libguile/objprop.c

   1 /*      Copyright (C) 1995,1996, 2000, 2001, 2003, 2006, 2008 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  16  */
  17
  18
  19 \f
  20 #ifdef HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include "libguile/_scm.h"
  25 #include "libguile/async.h"
  26 #include "libguile/hashtab.h"
  27 #include "libguile/alist.h"
  28 #include "libguile/root.h"
  29 #include "libguile/weaks.h"
  30
  31 #include "libguile/objprop.h"
  32 \f
  33
  34 /* {Object Properties}
  35  */
  36
  37 SCM_DEFINE (scm_object_properties, "object-properties", 1, 0, 0,
  38            (SCM obj),
  39             "Return @var{obj}'s property list.")
  40 #define FUNC_NAME s_scm_object_properties
  41 {
  42   return scm_hashq_ref (scm_object_whash, obj, SCM_EOL);
  43 }
  44 #undef FUNC_NAME
  45
  46
  47 SCM_DEFINE (scm_set_object_properties_x, "set-object-properties!", 2, 0, 0,
  48             (SCM obj, SCM alist),
  49             "Set @var{obj}'s property list to @var{alist}.")
  50 #define FUNC_NAME s_scm_set_object_properties_x
  51 {
  52   SCM handle = scm_hashq_create_handle_x (scm_object_whash, obj, alist);
  53   SCM_SETCDR (handle, alist);
  54   return alist;
  55 }
  56 #undef FUNC_NAME
  57
  58 SCM_DEFINE (scm_object_property, "object-property", 2, 0, 0,
  59            (SCM obj, SCM key),
  60             "Return the property of @var{obj} with name @var{key}.")
  61 #define FUNC_NAME s_scm_object_property
  62 {
  63   SCM assoc;
  64   assoc = scm_assq (key, scm_object_properties (obj));
  65   return (SCM_NIMP (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
  66 }
  67 #undef FUNC_NAME
  68
  69 SCM_DEFINE (scm_set_object_property_x, "set-object-property!", 3, 0, 0,
  70             (SCM obj, SCM key, SCM value),
  71             "In @var{obj}'s property list, set the property named @var{key}\n"
  72             "to @var{value}.")
  73 #define FUNC_NAME s_scm_set_object_property_x
  74 {
  75   SCM h;
  76   SCM assoc;
  77   h = scm_hashq_create_handle_x (scm_object_whash, obj, SCM_EOL);
  78   SCM_CRITICAL_SECTION_START;
  79   assoc = scm_assq (key, SCM_CDR (h));
  80   if (SCM_NIMP (assoc))
  81     SCM_SETCDR (assoc, value);
  82   else
  83     {
  84       assoc = scm_acons (key, value, SCM_CDR (h));
  85       SCM_SETCDR (h, assoc);
  86     }
  87   SCM_CRITICAL_SECTION_END;
  88   return value;
  89 }
  90 #undef FUNC_NAME
  91
  92
  93 void
  94 scm_init_objprop ()
  95 {
  96   scm_object_whash = scm_make_weak_key_hash_table (SCM_UNDEFINED);
  97 #include "libguile/objprop.x"
  98 }
  99
 100
 101 /*
 102   Local Variables:
 103   c-file-style: "gnu"
 104   End:
 105 */