vala/valastringliteral.vala

   1 /* valastringliteral.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 string literal in the source code.
  27  */
  28 public class Vala.StringLiteral : Literal {
  29         /**
  30          * The literal value.
  31          */
  32         public string value { get; set; }
  33
  34         /**
  35          * Creates a new string literal.
  36          *
  37          * @param s      the literal value
  38          * @param source reference to source code
  39          * @return       newly created string literal
  40          */
  41         public StringLiteral (string value, SourceReference? source_reference = null) {
  42                 this.value = value;
  43                 this.source_reference = source_reference;
  44         }
  45
  46         /**
  47          * Evaluates the literal string value.
  48          *
  49          * @return the unescaped string
  50          */
  51         public string? eval () {
  52                 if (value == null) {
  53                         return null;
  54                 }
  55
  56                 /* remove quotes */
  57                 var noquotes = value.substring (1, (uint) (value.length - 2));
  58                 /* unescape string */
  59                 return noquotes.compress ();
  60         }
  61
  62         public override void accept (CodeVisitor visitor) {
  63                 visitor.visit_string_literal (this);
  64
  65                 visitor.visit_expression (this);
  66         }
  67
  68         public override bool is_pure () {
  69                 return true;
  70         }
  71
  72         public override bool is_non_null () {
  73                 return true;
  74         }
  75
  76         public override string to_string () {
  77                 return value;
  78         }
  79
  80         public override bool check (CodeContext context) {
  81                 if (checked) {
  82                         return !error;
  83                 }
  84
  85                 checked = true;
  86
  87                 value_type = context.analyzer.string_type.copy ();
  88
  89                 return !error;
  90         }
  91
  92         public override void emit (CodeGenerator codegen) {
  93                 codegen.visit_string_literal (this);
  94
  95                 codegen.visit_expression (this);
  96         }
  97 }