vala/valabooleanliteral.vala

   1 /* valabooleanliteral.vala
   2  *
   3  * Copyright (C) 2006-2010  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 using GLib;
  24
  25 /**
  26  * Represents a literal boolean, i.e. true or false.
  27  */
  28 public class Vala.BooleanLiteral : Literal {
  29         /**
  30          * The literal value.
  31          */
  32         public bool value { get; set; }
  33
  34         /**
  35          * Creates a new boolean literal.
  36          *
  37          * @param b      boolean value
  38          * @param source reference to source code
  39          * @return       newly created boolean literal
  40          */
  41         public BooleanLiteral (bool b, SourceReference? source = null) {
  42                 value = b;
  43                 source_reference = source;
  44         }
  45
  46         public override void accept (CodeVisitor visitor) {
  47                 visitor.visit_boolean_literal (this);
  48
  49                 visitor.visit_expression (this);
  50         }
  51
  52         public override string to_string () {
  53                 if (value) {
  54                         return "true";
  55                 } else {
  56                         return "false";
  57                 }
  58         }
  59
  60         public override bool is_pure () {
  61                 return true;
  62         }
  63
  64         public override bool check (CodeContext context) {
  65                 if (checked) {
  66                         return !error;
  67                 }
  68
  69                 checked = true;
  70
  71                 value_type = context.analyzer.bool_type;
  72
  73                 return !error;
  74         }
  75
  76         public override void emit (CodeGenerator codegen) {
  77                 codegen.visit_boolean_literal (this);
  78
  79                 codegen.visit_expression (this);
  80         }
  81 }