Implemented prototype chain

Author: FlorianRappl

src/AngleSharp.Scripting.JavaScript/DomNodeInstance.cs

@@ -19,14 +19,14 @@ public DomNodeInstance(EngineInstance engine, Object value)
             Prototype = engine.GetDomPrototype(value.GetType());
         }
 
-        public Object Value
+        public override String Class
         {
-            get { return _value; }
+            get { return Prototype.Class; }
         }
 
-        public override String ToString()
+        public Object Value
         {
-            return Prototype.ToString();
+            get { return _value; }
         }
 
         public override PropertyDescriptor GetOwnProperty(String propertyName)

src/AngleSharp.Scripting.JavaScript/DomPrototypeInstance.cs

@@ -22,21 +22,22 @@ sealed class DomPrototypeInstance : ObjectInstance
         public DomPrototypeInstance(EngineInstance engine, Type type)
             : base(engine.Jint)
         {
+            var baseType = type.GetTypeInfo().BaseType;
             _type = type;
-            _name = String.Format("[object {0}]", type.Name);
+            _name = type.GetOfficialName(baseType);
             _engine = engine;
 
             SetAllMembers();
             SetPseudoProperties();
 
             //  DOM objects can have properties added dynamically
             Extensible = true;
-            Prototype = engine.GetDomPrototype(type.GetTypeInfo().BaseType);
+            Prototype = engine.GetDomPrototype(baseType);
         }
-        
-        public override String ToString()
+
+        public override String Class
         {
-            return _name;
+            get { return _name; }
         }
 
         public Boolean TryGetFromIndex(Object value, String index, out PropertyDescriptor result)

src/AngleSharp.Scripting.JavaScript/Extensions.cs

@@ -320,5 +320,24 @@ public static String GetOfficialName(this MemberInfo member)
             var officalNameAttribute = names.FirstOrDefault();
             return officalNameAttribute != null ? officalNameAttribute.OfficialName : member.Name;
         }
+
+        public static String GetOfficialName(this Type currentType, Type baseType)
+        {
+            var ti = currentType.GetTypeInfo();
+            var name = ti.GetCustomAttribute<DomNameAttribute>(true)?.OfficialName;
+
+            if (name == null)
+            {
+                foreach (var impl in ti.ImplementedInterfaces.Except(baseType.GetTypeInfo().ImplementedInterfaces))
+                {
+                    name = impl.GetTypeInfo().GetCustomAttribute<DomNameAttribute>(false)?.OfficialName;
+
+                    if (name != null)
+                        break;
+                }
+            }
+
+            return name ?? currentType.Name;
+        }
     }
 }

src/AngleSharp.Scripting.JavaScript/PrototypeCache.cs

@@ -8,11 +8,13 @@
     sealed class PrototypeCache
     {
         private readonly Dictionary<Type, ObjectInstance> _prototypes;
+        private readonly Engine _engine;
 
         public PrototypeCache(Engine engine)
         {
             _prototypes = new Dictionary<Type, ObjectInstance>();
-            _prototypes.Add(typeof(Object), engine.Object);
+            _prototypes.Add(typeof(Object), engine.Object.PrototypeObject);
+            _engine = engine;
         }
 
         public ObjectInstance GetOrCreate(Type type, Func<Type, ObjectInstance> creator)