less.js

/** 
 * require.js
 * vim: et:ts=4:sw=4:sts=4
 * @license RequireJS 0.14.5 Copyright (c) 2010, The Dojo Foundation All Rights Reserved.
 * Available via the MIT or new BSD license.
 * see: http://github.com/jrburke/requirejs for details
 */
var require,define;(
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/**
 * Less
 *
 */
var Less = (function(){

    var req = function(scripts, onload){
        require(scripts, onload);
    };
    
    
    /**
     * The ContentLoader provides some method to manage ajax connections,
     *
     */
    var ContentLoader = function(){
        var _self = this;
        
        _self.curUrl = "";
        _self.method = "GET";
		_self.cached = true;
		
        var _handleTimeout = function(res){
            throw new Error("fetch response timeout, url:" + _self.curUrl);
        };
        
		this.handleFailure = function(){};
        
        this.parseResponse = function(res){
        };
        
        this.setProcressing = function(flag){
        };
        
        var _handleSuccess = function(res){
            _self.parseResponse(res);
            _self.setProcressing(false);
            _self.onLoad();
        };
        
        this.asyncRequest = function(method, url, callback){
        
        };
        
        var _getAsyncManager = function(){
            return {
                asyncRequest: _self.asyncRequest
            }
        };
        
        this.loadContent = function(module){
            _self.setProcressing(true);
            
            _self.curUrl = module.source;
            _self.container = module.target;
            
			var url = (_self.method == "GET" && module.queryData) ? 
						_self.curUrl + "?"+ (module.queryData + (_self.cached ? ("&r=" + Math.random()) : "") )
						: (_self.curUrl + (_self.cached ? ("?r=" + Math.random()) : ""));

            _getAsyncManager().asyncRequest(_self.method, url , {
                success: _handleSuccess,
                failure: this.handleFailure,
                timeout: 5000
            },_self.queryData);
        };
        
    };
	
    /**
     * merge properties of two objects
     * @param {Object} obj1
     * @param {Object} obj2
     */
    function merge(obj1, obj2){
        for (var p in obj2) {
            try {
                // Property in destination object set; update its value.
                if (obj2[p].constructor == Object) {
                    obj1[p] = MergeRecursive(obj1[p], obj2[p]);
                    
                }
                else {
                    obj1[p] = obj2[p];
                }
            } 
            catch (e) {
                // Property in destination object not set; create it and set its value.
                obj1[p] = obj2[p];
            }
        }
        return obj1;
    }
    
    
    /** 
     * @method _getHash
     * @return {string} The hash portion of the document's location
     * @private
     */
    var _getHash = function(){
        var i, href;
        href = top.location.href;
        i = href.indexOf("#");
        return i >= 0 ? href.substr(i + 1) : null;
    };
    
    var HistoryManager = (function(){
        var documentMode = document.documentMode,        
		/**
         * onStateChange will be called whenever hash changed
         *
         * @Method onStateChange
         * @type Function
         * @private
         */
        onStateChange = function(){
        },        
		/**
         * current location hash
         *
         * @property hash
         * @type string
         * @default ''
         * @private
         */
        hash,        
		/**
         * check whether the hash changed
         *
         * @Method checkStateChange
         * @type Function
         * @private
         */
        _checkStateChange = function(state){
            if (state != hash) {
                hash = state;
                onStateChange(hash);
            }
        },        /**
         * Flag used to tell whether History.init has been called.
         *
         * @property _initialized
         * @type boolean
         * @default false
         * @private
         */
        _initialized = false,        
		/**
         * hidden IFrame used to store the browsing history.
         *
         * @property _histFrame
         * @type HTMLIFrameElement
         * @default null
         * @private
         */
        _histFrame,        
		/**
         * Update the IFrame with new state.
         *
         * @method _updateIFrame
         * @private
         * @return {boolean} true if successful. throw an error otherwise.
         */
        _updateIFrame = function(newState){
            if (!newState) {
                return;
            }
            var html, doc;
            
            html = '<html><title>' +
            newState.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/"/g, "&quot;") +
            '</title><body></body></html>';
            
            try {
                doc = _histFrame.contentWindow.document;
                doc.open();
                doc.write(html);
                doc.close();
                return true;
            } 
            catch (e) {
                throw new Error("update _histFrame faliure(in IE7 and below), browser error :" + e.message);
            }
        },        
		/**
         * Used by Internet Explorer 7 and below to set up an iframe that keeps track of history changes
         * Periodically checks whether our internal IFrame is ready to be used of
         *
         * @method _setUpIframe
         * @private
         */
        _setUpIframe = function(){
       
            var doc, data;
            
            //Don't run until access to the iframe is allowed.
            try {
                doc = _histFrame.contentWindow.document;
            } 
            catch (e) {
                setTimeout(_setUpIframe, 10);
                return;
            }
            
            //Create a history entry for the initial state. 
            _updateIFrame(hash);
            data = hash;
            
            setInterval(function(){
                var currentData, currentHash;    
                try {
					currentData = _histFrame.contentWindow.document.title;	
                    if (currentData !== data) {
                        data = currentData;
                        _checkStateChange(data);
                        top.location.hash = hash = currentData;
                    }
                    else {
                        currentHash = _getHash();
                        if (currentHash != hash) {
							_updateIFrame(currentHash);
						}
                    }
                }catch (e) {
                    throw new Error("set up iframe error");
                }
            }, 50);
        };
        
        return {
            /**
             * Initializes the Browser History Manager. Call this method
             * from a script block located right after the opening body tag.
             *
             * @method init
             * @param {Object} config
             * 		config.histFrame : <input type="hidden"> used to store application states. Must be in the static markup.
             * 		config.onStateChange : callback for hash changing\
             * 		config.rotationTime : rotation time in sec
             * @public
             */
            init: function(config){
                config = config || {};
                
                if (_initialized) 
                    return;
                
                _initialized = true;
                onStateChange = config.onStateChange || onStateChange;
                
                //Keep track of the hash value.
                hash = _getHash();
                if (hash) {
                    onStateChange(hash);
                }
                
                //specific code for IE.
                if (window.ActiveXObject) {
                    if (!documentMode || documentMode < 8) {
                        // IE 5.5/6/7 need an iframe for history support.
                        _histFrame = document.getElementById(config.histFrame);
                        if (!_histFrame) {
                            throw new Error("can not find the hidden iframe[" + config.histFrame + "] in IE7 and below");
                        }
                        _setUpIframe();
                    }
                    else {
                        // IE 8 has onhashchange event.
                        window.attachEvent("onhashchange", function(){							
							_checkStateChange(_getHash());
						});
                    }
                }
                else {
                    // Change Opera navigation mode to improve history support.
                    if (history.navigationMode) 
                        history.navigationMode = "compatible";
                    
                    setInterval(function(){
						_checkStateChange(_getHash());	
					}, config.rotationTime || 500);
                }
                
                return this;
            },
            
            /**
             * Cancel if the new hash is the same as the current one, since there
             * is no cross-browser way to keep track of navigation to the exact
             * same hash multiple times in a row. A wrapper can handle this by
             * adding an incrementing counter to the end of the hash.
             * @param {string} newHash
             */
            go: function(newHash, flag){
                if (newHash == hash) 
                    return;
                if (_histFrame) {
                    _updateIFrame(newHash);
                }
                else {
                    location.hash = hash = newHash;
                    if (!flag) {
                        onStateChange(newHash);
                    }
                }
            },
			getState : function(){
				return _getHash();
			}
			
        };
    })();
    
    
    /**
     * Module  single module
     *
     * @param {String} name
     * @param {Object} args
     */
    var Module = function(name, args){
    
        this.name = name;
        
        this.queryData = "";
		
        this.onLoad = function(){
        
        };
        
        this.autoLoad = [];
        
        for (var x in args) {
            this[x] = args[x];
        }
        
        this.garbageCollection = function(){
			
		};
    };
    
    /**
     * 模块集合
     */
    var Modules = function(){
    
        var _self = this,        
		/**
         * modules's base infomation, for example: scriptPath, stylePath
         *
         * @property baseInfo
         * @type Object
         * @private
         */
        baseInfo,        
		/**
         * module entities
         *
         * @property entities
         * @type Array
         * @private
         */
        entities,        
		/**
         * module's count
         *
         * @property entities
         * @type Array
         * @private
         */
        count,        
		/**
         * import style files
         *
         * @param {Module} module
         */
        importStyle = function(module){
        
            var styles = module.styles;
            
            if (!styles) {
                return;
            }
            
            for (var i = styles.length; i--;) {
            
                var styleId = module.name + "-" + i;
                if (document.getElementById(styleId)) {
                    continue;
                }
                
                var styleEl = document.createElement("link");
                styleEl.id = styleId;
                styleEl.rel = "stylesheet";
                styleEl.href = styles[i];
                
                var wrapper = document.getElementsByTagName("head")[0] || document.body;
                wrapper.appendChild(styleEl);
            }
        },
		gc = function(){
			var que = _self.modulesQue;
			for(var x = que.length ; x--;){
				que[x].garbageCollection();
			}
		};
        
        
        /**
         *
         */
        this.modulesQue = [];
        
        /**
         * get a module form module queue by name
         *
         * @param {Object} name
         */
        this.get = function(name){
            var que = _self.modulesQue;
            for (var i = que.length; i--;) {
                if (que[i].name == name) {
                    return que[i];
                }
            }
            return null;
        };
        
        /**
         * add a module to the modules array
         * @param {Object} module
         */
        this.add = function(module){
            this.modulesQue.push(module);
        };
        
        
        /**
         * Prepare a file used to describe modules
         *
         * @param {Object} args
         */
        this.loadModuleMaps = function(args){
            var _self = this, moduleMaps = args.moduleMaps, onFinish = args.onFinish;
            
            req([moduleMaps], function(){
                if (typeof modules == "undefined" || !modules) {
                    throw new Error("no modules found. Check the module maps file");
                }
                
                baseInfo = modules.base, entities = modules.entities;
                count = entities.length;
                
                for (var x in entities) {
                    var entity = entities[x];
                    _self.add(new Module(x, entity));
                    
                    scripts = entity.scripts || [];
                    styles = entity.styles || [];
                    
                    for (var i = scripts.length; i--;) {
                        scripts[i] = scripts[i].indexOf("/")>=0 ? scripts[i] : baseInfo.scriptPath + scripts[i];
                    }
                    
                    for (var i = styles.length; i--;) {
                        styles[i] = baseInfo.cssPath + styles[i];
                    }
                }
                onFinish.call(_self);
            });
        };
        
        /**
         * remove a module from the modules array
         * @param {Object} module
         */
        this.remove = function(moduleName){
            var _self = this;
            _self.modules.sort(function(a, b){
                a = a.name === moduleName ? 2 : 1;
                b = b.name === moduleName ? 2 : 1;
                return a - b;
            });
            
            _self.modulesQue[_self.modulesQue.lenght - 1].garbageCollection();
            _self.modulesQue.pop();
        };
        
        this.setContentLoader = function(contentLoader){
            this.contentLoader = contentLoader;
        };
        
        this.getCrawlerAllowed = function(){
            return baseInfo.crawlerAllowed;
        };
        
        this.getModuleName = function(hash){
            if (!hash) 
                return "";
            return this.getCrawlerAllowed() ? hash.replace(/(\!)/g, "") : hash;
        }
        
        this.state = "";
        
        this.setState = function(state){
            this.state = state;
			_historyManager.go(state , false);
        }
        
        function isArray(a){
            return Object.prototype.toString.call(a) === '[object Array]';
        }
        
		this.dispatch = function(states){
			var name = isArray(states) ? states[0] : states;			
			if (name == this.state || typeof name == undefined || !name || typeof name != "string") {
                return;
            }
           
			var queryStr = name.split("?")[1]|| "";			
			name = name.split("?")[0];
			
            var moduleName = this.getModuleName(name);
            if (moduleName === ""){
				return;
			} 
			
            var moduleEntity = this.get(moduleName);
			
            if (moduleEntity == null) {
                return;
            }
            var _self = this;
            
            this.setState(name + (queryStr && !moduleEntity.stateless ? ( "?" + queryStr ): ""));
			
            if (moduleEntity.target) {
                this.contentLoader.onLoad = function(){
					gc();
                    req(moduleEntity.scripts, function(){
                        moduleEntity.onLoad();
                        
						if(isArray(states) && states[1]){
							states.shift();
							_self.dispatch(states);	
						}else{
							if (moduleEntity.autoLoad) {
								_self.dispatch(moduleEntity.autoLoad);
							}	
						}                       
                    });
                }
				
				moduleEntity.queryData = queryStr;
                this.contentLoader.loadContent(moduleEntity);
            }
            importStyle(moduleEntity);
			
		}		
		
        this.onStateChange = function(){
        };
		
        this.sniff = function(state){
            if (!state) {
                return;
            }
			
            if (_self.state == "") {
                var states = state.split("/"), statesTemp = [];
                for (var x = 0, y = states.length; x < y; x++) {
                    var result = "";
                    for (var z = 0; z <= x; z++) {
                        result = result + "/" + states[z];
                    }
                    if (result != "") {
                        statesTemp.push(result.substr(1));
                    }
                }
               	_self.dispatch(statesTemp);
                _self.onStateChange(statesTemp[0]);
            }
            else {
                _self.dispatch(state);
                _self.onStateChange(state);
            }
        };
    };
    Modules.getInstance = function(){
        if (Modules.instance == undefined) {
            Modules.instance = new Modules();
        }
        return Modules.instance;
    };
    
    
    
    var ModulesManager = (function(){
    
        var modules = Modules.getInstance(), procressing = false;
        
        return {
            getModules: function(){
                return modules;
            },
            init: function(args){
				
				if(!args || args === undefined){
					return this;
				}
				
                modules.setContentLoader(args.contentLoader);
                modules.loadModuleMaps(args);
                if (args.onStateChange) {
                    modules.onStateChange = args.onStateChange;
                }
                return this;
            },
            getStateName: function(state){
                return (modules.getCrawlerAllowed() ? "!" : "") + state
            },
            addModule: function(name, entity){
                var module = new Module(name, entity);
                if (entity.autoLoad) {
                    var que = modules.modulesQue;
                    for (var i = que.length; i--;) {
                        if (name.indexOf(que[i].name) >= 0) {
                            que[i].autoLoad.push(name);
                        }
                    }
                }
                modules.add(module);
            },
			modifyModule : function(moduleName ,type, target){
				var moduleEntity = modules.get(moduleName);
				if(moduleEntity === null){
					return false;
				}
				
				moduleEntity[type] = target;
			}
            
        };
    })();
    
    
    
    
    /**
     * @see HistoryManager._histFrame
     */
    var HISTFRAME = "hist-frame";
    
    /**
     * default hash  manager
     * @see historyManager.js
     * @type Object
     * @private
     */
    var _historyManager,    /**
     * default moudules manager
     * @type Object
     * @private
     */
    _modulesManager,    /**
     * Flag used to tell whether Less.init has been called.
     *
     * @property _initialized
     * @type boolean
     * @default false
     * @private
     */
    _initialized, _initialize = function(args, less){
        args = args || {};
        
        //get script loader		
        if (typeof req == "undefined") {
            _initialized = false;
            throw new Error("load scriptloader failure");
        }
        
        //get modules
        _modulesManager = args.modulesManager;
        
        args.onFinish = function(){
        
            _t = this;
            //get history manager 
            _historyManager = args.historyManager;
            
            _historyManager.init({
                onStateChange: _t.sniff,
                histFrame: args.histFrame || HISTFRAME
            });
            
           
            var hash = _getHash() || args.defaultModule;
            _historyManager.go(_modulesManager.getStateName(hash));
            if (args.onInit) {
                args.onInit.call(less);
            }
            
            _initialized = true;
        };
        
        _modulesManager.init(args);
        
        
    },    
	
    
	/**
	 * use jquery ajax connection manager as content loader
	 */
	jqueryLoader = {
		asyncRequest : function(method , url ,callback){
			$.ajax({		
				 url: url,
				 success : callback.success
			});
		},
		parseResponse : function(res){
			var _t = this;
			$("#" + _t.container).html(res);
		}
	},
	
	/**
     * some default setting for less
     *
     * @property _defaultArgs
     * @type Object
     * @private
     */
    _defaultArgs = {
        contentLoader: jqueryLoader,
        historyManager: HistoryManager,
        modulesManager: ModulesManager,
        histFrame: HISTFRAME
    };
    
    this.contentLoader = ContentLoader;
    
    return {
        /**
         * Finish up the initialization of 'Less'.
         *
         * @method init
         * @private
         */
        init: function(args){
            //less hash already been initialized
            if (_initialized) {
                return;
            }
            if (args.contentLoader) {
                var cl = new ContentLoader();
                cl = merge(cl, args.contentLoader);
                args.contentLoader = cl;
            }
            
            if (args.loadscript) {
                req = args.loadscript;
            }
            
            args = merge(_defaultArgs, args);
            _initialize(args, this);
            
            this.args = args;
            
            return this;
        },
        getState: function(){	
            return _historyManager.getState();
        },
        go: function(state){
            _historyManager.go(_modulesManager.getStateName(state));
			return this;
        },
        add: function(name, entity){
            _modulesManager.addModule(name, entity);
            return this;
        },
		onModuleLoad : function(moduleName , onload){
			_modulesManager.modifyModule(moduleName ,"onLoad", onload);
			return this;
		},
		GC : function(module , callback){
			_modulesManager.modifyModule(module , "garbageCollection" , callback);
		},
		require : function(scripts , callback){
			req(scripts,callback || function(){});
			return this;
		}
    };
    
})();