/*

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

 * 

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

 *

 * Developers:

 *		Fernando M.A.d.S. <fermads@gmail.com>

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

 * Contributors: 	

 *		Martin D. Kirk

 *

 * 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'; // carret char

		editor = document.getElementsByTagName('pre')[0];

		editor.contentEditable = 'true';

		document.getElementsByTagName('body')[0].onfocus = function() {editor.focus();}

		document.attachEvent('onkeydown', this.metaHandler);

		document.attachEvent('onkeypress', this.keyHandler);

		window.attachEvent('onscroll', function() { if(!CodePress.scrolling) setTimeout(function(){CodePress.syntaxHighlight('scroll')},1)});

		completeChars = this.getCompleteChars();

		completeEndingChars =  this.getCompleteEndingChars();

		setTimeout(function() { window.scroll(0,0) },50); // scroll IE to top

	},

	// treat key bindings

	keyHandler : function(evt) {

		charCode = evt.keyCode;

		fromChar = String.fromCharCode(charCode);

		if( (completeEndingChars.indexOf('|'+fromChar+'|')!= -1 || completeChars.indexOf('|'+fromChar+'|')!=-1  )&& CodePress.autocomplete) { // auto complete

			if(!CodePress.completeEnding(fromChar))

			     CodePress.complete(fromChar);

		}

	    else if(chars.indexOf('|'+charCode+'|')!=-1||charCode==13) { // syntax highlighting

		 	CodePress.syntaxHighlight('generic');

		}

	},

	metaHandler : function(evt) {

		keyCode = evt.keyCode;

		if(keyCode==9 || evt.tabKey) { 

			CodePress.snippets();

		}

		else if((keyCode==122||keyCode==121||keyCode==90) && evt.ctrlKey) { // undo and redo

			(keyCode==121||evt.shiftKey) ? CodePress.actions.redo() :  CodePress.actions.undo(); 

			evt.returnValue = false;

		}

		else if(keyCode==34||keyCode==33) { // handle page up/down for IE

			self.scrollBy(0, (keyCode==34) ? 200 : -200); 

			evt.returnValue = false;

		}

		else if(keyCode==46||keyCode==8) { // save to history when delete or backspace pressed

		 	CodePress.actions.history[CodePress.actions.next()] = editor.innerHTML;

		}

		else if((evt.ctrlKey || evt.metaKey) && evt.shiftKey && keyCode!=90)  { // shortcuts = ctrl||appleKey+shift+key!=z(undo) 

			CodePress.shortcuts(keyCode);

			evt.returnValue = false;

		}

		else if(keyCode==86 && evt.ctrlKey)  { // handle paste

			window.clipboardData.setData('Text',window.clipboardData.getData('Text').replace(/\t/g,'\u2008'));

		 	top.setTimeout(function(){CodePress.syntaxHighlight('paste');},10);

		}

		else if(keyCode==67 && evt.ctrlKey)  { // handle cut

			// window.clipboardData.setData('Text',x[0]);

			// code = window.clipboardData.getData('Text');

		}

	},

	// put cursor back to its original position after every parsing

	findString : function() {

		range = self.document.body.createTextRange();

		if(range.findText(cc)){

			range.select();

			range.text = '';

		}

	},

	// 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(cc);

			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.substring(code.indexOf('<P>'),code.lastIndexOf('</P>')+4);

		}

	},

	// syntax highlighting parser

	syntaxHighlight : function(flag) {

		if(flag!='init') document.selection.createRange().text = cc;

		o = editor.innerHTML;

		if(flag=='paste') { // fix pasted text

			o = o.replace(/<BR>/g,'\r\n'); 

			o = o.replace(/\u2008/g,'\t');

		}

		o = o.replace(/<P>/g,'\n');

		o = o.replace(/<\/P>/g,'\r');

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

		o = o.replace(/ /g,'');			

		o = '<PRE><P>'+o+'</P></PRE>';

		o = o.replace(/\n\r/g,'<P></P>');

		o = o.replace(/\n/g,'<P>');

		o = o.replace(/\r/g,'<\/P>');

		o = o.replace(/<P>(<P>)+/,'<P>');

		o = o.replace(/<\/P>(<\/P>)+/,'</P>');

		o = o.replace(/<P><\/P>/g,'<P><BR/></P>');

		x = z = this.split(o,flag);

		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.replace(z,x);

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

	},

	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,'</P><P>');

				var pattern = new RegExp(trigger+cc,"gi");

				this.syntaxHighlight('snippets',pattern,content);

			}

		}

	},

	readOnly : function() {

		editor.contentEditable = (arguments[0]) ? 'false' : 'true';

	},

	complete : function(trigger) {

		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);

				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+'|';

	},

	getCompleteEndingChars : function() {

		var cChars = '';

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

			cChars += '|'+Language.complete[i].output.charAt(Language.complete[i].output.length-1);

		return cChars+'|';

	},

	completeEnding : function(trigger) {

		var range = document.selection.createRange();

		try {

			range.moveEnd('character', 1)

		}

		catch(e) {

			return false;

		}

		var next_character = range.text

		range.moveEnd('character', -1)

		if(next_character != trigger )  return false;

		else {

			range.moveEnd('character', 1)

			range.text=''

			return true;

		}

	},	

	shortcuts : function() {

		var cCode = arguments[0];

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

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

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

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

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

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

	},

	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();

	}, 

	getRangeAndCaret : function() {	

		var range = document.selection.createRange();

		var caret = Math.abs(range.moveStart('character', -1000000)+1);

		range = this.getCode();

		range = range.replace(/\n\r/gi,'  ');

		range = range.replace(/\n/gi,'');

		return [range.toString(),caret];

	},

	insertCode : function(code,replaceCursorBefore) {

		var repdeb = '';

		var repfin = '';

		if(replaceCursorBefore) { repfin = code; }

		else { repdeb = code; }

		if(typeof document.selection != 'undefined') {

			var range = document.selection.createRange();

			range.text = repdeb + repfin;

			range = document.selection.createRange();

			range.move('character', -repfin.length);

			range.select();	

		}	

	},

	// get code from editor	

	getCode : function() {

		var code = editor.innerHTML;

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

		code = code.replace(/<\/p>/gi,'\r');

		code = code.replace(/<p>/i,''); // IE first line fix

		code = code.replace(/<p>/gi,'\n');

		code = code.replace(/ /gi,'');

		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 = '<pre>'+code+'</pre>';

	},

	// undo and redo methods

	actions : {

		pos : -1, // actual history position

		history : [], // history vector

		undo : function() {

			if(editor.innerHTML.indexOf(cc)==-1){

				document.selection.createRange().text = 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={};