/**
 * Code Syntax Highlighter. Version 1.1.0
 * Copyright (C) 2004 Dream Projections Inc.
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 **
 * Usage example:
 *
 * <script src="shCore.js" type="text/javascript"></script>
 * <script src="shBrushXml.js" type="text/javascript"></script>
 *
 * <textarea name="code" language="html">
 * <img src="myimage.gif" border="0">
 * </textarea>
 *
 * <script>dp.SyntaxHighlighter.HighlightAll('code', 'value');</script>
 *
 **
 * History:
 * 1.1.0 - March 23rd, 2005
 *    - split brushes into separate files
 *    - now works in Safari
 *    - added missing strings to PHP matches
 *
 * 1.0.4 - February 2nd, 2005
 *    - added Delphi & Python
 *    - multi-line comments fixed
 *    - language name can be set through w3c valid 'class' attribute
 *    - HighlightAll(name, [showGutter], [showTools])
 *
 * 1.0.3 - December 31th, 2004 (added PHP & SQL)
 * 1.0.2 - December 28th, 2004 (refactoring with namespaces)
 * 1.0.1 - December 14th, 2004
 * 1.0.0 - November 13th, 2004
 */

// create namespaces
var dp = {
	sh :						// dp.sh
	{
			Utils	: {},		// dp.sh.Utils
			Brushes	: {}		// dp.sh.Brushes
	}
};

dp.sh.Config = {
	Version	: '1.1.0',
	About	: '<html><head><title>About...</title></head><body class="dp-about"><table cellspacing="0"><tr><td class="copy"><div class="para title">dp.SyntaxHighlighter</div><div class="para">Version: {V}</div><div class="para"><a href="http://www.dreamprojections.com/sh/?ref=about" target="_blank">http://www.dreamprojections.com/SyntaxHighlighter</a></div>&copy;2004-2005 Dream Projections Inc. 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;



// 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('The code is in your clipboard now.');
	}
}

// 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');
	var doc	= wnd.document;
	
	var styles	= document.getElementsByTagName('style');
	var links	= document.getElementsByTagName('link');
	
	doc.write(dp.sh.Config.About.replace('{V}', dp.sh.Config.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();
}





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





dp.sh.Highlighter = function()
{
	this.addGutter		= true;
	this.addControls	= true;
	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 another
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++)
	{
		var line = lines[i];
		result += ProcessLine(line, tabSize) + '\n';
	}
	
	return result;
}

dp.sh.Highlighter.prototype.SwitchToTable = function()
{
	// Safari fix: for some reason lowercase <br /> isn't getting picked up, even though 'i' is set
	var lines	= this.div.innerHTML.split(/<br \/>/gi);
	var row		= null;
	var cell	= 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>';
	}
	
	row = this.table.insertRow(-1);
	
	if(this.addGutter == true)
	{
		cell			= row.insertCell(-1);
		cell.className	= 'tools-corner';
	}

	if(this.addControls == true)
	{
		cell			= row.insertCell(-1);
		
		cell.originalCode	= this.originalCode;
		cell.processedCode	= this.code;
		
		cell.className		= 'tools';
		cell.innerHTML		= UtilHref('ViewSource', 'view plain') + pipe + UtilHref('PrintSource', 'print');
		
		if(window.clipboardData)
		{
			cell.innerHTML += pipe + UtilHref('ToClipboard', 'copy to clipboard');
		}
		
		cell.innerHTML += pipe + UtilHref('About', '?');
	}

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

		cell			= row.insertCell(-1);
		cell.className	= 'line';
		cell.innerHTML	= lines[i];
	}
	
	this.div.innerHTML	= '';
}

dp.sh.Highlighter.prototype.Highlight = function(code)
{
	// This function strips all new lines and spaces
	// from the beging and end of the string .
	function Trim(str)
	{
		var begining	= new RegExp('^[\\s\\n]', 'g');
		var end			= new RegExp('[\\s\\n]$', 'g');

		while(begining.test(str))
		{
			str = str.substr(1);
		}

		while(end.test(str))
		{
			str = str.substr(0, str.length - 1);
		}
		
		return str;
	}
	
	// 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			= Trim(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, do nothing
	if(this.matches.length == 0)
	{
		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 */)
{
	var elements		= document.getElementsByName(name);
	var highlighter		= null;
	var registered		= new Object();
	var propertyName	= 'value';
	
	function FindValue()
	{
		var a = arguments;
		
		for(var i = 0; i < a.length; i++)
			if(a[i] != null && ((typeof(a[i]) == 'string' && a[i] != '') || (typeof(a[i]) == 'object' && a[i].value != '')))
				return a[i];
		
		return null;
	}
	
	if(elements == null)
	{
		return;
	}

	// if showGutter isn't set, default to TRUE
	if(showGutter == null)
	{
		showGutter = true;
	}
	
	// if showControls isn't set, default to TRUE
	if(showControls == null)
	{
		showControls = true;
	}

	// 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 language	= FindValue(element.attributes['class'], element.className, element.attributes['language'], element.language);
		
		if(language == null)
			continue;
		
		if(language.value)
			language = language.value;

		language = (language + '').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;
		highlighter.addControls	= showControls;
		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);		
	}	
}
