libguile/objprop.c

   1 /*      Copyright (C) 1995,1996, 2000, 2001, 2003 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, Inc., 59 Temple Place, Suite 330,
  16  * Boston, MA 02111-1307 USA
  17  *
  18  * As a special exception, the Free Software Foundation gives permission
  19  * for additional uses of the text contained in its release of GUILE.
  20  *
  21  * The exception is that, if you link the GUILE library with other files
  22  * to produce an executable, this does not by itself cause the
  23  * resulting executable to be covered by the GNU General Public License.
  24  * Your use of that executable is in no way restricted on account of
  25  * linking the GUILE library code into it.
  26  *
  27  * This exception does not however invalidate any other reasons why
  28  * the executable file might be covered by the GNU General Public License.
  29  *
  30  * This exception applies only to the code released by the
  31  * Free Software Foundation under the name GUILE.  If you copy
  32  * code from other Free Software Foundation releases into a copy of
  33  * GUILE, as the General Public License permits, the exception does
  34  * not apply to the code that you add in this way.  To avoid misleading
  35  * anyone as to the status of such modified files, you must delete
  36  * this exception notice from them.
  37  *
  38  * If you write modifications of your own for GUILE, it is your choice
  39  * whether to permit this exception to apply to your modifications.
  40  * If you do not wish that, delete this exception notice.  */
  41
  42
  43 \f
  44
  45 #include "libguile/_scm.h"
  46 #include "libguile/hashtab.h"
  47 #include "libguile/alist.h"
  48 #include "libguile/root.h"
  49 #include "libguile/weaks.h"
  50
  51 #include "libguile/objprop.h"
  52 \f
  53
  54 /* {Object Properties}
  55  */
  56
  57 SCM_DEFINE (scm_object_properties, "object-properties", 1, 0, 0,
  58            (SCM obj),
  59             "Return @var{obj}'s property list.")
  60 #define FUNC_NAME s_scm_object_properties
  61 {
  62   return scm_hashq_ref (scm_object_whash, obj, SCM_EOL);
  63 }
  64 #undef FUNC_NAME
  65
  66
  67 SCM_DEFINE (scm_set_object_properties_x, "set-object-properties!", 2, 0, 0,
  68             (SCM obj, SCM alist),
  69             "Set @var{obj}'s property list to @var{alist}.")
  70 #define FUNC_NAME s_scm_set_object_properties_x
  71 {
  72   SCM handle = scm_hashq_create_handle_x (scm_object_whash, obj, alist);
  73   SCM_SETCDR (handle, alist);
  74   return alist;
  75 }
  76 #undef FUNC_NAME
  77
  78 SCM_DEFINE (scm_object_property, "object-property", 2, 0, 0,
  79            (SCM obj, SCM key),
  80             "Return the property of @var{obj} with name @var{key}.")
  81 #define FUNC_NAME s_scm_object_property
  82 {
  83   SCM assoc;
  84   assoc = scm_assq (key, scm_object_properties (obj));
  85   return (SCM_NIMP (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
  86 }
  87 #undef FUNC_NAME
  88
  89 SCM_DEFINE (scm_set_object_property_x, "set-object-property!", 3, 0, 0,
  90             (SCM obj, SCM key, SCM value),
  91             "In @var{obj}'s property list, set the property named @var{key}\n"
  92             "to @var{value}.")
  93 #define FUNC_NAME s_scm_set_object_property_x
  94 {
  95   SCM h;
  96   SCM assoc;
  97   h = scm_hashq_create_handle_x (scm_object_whash, obj, SCM_EOL);
  98   SCM_DEFER_INTS;
  99   assoc = scm_assq (key, SCM_CDR (h));
 100   if (SCM_NIMP (assoc))
 101     SCM_SETCDR (assoc, value);
 102   else
 103     {
 104       assoc = scm_acons (key, value, SCM_CDR (h));
 105       SCM_SETCDR (h, assoc);
 106     }
 107   SCM_ALLOW_INTS;
 108   return value;
 109 }
 110 #undef FUNC_NAME
 111
 112
 113 void
 114 scm_init_objprop ()
 115 {
 116   scm_object_whash = scm_make_weak_key_hash_table (SCM_UNDEFINED);
 117 #include "libguile/objprop.x"
 118 }
 119
 120
 121 /*
 122   Local Variables:
 123   c-file-style: "gnu"
 124   End:
 125 */