libguile/objprop.c

   1 /*      Copyright (C) 1995,1996, 2000, 2001, 2003 Free Software Foundation, Inc.
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library 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 GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  16  */
  17
  18
  19 \f
  20
  21 #include "libguile/_scm.h"
  22 #include "libguile/hashtab.h"
  23 #include "libguile/alist.h"
  24 #include "libguile/root.h"
  25 #include "libguile/weaks.h"
  26
  27 #include "libguile/objprop.h"
  28 \f
  29
  30 /* {Object Properties}
  31  */
  32
  33 SCM_DEFINE (scm_object_properties, "object-properties", 1, 0, 0,
  34            (SCM obj),
  35             "Return @var{obj}'s property list.")
  36 #define FUNC_NAME s_scm_object_properties
  37 {
  38   return scm_hashq_ref (scm_object_whash, obj, SCM_EOL);
  39 }
  40 #undef FUNC_NAME
  41
  42
  43 SCM_DEFINE (scm_set_object_properties_x, "set-object-properties!", 2, 0, 0,
  44             (SCM obj, SCM alist),
  45             "Set @var{obj}'s property list to @var{alist}.")
  46 #define FUNC_NAME s_scm_set_object_properties_x
  47 {
  48   SCM handle = scm_hashq_create_handle_x (scm_object_whash, obj, alist);
  49   SCM_SETCDR (handle, alist);
  50   return alist;
  51 }
  52 #undef FUNC_NAME
  53
  54 SCM_DEFINE (scm_object_property, "object-property", 2, 0, 0,
  55            (SCM obj, SCM key),
  56             "Return the property of @var{obj} with name @var{key}.")
  57 #define FUNC_NAME s_scm_object_property
  58 {
  59   SCM assoc;
  60   assoc = scm_assq (key, scm_object_properties (obj));
  61   return (SCM_NIMP (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
  62 }
  63 #undef FUNC_NAME
  64
  65 SCM_DEFINE (scm_set_object_property_x, "set-object-property!", 3, 0, 0,
  66             (SCM obj, SCM key, SCM value),
  67             "In @var{obj}'s property list, set the property named @var{key}\n"
  68             "to @var{value}.")
  69 #define FUNC_NAME s_scm_set_object_property_x
  70 {
  71   SCM h;
  72   SCM assoc;
  73   h = scm_hashq_create_handle_x (scm_object_whash, obj, SCM_EOL);
  74   SCM_DEFER_INTS;
  75   assoc = scm_assq (key, SCM_CDR (h));
  76   if (SCM_NIMP (assoc))
  77     SCM_SETCDR (assoc, value);
  78   else
  79     {
  80       assoc = scm_acons (key, value, SCM_CDR (h));
  81       SCM_SETCDR (h, assoc);
  82     }
  83   SCM_ALLOW_INTS;
  84   return value;
  85 }
  86 #undef FUNC_NAME
  87
  88
  89 void
  90 scm_init_objprop ()
  91 {
  92   scm_object_whash = scm_make_weak_key_hash_table (SCM_UNDEFINED);
  93 #include "libguile/objprop.x"
  94 }
  95
  96
  97 /*
  98   Local Variables:
  99   c-file-style: "gnu"
 100   End:
 101 */