Issue 5143 - Convert ElemHideEmulation to C++

compiled/ElemHideEmulation.cpp

Index: compiled/ElemHideEmulation.cpp
===================================================================
new file mode 100644
--- /dev/null
+++ b/compiled/ElemHideEmulation.cpp
@@ -0,0 +1,51 @@
+/*
+ * 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/>.
+ */
+
+#include "ElemHide.h"
+#include "ElemHideEmulation.h"
+
+ElemHideEmulation* ElemHideEmulation::mInstance = new ElemHideEmulation();
+
+void ElemHideEmulation::Add(ElemHideBase& filter)
+{
+  mFilters[filter.GetText()] = ElemHideBasePtr(&filter);
+}
+
+void ElemHideEmulation::Remove(ElemHideBase& filter)
+{
+  mFilters.erase(filter.GetText());
+}
+
+void ElemHideEmulation::Clear()
+{
+  mFilters.clear();
+}
+
+_ElemHideEmulation_FilterList* ElemHideEmulation::GetRulesForDomain(DependentString& domain)
+{
+  auto result = new _ElemHideEmulation_FilterList;

[sergei, 2017/11/16 09:58:06]

I would prefer to have the type of `result` intrusive_ptr.

[hub, 2017/11/20 19:16:00]

Done.

+  for (auto filter: mFilters)
+  {
+    DependentString docDomain(domain);

[hub, 2017/11/02 04:11:13]

IsActiveOnDomain() will modify the DependentString passed to it, which makes
everything else fail. It is subtle. And IMHO it would be better if we made
IsActiveOnDomain() use an immutable domain string - (albeit it calls lowerCase()
on it which modifies the string in place)

[sergei, 2017/11/16 09:58:06]

agree.

+    if (!filter.is_deleted() &&

[hub, 2017/11/02 04:11:13]

IMHO we should change StringMap<> iterator so that the deleted entries are
skipped.

[sergei, 2017/11/16 09:58:06]

agree

+        filter.second->IsActiveOnDomain(docDomain, u""_str) &&
+        !ElemHide::GetInstance()->GetException(*filter.second, domain))
+      result->push_back(filter.second);
+  }
+
+  return result;
+}