Line data    Source code

       1              : /* valayieldstatement.vala
       2              :  *
       3              :  * Copyright (C) 2008-2010  Jürg Billeter
       4              :  *
       5              :  * This library is free software; you can redistribute it and/or
       6              :  * modify it under the terms of the GNU Lesser General Public
       7              :  * License as published by the Free Software Foundation; either
       8              :  * version 2.1 of the License, or (at your option) any later version.
       9              : 
      10              :  * This library is distributed in the hope that it will be useful,
      11              :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      12              :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13              :  * Lesser General Public License for more details.
      14              : 
      15              :  * You should have received a copy of the GNU Lesser General Public
      16              :  * License along with this library; if not, write to the Free Software
      17              :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
      18              :  *
      19              :  * Author:
      20              :  *      Jürg Billeter <j@bitron.ch>
      21              :  */
      22              : 
      23              : /**
      24              :  * Represents a yield statement in the source code.
      25              :  */
      26           26 : public class Vala.YieldStatement : CodeNode, Statement {
      27              :         /**
      28              :          * Creates a new yield statement.
      29              :          *
      30              :          * @param source_reference reference to source code
      31              :          * @return                 newly created yield statement
      32              :          */
      33           36 :         public YieldStatement (SourceReference? source_reference = null) {
      34           18 :                 this.source_reference = source_reference;
      35              :         }
      36              : 
      37           36 :         public override void accept (CodeVisitor visitor) {
      38           36 :                 visitor.visit_yield_statement (this);
      39              :         }
      40              : 
      41           18 :         public override bool check (CodeContext context) {
      42           18 :                 if (checked) {
      43            0 :                         return !error;
      44              :                 }
      45              : 
      46           18 :                 checked = true;
      47              : 
      48           18 :                 if (context.analyzer.current_method == null || !context.analyzer.current_method.coroutine) {
      49            1 :                         error = true;
      50            1 :                         Report.error (source_reference, "yield statement not available outside async method");
      51              :                 }
      52              : 
      53           18 :                 return !error;
      54              :         }
      55              : 
      56           17 :         public override void emit (CodeGenerator codegen) {
      57           17 :                 codegen.visit_yield_statement (this);
      58              :         }
      59              : }
      60              :