Issue 5781 - Merge messages for regular and emulated element hiding filters

lib/cssInjection.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/>.
  */
 
 /** @module cssInjection */
 
 "use strict";
 
 const {RegExpFilter} = require("filterClasses");
 const {ElemHide} = require("elemHide");
+const {ElemHideEmulation} = require("elemHideEmulation");
 const {checkWhitelisted} = require("whitelisting");
 const {extractHostFromFrame} = require("url");
 const {port} = require("messaging");
 const devtools = require("devtools");
 
 const userStyleSheetsSupported = "extensionTypes" in chrome &&
                                  "CSSOrigin" in chrome.extensionTypes;
 
 function hideElements(tabId, frameId, selectors)
 {
   chrome.tabs.insertCSS(tabId, {
     code: selectors.join(", ") + "{display: none !important;}",
     cssOrigin: "user",
     frameId,
     matchAboutBlank: true,
     runAt: "document_start"
   });
 }
 
 port.on("elemhide.getSelectors", (msg, sender) =>
 {
   let selectors = [];
+  let emulatedPatterns = [];
   let trace = devtools && devtools.hasPanel(sender.page);
   let inject = !userStyleSheetsSupported;
 
   if (!checkWhitelisted(sender.page, sender.frame,
                         RegExpFilter.typeMap.DOCUMENT |
                         RegExpFilter.typeMap.ELEMHIDE))
   {
+    let hostname = extractHostFromFrame(sender.frame);
     let specificOnly = checkWhitelisted(sender.page, sender.frame,
                                         RegExpFilter.typeMap.GENERICHIDE);
+
     selectors = ElemHide.getSelectorsForDomain(
-      extractHostFromFrame(sender.frame),
+      hostname,
       specificOnly ? ElemHide.SPECIFIC_ONLY : ElemHide.ALL_MATCHING
     );
+
+    for (let filter of ElemHideEmulation.getRulesForDomain(hostname))
+      emulatedPatterns.push({selector: filter.selector, text: filter.text});
   }
 
   if (!inject && selectors.length > 0)
     hideElements(sender.page.id, sender.frame.id, selectors);
 
-  let response = {trace, inject};
+  let response = {trace, inject, emulatedPatterns};
   if (trace || inject)
     response.selectors = selectors;
 
   return response;
 });
 
 port.on("elemhide.injectSelectors", (msg, sender) =>
 {
   hideElements(sender.page.id, sender.frame.id, msg.selectors);
 });