Line data    Source code

       1              : /* valastringliteral.vala
       2              :  *
       3              :  * Copyright (C) 2006-2011  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         1537 : public class Vala.StringLiteral : Literal {
      29              :         /**
      30              :          * The literal value.
      31              :          */
      32       290174 :         public string value { get; set; }
      33              : 
      34        13100 :         public bool translate { get; set; }
      35              : 
      36              :         /**
      37              :          * Creates a new string literal.
      38              :          *
      39              :          * @param value             the literal value
      40              :          * @param source_reference  reference to source code
      41              :          * @return                  newly created string literal
      42              :          */
      43       277113 :         public StringLiteral (string value, SourceReference? source_reference = null) {
      44        92371 :                 this.value = value;
      45        92371 :                 this.source_reference = source_reference;
      46              :         }
      47              : 
      48              :         /**
      49              :          * Evaluates the literal string value.
      50              :          *
      51              :          * @return the unescaped string
      52              :          */
      53         7638 :         public string? eval () {
      54         7638 :                 if (value == null) {
      55            0 :                         return null;
      56              :                 }
      57              : 
      58              :                 /* remove quotes */
      59         7638 :                 var noquotes = value.substring (1, (uint) (value.length - 2));
      60              :                 /* unescape string */
      61         7638 :                 return noquotes.compress ();
      62              :         }
      63              : 
      64       258827 :         public override void accept (CodeVisitor visitor) {
      65       258827 :                 visitor.visit_string_literal (this);
      66              : 
      67       258827 :                 visitor.visit_expression (this);
      68              :         }
      69              : 
      70            0 :         public override bool is_pure () {
      71            0 :                 return true;
      72              :         }
      73              : 
      74        13216 :         public override bool is_non_null () {
      75        13216 :                 return true;
      76              :         }
      77              : 
      78            0 :         public override string to_string () {
      79            0 :                 return value;
      80              :         }
      81              : 
      82       110230 :         public override bool check (CodeContext context) {
      83       110230 :                 if (checked) {
      84        23846 :                         return !error;
      85              :                 }
      86              : 
      87        86384 :                 checked = true;
      88              : 
      89        86384 :                 value_type = context.analyzer.string_type.copy ();
      90              : 
      91        86384 :                 return !error;
      92              :         }
      93              : 
      94        13016 :         public override void emit (CodeGenerator codegen) {
      95        13016 :                 codegen.visit_string_literal (this);
      96              : 
      97        13016 :                 codegen.visit_expression (this);
      98              :         }
      99              : 
     100         7568 :         public static StringLiteral? get_format_literal (Expression expr) {
     101         7568 :                 unowned StringLiteral? format_literal = expr as StringLiteral;
     102         7466 :                 if (format_literal != null) {
     103         7466 :                         return format_literal;
     104              :                 }
     105              : 
     106          102 :                 unowned MethodCall? call = expr as MethodCall;
     107           11 :                 if (call != null) {
     108           11 :                         return call.get_format_literal ();
     109              :                 }
     110              : 
     111         7568 :                 return null;
     112              :         }
     113              : }