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7dc6e754 | 1 | /* Copyright (C) 1995, 1996, 1997, 1998 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> | |
48 | #include "_scm.h" | |
a7254b72 | 49 | #include "eq.h" |
20e6290e JB |
50 | #include "genio.h" |
51 | #include "smob.h" | |
0f2d19dd | 52 | |
1bbd0b84 | 53 | #include "scm_validate.h" |
20e6290e | 54 | #include "variable.h" |
0f2d19dd | 55 | \f |
1cc91f1b | 56 | |
0f2d19dd | 57 | static int |
1bbd0b84 | 58 | prin_var (SCM exp,SCM port,scm_print_state *pstate) |
0f2d19dd | 59 | { |
b7f3516f | 60 | scm_puts ("#<variable ", port); |
0f2d19dd JB |
61 | scm_intprint(exp, 16, port); |
62 | { | |
63 | SCM val_cell; | |
64 | val_cell = SCM_CDR(exp); | |
65 | if (SCM_CAR (val_cell) != SCM_UNDEFINED) | |
66 | { | |
b7f3516f | 67 | scm_puts (" name: ", port); |
9882ea19 | 68 | scm_iprin1 (SCM_CAR (val_cell), port, pstate); |
0f2d19dd | 69 | } |
b7f3516f | 70 | scm_puts (" binding: ", port); |
9882ea19 | 71 | scm_iprin1 (SCM_CDR (val_cell), port, pstate); |
0f2d19dd | 72 | } |
b7f3516f | 73 | scm_putc('>', port); |
0f2d19dd JB |
74 | return 1; |
75 | } | |
76 | ||
1cc91f1b | 77 | |
0f2d19dd | 78 | static SCM |
1bbd0b84 | 79 | scm_markvar (SCM ptr) |
0f2d19dd | 80 | { |
0f2d19dd JB |
81 | return SCM_CDR (ptr); |
82 | } | |
83 | ||
a7254b72 | 84 | static SCM |
1bbd0b84 | 85 | var_equal (SCM var1, SCM var2) |
a7254b72 JB |
86 | { |
87 | return scm_equal_p (SCM_CDR (var1), SCM_CDR (var2)); | |
88 | } | |
89 | ||
0f2d19dd | 90 | int scm_tc16_variable; |
0f2d19dd JB |
91 | \f |
92 | ||
0179ae48 | 93 | static SCM anonymous_variable_sym; |
0f2d19dd | 94 | |
1cc91f1b | 95 | |
0f2d19dd | 96 | static SCM |
1bbd0b84 | 97 | make_vcell_variable (SCM vcell) |
0f2d19dd | 98 | { |
23a62151 | 99 | SCM_RETURN_NEWSMOB (scm_tc16_variable, vcell); |
0f2d19dd JB |
100 | } |
101 | ||
3b3b36dd | 102 | SCM_DEFINE (scm_make_variable, "make-variable", 1, 1, 0, |
d727c64b GB |
103 | (SCM init, SCM name_hint), |
104 | "Return a variable object initialized to value INIT.\n" | |
105 | "If given, uses NAME-HINT as its internal (debugging)\n" | |
106 | "name, otherwise just treat it as an anonymous variable.\n" | |
107 | "Remember, of course, that multiple bindings to the same\n" | |
b450f070 | 108 | "variable may exist, so NAME-HINT is just that---a hint.\n") |
1bbd0b84 | 109 | #define FUNC_NAME s_scm_make_variable |
0f2d19dd JB |
110 | { |
111 | SCM val_cell; | |
0179ae48 JB |
112 | |
113 | if (name_hint == SCM_UNDEFINED) | |
114 | name_hint = anonymous_variable_sym; | |
115 | ||
0f2d19dd JB |
116 | SCM_NEWCELL(val_cell); |
117 | SCM_DEFER_INTS; | |
a6c64c3c MD |
118 | SCM_SETCAR (val_cell, name_hint); |
119 | SCM_SETCDR (val_cell, init); | |
0f2d19dd JB |
120 | SCM_ALLOW_INTS; |
121 | return make_vcell_variable (val_cell); | |
122 | } | |
1bbd0b84 | 123 | #undef FUNC_NAME |
0f2d19dd JB |
124 | |
125 | ||
3b3b36dd | 126 | SCM_DEFINE (scm_make_undefined_variable, "make-undefined-variable", 0, 1, 0, |
d727c64b GB |
127 | (SCM name_hint), |
128 | "Return a variable object initialized to an undefined value.\n" | |
129 | "If given, uses NAME-HINT as its internal (debugging)\n" | |
130 | "name, otherwise just treat it as an anonymous variable.\n" | |
131 | "Remember, of course, that multiple bindings to the same\n" | |
b450f070 | 132 | "variable may exist, so NAME-HINT is just that---a hint.\n") |
1bbd0b84 | 133 | #define FUNC_NAME s_scm_make_undefined_variable |
0f2d19dd JB |
134 | { |
135 | SCM vcell; | |
136 | ||
137 | if (name_hint == SCM_UNDEFINED) | |
0179ae48 | 138 | name_hint = anonymous_variable_sym; |
0f2d19dd JB |
139 | |
140 | SCM_NEWCELL (vcell); | |
141 | SCM_DEFER_INTS; | |
a6c64c3c MD |
142 | SCM_SETCAR (vcell, name_hint); |
143 | SCM_SETCDR (vcell, SCM_UNDEFINED); | |
0f2d19dd JB |
144 | SCM_ALLOW_INTS; |
145 | return make_vcell_variable (vcell); | |
146 | } | |
1bbd0b84 | 147 | #undef FUNC_NAME |
0f2d19dd JB |
148 | |
149 | ||
3b3b36dd | 150 | SCM_DEFINE (scm_variable_p, "variable?", 1, 0, 0, |
d727c64b GB |
151 | (SCM obj), |
152 | "Return #t iff OBJ is a variable object, else return #f\n") | |
1bbd0b84 | 153 | #define FUNC_NAME s_scm_variable_p |
0f2d19dd | 154 | { |
0c95b57d | 155 | return SCM_BOOL(SCM_VARIABLEP (obj)); |
0f2d19dd | 156 | } |
1bbd0b84 | 157 | #undef FUNC_NAME |
0f2d19dd JB |
158 | |
159 | ||
3b3b36dd | 160 | SCM_DEFINE (scm_variable_ref, "variable-ref", 1, 0, 0, |
d727c64b GB |
161 | (SCM var), |
162 | "Dereference VAR and return its value.\n" | |
163 | "VAR must be a variable object; see `make-variable' and\n" | |
164 | "`make-undefined-variable'") | |
1bbd0b84 | 165 | #define FUNC_NAME s_scm_variable_ref |
0f2d19dd | 166 | { |
3b3b36dd | 167 | SCM_VALIDATE_VARIABLE (1,var); |
0f2d19dd JB |
168 | return SCM_CDR (SCM_CDR (var)); |
169 | } | |
1bbd0b84 | 170 | #undef FUNC_NAME |
0f2d19dd JB |
171 | |
172 | ||
173 | ||
3b3b36dd | 174 | SCM_DEFINE (scm_variable_set_x, "variable-set!", 2, 0, 0, |
d727c64b GB |
175 | (SCM var, SCM val), |
176 | "Set the value of the variable VAR to VAL.\n" | |
177 | "VAR must be a variable object, VAL can be any value.\n" | |
b450f070 | 178 | "Returns an unspecified value.\n") |
1bbd0b84 | 179 | #define FUNC_NAME s_scm_variable_set_x |
0f2d19dd | 180 | { |
3b3b36dd | 181 | SCM_VALIDATE_VARIABLE (1,var); |
a6c64c3c | 182 | SCM_SETCDR (SCM_CDR (var), val); |
0f2d19dd JB |
183 | return SCM_UNSPECIFIED; |
184 | } | |
1bbd0b84 | 185 | #undef FUNC_NAME |
0f2d19dd JB |
186 | |
187 | ||
3b3b36dd | 188 | SCM_DEFINE (scm_builtin_variable, "builtin-variable", 1, 0, 0, |
d727c64b GB |
189 | (SCM name), |
190 | "Return the built-in variable with the name NAME.\n" | |
191 | "NAME must be a symbol (not a string).\n" | |
b450f070 | 192 | "Then use `variable-ref' to access its value.\n") |
1bbd0b84 | 193 | #define FUNC_NAME s_scm_builtin_variable |
0f2d19dd JB |
194 | { |
195 | SCM vcell; | |
196 | SCM var_slot; | |
197 | ||
3b3b36dd | 198 | SCM_VALIDATE_SYMBOL (1,name); |
0f2d19dd JB |
199 | vcell = scm_sym2vcell (name, SCM_BOOL_F, SCM_BOOL_T); |
200 | if (vcell == SCM_BOOL_F) | |
201 | return SCM_BOOL_F; | |
202 | ||
203 | scm_intern_symbol (scm_symhash_vars, name); | |
204 | var_slot = scm_sym2ovcell (name, scm_symhash_vars); | |
205 | ||
206 | SCM_DEFER_INTS; | |
207 | if ( SCM_IMP (SCM_CDR (var_slot)) | |
208 | || (SCM_VARVCELL (var_slot) != vcell)) | |
a6c64c3c | 209 | SCM_SETCDR (var_slot, make_vcell_variable (vcell)); |
0f2d19dd JB |
210 | SCM_ALLOW_INTS; |
211 | ||
212 | return SCM_CDR (var_slot); | |
213 | } | |
1bbd0b84 | 214 | #undef FUNC_NAME |
0f2d19dd JB |
215 | |
216 | ||
3b3b36dd | 217 | SCM_DEFINE (scm_variable_bound_p, "variable-bound?", 1, 0, 0, |
d727c64b GB |
218 | (SCM var), |
219 | "Return #t iff VAR is bound to a value.\n" | |
b450f070 | 220 | "Throws an error if VAR is not a variable object.\n") |
1bbd0b84 | 221 | #define FUNC_NAME s_scm_variable_bound_p |
0f2d19dd | 222 | { |
3b3b36dd | 223 | SCM_VALIDATE_VARIABLE (1,var); |
1bbd0b84 | 224 | return SCM_NEGATE_BOOL(SCM_UNBNDP (SCM_CDR (SCM_VARVCELL (var)))); |
0f2d19dd | 225 | } |
1bbd0b84 | 226 | #undef FUNC_NAME |
0f2d19dd JB |
227 | |
228 | ||
229 | ||
1cc91f1b | 230 | |
0f2d19dd JB |
231 | void |
232 | scm_init_variable () | |
0f2d19dd | 233 | { |
23a62151 MD |
234 | scm_tc16_variable = scm_make_smob_type_mfpe ("variable", 0, |
235 | scm_markvar, NULL, prin_var, var_equal); | |
0179ae48 | 236 | anonymous_variable_sym = SCM_CAR (scm_sysintern ("anonymous-variable", SCM_UNDEFINED)); |
0f2d19dd JB |
237 | #include "variable.x" |
238 | } | |
239 |