Parse class attributes (shared, abstract, final, external), cleanup some parser code.

src/CoreData/ClassAttr.hpp

@@ -0,0 +1,25 @@
+#ifndef MALACHSCRIPT_CLASSATTR_HPP
+#define MALACHSCRIPT_CLASSATTR_HPP
+
+namespace MalachScript {
+    enum class ClassAttr : uint8_t {
+        None = 0,
+        Shared = 1 << 1,
+        Abstract = 1 << 2,
+        Final = 1 << 3,
+        External = 1 << 4,
+    };
+
+    class ClassAttrHelpers {
+    public:
+        constexpr inline static bool Contains(ClassAttr set, ClassAttr flag) {
+            return (static_cast<uint8_t>(set) & static_cast<uint8_t>(flag)) != 0;
+        }
+        constexpr inline static ClassAttr Set(ClassAttr set, ClassAttr flag) {
+            return static_cast<ClassAttr>(static_cast<uint8_t>(set) | static_cast<uint8_t>(flag));
+        }
+    };
+
+}
+
+#endif // MALACHSCRIPT_CLASSATTR_HPP