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

compiled/Filter.h

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