/*

 * CodePress - Real Time Syntax Highlighting Editor written in JavaScript - http://codepress.org/

 * 

 * Copyright (C) 2007 Fernando M.A.d.S. <fermads@gmail.com>

 *

 * Contributors :

 *

 * 	Michael Hurni <michael.hurni@gmail.com>

 *

 * 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('<SPAN>');

			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(/<br>/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,'<br>');

		x = x.replace(/\t/g, '        ');

		if(arguments[1]&&arguments[2]) x = x.replace(arguments[1],arguments[2]);

		for(i=0;i<Language.syntax.length;i++) 

			x = x.replace(Language.syntax[i].input,Language.syntax[i].output);

		editor.innerHTML = this.actions.history[this.actions.next()] = (flag=='scroll') ? x : o.split(z).join(x); 

		if(flag!='init') this.findString();

	},

	getLastWord : function() {

		var rangeAndCaret = CodePress.getRangeAndCaret();

		words = rangeAndCaret[0].substring(rangeAndCaret[1]-40,rangeAndCaret[1]);

		words = words.replace(/[\s\n\r\);\W]/g,'\n').split('\n');

		return words[words.length-1].replace(/[\W]/gi,'').toLowerCase();

	}, 

	snippets : function(evt) {

		var snippets = Language.snippets;	

		var trigger = this.getLastWord();

		for (var i=0; i<snippets.length; i++) {

			if(snippets[i].input == trigger) {

				var content = snippets[i].output.replace(/</g,'&lt;');

				content = content.replace(/>/g,'>');

				if(content.indexOf('$0')<0) content += cc;

				else content = content.replace(/\$0/,cc);

				content = content.replace(/\n/g,'<br>');

				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<complete.length; i++) {

			if(complete[i].input == trigger) {

				var pattern = new RegExp('\\'+trigger+cc);

				var content = complete[i].output.replace(/\$0/g,cc);

				parent.setTimeout(function () { CodePress.syntaxHighlight('complete',pattern,content)},0); // wait for char to appear on screen

			}

		}

	},

	getCompleteChars : function() {

		var cChars = '';

		for(var i=0;i<Language.complete.length;i++)

			cChars += '|'+Language.complete[i].input;

		return cChars+'|';

	},

	shortcuts : function() {

		var cCode = arguments[0];

		if(cCode==13) cCode = '[enter]';

		else if(cCode==32) cCode = '[space]';

		else cCode = '['+String.fromCharCode(charCode).toLowerCase()+']';

		for(var i=0;i<Language.shortcuts.length;i++)

			if(Language.shortcuts[i].input == cCode)

				this.insertCode(Language.shortcuts[i].output,false);

	},

	getRangeAndCaret : function() {	

		var range = window.getSelection().getRangeAt(0);

		var range2 = range.cloneRange();

		var node = range.endContainer;			

		var caret = range.endOffset;

		range2.selectNode(node);	

		return [range2.toString(),caret];

	},

	insertCode : function(code,replaceCursorBefore) {

		var range = window.getSelection().getRangeAt(0);

		var node = window.document.createTextNode(code);

		var selct = window.getSelection();

		var range2 = range.cloneRange();

		// Insert text at cursor position

		selct.removeAllRanges();

		range.deleteContents();

		range.insertNode(node);

		// Move the cursor to the end of text

		range2.selectNode(node);		

		range2.collapse(replaceCursorBefore);

		selct.removeAllRanges();

		selct.addRange(range2);

	},

	// get code from editor

	getCode : function() {

		var code = editor.innerHTML;

		code = code.replace(/<br>/g,'\n');

		code = code.replace(/\u2009/g,'');

		code = code.replace(/<.*?>/g,'');

		code = code.replace(/&lt;/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,'&lt;');

        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);