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Annotation of GNUtools/cc/objc/Protocol.m, revision 1.1

1.1     ! root        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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            19:  
        !            20: /* As a special exception, if you link this library with files
        !            21:    compiled with GCC to produce an executable, this does not cause
        !            22:    the resulting executable to be covered by the GNU General Public License.
        !            23:    This exception does not however invalidate any other reasons why
        !            24:    the executable file might be covered by the GNU General Public License.  */
        !            25: 
        !            26: #include "objc/Protocol.h"
        !            27: #include "objc/objc-api.h"
        !            28: 
        !            29: /* Method description list */
        !            30: struct objc_method_description_list {
        !            31:         int count;
        !            32:         struct objc_method_description list[1];
        !            33: };
        !            34: 
        !            35: 
        !            36: @implementation Protocol
        !            37: {
        !            38: @private
        !            39:         char *protocol_name;
        !            40:         struct objc_protocol_list *protocol_list;
        !            41:         struct objc_method_description_list *instance_methods, *class_methods; 
        !            42: }
        !            43: 
        !            44: /* Obtaining attributes intrinsic to the protocol */
        !            45: 
        !            46: - (const char *)name
        !            47: {
        !            48:   return protocol_name;
        !            49: }
        !            50: 
        !            51: /* Testing protocol conformance */
        !            52: 
        !            53: - (BOOL) conformsTo: (Protocol *)aProtocolObject
        !            54: {
        !            55:   int i;
        !            56:   struct objc_protocol_list* proto_list;
        !            57: 
        !            58:   if (!strcmp(aProtocolObject->protocol_name, self->protocol_name))
        !            59:     return YES;
        !            60: 
        !            61:   for (proto_list = protocol_list; proto_list; proto_list = proto_list->next)
        !            62:     {
        !            63:       for (i=0; i < proto_list->count; i++)
        !            64:        {
        !            65:          if ([proto_list->list[i] conformsTo: aProtocolObject])
        !            66:            return YES;
        !            67:        }
        !            68:     }
        !            69: 
        !            70:   return NO;
        !            71: }
        !            72: 
        !            73: /* Looking up information specific to a protocol */
        !            74: 
        !            75: - (struct objc_method_description *) descriptionForInstanceMethod:(SEL)aSel
        !            76: {
        !            77:   int i;
        !            78:   struct objc_protocol_list* proto_list;
        !            79:   const char* name = sel_get_name (aSel);
        !            80:   struct objc_method_description *result;
        !            81: 
        !            82:   for (i = 0; i < instance_methods->count; i++)
        !            83:     {
        !            84:       if (!strcmp ((char*)instance_methods->list[i].name, name))
        !            85:        return &(instance_methods->list[i]);
        !            86:     }
        !            87: 
        !            88:   for (proto_list = protocol_list; proto_list; proto_list = proto_list->next)
        !            89:     {
        !            90:       for (i=0; i < proto_list->count; i++)
        !            91:        {
        !            92:          if ((result = [proto_list->list[i]
        !            93:                         descriptionForInstanceMethod: aSel]))
        !            94:            return result;
        !            95:        }
        !            96:     }
        !            97: 
        !            98:   return NULL;
        !            99: }
        !           100: 
        !           101: - (struct objc_method_description *) descriptionForClassMethod:(SEL)aSel;
        !           102: {
        !           103:   int i;
        !           104:   struct objc_protocol_list* proto_list;
        !           105:   const char* name = sel_get_name (aSel);
        !           106:   struct objc_method_description *result;
        !           107: 
        !           108:   for (i = 0; i < class_methods->count; i++)
        !           109:     {
        !           110:       if (!strcmp ((char*)class_methods->list[i].name, name))
        !           111:        return &(class_methods->list[i]);
        !           112:     }
        !           113: 
        !           114:   for (proto_list = protocol_list; proto_list; proto_list = proto_list->next)
        !           115:     {
        !           116:       for (i=0; i < proto_list->count; i++)
        !           117:        {
        !           118:          if ((result = [proto_list->list[i]
        !           119:                         descriptionForClassMethod: aSel]))
        !           120:            return result;
        !           121:        }
        !           122:     }
        !           123: 
        !           124:   return NULL;
        !           125: }
        !           126: 
        !           127: @end

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