libobjc/Protocol.m

   1 /* This file contains the implementation of class Protocol.
   2    Copyright (C) 1993 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC 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
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* As a special exception, if you link this library with files
  22    compiled with GCC to produce an executable, this does not cause
  23    the resulting executable to be covered by the GNU General Public License.
  24    This exception does not however invalidate any other reasons why
  25    the executable file might be covered by the GNU General Public License.  */
  26
  27 #include "objc/Protocol.h"
  28 #include "objc/objc-api.h"
  29
  30 /* Method description list */
  31 struct objc_method_description_list {
  32         int count;
  33         struct objc_method_description list[1];
  34 };
  35
  36
  37 @implementation Protocol
  38 {
  39 @private
  40         char *protocol_name;
  41         struct objc_protocol_list *protocol_list;
  42         struct objc_method_description_list *instance_methods, *class_methods;
  43 }
  44
  45 /* Obtaining attributes intrinsic to the protocol */
  46
  47 - (const char *)name
  48 {
  49   return protocol_name;
  50 }
  51
  52 /* Testing protocol conformance */
  53
  54 - (BOOL) conformsTo: (Protocol *)aProtocolObject
  55 {
  56   int i;
  57   struct objc_protocol_list* proto_list;
  58
  59   if (!strcmp(aProtocolObject->protocol_name, self->protocol_name))
  60     return YES;
  61
  62   for (proto_list = protocol_list; proto_list; proto_list = proto_list->next)
  63     {
  64       for (i=0; i < proto_list->count; i++)
  65         {
  66           if ([proto_list->list[i] conformsTo: aProtocolObject])
  67             return YES;
  68         }
  69     }
  70
  71   return NO;
  72 }
  73
  74 /* Looking up information specific to a protocol */
  75
  76 - (struct objc_method_description *) descriptionForInstanceMethod:(SEL)aSel
  77 {
  78   int i;
  79   struct objc_protocol_list* proto_list;
  80   const char* name = sel_get_name (aSel);
  81   struct objc_method_description *result;
  82
  83   for (i = 0; i < instance_methods->count; i++)
  84     {
  85       if (!strcmp ((char*)instance_methods->list[i].name, name))
  86         return &(instance_methods->list[i]);
  87     }
  88
  89   for (proto_list = protocol_list; proto_list; proto_list = proto_list->next)
  90     {
  91       for (i=0; i < proto_list->count; i++)
  92         {
  93           if ((result = [proto_list->list[i]
  94                          descriptionForInstanceMethod: aSel]))
  95             return result;
  96         }
  97     }
  98
  99   return NULL;
 100 }
 101
 102 - (struct objc_method_description *) descriptionForClassMethod:(SEL)aSel;
 103 {
 104   int i;
 105   struct objc_protocol_list* proto_list;
 106   const char* name = sel_get_name (aSel);
 107   struct objc_method_description *result;
 108
 109   for (i = 0; i < class_methods->count; i++)
 110     {
 111       if (!strcmp ((char*)class_methods->list[i].name, name))
 112         return &(class_methods->list[i]);
 113     }
 114
 115   for (proto_list = protocol_list; proto_list; proto_list = proto_list->next)
 116     {
 117       for (i=0; i < proto_list->count; i++)
 118         {
 119           if ((result = [proto_list->list[i]
 120                          descriptionForClassMethod: aSel]))
 121             return result;
 122         }
 123     }
 124
 125   return NULL;
 126 }
 127
 128 @end