/IronPython_Main/Languages/Ruby/Ruby/Compiler/Ast/JumpStatements/RedoStatement.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 AstUtils = Microsoft.Scripting.Ast.Utils;



namespace IronRuby.Compiler.Ast {

    using Ast = MSA.Expression;

    

    public partial class RedoStatement : JumpStatement {

        public RedoStatement(SourceSpan location)

            : base(null, location) {

        }



        // see Ruby Language.doc/Runtime/Control Flow Implementation/Redo

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



            // eval:

            if (gen.CompilerOptions.IsEval) {

                return Methods.EvalRedo.OpCall(gen.CurrentScopeVariable);

            }



            // loop:

            if (gen.CurrentLoop != null) {

                return Ast.Block(

                    Ast.Assign(gen.CurrentLoop.RedoVariable, AstUtils.Constant(true)),

                    Ast.Continue(gen.CurrentLoop.ContinueLabel),

                    AstUtils.Empty()

                );

            }



            // block:

            if (gen.CurrentBlock != null) {

                return Ast.Continue(gen.CurrentBlock.RedoLabel);

            }



            // method:

            return Methods.MethodRedo.OpCall(gen.CurrentScopeVariable);

        }

    }

}