Issue 5870 - Implement the new ElemHideEmulation filter type

compiled/filter/Filter.cpp

 /*
  * 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
@@ skipping 120 matching lines @@
     case BlockingFilter::classType:
       filter = FilterPtr(new BlockingFilter(text, data.regexp), false);
       break;
     case WhitelistFilter::classType:
       filter = FilterPtr(new WhitelistFilter(text, data.regexp), false);
       break;
     case ElemHideFilter::classType:
       filter = FilterPtr(new ElemHideFilter(text, data.elemhide), false);
       break;
     case ElemHideException::classType:
-      filter = FilterPtr(new ElemHideException(text, data.elemhide), false);
+      filter = FilterPtr(
+        new ElemHideException(
+          data.elemhide.mNeedConversion ?
+          DependentString(ElemHideBase::ConvertFilter(text, data.elemhide.mSelectorStart)) :
+          text, data.elemhide), false);
       break;
     case ElemHideEmulationFilter::classType:
-      filter = FilterPtr(new ElemHideEmulationFilter(text, data.elemhide), false);
+      filter = FilterPtr(
+        new ElemHideEmulationFilter(
+          data.elemhide.mNeedConversion ?
+          DependentString(ElemHideBase::ConvertFilter(text, data.elemhide.mSelectorStart)) :
+          text, data.elemhide), false);
       if (static_cast<ElemHideEmulationFilter*>(filter.get())->IsGeneric())
         filter = FilterPtr(new InvalidFilter(text, u"filter_elemhideemulation_nodomain"_str), false);
       break;
     default:
       // This should never happen but just in case
       return nullptr;
   }
 
-  // This is a hack: we looked up the entry using text but create it using
-  // filter->mText. This works because both are equal at this point. However,
-  // text refers to a temporary buffer which will go away.
   enter_context("Adding to known filters");
-  knownFilter.assign(filter->mText, filter.get());
+  if (text != filter->mText)
+    knownFilters[filter->mText] = filter.get();
+  else
+    // This is a hack: we looked up the entry using text but create it using
+    // filter->mText. This works because both are equal at this point. However,
+    // text refers to a temporary buffer which will go away.
+    knownFilter.assign(filter->mText, filter.get());
   exit_context();
 
   return filter.release();
 }