> Insert Mode (IRM).
        //         Ps = 1 2    -> Send/receive (SRM).
        //         Ps = 2 0    -> Automatic Newline (LNM).
        // CSI ? Pm h
        //     DEC Private Mode Set (DECSET).
        //         Ps = 1    -> Application Cursor Keys (DECCKM).
        //         Ps = 2    -> Designate USASCII for character sets G0-G3
        //         (DECANM), and set VT100 mode.
        //         Ps = 3    -> 132 Column Mode (DECCOLM).
        //         Ps = 4    -> Smooth (Slow) Scroll (DECSCLM).
        //         Ps = 5    -> Reverse Video (DECSCNM).
        //         Ps = 6    -> Origin Mode (DECOM).
        //         Ps = 7    -> Wraparound Mode (DECAWM).
        //         Ps = 8    -> Auto-repeat Keys (DECARM).
        //         Ps = 9    -> Send Mouse X & Y on button press.    See the sec-
        //         tion Mouse Tracking.
        //         Ps = 1 0    -> Show toolbar (rxvt).
        //         Ps = 1 2    -> Start Blinking Cursor (att610).
        //         Ps = 1 8    -> Print form feed (DECPFF).
        //         Ps = 1 9    -> Set print extent to full screen (DECPEX).
        //         Ps = 2 5    -> Show Cursor (DECTCEM).
        //         Ps = 3 0    -> Show scrollbar (rxvt).
        //         Ps = 3 5    -> Enable font-shifting functions (rxvt).
        //         Ps = 3 8    -> Enter Tektronix Mode (DECTEK).
        //         Ps = 4 0    -> Allow 80 -> 132 Mode.
        //         Ps = 4 1    -> more(1) fix (see curses resource).
        //         Ps = 4 2    -> Enable Nation Replacement Character sets (DECN-
        //         RCM).
        //         Ps = 4 4    -> Turn On Margin Bell.
        //         Ps = 4 5    -> Reverse-wraparound Mode.
        //         Ps = 4 6    -> Start Logging.    This is normally disabled by a
        //         compile-time option.
        //         Ps = 4 7    -> Use Alternate Screen Buffer.    (This may be dis-
        //         abled by the titeInhibit resource).
        //         Ps = 6 6    -> Application keypad (DECNKM).
        //         Ps = 6 7    -> Backarrow key sends backspace (DECBKM).
        //         Ps = 1 0 0 0    -> Send Mouse X & Y on button press and
        //         release.    See the section Mouse Tracking.
        //         Ps = 1 0 0 1    -> Use Hilite Mouse Tracking.
        //         Ps = 1 0 0 2    -> Use Cell Motion Mouse Tracking.
        //         Ps = 1 0 0 3    -> Use All Motion Mouse Tracking.
        //         Ps = 1 0 0 4    -> Send FocusIn/FocusOut events.
        //         Ps = 1 0 0 5    -> Enable Extended Mouse Mode.
        //         Ps = 1 0 1 0    -> Scroll to bottom on tty output (rxvt).
        //         Ps = 1 0 1 1    -> Scroll to bottom on key press (rxvt).
        //         Ps = 1 0 3 4    -> Interpret "meta" key, sets eighth bit.
        //         (enables the eightBitInput resource).
        //         Ps = 1 0 3 5    -> Enable special modifiers for Alt and Num-
        //         Lock keys.    (This enables the numLock resource).
        //         Ps = 1 0 3 6    -> Send ESC     when Meta modifies a key.    (This
        //         enables the metaSendsEscape resource).
        //         Ps = 1 0 3 7    -> Send DEL from the editing-keypad Delete
        //         key.
        //         Ps = 1 0 3 9    -> Send ESC    when Alt modifies a key.    (This
        //         enables the altSendsEscape resource).
        //         Ps = 1 0 4 0    -> Keep selection even if not highlighted.
        //         (This enables the keepSelection resource).
        //         Ps = 1 0 4 1    -> Use the CLIPBOARD selection.    (This enables
        //         the selectToClipboard resource).
        //         Ps = 1 0 4 2    -> Enable Urgency window manager hint when
        //         Control-G is received.    (This enables the bellIsUrgent
        //         resource).
        //         Ps = 1 0 4 3    -> Enable raising of the window when Control-G
        //         is received.    (enables the popOnBell resource).
        //         Ps = 1 0 4 7    -> Use Alternate Screen Buffer.    (This may be
        //         disabled by the titeInhibit resource).
        //         Ps = 1 0 4 8    -> Save cursor as in DECSC.    (This may be dis-
        //         abled by the titeInhibit resource).
        //         Ps = 1 0 4 9    -> Save cursor as in DECSC and use Alternate
        //         Screen Buffer, clearing it first.    (This may be disabled by
        //         the titeInhibit resource).    This combines the effects of the 1
        //         0 4 7    and 1 0 4 8    modes.    Use this with terminfo-based
        //         applications rather than the 4 7    mode.
        //         Ps = 1 0 5 0    -> Set terminfo/termcap function-key mode.
        //         Ps = 1 0 5 1    -> Set Sun function-key mode.
        //         Ps = 1 0 5 2    -> Set HP function-key mode.
        //         Ps = 1 0 5 3    -> Set SCO function-key mode.
        //         Ps = 1 0 6 0    -> Set legacy keyboard emulation (X11R6).
        //         Ps = 1 0 6 1    -> Set VT220 keyboard emulation.
        //         Ps = 2 0 0 4    -> Set bracketed paste mode.
        // Modes:
        //     http://vt100.net/docs/vt220-rm/chapter4.html
        setMode : function(params) {
            if (typeof params === 'object') {
                var l = params.length
                    , i = 0;

                for (; i < l; i++) {
                    this.setMode(params[i]);
                }

                return;
            }

            if (!this.prefix) {
                switch (params) {
                    case 4:
                        this.insertMode = true;
                        break;
                    case 20:
                        //this.convertEol = true;
                        break;
                }
            } else if (this.prefix === '?') {
                switch (params) {
                    case 1:
                        this.applicationCursor = true;
                        break;
                    case 2:
                        this.setgCharset(0, this.charsets.US);
                        this.setgCharset(1, this.charsets.US);
                        this.setgCharset(2, this.charsets.US);
                        this.setgCharset(3, this.charsets.US);
                        // set VT100 mode here
                        break;
                    case 3: // 132 col mode
                        this.savedCols = this.cols;
                        this.resize(132, this.rows);
                        break;
                    case 6:
                        this.originMode = true;
                        break;
                    case 7:
                        this.wraparoundMode = true;
                        break;
                    case 12:
                        // this.cursorBlink = true;
                        break;
                    case 66:
                        this.log('Serial port requested application keypad.');
                        this.applicationKeypad = true;
                        break;
                    case 9: // X10 Mouse
                        // no release, no motion, no wheel, no modifiers.
                    case 1000: // vt200 mouse
                        // no motion.
                        // no modifiers, except control on the wheel.
                    case 1002: // button event mouse
                    case 1003: // any event mouse
                        // any event - sends motion events,
                        // even if there is no button held down.
                        this.x10Mouse = params === 9;
                        this.vt200Mouse = params === 1000;
                        this.normalMouse = params > 1000;
                        this.mouseEvents = true;
                        this.el.style.cursor = 'default';
                        this.log('Binding to mouse events.');
                        break;
                    case 1004: // send focusin/focusout events
                        // focusin: ^[[I
                        // focusout: ^[[O
                        this.sendFocus = true;
                        break;
                    case 1005: // utf8 ext mode mouse
                        this.utfMouse = true;
                        // for wide terminals
                        // simply encodes large values as utf8 characters
                        break;
                    case 1006: // sgr ext mode mouse
                        this.sgrMouse = true;
                        // for wide terminals
                        // does not add 32 to fields
                        // press: ^[[<b;x;yM
                        // release: ^[[<b;x;ym
                        break;
                    case 1015: // urxvt ext mode mouse
                        this.urxvtMouse = true;
                        // for wide terminals
                        // numbers for fields
                        // press: ^[[b;x;yM
                        // motion: ^[[b;x;yT
                        break;
                    case 25: // show cursor
                        this.cursorHidden = false;
                        break;
                    case 1049: // alt screen buffer cursor
                        //this.saveCursor();
                        ; // FALL-THROUGH
                    case 47: // alt screen buffer
                    case 1047: // alt screen buffer
                        if (!this.normal) {
                            var normal = {
                                lines: this.lines,
                                ybase: this.ybase,
                                ydisp: this.ydisp,
                                x: this.x,
                                y: this.y,
                                scrollTop: this.scrollTop,
                                scrollBottom: this.scrollBottom,
                                tabs: this.tabs
                                // XXX save charset(s) here?
                                // charset: this.charset,
                                // glevel: this.glevel,
                                // charsets: this.charsets
                            };
                            this.reset();
                            this.normal = normal;
                            this.showCursor();
                        }
                        break;
                }
            }
        },

        // CSI Pm l    Reset Mode (RM).
        //         Ps = 2    -> Keyboard Action Mode (AM).
        //         Ps = 4    -> Replace Mode (IRM).
        //         Ps = 1 2    -> Send/receive (SRM).
        //         Ps = 2 0    -> Normal Linefeed (LNM).
        // CSI ? Pm l
        //     DEC Private Mode Reset (DECRST).
        //         Ps = 1    -> Normal Cursor Keys (DECCKM).
        //         Ps = 2    -> Designate VT52 mode (DECANM).
        //         Ps = 3    -> 80 Column Mode (DECCOLM).
        //         Ps = 4    -> Jump (Fast) Scroll (DECSCLM).
        //         Ps = 5    -> Normal Video (DECSCNM).
        //         Ps = 6    -> Normal Cursor Mode (DECOM).
        //         Ps = 7    -> No Wraparound Mode (DECAWM).
        //         Ps = 8    -> No Auto-repeat Keys (DECARM).
        //         Ps = 9    -> Don't send Mouse X & Y on button press.
        //         Ps = 1 0    -> Hide toolbar (rxvt).
        //         Ps = 1 2    -> Stop Blinking Cursor (att610).
        //         Ps = 1 8    -> Don't print form feed (DECPFF).
        //         Ps = 1 9    -> Limit print to scrolling region (DECPEX).
        //         Ps = 2 5    -> Hide Cursor (DECTCEM).
        //         Ps = 3 0    -> Don't show scrollbar (rxvt).
        //         Ps = 3 5    -> Disable font-shifting functions (rxvt).
        //         Ps = 4 0    -> Disallow 80 -> 132 Mode.
        //         Ps = 4 1    -> No more(1) fix (see curses resource).
        //         Ps = 4 2    -> Disable Nation Replacement Character sets (DEC-
        //         NRCM).
        //         Ps = 4 4    -> Turn Off Margin Bell.
        //         Ps = 4 5    -> No Reverse-wraparound Mode.
        //         Ps = 4 6    -> Stop Logging.    (This is normally disabled by a
        //         compile-time option).
        //         Ps = 4 7    -> Use Normal Screen Buffer.
        //         Ps = 6 6    -> Numeric keypad (DECNKM).
        //         Ps = 6 7    -> Backarrow key sends delete (DECBKM).
        //         Ps = 1 0 0 0    -> Don't send Mouse X & Y on button press and
        //         release.    See the section Mouse Tracking.
        //         Ps = 1 0 0 1    -> Don't use Hilite Mouse Tracking.
        //         Ps = 1 0 0 2    -> Don't use Cell Motion Mouse Tracking.
        //         Ps = 1 0 0 3    -> Don't use All Motion Mouse Tracking.
        //         Ps = 1 0 0 4    -> Don't send FocusIn/FocusOut events.
        //         Ps = 1 0 0 5    -> Disable Extended Mouse Mode.
        //         Ps = 1 0 1 0    -> Don't scroll to bottom on tty output
        //         (rxvt).
        //         Ps = 1 0 1 1    -> Don't scroll to bottom on key press (rxvt).
        //         Ps = 1 0 3 4    -> Don't interpret "meta" key.    (This disables
        //         the eightBitInput resource).
        //         Ps = 1 0 3 5    -> Disable special modifiers for Alt and Num-
        //         Lock keys.    (This disables the numLock resource).
        //         Ps = 1 0 3 6    -> Don't send ESC    when Meta modifies a key.
        //         (This disables the metaSendsEscape resource).
        //         Ps = 1 0 3 7    -> Send VT220 Remove from the editing-keypad
        //         Delete key.
        //         Ps = 1 0 3 9    -> Don't send ESC    when Alt modifies a key.
        //         (This disables the altSendsEscape resource).
        //         Ps = 1 0 4 0    -> Do not keep selection when not highlighted.
        //         (This disables the keepSelection resource).
        //         Ps = 1 0 4 1    -> Use the PRIMARY selection.    (This disables
        //         the selectToClipboard resource).
        //         Ps = 1 0 4 2    -> Disable Urgency window manager hint when
        //         Control-G is received.    (This disables the bellIsUrgent
        //         resource).
        //         Ps = 1 0 4 3    -> Disable raising of the window when Control-
        //         G is received.    (This disables the popOnBell resource).
        //         Ps = 1 0 4 7    -> Use Normal Screen Buffer, clearing screen
        //         first if in the Alternate Screen.    (This may be disabled by
        //         the titeInhibit resource).
        //         Ps = 1 0 4 8    -> Restore cursor as in DECRC.    (This may be
        //         disabled by the titeInhibit resource).
        //         Ps = 1 0 4 9    -> Use Normal Screen Buffer and restore cursor
        //         as in DECRC.    (This may be disabled by the titeInhibit
        //         resource).    This combines the effects of the 1 0 4 7    and 1 0
        //         4 8    modes.    Use this with terminfo-based applications rather
        //         than the 4 7    mode.
        //         Ps = 1 0 5 0    -> Reset terminfo/termcap function-key mode.
        //         Ps = 1 0 5 1    -> Reset Sun function-key mode.
        //         Ps = 1 0 5 2    -> Reset HP function-key mode.
        //         Ps = 1 0 5 3    -> Reset SCO function-key mode.
        //         Ps = 1 0 6 0    -> Reset legacy keyboard emulation (X11R6).
        //         Ps = 1 0 6 1    -> Reset keyboard emulation to Sun/PC style.
        //         Ps = 2 0 0 4    -> Reset bracketed paste mode.
        resetMode : function(params) {
            if (typeof params === 'object') {
                var l = params.length
                    , i = 0;

                for (; i < l; i++) {
                    this.resetMode(params[i]);
                }

                return;
            }

            if (!this.prefix) {
                switch (params) {
                    case 4:
                        this.insertMode = false;
                        break;
                    case 20:
                        //this.convertEol = false;
                        break;
                }
            } else if (this.prefix === '?') {
                switch (params) {
                    case 1:
                        this.applicationCursor = false;
                        break;
                    case 3:
                        if (this.cols === 132 && this.savedCols) {
                            this.resize(this.savedCols, this.rows);
                        }
                        delete this.savedCols;
                        break;
                    case 6:
                        this.originMode = false;
                        break;
                    case 7:
                        this.wraparoundMode = false;
                        break;
                    case 12:
                        // this.cursorBlink = false;
                        break;
                    case 66:
                        this.log('Switching back to normal keypad.');
                        this.applicationKeypad = false;
                        break;
                    case 9: // X10 Mouse
                    case 1000: // vt200 mouse
                    case 1002: // button event mouse
                    case 1003: // any event mouse
                        this.x10Mouse = false;
                        this.vt200Mouse = false;
                        this.normalMouse = false;
                        this.mouseEvents = false;
                        this.el.style.cursor = '';
                        break;
                    case 1004: // send focusin/focusout events
                        this.sendFocus = false;
                        break;
                    case 1005: // utf8 ext mode mouse
                        this.utfMouse = false;
                        break;
                    case 1006: // sgr ext mode mouse
                        this.sgrMouse = false;
                        break;
                    case 1015: // urxvt ext mode mouse
                        this.urxvtMouse = false;
                        break;
                    case 25: // hide cursor
                        this.cursorHidden = true;
                        break;
                    case 1049: // alt screen buffer cursor
                        ; // FALL-THROUGH
                    case 47: // normal screen buffer
                    case 1047: // normal screen buffer - clearing it first
                        if (this.normal) {
                            this.lines = this.normal.lines;
                            this.ybase = this.normal.ybase;
                            this.ydisp = this.normal.ydisp;
                            this.x = this.normal.x;
                            this.y = this.normal.y;
                            this.scrollTop = this.normal.scrollTop;
                            this.scrollBottom = this.normal.scrollBottom;
                            this.tabs = this.normal.tabs;
                            this.normal = null;
                            // if (params === 1049) {
                            //     this.x = this.savedX;
                            //     this.y = this.savedY;
                            // }
                            this.refresh(0, this.rows - 1);
                            this.showCursor();
                        }
                        break;
                }
            }
        },

        // CSI Ps ; Ps r
        //     Set Scrolling Region [top;bottom] (default = full size of win-
        //     dow) (DECSTBM).
        // CSI ? Pm r
        setScrollRegion : function(params) {
            if (this.prefix) return;
            this.scrollTop = (params[0] || 1) - 1;
            this.scrollBottom = (params[1] || this.rows) - 1;
            this.x = 0;
            this.y = 0;
        },

        // CSI s
        //     Save cursor (ANSI.SYS).
        saveCursor : function(params) {
            this.savedX = this.x;
            this.savedY = this.y;
        },

        // CSI u
        //     Restore cursor (ANSI.SYS).
        restoreCursor : function(params) {
            this.x = this.savedX || 0;
            this.y = this.savedY || 0;
        },

        /**
         * Lesser Used
         */

        // CSI Ps I
        //     Cursor Forward Tabulation Ps tab stops (default = 1) (CHT).
        cursorForwardTab : function(params) {
            var param = params[0] || 1;
            while (param--) {
                this.x = this.nextStop();
            }
        },

        // CSI Ps S    Scroll up Ps lines (default = 1) (SU).
        scrollUp : function(params) {
            var param = params[0] || 1;
            while (param--) {
                this.lines.splice(this.ybase + this.scrollTop, 1);
                this.lines.splice(this.ybase + this.scrollBottom, 0, this.blankLine());
            }
            // this.maxRange();
            this.updateRange(this.scrollTop);
            this.updateRange(this.scrollBottom);
        },

        // CSI Ps T    Scroll down Ps lines (default = 1) (SD).
        scrollDown : function(params) {
            var param = params[0] || 1;
            while (param--) {
                this.lines.splice(this.ybase + this.scrollBottom, 1);
                this.lines.splice(this.ybase + this.scrollTop, 0, this.blankLine());
            }
            // this.maxRange();
            this.updateRange(this.scrollTop);
            this.updateRange(this.scrollBottom);
        },

        // CSI Ps ; Ps ; Ps ; Ps ; Ps T
        //     Initiate highlight mouse tracking.    Parameters are
        //     [func;startx;starty;firstrow;lastrow].    See the section Mouse
        //     Tracking.
        initMouseTracking : function(params) {
            // Relevant: DECSET 1001
        },

        // CSI > Ps; Ps T
        //     Reset one or more features of the title modes to the default
        //     value.    Normally, "reset" disables the feature.    It is possi-
        //     ble to disable the ability to reset features by compiling a
        //     different default for the title modes into xterm.
        //         Ps = 0    -> Do not set window/icon labels using hexadecimal.
        //         Ps = 1    -> Do not query window/icon labels using hexadeci-
        //         mal.
        //         Ps = 2    -> Do not set window/icon labels using UTF-8.
        //         Ps = 3    -> Do not query window/icon labels using UTF-8.
        //     (See discussion of "Title Modes").
        resetTitleModes : function(params) {
            ;
        },

        // CSI Ps Z    Cursor Backward Tabulation Ps tab stops (default = 1) (CBT).
        cursorBackwardTab : function(params) {
            var param = params[0] || 1;
            while (param--) {
                this.x = this.prevStop();
            }
        },

        // CSI Ps b    Repeat the preceding graphic character Ps times (REP).
        repeatPrecedingCharacter : function(params) {
            var param = params[0] || 1
                , line = this.lines[this.ybase + this.y]
                , ch = line[this.x - 1] || [this.defAttr, ' '];

            while (param--) line[this.x++] = ch;
        },

        // CSI Ps g    Tab Clear (TBC).
        //         Ps = 0    -> Clear Current Column (default).
        //         Ps = 3    -> Clear All.
        // Potentially:
        //     Ps = 2    -> Clear Stops on Line.
        //     http://vt100.net/annarbor/aaa-ug/section6.html
        tabClear : function(params) {
            var param = params[0];
            if (param <= 0) {
                delete this.tabs[this.x];
            } else if (param === 3) {
                this.tabs = {};
            }
        },

        // CSI Pm i    Media Copy (MC).
        //         Ps = 0    -> Print screen (default).
        //         Ps = 4    -> Turn off printer controller mode.
        //         Ps = 5    -> Turn on printer controller mode.
        // CSI ? Pm i
        //     Media Copy (MC, DEC-specific).
        //         Ps = 1    -> Print line containing cursor.
        //         Ps = 4    -> Turn off autoprint mode.
        //         Ps = 5    -> Turn on autoprint mode.
        //         Ps = 1    0    -> Print composed display, ignores DECPEX.
        //         Ps = 1    1    -> Print all pages.
        mediaCopy : function(params) {
            ;
        },

        // CSI > Ps; Ps m
        //     Set or reset resource-values used by xterm to decide whether
        //     to construct escape sequences holding information about the
        //     modifiers pressed with a given key.    The first parameter iden-
        //     tifies the resource to set/reset.    The second parameter is the
        //     value to assign to the resource.    If the second parameter is
        //     omitted, the resource is reset to its initial value.
        //         Ps = 1    -> modifyCursorKeys.
        //         Ps = 2    -> modifyFunctionKeys.
        //         Ps = 4    -> modifyOtherKeys.
        //     If no parameters are given, all resources are reset to their
        //     initial values.
        setResources : function(params) {
            ;
        },

        // CSI > Ps n
        //     Disable modifiers which may be enabled via the CSI > Ps; Ps m
        //     sequence.    This corresponds to a resource value of "-1", which
        //     cannot be set with the other sequence.    The parameter identi-
        //     fies the resource to be disabled:
        //         Ps = 1    -> modifyCursorKeys.
        //         Ps = 2    -> modifyFunctionKeys.
        //         Ps = 4    -> modifyOtherKeys.
        //     If the parameter is omitted, modifyFunctionKeys is disabled.
        //     When modifyFunctionKeys is disabled, xterm uses the modifier
        //     keys to make an extended sequence of functions rather than
        //     adding a parameter to each function key to denote the modi-
        //     fiers.
        disableModifiers : function(params) {
            ;
        },

        // CSI > Ps p
        //     Set resource value pointerMode.    This is used by xterm to
        //     decide whether to hide the pointer cursor as the user types.
        //     Valid values for the parameter:
        //         Ps = 0    -> never hide the pointer.
        //         Ps = 1    -> hide if the mouse tracking mode is not enabled.
        //         Ps = 2    -> always hide the pointer.    If no parameter is
        //         given, xterm uses the default, which is 1 .
        setPointerMode : function(params) {
            ;
        },

        // CSI ! p     Soft terminal reset (DECSTR).
        // http://vt100.net/docs/vt220-rm/table4-10.html
        softReset : function(params) {
            this.cursorHidden = false;
            this.insertMode = false;
            this.originMode = false;
            this.wraparoundMode = false; // autowrap
            this.applicationKeypad = false; // ?
            this.applicationCursor = false;
            this.scrollTop = 0;
            this.scrollBottom = this.rows - 1;
            this.curAttr = this.defAttr;
            this.x = this.y = 0; // ?
            this.charset = null;
            this.glevel = 0; // ??
            this.charsets = [null]; // ??
        },

        // CSI Ps$ p
        //     Request ANSI mode (DECRQM).    For VT300 and up, reply is
        //         CSI Ps; Pm$ y
        //     where Ps is the mode number as in RM, and Pm is the mode
        //     value:
        //         0 - not recognized
        //         1 - set
        //         2 - reset
        //         3 - permanently set
        //         4 - permanently reset
        requestAnsiMode : function(params) {
            ;
        },

        // CSI ? Ps$ p
        //     Request DEC private mode (DECRQM).    For VT300 and up, reply is
        //         CSI ? Ps; Pm$ p
        //     where Ps is the mode number as in DECSET, Pm is the mode value
        //     as in the ANSI DECRQM.
        requestPrivateMode : function(params) {
            ;
        },

        // CSI Ps ; Ps " p
        //     Set conformance level (DECSCL).    Valid values for the first
        //     parameter:
        //         Ps = 6 1    -> VT100.
        //         Ps = 6 2    -> VT200.
        //         Ps = 6 3    -> VT300.
        //     Valid values for the second parameter:
        //         Ps = 0    -> 8-bit controls.
        //         Ps = 1    -> 7-bit controls (always set for VT100).
        //         Ps = 2    -> 8-bit controls.
        setConformanceLevel : function(params) {
            ;
        },

        // CSI Ps q    Load LEDs (DECLL).
        //         Ps = 0    -> Clear all LEDS (default).
        //         Ps = 1    -> Light Num Lock.
        //         Ps = 2    -> Light Caps Lock.
        //         Ps = 3    -> Light Scroll Lock.
        //         Ps = 2    1    -> Extinguish Num Lock.
        //         Ps = 2    2    -> Extinguish Caps Lock.
        //         Ps = 2    3    -> Extinguish Scroll Lock.
        loadLEDs : function(params) {
            ;
        },

        // CSI Ps SP q
        //     Set cursor style (DECSCUSR, VT520).
        //         Ps = 0    -> blinking block.
        //         Ps = 1    -> blinking block (default).
        //         Ps = 2    -> steady block.
        //         Ps = 3    -> blinking underline.
        //         Ps = 4    -> steady underline.
        setCursorStyle : function(params) {
            ;
        },

        // CSI Ps " q
        //     Select character protection attribute (DECSCA).    Valid values
        //     for the parameter:
        //         Ps = 0    -> DECSED and DECSEL can erase (default).
        //         Ps = 1    -> DECSED and DECSEL cannot erase.
        //         Ps = 2    -> DECSED and DECSEL can erase.
        setCharProtectionAttr : function(params) {
            ;
        },

        // CSI ? Pm r
        //     Restore DEC Private Mode Values.    The value of Ps previously
        //     saved is restored.    Ps values are the same as for DECSET.
        restorePrivateValues : function(params) {
            ;
        },

        // CSI Pt; Pl; Pb; Pr; Ps$ r
        //     Change Attributes in Rectangular Area (DECCARA), VT400 and up.
        //         Pt; Pl; Pb; Pr denotes the rectangle.
        //         Ps denotes the SGR attributes to change: 0, 1, 4, 5, 7.
        // NOTE: xterm doesn't enable this code by default.
        setAttrInRectangle : function(params) {
            var t = params[0]
                , l = params[1]
                , b = params[2]
                , r = params[3]
                , attr = params[4];

            var line
                , i;

            for (; t < b + 1; t++) {
                line = this.lines[this.ybase + t];
                for (i = l; i < r; i++) {
                    line[i] = [attr, line[i][1]];
                }
            }

            // this.maxRange();
            this.updateRange(params[0]);
            this.updateRange(params[2]);
        },

        // CSI ? Pm s
        //     Save DEC Private Mode Values.    Ps values are the same as for
        //     DECSET.
        savePrivateValues : function(params) {
            ;
        },

        // CSI Ps ; Ps ; Ps t
        //     Window manipulation (from dtterm, as well as extensions).
        //     These controls may be disabled using the allowWindowOps
        //     resource.    Valid values for the first (and any additional
        //     parameters) are:
        //         Ps = 1    -> De-iconify window.
        //         Ps = 2    -> Iconify window.
        //         Ps = 3    ;    x ;    y -> Move window to [x, y].
        //         Ps = 4    ;    height ;    width -> Resize the xterm window to
        //         height and width in pixels.
        //         Ps = 5    -> Raise the xterm window to the front of the stack-
        //         ing order.
        //         Ps = 6    -> Lower the xterm window to the bottom of the
        //         stacking order.
        //         Ps = 7    -> Refresh the xterm window.
        //         Ps = 8    ;    height ;    width -> Resize the text area to
        //         [height;width] in characters.
        //         Ps = 9    ;    0    -> Restore maximized window.
        //         Ps = 9    ;    1    -> Maximize window (i.e., resize to screen
        //         size).
        //         Ps = 1 0    ;    0    -> Undo full-screen mode.
        //         Ps = 1 0    ;    1    -> Change to full-screen.
        //         Ps = 1 1    -> Report xterm window state.    If the xterm window
        //         is open (non-iconified), it returns CSI 1 t .    If the xterm
        //         window is iconified, it returns CSI 2 t .
        //         Ps = 1 3    -> Report xterm window position.    Result is CSI 3
        //         ; x ; y t
        //         Ps = 1 4    -> Report xterm window in pixels.    Result is CSI
        //         4    ;    height ;    width t
        //         Ps = 1 8    -> Report the size of the text area in characters.
        //         Result is CSI    8    ;    height ;    width t
        //         Ps = 1 9    -> Report the size of the screen in characters.
        //         Result is CSI    9    ;    height ;    width t
        //         Ps = 2 0    -> Report xterm window's icon label.    Result is
        //         OSC    L    label ST
        //         Ps = 2 1    -> Report xterm window's title.    Result is OSC    l
        //         label ST
        //         Ps = 2 2    ;    0    -> Save xterm icon and window title on
        //         stack.
        //         Ps = 2 2    ;    1    -> Save xterm icon title on stack.
        //         Ps = 2 2    ;    2    -> Save xterm window title on stack.
        //         Ps = 2 3    ;    0    -> Restore xterm icon and window title from
        //         stack.
        //         Ps = 2 3    ;    1    -> Restore xterm icon title from stack.
        //         Ps = 2 3    ;    2    -> Restore xterm window title from stack.
        //         Ps >= 2 4    -> Resize to Ps lines (DECSLPP).
        manipulateWindow : function(params) {
            ;
        },

        // CSI Pt; Pl; Pb; Pr; Ps$ t
        //     Reverse Attributes in Rectangular Area (DECRARA), VT400 and
        //     up.
        //         Pt; Pl; Pb; Pr denotes the rectangle.
        //         Ps denotes the attributes to reverse, i.e.,    1, 4, 5, 7.
        // NOTE: xterm doesn't enable this code by default.
        reverseAttrInRectangle : function(params) {
            ;
        },

        // CSI > Ps; Ps t
        //     Set one or more features of the title modes.    Each parameter
        //     enables a single feature.
        //         Ps = 0    -> Set window/icon labels using hexadecimal.
        //         Ps = 1    -> Query window/icon labels using hexadecimal.
        //         Ps = 2    -> Set window/icon labels using UTF-8.
        //         Ps = 3    -> Query window/icon labels using UTF-8.    (See dis-
        //         cussion of "Title Modes")
        setTitleModeFeature : function(params) {
            ;
        },

        // CSI Ps SP t
        //     Set warning-bell volume (DECSWBV, VT520).
        //         Ps = 0    or 1    -> off.
        //         Ps = 2 , 3    or 4    -> low.
        //         Ps = 5 , 6 , 7 , or 8    -> high.
        setWarningBellVolume : function(params) {
            ;
        },

        // CSI Ps SP u
        //     Set margin-bell volume (DECSMBV, VT520).
        //         Ps = 1    -> off.
        //         Ps = 2 , 3    or 4    -> low.
        //         Ps = 0 , 5 , 6 , 7 , or 8    -> high.
        setMarginBellVolume : function(params) {
            ;
        },

        // CSI Pt; Pl; Pb; Pr; Pp; Pt; Pl; Pp$ v
        //     Copy Rectangular Area (DECCRA, VT400 and up).
        //         Pt; Pl; Pb; Pr denotes the rectangle.
        //         Pp denotes the source page.
        //         Pt; Pl denotes the target location.
        //         Pp denotes the target page.
        // NOTE: xterm doesn't enable this code by default.
        copyRectangle : function(params) {
            ;
        },

        // CSI Pt ; Pl ; Pb ; Pr ' w
        //     Enable Filter Rectangle (DECEFR), VT420 and up.
        //     Parameters are [top;left;bottom;right].
        //     Defines the coordinates of a filter rectangle and activates
        //     it.    Anytime the locator is detected outside of the filter
        //     rectangle, an outside rectangle event is generated and the
        //     rectangle is disabled.    Filter rectangles are always treated
        //     as "one-shot" events.    Any parameters that are omitted default
        //     to the current locator position.    If all parameters are omit-
        //     ted, any locator motion will be reported.    DECELR always can-
        //     cels any prevous rectangle definition.
        enableFilterRectangle : function(params) {
            ;
        },

        // CSI Ps x    Request Terminal Parameters (DECREQTPARM).
        //     if Ps is a "0" (default) or "1", and xterm is emulating VT100,
        //     the control sequence elicits a response of the same form whose
        //     parameters describe the terminal:
        //         Ps -> the given Ps incremented by 2.
        //         Pn = 1    <- no parity.
        //         Pn = 1    <- eight bits.
        //         Pn = 1    <- 2    8    transmit 38.4k baud.
        //         Pn = 1    <- 2    8    receive 38.4k baud.
        //         Pn = 1    <- clock multiplier.
        //         Pn = 0    <- STP flags.
        requestParameters : function(params) {
            ;
        },

        // CSI Ps x    Select Attribute Change Extent (DECSACE).
        //         Ps = 0    -> from start to end position, wrapped.
        //         Ps = 1    -> from start to end position, wrapped.
        //         Ps = 2    -> rectangle (exact).
        selectChangeExtent : function(params) {
            ;
        },

        // CSI Pc; Pt; Pl; Pb; Pr$ x
        //     Fill Rectangular Area (DECFRA), VT420 and up.
        //         Pc is the character to use.
        //         Pt; Pl; Pb; Pr denotes the rectangle.
        // NOTE: xterm doesn't enable this code by default.
        fillRectangle : function(params) {
            var ch = params[0]
                , t = params[1]
                , l = params[2]
                , b = params[3]
                , r = params[4];

            var line
                , i;

            for (; t < b + 1; t++) {
                line = this.lines[this.ybase + t];
                for (i = l; i < r; i++) {
                    line[i] = [line[i][0], String.fromCharCode(ch)];
                }
            }

            // this.maxRange();
            this.updateRange(params[1]);
            this.updateRange(params[3]);
        },

        // CSI Ps ; Pu ' z
        //     Enable Locator Reporting (DECELR).
        //     Valid values for the first parameter:
        //         Ps = 0    -> Locator disabled (default).
        //         Ps = 1    -> Locator enabled.
        //         Ps = 2    -> Locator enabled for one report, then disabled.
        //     The second parameter specifies the coordinate unit for locator
        //     reports.
        //     Valid values for the second parameter:
        //         Pu = 0    <- or omitted -> default to character cells.
        //         Pu = 1    <- device physical pixels.
        //         Pu = 2    <- character cells.
        enableLocatorReporting : function(params) {
            var val = params[0] > 0;
            //this.mouseEvents = val;
            //this.decLocator = val;
        },

        // CSI Pt; Pl; Pb; Pr$ z
        //     Erase Rectangular Area (DECERA), VT400 and up.
        //         Pt; Pl; Pb; Pr denotes the rectangle.
        // NOTE: xterm doesn't enable this code by default.
        eraseRectangle : function(params) {
            var t = params[0]
                , l = params[1]
                , b = params[2]
                , r = params[3];

            var line
                , i
                , ch;

            ch = [this.eraseAttr(), ' ']; // xterm?

            for (; t < b + 1; t++) {
                line = this.lines[this.ybase + t];
                for (i = l; i < r; i++) {
                    line[i] = ch;
                }
            }

            // this.maxRange();
            this.updateRange(params[0]);
            this.updateRange(params[2]);
        },

        // CSI Pm ' {
        //     Select Locator Events (DECSLE).
        //     Valid values for the first (and any additional parameters)
        //     are:
        //         Ps = 0    -> only respond to explicit host requests (DECRQLP).
        //                                (This is default).    It also cancels any filter
        //     rectangle.
        //         Ps = 1    -> report button down transitions.
        //         Ps = 2    -> do not report button down transitions.
        //         Ps = 3    -> report button up transitions.
        //         Ps = 4    -> do not report button up transitions.
        setLocatorEvents : function(params) {
            ;
        },

        // CSI Pt; Pl; Pb; Pr$ {
        //     Selective Erase Rectangular Area (DECSERA), VT400 and up.
        //         Pt; Pl; Pb; Pr denotes the rectangle.
        selectiveEraseRectangle : function(params) {
            ;
        },

        // CSI Ps ' |
        //     Request Locator Position (DECRQLP).
        //     Valid values for the parameter are:
        //         Ps = 0 , 1 or omitted -> transmit a single DECLRP locator
        //         report.

        //     If Locator Reporting has been enabled by a DECELR, xterm will
        //     respond with a DECLRP Locator Report.    This report is also
        //     generated on button up and down events if they have been
        //     enabled with a DECSLE, or when the locator is detected outside
        //     of a filter rectangle, if filter rectangles have been enabled
        //     with a DECEFR.

        //         -> CSI Pe ; Pb ; Pr ; Pc ; Pp &    w

        //     Parameters are [event;button;row;column;page].
        //     Valid values for the event:
        //         Pe = 0    -> locator unavailable - no other parameters sent.
        //         Pe = 1    -> request - xterm received a DECRQLP.
        //         Pe = 2    -> left button down.
        //         Pe = 3    -> left button up.
        //         Pe = 4    -> middle button down.
        //         Pe = 5    -> middle button up.
        //         Pe = 6    -> right button down.
        //         Pe = 7    -> right button up.
        //         Pe = 8    -> M4 button down.
        //         Pe = 9    -> M4 button up.
        //         Pe = 1 0    -> locator outside filter rectangle.
        //     ``button'' parameter is a bitmask indicating which buttons are
        //         pressed:
        //         Pb = 0    <- no buttons down.
        //         Pb & 1    <- right button down.
        //         Pb & 2    <- middle button down.
        //         Pb & 4    <- left button down.
        //         Pb & 8    <- M4 button down.
        //     ``row'' and ``column'' parameters are the coordinates of the
        //         locator position in the xterm window, encoded as ASCII deci-
        //         mal.
        //     The ``page'' parameter is not used by xterm, and will be omit-
        //     ted.
        requestLocatorPosition : function(params) {
            ;
        },

        // CSI P m SP }
        // Insert P s Column(s) (default = 1) (DECIC), VT420 and up.
        // NOTE: xterm doesn't enable this code by default.
        insertColumns : function() {
            var param = params[0]
                , l = this.ybase + this.rows
                , ch = [this.eraseAttr(), ' '] // xterm?
                , i;

            while (param--) {
                for (i = this.ybase; i < l; i++) {
                    this.lines[i].splice(this.x + 1, 0, ch);
                    this.lines[i].pop();
                }
            }

            this.maxRange();
        },

        // CSI P m SP ~
        // Delete P s Column(s) (default = 1) (DECDC), VT420 and up
        // NOTE: xterm doesn't enable this code by default.
        deleteColumns : function() {
            var param = params[0]
                , l = this.ybase + this.rows
                , ch = [this.eraseAttr(), ' '] // xterm?
                , i;

            while (param--) {
                for (i = this.ybase; i < l; i++) {
                    this.lines[i].splice(this.x, 1);
                    this.lines[i].push(ch);
                }
            }

            this.maxRange();
        },

        /**
         * Prefix/Select/Visual/Search Modes
         */

        enterPrefix : function() {
            this.prefixMode = true;
        },

        leavePrefix : function() {
            this.prefixMode = false;
        },

        enterSelect : function() {
            this._real = {
                x: this.x,
                y: this.y,
                ydisp: this.ydisp,
                ybase: this.ybase,
                cursorHidden: this.cursorHidden,
                lines: this.copyBuffer(this.lines),
                write: this.write
            };
            this.write = function() {};
            this.selectMode = true;
            this.visualMode = false;
            this.cursorHidden = false;
            this.refresh(this.y, this.y);
        },

        leaveSelect : function() {
            this.x = this._real.x;
            this.y = this._real.y;
            this.ydisp = this._real.ydisp;
            this.ybase = this._real.ybase;
            this.cursorHidden = this._real.cursorHidden;
            this.lines = this._real.lines;
            this.write = this._real.write;
            delete this._real;
            this.selectMode = false;
            this.visualMode = false;
            this.refresh(0, this.rows - 1);
        },

        enterVisual : function() {
            this._real.preVisual = this.copyBuffer(this.lines);
            this.selectText(this.x, this.x, this.ydisp + this.y, this.ydisp + this.y);
            this.visualMode = true;
        },

        leaveVisual : function() {
            this.lines = this._real.preVisual;
            delete this._real.preVisual;
            delete this._selected;
            this.visualMode = false;
            this.refresh(0, this.rows - 1);
        },

        enterSearch : function(down) {
            this.entry = '';
            this.searchMode = true;
            this.searchDown = down;
            this._real.preSearch = this.copyBuffer(this.lines);
            this._real.preSearchX = this.x;
            this._real.preSearchY = this.y;
            this.entryPrefix = 'Search: ';
            var bottom = this.ydisp + this.rows - 1;
            for (var i = 0; i < this.entryPrefix.length; i++) {
                //this.lines[bottom][i][0] = (this.defAttr & ~0x1ff) | 4;
                //this.lines[bottom][i][1] = this.entryPrefix[i];
                this.lines[bottom][i] = [
                    (this.defAttr & ~0x1ff) | 4,
                    this.entryPrefix[i]
                ];
            }
            this.y = this.rows - 1;
            this.x = this.entryPrefix.length;
            this.refresh(this.rows - 1, this.rows - 1);
        },

        leaveSearch : function() {
            this.searchMode = false;

            if (this._real.preSearch) {
                this.lines = this._real.preSearch;
                this.x = this._real.preSearchX;
                this.y = this._real.preSearchY;
                delete this._real.preSearch;
                delete this._real.preSearchX;
                delete this._real.preSearchY;
            }

            this.refresh(this.rows - 1, this.rows - 1);
        },

        copyBuffer : function(lines) {
            var lines = lines || this.lines
                , out = [];

            for (var y = 0; y < lines.length; y++) {
                out[y] = [];
                for (var x = 0; x < lines[y].length; x++) {
                    out[y][x] = [lines[y][x][0], lines[y][x][1]];
                }
            }

            return out;
        },

        getCopyTextarea : function(text) {
            var textarea = this._copyTextarea
                , document = this.document;

            if (!textarea) {
                textarea = document.createElement('textarea');
                textarea.style.position = 'absolute';
                textarea.style.left = '-32000px';
                textarea.style.top = '-32000px';
                textarea.style.width = '0px';
                textarea.style.height = '0px';
                textarea.style.opacity = '0';
                textarea.style.backgroundColor = 'transparent';
                textarea.style.borderStyle = 'none';
                textarea.style.outlineStyle = 'none';

                document.getElementsByTagName('body')[0].appendChild(textarea);

                this._copyTextarea = textarea;
            }

            return textarea;
        },

        // NOTE: Only works for primary selection on X11.
        // Non-X11 users should use Ctrl-C instead.
        copyText : function(text) {
            var self = this
                , textarea = this.getCopyTextarea();

            this.trigger('copy', text);

            textarea.focus();
            textarea.textContent = text;
            textarea.value = text;
            textarea.setSelectionRange(0, text.length);

            setTimeout(function() {
                self.el.focus();
                self.focus();
            }, 1);
        },

        selectText : function(x1, x2, y1, y2) {
            var ox1
                , ox2
                , oy1
                , oy2
                , tmp
                , x
                , y
                , xl
                , attr;

            if (this._selected) {
                ox1 = this._selected.x1;
                ox2 = this._selected.x2;
                oy1 = this._selected.y1;
                oy2 = this._selected.y2;

                if (oy2 < oy1) {
                    tmp = ox2;
                    ox2 = ox1;
                    ox1 = tmp;
                    tmp = oy2;
                    oy2 = oy1;
                    oy1 = tmp;
                }

                if (ox2 < ox1 && oy1 === oy2) {
                    tmp = ox2;
                    ox2 = ox1;
                    ox1 = tmp;
                }

                for (y = oy1; y <= oy2; y++) {
                    x = 0;
                    xl = this.cols - 1;
                    if (y === oy1) {
                        x = ox1;
                    }
                    if (y === oy2) {
                        xl = ox2;
                    }
                    for (; x <= xl; x++) {
                        if (this.lines[y][x].old != null) {
                            //this.lines[y][x][0] = this.lines[y][x].old;
                            //delete this.lines[y][x].old;
                            attr = this.lines[y][x].old;
                            delete this.lines[y][x].old;
                            this.lines[y][x] = [attr, this.lines[y][x][1]];
                        }
                    }
                }

                y1 = this._selected.y1;
                x1 = this._selected.x1;
            }

            y1 = Math.max(y1, 0);
            y1 = Math.min(y1, this.ydisp + this.rows - 1);

            y2 = Math.max(y2, 0);
            y2 = Math.min(y2, this.ydisp + this.rows - 1);

            this._selected = { x1: x1, x2: x2, y1: y1, y2: y2 };

            if (y2 < y1) {
                tmp = x2;
                x2 = x1;
                x1 = tmp;
                tmp = y2;
                y2 = y1;
                y1 = tmp;
            }

            if (x2 < x1 && y1 === y2) {
                tmp = x2;
                x2 = x1;
                x1 = tmp;
            }

            for (y = y1; y <= y2; y++) {
                x = 0;
                xl = this.cols - 1;
                if (y === y1) {
                    x = x1;
                }
                if (y === y2) {
                    xl = x2;
                }
                for (; x <= xl; x++) {
                    //this.lines[y][x].old = this.lines[y][x][0];
                    //this.lines[y][x][0] &= ~0x1ff;
                    //this.lines[y][x][0] |= (0x1ff << 9) | 4;
                    attr = this.lines[y][x][0];
                    this.lines[y][x] = [
                        (attr & ~0x1ff) | ((0x1ff << 9) | 4),
                        this.lines[y][x][1]
                    ];
                    this.lines[y][x].old = attr;
                }
            }

            y1 = y1 - this.ydisp;
            y2 = y2 - this.ydisp;

            y1 = Math.max(y1, 0);
            y1 = Math.min(y1, this.rows - 1);

            y2 = Math.max(y2, 0);
            y2 = Math.min(y2, this.rows - 1);

            //this.refresh(y1, y2);
            this.refresh(0, this.rows - 1);
        },

        grabText : function(x1, x2, y1, y2) {
            var out = ''
                , buf = ''
                , ch
                , x
                , y
                , xl
                , tmp;

            if (y2 < y1) {
                tmp = x2;
                x2 = x1;
                x1 = tmp;
                tmp = y2;
                y2 = y1;
                y1 = tmp;
            }

            if (x2 < x1 && y1 === y2) {
                tmp = x2;
                x2 = x1;
                x1 = tmp;
            }

            for (y = y1; y <= y2; y++) {
                x = 0;
                xl = this.cols - 1;
                if (y === y1) {
                    x = x1;
                }
                if (y === y2) {
                    xl = x2;
                }
                for (; x <= xl; x++) {
                    ch = this.lines[y][x][1];
                    if (ch === ' ') {
                        buf += ch;
                        continue;
                    }
                    if (buf) {
                        out += buf;
                        buf = '';
                    }
                    out += ch;
                    if (isWide(ch)) x++;
                }
                buf = '';
                out += '\n';
            }

            // If we're not at the end of the
            // line, don't add a newline.
            for (x = x2, y = y2; x < this.cols; x++) {
                if (this.lines[y][x][1] !== ' ') {
                    out = out.slice(0, -1);
                    break;
                }
            }

            return out;
        },

        keyPrefix : function(ev, key) {
            if (key === 'k' || key === '&') {
                this.destroy();
            } else if (key === 'p' || key === ']') {
                this.trigger('request paste');
            } else if (key === 'c') {
                this.trigger('request create');
            } else if (key >= '0' && key <= '9') {
                key = +key - 1;
                if (!~key) key = 9;
                this.trigger('request term', key);
            } else if (key === 'n') {
                this.trigger('request term next');
            } else if (key === 'P') {
                this.trigger('request term previous');
            } else if (key === ':') {
                this.trigger('request command mode');
            } else if (key === '[') {
                this.enterSelect();
            }
        },

        keySelect : function(ev, key) {
            this.showCursor();

            if (this.searchMode || key === 'n' || key === 'N') {
                return this.keySearch(ev, key);
            }

            if (key === '\x04') { // ctrl-d
                var y = this.ydisp + this.y;
                if (this.ydisp === this.ybase) {
                    // Mimic vim behavior
                    this.y = Math.min(this.y + (this.rows - 1) / 2 | 0, this.rows - 1);
                    this.refresh(0, this.rows - 1);
                } else {
                    this.scrollDisp((this.rows - 1) / 2 | 0);
                }
                if (this.visualMode) {
                    this.selectText(this.x, this.x, y, this.ydisp + this.y);
                }
                return;
            }

            if (key === '\x15') { // ctrl-u
                var y = this.ydisp + this.y;
                if (this.ydisp === 0) {
                    // Mimic vim behavior
                    this.y = Math.max(this.y - (this.rows - 1) / 2 | 0, 0);
                    this.refresh(0, this.rows - 1);
                } else {
                    this.scrollDisp(-(this.rows - 1) / 2 | 0);
                }
                if (this.visualMode) {
                    this.selectText(this.x, this.x, y, this.ydisp + this.y);
                }
                return;
            }

            if (key === '\x06') { // ctrl-f
                var y = this.ydisp + this.y;
                this.scrollDisp(this.rows - 1);
                if (this.visualMode) {
                    this.selectText(this.x, this.x, y, this.ydisp + this.y);
                }
                return;
            }

            if (key === '\x02') { // ctrl-b
                var y = this.ydisp + this.y;
                this.scrollDisp(-(this.rows - 1));
                if (this.visualMode) {
                    this.selectText(this.x, this.x, y, this.ydisp + this.y);
                }
                return;
            }

            if (key === 'k') {
                var y = this.ydisp + this.y;
                this.y--;
                if (this.y < 0) {
                    this.y = 0;
                    this.scrollDisp(-1);
                }
                if (this.visualMode) {
                    this.selectText(this.x, this.x, y, this.ydisp + this.y);
                } else {
                    this.refresh(this.y, this.y + 1);
                }
                return;
            }

            if (key === 'j') {
                var y = this.ydisp + this.y;
                this.y++;
                if (this.y >= this.rows) {
                    this.y = this.rows - 1;
                    this.scrollDisp(1);
                }
                if (this.visualMode) {
                    this.selectText(this.x, this.x, y, this.ydisp + this.y);
                } else {
                    this.refresh(this.y - 1, this.y);
                }
                return;
            }

            if (key === 'h') {
                var x = this.x;
                this.x--;
                if (this.x < 0) {
                    this.x = 0;
                }
                if (this.visualMode) {
                    this.selectText(this.x, x, this.ydisp + this.y, this.ydisp + this.y);
                } else {
                    this.refresh(this.y, this.y);
                }
                return;
            }

            if (key === 'l') {
                var x = this.x;
                this.x++;
                if (this.x >= this.cols) {
                    this.x = this.cols - 1;
                }
                if (this.visualMode) {
                    this.selectText(x, this.x, this.ydisp + this.y, this.ydisp + this.y);
                } else {
                    this.refresh(this.y, this.y);
                }
                return;
            }

            if (key === 'v' || key === ' ') {
                if (!this.visualMode) {
                    this.enterVisual();
                } else {
                    this.leaveVisual();
                }
                return;
            }

            if (key === 'y') {
                if (this.visualMode) {
                    var text = this.grabText(
                        this._selected.x1, this._selected.x2,
                        this._selected.y1, this._selected.y2);
                    this.copyText(text);
                    this.leaveVisual();
                    // this.leaveSelect();
                }
                return;
            }

            if (key === 'q') {
                if (this.visualMode) {
                    this.leaveVisual();
                } else {
                    this.leaveSelect();
                }
                return;
            }

            if (key === 'w' || key === 'W') {
                var ox = this.x;
                var oy = this.y;
                var oyd = this.ydisp;

                var x = this.x;
                var y = this.y;
                var yb = this.ydisp;
                var saw_space = false;

                for (;;) {
                    var line = this.lines[yb + y];
                    while (x < this.cols) {
                        if (line[x][1] <= ' ') {
                            saw_space = true;
                        } else if (saw_space) {
                            break;
                        }
                        x++;
                    }
                    if (x >= this.cols) x = this.cols - 1;
                    if (x === this.cols - 1 && line[x][1] <= ' ') {
                        x = 0;
                        if (++y >= this.rows) {
                            y--;
                            if (++yb > this.ybase) {
                                yb = this.ybase;
                                x = this.x;
                                break;
                            }
                        }
                        continue;
                    }
                    break;
                }

                this.x = x, this.y = y;
                this.scrollDisp(-this.ydisp + yb);

                if (this.visualMode) {
                    this.selectText(ox, this.x, oy + oyd, this.ydisp + this.y);
                }
                return;
            }

            if (key === 'b' || key === 'B') {
                var ox = this.x;
                var oy = this.y;
                var oyd = this.ydisp;

                var x = this.x;
                var y = this.y;
                var yb = this.ydisp;

                for (;;) {
                    var line = this.lines[yb + y];
                    var saw_space = x > 0 && line[x][1] > ' ' && line[x - 1][1] > ' ';
                    while (x >= 0) {
                        if (line[x][1] <= ' ') {
                            if (saw_space && (x + 1 < this.cols && line[x + 1][1] > ' ')) {
                                x++;
                                break;
                            } else {
                                saw_space = true;
                            }
                        }
                        x--;
                    }
                    if (x < 0) x = 0;
                    if (x === 0 && (line[x][1] <= ' ' || !saw_space)) {
                        x = this.cols - 1;
                        if (--y < 0) {
                            y++;
                            if (--yb < 0) {
                                yb++;
                                x = 0;
                                break;
                            }
                        }
                        continue;
                    }
                    break;
                }

                this.x = x, this.y = y;
                this.scrollDisp(-this.ydisp + yb);

                if (this.visualMode) {
                    this.selectText(this.x, ox, this.ydisp + this.y, oy + oyd);
                }
                return;
            }

            if (key === 'e' || key === 'E') {
                var x = this.x + 1;
                var y = this.y;
                var yb = this.ydisp;
                if (x >= this.cols) x--;

                for (;;) {
                    var line = this.lines[yb + y];
                    while (x < this.cols) {
                        if (line[x][1] <= ' ') {
                            x++;
                        } else {
                            break;
                        }
                    }
                    while (x < this.cols) {
                        if (line[x][1] <= ' ') {
                            if (x - 1 >= 0 && line[x - 1][1] > ' ') {
                                x--;
                                break;
                            }
                        }
                        x++;
                    }
                    if (x >= this.cols) x = this.cols - 1;
                    if (x === this.cols - 1 && line[x][1] <= ' ') {
                        x = 0;
                        if (++y >= this.rows) {
                            y--;
                            if (++yb > this.ybase) {
                                yb = this.ybase;
                                break;
                            }
                        }
                        continue;
                    }
                    break;
                }

                this.x = x, this.y = y;
                this.scrollDisp(-this.ydisp + yb);

                if (this.visualMode) {
                    this.selectText(ox, this.x, oy + oyd, this.ydisp + this.y);
                }
                return;
            }

            if (key === '^' || key === '0') {
                var ox = this.x;

                if (key === '0') {
                    this.x = 0;
                } else if (key === '^') {
                    var line = this.lines[this.ydisp + this.y];
                    var x = 0;
                    while (x < this.cols) {
                        if (line[x][1] > ' ') {
                            break;
                        }
                        x++;
                    }
                    if (x >= this.cols) x = this.cols - 1;
                    this.x = x;
                }

                if (this.visualMode) {
                    this.selectText(this.x, ox, this.ydisp + this.y, this.ydisp + this.y);
                } else {
                    this.refresh(this.y, this.y);
                }
                return;
            }

            if (key === '$') {
                var ox = this.x;
                var line = this.lines[this.ydisp + this.y];
                var x = this.cols - 1;
                while (x >= 0) {
                    if (line[x][1] > ' ') {
                        if (this.visualMode && x < this.cols - 1) x++;
                        break;
                    }
                    x--;
                }
                if (x < 0) x = 0;
                this.x = x;
                if (this.visualMode) {
                    this.selectText(ox, this.x, this.ydisp + this.y, this.ydisp + this.y);
                } else {
                    this.refresh(this.y, this.y);
                }
                return;
            }

            if (key === 'g' || key === 'G') {
                var ox = this.x;
                var oy = this.y;
                var oyd = this.ydisp;
                if (key === 'g') {
                    this.x = 0, this.y = 0;
                    this.scrollDisp(-this.ydisp);
                } else if (key === 'G') {
                    this.x = 0, this.y = this.rows - 1;
                    this.scrollDisp(this.ybase);
                }
                if (this.visualMode) {
                    this.selectText(ox, this.x, oy + oyd, this.ydisp + this.y);
                }
                return;
            }

            if (key === 'H' || key === 'M' || key === 'L') {
                var ox = this.x;
                var oy = this.y;
                if (key === 'H') {
                    this.x = 0, this.y = 0;
                } else if (key === 'M') {
                    this.x = 0, this.y = this.rows / 2 | 0;
                } else if (key === 'L') {
                    this.x = 0, this.y = this.rows - 1;
                }
                if (this.visualMode) {
                    this.selectText(ox, this.x, this.ydisp + oy, this.ydisp + this.y);
                } else {
                    this.refresh(oy, oy);
                    this.refresh(this.y, this.y);
                }
                return;
            }

            if (key === '{' || key === '}') {
                var ox = this.x;
                var oy = this.y;
                var oyd = this.ydisp;

                var line;
                var saw_full = false;
                var found = false;
                var first_is_space = -1;
                var y = this.y + (key === '{' ? -1 : 1);
                var yb = this.ydisp;
                var i;

                if (key === '{') {
                    if (y < 0) {
                        y++;
                        if (yb > 0) yb--;
                    }
                } else if (key === '}') {
                    if (y >= this.rows) {
                        y--;
                        if (yb < this.ybase) yb++;
                    }
                }

                for (;;) {
                    line = this.lines[yb + y];

                    for (i = 0; i < this.cols; i++) {
                        if (line[i][1] > ' ') {
                            if (first_is_space === -1) {
                                first_is_space = 0;
                            }
                            saw_full = true;
                            break;
                        } else if (i === this.cols - 1) {
                            if (first_is_space === -1) {
                                first_is_space = 1;
                            } else if (first_is_space === 0) {
                                found = true;
                            } else if (first_is_space === 1) {
                                if (saw_full) found = true;
                            }
                            break;
                        }
                    }

                    if (found) break;

                    if (key === '{') {
                        y--;
                        if (y < 0) {
                            y++;
                            if (yb > 0) yb--;
                            else break;
                        }
                    } else if (key === '}') {
                        y++;
                        if (y >= this.rows) {
                            y--;
                            if (yb < this.ybase) yb++;
                            else break;
                        }
                    }
                }

                if (!found) {
                    if (key === '{') {
                        y = 0;
                        yb = 0;
                    } else if (key === '}') {
                        y = this.rows - 1;
                        yb = this.ybase;
                    }
                }

                this.x = 0, this.y = y;
                this.scrollDisp(-this.ydisp + yb);

                if (this.visualMode) {
                    this.selectText(ox, this.x, oy + oyd, this.ydisp + this.y);
                }
                return;
            }

            if (key === '/' || key === '?') {
                if (!this.visualMode) {
                    this.enterSearch(key === '/');
                }
                return;
            }

            return false;
        },

        keySearch : function(ev, key) {
            if (key === '\x1b') {
                this.leaveSearch();
                return;
            }

            if (key === '\r' || (!this.searchMode && (key === 'n' || key === 'N'))) {
                this.leaveSearch();

                var entry = this.entry;

                if (!entry) {
                    this.refresh(0, this.rows - 1);
                    return;
                }

                var ox = this.x;
                var oy = this.y;
                var oyd = this.ydisp;

                var line;
                var found = false;
                var wrapped = false;
                var x = this.x + 1;
                var y = this.ydisp + this.y;
                var yb, i;
                var up = key === 'N'
                    ? this.searchDown
                    : !this.searchDown;

                for (;;) {
                    line = this.lines[y];

                    while (x < this.cols) {
                        for (i = 0; i < entry.length; i++) {
                            if (x + i >= this.cols) break;
                            if (line[x + i][1] !== entry[i]) {
                                break;
                            } else if (line[x + i][1] === entry[i] && i === entry.length - 1) {
                                found = true;
                                break;
                            }
                        }
                        if (found) break;
                        x += i + 1;
                    }
                    if (found) break;

                    x = 0;

                    if (!up) {
                        y++;
                        if (y > this.ybase + this.rows - 1) {
                            if (wrapped) break;
                            // this.setMessage('Search wrapped. Continuing at TOP.');
                            wrapped = true;
                            y = 0;
                        }
                    } else {
                        y--;
                        if (y < 0) {
                            if (wrapped) break;
                            // this.setMessage('Search wrapped. Continuing at BOTTOM.');
                            wrapped = true;
                            y = this.ybase + this.rows - 1;
                        }
                    }
                }

                if (found) {
                    if (y - this.ybase < 0) {
                        yb = y;
                        y = 0;
                        if (yb > this.ybase) {
                            y = yb - this.ybase;
                            yb = this.ybase;
                        }
                    } else {
                        yb = this.ybase;
                        y -= this.ybase;
                    }

                    this.x = x, this.y = y;
                    this.scrollDisp(-this.ydisp + yb);

                    if (this.visualMode) {
                        this.selectText(ox, this.x, oy + oyd, this.ydisp + this.y);
                    }
                    return;
                }

                // this.setMessage("No matches found.");
                this.refresh(0, this.rows - 1);

                return;
            }

            if (key === '\b' || key === '\x7f') {
                if (this.entry.length === 0) return;
                var bottom = this.ydisp + this.rows - 1;
                this.entry = this.entry.slice(0, -1);
                var i = this.entryPrefix.length + this.entry.length;
                //this.lines[bottom][i][1] = ' ';
                this.lines[bottom][i] = [
                    this.lines[bottom][i][0],
                    ' '
                ];
                this.x--;
                this.refresh(this.rows - 1, this.rows - 1);
                this.refresh(this.y, this.y);
                return;
            }

            if (key.length === 1 && key >= ' ' && key <= '~') {
                var bottom = this.ydisp + this.rows - 1;
                this.entry += key;
                var i = this.entryPrefix.length + this.entry.length - 1;
                //this.lines[bottom][i][0] = (this.defAttr & ~0x1ff) | 4;
                //this.lines[bottom][i][1] = key;
                this.lines[bottom][i] = [
                    (this.defAttr & ~0x1ff) | 4,
                    key
                ];
                this.x++;
                this.refresh(this.rows - 1, this.rows - 1);
                this.refresh(this.y, this.y);
                return;
            }

            return false;
        }
    });

    // Colors 0-15 + 16-255
    // Much thanks to TooTallNate for writing this.
    Terminal.prototype.colors = (function() {
        var colors = Terminal.prototype.tangoColors.slice()
            , r = [0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff]
            , i;

        // 16-231
        i = 0;
        for (; i < 216; i++) {
            out(r[(i / 36) % 6 | 0], r[(i / 6) % 6 | 0], r[i % 6]);
        }

        // 232-255 (grey)
        i = 0;
        for (; i < 24; i++) {
            r = 8 + i * 10;
            out(r, r, r);
        }

        function out(r, g, b) {
            colors.push('#' + hex(r) + hex(g) + hex(b));
        }

        function hex(c) {
            c = c.toString(16);
            return c.length < 2 ? '0' + c : c;
        }

        // Default BG/FG
        colors[256] = '#000000';
        colors[257] = '#f0f0f0';
        return colors;
    })();

    Terminal.prototype._colors = Terminal.prototype.colors.slice();

    Terminal.prototype.vcolors = (function() {
        var out = []
            , colors = Terminal.prototype.colors
            , i = 0
            , color;

        for (; i < 256; i++) {
            color = parseInt(colors[i].substring(1), 16);
            out.push([
                (color >> 16) & 0xff,
                (color >> 8) & 0xff,
                color & 0xff
            ]);
        }

        return out;
    })();

    Terminal.prototype.defaults.colors = Terminal.prototype.colors;

    /**
     * Character Sets
     */

    Terminal.prototype.charsets = {};

    // DEC Special Character and Line Drawing Set.
    // http://vt100.net/docs/vt102-ug/table5-13.html
    // A lot of curses apps use this if they see TERM=xterm.
    // testing: echo -e '\e(0a\e(B'
    // The xterm output sometimes seems to conflict with the
    // reference above. xterm seems in line with the reference
    // when running vttest however.
    // The table below now uses xterm's output from vttest.
    Terminal.prototype.charsets.SCLD = { // (0
        '`': '\u25c6', // '◆'
        'a': '\u2592', // '▒'
        'b': '\u0009', // '\t'
        'c': '\u000c', // '\f'
        'd': '\u000d', // '\r'
        'e': '\u000a', // '\n'
        'f': '\u00b0', // '°'
        'g': '\u00b1', // '±'
        'h': '\u2424', // '\u2424' (NL)
        'i': '\u000b', // '\v'
        'j': '\u2518', // '┘'
        'k': '\u2510', // '┐'
        'l': '\u250c', // '┌'
        'm': '\u2514', // '└'
        'n': '\u253c', // '┼'
        'o': '\u23ba', // '⎺'
        'p': '\u23bb', // '⎻'
        'q': '\u2500', // '─'
        'r': '\u23bc', // '⎼'
        's': '\u23bd', // '⎽'
        't': '\u251c', // '├'
        'u': '\u2524', // '┤'
        'v': '\u2534', // '┴'
        'w': '\u252c', // '┬'
        'x': '\u2502', // '│'
        'y': '\u2264', // '≤'
        'z': '\u2265', // '≥'
        '{': '\u03c0', // 'π'
        '|': '\u2260', // '≠'
        '}': '\u00a3', // '£'
        '~': '\u00b7'    // '·'
    };

    Terminal.prototype.charsets.UK = null; // (A
    Terminal.prototype.charsets.US = null; // (B (USASCII)
    Terminal.prototype.charsets.Dutch = null; // (4
    Terminal.prototype.charsets.Finnish = null; // (C or (5
    Terminal.prototype.charsets.French = null; // (R
    Terminal.prototype.charsets.FrenchCanadian = null; // (Q
    Terminal.prototype.charsets.German = null; // (K
    Terminal.prototype.charsets.Italian = null; // (Y
    Terminal.prototype.charsets.NorwegianDanish = null; // (E or (6
    Terminal.prototype.charsets.Spanish = null; // (Z
    Terminal.prototype.charsets.Swedish = null; // (H or (7
    Terminal.prototype.charsets.Swiss = null; // (=
    Terminal.prototype.charsets.ISOLatin = null; // /A


    each(keys(Terminal.prototype.defaults), function(key) {
        Terminal.prototype[key] = Terminal.prototype.defaults[key];
        Terminal.prototype.options[key] = Terminal.prototype.defaults[key];
    });


    return Terminal;

});
