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

compiled/Filter.h

+#ifndef ADBLOCK_PLUS_FILTER_H
+#define ADBLOCK_PLUS_FILTER_H
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "debug.h"
+
+class Filter;
+
+typedef std::shared_ptr<Filter> FilterPtr;
+
+class Filter : public std::enable_shared_from_this<Filter> 
+{
+private:
+  std::u16string text;
+
+public:
+  explicit Filter(const std::u16string& text);
+  virtual ~Filter() {}
+
+  /* TODO
+  std::vector<Subscription> subscriptions;
+  */
+
+  const std::u16string GetText() const
+  {
+    return text;
+  }
+
+  enum Type
+  {
+    UNKNOWN = 0,
+    INVALID = 1,
+    COMMENT = 2,
+    BLOCKING = 3,
+    WHITELIST = 4,
+    ELEMHIDE = 5,
+    ELEMHIDEEXCEPTION = 6,
+    CSSPROPERTY = 7,
+  };
+
+  virtual Type GetType() const = 0;
+
+  virtual const std::u16string Serialize();
+
+  static FilterPtr FromText(const std::u16string& text);
+  static const std::u16string Normalize(const std::u16string& text);
+};
+
+#endif