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"
+
+class ElemHideBase : public ActiveFilter
+{
+private:
+  String mSelector;
+public:
+  ElemHideBase(const String& text, String::size_type domainsEnd,
+      String::size_type selectorStart);
+  static Type Parse(const String& text, String::size_type* domainsEnd,
+      String::size_type* selectorStart,
+      String::size_type* prefixEnd = nullptr,
+      String::size_type* regexpStart = nullptr,
+      String::size_type* regexpEnd = nullptr,
+      String::size_type* suffixStart = nullptr);
+  static Filter* Create(const String& text);
+
+  const String GetSelector() const
+  {
+    return mSelector;
+  }
+
+  String GetSelectorDomain() const;
+};
+
+#endif