Issue 3515 - Adapted polyfill for URL class for consistency

lib/polyfills/url.js

+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2015 Eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+"use strict";
+
+(function(global)
+{
+  var URLProperties = ["href", "protocol", "hostname",
+                       "host", "pathname", "search"];
+
+  // Chrome <35 and Safari 6 used the non-standard name webkitURL
+  var URL = global.URL || global.webkitURL;
+
+  // Chrome <32 didn't implement any of those properties
+  function hasProperties()
+  {
+    var dummy = new URL("about:blank");
+    for (var i = 0; i < URLProperties.length; i++)
+      if (!(URLProperties[i] in dummy))
+        return false;
+    return true;
+  }
+
+  if (!URL || !hasProperties())
+  {
+    var doc = document.implementation.createHTMLDocument();
+
+    var base = doc.createElement("base");
+    doc.head.appendChild(base);
+
+    var anchor = doc.createElement("a");
+    doc.body.appendChild(anchor);
+
+    URL = function(url, baseUrl)
+    {
+      if (baseUrl instanceof URL)
+        base.href = baseUrl.href;
+      else
+        base.href = baseUrl || "";
+      anchor.href = url;
+
+      for (var i = 0; i < URLProperties.length; i++)
+      {
+        var prop = URLProperties[i];
+        this[prop] = anchor[prop];
+      }
+    };
+  }
+
+  global.URL = URL;
+})(this);