vala/valadostatement.vala

   1 /* valadostatement.vala
   2  *
   3  * Copyright (C) 2006-2008  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 using GLib;
  24
  25 /**
  26  * Represents a do iteration statement in the source code.
  27  */
  28 public class Vala.DoStatement : CodeNode, Statement {
  29         /**
  30          * Specifies the loop body.
  31          */
  32         public Block body {
  33                 get {
  34                         return _body;
  35                 }
  36                 set {
  37                         _body = value;
  38                         _body.parent_node = this;
  39                 }
  40         }
  41
  42         /**
  43          * Specifies the loop condition.
  44          */
  45         public Expression condition {
  46                 get {
  47                         return _condition;
  48                 }
  49                 set {
  50                         _condition = value;
  51                         _condition.parent_node = this;
  52                 }
  53         }
  54
  55         private Expression _condition;
  56         private Block _body;
  57
  58         /**
  59          * Creates a new do statement.
  60          *
  61          * @param cond   loop condition
  62          * @param body   loop body
  63          * @param source reference to source code
  64          * @return       newly created do statement
  65          */
  66         public DoStatement (Block body, Expression condition, SourceReference? source_reference = null) {
  67                 this.condition = condition;
  68                 this.source_reference = source_reference;
  69                 this.body = body;
  70         }
  71
  72         public override void accept (CodeVisitor visitor) {
  73                 visitor.visit_do_statement (this);
  74         }
  75
  76         public override void accept_children (CodeVisitor visitor) {
  77                 body.accept (visitor);
  78
  79                 condition.accept (visitor);
  80
  81                 visitor.visit_end_full_expression (condition);
  82         }
  83
  84         public override void replace_expression (Expression old_node, Expression new_node) {
  85                 if (condition == old_node) {
  86                         condition = new_node;
  87                 }
  88         }
  89
  90         public override bool check (SemanticAnalyzer analyzer) {
  91                 if (checked) {
  92                         return !error;
  93                 }
  94
  95                 checked = true;
  96
  97                 body.check (analyzer);
  98
  99                 if (!condition.check (analyzer)) {
 100                         /* if there was an error in the condition, skip this check */
 101                         error = true;
 102                         return false;
 103                 }
 104
 105                 if (!condition.value_type.compatible (analyzer.bool_type)) {
 106                         error = true;
 107                         Report.error (condition.source_reference, "Condition must be boolean");
 108                         return false;
 109                 }
 110
 111                 add_error_types (condition.get_error_types ());
 112                 add_error_types (body.get_error_types ());
 113
 114                 return !error;
 115         }
 116 }