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4fd1f652 | 1 | /* Copyright (C) 1995, 1996, 1997, 1998, 2000 Free Software Foundation, Inc. |
0f2d19dd JB |
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. */ |
1bbd0b84 GB |
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 | ||
0f2d19dd JB |
45 | \f |
46 | ||
47 | #include <stdio.h> | |
a0599745 MD |
48 | #include "libguile/_scm.h" |
49 | #include "libguile/eq.h" | |
50 | #include "libguile/ports.h" | |
51 | #include "libguile/root.h" | |
52 | #include "libguile/smob.h" | |
53 | ||
54 | #include "libguile/validate.h" | |
55 | #include "libguile/variable.h" | |
0f2d19dd | 56 | \f |
e841c3e0 | 57 | scm_bits_t scm_tc16_variable; |
1cc91f1b | 58 | |
0f2d19dd | 59 | static int |
e841c3e0 | 60 | variable_print (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 61 | { |
b7f3516f | 62 | scm_puts ("#<variable ", port); |
4260a7fc | 63 | scm_intprint(SCM_UNPACK (exp), 16, port); |
0f2d19dd JB |
64 | { |
65 | SCM val_cell; | |
66 | val_cell = SCM_CDR(exp); | |
4260a7fc | 67 | if (!SCM_UNBNDP (SCM_CAR (val_cell))) |
0f2d19dd | 68 | { |
b7f3516f | 69 | scm_puts (" name: ", port); |
9882ea19 | 70 | scm_iprin1 (SCM_CAR (val_cell), port, pstate); |
0f2d19dd | 71 | } |
b7f3516f | 72 | scm_puts (" binding: ", port); |
9882ea19 | 73 | scm_iprin1 (SCM_CDR (val_cell), port, pstate); |
0f2d19dd | 74 | } |
b7f3516f | 75 | scm_putc('>', port); |
0f2d19dd JB |
76 | return 1; |
77 | } | |
78 | ||
a7254b72 | 79 | static SCM |
e841c3e0 | 80 | variable_equalp (SCM var1, SCM var2) |
a7254b72 JB |
81 | { |
82 | return scm_equal_p (SCM_CDR (var1), SCM_CDR (var2)); | |
83 | } | |
0f2d19dd JB |
84 | \f |
85 | ||
0179ae48 | 86 | static SCM anonymous_variable_sym; |
0f2d19dd | 87 | |
1cc91f1b | 88 | |
0f2d19dd | 89 | static SCM |
1bbd0b84 | 90 | make_vcell_variable (SCM vcell) |
0f2d19dd | 91 | { |
4260a7fc | 92 | SCM_RETURN_NEWSMOB (scm_tc16_variable, SCM_UNPACK (vcell)); |
0f2d19dd JB |
93 | } |
94 | ||
3b3b36dd | 95 | SCM_DEFINE (scm_make_variable, "make-variable", 1, 1, 0, |
d727c64b GB |
96 | (SCM init, SCM name_hint), |
97 | "Return a variable object initialized to value INIT.\n" | |
98 | "If given, uses NAME-HINT as its internal (debugging)\n" | |
99 | "name, otherwise just treat it as an anonymous variable.\n" | |
100 | "Remember, of course, that multiple bindings to the same\n" | |
b450f070 | 101 | "variable may exist, so NAME-HINT is just that---a hint.\n") |
1bbd0b84 | 102 | #define FUNC_NAME s_scm_make_variable |
0f2d19dd JB |
103 | { |
104 | SCM val_cell; | |
0179ae48 | 105 | |
4260a7fc | 106 | if (SCM_UNBNDP (name_hint)) |
0179ae48 JB |
107 | name_hint = anonymous_variable_sym; |
108 | ||
0f2d19dd JB |
109 | SCM_NEWCELL(val_cell); |
110 | SCM_DEFER_INTS; | |
a6c64c3c MD |
111 | SCM_SETCAR (val_cell, name_hint); |
112 | SCM_SETCDR (val_cell, init); | |
0f2d19dd JB |
113 | SCM_ALLOW_INTS; |
114 | return make_vcell_variable (val_cell); | |
115 | } | |
1bbd0b84 | 116 | #undef FUNC_NAME |
0f2d19dd JB |
117 | |
118 | ||
3b3b36dd | 119 | SCM_DEFINE (scm_make_undefined_variable, "make-undefined-variable", 0, 1, 0, |
d727c64b GB |
120 | (SCM name_hint), |
121 | "Return a variable object initialized to an undefined value.\n" | |
122 | "If given, uses NAME-HINT as its internal (debugging)\n" | |
123 | "name, otherwise just treat it as an anonymous variable.\n" | |
124 | "Remember, of course, that multiple bindings to the same\n" | |
b450f070 | 125 | "variable may exist, so NAME-HINT is just that---a hint.\n") |
1bbd0b84 | 126 | #define FUNC_NAME s_scm_make_undefined_variable |
0f2d19dd JB |
127 | { |
128 | SCM vcell; | |
129 | ||
4260a7fc | 130 | if (SCM_UNBNDP (name_hint)) |
0179ae48 | 131 | name_hint = anonymous_variable_sym; |
0f2d19dd JB |
132 | |
133 | SCM_NEWCELL (vcell); | |
134 | SCM_DEFER_INTS; | |
a6c64c3c MD |
135 | SCM_SETCAR (vcell, name_hint); |
136 | SCM_SETCDR (vcell, SCM_UNDEFINED); | |
0f2d19dd JB |
137 | SCM_ALLOW_INTS; |
138 | return make_vcell_variable (vcell); | |
139 | } | |
1bbd0b84 | 140 | #undef FUNC_NAME |
0f2d19dd JB |
141 | |
142 | ||
3b3b36dd | 143 | SCM_DEFINE (scm_variable_p, "variable?", 1, 0, 0, |
d727c64b GB |
144 | (SCM obj), |
145 | "Return #t iff OBJ is a variable object, else return #f\n") | |
1bbd0b84 | 146 | #define FUNC_NAME s_scm_variable_p |
0f2d19dd | 147 | { |
4fd1f652 | 148 | return SCM_BOOL (SCM_VARIABLEP (obj)); |
0f2d19dd | 149 | } |
1bbd0b84 | 150 | #undef FUNC_NAME |
0f2d19dd JB |
151 | |
152 | ||
3b3b36dd | 153 | SCM_DEFINE (scm_variable_ref, "variable-ref", 1, 0, 0, |
d727c64b GB |
154 | (SCM var), |
155 | "Dereference VAR and return its value.\n" | |
156 | "VAR must be a variable object; see `make-variable' and\n" | |
157 | "`make-undefined-variable'") | |
1bbd0b84 | 158 | #define FUNC_NAME s_scm_variable_ref |
0f2d19dd | 159 | { |
4fd1f652 | 160 | SCM_VALIDATE_VARIABLE (1, var); |
0f2d19dd JB |
161 | return SCM_CDR (SCM_CDR (var)); |
162 | } | |
1bbd0b84 | 163 | #undef FUNC_NAME |
0f2d19dd JB |
164 | |
165 | ||
166 | ||
3b3b36dd | 167 | SCM_DEFINE (scm_variable_set_x, "variable-set!", 2, 0, 0, |
d727c64b GB |
168 | (SCM var, SCM val), |
169 | "Set the value of the variable VAR to VAL.\n" | |
170 | "VAR must be a variable object, VAL can be any value.\n" | |
b450f070 | 171 | "Returns an unspecified value.\n") |
1bbd0b84 | 172 | #define FUNC_NAME s_scm_variable_set_x |
0f2d19dd | 173 | { |
3b3b36dd | 174 | SCM_VALIDATE_VARIABLE (1,var); |
a6c64c3c | 175 | SCM_SETCDR (SCM_CDR (var), val); |
0f2d19dd JB |
176 | return SCM_UNSPECIFIED; |
177 | } | |
1bbd0b84 | 178 | #undef FUNC_NAME |
0f2d19dd JB |
179 | |
180 | ||
3b3b36dd | 181 | SCM_DEFINE (scm_builtin_variable, "builtin-variable", 1, 0, 0, |
d727c64b GB |
182 | (SCM name), |
183 | "Return the built-in variable with the name NAME.\n" | |
184 | "NAME must be a symbol (not a string).\n" | |
b450f070 | 185 | "Then use `variable-ref' to access its value.\n") |
1bbd0b84 | 186 | #define FUNC_NAME s_scm_builtin_variable |
0f2d19dd JB |
187 | { |
188 | SCM vcell; | |
189 | SCM var_slot; | |
190 | ||
3b3b36dd | 191 | SCM_VALIDATE_SYMBOL (1,name); |
0f2d19dd | 192 | vcell = scm_sym2vcell (name, SCM_BOOL_F, SCM_BOOL_T); |
4260a7fc | 193 | if (SCM_FALSEP (vcell)) |
0f2d19dd JB |
194 | return SCM_BOOL_F; |
195 | ||
196 | scm_intern_symbol (scm_symhash_vars, name); | |
197 | var_slot = scm_sym2ovcell (name, scm_symhash_vars); | |
198 | ||
199 | SCM_DEFER_INTS; | |
4260a7fc DH |
200 | if (SCM_IMP (SCM_CDR (var_slot)) |
201 | || !SCM_EQ_P (SCM_VARVCELL (var_slot), vcell)) | |
a6c64c3c | 202 | SCM_SETCDR (var_slot, make_vcell_variable (vcell)); |
0f2d19dd JB |
203 | SCM_ALLOW_INTS; |
204 | ||
205 | return SCM_CDR (var_slot); | |
206 | } | |
1bbd0b84 | 207 | #undef FUNC_NAME |
0f2d19dd JB |
208 | |
209 | ||
3b3b36dd | 210 | SCM_DEFINE (scm_variable_bound_p, "variable-bound?", 1, 0, 0, |
d727c64b GB |
211 | (SCM var), |
212 | "Return #t iff VAR is bound to a value.\n" | |
b450f070 | 213 | "Throws an error if VAR is not a variable object.\n") |
1bbd0b84 | 214 | #define FUNC_NAME s_scm_variable_bound_p |
0f2d19dd | 215 | { |
3b3b36dd | 216 | SCM_VALIDATE_VARIABLE (1,var); |
1bbd0b84 | 217 | return SCM_NEGATE_BOOL(SCM_UNBNDP (SCM_CDR (SCM_VARVCELL (var)))); |
0f2d19dd | 218 | } |
1bbd0b84 | 219 | #undef FUNC_NAME |
0f2d19dd JB |
220 | |
221 | ||
222 | ||
1cc91f1b | 223 | |
0f2d19dd JB |
224 | void |
225 | scm_init_variable () | |
0f2d19dd | 226 | { |
e841c3e0 KN |
227 | scm_tc16_variable = scm_make_smob_type ("variable", 0); |
228 | scm_set_smob_mark (scm_tc16_variable, scm_markcdr); | |
229 | scm_set_smob_print (scm_tc16_variable, variable_print); | |
230 | scm_set_smob_equalp (scm_tc16_variable, variable_equalp); | |
231 | ||
0179ae48 | 232 | anonymous_variable_sym = SCM_CAR (scm_sysintern ("anonymous-variable", SCM_UNDEFINED)); |
8dc9439f | 233 | #ifndef SCM_MAGIC_SNARFER |
a0599745 | 234 | #include "libguile/variable.x" |
8dc9439f | 235 | #endif |
0f2d19dd JB |
236 | } |
237 | ||
89e00824 ML |
238 | |
239 | /* | |
240 | Local Variables: | |
241 | c-file-style: "gnu" | |
242 | End: | |
243 | */ |