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Marius Vollmer 2000-09-03 20:25:19 +00:00
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156
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/* Copyright (C) 1995,1996, 2000 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
#include <stdio.h>
#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}. When no value\n"
"has yet been associated with @var{prop} and @var{obj}, call\n"
"@var{not-found-proc} instead (see @code{primitive-make-property})\n"
"and use its return value. That value is also associated with\n"
"@var{obj} via @code{primitive-property-set!}. When\n"
"@var{not-found-proc} is @code{#f}, use @code{#f} as the\n"
"default value of @var{prop}.")
#define FUNC_NAME s_scm_primitive_property_ref
{
SCM h, assoc;
SCM_VALIDATE_CONS (SCM_ARG1, prop);
h = scm_hashq_get_handle (scm_properties_whash, obj);
assoc = (SCM_NIMP (h) ? scm_assq (prop, SCM_CDR (h)) : SCM_BOOL_F);
if (SCM_NIMP (assoc))
return SCM_CDR (assoc);
if (SCM_FALSEP (SCM_CAR (prop)))
return SCM_BOOL_F;
else
{
SCM val = scm_apply (SCM_CAR (prop),
SCM_LIST2 (prop, obj), SCM_EOL);
if (SCM_IMP (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),
"Associate @var{code} with @var{prop} and @var{obj}.")
#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_NIMP (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_MAKINUM (511));
#include "libguile/properties.x"
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/

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libguile/properties.h Normal file
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/* classes: h_files */
#ifndef PROPERTIES_H
#define PROPERTIES_H
/* Copyright (C) 1995,1996,1998, 2000 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
#include "libguile/__scm.h"
SCM scm_primitive_make_property (SCM not_found_proc);
SCM scm_primitive_property_ref (SCM prop, SCM obj);
SCM scm_primitive_property_set_x (SCM prop, SCM obj, SCM val);
SCM scm_primitive_property_del_x (SCM prop, SCM obj);
void scm_init_properties (void);
#endif /* PROPEERTIES_H */
/*
Local Variables:
c-file-style: "gnu"
End:
*/