ccode/valaccodefunctiondeclarator.vala

   1 /* valaccodefunctiondeclarator.vala
   2  *
   3  * Copyright (C) 2006-2007  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 function pointer declarator in the C code.
  27  */
  28 public class Vala.CCodeFunctionDeclarator : CCodeDeclarator {
  29         /**
  30          * The declarator name.
  31          */
  32         public string name { get; set; }
  33
  34         private List<CCodeParameter> parameters = new ArrayList<CCodeParameter> ();
  35
  36         public CCodeFunctionDeclarator (string name) {
  37                 this.name = name;
  38         }
  39
  40         /**
  41          * Appends the specified parameter to the list of function parameters.
  42          *
  43          * @param param a formal parameter
  44          */
  45         public void add_parameter (CCodeParameter param) {
  46                 parameters.add (param);
  47         }
  48
  49         public override void write (CCodeWriter writer) {
  50                 write_declaration (writer);
  51         }
  52
  53         public override void write_declaration (CCodeWriter writer) {
  54                 writer.write_string ("(*");
  55                 writer.write_string (name);
  56                 writer.write_string (") (");
  57
  58                 bool has_args = (CCodeModifiers.PRINTF in modifiers || CCodeModifiers.SCANF in modifiers);
  59                 int i = 0;
  60                 int format_arg_index = -1;
  61                 int args_index = -1;
  62                 foreach (CCodeParameter param in parameters) {
  63                         if (i > 0) {
  64                                 writer.write_string (", ");
  65                         }
  66                         param.write (writer);
  67                         if (CCodeModifiers.FORMAT_ARG in param.modifiers) {
  68                                 format_arg_index = i;
  69                         }
  70                         if (has_args && param.ellipsis) {
  71                                 args_index = i;
  72                         } else if (has_args && param.type_name == "va_list" && format_arg_index < 0) {
  73                                 format_arg_index = i - 1;
  74                         }
  75                         i++;
  76                 }
  77
  78                 writer.write_string (")");
  79
  80                 if (CCodeModifiers.DEPRECATED in modifiers) {
  81                         writer.write_string (" G_GNUC_DEPRECATED");
  82                 }
  83
  84                 if (CCodeModifiers.PRINTF in modifiers) {
  85                         format_arg_index = (format_arg_index >= 0 ? format_arg_index + 1 : args_index);
  86                         writer.write_string (" G_GNUC_PRINTF(%d,%d)".printf (format_arg_index, args_index + 1));
  87                 } else if (CCodeModifiers.SCANF in modifiers) {
  88                         format_arg_index = (format_arg_index >= 0 ? format_arg_index + 1 : args_index);
  89                         writer.write_string (" G_GNUC_SCANF(%d,%d)".printf (format_arg_index, args_index + 1));
  90                 } else if (format_arg_index >= 0) {
  91                         writer.write_string (" G_GNUC_FORMAT(%d)".printf (format_arg_index + 1));
  92                 }
  93         }
  94 }