add runtime version of has plugin

Author: clmath

has.js

@@ -0,0 +1,80 @@
+define(["module"], function(module){
+	var cache = (module.config && module.config()) || {};
+	
+	function resolve(resource, has, isBuild) {
+		var tokens = resource.match(/[\?:]|[^:\?]+/g);
+		var i = 0;
+		console.log(resource)
+		get = function(skip){
+			var term = tokens[i++];
+			if(term === ":"){
+				// empty string module name; therefore, no dependency
+				return "";
+			}else{
+				// postfixed with a ? means it is a feature to branch on, the term is the name of the feature
+				if(tokens[i++] === "?"){
+					var hasResult = has(term);
+					if(hasResult === undefined && isBuild){
+						return undefined;
+					}else if(!skip && hasResult){
+						// matched the feature, get the first value from the options
+						return get();
+					}else{
+						// did not match, get the second value, passing over the first
+						get(true);
+						return get(skip);
+					}
+				}
+				// a module
+				return term;
+			}
+		}
+		return get();
+	}
+	
+	var has = function(name){
+		var global = (function (){
+			return this; 
+		})();
+		
+		return typeof cache[name] === "function" ? (cache[name] = cache[name](global)) : cache[name]; // Boolean
+	};
+
+	has.cache = cache;
+
+	has.add = function(name, test, now, force){
+		(typeof cache[name] === "undefined" || force) && (cache[name] = test);
+		return now && has(name);
+	};
+	
+	has.normalize = function(resource, normalize){
+		var tokens = resource.match(/[\?:]|[^:\?]+/g);
+		
+		for (var i = 0; i < tokens.length; i++) {
+			if (tokens[i] !== ":" && tokens[i] !== "?" && tokens[i+1] !== "?") {
+				tokens[i] = normalize(tokens[i]);
+			}
+		}
+		
+		return tokens.join("");
+	};
+
+	has.load = function(resource, req, onLoad, config){
+		config = config || {};
+		
+		if (!resource || config.isBuild) {
+			onLoad();
+			return;
+		}
+		
+		var mid = resolve(resource, has, config.isBuild);
+		
+		if(mid){
+			req([mid], onLoad);
+		}else{
+			onLoad();
+		}
+	};
+
+	return has;
+});