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 "Filter.h"
 #include "ElemHideBase.h"
 
-class CSSPropertyFilter: public ElemHideBase
+struct CSSPropertyFilterData
 {
-private:
-  String mRegexpSource;
-  String mPrefix;
-  String mSuffix;
-public:
-  CSSPropertyFilter(const String& text, String::size_type domainsEnd,
-      String::size_type selectorStart, String::size_type prefixEnd,
-      String::size_type regexpStart, String::size_type regexpEnd,
-      String::size_type suffixStart);
-  Type GetType() const;
-  String GetRegExpString();
-  const String GetSelectorPrefix()
+  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 mPrefix;
+    return DependentString(text, selectorStart, mPrefixEnd - selectorStart);
   }
-  const String GetSelectorSuffix()
+
+  const DependentString GetRegExpSource(const String& text) const
   {
-    return mSuffix;
+    return DependentString(text, mRegexpStart, mRegexpEnd - mRegexpStart);
+  }
+
+  const DependentString GetSelectorSuffix(const String& text) const
+  {
+    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);
+  }
+};