/IronPython_Main/Languages/IronPython/IronPython/Compiler/Ast/Arg.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 MSAst = System.Linq.Expressions;

#else

using MSAst = Microsoft.Scripting.Ast;

#endif



using IronPython.Runtime;

using Microsoft.Scripting;

using Microsoft.Scripting.Actions;



namespace IronPython.Compiler.Ast {

    public class Arg : Node {

        private readonly string _name;

        private readonly Expression _expression;



        public Arg(Expression expression) : this(null, expression) { }



        public Arg(string name, Expression expression) {

            _name = name;

            _expression = expression;

        }



        public string Name {

            get { return _name; }

        }



        public Expression Expression {

            get { return _expression; }

        } 



        public override string ToString() {

            return base.ToString() + ":" + _name;

        }



        internal Argument GetArgumentInfo() {

            if (_name == null) {

                return Argument.Simple;

            } else if (_name == "*") {

                return new Argument(ArgumentType.List);

            } else if (_name == "**") {

                return new Argument(ArgumentType.Dictionary);

            } else {

                return new Argument(_name);

            }

        }



        public override void Walk(PythonWalker walker) {

            if (walker.Walk(this)) {

                if (_expression != null) {

                    _expression.Walk(walker);

                }

            }

            walker.PostWalk(this);

        }

    }

}