/**
 * 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 :					// dp.sh
	{
		Utils	: {},		// dp.sh.Utils
		Brushes	: {},		// dp.sh.Brushes
		Strings : {},
		Version : '1.3.0'
	}
};

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>',
	
	// tools
	ExpandCode : '+ expand code',
	ViewPlain : '', //'view plain',
	Print : '', //'print',
	CopyToClipboard : 'copy to clipboard',
	About : '', //'?',
	
	CopiedToClipboard : 'The code is in your clipboard now.'
};

dp.SyntaxHighlighter = dp.sh;

//
// Dialog and toolbar functions
//

dp.sh.Utils.Expand = function(sender)
{
	var table = sender;
	var span = sender;

	// find the span in which the text label and pipe contained so we can hide it
	while(span != null && span.tagName != 'SPAN')
		span = span.parentNode;

	// find the table
	while(table != null && table.tagName != 'TABLE')
		table = table.parentNode;
	
	// remove the 'expand code' button
	span.parentNode.removeChild(span);
	
	table.tBodies[0].className = 'show';
	table.parentNode.style.height = '100%'; // containing div isn't getting updated properly when the TBODY is shown
}

// opens a new windows and puts the original unformatted source code inside.
dp.sh.Utils.ViewSource = function(sender)
{
	var code = sender.parentNode.originalCode;
	var wnd = window.open('', '_blank', 'width=750, height=400, location=0, resizable=1, menubar=0, scrollbars=1');
	
	code = code.replace(/</g, '&lt;');
	
	wnd.document.write('<pre>' + code + '</pre>');
	wnd.document.close();
}

// copies the original source code in to the clipboard (IE only)
dp.sh.Utils.ToClipboard = function(sender)
{
	var code = sender.parentNode.originalCode;
	
	// This works only for IE. There's a way to make it work with Mozilla as well,
	// but it requires security settings changed on the client, which isn't by
	// default, so 99% of users won't have it working anyways.
	if(window.clipboardData)
	{
		window.clipboardData.setData('text', code);
		
		alert(dp.sh.Strings.CopiedToClipboard);
	}
}

// creates an invisible iframe, puts the original source code inside and prints it
dp.sh.Utils.PrintSource = function(sender)
{
	var td		= sender.parentNode;
	var code	= td.processedCode;
	var iframe	= document.createElement('IFRAME');
	var doc		= null;
	var wnd		= 

	// this hides the iframe
	iframe.style.cssText = 'position:absolute; width:0px; height:0px; left:-5px; top:-5px;';
	
	td.appendChild(iframe);
	
	doc = iframe.contentWindow.document;
	code = code.replace(/</g, '&lt;');
	
	doc.open();
	doc.write('<pre>' + code + '</pre>');
	doc.close();
	
	iframe.contentWindow.focus();
	iframe.contentWindow.print();
	
	td.removeChild(iframe);
}

dp.sh.Utils.About = function()
{
	var wnd	= window.open('', '_blank', 'dialog,width=320,height=150,scrollbars=0');
	var doc	= wnd.document;
	
	var styles = document.getElementsByTagName('style');
	var links = document.getElementsByTagName('link');
	
	doc.write(dp.sh.Strings.AboutDialog.replace('{V}', dp.sh.Version));
	
	// copy over ALL the styles from the parent page
	for(var i = 0; i < styles.length; i++)
		doc.write('<style>' + styles[i].innerHTML + '</style>');

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

//
// 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;
}

// 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;
}

// 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)
{
	var span = document.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			= document.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(document.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;
	
	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.SwitchToTable = 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');
	var row		= null;
	var cell	= null;
	var tBody	= null;
	var html	= '';
	var pipe	= ''; //' | ';

	// creates an anchor to a utility
	function UtilHref(util, text)
	{
		return '<a href="#" onclick="dp.sh.Utils.' + util + '(this); return false;">' + text + '</a>';
	}
	
	tBody = document.createElement('TBODY');	// can be created and all others go to tBodies collection.

	this.table.appendChild(tBody);
		
	if(this.addGutter == true)
	{
		row = tBody.insertRow(-1);
		cell = row.insertCell(-1);
		cell.className = 'tools-corner';
	}

	if(this.addControls == true)
	{
		var tHead = document.createElement('THEAD');	// controls will be placed in here
		this.table.appendChild(tHead);

		row = tHead.insertRow(-1);

		// add corner if there's a gutter
		if(this.addGutter == true)
		{
			cell = row.insertCell(-1);
			cell.className = 'tools-corner';
		}
		
		cell = row.insertCell(-1);
		
		// preserve some variables for the controls
		cell.originalCode = this.originalCode;
		cell.processedCode = this.code;
		cell.className = 'tools';
		
		if(this.collapse == true)
		{
			tBody.className = 'hide';
			cell.innerHTML += '<span><b>' + UtilHref('Expand', dp.sh.Strings.ExpandCode) + '</b>' + pipe + '</span>';
		}

		cell.innerHTML += UtilHref('ViewSource', dp.sh.Strings.ViewPlain) + pipe + UtilHref('PrintSource', dp.sh.Strings.Print);
		
		// IE has this clipboard object which is easy enough to use
		if(window.clipboardData)
			cell.innerHTML += pipe + UtilHref('ToClipboard', dp.sh.Strings.CopyToClipboard);
		
		cell.innerHTML += pipe + UtilHref('About', dp.sh.Strings.About);
	}

	for(var i = 0, lineIndex = this.firstLine; i < lines.length - 1; i++, lineIndex++)
	{
		row = tBody.insertRow(-1);
		
		if(this.addGutter == true)
		{
			cell = row.insertCell(-1);
			cell.className = 'gutter';
			cell.innerHTML = lineIndex;
		}

		cell = row.insertCell(-1);
		cell.className = 'line' + (i % 2 + 1);		// uses .line1 and .line2 css styles for alternating lines
		cell.innerHTML = lines[i];
	}
	
	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 = document.createElement('DIV');
	this.table = document.createElement('TABLE');
	this.matches = new Array();

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

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

	this.table.border = 0;
	this.table.cellSpacing = 0;
	this.table.cellPadding = 0;

	this.ProcessRegexList();	

	// if no matches found, add entire code as plain text
	if(this.matches.length == 0)
	{
		this.AddBit(this.code, null);
		this.SwitchToTable();
		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 highligting 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.SwitchToTable();
}

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 */)
{
	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;
		
		// first line idea comes from Andrew Collington, thanks!
		highlighter.firstLine = (firstLine == null) ? parseInt(GetOptionValue('firstline', options, 1)) : firstLine;

		highlighter.Highlight(element[propertyName]);

		// place the result table inside a div
		var div = document.createElement('DIV');
		
		div.className = 'dp-highlighter';
		div.appendChild(highlighter.table);

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