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0f2d19dd JB |
1 | /* Copyright (C) 1995,1996 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, 675 Mass Ave, Cambridge, MA 02139, USA. | |
16 | * | |
17 | * As a special exception, the Free Software Foundation gives permission | |
18 | * for additional uses of the text contained in its release of GUILE. | |
19 | * | |
20 | * The exception is that, if you link the GUILE library with other files | |
21 | * to produce an executable, this does not by itself cause the | |
22 | * resulting executable to be covered by the GNU General Public License. | |
23 | * Your use of that executable is in no way restricted on account of | |
24 | * linking the GUILE library code into it. | |
25 | * | |
26 | * This exception does not however invalidate any other reasons why | |
27 | * the executable file might be covered by the GNU General Public License. | |
28 | * | |
29 | * This exception applies only to the code released by the | |
30 | * Free Software Foundation under the name GUILE. If you copy | |
31 | * code from other Free Software Foundation releases into a copy of | |
32 | * GUILE, as the General Public License permits, the exception does | |
33 | * not apply to the code that you add in this way. To avoid misleading | |
34 | * anyone as to the status of such modified files, you must delete | |
35 | * this exception notice from them. | |
36 | * | |
37 | * If you write modifications of your own for GUILE, it is your choice | |
38 | * whether to permit this exception to apply to your modifications. | |
39 | * If you do not wish that, delete this exception notice. | |
40 | */ | |
41 | \f | |
42 | ||
43 | #include <stdio.h> | |
44 | #include "_scm.h" | |
45 | ||
46 | \f | |
47 | #ifdef __STDC__ | |
48 | static scm_sizet | |
49 | free_var (SCM obj) | |
50 | #else | |
51 | static scm_sizet | |
52 | free_var (obj) | |
53 | SCM obj; | |
54 | #endif | |
55 | { | |
56 | return 0; | |
57 | } | |
58 | ||
59 | ||
60 | #ifdef __STDC__ | |
61 | static int | |
62 | prin_var (SCM exp, SCM port, int writing) | |
63 | #else | |
64 | static int | |
65 | prin_var (exp, port, writing) | |
66 | SCM exp; | |
67 | SCM port; | |
68 | int writing; | |
69 | #endif | |
70 | { | |
71 | scm_gen_puts (scm_regular_string, "#<variable ", port); | |
72 | scm_intprint(exp, 16, port); | |
73 | { | |
74 | SCM val_cell; | |
75 | val_cell = SCM_CDR(exp); | |
76 | if (SCM_CAR (val_cell) != SCM_UNDEFINED) | |
77 | { | |
78 | scm_gen_puts (scm_regular_string, " name: ", port); | |
79 | scm_iprin1 (SCM_CAR (val_cell), port, writing); | |
80 | } | |
81 | scm_gen_puts (scm_regular_string, " binding: ", port); | |
82 | scm_iprin1 (SCM_CDR (val_cell), port, writing); | |
83 | } | |
84 | scm_gen_putc('>', port); | |
85 | return 1; | |
86 | } | |
87 | ||
88 | #ifdef __STDC__ | |
89 | static SCM | |
90 | scm_markvar (SCM ptr) | |
91 | #else | |
92 | static SCM | |
93 | scm_markvar (ptr) | |
94 | SCM ptr; | |
95 | #endif | |
96 | { | |
97 | if (SCM_GC8MARKP (ptr)) | |
98 | return SCM_BOOL_F; | |
99 | SCM_SETGC8MARK (ptr); | |
100 | return SCM_CDR (ptr); | |
101 | } | |
102 | ||
103 | int scm_tc16_variable; | |
104 | static scm_smobfuns variable_smob = {scm_markvar, free_var, prin_var, 0}; | |
105 | \f | |
106 | ||
107 | static SCM variable_sym; | |
108 | ||
109 | #ifdef __STDC__ | |
110 | static SCM | |
111 | make_vcell_variable (SCM vcell) | |
112 | #else | |
113 | static SCM | |
114 | make_vcell_variable (vcell) | |
115 | SCM vcell; | |
116 | #endif | |
117 | { | |
118 | SCM answer; | |
119 | SCM_NEWCELL(answer); | |
120 | SCM_REDEFER_INTS; | |
121 | SCM_CAR(answer) = scm_tc16_variable; | |
122 | SCM_CDR(answer) = vcell; | |
123 | SCM_REALLOW_INTS; | |
124 | return answer; | |
125 | } | |
126 | ||
127 | SCM_PROC(s_make_variable, "make-variable", 2, 0, 0, scm_make_variable); | |
128 | #ifdef __STDC__ | |
129 | SCM | |
130 | scm_make_variable (SCM init, SCM name_hint) | |
131 | #else | |
132 | SCM | |
133 | scm_make_variable (init, name_hint) | |
134 | SCM init; | |
135 | SCM name_hint; | |
136 | #endif | |
137 | { | |
138 | SCM val_cell; | |
139 | SCM_NEWCELL(val_cell); | |
140 | SCM_DEFER_INTS; | |
141 | SCM_CAR(val_cell) = name_hint; | |
142 | SCM_CDR(val_cell) = init; | |
143 | SCM_ALLOW_INTS; | |
144 | return make_vcell_variable (val_cell); | |
145 | } | |
146 | ||
147 | ||
148 | SCM_PROC(s_make_undefined_variable, "make-undefined-variable", 0, 1, 0, scm_make_undefined_variable); | |
149 | #ifdef __STDC__ | |
150 | SCM | |
151 | scm_make_undefined_variable (SCM name_hint) | |
152 | #else | |
153 | SCM | |
154 | scm_make_undefined_variable (name_hint) | |
155 | SCM name_hint; | |
156 | #endif | |
157 | { | |
158 | SCM vcell; | |
159 | ||
160 | if (name_hint == SCM_UNDEFINED) | |
161 | name_hint = variable_sym; | |
162 | ||
163 | SCM_NEWCELL (vcell); | |
164 | SCM_DEFER_INTS; | |
165 | SCM_CAR (vcell) = name_hint; | |
166 | SCM_CDR (vcell) = SCM_UNDEFINED; | |
167 | SCM_ALLOW_INTS; | |
168 | return make_vcell_variable (vcell); | |
169 | } | |
170 | ||
171 | ||
172 | SCM_PROC(s_variable_p, "variable?", 1, 0, 0, scm_variable_p); | |
173 | #ifdef __STDC__ | |
174 | SCM | |
175 | scm_variable_p (SCM obj) | |
176 | #else | |
177 | SCM | |
178 | scm_variable_p (obj) | |
179 | SCM obj; | |
180 | #endif | |
181 | { | |
182 | return ( (SCM_NIMP(obj) && SCM_VARIABLEP (obj)) | |
183 | ? SCM_BOOL_T | |
184 | : SCM_BOOL_F); | |
185 | } | |
186 | ||
187 | ||
188 | SCM_PROC(s_variable_ref, "variable-ref", 1, 0, 0, scm_variable_ref); | |
189 | #ifdef __STDC__ | |
190 | SCM | |
191 | scm_variable_ref (SCM var) | |
192 | #else | |
193 | SCM | |
194 | scm_variable_ref (var) | |
195 | SCM var; | |
196 | #endif | |
197 | { | |
198 | SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP(var), var, SCM_ARG1, s_variable_ref); | |
199 | return SCM_CDR (SCM_CDR (var)); | |
200 | } | |
201 | ||
202 | ||
203 | ||
204 | SCM_PROC(s_variable_set_x, "variable-set!", 2, 0, 0, scm_variable_set_x); | |
205 | #ifdef __STDC__ | |
206 | SCM | |
207 | scm_variable_set_x (SCM var, SCM val) | |
208 | #else | |
209 | SCM | |
210 | scm_variable_set_x (var, val) | |
211 | SCM var; | |
212 | SCM val; | |
213 | #endif | |
214 | { | |
215 | SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP (var), var, SCM_ARG1, s_variable_set_x); | |
216 | SCM_CDR (SCM_CDR (var)) = val; | |
217 | return SCM_UNSPECIFIED; | |
218 | } | |
219 | ||
220 | ||
221 | SCM_PROC(s_builtin_variable, "builtin-variable", 1, 0, 0, scm_builtin_variable); | |
222 | #ifdef __STDC__ | |
223 | SCM | |
224 | scm_builtin_variable (SCM name) | |
225 | #else | |
226 | SCM | |
227 | scm_builtin_variable (name) | |
228 | SCM name; | |
229 | #endif | |
230 | { | |
231 | SCM vcell; | |
232 | SCM var_slot; | |
233 | ||
234 | SCM_ASSERT (SCM_NIMP (name) && SCM_SYMBOLP (name), name, SCM_ARG1, s_builtin_variable); | |
235 | vcell = scm_sym2vcell (name, SCM_BOOL_F, SCM_BOOL_T); | |
236 | if (vcell == SCM_BOOL_F) | |
237 | return SCM_BOOL_F; | |
238 | ||
239 | scm_intern_symbol (scm_symhash_vars, name); | |
240 | var_slot = scm_sym2ovcell (name, scm_symhash_vars); | |
241 | ||
242 | SCM_DEFER_INTS; | |
243 | if ( SCM_IMP (SCM_CDR (var_slot)) | |
244 | || (SCM_VARVCELL (var_slot) != vcell)) | |
245 | SCM_CDR (var_slot) = make_vcell_variable (vcell); | |
246 | SCM_ALLOW_INTS; | |
247 | ||
248 | return SCM_CDR (var_slot); | |
249 | } | |
250 | ||
251 | ||
252 | SCM_PROC(s_variable_bound_p, "variable-bound?", 1, 0, 0, scm_variable_bound_p); | |
253 | #ifdef __STDC__ | |
254 | SCM | |
255 | scm_variable_bound_p (SCM var) | |
256 | #else | |
257 | SCM | |
258 | scm_variable_bound_p (var) | |
259 | SCM var; | |
260 | #endif | |
261 | { | |
262 | SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP (var), var, SCM_ARG1, s_variable_bound_p); | |
263 | return (SCM_UNBNDP (SCM_CDR (SCM_VARVCELL (var))) | |
264 | ? SCM_BOOL_F | |
265 | : SCM_BOOL_T); | |
266 | } | |
267 | ||
268 | ||
269 | ||
270 | #ifdef __STDC__ | |
271 | void | |
272 | scm_init_variable (void) | |
273 | #else | |
274 | void | |
275 | scm_init_variable () | |
276 | #endif | |
277 | { | |
278 | scm_tc16_variable = scm_newsmob (&variable_smob); | |
279 | variable_sym = SCM_CAR (scm_sysintern ("anonymous-variable", SCM_UNDEFINED)); | |
280 | #include "variable.x" | |
281 | } | |
282 |