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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" | |
20e6290e JB |
45 | #include "genio.h" |
46 | #include "smob.h" | |
0f2d19dd | 47 | |
20e6290e | 48 | #include "variable.h" |
0f2d19dd JB |
49 | \f |
50 | #ifdef __STDC__ | |
51 | static scm_sizet | |
52 | free_var (SCM obj) | |
53 | #else | |
54 | static scm_sizet | |
55 | free_var (obj) | |
56 | SCM obj; | |
57 | #endif | |
58 | { | |
59 | return 0; | |
60 | } | |
61 | ||
62 | ||
63 | #ifdef __STDC__ | |
64 | static int | |
9882ea19 | 65 | prin_var (SCM exp, SCM port, scm_print_state *pstate) |
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66 | #else |
67 | static int | |
9882ea19 | 68 | prin_var (exp, port, pstate) |
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69 | SCM exp; |
70 | SCM port; | |
9882ea19 | 71 | scm_print_state *pstate; |
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72 | #endif |
73 | { | |
74 | scm_gen_puts (scm_regular_string, "#<variable ", port); | |
75 | scm_intprint(exp, 16, port); | |
76 | { | |
77 | SCM val_cell; | |
78 | val_cell = SCM_CDR(exp); | |
79 | if (SCM_CAR (val_cell) != SCM_UNDEFINED) | |
80 | { | |
81 | scm_gen_puts (scm_regular_string, " name: ", port); | |
9882ea19 | 82 | scm_iprin1 (SCM_CAR (val_cell), port, pstate); |
0f2d19dd JB |
83 | } |
84 | scm_gen_puts (scm_regular_string, " binding: ", port); | |
9882ea19 | 85 | scm_iprin1 (SCM_CDR (val_cell), port, pstate); |
0f2d19dd JB |
86 | } |
87 | scm_gen_putc('>', port); | |
88 | return 1; | |
89 | } | |
90 | ||
91 | #ifdef __STDC__ | |
92 | static SCM | |
93 | scm_markvar (SCM ptr) | |
94 | #else | |
95 | static SCM | |
96 | scm_markvar (ptr) | |
97 | SCM ptr; | |
98 | #endif | |
99 | { | |
100 | if (SCM_GC8MARKP (ptr)) | |
101 | return SCM_BOOL_F; | |
102 | SCM_SETGC8MARK (ptr); | |
103 | return SCM_CDR (ptr); | |
104 | } | |
105 | ||
106 | int scm_tc16_variable; | |
107 | static scm_smobfuns variable_smob = {scm_markvar, free_var, prin_var, 0}; | |
108 | \f | |
109 | ||
110 | static SCM variable_sym; | |
111 | ||
112 | #ifdef __STDC__ | |
113 | static SCM | |
114 | make_vcell_variable (SCM vcell) | |
115 | #else | |
116 | static SCM | |
117 | make_vcell_variable (vcell) | |
118 | SCM vcell; | |
119 | #endif | |
120 | { | |
121 | SCM answer; | |
122 | SCM_NEWCELL(answer); | |
123 | SCM_REDEFER_INTS; | |
124 | SCM_CAR(answer) = scm_tc16_variable; | |
125 | SCM_CDR(answer) = vcell; | |
126 | SCM_REALLOW_INTS; | |
127 | return answer; | |
128 | } | |
129 | ||
130 | SCM_PROC(s_make_variable, "make-variable", 2, 0, 0, scm_make_variable); | |
131 | #ifdef __STDC__ | |
132 | SCM | |
133 | scm_make_variable (SCM init, SCM name_hint) | |
134 | #else | |
135 | SCM | |
136 | scm_make_variable (init, name_hint) | |
137 | SCM init; | |
138 | SCM name_hint; | |
139 | #endif | |
140 | { | |
141 | SCM val_cell; | |
142 | SCM_NEWCELL(val_cell); | |
143 | SCM_DEFER_INTS; | |
144 | SCM_CAR(val_cell) = name_hint; | |
145 | SCM_CDR(val_cell) = init; | |
146 | SCM_ALLOW_INTS; | |
147 | return make_vcell_variable (val_cell); | |
148 | } | |
149 | ||
150 | ||
151 | SCM_PROC(s_make_undefined_variable, "make-undefined-variable", 0, 1, 0, scm_make_undefined_variable); | |
152 | #ifdef __STDC__ | |
153 | SCM | |
154 | scm_make_undefined_variable (SCM name_hint) | |
155 | #else | |
156 | SCM | |
157 | scm_make_undefined_variable (name_hint) | |
158 | SCM name_hint; | |
159 | #endif | |
160 | { | |
161 | SCM vcell; | |
162 | ||
163 | if (name_hint == SCM_UNDEFINED) | |
164 | name_hint = variable_sym; | |
165 | ||
166 | SCM_NEWCELL (vcell); | |
167 | SCM_DEFER_INTS; | |
168 | SCM_CAR (vcell) = name_hint; | |
169 | SCM_CDR (vcell) = SCM_UNDEFINED; | |
170 | SCM_ALLOW_INTS; | |
171 | return make_vcell_variable (vcell); | |
172 | } | |
173 | ||
174 | ||
175 | SCM_PROC(s_variable_p, "variable?", 1, 0, 0, scm_variable_p); | |
176 | #ifdef __STDC__ | |
177 | SCM | |
178 | scm_variable_p (SCM obj) | |
179 | #else | |
180 | SCM | |
181 | scm_variable_p (obj) | |
182 | SCM obj; | |
183 | #endif | |
184 | { | |
185 | return ( (SCM_NIMP(obj) && SCM_VARIABLEP (obj)) | |
186 | ? SCM_BOOL_T | |
187 | : SCM_BOOL_F); | |
188 | } | |
189 | ||
190 | ||
191 | SCM_PROC(s_variable_ref, "variable-ref", 1, 0, 0, scm_variable_ref); | |
192 | #ifdef __STDC__ | |
193 | SCM | |
194 | scm_variable_ref (SCM var) | |
195 | #else | |
196 | SCM | |
197 | scm_variable_ref (var) | |
198 | SCM var; | |
199 | #endif | |
200 | { | |
201 | SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP(var), var, SCM_ARG1, s_variable_ref); | |
202 | return SCM_CDR (SCM_CDR (var)); | |
203 | } | |
204 | ||
205 | ||
206 | ||
207 | SCM_PROC(s_variable_set_x, "variable-set!", 2, 0, 0, scm_variable_set_x); | |
208 | #ifdef __STDC__ | |
209 | SCM | |
210 | scm_variable_set_x (SCM var, SCM val) | |
211 | #else | |
212 | SCM | |
213 | scm_variable_set_x (var, val) | |
214 | SCM var; | |
215 | SCM val; | |
216 | #endif | |
217 | { | |
218 | SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP (var), var, SCM_ARG1, s_variable_set_x); | |
219 | SCM_CDR (SCM_CDR (var)) = val; | |
220 | return SCM_UNSPECIFIED; | |
221 | } | |
222 | ||
223 | ||
224 | SCM_PROC(s_builtin_variable, "builtin-variable", 1, 0, 0, scm_builtin_variable); | |
225 | #ifdef __STDC__ | |
226 | SCM | |
227 | scm_builtin_variable (SCM name) | |
228 | #else | |
229 | SCM | |
230 | scm_builtin_variable (name) | |
231 | SCM name; | |
232 | #endif | |
233 | { | |
234 | SCM vcell; | |
235 | SCM var_slot; | |
236 | ||
237 | SCM_ASSERT (SCM_NIMP (name) && SCM_SYMBOLP (name), name, SCM_ARG1, s_builtin_variable); | |
238 | vcell = scm_sym2vcell (name, SCM_BOOL_F, SCM_BOOL_T); | |
239 | if (vcell == SCM_BOOL_F) | |
240 | return SCM_BOOL_F; | |
241 | ||
242 | scm_intern_symbol (scm_symhash_vars, name); | |
243 | var_slot = scm_sym2ovcell (name, scm_symhash_vars); | |
244 | ||
245 | SCM_DEFER_INTS; | |
246 | if ( SCM_IMP (SCM_CDR (var_slot)) | |
247 | || (SCM_VARVCELL (var_slot) != vcell)) | |
248 | SCM_CDR (var_slot) = make_vcell_variable (vcell); | |
249 | SCM_ALLOW_INTS; | |
250 | ||
251 | return SCM_CDR (var_slot); | |
252 | } | |
253 | ||
254 | ||
255 | SCM_PROC(s_variable_bound_p, "variable-bound?", 1, 0, 0, scm_variable_bound_p); | |
256 | #ifdef __STDC__ | |
257 | SCM | |
258 | scm_variable_bound_p (SCM var) | |
259 | #else | |
260 | SCM | |
261 | scm_variable_bound_p (var) | |
262 | SCM var; | |
263 | #endif | |
264 | { | |
265 | SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP (var), var, SCM_ARG1, s_variable_bound_p); | |
266 | return (SCM_UNBNDP (SCM_CDR (SCM_VARVCELL (var))) | |
267 | ? SCM_BOOL_F | |
268 | : SCM_BOOL_T); | |
269 | } | |
270 | ||
271 | ||
272 | ||
273 | #ifdef __STDC__ | |
274 | void | |
275 | scm_init_variable (void) | |
276 | #else | |
277 | void | |
278 | scm_init_variable () | |
279 | #endif | |
280 | { | |
281 | scm_tc16_variable = scm_newsmob (&variable_smob); | |
282 | variable_sym = SCM_CAR (scm_sysintern ("anonymous-variable", SCM_UNDEFINED)); | |
283 | #include "variable.x" | |
284 | } | |
285 |