/IronPython_Main/Languages/IronPython/IronPython/Runtime/Binding/PythonDeleteSliceBinder.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 

 * dlr@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.

 *

 *

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



#if !CLR2

using System.Linq.Expressions;

#else

using Microsoft.Scripting.Ast;

#endif



using System;

using System.Dynamic;



using Microsoft.Scripting.Runtime;

using Microsoft.Scripting.Utils;



using IronPython.Runtime.Operations;



namespace IronPython.Runtime.Binding {

    using Ast = Expression;



    class PythonDeleteSliceBinder : DynamicMetaObjectBinder, IPythonSite, IExpressionSerializable {

        private readonly PythonContext/*!*/ _context;



        public PythonDeleteSliceBinder(PythonContext/*!*/ context) {

            _context = context;

        }



        public override DynamicMetaObject Bind(DynamicMetaObject target, DynamicMetaObject[] args) {

            return PythonProtocol.Index(this, PythonIndexType.DeleteSlice, ArrayUtils.Insert(target, args));

        }



        public override int GetHashCode() {

            return base.GetHashCode() ^ _context.Binder.GetHashCode();

        }



        public override bool Equals(object obj) {

            PythonDeleteSliceBinder ob = obj as PythonDeleteSliceBinder;

            if (ob == null) {

                return false;

            }



            return ob._context.Binder == _context.Binder && base.Equals(obj);

        }



        #region IPythonSite Members



        public PythonContext/*!*/ Context {

            get { return _context; }

        }



        #endregion



        #region IExpressionSerializable Members



        public Expression/*!*/ CreateExpression() {

            return Ast.Call(

                typeof(PythonOps).GetMethod("MakeDeleteSliceBinder"),

                BindingHelpers.CreateBinderStateExpression()

            );

        }



        #endregion

    }

}