Refactoring navigation handling

Not done yet, but the tests are passing so it's a good point to check
in. The idea is to let macros register for events to handle both the
click and the navigation request.

js/Navigators.js

@@ -28,14 +28,14 @@ Navigators.prototype.registerNavigator = function(name,nav) {
 
 Navigators.prototype.install = function(selector,navname) {
 	var nav = this.navigators[navname];
-	this.document.addEventListener("click",function(e) {
-		var el = e.target,
+	this.document.addEventListener("click",function(event) {
+		var el = event.target,
 			matchesSelector = el.matchesSelector || el.mozMatchesSelector ||
 				el.webkitMatchesSelector || el.oMatchesSelector || el.msMatchesSelector;
 		if(matchesSelector && matchesSelector.call(el,selector)) {
-			var r = nav.navigateTo(el.getAttribute("href"));
+			var r = nav.navigateTo(el.getAttribute("href"),event);
 			if(!r) {
-				e.preventDefault();
+				event.preventDefault();
 			} else {
 				el.setAttribute("target","_blank");
 			}

js/StoryNavigator.js

@@ -15,15 +15,14 @@ var StoryNavigator = function(navigators) {
 	this.navigators = navigators;
 };
 
-StoryNavigator.prototype.navigateTo = function(title) {
+StoryNavigator.prototype.navigateTo = function(title,event) {
 	var store = this.navigators.store,
-		tiddler = store.getTiddler(title),
-		storyTiddler = store.getTiddler("StoryTiddlers"); // This is a hack, obviously
+		tiddler = store.getTiddler(title);
 	if(tiddler) {
-		store.addTiddler(new Tiddler(storyTiddler,{text: title + "\n" + storyTiddler.text}));
-		$("html,body").animate({
-			scrollTop: 0
-		}, 400);
+		store.invokeMacroMethod(event.target,"navigateTo",{
+			event: event,
+			target: title
+		});
 		return false;
 	} else {
 		return true;		

js/WikiStore.js

@@ -472,6 +472,62 @@ WikiStore.prototype.refreshDomNode = function(node,changes,renderer,tiddler) {
 	}
 };
 
+/*
+Search up the parents of the specified node, looking for a macro that accepts the specified method
+*/
+WikiStore.prototype.invokeMacroMethod = function(node,method,args) {
+	// Walk up the DOM chain to get the context tiddler for each node
+	var contextStack = [],
+		macroStack = [],
+		nodeStack = [],
+		parentWalker = function(node) {
+			if(node.parentNode !== null) {
+				var parentContext = parentWalker(node.parentNode),
+					contextInfo = {tiddler: parentContext.tiddler, template: parentContext.template},
+					macroInfo = {};
+				if(node.getAttribute) {
+					if(node.hasAttribute("data-tw-render-tiddler")) {
+						contextInfo.tiddler = node.getAttribute("data-tw-render-tiddler");
+						contextInfo.template = node.getAttribute("data-tw-render-template");
+					}
+					macroInfo.macro = node.getAttribute("data-tw-macro");
+					macroInfo.step = node.getAttribute("data-tw-render-step");
+				}
+				nodeStack.push(node);
+				contextStack.push(contextInfo);
+				macroStack.push(macroInfo);
+				return contextInfo;
+			} else {
+				return {tiddler: null, template: null};
+			}
+		};
+	parentWalker(node);
+	// Walk back up the DOM chain to find a macro that can handle this method
+	var t;
+	for(t=nodeStack.length-1; t>=0; t--) {
+		var macro = macroStack[t].macro;
+		if(macro && this.macros[macro].hasOwnProperty(method)) {
+			var renderTitle = contextStack[t].tiddler,
+				renderTemplate = contextStack[t].template,
+				renderStep = macroStack[t].step;
+			if(typeof renderTemplate !== "string") {
+				renderTemplate = renderTitle;
+			}
+			var renderTiddler = this.getTiddler(renderTitle),
+				renderer = this.compileTiddler(renderTemplate,"text/html");
+			var ret = this.macros[macro][method](args,
+												nodeStack[t],
+												renderTiddler,
+												this,
+												renderer.renderSteps[renderStep].params(renderTiddler,renderer,this,utils));
+			if(ret) {
+				return true;
+			}
+		}		
+	}
+	return false; // Didn't manage to dispatch it
+};
+
 exports.WikiStore = WikiStore;
 
 })();

js/macros/story.js

@@ -7,7 +7,8 @@ title: js/macros/story.js
 /*jslint node: true */
 "use strict";
 
-var utils = require("../Utils.js");
+var Tiddler = require("../Tiddler.js").Tiddler,
+	utils = require("../Utils.js");
 
 // Parse the text of a story tiddler into an array of tiddler titles
 var parseStory = function(storyText) {
@@ -87,6 +88,15 @@ exports.macro = {
 			node.removeChild(currNode);
 			currNode = nextNode;
 		}
+	},
+	navigateTo: function(args,node,tiddler,store,params) {
+		/*jslint jquery: true */
+		var storyTiddler = store.getTiddler(params.story);
+		store.addTiddler(new Tiddler(storyTiddler,{text: args.target + "\n" + storyTiddler.text}));
+		$("html,body").animate({
+			scrollTop: 0
+		}, 400);
+		return true;
 	}
 };