Issue 6538, 6781 - Implement support for snippet filters

lib/snippets.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 Snippets implementation.

[Manish Jethani, 2018/04/26 13:19:17]

This is almost exactly like lib/elemHideEmulation.js

  */
 
-const {ElemHide} = require("./elemHide");
 const {Filter} = require("./filterClasses");
 
 let filters = new Set();
 
 /**
  * Container for snippet filters
  * @class
  */
 let Snippets = {
   /**
@@ skipping 18 matching lines @@
    * @param {SnippetFilter} filter
    */
   remove(filter)
   {
     filters.delete(filter.text);
   },
 
   /**
    * Returns a list of all scripts active on a particular domain
    * @param {string} domain
-   * @return {SnippetFilter[]}
+   * @return {string[]}
    */
   getScriptsForDomain(domain)
   {
     let result = [];
     for (let text of filters)
     {
       let filter = Filter.fromText(text);
-      if (filter.isActiveOnDomain(domain) &&
-          !ElemHide.getException(filter, domain))

[Manish Jethani, 2018/04/26 13:19:16]

Note: We're using ElemHide exceptions here. I feel a little odd about this,
since SnippetFilter doesn't extend ElemHideBase. It's probably OK though. At
some point ElemHideException can be changed to CodeInjectionException.

-      {
-        result.push(filter);
-      }
+      if (filter.isActiveOnDomain(domain))
+        result.push(filter.script);
     }
     return result;
   }
 };
 
 exports.Snippets = Snippets;