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if (handler.route.test(fragment)) {

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handler.callback(fragment);

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return true;

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}

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});

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// Save a fragment into the hash history, or replace the URL state if the

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// 'replace' option is passed. You are responsible for properly URL-encoding

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// the fragment in advance.

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// The options object can contain `trigger: true` if you wish to have the

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// route callback be fired (not usually desirable), or `replace: true`, if

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// you wish to modify the current URL without adding an entry to the history.

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navigate: function(fragment, options) {

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if (!History.started) return false;

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if (!options || options === true) options = {trigger: !!options};

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// Normalize the fragment.

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fragment = this.getFragment(fragment || '');

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// Strip trailing slash on the root unless _trailingSlash is true

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var rootPath = this.root;

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if (!this._trailingSlash && (fragment === '' || fragment.charAt(0) === '?')) {

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rootPath = rootPath.slice(0, -1) || '/';

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}

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var url = rootPath + fragment;

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// Strip the fragment of the query and hash for matching.

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fragment = fragment.replace(pathStripper, '');

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// Decode for matching.

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var decodedFragment = this.decodeFragment(fragment);

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if (this.fragment === decodedFragment) return;

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this.fragment = decodedFragment;

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// If pushState is available, we use it to set the fragment as a real URL.

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if (this._usePushState) {

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this.history[options.replace ? 'replaceState' : 'pushState']({}, document.title, url);

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// If hash changes haven't been explicitly disabled, update the hash

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// fragment to store history.

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} else if (this._wantsHashChange) {

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this._updateHash(this.location, fragment, options.replace);

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if (this.iframe && fragment !== this.getHash(this.iframe.contentWindow)) {

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var iWindow = this.iframe.contentWindow;

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// Opening and closing the iframe tricks IE7 and earlier to push a

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// history entry on hash-tag change. When replace is true, we don't

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// want this.

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if (!options.replace) {

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iWindow.document.open();

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iWindow.document.close();

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}

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this._updateHash(iWindow.location, fragment, options.replace);

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}

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// If you've told us that you explicitly don't want fallback hashchange-

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// based history, then `navigate` becomes a page refresh.

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} else {

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return this.location.assign(url);

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}

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if (options.trigger) return this.loadUrl(fragment);

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// Update the hash location, either replacing the current entry, or adding

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// a new one to the browser history.

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_updateHash: function(location, fragment, replace) {

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if (replace) {

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var href = location.href.replace(/(javascript:|#).*$/, '');

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location.replace(href + '#' + fragment);

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} else {

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// Some browsers require that `hash` contains a leading #.

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location.hash = '#' + fragment;

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}

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}

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});

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// Create the default Backbone.history.

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Backbone.history = new History;

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// Helpers

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// -------

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// Helper function to correctly set up the prototype chain for subclasses.

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// Similar to `goog.inherits`, but uses a hash of prototype properties and

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// class properties to be extended.

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var extend = function(protoProps, staticProps) {

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var parent = this;

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var child;

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// The constructor function for the new subclass is either defined by you

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// (the "constructor" property in your `extend` definition), or defaulted

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// by us to simply call the parent constructor.

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if (protoProps && _.has(protoProps, 'constructor')) {

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child = protoProps.constructor;

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} else {

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child = function(){ return parent.apply(this, arguments); };

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}

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// Add static properties to the constructor function, if supplied.

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_.extend(child, parent, staticProps);

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// Set the prototype chain to inherit from `parent`, without calling

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// `parent`'s constructor function and add the prototype properties.

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child.prototype = _.create(parent.prototype, protoProps);

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child.prototype.constructor = child;

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// Set a convenience property in case the parent's prototype is needed

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// later.

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child.__super__ = parent.prototype;

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return child;

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};

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// Set up inheritance for the model, collection, router, view and history.

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Model.extend = Collection.extend = Router.extend = View.extend = History.extend = extend;

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// Throw an error when a URL is needed, and none is supplied.

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var urlError = function() {

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throw new Error('A "url" property or function must be specified');

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};

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// Wrap an optional error callback with a fallback error event.

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var wrapError = function(model, options) {

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var error = options.error;

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options.error = function(resp) {

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if (error) error.call(options.context, model, resp, options);

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model.trigger('error', model, resp, options);

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};

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};

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return Backbone;

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});

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