vala/valarealliteral.vala

   1 /* valarealliteral.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 real literal in the source code.
  27  */
  28 public class Vala.RealLiteral : Literal {
  29         /**
  30          * The literal value.
  31          */
  32         public string value { get; set; }
  33
  34         /**
  35          * Creates a new real literal.
  36          *
  37          * @param r      literal value
  38          * @param source reference to source code
  39          * @return       newly created real literal
  40          */
  41         public RealLiteral (string r, SourceReference? source = null) {
  42                 value = r;
  43                 source_reference = source;
  44         }
  45
  46         public override void accept (CodeVisitor visitor) {
  47                 visitor.visit_real_literal (this);
  48
  49                 visitor.visit_expression (this);
  50         }
  51
  52         /**
  53          * Returns the type name of the value this literal represents.
  54          *
  55          * @return the name of literal type
  56          */
  57         public string get_type_name () {
  58                 if (value.has_suffix ("f") || value.has_suffix ("F")) {
  59                         return "float";
  60                 }
  61
  62                 return "double";
  63         }
  64
  65         public override bool is_pure () {
  66                 return true;
  67         }
  68
  69         public override string to_string () {
  70                 return value;
  71         }
  72
  73         public override bool check (CodeContext context) {
  74                 if (checked) {
  75                         return !error;
  76                 }
  77
  78                 checked = true;
  79
  80                 var st = (Struct) context.analyzer.root_symbol.scope.lookup (get_type_name ());
  81                 // ensure attributes are already processed
  82                 st.check (context);
  83
  84                 value_type = new FloatingType (st);
  85
  86                 return !error;
  87         }
  88
  89         public override void emit (CodeGenerator codegen) {
  90                 codegen.visit_real_literal (this);
  91
  92                 codegen.visit_expression (this);
  93         }
  94 }