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231a4ea8 | 1 | /* Copyright (C) 1995,1996,2000,2001, 2003 Free Software Foundation, Inc. |
718eb176 | 2 | * |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
718eb176 | 7 | * |
73be1d9e MV |
8 | * This library 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 GNU | |
11 | * Lesser General Public License for more details. | |
718eb176 | 12 | * |
73be1d9e MV |
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
16 | */ | |
718eb176 | 17 | |
718eb176 MV |
18 | |
19 | \f | |
20 | ||
718eb176 MV |
21 | #include "libguile/_scm.h" |
22 | #include "libguile/hashtab.h" | |
23 | #include "libguile/alist.h" | |
24 | #include "libguile/root.h" | |
25 | #include "libguile/weaks.h" | |
26 | #include "libguile/validate.h" | |
27 | #include "libguile/eval.h" | |
28 | ||
29 | #include "libguile/properties.h" | |
30 | \f | |
31 | ||
32 | /* {Properties} | |
33 | */ | |
34 | ||
35 | SCM_DEFINE (scm_primitive_make_property, "primitive-make-property", 1, 0, 0, | |
36 | (SCM not_found_proc), | |
37 | "Create a @dfn{property token} that can be used with\n" | |
38 | "@code{primitive-property-ref} and @code{primitive-property-set!}.\n" | |
39 | "See @code{primitive-property-ref} for the significance of\n" | |
40 | "@var{not_found_proc}.") | |
41 | #define FUNC_NAME s_scm_primitive_make_property | |
42 | { | |
43 | if (not_found_proc != SCM_BOOL_F) | |
44 | SCM_VALIDATE_PROC (SCM_ARG1, not_found_proc); | |
45 | return scm_cons (not_found_proc, SCM_EOL); | |
46 | } | |
47 | #undef FUNC_NAME | |
48 | ||
22a52da1 | 49 | |
718eb176 MV |
50 | SCM_DEFINE (scm_primitive_property_ref, "primitive-property-ref", 2, 0, 0, |
51 | (SCM prop, SCM obj), | |
52 | "Return the property @var{prop} of @var{obj}. When no value\n" | |
53 | "has yet been associated with @var{prop} and @var{obj}, call\n" | |
54 | "@var{not-found-proc} instead (see @code{primitive-make-property})\n" | |
55 | "and use its return value. That value is also associated with\n" | |
56 | "@var{obj} via @code{primitive-property-set!}. When\n" | |
57 | "@var{not-found-proc} is @code{#f}, use @code{#f} as the\n" | |
58 | "default value of @var{prop}.") | |
59 | #define FUNC_NAME s_scm_primitive_property_ref | |
60 | { | |
22a52da1 | 61 | SCM h; |
718eb176 MV |
62 | |
63 | SCM_VALIDATE_CONS (SCM_ARG1, prop); | |
64 | ||
65 | h = scm_hashq_get_handle (scm_properties_whash, obj); | |
22a52da1 DH |
66 | if (!SCM_FALSEP (h)) |
67 | { | |
68 | SCM assoc = scm_assq (prop, SCM_CDR (h)); | |
69 | if (!SCM_FALSEP (assoc)) | |
70 | return SCM_CDR (assoc); | |
71 | } | |
718eb176 MV |
72 | |
73 | if (SCM_FALSEP (SCM_CAR (prop))) | |
74 | return SCM_BOOL_F; | |
75 | else | |
76 | { | |
fdc28395 | 77 | SCM val = scm_call_2 (SCM_CAR (prop), prop, obj); |
22a52da1 | 78 | if (SCM_FALSEP (h)) |
718eb176 MV |
79 | h = scm_hashq_create_handle_x (scm_properties_whash, obj, SCM_EOL); |
80 | SCM_SETCDR (h, scm_acons (prop, val, SCM_CDR (h))); | |
81 | return val; | |
82 | } | |
83 | } | |
84 | #undef FUNC_NAME | |
85 | ||
22a52da1 | 86 | |
718eb176 MV |
87 | SCM_DEFINE (scm_primitive_property_set_x, "primitive-property-set!", 3, 0, 0, |
88 | (SCM prop, SCM obj, SCM val), | |
89 | "Associate @var{code} with @var{prop} and @var{obj}.") | |
90 | #define FUNC_NAME s_scm_primitive_property_set_x | |
91 | { | |
92 | SCM h, assoc; | |
93 | SCM_VALIDATE_CONS (SCM_ARG1, prop); | |
94 | h = scm_hashq_create_handle_x (scm_properties_whash, obj, SCM_EOL); | |
95 | assoc = scm_assq (prop, SCM_CDR (h)); | |
96 | if (SCM_NIMP (assoc)) | |
97 | SCM_SETCDR (assoc, val); | |
98 | else | |
99 | { | |
100 | assoc = scm_acons (prop, val, SCM_CDR (h)); | |
101 | SCM_SETCDR (h, assoc); | |
102 | } | |
103 | return SCM_UNSPECIFIED; | |
104 | } | |
105 | #undef FUNC_NAME | |
106 | ||
22a52da1 | 107 | |
718eb176 MV |
108 | SCM_DEFINE (scm_primitive_property_del_x, "primitive-property-del!", 2, 0, 0, |
109 | (SCM prop, SCM obj), | |
110 | "Remove any value associated with @var{prop} and @var{obj}.") | |
111 | #define FUNC_NAME s_scm_primitive_property_del_x | |
112 | { | |
113 | SCM h; | |
114 | SCM_VALIDATE_CONS (SCM_ARG1, prop); | |
115 | h = scm_hashq_get_handle (scm_properties_whash, obj); | |
22a52da1 | 116 | if (!SCM_FALSEP (h)) |
718eb176 MV |
117 | SCM_SETCDR (h, scm_assq_remove_x (SCM_CDR (h), prop)); |
118 | return SCM_UNSPECIFIED; | |
119 | } | |
120 | #undef FUNC_NAME | |
121 | ||
22a52da1 | 122 | |
718eb176 MV |
123 | void |
124 | scm_init_properties () | |
125 | { | |
231a4ea8 | 126 | scm_properties_whash = scm_make_weak_key_hash_table (SCM_UNDEFINED); |
718eb176 MV |
127 | #include "libguile/properties.x" |
128 | } | |
129 | ||
130 | ||
131 | /* | |
132 | Local Variables: | |
133 | c-file-style: "gnu" | |
134 | End: | |
135 | */ |