libguile/objprop.c

   1 /*      Copyright (C) 1995,1996, 2000, 2001, 2003, 2006, 2008, 2009 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 static SCM object_whash;
  39
  40 SCM_DEFINE (scm_object_properties, "object-properties", 1, 0, 0,
  41            (SCM obj),
  42             "Return @var{obj}'s property list.")
  43 #define FUNC_NAME s_scm_object_properties
  44 {
  45   return scm_hashq_ref (object_whash, obj, SCM_EOL);
  46 }
  47 #undef FUNC_NAME
  48
  49
  50 SCM_DEFINE (scm_set_object_properties_x, "set-object-properties!", 2, 0, 0,
  51             (SCM obj, SCM alist),
  52             "Set @var{obj}'s property list to @var{alist}.")
  53 #define FUNC_NAME s_scm_set_object_properties_x
  54 {
  55   SCM handle = scm_hashq_create_handle_x (object_whash, obj, alist);
  56   SCM_SETCDR (handle, alist);
  57   return alist;
  58 }
  59 #undef FUNC_NAME
  60
  61 SCM_DEFINE (scm_object_property, "object-property", 2, 0, 0,
  62            (SCM obj, SCM key),
  63             "Return the property of @var{obj} with name @var{key}.")
  64 #define FUNC_NAME s_scm_object_property
  65 {
  66   SCM assoc;
  67   assoc = scm_assq (key, scm_object_properties (obj));
  68   return (SCM_NIMP (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
  69 }
  70 #undef FUNC_NAME
  71
  72 SCM_DEFINE (scm_set_object_property_x, "set-object-property!", 3, 0, 0,
  73             (SCM obj, SCM key, SCM value),
  74             "In @var{obj}'s property list, set the property named @var{key}\n"
  75             "to @var{value}.")
  76 #define FUNC_NAME s_scm_set_object_property_x
  77 {
  78   SCM h;
  79   SCM assoc;
  80   h = scm_hashq_create_handle_x (object_whash, obj, SCM_EOL);
  81   SCM_CRITICAL_SECTION_START;
  82   assoc = scm_assq (key, SCM_CDR (h));
  83   if (SCM_NIMP (assoc))
  84     SCM_SETCDR (assoc, value);
  85   else
  86     {
  87       assoc = scm_acons (key, value, SCM_CDR (h));
  88       SCM_SETCDR (h, assoc);
  89     }
  90   SCM_CRITICAL_SECTION_END;
  91   return value;
  92 }
  93 #undef FUNC_NAME
  94
  95
  96 void
  97 scm_init_objprop ()
  98 {
  99   object_whash = scm_make_weak_key_hash_table (SCM_UNDEFINED);
 100 #include "libguile/objprop.x"
 101 }
 102
 103
 104 /*
 105   Local Variables:
 106   c-file-style: "gnu"
 107   End:
 108 */