/IronPython_Main/Languages/Ruby/Ruby/Compiler/Ast/Expressions/IsDefinedExpression.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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 * ***************************************************************************/



#if !CLR2

using MSA = System.Linq.Expressions;

#else

using MSA = Microsoft.Scripting.Ast;

#endif



using Microsoft.Scripting;

using Microsoft.Scripting.Utils;



namespace IronRuby.Compiler.Ast {

    public partial class IsDefinedExpression : Expression {

        private readonly Expression/*!*/ _expression;



        public Expression/*!*/ Expression {

            get { return _expression; }

        }



        public IsDefinedExpression(Expression/*!*/ expression, SourceSpan location)

            : base(location) {

            Assert.NotNull(expression);



            _expression = expression;

        }



        internal override MSA.Expression/*!*/ TransformRead(AstGenerator/*!*/ gen) {

            return _expression.TransformIsDefined(gen);

        }



        internal override MSA.Expression/*!*/ TransformReadBoolean(AstGenerator/*!*/ gen, bool positive) {

            return _expression.TransformBooleanIsDefined(gen, positive);

        }

    }

}