1 /* Copyright (C) 1995,1996, 2000 Free Software Foundation, Inc.
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2, or (at your option)
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this software; see the file COPYING. If not, write to
15 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
16 * Boston, MA 02111-1307 USA
18 * As a special exception, the Free Software Foundation gives permission
19 * for additional uses of the text contained in its release of GUILE.
21 * The exception is that, if you link the GUILE library with other files
22 * to produce an executable, this does not by itself cause the
23 * resulting executable to be covered by the GNU General Public License.
24 * Your use of that executable is in no way restricted on account of
25 * linking the GUILE library code into it.
27 * This exception does not however invalidate any other reasons why
28 * the executable file might be covered by the GNU General Public License.
30 * This exception applies only to the code released by the
31 * Free Software Foundation under the name GUILE. If you copy
32 * code from other Free Software Foundation releases into a copy of
33 * GUILE, as the General Public License permits, the exception does
34 * not apply to the code that you add in this way. To avoid misleading
35 * anyone as to the status of such modified files, you must delete
36 * this exception notice from them.
38 * If you write modifications of your own for GUILE, it is your choice
39 * whether to permit this exception to apply to your modifications.
40 * If you do not wish that, delete this exception notice. */
42 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
43 gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
48 #include "libguile/_scm.h"
49 #include "libguile/hashtab.h"
50 #include "libguile/alist.h"
51 #include "libguile/root.h"
52 #include "libguile/weaks.h"
53 #include "libguile/validate.h"
54 #include "libguile/eval.h"
56 #include "libguile/properties.h"
62 SCM_DEFINE (scm_primitive_make_property
, "primitive-make-property", 1, 0, 0,
64 "Create a @dfn{property token} that can be used with\n"
65 "@code{primitive-property-ref} and @code{primitive-property-set!}.\n"
66 "See @code{primitive-property-ref} for the significance of\n"
67 "@var{not_found_proc}.")
68 #define FUNC_NAME s_scm_primitive_make_property
70 if (not_found_proc
!= SCM_BOOL_F
)
71 SCM_VALIDATE_PROC (SCM_ARG1
, not_found_proc
);
72 return scm_cons (not_found_proc
, SCM_EOL
);
76 SCM_DEFINE (scm_primitive_property_ref
, "primitive-property-ref", 2, 0, 0,
78 "Return the property @var{prop} of @var{obj}. When no value\n"
79 "has yet been associated with @var{prop} and @var{obj}, call\n"
80 "@var{not-found-proc} instead (see @code{primitive-make-property})\n"
81 "and use its return value. That value is also associated with\n"
82 "@var{obj} via @code{primitive-property-set!}. When\n"
83 "@var{not-found-proc} is @code{#f}, use @code{#f} as the\n"
84 "default value of @var{prop}.")
85 #define FUNC_NAME s_scm_primitive_property_ref
89 SCM_VALIDATE_CONS (SCM_ARG1
, prop
);
91 h
= scm_hashq_get_handle (scm_properties_whash
, obj
);
92 assoc
= (SCM_NIMP (h
) ? scm_assq (prop
, SCM_CDR (h
)) : SCM_BOOL_F
);
94 return SCM_CDR (assoc
);
96 if (SCM_FALSEP (SCM_CAR (prop
)))
100 SCM val
= scm_apply (SCM_CAR (prop
),
101 SCM_LIST2 (prop
, obj
), SCM_EOL
);
103 h
= scm_hashq_create_handle_x (scm_properties_whash
, obj
, SCM_EOL
);
104 SCM_SETCDR (h
, scm_acons (prop
, val
, SCM_CDR (h
)));
110 SCM_DEFINE (scm_primitive_property_set_x
, "primitive-property-set!", 3, 0, 0,
111 (SCM prop
, SCM obj
, SCM val
),
112 "Associate @var{code} with @var{prop} and @var{obj}.")
113 #define FUNC_NAME s_scm_primitive_property_set_x
116 SCM_VALIDATE_CONS (SCM_ARG1
, prop
);
117 h
= scm_hashq_create_handle_x (scm_properties_whash
, obj
, SCM_EOL
);
118 assoc
= scm_assq (prop
, SCM_CDR (h
));
119 if (SCM_NIMP (assoc
))
120 SCM_SETCDR (assoc
, val
);
123 assoc
= scm_acons (prop
, val
, SCM_CDR (h
));
124 SCM_SETCDR (h
, assoc
);
126 return SCM_UNSPECIFIED
;
130 SCM_DEFINE (scm_primitive_property_del_x
, "primitive-property-del!", 2, 0, 0,
132 "Remove any value associated with @var{prop} and @var{obj}.")
133 #define FUNC_NAME s_scm_primitive_property_del_x
136 SCM_VALIDATE_CONS (SCM_ARG1
, prop
);
137 h
= scm_hashq_get_handle (scm_properties_whash
, obj
);
139 SCM_SETCDR (h
, scm_assq_remove_x (SCM_CDR (h
), prop
));
140 return SCM_UNSPECIFIED
;
145 scm_init_properties ()
147 scm_properties_whash
= scm_make_weak_key_hash_table (SCM_MAKINUM (511));
148 #ifndef SCM_MAGIC_SNARFER
149 #include "libguile/properties.x"