/IronPython_Main/Languages/Ruby/Libraries.LCA_RESTRICTED/Builtins/ClassOps.cs

/* ****************************************************************************

 *

 * Copyright (c) Microsoft Corporation. 

 *

 * This source code is subject to terms and conditions of the Apache License, Version 2.0. A 

 * copy of the license can be found in the License.html file at the root of this distribution. If 

 * you cannot locate the  Apache License, Version 2.0, please send an email to 

 * ironruby@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 

 * by the terms of the Apache License, Version 2.0.

 *

 * You must not remove this notice, or any other, from this software.

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using System.Diagnostics;

using System.Runtime.InteropServices;

using IronRuby.Runtime;

using IronRuby.Runtime.Calls;

using Microsoft.Scripting.Runtime;



namespace IronRuby.Builtins {



    [RubyClass("Class", Extends = typeof(RubyClass), Inherits = typeof(RubyModule), Restrictions = ModuleRestrictions.Builtin | ModuleRestrictions.NoUnderlyingType)]

    [UndefineMethod("extend_object")]

    [UndefineMethod("append_features")]

    [UndefineMethod("module_function")]

    public sealed class ClassOps {

        #region initialize, initialize_copy, allocate, new, superclass, inherited



        // factory defined in on RubyClass



        // Reinitialization. Not called when a factory/non-default ctor is called.

        [RubyMethod("initialize", RubyMethodAttributes.PrivateInstance)]

        public static void Reinitialize(BlockParam body, RubyClass/*!*/ self, [Optional]RubyClass superClass) {

            // Class cannot be subclassed, so this can only be called directly on an already initialized class:

            throw RubyExceptions.CreateTypeError("already initialized class");

        }



        [RubyMethod("initialize_copy", RubyMethodAttributes.PrivateInstance)]

        public static void InitializeCopy(RubyClass/*!*/ self, [NotNull]RubyClass/*!*/ other) {

            self.InitializeClassCopy(other);

        }

        

        [RubyMethod("allocate")]

        public static RuleGenerator/*!*/ Allocate() {

            return new RuleGenerator(RuleGenerators.InstanceAllocator);

        }



        [RubyMethod("new")]

        public static RuleGenerator/*!*/ New() {

            return new RuleGenerator(RuleGenerators.InstanceConstructor);

        }



        [RubyMethod("superclass")]

        public static RubyClass GetSuperclass(RubyClass/*!*/ self) {

            if (self.IsSingletonClass) {

                RubyClass result = self.ImmediateClass;

                Debug.Assert(result.IsSingletonClass);



                // do not return dummy singletons, also do not create a new singleton (MRI does):

                return result.IsDummySingletonClass ? self : result;

            } else {

                return self.SuperClass;

            }

        }



        [RubyMethod("inherited", RubyMethodAttributes.PrivateInstance | RubyMethodAttributes.Empty)]

        public static void Inherited(object/*!*/ self, object subclass) {

            // nop

        }



        #endregion



        #region IronRuby: clr_new, clr_ctor



        [RubyMethod("clr_new")]

        public static RuleGenerator/*!*/ ClrNew() {

            return (metaBuilder, args, name) => ((RubyClass)args.Target).BuildClrObjectConstruction(metaBuilder, args, name);

        }



        [RubyMethod("clr_ctor")]

        [RubyMethod("clr_constructor")]

        public static RubyMethod/*!*/ GetClrConstructor(RubyClass/*!*/ self) {

            RubyMemberInfo info;



            if (self.TypeTracker == null) {

                throw RubyExceptions.CreateNotClrTypeError(self);

            }



            if (!self.TryGetClrConstructor(out info)) {

                throw RubyOps.MakeConstructorUndefinedError(self);

            }



            return new RubyMethod(self, info, ".ctor");

        }



        #endregion

    }

}