ccode/valaccodeconstant.vala

   1 /* valaccodeconstant.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  * A constant C expression.
  27  */
  28 public class Vala.CCodeConstant : CCodeExpression {
  29         /**
  30          * The name of this constant.
  31          */
  32         public string name { get; set; }
  33
  34         public CCodeConstant (string _name) {
  35                 name = _name;
  36         }
  37
  38         const int LINE_LENGTH = 70;
  39
  40         public CCodeConstant.string (string _name) {
  41                 assert (_name[0] == '\"');
  42
  43                 if (_name.length <= LINE_LENGTH) {
  44                         name = _name;
  45                         return;
  46                 }
  47
  48                 var builder = new StringBuilder ("\"");
  49
  50                 char* p = _name;
  51                 char* end = p + _name.length;
  52
  53                 // remove quotes
  54                 p++;
  55                 end--;
  56
  57                 int col = 0;
  58                 while (p < end) {
  59                         if (col >= LINE_LENGTH) {
  60                                 builder.append ("\" \\\n\"");
  61                                 col = 0;
  62                         }
  63                         if (*p == '\\') {
  64                                 char* begin_of_char = p;
  65
  66                                 builder.append_c (p[0]);
  67                                 builder.append_c (p[1]);
  68                                 p += 2;
  69                                 switch (p[-1]) {
  70                                 case 'x':
  71                                         // hexadecimal character
  72                                         while (p < end && p->isxdigit ()) {
  73                                                 builder.append_c (*p);
  74                                                 p++;
  75                                         }
  76                                         break;
  77                                 case 'n':
  78                                         // break line at \n
  79                                         col = LINE_LENGTH;
  80                                         break;
  81                                 }
  82                                 col += (int) (p - begin_of_char);
  83                         } else {
  84                                 builder.append_unichar (((string) p).get_char ());
  85                                 p += ((char*) ((string) p).next_char () - p);
  86                                 col++;
  87                         }
  88                 }
  89
  90                 builder.append_c ('"');
  91
  92                 this.name = builder.str;
  93         }
  94
  95         public override void write (CCodeWriter writer) {
  96                 writer.write_string (name);
  97         }
  98 }