Line data    Source code

       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           62 : public class Vala.RealLiteral : Literal {
      29              :         /**
      30              :          * The literal value.
      31              :          */
      32         1544 :         public string value { get; private 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         1218 :         public RealLiteral (string r, SourceReference? source = null) {
      42          406 :                 value = r;
      43          406 :                 source_reference = source;
      44              :         }
      45              : 
      46         1275 :         public override void accept (CodeVisitor visitor) {
      47         1275 :                 visitor.visit_real_literal (this);
      48              : 
      49         1275 :                 visitor.visit_expression (this);
      50              :         }
      51              : 
      52            0 :         public override bool is_pure () {
      53            0 :                 return true;
      54              :         }
      55              : 
      56            0 :         public override string to_string () {
      57            0 :                 return value;
      58              :         }
      59              : 
      60          603 :         public override bool check (CodeContext context) {
      61          603 :                 if (checked) {
      62          199 :                         return !error;
      63              :                 }
      64              : 
      65          404 :                 checked = true;
      66              : 
      67              :                 string type_name;
      68          404 :                 int suf_len = 0;
      69              : 
      70          404 :                 switch (value[value.length - 1]) {
      71              :                 case 'f':
      72              :                 case 'F':
      73          101 :                         suf_len = 1;
      74          101 :                         type_name = "float";
      75          101 :                         break;
      76              :                 case 'd':
      77              :                 case 'D':
      78           26 :                         suf_len = 1;
      79           26 :                         type_name = "double";
      80           26 :                         break;
      81              :                 default:
      82          277 :                         type_name = "double";
      83          277 :                         break;
      84              :                 }
      85              : 
      86          404 :                 switch (value[value.length - suf_len - 1]) {
      87              :                 case 'e':
      88              :                 case 'E':
      89              :                 case 'p':
      90              :                 case 'P':
      91              :                 case '+':
      92              :                 case '-':
      93            5 :                         Report.error (source_reference, "exponent has no digits");
      94            5 :                         error = true;
      95            5 :                         break;
      96              :                 }
      97              : 
      98          404 :                 var st = (Struct) context.root.scope.lookup (type_name);
      99              :                 // ensure attributes are already processed
     100          404 :                 st.check (context);
     101              : 
     102          404 :                 value_type = new FloatingType (st);
     103              : 
     104          404 :                 return !error;
     105              :         }
     106              : 
     107          321 :         public override void emit (CodeGenerator codegen) {
     108          321 :                 codegen.visit_real_literal (this);
     109              : 
     110          321 :                 codegen.visit_expression (this);
     111              :         }
     112              : }