Issue 2392/2393 - Created container for CSS property filters

lib/cssRules.js

Index: lib/cssRules.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/lib/cssRules.js
@@ -0,0 +1,76 @@
+/*
+ * 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/>.
+ */
+
+/**
+ * @fileOverview CSS property filtering implementation.
+ */
+
+let {ElemHide} = require("elemHide");
+let {Filter} =  require("filterClasses");
+
+let filters = Object.create(null);
+
+/**
+ * CSS rules component
+ * @class
+ */
+let CSSRules = exports.CSSRules =
+{
+  /**
+   * Removes all known filters
+   */
+  clear: function()
+  {
+    filters = Object.create(null);
+  },
+
+  /**
+   * Add a new CSS property filter
+   * @param {CSSPropertyFilter} filter
+   */
+  add: function(filter)
+  {
+    filters[filter.text] = true;
+  },
+
+  /**
+   * Removes a CSS property filter
+   * @param {CSSPropertyFilter} filter
+   */
+  remove: function(filter)
+  {
+    delete filters[filter.text];
+  },
+
+  /**
+   * Returns a list of all rules active on a particular domain
+   * @param {String} domain
+   * @return {Array.<CSSPropertyFilter>}

[Wladimir Palant, 2015/11/26 12:52:46]

Nit: We usually use CSSPropertyFilter[] which is shorter and more like
JavaScript. For sets or maps the awkward template syntax isn't avoidable, here
it is.

[Thomas Greiner, 2015/11/30 13:51:16]

Done. Will include that change in the commit.

+   */
+  getRulesForDomain: function(domain)
+  {
+    let result = [];
+    let keys = Object.getOwnPropertyNames(filters);
+    for (let key of keys)
+    {
+      let filter = Filter.fromText(key);
+      if (filter.isActiveOnDomain(domain) && !ElemHide.getException(filter, domain))
+        result.push(filter);
+    }
+    return result;
+  }
+};