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

compiled/CSSPropertyFilter.h

-#ifndef ADBLOCK_PLUS_CSS_PROPERTY_FILTER_H
-#define ADBLOCK_PLUS_CSS_PROPERTY_FILTER_H
+#pragma once
 
 #include <cstddef>
-#include <string>
 
 #include "Filter.h"
 #include "ElemHideBase.h"
 
-class CSSPropertyFilter: public ElemHideBase
+struct CSSPropertyFilterData
 {
-private:
-  std::u16string regexp;
-  std::u16string prefix;
-  std::u16string suffix;
-public:
-  CSSPropertyFilter(const std::u16string& text, const std::u16string& domains,
-      const std::u16string& selector, const std::u16string& regexpSource,
-      const std::u16string& prefix, const std::u16string& suffix);
-  Type GetType() const;
-  const std::u16string GetRegExpString()
+  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 regexp;
+    return DependentString(text, selectorStart, mPrefixEnd - selectorStart);
   }
-  const std::u16string GetSelectorPrefix()
+
+  const DependentString GetRegExpSource(const String& text) const
   {
-    return prefix;
+    return DependentString(text, mRegexpStart, mRegexpEnd - mRegexpStart);
   }
-  const std::u16string GetSelectorSuffix()
+
+  const DependentString GetSelectorSuffix(const String& text) const
   {
-    return suffix;
+    return DependentString(text, mSuffixStart);
   }
 };
 
-#endif
+struct ElemHideData : ElemHideBaseData, CSSPropertyFilterData
+{
+};
+
+class CSSPropertyFilter: public ElemHideBase
+{
+protected:
+  CSSPropertyFilterData mPropertyData;
+public:
+  explicit CSSPropertyFilter(const String& text, const ElemHideData& data);
+  EMSCRIPTEN_KEEPALIVE OwnedString GetRegExpString() const;
+  EMSCRIPTEN_KEEPALIVE const DependentString GetSelectorPrefix() const
+  {
+    return mPropertyData.GetSelectorPrefix(mText, mData.mSelectorStart);
+  }
+  EMSCRIPTEN_KEEPALIVE const DependentString GetSelectorSuffix() const
+  {
+    return mPropertyData.GetSelectorSuffix(mText);
+  }
+};