replace callback support for safari (See related posts)

   1  
   2  // replace callback support for safari.
   3  (function(){
   4    var default_replace = String.prototype.replace;
   5    String.prototype.replace = function(search,replace){
   6  	// replace is not function
   7  	if(typeof replace != "function"){
   8  		return default_replace.apply(this,arguments)
   9  	}
  10  	var str = "" + this;
  11  	var callback = replace;
  12  	// search string is not RegExp
  13  	if(!(search instanceof RegExp)){
  14  		var idx = str.indexOf(search);
  15  		return (
  16  			idx == -1 ? str :
  17  			default_replace.apply(str,[search,callback(search, idx, str)])
  18  		)
  19  	}
  20  	var reg = search;
  21  	var result = [];
  22  	var lastidx = reg.lastIndex;
  23  	var re;
  24  	while((re = reg.exec(str)) != null){
  25  		var idx  = re.index;
  26  		var args = re.concat(idx, str);
  27  		result.push(
  28  			str.slice(lastidx,idx),
  29  			callback.apply(null,args).toString()
  30  		);
  31  		if(!reg.global){
  32  			lastidx += RegExp.lastMatch.length;
  33  			break
  34  		}else{
  35  			lastidx = reg.lastIndex;
  36  		}
  37  	}
  38  	result.push(str.slice(lastidx));
  39  	return result.join("")
  40    }
  41  })();