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718eb176 MV |
1 | /* Copyright (C) 1995,1996, 2000 Free Software Foundation, Inc. |
2 | * | |
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) | |
6 | * any later version. | |
7 | * | |
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. | |
12 | * | |
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 | |
17 | * | |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
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. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
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. | |
37 | * | |
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. */ | |
41 | ||
42 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
43 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
44 | ||
45 | \f | |
46 | ||
718eb176 MV |
47 | #include "libguile/_scm.h" |
48 | #include "libguile/hashtab.h" | |
49 | #include "libguile/alist.h" | |
50 | #include "libguile/root.h" | |
51 | #include "libguile/weaks.h" | |
52 | #include "libguile/validate.h" | |
53 | #include "libguile/eval.h" | |
54 | ||
55 | #include "libguile/properties.h" | |
56 | \f | |
57 | ||
58 | /* {Properties} | |
59 | */ | |
60 | ||
61 | SCM_DEFINE (scm_primitive_make_property, "primitive-make-property", 1, 0, 0, | |
62 | (SCM not_found_proc), | |
63 | "Create a @dfn{property token} that can be used with\n" | |
64 | "@code{primitive-property-ref} and @code{primitive-property-set!}.\n" | |
65 | "See @code{primitive-property-ref} for the significance of\n" | |
66 | "@var{not_found_proc}.") | |
67 | #define FUNC_NAME s_scm_primitive_make_property | |
68 | { | |
69 | if (not_found_proc != SCM_BOOL_F) | |
70 | SCM_VALIDATE_PROC (SCM_ARG1, not_found_proc); | |
71 | return scm_cons (not_found_proc, SCM_EOL); | |
72 | } | |
73 | #undef FUNC_NAME | |
74 | ||
75 | SCM_DEFINE (scm_primitive_property_ref, "primitive-property-ref", 2, 0, 0, | |
76 | (SCM prop, SCM obj), | |
77 | "Return the property @var{prop} of @var{obj}. When no value\n" | |
78 | "has yet been associated with @var{prop} and @var{obj}, call\n" | |
79 | "@var{not-found-proc} instead (see @code{primitive-make-property})\n" | |
80 | "and use its return value. That value is also associated with\n" | |
81 | "@var{obj} via @code{primitive-property-set!}. When\n" | |
82 | "@var{not-found-proc} is @code{#f}, use @code{#f} as the\n" | |
83 | "default value of @var{prop}.") | |
84 | #define FUNC_NAME s_scm_primitive_property_ref | |
85 | { | |
86 | SCM h, assoc; | |
87 | ||
88 | SCM_VALIDATE_CONS (SCM_ARG1, prop); | |
89 | ||
90 | h = scm_hashq_get_handle (scm_properties_whash, obj); | |
91 | assoc = (SCM_NIMP (h) ? scm_assq (prop, SCM_CDR (h)) : SCM_BOOL_F); | |
92 | if (SCM_NIMP (assoc)) | |
93 | return SCM_CDR (assoc); | |
94 | ||
95 | if (SCM_FALSEP (SCM_CAR (prop))) | |
96 | return SCM_BOOL_F; | |
97 | else | |
98 | { | |
99 | SCM val = scm_apply (SCM_CAR (prop), | |
100 | SCM_LIST2 (prop, obj), SCM_EOL); | |
101 | if (SCM_IMP (h)) | |
102 | h = scm_hashq_create_handle_x (scm_properties_whash, obj, SCM_EOL); | |
103 | SCM_SETCDR (h, scm_acons (prop, val, SCM_CDR (h))); | |
104 | return val; | |
105 | } | |
106 | } | |
107 | #undef FUNC_NAME | |
108 | ||
109 | SCM_DEFINE (scm_primitive_property_set_x, "primitive-property-set!", 3, 0, 0, | |
110 | (SCM prop, SCM obj, SCM val), | |
111 | "Associate @var{code} with @var{prop} and @var{obj}.") | |
112 | #define FUNC_NAME s_scm_primitive_property_set_x | |
113 | { | |
114 | SCM h, assoc; | |
115 | SCM_VALIDATE_CONS (SCM_ARG1, prop); | |
116 | h = scm_hashq_create_handle_x (scm_properties_whash, obj, SCM_EOL); | |
117 | assoc = scm_assq (prop, SCM_CDR (h)); | |
118 | if (SCM_NIMP (assoc)) | |
119 | SCM_SETCDR (assoc, val); | |
120 | else | |
121 | { | |
122 | assoc = scm_acons (prop, val, SCM_CDR (h)); | |
123 | SCM_SETCDR (h, assoc); | |
124 | } | |
125 | return SCM_UNSPECIFIED; | |
126 | } | |
127 | #undef FUNC_NAME | |
128 | ||
129 | SCM_DEFINE (scm_primitive_property_del_x, "primitive-property-del!", 2, 0, 0, | |
130 | (SCM prop, SCM obj), | |
131 | "Remove any value associated with @var{prop} and @var{obj}.") | |
132 | #define FUNC_NAME s_scm_primitive_property_del_x | |
133 | { | |
134 | SCM h; | |
135 | SCM_VALIDATE_CONS (SCM_ARG1, prop); | |
136 | h = scm_hashq_get_handle (scm_properties_whash, obj); | |
137 | if (SCM_NIMP (h)) | |
138 | SCM_SETCDR (h, scm_assq_remove_x (SCM_CDR (h), prop)); | |
139 | return SCM_UNSPECIFIED; | |
140 | } | |
141 | #undef FUNC_NAME | |
142 | ||
143 | void | |
144 | scm_init_properties () | |
145 | { | |
146 | scm_properties_whash = scm_make_weak_key_hash_table (SCM_MAKINUM (511)); | |
8dc9439f | 147 | #ifndef SCM_MAGIC_SNARFER |
718eb176 | 148 | #include "libguile/properties.x" |
8dc9439f | 149 | #endif |
718eb176 MV |
150 | } |
151 | ||
152 | ||
153 | /* | |
154 | Local Variables: | |
155 | c-file-style: "gnu" | |
156 | End: | |
157 | */ |