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

compiled/Filter.h

-#ifndef ADBLOCK_PLUS_FILTER_H
-#define ADBLOCK_PLUS_FILTER_H
+#pragma once
 
-#include <memory>
-#include <string>
 #include <vector>
 
-class Filter;
+#include "String.h"
+#include "intrusive_ptr.h"
+#include "debug.h"
 
-typedef std::shared_ptr<Filter> FilterPtr;
-
-class Filter
+class Filter : public ref_counted
 {
-private:
-  std::wstring text;
+protected:
+  OwnedString mText;
 
 public:
-  explicit Filter(const std::wstring& text);
+  enum Type
+  {
+    UNKNOWN = 0,
+    INVALID = 1,
+    COMMENT = 2,
+    BLOCKING = 3,
+    WHITELIST = 4,
+    ELEMHIDE = 5,
+    ELEMHIDEEXCEPTION = 6,
+    CSSPROPERTY = 7,
+  };
+
+  explicit Filter(Type type, const String& text);
+  ~Filter();
+
+  Type mType;
 
   /* TODO
-  std::vector<Subscription> subscriptions;
+  std::vector<Subscription> mSubscriptions;
   */
 
-  const std::wstring GetText() const
+  EMSCRIPTEN_KEEPALIVE const String& GetText() const
   {
-    return text;
+    return mText;
   }
 
-  enum Type
-  {
-    UNKNOWN,
-    INVALID,
-    COMMENT,
-    BLOCKING,
-    WHITELIST,
-    ELEMHIDE,
-    ELEMHIDEEXCEPTION,
-    CSSPROPERTY,
-  };
+  EMSCRIPTEN_KEEPALIVE OwnedString Serialize() const;
 
-  virtual Type GetType() const = 0;
-
-  virtual const std::wstring Serialize();
-
-  static FilterPtr FromText(const std::wstring& text);
-  static const std::wstring Normalize(const std::wstring& text);
+  static EMSCRIPTEN_KEEPALIVE Filter* FromText(DependentString& text);
 };
 
-#endif
+typedef intrusive_ptr<Filter> FilterPtr;