Issue 6665 - Split out element hiding exceptions into their own module

lib/elemHideExceptions.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present 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";
 
 /**
  * @fileOverview Element hiding exceptions implementation.

[Manish Jethani, 2018/05/17 05:42:48]

The relevant parts from lib/elemHide.js have been copied into this file with no
further modifications, plus this module also emits "added" and "removed" events
(as well as "elemhideupdate") when a filter is added or removed respectively.

  */
 
 const {EventEmitter} = require("./events");
 const {FilterNotifier} = require("./filterNotifier");
 
 /**
  * Lookup table, lists of element hiding exceptions by selector
  * @type {Map.<string,ElemHideException[]>}
  */
 let exceptions = new Map();
@@ skipping 68 matching lines @@
    * Checks whether any exception rules are registered for a selector
    * @param {string} selector
    * @returns {boolean}
    */
   hasExceptions(selector)
   {
     return exceptions.has(selector);
   },
 
   /**
-   * Checks whether an exception rule is registered for a filter on a particular
-   * domain.
-   * @param {ElemHideFilter|ElemHideEmulationFilter} filter
+   * Checks whether an exception rule is registered for a selector on a
+   * particular domain.
+   * @param {string} selector
    * @param {?string} docDomain
    * @return {?ElemHideException}
    */
-  getException(filter, docDomain)
+  getException(selector, docDomain)
   {
-    let list = exceptions.get(filter.selector);
+    let list = exceptions.get(selector);
     if (!list)
       return null;
 
     for (let i = list.length - 1; i >= 0; i--)
     {
       if (list[i].isActiveOnDomain(docDomain))
         return list[i];
     }
 
     return null;
   }
 });