inital setup/cleaning for v3

lib/epubjs/navigation.js

@@ -0,0 +1,91 @@
+EPUBJS.Navigation = function(_package, _request){
+  var navigation = this;
+  var parse = new EPUBJS.Parser();
+  var request = _request || EPUBJS.core.request;
+
+  this.package = _package;
+  this.toc = [];
+  this.tocByHref = {};
+  this.tocById = {};
+
+  if(_package.navPath) {
+    this.navUrl = _package.baseUrl + _package.navPath;
+    this.nav = {};
+
+    this.nav.load = function(_request){
+      var loading = new RSVP.defer();
+      var loaded = loading.promise;
+      
+      request(navigation.navUrl, 'xml').then(function(xml){
+        navigation.toc = parse.nav(xml);
+        navigation.loaded(navigation.toc);
+        loading.resolve(navigation.toc);
+      });
+
+      return loaded;
+    };
+
+  }
+  
+  if(_package.ncxPath) {
+    this.ncxUrl = _package.baseUrl + _package.ncxPath;
+    this.ncx = {};
+  
+    this.ncx.load = function(_request){
+      var loading = new RSVP.defer();
+      var loaded = loading.promise;
+
+      request(navigation.ncxUrl, 'xml').then(function(xml){
+        navigation.toc = parse.ncx(xml);
+        navigation.loaded(navigation.toc);
+        loading.resolve(navigation.toc);
+      });
+
+      return loaded;
+    };
+    
+  }
+};
+
+// Load the navigation
+EPUBJS.Navigation.prototype.load = function(_request) {
+  var request = _request || EPUBJS.core.request;
+  var loading;
+
+  if(this.nav) {
+    loading = this.nav.load();
+  } else if(this.ncx) {
+    loading = this.ncx.load();
+  }
+
+  return loading;
+  
+};
+
+EPUBJS.Navigation.prototype.loaded = function(toc) {
+  var item;
+
+  for (var i = 0; i < toc.length; i++) {
+    var item = toc[i];
+    this.tocByHref[item.href] = i;
+    this.tocById[item.id] = i;
+  };
+
+};
+
+// Get an item from the navigation
+EPUBJS.Navigation.prototype.get = function(target) {
+  var index;
+
+  if(!target) {
+    return this.toc;
+  }
+
+  if(target.indexOf("#") === 0) {
+    index = this.tocById[target.substring(1)];
+  } else if(target in this.tocByHref){
+    index = this.tocByHref[target];
+  }
+
+  return this.toc[index];
+};