/*	Copyright (c) 2004-2006, The Dojo Foundation	All Rights Reserved.	Licensed under the Academic Free License version 2.1 or above OR the	modified BSD license. For more information on Dojo licensing, see:		http://dojotoolkit.org/community/licensing.shtml*/dojo.provide("dojo.string.Builder");dojo.require("dojo.string");// NOTE: testing shows that direct "+=" concatenation is *much* faster on// Spidermoneky and Rhino, while arr.push()/arr.join() style concatenation is// significantly quicker on IE (Jscript/wsh/etc.).dojo.string.Builder = function(str){	this.arrConcat = (dojo.render.html.capable && dojo.render.html["ie"]);	var a = [];	var b = str || "";	var length = this.length = b.length;	if(this.arrConcat){		if(b.length > 0){			a.push(b);		}		b = "";	}	this.toString = this.valueOf = function(){ 		return (this.arrConcat) ? a.join("") : b;	};	this.append = function(s){		if(this.arrConcat){			a.push(s);		}else{			b+=s;		}		length += s.length;		this.length = length;		return this;	};	this.clear = function(){		a = [];		b = "";		length = this.length = 0;		return this;	};	this.remove = function(f,l){		var s = ""; 		if(this.arrConcat){			b = a.join(""); 		}		a=[];		if(f>0){			s = b.substring(0, (f-1));		}		b = s + b.substring(f + l); 		length = this.length = b.length; 		if(this.arrConcat){			a.push(b);			b="";		}		return this;	};	this.replace = function(o,n){		if(this.arrConcat){			b = a.join(""); 		}		a = []; 		b = b.replace(o,n); 		length = this.length = b.length; 		if(this.arrConcat){			a.push(b);			b="";		}		return this;	};	this.insert = function(idx,s){		if(this.arrConcat){			b = a.join(""); 		}		a=[];		if(idx == 0){			b = s + b;		}else{			var t = b.split("");			t.splice(idx,0,s);			b = t.join("")		}		length = this.length = b.length; 		if(this.arrConcat){			a.push(b); 			b="";		}		return this;	};};