vala/valacharacterliteral.vala

   1 /* valacharacterliteral.vala
   2  *
   3  * Copyright (C) 2006-2009  Jürg Billeter, Raffaele Sandrini
   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  *      Raffaele Sandrini <raffaele@sandrini.ch>
  22  */
  23
  24 using GLib;
  25
  26 /**
  27  * Represents a single literal character.
  28  */
  29 public class Vala.CharacterLiteral : Literal {
  30         /**
  31          * The literal value.
  32          */
  33         public string value {
  34                 get {
  35                         return _value;
  36                 }
  37                 set {
  38                         _value = value;
  39
  40                         if (!value.validate () || (value.len () != 3 && value.next_char ().get_char () != '\\')) {
  41                                 error = true;
  42                         }
  43                 }
  44         }
  45
  46         private string _value;
  47
  48         /**
  49          * Creates a new character literal.
  50          *
  51          * @param c      character
  52          * @param source reference to source code
  53          * @return       newly created character literal
  54          */
  55         public CharacterLiteral (string c, SourceReference source) {
  56                 value = c;
  57                 source_reference = source;
  58
  59         }
  60
  61         public override void accept (CodeVisitor visitor) {
  62                 visitor.visit_character_literal (this);
  63
  64                 visitor.visit_expression (this);
  65         }
  66
  67         /**
  68          * Returns the unicode character value this character literal
  69          * represents.
  70          *
  71          * @return unicode character value
  72          */
  73         public unichar get_char () {
  74                 return value.next_char ().get_char ();
  75         }
  76
  77         public override bool is_pure () {
  78                 return true;
  79         }
  80
  81         public override bool check (SemanticAnalyzer analyzer) {
  82                 if (checked) {
  83                         return !error;
  84                 }
  85
  86                 checked = true;
  87
  88                 value_type = new IntegerType ((Struct) analyzer.root_symbol.scope.lookup ("char"));
  89
  90                 return !error;
  91         }
  92 }