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

compiled/CSSPropertyFilter.h

+#pragma once
+
+#include <cstddef>
+
+#include "Filter.h"
+#include "ElemHideBase.h"
+
+struct CSSPropertyFilterData
+{
+  String::size_type mPrefixEnd;
+  String::size_type mRegexpStart;
+  String::size_type mRegexpEnd;
+  String::size_type mSuffixStart;
+
+  const DependentString GetSelectorPrefix(const String& text,
+      String::size_type selectorStart) const
+  {
+    return DependentString(text, selectorStart, mPrefixEnd - selectorStart);
+  }
+
+  const DependentString GetRegExpSource(const String& text) const
+  {
+    return DependentString(text, mRegexpStart, mRegexpEnd - mRegexpStart);
+  }
+
+  const DependentString GetSelectorSuffix(const String& text) const
+  {
+    return DependentString(text, mSuffixStart);
+  }
+};
+
+struct ElemHideData : ElemHideBaseData, CSSPropertyFilterData
+{
+};
+
+class CSSPropertyFilter: public ElemHideBase, protected CSSPropertyFilterData
+{
+public:
+  CSSPropertyFilter(const String& text, const ElemHideData& data);
+  Type GetType() const override;
+  EMSCRIPTEN_KEEPALIVE OwnedString GetRegExpString() const;
+  EMSCRIPTEN_KEEPALIVE const DependentString GetSelectorPrefix() const
+  {
+    return CSSPropertyFilterData::GetSelectorPrefix(mText, mSelectorStart);
+  }
+  EMSCRIPTEN_KEEPALIVE const DependentString GetSelectorSuffix() const
+  {
+    return CSSPropertyFilterData::GetSelectorSuffix(mText);
+  }
+};