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 <string>
+
+#include "ActiveFilter.h"
+
+class ElemHideBase : public ActiveFilter
+{
+private:
+  std::u16string selector;
+public:
+  ElemHideBase(const std::u16string& text, const std::u16string& domains,
+      const std::u16string& selector);
+  static Type Parse(const std::u16string& text, size_t* domainsEnd,
+      size_t* selectorStart, size_t* prefixEnd = nullptr,
+      size_t* regexpStart = nullptr, size_t* regexpEnd = nullptr,
+      size_t* suffixStart = nullptr);
+  static Filter* Create(const std::u16string& text);
+
+  const std::u16string GetSelector() const
+  {
+    return selector;
+  }
+
+  const std::u16string GetSelectorDomain() const;
+};
+
+#endif