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/*
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 * CodePress - Real Time Syntax Highlighting Editor written in JavaScript - http://codepress.org/
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 *
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 * Copyright (C) 2007 Fernando M.A.d.S. <fermads@gmail.com>
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 *
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 * Contributors :
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 *
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 * 	Michael Hurni <michael.hurni@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify it under the terms of the
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 * GNU Lesser General Public License as published by the Free Software Foundation.
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 *
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 * Read the full licence: http://www.opensource.org/licenses/lgpl-license.php
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 */
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CodePress = {
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	scrolling : false,
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	autocomplete : true,
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	// set initial vars and start sh
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	initialize : function() {
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		if(typeof(editor)=='undefined' && !arguments[0]) return;
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		chars = '|32|46|62|'; // charcodes that trigger syntax highlighting
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		cc = '\u2009'; // control char
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		editor = document.getElementsByTagName('body')[0];
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		document.designMode = 'on';
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		document.addEventListener('keypress', this.keyHandler, true);
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		window.addEventListener('scroll', function() { if(!CodePress.scrolling) CodePress.syntaxHighlight('scroll') }, false);
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		completeChars = this.getCompleteChars();
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//		CodePress.syntaxHighlight('init');
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	},
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	// treat key bindings
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	keyHandler : function(evt) {
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    	keyCode = evt.keyCode;
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		charCode = evt.charCode;
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		if((evt.ctrlKey || evt.metaKey) && evt.shiftKey && charCode!=90)  { // shortcuts = ctrl||appleKey+shift+key!=z(undo)
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			CodePress.shortcuts(charCode?charCode:keyCode);
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		}
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		else if(completeChars.indexOf('|'+String.fromCharCode(charCode)+'|')!=-1 && CodePress.autocomplete) { // auto complete
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			CodePress.complete(String.fromCharCode(charCode));
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		}
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	    else if(chars.indexOf('|'+charCode+'|')!=-1||keyCode==13) { // syntax highlighting
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		 	CodePress.syntaxHighlight('generic');
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		}
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		else if(keyCode==9 || evt.tabKey) {  // snippets activation (tab)
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			CodePress.snippets(evt);
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		}
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		else if(keyCode==46||keyCode==8) { // save to history when delete or backspace pressed
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		 	CodePress.actions.history[CodePress.actions.next()] = editor.innerHTML;
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		}
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		else if((charCode==122||charCode==121||charCode==90) && evt.ctrlKey) { // undo and redo
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			(charCode==121||evt.shiftKey) ? CodePress.actions.redo() :  CodePress.actions.undo();
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			evt.preventDefault();
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		}
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		else if(keyCode==86 && evt.ctrlKey)  { // paste
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			// TODO: pasted text should be parsed and highlighted
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		}
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	},
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	// put cursor back to its original position after every parsing
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	findString : function() {
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		if(self.find(cc))
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			window.getSelection().getRangeAt(0).deleteContents();
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	},
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	// split big files, highlighting parts of it
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	split : function(code,flag) {
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		if(flag=='scroll') {
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			this.scrolling = true;
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			return code;
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		}
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		else {
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			this.scrolling = false;
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			mid = code.indexOf(cc);
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			if(mid-2000<0) {ini=0;end=4000;}
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			else if(mid+2000>code.length) {ini=code.length-4000;end=code.length;}
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			else {ini=mid-2000;end=mid+2000;}
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			code = code.substring(ini,end);
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			return code;
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		}
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	},
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	// syntax highlighting parser
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	syntaxHighlight : function(flag) {
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		//if(document.designMode=='off') document.designMode='on'
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		if(flag!='init') window.getSelection().getRangeAt(0).insertNode(document.createTextNode(cc));
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		o = editor.innerHTML;
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		o = o.replace(/<br>/g,'\n');
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		o = o.replace(/<.*?>/g,'');
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		x = z = this.split(o,flag);
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		x = x.replace(/\n/g,'<br>');
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		if(arguments[1]&&arguments[2]) x = x.replace(arguments[1],arguments[2]);
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		for(i=0;i<Language.syntax.length;i++)
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			x = x.replace(Language.syntax[i].input,Language.syntax[i].output);
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		editor.innerHTML = this.actions.history[this.actions.next()] = (flag=='scroll') ? x : o.split(z).join(x);
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		if(flag!='init') this.findString();
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	},
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	getLastWord : function() {
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		var rangeAndCaret = CodePress.getRangeAndCaret();
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		var words = rangeAndCaret[0].substring(rangeAndCaret[1]-40,rangeAndCaret[1]).split(/[\s\r\n\);]/);
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		return words[words.length-1].replace(/_/g,'');
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	},
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	snippets : function(evt) {
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		var snippets = Language.snippets;
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		var trigger = this.getLastWord();
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		for (var i=0; i<snippets.length; i++) {
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			if(snippets[i].input == trigger) {
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				var content = snippets[i].output.replace(/</g,'&lt;');
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				content = content.replace(/>/g,'&gt;');
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				if(content.indexOf('$0')<0) content += cc;
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				else content = content.replace(/\$0/,cc);
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				content = content.replace(/\n/g,'<br>');
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				var pattern = new RegExp(trigger+cc,'g');
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				evt.preventDefault(); // prevent the tab key from being added
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				this.syntaxHighlight('snippets',pattern,content);
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			}
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		}
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	},
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	readOnly : function() {
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		document.designMode = (arguments[0]) ? 'off' : 'on';
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	},
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	complete : function(trigger) {
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		window.getSelection().getRangeAt(0).deleteContents();
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		var complete = Language.complete;
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		for (var i=0; i<complete.length; i++) {
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			if(complete[i].input == trigger) {
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				var pattern = new RegExp('\\'+trigger+cc);
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				var content = complete[i].output.replace(/\$0/g,cc);
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				parent.setTimeout(function () { CodePress.syntaxHighlight('complete',pattern,content)},0); // wait for char to appear on screen
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			}
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		}
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	},
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	getCompleteChars : function() {
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		var cChars = '';
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		for(var i=0;i<Language.complete.length;i++)
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			cChars += '|'+Language.complete[i].input;
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		return cChars+'|';
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	},
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	shortcuts : function() {
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		var cCode = arguments[0];
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		if(cCode==13) cCode = '[enter]';
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		else if(cCode==32) cCode = '[space]';
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		else cCode = '['+String.fromCharCode(charCode).toLowerCase()+']';
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		for(var i=0;i<Language.shortcuts.length;i++)
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			if(Language.shortcuts[i].input == cCode)
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				this.insertCode(Language.shortcuts[i].output,false);
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	},
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	getRangeAndCaret : function() {
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		var range = window.getSelection().getRangeAt(0);
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		var range2 = range.cloneRange();
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		var node = range.endContainer;
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		var caret = range.endOffset;
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		range2.selectNode(node);
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		return [range2.toString(),caret];
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	},
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	insertCode : function(code,replaceCursorBefore) {
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		var range = window.getSelection().getRangeAt(0);
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		var node = window.document.createTextNode(code);
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		var selct = window.getSelection();
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		var range2 = range.cloneRange();
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		// Insert text at cursor position
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		selct.removeAllRanges();
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		range.deleteContents();
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		range.insertNode(node);
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		// Move the cursor to the end of text
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		range2.selectNode(node);
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		range2.collapse(replaceCursorBefore);
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		selct.removeAllRanges();
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		selct.addRange(range2);
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	},
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	// get code from editor
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	getCode : function() {
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		var code = editor.innerHTML;
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		code = code.replace(/<br>/g,'\n');
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		code = code.replace(/\u2009/g,'');
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		code = code.replace(/<.*?>/g,'');
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		code = code.replace(/&lt;/g,'<');
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		code = code.replace(/&gt;/g,'>');
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		code = code.replace(/&amp;/gi,'&');
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		return code;
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	},
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	// put code inside editor
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	setCode : function() {
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		var code = arguments[0];
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		code = code.replace(/\u2009/gi,'');
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		code = code.replace(/&/gi,'&amp;');
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       	code = code.replace(/</g,'&lt;');
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        code = code.replace(/>/g,'&gt;');
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		editor.innerHTML = code;
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	},
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	// undo and redo methods
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	actions : {
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		pos : -1, // actual history position
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		history : [], // history vector
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		undo : function() {
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			if(editor.innerHTML.indexOf(cc)==-1){
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				window.getSelection().getRangeAt(0).insertNode(document.createTextNode(cc));
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			 	this.history[this.pos] = editor.innerHTML;
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			}
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			this.pos--;
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			if(typeof(this.history[this.pos])=='undefined') this.pos++;
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			editor.innerHTML = this.history[this.pos];
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			CodePress.findString();
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		},
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		redo : function() {
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			this.pos++;
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			if(typeof(this.history[this.pos])=='undefined') this.pos--;
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			editor.innerHTML = this.history[this.pos];
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			CodePress.findString();
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		},
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		next : function() { // get next vector position and clean old ones
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			if(this.pos>20) this.history[this.pos-21] = undefined;
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			return ++this.pos;
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		}
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	}
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}
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Language={};
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window.addEventListener('load', function() { CodePress.initialize('new'); }, true);