From a089699c8915636ba4f158d77dba9b012bc93208 Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <fox@madoka.volgo-balt.ru>
Date: Fri, 4 Mar 2011 19:02:28 +0300
Subject: build custom layer of Dojo to speed up loading of tt-rss (refs #293)

---
 lib/dojo/back.js | 648 ++++++++++++++++++++++++++++++++++---------------------
 1 file changed, 400 insertions(+), 248 deletions(-)

(limited to 'lib/dojo/back.js')

diff --git a/lib/dojo/back.js b/lib/dojo/back.js
index a26562872..5e2998c97 100644
--- a/lib/dojo/back.js
+++ b/lib/dojo/back.js
@@ -5,254 +5,406 @@
 */
 
 
-if(!dojo._hasResource["dojo.back"]){
-dojo._hasResource["dojo.back"]=true;
+if(!dojo._hasResource["dojo.back"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
+dojo._hasResource["dojo.back"] = true;
 dojo.provide("dojo.back");
-(function(){
-var _1=dojo.back;
-function _2(){
-var h=window.location.hash;
-if(h.charAt(0)=="#"){
-h=h.substring(1);
-}
-return dojo.isMozilla?h:decodeURIComponent(h);
-};
-function _3(h){
-if(!h){
-h="";
-}
-window.location.hash=encodeURIComponent(h);
-_4=history.length;
-};
-if(dojo.exists("tests.back-hash")){
-_1.getHash=_2;
-_1.setHash=_3;
-}
-var _5=(typeof (window)!=="undefined")?window.location.href:"";
-var _6=(typeof (window)!=="undefined")?_2():"";
-var _7=null;
-var _8=null;
-var _9=null;
-var _a=null;
-var _b=[];
-var _c=[];
-var _d=false;
-var _e=false;
-var _4;
-function _f(){
-var _10=_c.pop();
-if(!_10){
-return;
-}
-var _11=_c[_c.length-1];
-if(!_11&&_c.length==0){
-_11=_7;
-}
-if(_11){
-if(_11.kwArgs["back"]){
-_11.kwArgs["back"]();
-}else{
-if(_11.kwArgs["backButton"]){
-_11.kwArgs["backButton"]();
-}else{
-if(_11.kwArgs["handle"]){
-_11.kwArgs.handle("back");
-}
-}
-}
-}
-_b.push(_10);
-};
-_1.goBack=_f;
-function _12(){
-var _13=_b.pop();
-if(!_13){
-return;
-}
-if(_13.kwArgs["forward"]){
-_13.kwArgs.forward();
-}else{
-if(_13.kwArgs["forwardButton"]){
-_13.kwArgs.forwardButton();
-}else{
-if(_13.kwArgs["handle"]){
-_13.kwArgs.handle("forward");
-}
-}
-}
-_c.push(_13);
-};
-_1.goForward=_12;
-function _14(url,_15,_16){
-return {"url":url,"kwArgs":_15,"urlHash":_16};
-};
-function _17(url){
-var _18=url.split("?");
-if(_18.length<2){
-return null;
-}else{
-return _18[1];
-}
-};
-function _19(){
-var url=(dojo.config["dojoIframeHistoryUrl"]||dojo.moduleUrl("dojo","resources/iframe_history.html"))+"?"+(new Date()).getTime();
-_d=true;
-if(_a){
-dojo.isWebKit?_a.location=url:window.frames[_a.name].location=url;
-}else{
-}
-return url;
-};
-function _1a(){
-if(!_e){
-var hsl=_c.length;
-var _1b=_2();
-if((_1b===_6||window.location.href==_5)&&(hsl==1)){
-_f();
-return;
-}
-if(_b.length>0){
-if(_b[_b.length-1].urlHash===_1b){
-_12();
-return;
-}
-}
-if((hsl>=2)&&(_c[hsl-2])){
-if(_c[hsl-2].urlHash===_1b){
-_f();
-return;
-}
-}
-if(dojo.isSafari&&dojo.isSafari<3){
-var _1c=history.length;
-if(_1c>_4){
-_12();
-}else{
-if(_1c<_4){
-_f();
-}
-}
-_4=_1c;
-}
-}
-};
-_1.init=function(){
-if(dojo.byId("dj_history")){
-return;
-}
-var src=dojo.config["dojoIframeHistoryUrl"]||dojo.moduleUrl("dojo","resources/iframe_history.html");
-if(dojo._postLoad){
-console.error("dojo.back.init() must be called before the DOM has loaded. "+"If using xdomain loading or djConfig.debugAtAllCosts, include dojo.back "+"in a build layer.");
-}else{
-document.write("<iframe style=\"border:0;width:1px;height:1px;position:absolute;visibility:hidden;bottom:0;right:0;\" name=\"dj_history\" id=\"dj_history\" src=\""+src+"\"></iframe>");
-}
-};
-_1.setInitialState=function(_1d){
-_7=_14(_5,_1d,_6);
-};
-_1.addToHistory=function(_1e){
-_b=[];
-var _1f=null;
-var url=null;
-if(!_a){
-if(dojo.config["useXDomain"]&&!dojo.config["dojoIframeHistoryUrl"]){
-console.warn("dojo.back: When using cross-domain Dojo builds,"+" please save iframe_history.html to your domain and set djConfig.dojoIframeHistoryUrl"+" to the path on your domain to iframe_history.html");
-}
-_a=window.frames["dj_history"];
-}
-if(!_9){
-_9=dojo.create("a",{style:{display:"none"}},dojo.body());
-}
-if(_1e["changeUrl"]){
-_1f=""+((_1e["changeUrl"]!==true)?_1e["changeUrl"]:(new Date()).getTime());
-if(_c.length==0&&_7.urlHash==_1f){
-_7=_14(url,_1e,_1f);
-return;
-}else{
-if(_c.length>0&&_c[_c.length-1].urlHash==_1f){
-_c[_c.length-1]=_14(url,_1e,_1f);
-return;
-}
-}
-_e=true;
-setTimeout(function(){
-_3(_1f);
-_e=false;
-},1);
-_9.href=_1f;
-if(dojo.isIE){
-url=_19();
-var _20=_1e["back"]||_1e["backButton"]||_1e["handle"];
-var tcb=function(_21){
-if(_2()!=""){
-setTimeout(function(){
-_3(_1f);
-},1);
-}
-_20.apply(this,[_21]);
-};
-if(_1e["back"]){
-_1e.back=tcb;
-}else{
-if(_1e["backButton"]){
-_1e.backButton=tcb;
-}else{
-if(_1e["handle"]){
-_1e.handle=tcb;
-}
-}
-}
-var _22=_1e["forward"]||_1e["forwardButton"]||_1e["handle"];
-var tfw=function(_23){
-if(_2()!=""){
-_3(_1f);
-}
-if(_22){
-_22.apply(this,[_23]);
-}
-};
-if(_1e["forward"]){
-_1e.forward=tfw;
-}else{
-if(_1e["forwardButton"]){
-_1e.forwardButton=tfw;
-}else{
-if(_1e["handle"]){
-_1e.handle=tfw;
-}
-}
-}
-}else{
-if(!dojo.isIE){
-if(!_8){
-_8=setInterval(_1a,200);
-}
-}
-}
-}else{
-url=_19();
-}
-_c.push(_14(url,_1e,_1f));
-};
-_1._iframeLoaded=function(evt,_24){
-var _25=_17(_24.href);
-if(_25==null){
-if(_c.length==1){
-_f();
-}
-return;
-}
-if(_d){
-_d=false;
-return;
-}
-if(_c.length>=2&&_25==_17(_c[_c.length-2].url)){
-_f();
-}else{
-if(_b.length>0&&_25==_17(_b[_b.length-1].url)){
-_12();
-}
+
+/*=====
+dojo.back = {
+	// summary: Browser history management resources
 }
-};
-})();
+=====*/
+
+
+(function(){ 
+	var back = dojo.back;
+
+	// everyone deals with encoding the hash slightly differently
+
+	function getHash(){ 
+		var h = window.location.hash;
+		if(h.charAt(0) == "#"){ h = h.substring(1); }
+		return dojo.isMozilla ? h : decodeURIComponent(h); 
+	}
+	
+	function setHash(h){
+		if(!h){ h = ""; }
+		window.location.hash = encodeURIComponent(h);
+		historyCounter = history.length;
+	}
+	
+	// if we're in the test for these methods, expose them on dojo.back. ok'd with alex.
+	if(dojo.exists("tests.back-hash")){
+		back.getHash = getHash;
+		back.setHash = setHash;		
+	}
+	
+	var initialHref = (typeof(window) !== "undefined") ? window.location.href : "";
+	var initialHash = (typeof(window) !== "undefined") ? getHash() : "";
+	var initialState = null;
+
+	var locationTimer = null;
+	var bookmarkAnchor = null;
+	var historyIframe = null;
+	var forwardStack = [];
+	var historyStack = [];
+	var moveForward = false;
+	var changingUrl = false;
+	var historyCounter;
+
+	function handleBackButton(){
+		//summary: private method. Do not call this directly.
+
+		//The "current" page is always at the top of the history stack.
+		var current = historyStack.pop();
+		if(!current){ return; }
+		var last = historyStack[historyStack.length-1];
+		if(!last && historyStack.length == 0){
+			last = initialState;
+		}
+		if(last){
+			if(last.kwArgs["back"]){
+				last.kwArgs["back"]();
+			}else if(last.kwArgs["backButton"]){
+				last.kwArgs["backButton"]();
+			}else if(last.kwArgs["handle"]){
+				last.kwArgs.handle("back");
+			}
+		}
+		forwardStack.push(current);
+	}
+
+	back.goBack = handleBackButton;
+
+	function handleForwardButton(){
+		//summary: private method. Do not call this directly.
+		var last = forwardStack.pop();
+		if(!last){ return; }
+		if(last.kwArgs["forward"]){
+			last.kwArgs.forward();
+		}else if(last.kwArgs["forwardButton"]){
+			last.kwArgs.forwardButton();
+		}else if(last.kwArgs["handle"]){
+			last.kwArgs.handle("forward");
+		}
+		historyStack.push(last);
+	}
+
+	back.goForward = handleForwardButton;
+
+	function createState(url, args, hash){
+		//summary: private method. Do not call this directly.
+		return {"url": url, "kwArgs": args, "urlHash": hash};	//Object
+	}
+
+	function getUrlQuery(url){
+		//summary: private method. Do not call this directly.
+		var segments = url.split("?");
+		if(segments.length < 2){
+			return null; //null
+		}
+		else{
+			return segments[1]; //String
+		}
+	}
+	
+	function loadIframeHistory(){
+		//summary: private method. Do not call this directly.
+		var url = (dojo.config["dojoIframeHistoryUrl"] || dojo.moduleUrl("dojo", "resources/iframe_history.html")) + "?" + (new Date()).getTime();
+		moveForward = true;
+        if(historyIframe){
+		    dojo.isWebKit ? historyIframe.location = url : window.frames[historyIframe.name].location = url;
+        }else{
+            //console.warn("dojo.back: Not initialised. You need to call dojo.back.init() from a <script> block that lives inside the <body> tag.");
+        }
+		return url; //String
+	}
+
+	function checkLocation(){
+		if(!changingUrl){
+			var hsl = historyStack.length;
+			
+			var hash = getHash();
+
+			if((hash === initialHash||window.location.href == initialHref)&&(hsl == 1)){
+				// FIXME: could this ever be a forward button?
+				// we can't clear it because we still need to check for forwards. Ugg.
+				// clearInterval(this.locationTimer);
+				handleBackButton();
+				return;
+			}
+			
+			// first check to see if we could have gone forward. We always halt on
+			// a no-hash item.
+			if(forwardStack.length > 0){
+				if(forwardStack[forwardStack.length-1].urlHash === hash){
+					handleForwardButton();
+					return;
+				}
+			}
+	
+			// ok, that didn't work, try someplace back in the history stack
+			if((hsl >= 2)&&(historyStack[hsl-2])){
+				if(historyStack[hsl-2].urlHash === hash){
+					handleBackButton();
+					return;
+				}
+			}
+			
+			if(dojo.isSafari && dojo.isSafari < 3){
+				var hisLen = history.length;
+				if(hisLen > historyCounter) handleForwardButton();
+				else if(hisLen < historyCounter) handleBackButton();
+			  historyCounter = hisLen;
+			}
+		}
+	};
+	
+	back.init = function(){
+		//summary: Initializes the undo stack. This must be called from a <script> 
+		//         block that lives inside the <body> tag to prevent bugs on IE.
+		// description:
+		// 		Only call this method before the page's DOM is finished loading. Otherwise
+		// 		it will not work. Be careful with xdomain loading or djConfig.debugAtAllCosts scenarios,
+		// 		in order for this method to work, dojo.back will need to be part of a build layer.
+		if(dojo.byId("dj_history")){ return; } // prevent reinit
+		var src = dojo.config["dojoIframeHistoryUrl"] || dojo.moduleUrl("dojo", "resources/iframe_history.html");
+		if (dojo._postLoad) {
+			console.error("dojo.back.init() must be called before the DOM has loaded. "
+			            + "If using xdomain loading or djConfig.debugAtAllCosts, include dojo.back "
+			            + "in a build layer.");
+		} else {
+			document.write('<iframe style="border:0;width:1px;height:1px;position:absolute;visibility:hidden;bottom:0;right:0;" name="dj_history" id="dj_history" src="' + src + '"></iframe>');
+		}
+	};
+
+	back.setInitialState = function(/*Object*/args){
+		//summary: 
+		//		Sets the state object and back callback for the very first page
+		//		that is loaded.
+		//description:
+		//		It is recommended that you call this method as part of an event
+		//		listener that is registered via dojo.addOnLoad().
+		//args: Object
+		//		See the addToHistory() function for the list of valid args properties.
+		initialState = createState(initialHref, args, initialHash);
+	};
+
+	//FIXME: Make these doc comments not be awful. At least they're not wrong.
+	//FIXME: Would like to support arbitrary back/forward jumps. Have to rework iframeLoaded among other things.
+	//FIXME: is there a slight race condition in moz using change URL with the timer check and when
+	//       the hash gets set? I think I have seen a back/forward call in quick succession, but not consistent.
+
+	
+	/*=====
+	dojo.__backArgs = function(kwArgs){
+		// back: Function?
+		//		A function to be called when this state is reached via the user
+		//		clicking the back button.
+		//	forward: Function?
+		//		Upon return to this state from the "back, forward" combination
+		//		of navigation steps, this function will be called. Somewhat
+		//		analgous to the semantic of an "onRedo" event handler.
+		//	changeUrl: Boolean?|String?
+		//		Boolean indicating whether or not to create a unique hash for
+		//		this state. If a string is passed instead, it is used as the
+		//		hash.
+	}
+	=====*/
+
+	back.addToHistory = function(/*dojo.__backArgs*/ args){
+		//	summary: 
+		//		adds a state object (args) to the history list. 
+		//	description:
+		//		To support getting back button notifications, the object
+		//		argument should implement a function called either "back",
+		//		"backButton", or "handle". The string "back" will be passed as
+		//		the first and only argument to this callback.
+		//	
+		//		To support getting forward button notifications, the object
+		//		argument should implement a function called either "forward",
+		//		"forwardButton", or "handle". The string "forward" will be
+		//		passed as the first and only argument to this callback.
+		//
+		//		If you want the browser location string to change, define "changeUrl" on the object. If the
+		//		value of "changeUrl" is true, then a unique number will be appended to the URL as a fragment
+		//		identifier (http://some.domain.com/path#uniquenumber). If it is any other value that does
+		//		not evaluate to false, that value will be used as the fragment identifier. For example,
+		//		if changeUrl: 'page1', then the URL will look like: http://some.domain.com/path#page1
+		//
+		//		There are problems with using dojo.back with semantically-named fragment identifiers
+		//		("hash values" on an URL). In most browsers it will be hard for dojo.back to know
+		//		distinguish a back from a forward event in those cases. For back/forward support to
+		//		work best, the fragment ID should always be a unique value (something using new Date().getTime()
+		//		for example). If you want to detect hash changes using semantic fragment IDs, then
+		//		consider using dojo.hash instead (in Dojo 1.4+).
+		//
+	 	//	example:
+		//		|	dojo.back.addToHistory({
+		//		|		back: function(){ console.log('back pressed'); },
+		//		|		forward: function(){ console.log('forward pressed'); },
+		//		|		changeUrl: true
+		//		|	});
+
+		//	BROWSER NOTES:
+		//  Safari 1.2: 
+		//	back button "works" fine, however it's not possible to actually
+		//	DETECT that you've moved backwards by inspecting window.location.
+		//	Unless there is some other means of locating.
+		//	FIXME: perhaps we can poll on history.length?
+		//	Safari 2.0.3+ (and probably 1.3.2+):
+		//	works fine, except when changeUrl is used. When changeUrl is used,
+		//	Safari jumps all the way back to whatever page was shown before
+		//	the page that uses dojo.undo.browser support.
+		//	IE 5.5 SP2:
+		//	back button behavior is macro. It does not move back to the
+		//	previous hash value, but to the last full page load. This suggests
+		//	that the iframe is the correct way to capture the back button in
+		//	these cases.
+		//	Don't test this page using local disk for MSIE. MSIE will not create 
+		//	a history list for iframe_history.html if served from a file: URL. 
+		//	The XML served back from the XHR tests will also not be properly 
+		//	created if served from local disk. Serve the test pages from a web 
+		//	server to test in that browser.
+		//	IE 6.0:
+		//	same behavior as IE 5.5 SP2
+		//	Firefox 1.0+:
+		//	the back button will return us to the previous hash on the same
+		//	page, thereby not requiring an iframe hack, although we do then
+		//	need to run a timer to detect inter-page movement.
+
+		//If addToHistory is called, then that means we prune the
+		//forward stack -- the user went back, then wanted to
+		//start a new forward path.
+		forwardStack = []; 
+
+		var hash = null;
+		var url = null;
+		if(!historyIframe){
+			if(dojo.config["useXDomain"] && !dojo.config["dojoIframeHistoryUrl"]){
+				console.warn("dojo.back: When using cross-domain Dojo builds,"
+					+ " please save iframe_history.html to your domain and set djConfig.dojoIframeHistoryUrl"
+					+ " to the path on your domain to iframe_history.html");
+			}
+			historyIframe = window.frames["dj_history"];
+		}
+		if(!bookmarkAnchor){
+			bookmarkAnchor = dojo.create("a", {style: {display: "none"}}, dojo.body());
+		}
+		if(args["changeUrl"]){
+			hash = ""+ ((args["changeUrl"]!==true) ? args["changeUrl"] : (new Date()).getTime());
+			
+			//If the current hash matches the new one, just replace the history object with
+			//this new one. It doesn't make sense to track different state objects for the same
+			//logical URL. This matches the browser behavior of only putting in one history
+			//item no matter how many times you click on the same #hash link, at least in Firefox
+			//and Safari, and there is no reliable way in those browsers to know if a #hash link
+			//has been clicked on multiple times. So making this the standard behavior in all browsers
+			//so that dojo.back's behavior is the same in all browsers.
+			if(historyStack.length == 0 && initialState.urlHash == hash){
+				initialState = createState(url, args, hash);
+				return;
+			}else if(historyStack.length > 0 && historyStack[historyStack.length - 1].urlHash == hash){
+				historyStack[historyStack.length - 1] = createState(url, args, hash);
+				return;
+			}
+
+			changingUrl = true;
+			setTimeout(function() { 
+					setHash(hash); 
+					changingUrl = false; 					
+				}, 1);
+			bookmarkAnchor.href = hash;
+			
+			if(dojo.isIE){
+				url = loadIframeHistory();
+
+				var oldCB = args["back"]||args["backButton"]||args["handle"];
+
+				//The function takes handleName as a parameter, in case the
+				//callback we are overriding was "handle". In that case,
+				//we will need to pass the handle name to handle.
+				var tcb = function(handleName){
+					if(getHash() != ""){
+						setTimeout(function() { setHash(hash); }, 1);
+					}
+					//Use apply to set "this" to args, and to try to avoid memory leaks.
+					oldCB.apply(this, [handleName]);
+				};
+		
+				//Set interceptor function in the right place.
+				if(args["back"]){
+					args.back = tcb;
+				}else if(args["backButton"]){
+					args.backButton = tcb;
+				}else if(args["handle"]){
+					args.handle = tcb;
+				}
+		
+				var oldFW = args["forward"]||args["forwardButton"]||args["handle"];
+		
+				//The function takes handleName as a parameter, in case the
+				//callback we are overriding was "handle". In that case,
+				//we will need to pass the handle name to handle.
+				var tfw = function(handleName){
+					if(getHash() != ""){
+						setHash(hash);
+					}
+					if(oldFW){ // we might not actually have one
+						//Use apply to set "this" to args, and to try to avoid memory leaks.
+						oldFW.apply(this, [handleName]);
+					}
+				};
+
+				//Set interceptor function in the right place.
+				if(args["forward"]){
+					args.forward = tfw;
+				}else if(args["forwardButton"]){
+					args.forwardButton = tfw;
+				}else if(args["handle"]){
+					args.handle = tfw;
+				}
+
+			}else if(!dojo.isIE){
+				// start the timer
+				if(!locationTimer){
+					locationTimer = setInterval(checkLocation, 200);
+				}
+				
+			}
+		}else{
+			url = loadIframeHistory();
+		}
+
+		historyStack.push(createState(url, args, hash));
+	};
+
+	back._iframeLoaded = function(evt, ifrLoc){
+		//summary: 
+		//		private method. Do not call this directly.
+		var query = getUrlQuery(ifrLoc.href);
+		if(query == null){ 
+			// alert("iframeLoaded");
+			// we hit the end of the history, so we should go back
+			if(historyStack.length == 1){
+				handleBackButton();
+			}
+			return;
+		}
+		if(moveForward){
+			// we were expecting it, so it's not either a forward or backward movement
+			moveForward = false;
+			return;
+		}
+	
+		//Check the back stack first, since it is more likely.
+		//Note that only one step back or forward is supported.
+		if(historyStack.length >= 2 && query == getUrlQuery(historyStack[historyStack.length-2].url)){
+			handleBackButton();
+		}else if(forwardStack.length > 0 && query == getUrlQuery(forwardStack[forwardStack.length-1].url)){
+			handleForwardButton();
+		}
+	};
+ })();
+
 }
-- 
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