Line data    Source code

       1              : /* valaregexliteral.vala
       2              :  *
       3              :  * Copyright (C) 2010  Jukka-Pekka Iivonen
       4              :  * Copyright (C) 2010  Jürg Billeter
       5              :  *
       6              :  * This library is free software; you can redistribute it and/or
       7              :  * modify it under the terms of the GNU Lesser General Public
       8              :  * License as published by the Free Software Foundation; either
       9              :  * version 2.1 of the License, or (at your option) any later version.
      10              : 
      11              :  * This library is distributed in the hope that it will be useful,
      12              :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13              :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14              :  * Lesser General Public License for more details.
      15              : 
      16              :  * You should have received a copy of the GNU Lesser General Public
      17              :  * License along with this library; if not, write to the Free Software
      18              :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
      19              :  *
      20              :  * Author:
      21              :  *      Jukka-Pekka Iivonen <jp0409@jippii.fi>
      22              :  */
      23              : 
      24              : using GLib;
      25              : 
      26              : /**
      27              :  * Represents a regular expression literal in the source code.
      28              :  */
      29           17 : public class Vala.RegexLiteral : Literal {
      30              :         /**
      31              :          * The literal value.
      32              :          */
      33          114 :         public string value { get; private set; }
      34              : 
      35              :         /**
      36              :          * Creates a new regular expression literal.
      37              :          *
      38              :          * @param value             the literal value
      39              :          * @param source_reference  reference to source code
      40              :          * @return                  newly created string literal
      41              :          */
      42           93 :         public RegexLiteral (string value, SourceReference? source_reference = null) {
      43           31 :                 this.value = value;
      44           31 :                 this.source_reference = source_reference;
      45              :         }
      46              : 
      47           69 :         public override void accept (CodeVisitor visitor) {
      48           69 :                 visitor.visit_regex_literal (this);
      49              : 
      50           69 :                 visitor.visit_expression (this);
      51              :         }
      52              : 
      53            0 :         public override bool is_pure () {
      54            0 :                 return true;
      55              :         }
      56              : 
      57           21 :         public override bool is_non_null () {
      58           21 :                 return true;
      59              :         }
      60              : 
      61            0 :         public override string to_string () {
      62            0 :                 return value;
      63              :         }
      64              : 
      65           22 :         public override bool check (CodeContext context) {
      66           22 :                 if (checked) {
      67            1 :                         return !error;
      68              :                 }
      69              : 
      70           21 :                 checked = true;
      71              : 
      72           21 :                 try {
      73           21 :                         var regex = new GLib.Regex (value);
      74           21 :                         if (regex != null) { /* Regex is valid. */ }
      75              :                 } catch (RegexError err) {
      76            0 :                         error = true;
      77            0 :                         Report.error (source_reference, "Invalid regular expression `%s'.", value);
      78            0 :                         return false;
      79              :                 }
      80              : 
      81           21 :                 value_type = context.analyzer.regex_type.copy ();
      82              : 
      83           21 :                 return !error;
      84              :         }
      85              : 
      86           21 :         public override void emit (CodeGenerator codegen) {
      87           21 :                 codegen.visit_regex_literal (this);
      88              : 
      89           21 :                 codegen.visit_expression (this);
      90              :         }
      91              : }
      92              :