libguile/objprop.c

   1 /*      Copyright (C) 1995,1996 Free Software Foundation, Inc.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this software; see the file COPYING.  If not, write to
  15  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  16  *
  17  * As a special exception, the Free Software Foundation gives permission
  18  * for additional uses of the text contained in its release of GUILE.
  19  *
  20  * The exception is that, if you link the GUILE library with other files
  21  * to produce an executable, this does not by itself cause the
  22  * resulting executable to be covered by the GNU General Public License.
  23  * Your use of that executable is in no way restricted on account of
  24  * linking the GUILE library code into it.
  25  *
  26  * This exception does not however invalidate any other reasons why
  27  * the executable file might be covered by the GNU General Public License.
  28  *
  29  * This exception applies only to the code released by the
  30  * Free Software Foundation under the name GUILE.  If you copy
  31  * code from other Free Software Foundation releases into a copy of
  32  * GUILE, as the General Public License permits, the exception does
  33  * not apply to the code that you add in this way.  To avoid misleading
  34  * anyone as to the status of such modified files, you must delete
  35  * this exception notice from them.
  36  *
  37  * If you write modifications of your own for GUILE, it is your choice
  38  * whether to permit this exception to apply to your modifications.
  39  * If you do not wish that, delete this exception notice.
  40  */
  41 \f
  42
  43 #include <stdio.h>
  44 #include "_scm.h"
  45
  46 \f
  47
  48 /* {Object Properties}
  49  */
  50
  51 SCM_PROC(s_object_properties, "object-properties", 1, 0, 0, scm_object_properties);
  52 #ifdef __STDC__
  53 SCM
  54 scm_object_properties (SCM obj)
  55 #else
  56 SCM
  57 scm_object_properties (obj)
  58      SCM obj;
  59 #endif
  60 {
  61   return scm_hashq_ref (scm_object_whash, obj, SCM_EOL);
  62 }
  63
  64
  65 SCM_PROC(s_set_object_properties_x, "set-object-properties!", 2, 0, 0, scm_set_object_properties_x);
  66 #ifdef __STDC__
  67 SCM
  68 scm_set_object_properties_x (SCM obj, SCM plist)
  69 #else
  70 SCM
  71 scm_set_object_properties_x (obj, plist)
  72      SCM obj;
  73      SCM plist;
  74 #endif
  75 {
  76   SCM handle = scm_hashq_create_handle_x (scm_object_whash, obj, plist);
  77   SCM_SETCDR (handle, plist);
  78   return plist;
  79 }
  80
  81 SCM_PROC(s_object_property, "object-property", 2, 0, 0, scm_object_property);
  82 #ifdef __STDC__
  83 SCM
  84 scm_object_property (SCM obj, SCM key)
  85 #else
  86 SCM
  87 scm_object_property (obj, key)
  88      SCM obj;
  89      SCM key;
  90 #endif
  91 {
  92   SCM assoc;
  93   assoc = scm_assq (key, SCM_CDR (scm_object_properties (obj)));
  94   return (SCM_NIMP (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
  95 }
  96
  97 SCM_PROC(s_set_object_property_x, "set-object-property!", 3, 0, 0, scm_set_object_property_x);
  98 #ifdef __STDC__
  99 SCM
 100 scm_set_object_property_x (SCM obj, SCM key, SCM val)
 101 #else
 102 SCM
 103 scm_set_object_property_x (obj, key, val)
 104      SCM obj;
 105      SCM key;
 106      SCM val;
 107 #endif
 108 {
 109   SCM h;
 110   SCM assoc;
 111   h = scm_hashq_create_handle_x (scm_object_whash, obj, SCM_EOL);
 112   SCM_DEFER_INTS;
 113   assoc = scm_assoc (key, SCM_CDR (h));
 114   if (SCM_NIMP (assoc))
 115     SCM_SETCDR (assoc, val);
 116   else
 117     {
 118       assoc = scm_acons (key, val, SCM_CDR (h));
 119       SCM_SETCDR (h, assoc);
 120     }
 121   SCM_ALLOW_INTS;
 122   return val;
 123 }
 124
 125 #ifdef __STDC__
 126 void
 127 scm_init_objprop (void)
 128 #else
 129 void
 130 scm_init_objprop ()
 131 #endif
 132 {
 133   scm_object_whash = scm_make_weak_key_hash_table (SCM_MAKINUM (511));
 134 #include "objprop.x"
 135 }
 136