libguile/objprop.c

   1 /*      Copyright (C) 1995,1996, 2000, 2001, 2003, 2006, 2008, 2009, 2010, 2011 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
  31 #include "libguile/objprop.h"
  32 \f
  33
  34 /* {Object Properties}
  35  */
  36
  37 static SCM object_whash;
  38
  39 SCM_DEFINE (scm_object_properties, "object-properties", 1, 0, 0,
  40            (SCM obj),
  41             "Return @var{obj}'s property list.")
  42 #define FUNC_NAME s_scm_object_properties
  43 {
  44   return scm_weak_table_refq (object_whash, obj, SCM_EOL);
  45 }
  46 #undef FUNC_NAME
  47
  48
  49 SCM_DEFINE (scm_set_object_properties_x, "set-object-properties!", 2, 0, 0,
  50             (SCM obj, SCM alist),
  51             "Set @var{obj}'s property list to @var{alist}.")
  52 #define FUNC_NAME s_scm_set_object_properties_x
  53 {
  54   scm_weak_table_putq_x (object_whash, obj, alist);
  55
  56   return alist;
  57 }
  58 #undef FUNC_NAME
  59
  60 SCM_DEFINE (scm_object_property, "object-property", 2, 0, 0,
  61            (SCM obj, SCM key),
  62             "Return the property of @var{obj} with name @var{key}.")
  63 #define FUNC_NAME s_scm_object_property
  64 {
  65   SCM assoc;
  66   assoc = scm_assq (key, scm_object_properties (obj));
  67   return (scm_is_pair (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
  68 }
  69 #undef FUNC_NAME
  70
  71 SCM_DEFINE (scm_set_object_property_x, "set-object-property!", 3, 0, 0,
  72             (SCM obj, SCM key, SCM value),
  73             "In @var{obj}'s property list, set the property named @var{key}\n"
  74             "to @var{value}.")
  75 #define FUNC_NAME s_scm_set_object_property_x
  76 {
  77   SCM alist;
  78   SCM assoc;
  79
  80   scm_i_pthread_mutex_lock (&scm_i_misc_mutex);
  81   alist = scm_weak_table_refq (object_whash, obj, SCM_EOL);
  82   assoc = scm_assq (key, alist);
  83   if (scm_is_pair (assoc))
  84     SCM_SETCDR (assoc, value);
  85   else
  86     scm_weak_table_putq_x (object_whash, obj, scm_acons (key, value, alist));
  87   scm_i_pthread_mutex_unlock (&scm_i_misc_mutex);
  88
  89   return value;
  90 }
  91 #undef FUNC_NAME
  92
  93
  94 void
  95 scm_init_objprop ()
  96 {
  97   object_whash = scm_c_make_weak_table (0, SCM_WEAK_TABLE_KIND_KEY);
  98 #include "libguile/objprop.x"
  99 }
 100
 101
 102 /*
 103   Local Variables:
 104   c-file-style: "gnu"
 105   End:
 106 */