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/* Copyright (C) 1995,1996,2000,2001, 2003 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libguile/_scm.h"
#include "libguile/hashtab.h"
#include "libguile/alist.h"
#include "libguile/root.h"
#include "libguile/weaks.h"
#include "libguile/validate.h"
#include "libguile/eval.h"
#include "libguile/properties.h"
/* {Properties}
*/
SCM_DEFINE (scm_primitive_make_property, "primitive-make-property", 1, 0, 0,
(SCM not_found_proc),
"Create a @dfn{property token} that can be used with\n"
"@code{primitive-property-ref} and @code{primitive-property-set!}.\n"
"See @code{primitive-property-ref} for the significance of\n"
"@var{not_found_proc}.")
#define FUNC_NAME s_scm_primitive_make_property
{
if (not_found_proc != SCM_BOOL_F)
SCM_VALIDATE_PROC (SCM_ARG1, not_found_proc);
return scm_cons (not_found_proc, SCM_EOL);
}
#undef FUNC_NAME
SCM_DEFINE (scm_primitive_property_ref, "primitive-property-ref", 2, 0, 0,
(SCM prop, SCM obj),
"Return the property @var{prop} of @var{obj}.\n"
"\n"
"When no value has yet been associated with @var{prop} and\n"
"@var{obj}, the @var{not-found-proc} from @var{prop} is used. A\n"
"call @code{(@var{not-found-proc} @var{prop} @var{obj})} is made\n"
"and the result set as the property value. If\n"
"@var{not-found-proc} is @code{#f} then @code{#f} is the\n"
"property value.")
#define FUNC_NAME s_scm_primitive_property_ref
{
SCM h;
SCM_VALIDATE_CONS (SCM_ARG1, prop);
h = scm_hashq_get_handle (scm_properties_whash, obj);
if (scm_is_true (h))
{
SCM assoc = scm_assq (prop, SCM_CDR (h));
if (scm_is_true (assoc))
return SCM_CDR (assoc);
}
if (scm_is_false (SCM_CAR (prop)))
return SCM_BOOL_F;
else
{
SCM val = scm_call_2 (SCM_CAR (prop), prop, obj);
if (scm_is_false (h))
h = scm_hashq_create_handle_x (scm_properties_whash, obj, SCM_EOL);
SCM_SETCDR (h, scm_acons (prop, val, SCM_CDR (h)));
return val;
}
}
#undef FUNC_NAME
SCM_DEFINE (scm_primitive_property_set_x, "primitive-property-set!", 3, 0, 0,
(SCM prop, SCM obj, SCM val),
"Set the property @var{prop} of @var{obj} to @var{val}.")
#define FUNC_NAME s_scm_primitive_property_set_x
{
SCM h, assoc;
SCM_VALIDATE_CONS (SCM_ARG1, prop);
h = scm_hashq_create_handle_x (scm_properties_whash, obj, SCM_EOL);
assoc = scm_assq (prop, SCM_CDR (h));
if (SCM_NIMP (assoc))
SCM_SETCDR (assoc, val);
else
{
assoc = scm_acons (prop, val, SCM_CDR (h));
SCM_SETCDR (h, assoc);
}
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM_DEFINE (scm_primitive_property_del_x, "primitive-property-del!", 2, 0, 0,
(SCM prop, SCM obj),
"Remove any value associated with @var{prop} and @var{obj}.")
#define FUNC_NAME s_scm_primitive_property_del_x
{
SCM h;
SCM_VALIDATE_CONS (SCM_ARG1, prop);
h = scm_hashq_get_handle (scm_properties_whash, obj);
if (scm_is_true (h))
SCM_SETCDR (h, scm_assq_remove_x (SCM_CDR (h), prop));
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
void
scm_init_properties ()
{
scm_properties_whash = scm_make_weak_key_hash_table (SCM_UNDEFINED);
#include "libguile/properties.x"
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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