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/*
 * CodePress - Real Time Syntax Highlighting Editor written in JavaScript - http://codepress.org/
 * 
 * Copyright (C) 2007 Fernando M.A.d.S. 
 *
 * Contributors :
 *
 * 	Michael Hurni 
 *
 * This program 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.
 * 
 * Read the full licence: http://www.opensource.org/licenses/lgpl-license.php
 */


CodePress = {
	scrolling : false,
	autocomplete : true,

	// set initial vars and start sh
	initialize : function() {
		if(typeof(editor)=='undefined' && !arguments[0]) return;
		chars = '|32|46|62|'; // charcodes that trigger syntax highlighting
		cc = '\u2009'; // control char
		editor = document.getElementsByTagName('body')[0];
		document.designMode = 'on';
		document.addEventListener('keyup', this.keyHandler, true);
		window.addEventListener('scroll', function() { if(!CodePress.scrolling) CodePress.syntaxHighlight('scroll') }, false);
		completeChars = this.getCompleteChars();
//		CodePress.syntaxHighlight('init');
	},

	// treat key bindings
	keyHandler : function(evt) {
    	keyCode = evt.keyCode;	
		charCode = evt.charCode;

		if((evt.ctrlKey || evt.metaKey) && evt.shiftKey && charCode!=90)  { // shortcuts = ctrl||appleKey+shift+key!=z(undo) 
			CodePress.shortcuts(charCode?charCode:keyCode);
		}
		else if(completeChars.indexOf('|'+String.fromCharCode(charCode)+'|')!=-1 && CodePress.autocomplete) { // auto complete
			CodePress.complete(String.fromCharCode(charCode));
		}
	    else if(chars.indexOf('|'+charCode+'|')!=-1||keyCode==13) { // syntax highlighting
		 	CodePress.syntaxHighlight('generic');
		}
		else if(keyCode==9 || evt.tabKey) {  // snippets activation (tab)
			CodePress.snippets(evt);
		}
		else if(keyCode==46||keyCode==8) { // save to history when delete or backspace pressed
		 	CodePress.actions.history[CodePress.actions.next()] = editor.innerHTML;
		}
		else if((charCode==122||charCode==121||charCode==90) && evt.ctrlKey) { // undo and redo
			(charCode==121||evt.shiftKey) ? CodePress.actions.redo() :  CodePress.actions.undo(); 
			evt.preventDefault();
		}
		else if(keyCode==86 && evt.ctrlKey)  { // paste
			// TODO: pasted text should be parsed and highlighted
		}
	},

	// put cursor back to its original position after every parsing
	findString : function() {
		var sel = window.getSelection();
		var range = window.document.createRange();
		var span = window.document.getElementsByTagName('span')[0];
			
		range.selectNode(span);
		sel.removeAllRanges();
		sel.addRange(range);
		span.parentNode.removeChild(span);
		//if(self.find(cc))
		//window.getSelection().getRangeAt(0).deleteContents();
	},
	
	// split big files, highlighting parts of it
	split : function(code,flag) {
		if(flag=='scroll') {
			this.scrolling = true;
			return code;
		}
		else {
			this.scrolling = false;
			mid = code.indexOf('');
			if(mid-2000<0) {ini=0;end=4000;}
			else if(mid+2000>code.length) {ini=code.length-4000;end=code.length;}
			else {ini=mid-2000;end=mid+2000;}
			code = code.substring(ini,end);
			return code;
		}
	},
	
	// syntax highlighting parser
	syntaxHighlight : function(flag) {
		//if(document.designMode=='off') document.designMode='on'
		if(flag!='init') {
			var span = document.createElement('span');
			window.getSelection().getRangeAt(0).insertNode(span);
		}

		o = editor.innerHTML;
//		o = o.replace(/
/g,'\r\n');
//		o = o.replace(/<(b|i|s|u|a|em|tt|ins|big|cite|strong)?>/g,'');
		//alert(o)
		o = o.replace(/<(?!span|\/span|br).*?>/gi,'');
//		alert(o)
//		x = o;
		x = z = this.split(o,flag);
		//alert(z)
//		x = x.replace(/\r\n/g,'
');
		x = x.replace(/\t/g, '        ');


		if(arguments[1]&&arguments[2]) x = x.replace(arguments[1],arguments[2]);
	
		for(i=0;i/g,'>');
				if(content.indexOf('$0')<0) content += cc;
				else content = content.replace(/\$0/,cc);
				content = content.replace(/\n/g,'
');
				var pattern = new RegExp(trigger+cc,'gi');
				evt.preventDefault(); // prevent the tab key from being added
				this.syntaxHighlight('snippets',pattern,content);
			}
		}
	},
	
	readOnly : function() {
		document.designMode = (arguments[0]) ? 'off' : 'on';
	},

	complete : function(trigger) {
		window.getSelection().getRangeAt(0).deleteContents();
		var complete = Language.complete;
		for (var i=0; i/g,'\n');
		code = code.replace(/\u2009/g,'');
		code = code.replace(/<.*?>/g,'');
		code = code.replace(/</g,'<');
		code = code.replace(/>/g,'>');
		code = code.replace(/&/gi,'&');
		return code;
	},

	// put code inside editor
	setCode : function() {
		var code = arguments[0];
		code = code.replace(/\u2009/gi,'');
		code = code.replace(/&/gi,'&');
       	code = code.replace(//g,'>');
		editor.innerHTML = code;
	},

	// undo and redo methods
	actions : {
		pos : -1, // actual history position
		history : [], // history vector
		
		undo : function() {
			if(editor.innerHTML.indexOf(cc)==-1){
				window.getSelection().getRangeAt(0).insertNode(document.createTextNode(cc));
			 	this.history[this.pos] = editor.innerHTML;
			}
			this.pos--;
			if(typeof(this.history[this.pos])=='undefined') this.pos++;
			editor.innerHTML = this.history[this.pos];
			CodePress.findString();
		},
		
		redo : function() {
			this.pos++;
			if(typeof(this.history[this.pos])=='undefined') this.pos--;
			editor.innerHTML = this.history[this.pos];
			CodePress.findString();
		},
		
		next : function() { // get next vector position and clean old ones
			if(this.pos>20) this.history[this.pos-21] = undefined;
			return ++this.pos;
		}
	}
}

Language={};
window.addEventListener('load', function() { CodePress.initialize('new'); }, true);