/Microsoft.Scripting/Actions/Calls/ParameterBinder.cs

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

 *

 * Copyright (c) Microsoft Corporation. 

 *

 * This source code is subject to terms and conditions of the Microsoft Public License. A 

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

 * you cannot locate the  Microsoft Public License, 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 Microsoft Public License.

 *

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

 *

 *

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



#if CODEPLEX_40

using System;

#else

using System; using Microsoft;

#endif

using System.Collections.Generic;

#if CODEPLEX_40

using System.Dynamic;

using System.Linq.Expressions;

#else

using Microsoft.Scripting;

using Microsoft.Linq.Expressions;

#endif

using System.Reflection;

using Microsoft.Scripting.Utils;



namespace Microsoft.Scripting.Actions.Calls {

    /// <summary>

    /// Helper class for emitting calls via the MethodBinder.

    /// </summary>

    public class ParameterBinder {

        private readonly ActionBinder _actionBinder;

        private List<ParameterExpression> _temps;



        public ParameterBinder(ActionBinder actionBinder) {

            Assert.NotNull(actionBinder);



            _actionBinder = actionBinder;

        }



        public ActionBinder Binder {

            get { return _actionBinder; }

        }



        internal List<ParameterExpression> Temps {

            get { return _temps; }

        }



        internal ParameterExpression GetTemporary(Type type, string name) {

            Assert.NotNull(type);



            if (_temps == null) {

                _temps = new List<ParameterExpression>();

            }



            ParameterExpression res = Expression.Variable(type, name);

            _temps.Add(res);

            return res;

        }



        public virtual Expression ConvertExpression(Expression expr, ParameterInfo info, Type toType) {

            Assert.NotNull(expr, toType);



            return _actionBinder.ConvertExpression(expr, toType, ConversionResultKind.ExplicitCast, null);

        }



        public virtual Func<object[], object> ConvertObject(int index, DynamicMetaObject knownType, ParameterInfo info, Type toType) {

            throw new NotImplementedException();

        }



        public virtual Expression GetDynamicConversion(Expression value, Type type) {

            return Expression.Dynamic(OldConvertToAction.Make(_actionBinder, type), type, value);

        }

    }



}