/**
 * Code Syntax Highlighter.
 * Version 1.3.0
 * Copyright (C) 2004 Alex Gorbatchev.
 * http://www.dreamprojections.com/syntaxhighlighter/
 * 
 * This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General 
 * Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) 
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied 
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more 
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to 
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 */

//
// create namespaces
//
var dp = {
	sh :
	{
		Toolbar : {},
		Utils	: {},
		RegexLib: {},
		Brushes	: {},
		Strings : {},
		Version : '1.4.0'
	}
};

dp.sh.Strings = {
	AboutDialog : '<html><head><title>About...</title></head><body class="dp-about"><table cellspacing="0"><tr><td class="copy"><p class="title">dp.SyntaxHighlighter</div><div class="para">Version: {V}</p><p><a href="http://www.dreamprojections.com/syntaxhighlighter/?ref=about" target="_blank">http://www.dreamprojections.com/SyntaxHighlighter</a></p>&copy;2004-2005 Alex Gorbatchev. All right reserved.</td></tr><tr><td class="footer"><input type="button" class="close" value="OK" onClick="window.close()"/></td></tr></table></body></html>'
};

dp.SyntaxHighlighter = dp.sh;

//
// Toolbar functions
//

dp.sh.Toolbar.Commands = {
	ExpandSource: {
		label: '+ expand source',
		check: function(highlighter) { return highlighter.collapse; },
		func: function(sender, highlighter)
		{
			sender.parentNode.removeChild(sender);
			highlighter.div.className = highlighter.div.className.replace('collapsed', '');
		}
	},
	
	// opens a new windows and puts the original unformatted source code inside.
	ViewSource: {
		label: 'view plain',
		func: function(sender, highlighter)
		{
			var code = highlighter.originalCode.replace(/</g, '&lt;');
			var wnd = window.open('', '_blank', 'width=750, height=400, location=0, resizable=1, menubar=0, scrollbars=1');
			wnd.document.write('<textarea style="width:99%;height:99%">' + code + '</textarea>');
			wnd.document.close();
		}
	},
	
	// copies the original source code in to the clipboard (IE only)
	CopyToClipboard: {
		label: 'copy to clipboard',
		check: function() { return window.clipboardData != null; },
		func: function(sender, highlighter)
		{
			window.clipboardData.setData('text', highlighter.originalCode);
			alert('The code is in your clipboard now');
		}
	},
	
	// creates an invisible iframe, puts the original source code inside and prints it
	PrintSource: {
		label: 'print',
		func: function(sender, highlighter)
		{
			var iframe = document.createElement('IFRAME');
			var doc = null;

			// this hides the iframe
			iframe.style.cssText = 'position:absolute;width:0px;height:0px;left:-500px;top:-500px;';
			
			document.body.appendChild(iframe);
			doc = iframe.contentWindow.document;

			dp.sh.Utils.CopyStyles(doc, window.document);
			doc.write('<div class="' + highlighter.div.className.replace('collapsed', '') + ' printing">' + highlighter.div.innerHTML + '</div>');
			doc.close();

			iframe.contentWindow.focus();
			iframe.contentWindow.print();
			
			alert('Printing...');
			
			document.body.removeChild(iframe);
		}
	},
	
	About: {
		label: '?',
		func: function(highlighter)
		{
			var wnd	= window.open('', '_blank', 'dialog,width=300,height=150,scrollbars=0');
			var doc	= wnd.document;

			dp.sh.Utils.CopyStyles(doc, window.document);
			
			doc.write(dp.sh.Strings.AboutDialog.replace('{V}', dp.sh.Version));
			doc.close();
			wnd.focus();
		}
	}
};

// creates a <div /> with all toolbar links
dp.sh.Toolbar.Create = function(highlighter)
{
	var div = document.createElement('DIV');
	
	div.className = 'tools';
	
	for(var name in dp.sh.Toolbar.Commands)
	{
		var cmd = dp.sh.Toolbar.Commands[name];
		
		if(cmd.check != null && !cmd.check(highlighter))
			continue;
		
		div.innerHTML += '<a href="#" onclick="dp.sh.Toolbar.Command(\'' + name + '\',this);return false;">' + cmd.label + '</a>';
	}
	
	return div;
}

// executes toolbar command by name
dp.sh.Toolbar.Command = function(name, sender)
{
	var n = sender;
	
	while(n != null && n.className.indexOf('dp-highlighter') == -1)
		n = n.parentNode;
	
	if(n != null)
		dp.sh.Toolbar.Commands[name].func(sender, n.highlighter);
}

// copies all <link rel="stylesheet" /> from 'target' window to 'dest'
dp.sh.Utils.CopyStyles = function(destDoc, sourceDoc)
{
	var links = sourceDoc.getElementsByTagName('link');

	for(var i = 0; i < links.length; i++)
		if(links[i].rel.toLowerCase() == 'stylesheet')
			destDoc.write('<link type="text/css" rel="stylesheet" href="' + links[i].href + '"></link>');
}

//
// Common reusable regular expressions
//
dp.sh.RegexLib = {
	MultiLineCComments : new RegExp('/\\*[\\s\\S]*?\\*/', 'gm'),
	SingleLineCComments : new RegExp('//.*$', 'gm'),
	SingleLinePerlComments : new RegExp('#.*$', 'gm'),
	DoubleQuotedString : new RegExp('"(?:\\.|(\\\\\\")|[^\\""])*"','g'),
	SingleQuotedString : new RegExp("'(?:\\.|(\\\\\\')|[^\\''])*'", 'g')
};

//
// Match object
//
dp.sh.Match = function(value, index, css)
{
	this.value = value;
	this.index = index;
	this.length = value.length;
	this.css = css;
}

//
// Highlighter object
//
dp.sh.Highlighter = function()
{
	this.addGutter = true;
	this.addControls = true;
	this.collapse = false;
	this.tabsToSpaces = true;
	this.wrapColumn = 80;
	this.showColumns = true;
}

// static callback for the match sorting
dp.sh.Highlighter.SortCallback = function(m1, m2)
{
	// sort matches by index first
	if(m1.index < m2.index)
		return -1;
	else if(m1.index > m2.index)
		return 1;
	else
	{
		// if index is the same, sort by length
		if(m1.length < m2.length)
			return -1;
		else if(m1.length > m2.length)
			return 1;
	}
	return 0;
}

dp.sh.Highlighter.prototype.CreateElement = function(name)
{
	var result = document.createElement(name);
	result.highlighter = this;
	return result;
}

// gets a list of all matches for a given regular expression
dp.sh.Highlighter.prototype.GetMatches = function(regex, css)
{
	var index = 0;
	var match = null;

	while((match = regex.exec(this.code)) != null)
		this.matches[this.matches.length] = new dp.sh.Match(match[0], match.index, css);
}

dp.sh.Highlighter.prototype.AddBit = function(str, css)
{
	if(str == null || str.length == 0)
		return;

	var span = this.CreateElement('SPAN');
	
	str = str.replace(/&/g, '&amp;');
	str = str.replace(/ /g, '&nbsp;');
	str = str.replace(/</g, '&lt;');
	str = str.replace(/\n/gm, '&nbsp;<br>');

	// when adding a piece of code, check to see if it has line breaks in it 
	// and if it does, wrap individual line breaks with span tags
	if(css != null)
	{
		var regex = new RegExp('<br>', 'gi');
		
		if(regex.test(str))
		{
			var lines = str.split('&nbsp;<br>');
			
			str = '';
			
			for(var i = 0; i < lines.length; i++)
			{
				span = this.CreateElement('SPAN');
				span.className = css;
				span.innerHTML = lines[i];
				
				this.div.appendChild(span);
				
				// don't add a <BR> for the last line
				if(i + 1 < lines.length)
					this.div.appendChild(this.CreateElement('BR'));
			}
		}
		else
		{
			span.className = css;
			span.innerHTML = str;
			this.div.appendChild(span);
		}
	}
	else
	{
		span.innerHTML = str;
		this.div.appendChild(span);
	}
}

// checks if one match is inside any other match
dp.sh.Highlighter.prototype.IsInside = function(match)
{
	if(match == null || match.length == 0)
		return false;
	
	for(var i = 0; i < this.matches.length; i++)
	{
		var c = this.matches[i];
		
		if(c == null)
			continue;

		if((match.index > c.index) && (match.index < c.index + c.length))
			return true;
	}
	
	return false;
}

dp.sh.Highlighter.prototype.ProcessRegexList = function()
{
	for(var i = 0; i < this.regexList.length; i++)
		this.GetMatches(this.regexList[i].regex, this.regexList[i].css);
}

dp.sh.Highlighter.prototype.ProcessSmartTabs = function(code)
{
	var lines	= code.split('\n');
	var result	= '';
	var tabSize	= 4;
	var tab		= '\t';

	// This function inserts specified amount of spaces in the string
	// where a tab is while removing that given tab. 
	function InsertSpaces(line, pos, count)
	{
		var left	= line.substr(0, pos);
		var right	= line.substr(pos + 1, line.length);	// pos + 1 will get rid of the tab
		var spaces	= '';
		
		for(var i = 0; i < count; i++)
			spaces += ' ';
		
		return left + spaces + right;
	}

	// This function process one line for 'smart tabs'
	function ProcessLine(line, tabSize)
	{
		if(line.indexOf(tab) == -1)
			return line;

		var pos = 0;

		while((pos = line.indexOf(tab)) != -1)
		{
			// This is pretty much all there is to the 'smart tabs' logic.
			// Based on the position within the line and size of a tab, 
			// calculate the amount of spaces we need to insert.
			var spaces = tabSize - pos % tabSize;
			
			line = InsertSpaces(line, pos, spaces);
		}
		
		return line;
	}

	// Go through all the lines and do the 'smart tabs' magic.
	for(var i = 0; i < lines.length; i++)
		result += ProcessLine(lines[i], tabSize) + '\n';
	
	return result;
}

dp.sh.Highlighter.prototype.SwitchToList = function()
{
	// thanks to Lachlan Donald from SitePoint.com for this <br/> tag fix.
	var html = this.div.innerHTML.replace(/<(br)\/?>/gi, '\n');
	var lines = html.split('\n');
	
	if(this.addControls == true)
		this.bar.appendChild(dp.sh.Toolbar.Create(this));

	// add columns ruler
	if(this.showColumns)
	{
		var div = this.CreateElement('div');
		var columns = this.CreateElement('div');
		var showEvery = 10;
		var i = 1;
		
		while(i <= 150)
		{
			if(i % showEvery == 0)
			{
				div.innerHTML += i;
				i += (i + '').length;
			}
			else
			{
				div.innerHTML += '&middot;';
				i++;
			}
		}
		
		columns.className = 'columns';
		columns.appendChild(div);
		this.bar.appendChild(columns);
	}

	for(var i = 0, lineIndex = this.firstLine; i < lines.length - 1; i++, lineIndex++)
	{
		var li = this.CreateElement('LI');
		var span = this.CreateElement('SPAN');
		
		// uses .line1 and .line2 css styles for alternating lines
		li.className = (i % 2 == 0) ? 'alt' : '';
		span.innerHTML = lines[i] + '&nbsp;';

		li.appendChild(span);
		this.ol.appendChild(li);
	}
	
	this.div.innerHTML	= '';
}

dp.sh.Highlighter.prototype.Highlight = function(code)
{
	function Trim(str)
	{
		return str.replace(/^\s*(.*?)[\s\n]*$/g, '$1');
	}
	
	function Chop(str)
	{
		return str.replace(/\n*$/, '').replace(/^\n*/, '');
	}

	function Unindent(str)
	{
		var lines = str.split('\n');
		var indents = new Array();
		var regex = new RegExp('^\\s*', 'g');
		var min = 1000;

		// go through every line and check for common number of indents
		for(var i = 0; i < lines.length && min > 0; i++)
		{
			if(Trim(lines[i]).length == 0)
				continue;
				
			var matches = regex.exec(lines[i]);

			if(matches != null && matches.length > 0)
				min = Math.min(matches[0].length, min);
		}

		// trim minimum common number of white space from the begining of every line
		if(min > 0)
			for(var i = 0; i < lines.length; i++)
				lines[i] = lines[i].substr(min);

		return lines.join('\n');
	}
	
	// This function returns a portions of the string from pos1 to pos2 inclusive
	function Copy(string, pos1, pos2)
	{
		return string.substr(pos1, pos2 - pos1);
	}

	var pos	= 0;
	
	this.originalCode = code;
	this.code = Chop(Unindent(code));
	this.div = this.CreateElement('DIV');
	this.bar = this.CreateElement('DIV');
	this.ol = this.CreateElement('OL');
	this.matches = new Array();

	this.div.className = 'dp-highlighter';
	this.div.highlighter = this;
	
	this.bar.className = 'bar';
	
	// set the first line
	this.ol.start = this.firstLine;

	if(this.CssClass != null)
		this.ol.className = this.CssClass;

	if(this.collapse)
		this.div.className += ' collapsed';

	// replace tabs with spaces
	if(this.tabsToSpaces == true)
		this.code = this.ProcessSmartTabs(this.code);

	this.ProcessRegexList();	

	// if no matches found, add entire code as plain text
	if(this.matches.length == 0)
	{
		this.AddBit(this.code, null);
		this.SwitchToList();
		this.div.appendChild(this.ol);
		return;
	}

	// sort the matches
	this.matches = this.matches.sort(dp.sh.Highlighter.SortCallback);

	// The following loop checks to see if any of the matches are inside
	// of other matches. This process would get rid of highligted strings
	// inside comments, keywords inside strings and so on.
	for(var i = 0; i < this.matches.length; i++)
		if(this.IsInside(this.matches[i]))
			this.matches[i] = null;

	// Finally, go through the final list of matches and pull the all
	// together adding everything in between that isn't a match.
	for(var i = 0; i < this.matches.length; i++)
	{
		var match = this.matches[i];

		if(match == null || match.length == 0)
			continue;

		this.AddBit(Copy(this.code, pos, match.index), null);
		this.AddBit(match.value, match.css);

		pos = match.index + match.length;
	}
	
	this.AddBit(this.code.substr(pos), null);

	this.SwitchToList();
	this.div.appendChild(this.bar);
	this.div.appendChild(this.ol);
}

dp.sh.Highlighter.prototype.GetKeywords = function(str) 
{
	return '\\b' + str.replace(/ /g, '\\b|\\b') + '\\b';
}

// highlightes all elements identified by name and gets source code from specified property
dp.sh.HighlightAll = function(name, showGutter /* optional */, showControls /* optional */, collapseAll /* optional */, firstLine /* optional */, showColumns /* optional */)
{
	function FindValue()
	{
		var a = arguments;
		
		for(var i = 0; i < a.length; i++)
		{
			if(a[i] == null)
				continue;
				
			if(typeof(a[i]) == 'string' && a[i] != '')
				return a[i] + '';
		
			if(typeof(a[i]) == 'object' && a[i].value != '')
				return a[i].value + '';
		}
		
		return null;
	}
	
	function IsOptionSet(value, list)
	{
		for(var i = 0; i < list.length; i++)
			if(list[i] == value)
				return true;
		
		return false;
	}
	
	function GetOptionValue(name, list, defaultValue)
	{
		var regex = new RegExp('^' + name + '\\[(\\w+)\\]$', 'gi');
		var matches = null;

		for(var i = 0; i < list.length; i++)
			if((matches = regex.exec(list[i])) != null)
				return matches[1];
		
		return defaultValue;
	}

	var elements = document.getElementsByName(name);
	var highlighter = null;
	var registered = new Object();
	var propertyName = 'value';
	
	// if no code blocks found, leave
	if(elements == null)
		return;

	// register all brushes
	for(var brush in dp.sh.Brushes)
	{
		var aliases = dp.sh.Brushes[brush].Aliases;

		if(aliases == null)
			continue;
		
		for(var i = 0; i < aliases.length; i++)
			registered[aliases[i]] = brush;
	}

	for(var i = 0; i < elements.length; i++)
	{
		var element = elements[i];
		var options = FindValue(
				element.attributes['class'], element.className, 
				element.attributes['language'], element.language
				);
		var language = '';
		
		if(options == null)
			continue;
		
		options = options.split(':');
		
		language = options[0].toLowerCase();

		if(registered[language] == null)
			continue;
		
		// instantiate a brush
		highlighter = new dp.sh.Brushes[registered[language]]();
		
		// hide the original element
		element.style.display = 'none';

		highlighter.addGutter = (showGutter == null) ? !IsOptionSet('nogutter', options) : showGutter;
		highlighter.addControls = (showControls == null) ? !IsOptionSet('nocontrols', options) : showControls;
		highlighter.collapse = (collapseAll == null) ? IsOptionSet('collapse', options) : collapseAll;
		highlighter.showColumns = (showColumns == null) ? IsOptionSet('showcolumns', options) : showColumns;
		
		// first line idea comes from Andrew Collington, thanks!
		highlighter.firstLine = (firstLine == null) ? parseInt(GetOptionValue('firstline', options, 1)) : firstLine;

		highlighter.Highlight(element[propertyName]);

		element.parentNode.insertBefore(highlighter.div, element);
	}	
}
