Issue 4167 - getSelectorsForDomain criteria + keys

lib/elemHide.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 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
@@ skipping 162 matching lines @@
       else
       {
         // The new filter's selector only applies to some domains
         this._addToFiltersByDomain(key, filter);
       }
     }
 
     FilterNotifier.emit("elemhideupdate");
   },
 
-  /**
-   * Removes an element hiding filter
-   * @param {ElemHideFilter} filter
-   */
-  remove: function(filter)
-  {
-    if (filter instanceof ElemHideException)
-    {
-      if (!(filter.text in knownExceptions))
-        return;
-
-      let list = exceptions[filter.selector];
-      let index = list.indexOf(filter);
+  _removeFilterKey: function(key, filter)
+  {
+    let filterKeys = filterKeysBySelector[filter.selector];
+    if (filterKeys)
+    {
+      let index = filterKeys.indexOf(key);
       if (index >= 0)
-        list.splice(index, 1);
-      delete knownExceptions[filter.text];
-    }
-    else
-    {
-      if (!(filter.text in keyByFilter))
-        return;
-
-      let key = keyByFilter[filter.text];
-      delete filterByKey[key];
-      delete keyByFilter[filter.text];
-
-      let filterKeys = filterKeysBySelector[filter.selector];
-      if (filterKeys)
       {
         if (filterKeys.length > 1)
         {
-          let index = filterKeys.indexOf(key);
           filterKeys.splice(index, 1);

[Wladimir Palant, 2016/09/20 10:36:07]

We need to null out unconditionalFilterKeys here if index is 0.

[kzar, 2016/09/20 14:23:48]

Good point, Done.

+          if (index == 0)
+            unconditionalFilterKeys = null;
         }
         else
         {
           delete filterKeysBySelector[filter.selector];
           unconditionalSelectors = unconditionalFilterKeys = null;
         }
+        return;
       }
-      else
-      {
-        let domains = filter.domains || defaultDomains;
-        for (let domain in domains)
-        {
-          let filters = filtersByDomain[domain];
-          if (filters)
-            delete filters[key];
-        }
-      }
+    }
+
+    // We haven't found this filter in unconditional filters, look in
+    // filtersByDomain.
+    let domains = filter.domains || defaultDomains;
+    for (let domain in domains)
+    {
+      let filters = filtersByDomain[domain];
+      if (filters)
+        delete filters[key];
+    }
+  },
+
+  /**
+   * Removes an element hiding filter
+   * @param {ElemHideFilter} filter
+   */
+  remove: function(filter)
+  {
+    if (filter instanceof ElemHideException)
+    {
+      if (!(filter.text in knownExceptions))
+        return;
+
+      let list = exceptions[filter.selector];
+      let index = list.indexOf(filter);
+      if (index >= 0)
+        list.splice(index, 1);
+      delete knownExceptions[filter.text];
+    }
+    else
+    {
+      if (!(filter.text in keyByFilter))
+        return;
+
+      let key = keyByFilter[filter.text];
+      delete filterByKey[key];
+      delete keyByFilter[filter.text];
+      this._removeFilterKey(key, filter);
     }
 
     FilterNotifier.emit("elemhideupdate");
   },
 
   /**
    * Checks whether an exception rule is registered for a filter on a particular
    * domain.
    */
   getException: function(/**Filter*/ filter, /**String*/ docDomain) /**ElemHideException*/
@@ skipping 66 matching lines @@
     if (!unconditionalFilterKeys)
     {
       let selectors = this.getUnconditionalSelectors();
       unconditionalFilterKeys = [];
       for (let selector of selectors)
         unconditionalFilterKeys.push(filterKeysBySelector[selector][0]);
     }
     return unconditionalFilterKeys.slice();
   },
 
-  /**
-   * Returns a list of all selectors active on a particular domain. Optionally
-   * a list of corresponding filter keys for the selectors can be returned too.
-   */
-  getSelectorsForDomain: function(/**String*/ domain, /**Boolean*/ specificOnly,
-                                  /**Boolean*/ noUnconditional,
-                                  /**Boolean*/ provideFilterKeys)
+
+  /**
+   * Constant used by getSelectorsForDomain to return all selectors applying to
+   * a particular hostname.
+   */
+  ALL_MATCHING: 0,
+
+  /**
+   * Constant used by getSelectorsForDomain to exclude selectors which apply to
+   * all websites without exception.
+   */
+  NO_UNCONDITIONAL: 1,
+
+  /**
+   * Constant used by getSelectorsForDomain to return only selectors for filters
+   * which specifically match the given host name.
+   */
+  SPECIFIC_ONLY: 2,
+
+  /**
+   * Determines from the current filter list which selectors should be applied
+   * on a particular host name. Optionally returns the corresponding filter
+   * keys.
+   * @param {String} domain
+   * @param {Number} [criteria]
+   *   One of the following: ElemHide.ALL_MATCHING, ElemHide.NO_UNCONDITIONAL or
+   *                         ElemHide.SPECIFIC_ONLY.
+   * @param {Boolean} [provideFilterKeys]
+   *   If true, the function will return a list of corresponding filter keys in
+   *   addition to selectors.
+   * @returns {string[]|Array.<string[]>}
+   *   List of selectors or an array with two elements (list of selectors and
+   *   list of corresponding keys) if provideFilterKeys is true.
+   */
+  getSelectorsForDomain: function(domain, criteria, provideFilterKeys)
   {
     let filterKeys = [];
     let selectors = [];
-    if (!specificOnly && !noUnconditional)
+
+    if (typeof criteria == "undefined")
+      criteria = ElemHide.ALL_MATCHING;
+    if (criteria < ElemHide.NO_UNCONDITIONAL)
     {
       selectors = this.getUnconditionalSelectors();
       if (provideFilterKeys)
         filterKeys = this.getUnconditionalFilterKeys();
     }
 
+    let specificOnly = (criteria >= ElemHide.SPECIFIC_ONLY);
     let seenFilters = Object.create(null);
     let currentDomain = domain ? domain.toUpperCase() : "";
     while (true)
     {
       if (specificOnly && currentDomain == "")
         break;
 
       let filters = filtersByDomain[currentDomain];
       if (filters)
       {
@@ skipping 19 matching lines @@
       let nextDot = currentDomain.indexOf(".");
       currentDomain = nextDot == -1 ? "" : currentDomain.substr(nextDot + 1);
     }
 
     if (provideFilterKeys)
       return [selectors, filterKeys];
     else
       return selectors;
   }
 };