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

compiled/ElemHideBase.h

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