Added handling of whitelisting rules like @@||example.com^$document

lib/matcher.js

Index: lib/matcher.js
===================================================================
--- a/lib/matcher.js
+++ b/lib/matcher.js
@@ -25,25 +25,33 @@
   // Make sure that filters don't apply to extension pages. We shouldn't allow
   // users to break our options page unintentionally, recovering is very hard
   // if they do.
   opera.extension.urlfilter.allow.add("widget://*");
 
   var WhitelistFilter = null;
   var RegExpFilter = null;
   var resourceTypes = [
-      "DOCUMENT", "FONT", "IMAGE", "MEDIA", "OBJECT", "OBJECT_SUBREQUEST",
+      "FONT", "IMAGE", "MEDIA", "OBJECT", "OBJECT_SUBREQUEST",
       "OTHER", "SCRIPT", "STYLESHEET", "SUBDOCUMENT", "XMLHTTPREQUEST"
   ];
 
   require.scopes.matcher =
   {
+    init: function()
+    {
+      WhitelistFilter = require("filterClasses").WhitelistFilter;
+      RegExpFilter = require("filterClasses").RegExpFilter;
+    },
+
     defaultMatcher:
     {
       _rules: {},
+      _domainExceptions: {},
+      _domainExceptionsTimeout: null,
 
       /**
        * Converts rule text from Adblock Plus format (implicit * at beginning
        * and end of the rule unless there is an anchor) to Opera format (* has
        * to be specified explicitly).
        */
       _getRuleText: function(/**Filter*/ filter) /**String*/
       {
@@ -134,61 +142,116 @@
        * Opera. The following options will be set:
        *
        *  type: urlfilter to be used, either "allow" or "block"
        *  text: rule text
        *  options: rule options
        */
       _generateRule: function(/**Filter*/ filter) /**Object*/
       {
-        if (!WhitelistFilter)
-        {
-          WhitelistFilter = require("filterClasses").WhitelistFilter;
-          RegExpFilter = require("filterClasses").RegExpFilter;
-        }
-
         var rule = {
           type: filter instanceof WhitelistFilter ? "allow" : "block",
           text: this._getRuleText(filter),
           options: {
             resources: this._getRuleTypes(filter)
           }
         };
         this._getRuleDomains(filter, rule.options);
         this._getRuleThirdParty(filter, rule.options);
         return rule;
       },
 
+      /**
+       * Checks whether the filter is a domain exception and adds/removes it
+       * according to the add parameter. Returns true if a domain exception
+       * has been processed, false otherwise.
+       */
+      _processDomainException: function(/**Filter*/ filter, /**Boolean*/ add) /**Boolean*/
+      {
+        if (!(filter instanceof WhitelistFilter) ||
+            filter.contentType != RegExpFilter.typeMap.DOCUMENT ||
+            filter.domainSource)
+        {
+          return false;
+        }
+
+        var match = /^\|\|([^\/]+)\^$/.exec(filter.regexpSource);
+        if (!match)
+          return false;
+
+        var domain = match[1];
+        if (add)
+          this._domainExceptions[domain] = true;
+        else
+          delete this._domainExceptions[domain];
+
+        this._updateDomainExceptions();
+        return true;
+      },
+
+      /**
+       * Updates domain exceptions rule, execution happens delayed to prevent
+       * multiple subsequent updates.
+       */
+      _updateDomainExceptions: function()
+      {
+        if (this._domainExceptionsTimeout)
+          window.clearTimeout(this._domainExceptionsTimeout);
+
+        this._domainExceptionsTimeout = window.setTimeout(function()
+        {
+          this._domainExceptionsTimeout = null;
+          opera.extension.urlfilter.allow.remove("*:*");
+
+          var domains = Object.keys(this._domainExceptions);
+          if (domains.length)
+          {
+            opera.extension.urlfilter.allow.add("*:*", {
+              includeDomains: domains
+            });
+          }
+        }.bind(this), 0);
+      },
+
       add: function(filter)
       {
+        if (this._processDomainException(filter, true))
+          return;
+
         if (filter.text in this._rules)
           return;
 
         if (!filter.regexpSource) // Regular expressions aren't supported
           return;
 
         var rule = this._generateRule(filter);
         opera.extension.urlfilter[rule.type].add(rule.text, rule.options);
         this._rules[filter.text] = rule;
       },
 
       remove: function(filter)
       {
+        if (this._processDomainException(filter, false))
+          return;
+
         if (!(filter.text in this._rules))
           return;
 
         var rule = this._rules[filter.text];
         opera.extension.urlfilter[rule.type].remove(rule.text);
         delete this._rules[filter.text];
       },
 
       clear: function()
       {
         for (var text in this._rules)
         {
           var rule = this._rules[text];
           opera.extension.urlfilter[rule.type].remove(rule.text);
         }
         this._rules = {};
+
+        this._domainExceptions = {};
+        this._updateDomainExceptions();
       }
     }
   };
 })();