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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 | |
82892bed JB |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
16 | * Boston, MA 02111-1307 USA | |
0f2d19dd JB |
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. | |
82892bed | 40 | * If you do not wish that, delete this exception notice. */ |
0f2d19dd JB |
41 | \f |
42 | ||
43 | #include <stdio.h> | |
44 | #include "_scm.h" | |
a7254b72 | 45 | #include "eq.h" |
20e6290e JB |
46 | #include "genio.h" |
47 | #include "smob.h" | |
0f2d19dd | 48 | |
20e6290e | 49 | #include "variable.h" |
0f2d19dd | 50 | \f |
1cc91f1b JB |
51 | |
52 | static scm_sizet free_var SCM_P ((SCM obj)); | |
53 | ||
0f2d19dd JB |
54 | static scm_sizet |
55 | free_var (obj) | |
56 | SCM obj; | |
0f2d19dd JB |
57 | { |
58 | return 0; | |
59 | } | |
60 | ||
61 | ||
1cc91f1b JB |
62 | |
63 | static int prin_var SCM_P ((SCM exp, SCM port, scm_print_state *pstate)); | |
64 | ||
0f2d19dd | 65 | static int |
9882ea19 | 66 | prin_var (exp, port, pstate) |
0f2d19dd JB |
67 | SCM exp; |
68 | SCM port; | |
9882ea19 | 69 | scm_print_state *pstate; |
0f2d19dd JB |
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); | |
9882ea19 | 79 | scm_iprin1 (SCM_CAR (val_cell), port, pstate); |
0f2d19dd JB |
80 | } |
81 | scm_gen_puts (scm_regular_string, " binding: ", port); | |
9882ea19 | 82 | scm_iprin1 (SCM_CDR (val_cell), port, pstate); |
0f2d19dd JB |
83 | } |
84 | scm_gen_putc('>', port); | |
85 | return 1; | |
86 | } | |
87 | ||
1cc91f1b JB |
88 | |
89 | static SCM scm_markvar SCM_P ((SCM ptr)); | |
90 | ||
0f2d19dd JB |
91 | static SCM |
92 | scm_markvar (ptr) | |
93 | SCM ptr; | |
0f2d19dd JB |
94 | { |
95 | if (SCM_GC8MARKP (ptr)) | |
96 | return SCM_BOOL_F; | |
97 | SCM_SETGC8MARK (ptr); | |
98 | return SCM_CDR (ptr); | |
99 | } | |
100 | ||
a7254b72 JB |
101 | static SCM var_equal SCM_P ((SCM var1, SCM var2)); |
102 | ||
103 | static SCM | |
104 | var_equal (var1, var2) | |
105 | SCM var1; | |
106 | SCM var2; | |
107 | { | |
108 | return scm_equal_p (SCM_CDR (var1), SCM_CDR (var2)); | |
109 | } | |
110 | ||
0f2d19dd | 111 | int scm_tc16_variable; |
a7254b72 | 112 | static scm_smobfuns variable_smob = {scm_markvar, free_var, prin_var, var_equal}; |
0f2d19dd JB |
113 | \f |
114 | ||
0179ae48 | 115 | static SCM anonymous_variable_sym; |
0f2d19dd | 116 | |
1cc91f1b JB |
117 | |
118 | static SCM make_vcell_variable SCM_P ((SCM vcell)); | |
119 | ||
0f2d19dd JB |
120 | static SCM |
121 | make_vcell_variable (vcell) | |
122 | SCM vcell; | |
0f2d19dd JB |
123 | { |
124 | SCM answer; | |
125 | SCM_NEWCELL(answer); | |
126 | SCM_REDEFER_INTS; | |
a6c64c3c MD |
127 | SCM_SETCAR (answer, scm_tc16_variable); |
128 | SCM_SETCDR (answer, vcell); | |
0f2d19dd JB |
129 | SCM_REALLOW_INTS; |
130 | return answer; | |
131 | } | |
132 | ||
0179ae48 | 133 | SCM_PROC(s_make_variable, "make-variable", 1, 1, 0, scm_make_variable); |
1cc91f1b | 134 | |
0f2d19dd JB |
135 | SCM |
136 | scm_make_variable (init, name_hint) | |
137 | SCM init; | |
138 | SCM name_hint; | |
0f2d19dd JB |
139 | { |
140 | SCM val_cell; | |
0179ae48 JB |
141 | |
142 | if (name_hint == SCM_UNDEFINED) | |
143 | name_hint = anonymous_variable_sym; | |
144 | ||
0f2d19dd JB |
145 | SCM_NEWCELL(val_cell); |
146 | SCM_DEFER_INTS; | |
a6c64c3c MD |
147 | SCM_SETCAR (val_cell, name_hint); |
148 | SCM_SETCDR (val_cell, init); | |
0f2d19dd JB |
149 | SCM_ALLOW_INTS; |
150 | return make_vcell_variable (val_cell); | |
151 | } | |
152 | ||
153 | ||
154 | SCM_PROC(s_make_undefined_variable, "make-undefined-variable", 0, 1, 0, scm_make_undefined_variable); | |
1cc91f1b | 155 | |
0f2d19dd JB |
156 | SCM |
157 | scm_make_undefined_variable (name_hint) | |
158 | SCM name_hint; | |
0f2d19dd JB |
159 | { |
160 | SCM vcell; | |
161 | ||
162 | if (name_hint == SCM_UNDEFINED) | |
0179ae48 | 163 | name_hint = anonymous_variable_sym; |
0f2d19dd JB |
164 | |
165 | SCM_NEWCELL (vcell); | |
166 | SCM_DEFER_INTS; | |
a6c64c3c MD |
167 | SCM_SETCAR (vcell, name_hint); |
168 | SCM_SETCDR (vcell, SCM_UNDEFINED); | |
0f2d19dd JB |
169 | SCM_ALLOW_INTS; |
170 | return make_vcell_variable (vcell); | |
171 | } | |
172 | ||
173 | ||
174 | SCM_PROC(s_variable_p, "variable?", 1, 0, 0, scm_variable_p); | |
1cc91f1b | 175 | |
0f2d19dd JB |
176 | SCM |
177 | scm_variable_p (obj) | |
178 | SCM obj; | |
0f2d19dd JB |
179 | { |
180 | return ( (SCM_NIMP(obj) && SCM_VARIABLEP (obj)) | |
181 | ? SCM_BOOL_T | |
182 | : SCM_BOOL_F); | |
183 | } | |
184 | ||
185 | ||
186 | SCM_PROC(s_variable_ref, "variable-ref", 1, 0, 0, scm_variable_ref); | |
1cc91f1b | 187 | |
0f2d19dd JB |
188 | SCM |
189 | scm_variable_ref (var) | |
190 | SCM var; | |
0f2d19dd JB |
191 | { |
192 | SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP(var), var, SCM_ARG1, s_variable_ref); | |
193 | return SCM_CDR (SCM_CDR (var)); | |
194 | } | |
195 | ||
196 | ||
197 | ||
198 | SCM_PROC(s_variable_set_x, "variable-set!", 2, 0, 0, scm_variable_set_x); | |
1cc91f1b | 199 | |
0f2d19dd JB |
200 | SCM |
201 | scm_variable_set_x (var, val) | |
202 | SCM var; | |
203 | SCM val; | |
0f2d19dd JB |
204 | { |
205 | SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP (var), var, SCM_ARG1, s_variable_set_x); | |
a6c64c3c | 206 | SCM_SETCDR (SCM_CDR (var), val); |
0f2d19dd JB |
207 | return SCM_UNSPECIFIED; |
208 | } | |
209 | ||
210 | ||
211 | SCM_PROC(s_builtin_variable, "builtin-variable", 1, 0, 0, scm_builtin_variable); | |
1cc91f1b | 212 | |
0f2d19dd JB |
213 | SCM |
214 | scm_builtin_variable (name) | |
215 | SCM name; | |
0f2d19dd JB |
216 | { |
217 | SCM vcell; | |
218 | SCM var_slot; | |
219 | ||
220 | SCM_ASSERT (SCM_NIMP (name) && SCM_SYMBOLP (name), name, SCM_ARG1, s_builtin_variable); | |
221 | vcell = scm_sym2vcell (name, SCM_BOOL_F, SCM_BOOL_T); | |
222 | if (vcell == SCM_BOOL_F) | |
223 | return SCM_BOOL_F; | |
224 | ||
225 | scm_intern_symbol (scm_symhash_vars, name); | |
226 | var_slot = scm_sym2ovcell (name, scm_symhash_vars); | |
227 | ||
228 | SCM_DEFER_INTS; | |
229 | if ( SCM_IMP (SCM_CDR (var_slot)) | |
230 | || (SCM_VARVCELL (var_slot) != vcell)) | |
a6c64c3c | 231 | SCM_SETCDR (var_slot, make_vcell_variable (vcell)); |
0f2d19dd JB |
232 | SCM_ALLOW_INTS; |
233 | ||
234 | return SCM_CDR (var_slot); | |
235 | } | |
236 | ||
237 | ||
238 | SCM_PROC(s_variable_bound_p, "variable-bound?", 1, 0, 0, scm_variable_bound_p); | |
1cc91f1b | 239 | |
0f2d19dd JB |
240 | SCM |
241 | scm_variable_bound_p (var) | |
242 | SCM var; | |
0f2d19dd JB |
243 | { |
244 | SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP (var), var, SCM_ARG1, s_variable_bound_p); | |
245 | return (SCM_UNBNDP (SCM_CDR (SCM_VARVCELL (var))) | |
246 | ? SCM_BOOL_F | |
247 | : SCM_BOOL_T); | |
248 | } | |
249 | ||
250 | ||
251 | ||
1cc91f1b | 252 | |
0f2d19dd JB |
253 | void |
254 | scm_init_variable () | |
0f2d19dd JB |
255 | { |
256 | scm_tc16_variable = scm_newsmob (&variable_smob); | |
0179ae48 | 257 | anonymous_variable_sym = SCM_CAR (scm_sysintern ("anonymous-variable", SCM_UNDEFINED)); |
0f2d19dd JB |
258 | #include "variable.x" |
259 | } | |
260 |