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11d49f54 | 1 | /* Copyright (C) 1995,1996,1998,2000,2001 Free Software Foundation |
1a413ab9 | 2 | * |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
1a413ab9 | 7 | * |
73be1d9e MV |
8 | * This library 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 GNU | |
11 | * Lesser General Public License for more details. | |
1a413ab9 | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
92205699 | 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
73be1d9e | 16 | */ |
6e8d25a6 | 17 | |
1a413ab9 MD |
18 | \f |
19 | ||
a0599745 | 20 | #include "libguile/_scm.h" |
11d49f54 | 21 | #include "libguile/mallocs.h" |
a0599745 | 22 | #include "libguile/strings.h" |
c96d76b8 | 23 | #include "libguile/lang.h" |
1a413ab9 | 24 | |
a0599745 | 25 | #include "libguile/options.h" |
1a413ab9 MD |
26 | \f |
27 | ||
28 | /* {Run-time options} | |
29 | * | |
30 | * This is the basic interface for low-level configuration of the | |
31 | * Guile library. It is used for configuring the reader, evaluator, | |
32 | * printer and debugger. | |
cbff1d89 MD |
33 | * |
34 | * Motivation: | |
35 | * | |
36 | * 1. Altering option settings can have side effects. | |
37 | * 2. Option values can be stored in native format. | |
38 | * (Important for efficiency in, e. g., the evaluator.) | |
39 | * 3. Doesn't use up name space. | |
40 | * 4. Options can be naturally grouped => ease of use. | |
1a413ab9 MD |
41 | */ |
42 | ||
cbff1d89 MD |
43 | /* scm_options is the core of all options interface procedures. |
44 | * | |
45 | * Some definitions: | |
46 | * | |
47 | * Run time options in Guile are arranged in groups. Each group | |
48 | * affects a certain aspect of the behaviour of the library. | |
49 | * | |
50 | * An "options interface procedure" manages one group of options. It | |
51 | * can be used to check or set options, or to get documentation for | |
52 | * all options of a group. The options interface procedure is not | |
53 | * intended to be called directly by the user. The user should | |
54 | * instead call | |
55 | * | |
56 | * (<group>-options) | |
57 | * (<group>-options 'help) | |
58 | * (<group>-options 'full) | |
59 | * | |
60 | * to display current option settings (The second version also | |
61 | * displays documentation. The third version also displays | |
62 | * information about programmer's options.), and | |
63 | * | |
64 | * (<group>-enable '<option-symbol>) | |
65 | * (<group>-disable '<option-symbol>) | |
66 | * (<group>-set! <option-symbol> <value>) | |
67 | * (<group>-options <option setting>) | |
68 | * | |
69 | * to alter the state of an option (The last version sets all | |
70 | * options according to <option setting>.) where <group> is the name | |
71 | * of the option group. | |
72 | * | |
73 | * An "option setting" represents the state of all low-level options | |
74 | * managed by one options interface procedure. It is a list of | |
75 | * single symbols and symbols followed by a value. | |
76 | * | |
77 | * For boolean options, the presence of the symbol of that option in | |
78 | * the option setting indicates a true value. If the symbol isn't a | |
a0fcb308 | 79 | * member of the option setting this represents a false value. |
cbff1d89 | 80 | * |
a0fcb308 | 81 | * Other options are represented by a symbol followed by the value. |
cbff1d89 MD |
82 | * |
83 | * If scm_options is called without arguments, the current option | |
84 | * setting is returned. If the argument is an option setting, options | |
85 | * are altered and the old setting is returned. If the argument isn't | |
86 | * a list, a list of sublists is returned, where each sublist contains | |
87 | * option name, value and documentation string. | |
88 | */ | |
89 | ||
90 | SCM_SYMBOL (scm_yes_sym, "yes"); | |
91 | SCM_SYMBOL (scm_no_sym, "no"); | |
92 | ||
11d49f54 | 93 | static SCM protected_objects = SCM_EOL; |
1cc91f1b | 94 | |
e11e83f3 MV |
95 | /* Return a list of the current option setting. The format of an |
96 | * option setting is described in the above documentation. */ | |
11d49f54 DH |
97 | static SCM |
98 | get_option_setting (const scm_t_option options[], unsigned int n) | |
99 | { | |
100 | unsigned int i; | |
101 | SCM ls = SCM_EOL; | |
102 | for (i = 0; i != n; ++i) | |
103 | { | |
104 | switch (options[i].type) | |
105 | { | |
106 | case SCM_OPTION_BOOLEAN: | |
107 | if (options[i].val) | |
108 | ls = scm_cons (SCM_PACK (options[i].name), ls); | |
109 | break; | |
110 | case SCM_OPTION_INTEGER: | |
e11e83f3 | 111 | ls = scm_cons (scm_from_unsigned_integer (options[i].val), ls); |
11d49f54 DH |
112 | ls = scm_cons (SCM_PACK (options[i].name), ls); |
113 | break; | |
114 | case SCM_OPTION_SCM: | |
115 | ls = scm_cons (SCM_PACK (options[i].val), ls); | |
116 | ls = scm_cons (SCM_PACK (options[i].name), ls); | |
117 | } | |
118 | } | |
119 | return ls; | |
120 | } | |
121 | ||
122 | ||
123 | /* Return a list of sublists, where each sublist contains option name, value | |
124 | * and documentation string. */ | |
125 | static SCM | |
126 | get_documented_option_setting (const scm_t_option options[], unsigned int n) | |
1a413ab9 | 127 | { |
11d49f54 DH |
128 | SCM ans = SCM_EOL; |
129 | unsigned int i; | |
130 | ||
131 | for (i = 0; i != n; ++i) | |
1a413ab9 | 132 | { |
cc95e00a | 133 | SCM ls = scm_cons (scm_from_locale_string (options[i].doc), SCM_EOL); |
cbff1d89 MD |
134 | switch (options[i].type) |
135 | { | |
136 | case SCM_OPTION_BOOLEAN: | |
11d49f54 | 137 | ls = scm_cons (options[i].val ? scm_yes_sym : scm_no_sym, ls); |
cbff1d89 MD |
138 | break; |
139 | case SCM_OPTION_INTEGER: | |
e11e83f3 | 140 | ls = scm_cons (scm_from_unsigned_integer (options[i].val), ls); |
cbff1d89 MD |
141 | break; |
142 | case SCM_OPTION_SCM: | |
11d49f54 | 143 | ls = scm_cons (SCM_PACK (options[i].val), ls); |
cbff1d89 | 144 | } |
11d49f54 DH |
145 | ls = scm_cons (SCM_PACK (options[i].name), ls); |
146 | ans = scm_cons (ls, ans); | |
147 | } | |
148 | return ans; | |
149 | } | |
150 | ||
151 | ||
152 | /* Alters options according to the given option setting 'args'. The value of | |
153 | * args is known to be a list, but it is not known whether the list is a well | |
154 | * formed option setting, i. e. if for every non-boolean option a value is | |
155 | * given. For this reason, the function applies all changes to a copy of the | |
156 | * original setting in memory. Only if 'args' was successfully processed, | |
157 | * the new setting will overwrite the old one. */ | |
158 | static void | |
159 | change_option_setting (SCM args, scm_t_option options[], unsigned int n, const char *s) | |
160 | { | |
161 | unsigned int i; | |
162 | SCM locally_protected_args = args; | |
163 | SCM malloc_obj = scm_malloc_obj (n * sizeof (scm_t_bits)); | |
164 | scm_t_bits *flags = (scm_t_bits *) SCM_MALLOCDATA (malloc_obj); | |
165 | ||
166 | for (i = 0; i != n; ++i) | |
167 | { | |
168 | if (options[i].type == SCM_OPTION_BOOLEAN) | |
169 | flags[i] = 0; | |
170 | else | |
171 | flags[i] = options[i].val; | |
cbff1d89 | 172 | } |
11d49f54 | 173 | |
c96d76b8 | 174 | while (!SCM_NULL_OR_NIL_P (args)) |
cbff1d89 | 175 | { |
11d49f54 DH |
176 | SCM name = SCM_CAR (args); |
177 | int found = 0; | |
178 | ||
179 | for (i = 0; i != n && !found; ++i) | |
1a413ab9 | 180 | { |
bc36d050 | 181 | if (scm_is_eq (name, SCM_PACK (options[i].name))) |
11d49f54 | 182 | { |
1a413ab9 MD |
183 | switch (options[i].type) |
184 | { | |
185 | case SCM_OPTION_BOOLEAN: | |
186 | flags[i] = 1; | |
11d49f54 | 187 | break; |
1a413ab9 | 188 | case SCM_OPTION_INTEGER: |
11d49f54 | 189 | args = SCM_CDR (args); |
a2902ecb | 190 | flags[i] = scm_to_size_t (scm_car (args)); |
11d49f54 | 191 | break; |
cbff1d89 | 192 | case SCM_OPTION_SCM: |
11d49f54 | 193 | args = SCM_CDR (args); |
a2902ecb | 194 | flags[i] = SCM_UNPACK (scm_car (args)); |
11d49f54 | 195 | break; |
1a413ab9 | 196 | } |
11d49f54 DH |
197 | found = 1; |
198 | } | |
1a413ab9 | 199 | } |
11d49f54 DH |
200 | |
201 | if (!found) | |
202 | scm_misc_error (s, "Unknown option name: ~S", scm_list_1 (name)); | |
203 | ||
204 | args = SCM_CDR (args); | |
205 | } | |
206 | ||
207 | for (i = 0; i != n; ++i) | |
208 | { | |
209 | if (options[i].type == SCM_OPTION_SCM) | |
263a691f | 210 | { |
11d49f54 DH |
211 | SCM old = SCM_PACK (options[i].val); |
212 | SCM new = SCM_PACK (flags[i]); | |
213 | if (!SCM_IMP (old)) | |
214 | protected_objects = scm_delq1_x (old, protected_objects); | |
215 | if (!SCM_IMP (new)) | |
216 | protected_objects = scm_cons (new, protected_objects); | |
263a691f | 217 | } |
11d49f54 DH |
218 | options[i].val = flags[i]; |
219 | } | |
220 | ||
221 | scm_remember_upto_here_2 (locally_protected_args, malloc_obj); | |
222 | } | |
223 | ||
224 | ||
225 | SCM | |
226 | scm_options (SCM args, scm_t_option options[], unsigned int n, const char *s) | |
227 | { | |
228 | if (SCM_UNBNDP (args)) | |
229 | return get_option_setting (options, n); | |
d2e53ed6 | 230 | else if (!SCM_NULL_OR_NIL_P (args) && !scm_is_pair (args)) |
11d49f54 DH |
231 | /* Dirk:FIXME:: This criterion should be improved. IMO it is better to |
232 | * demand that args is #t if documentation should be shown than to say | |
233 | * that every argument except a list will print out documentation. */ | |
234 | return get_documented_option_setting (options, n); | |
235 | else | |
236 | { | |
237 | SCM old_setting; | |
7888309b | 238 | SCM_ASSERT (scm_is_true (scm_list_p (args)), args, 1, s); |
11d49f54 DH |
239 | old_setting = get_option_setting (options, n); |
240 | change_option_setting (args, options, n, s); | |
241 | return old_setting; | |
1a413ab9 | 242 | } |
1a413ab9 MD |
243 | } |
244 | ||
1cc91f1b | 245 | |
1a413ab9 | 246 | void |
11d49f54 | 247 | scm_init_opts (SCM (*func) (SCM), scm_t_option options[], unsigned int n) |
1a413ab9 | 248 | { |
11d49f54 | 249 | unsigned int i; |
1a413ab9 | 250 | |
11d49f54 | 251 | for (i = 0; i != n; ++i) |
cbff1d89 | 252 | { |
cc95e00a | 253 | SCM name = scm_from_locale_symbol (options[i].name); |
11d49f54 | 254 | options[i].name = (char *) SCM_UNPACK (name); |
85db4a2c | 255 | scm_permanent_object (name); |
cbff1d89 | 256 | } |
1a413ab9 MD |
257 | func (SCM_UNDEFINED); |
258 | } | |
259 | ||
1cc91f1b | 260 | |
1a413ab9 MD |
261 | void |
262 | scm_init_options () | |
1a413ab9 | 263 | { |
11d49f54 DH |
264 | scm_gc_register_root (&protected_objects); |
265 | ||
a0599745 | 266 | #include "libguile/options.x" |
1a413ab9 | 267 | } |
89e00824 ML |
268 | |
269 | /* | |
270 | Local Variables: | |
271 | c-file-style: "gnu" | |
272 | End: | |
273 | */ |