[third_party] add polymer 1.2.3

polymer_1.2.3/bower_components/iron-page-url/iron-page-url.html

+<link rel="import" href="../polymer/polymer.html">
+
+<!--
+
+The `iron-page-url` element manages binding to and from the current URL.
+
+iron-page-url is the first, and lowest level element in the Polymer team's
+routing system. This is a beta release of iron-page-url as we continue work
+on higher level elements, and as such iron-page-url may undergo breaking
+changes.
+
+#### Properties
+
+When the URL is: `/search?query=583#details` iron-page-url's properties will be:
+
+  - path: `'/search'`
+  - query: `'query=583'`
+  - hash: `'details'`
+
+These bindings are bidirectional. Modifying them will in turn modify the URL.
+
+iron-page-url is only active while it is attached to the document.
+
+#### Links
+
+While iron-page-url is active in the document it will intercept clicks on links
+within your site, updating the URL pushing the updated URL out through the
+databinding system. iron-page-url only intercepts clicks with the intent to
+open in the same window, so middle mouse clicks and ctrl/cmd clicks work fine.
+
+You can customize this behavior with the `urlSpaceRegex`.
+
+#### Dwell Time
+
+iron-page-url protects against accidental history spamming by only adding
+entries to the user's history if the URL stays unchanged for `dwellTime`
+milliseconds.
+
+@demo demo/index.html
+
+ -->
+<script>
+  'use strict';
+
+  Polymer({
+    is: 'iron-page-url',
+    properties: {
+      /**
+       * The pathname component of the URL.
+       */
+      path: {
+        type: String,
+        notify: true,
+        value: function() {
+          return window.location.pathname;
+        }
+      },
+      /**
+       * The query string portion of the URL.
+       */
+      query: {
+        type: String,
+        notify: true,
+        value: function() {
+          return window.location.search.slice(1);
+        }
+      },
+      /**
+       * The hash component of the URL.
+       */
+      hash: {
+        type: String,
+        notify: true,
+        value: function() {
+          return window.location.hash.slice(1);
+        }
+      },
+      /**
+       * If the user was on a URL for less than `dwellTime` milliseconds, it
+       * won't be added to the browser's history, but instead will be replaced
+       * by the next entry.
+       *
+       * This is to prevent large numbers of entries from clogging up the user's
+       * browser history. Disable by setting to a negative number.
+       */
+      dwellTime: {
+        type: Number,
+        value: 2000
+      },
+
+      /**
+       * A regexp that defines the set of URLs that should be considered part
+       * of this web app.
+       *
+       * Clicking on a link that matches this regex won't result in a full page
+       * navigation, but will instead just update the URL state in place.
+       *
+       * This regexp is given everything after the origin in an absolute
+       * URL. So to match just URLs that start with /search/ do:
+       *     url-space-regex="^/search/"
+       *
+       * @type {string|RegExp}
+       */
+      urlSpaceRegex: {
+        type: String,
+        value: ''
+      },
+
+      /**
+       * urlSpaceRegex, but coerced into a regexp.
+       *
+       * @type {RegExp}
+       */
+      _urlFilterRegExp: {
+        compute: '_makeRegExp(urlFilterExp)'
+      },
+
+      _lastChangedAtAt: {
+        type: Number,
+        value: -Infinity
+      },
+
+      _initialized: {
+        type: Boolean,
+        value: false
+      }
+    },
+    hostAttributes: {
+      hidden: true
+    },
+    observers: [
+      '_updateUrl(path, query, hash)'
+    ],
+    attached: function() {
+      this.listen(window, 'hashchange', '_hashChanged');
+      this.listen(window, 'location-changed', '_urlChanged');
+      this.listen(window, 'popstate', '_urlChanged');
+      this.listen(document.body, 'click', '_globalOnClick');
+
+      this._urlChanged();
+      this._initialized = true;
+    },
+    detached: function() {
+      this.unlisten(window, 'hashchange', '_hashChanged');
+      this.unlisten(window, 'location-changed', '_urlChanged');
+      this.unlisten(window, 'popstate', '_urlChanged');
+      this.unlisten(document.body, 'click', '_globalOnClick');
+      this._initialized = false;
+    },
+    /**
+     * @return {number} the number of milliseconds since some point in the
+     *     past. Only useful for comparing against other results from this
+     *     function.
+     */
+    _now: function() {
+      if (window.performance && window.performance.now) {
+        return window.performance.now();
+      }
+      return +new Date();
+    },
+    _hashChanged: function() {
+      this.hash = window.location.hash.substring(1);
+    },
+    _urlChanged: function() {
+      // We want to extract all info out of the updated URL before we
+      // try to write anything back into it.
+      //
+      // i.e. without _dontUpdateUrl we'd overwrite the new path with the old
+      // one when we set this.hash. Likewise for query.
+      this._dontUpdateUrl = true;
+      this._hashChanged();
+      this.path = window.location.pathname;
+      this.query = window.location.search.substring(1);
+      this._dontUpdateUrl = false;
+      this._updateUrl();
+    },
+    _getUrl: function() {
+      var url = this.path;
+      var query = this.query;
+      if (query) {
+        url += '?' + query;
+      }
+      if (this.hash) {
+        url += '#' + this.hash;
+      }
+      return url;
+    },
+    _updateUrl: function() {
+      if (this._dontUpdateUrl || !this._initialized) {
+        return;
+      }
+      var newUrl = this._getUrl();
+      var currentUrl = (
+          window.location.pathname +
+          window.location.search +
+          window.location.hash
+      );
+      if (newUrl == currentUrl) {
+        // nothing to do, the URL didn't change
+        return;
+      }
+
+      var shouldReplace =
+          this._lastChangedAt + this.dwellTime > this._now();
+      this._lastChangedAt = this._now();
+      if (shouldReplace) {
+        window.history.replaceState({}, '', newUrl);
+      } else {
+        window.history.pushState({}, '', newUrl);
+      }
+    },
+    /**
+     * A necessary evil so that links work as expected. Does its best to
+     * bail out early if possible.
+     *
+     * @param {MouseEvent} event .
+     */
+    _globalOnClick: function(event) {
+      var href = this._getSameOriginLinkHref(event);
+      if (!href) {
+        return;
+      }
+
+      window.history.pushState({}, '', href);
+      this.fire('location-changed', {}, {node: window});
+      event.preventDefault();
+    },
+    /**
+     * Returns the absolute URL of the link (if any) that this click event
+     * is clicking on, if we can and should override the resulting full
+     * page navigation. Returns null otherwise.
+     *
+     * This method is separated away from _globalOnClick for testability,
+     * as we can't test that a clicked link should have resulted in navigating
+     * away from the test page.
+     *
+     * @param {MouseEvent} event .
+     * @return {string?} .
+     */
+    _getSameOriginLinkHref: function(event) {
+      // We only care about left-clicks.
+      if (event.button !== 0) {
+        return null;
+      }
+      // We don't want modified clicks, where the intent is to open the page
+      // in a new tab.
+      if (event.metaKey || event.ctrlKey) {
+        return null;
+      }
+      var eventPath = Polymer.dom(event).path;
+      var href = null;
+      for (var i = 0; i < eventPath.length; i++) {
+        var element = eventPath[i];
+        if (element.tagName === 'A' && element.href) {
+          href = element.href;
+          break;
+        }
+      }
+      // If there's no link there's nothing to do.
+      if (!href) {
+        return null;
+      }
+
+      // It only makes sense for us to intercept same-origin navigations.
+      // pushState/replaceState don't work with cross-origin links.
+      var url = new URL(href, document.baseURI);
+      if (url.origin !== window.location.origin) {
+        return null;
+      }
+      var normalizedHref = url.pathname + url.search + url.hash;
+
+      // If we've been configured not to handle this url... don't handle it!
+      if (this._urlFilterRegExp &&
+          !this._urlFilterRegExp.test(normalizedHref)) {
+        return null;
+      }
+
+      return normalizedHref;
+    },
+    _makeRegExp: function(urlFilterExp) {
+      return RegExp(urlFilterExp);
+    }
+  });
+</script>