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 License
   5  * as published by the Free Software Foundation; either version 3 of
   6  * the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful, but
   9  * 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
  16  * 02110-1301 USA
  17  */
  18
  19
  20 \f
  21 #ifdef HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include "libguile/_scm.h"
  26 #include "libguile/async.h"
  27 #include "libguile/hashtab.h"
  28 #include "libguile/alist.h"
  29 #include "libguile/root.h"
  30 #include "libguile/weaks.h"
  31
  32 #include "libguile/objprop.h"
  33 \f
  34
  35 /* {Object Properties}
  36  */
  37
  38 SCM_DEFINE (scm_object_properties, "object-properties", 1, 0, 0,
  39            (SCM obj),
  40             "Return @var{obj}'s property list.")
  41 #define FUNC_NAME s_scm_object_properties
  42 {
  43   return scm_hashq_ref (scm_object_whash, obj, SCM_EOL);
  44 }
  45 #undef FUNC_NAME
  46
  47
  48 SCM_DEFINE (scm_set_object_properties_x, "set-object-properties!", 2, 0, 0,
  49             (SCM obj, SCM alist),
  50             "Set @var{obj}'s property list to @var{alist}.")
  51 #define FUNC_NAME s_scm_set_object_properties_x
  52 {
  53   SCM handle = scm_hashq_create_handle_x (scm_object_whash, obj, alist);
  54   SCM_SETCDR (handle, alist);
  55   return alist;
  56 }
  57 #undef FUNC_NAME
  58
  59 SCM_DEFINE (scm_object_property, "object-property", 2, 0, 0,
  60            (SCM obj, SCM key),
  61             "Return the property of @var{obj} with name @var{key}.")
  62 #define FUNC_NAME s_scm_object_property
  63 {
  64   SCM assoc;
  65   assoc = scm_assq (key, scm_object_properties (obj));
  66   return (SCM_NIMP (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
  67 }
  68 #undef FUNC_NAME
  69
  70 SCM_DEFINE (scm_set_object_property_x, "set-object-property!", 3, 0, 0,
  71             (SCM obj, SCM key, SCM value),
  72             "In @var{obj}'s property list, set the property named @var{key}\n"
  73             "to @var{value}.")
  74 #define FUNC_NAME s_scm_set_object_property_x
  75 {
  76   SCM h;
  77   SCM assoc;
  78   h = scm_hashq_create_handle_x (scm_object_whash, obj, SCM_EOL);
  79   SCM_CRITICAL_SECTION_START;
  80   assoc = scm_assq (key, SCM_CDR (h));
  81   if (SCM_NIMP (assoc))
  82     SCM_SETCDR (assoc, value);
  83   else
  84     {
  85       assoc = scm_acons (key, value, SCM_CDR (h));
  86       SCM_SETCDR (h, assoc);
  87     }
  88   SCM_CRITICAL_SECTION_END;
  89   return value;
  90 }
  91 #undef FUNC_NAME
  92
  93
  94 void
  95 scm_init_objprop ()
  96 {
  97   scm_object_whash = scm_make_weak_key_hash_table (SCM_UNDEFINED);
  98 #include "libguile/objprop.x"
  99 }
 100
 101
 102 /*
 103   Local Variables:
 104   c-file-style: "gnu"
 105   End:
 106 */