Issue 4125 - [emscripten] Convert filter classes to C++

compiled/ElemHideBase.h

+#pragma once
+
+#include <cstddef>
+
+#include "ActiveFilter.h"
+
+struct ElemHideBaseData
+{
+  String::size_type mDomainsEnd;
+  String::size_type mSelectorStart;
+
+  bool HasDomains() const
+  {
+    return mDomainsEnd != 0;
+  }
+
+  DependentString GetDomainsSource(String& text) const
+  {
+    return DependentString(text, 0, mDomainsEnd);
+  }
+
+  const DependentString GetDomainsSource(const String& text) const
+  {
+    return DependentString(text, 0, mDomainsEnd);
+  }
+
+  DependentString GetSelector(String& text) const
+  {
+    return DependentString(text, mSelectorStart);
+  }
+
+  const DependentString GetSelector(const String& text) const
+  {
+    return DependentString(text, mSelectorStart);
+  }
+};
+
+struct ElemHideData;
+
+class ElemHideBase : public ActiveFilter, protected ElemHideBaseData
+{
+public:
+  ElemHideBase(const String& text, const ElemHideBaseData& data);
+  static Type Parse(DependentString& text, ElemHideData& data);
+
+  EMSCRIPTEN_KEEPALIVE const DependentString GetSelector() const
+  {
+    return ElemHideBaseData::GetSelector(mText);
+  }
+
+  EMSCRIPTEN_KEEPALIVE OwnedString GetSelectorDomain() const;
+};