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7dc6e754 | 1 | /* Copyright (C) 1995, 1996, 1998 Free Software Foundation |
1a413ab9 MD |
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 | |
1a413ab9 MD |
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. | |
40 | * If you do not wish that, delete this exception notice. | |
41 | * | |
42 | * The author can be reached at djurfeldt@nada.kth.se | |
82892bed | 43 | * Mikael Djurfeldt, SANS/NADA KTH, 10044 STOCKHOLM, SWEDEN */ |
1a413ab9 MD |
44 | \f |
45 | ||
46 | #include <stdio.h> | |
47 | #include "_scm.h" | |
48 | ||
20e6290e | 49 | #include "options.h" |
1a413ab9 MD |
50 | \f |
51 | ||
52 | /* {Run-time options} | |
53 | * | |
54 | * This is the basic interface for low-level configuration of the | |
55 | * Guile library. It is used for configuring the reader, evaluator, | |
56 | * printer and debugger. | |
cbff1d89 MD |
57 | * |
58 | * Motivation: | |
59 | * | |
60 | * 1. Altering option settings can have side effects. | |
61 | * 2. Option values can be stored in native format. | |
62 | * (Important for efficiency in, e. g., the evaluator.) | |
63 | * 3. Doesn't use up name space. | |
64 | * 4. Options can be naturally grouped => ease of use. | |
1a413ab9 MD |
65 | */ |
66 | ||
cbff1d89 MD |
67 | /* scm_options is the core of all options interface procedures. |
68 | * | |
69 | * Some definitions: | |
70 | * | |
71 | * Run time options in Guile are arranged in groups. Each group | |
72 | * affects a certain aspect of the behaviour of the library. | |
73 | * | |
74 | * An "options interface procedure" manages one group of options. It | |
75 | * can be used to check or set options, or to get documentation for | |
76 | * all options of a group. The options interface procedure is not | |
77 | * intended to be called directly by the user. The user should | |
78 | * instead call | |
79 | * | |
80 | * (<group>-options) | |
81 | * (<group>-options 'help) | |
82 | * (<group>-options 'full) | |
83 | * | |
84 | * to display current option settings (The second version also | |
85 | * displays documentation. The third version also displays | |
86 | * information about programmer's options.), and | |
87 | * | |
88 | * (<group>-enable '<option-symbol>) | |
89 | * (<group>-disable '<option-symbol>) | |
90 | * (<group>-set! <option-symbol> <value>) | |
91 | * (<group>-options <option setting>) | |
92 | * | |
93 | * to alter the state of an option (The last version sets all | |
94 | * options according to <option setting>.) where <group> is the name | |
95 | * of the option group. | |
96 | * | |
97 | * An "option setting" represents the state of all low-level options | |
98 | * managed by one options interface procedure. It is a list of | |
99 | * single symbols and symbols followed by a value. | |
100 | * | |
101 | * For boolean options, the presence of the symbol of that option in | |
102 | * the option setting indicates a true value. If the symbol isn't a | |
a0fcb308 | 103 | * member of the option setting this represents a false value. |
cbff1d89 | 104 | * |
a0fcb308 | 105 | * Other options are represented by a symbol followed by the value. |
cbff1d89 MD |
106 | * |
107 | * If scm_options is called without arguments, the current option | |
108 | * setting is returned. If the argument is an option setting, options | |
109 | * are altered and the old setting is returned. If the argument isn't | |
110 | * a list, a list of sublists is returned, where each sublist contains | |
111 | * option name, value and documentation string. | |
112 | */ | |
113 | ||
114 | SCM_SYMBOL (scm_yes_sym, "yes"); | |
115 | SCM_SYMBOL (scm_no_sym, "no"); | |
116 | ||
263a691f | 117 | static SCM protected_objects; |
1cc91f1b | 118 | |
1a413ab9 | 119 | SCM |
263a691f MD |
120 | scm_options (arg, options, n, s) |
121 | SCM arg; | |
1a413ab9 MD |
122 | scm_option options[]; |
123 | int n; | |
3eeba8d4 | 124 | const char *s; |
1a413ab9 | 125 | { |
263a691f MD |
126 | int i, docp = (!SCM_UNBNDP (arg) |
127 | && !SCM_NULLP (arg) | |
128 | && (SCM_IMP (arg) || SCM_NCONSP (arg))); | |
129 | /* Let `arg' GC protect the arguments */ | |
130 | SCM new_mode = arg, ans = SCM_EOL, ls; | |
1a413ab9 | 131 | for (i = 0; i < n; ++i) |
1a413ab9 | 132 | { |
cbff1d89 MD |
133 | ls = docp ? scm_cons ((SCM) options[i].doc, SCM_EOL) : ans; |
134 | switch (options[i].type) | |
135 | { | |
136 | case SCM_OPTION_BOOLEAN: | |
137 | if (docp) | |
138 | ls = scm_cons ((int) options[i].val | |
139 | ? scm_yes_sym | |
140 | : scm_no_sym, | |
141 | ls); | |
142 | break; | |
143 | case SCM_OPTION_INTEGER: | |
144 | ls = scm_cons (SCM_MAKINUM ((int) options[i].val), ls); | |
145 | break; | |
146 | case SCM_OPTION_SCM: | |
147 | ls = scm_cons ((SCM) options[i].val, ls); | |
148 | } | |
149 | if (!((options[i].type == SCM_OPTION_BOOLEAN) | |
150 | && !docp | |
151 | && ! (int) options[i].val)) | |
152 | ls = scm_cons ((SCM) options[i].name, ls); | |
153 | ans = docp ? scm_cons (ls, ans) : ls; | |
154 | } | |
155 | if (!(SCM_UNBNDP (new_mode) || docp)) | |
156 | { | |
157 | unsigned long *flags; | |
158 | flags = (unsigned long *) scm_must_malloc (n * sizeof (unsigned long), | |
159 | "mode buffer"); | |
1a413ab9 MD |
160 | for (i = 0; i < n; ++i) |
161 | if (options[i].type == SCM_OPTION_BOOLEAN) | |
162 | flags[i] = 0; | |
163 | else | |
cbff1d89 | 164 | flags[i] = (unsigned long) options[i].val; |
1a413ab9 MD |
165 | while (SCM_NNULLP (new_mode)) |
166 | { | |
167 | SCM_ASSERT (SCM_NIMP (new_mode) && SCM_CONSP (new_mode), | |
168 | new_mode, | |
169 | SCM_ARG1, | |
170 | s); | |
171 | for (i = 0; i < n; ++i) | |
cbff1d89 | 172 | if (SCM_CAR (new_mode) == (SCM) options[i].name) |
1a413ab9 MD |
173 | switch (options[i].type) |
174 | { | |
175 | case SCM_OPTION_BOOLEAN: | |
176 | flags[i] = 1; | |
177 | goto cont; | |
178 | case SCM_OPTION_INTEGER: | |
179 | new_mode = SCM_CDR (new_mode); | |
180 | SCM_ASSERT (SCM_NIMP (new_mode) | |
181 | && SCM_CONSP (new_mode) | |
182 | && SCM_INUMP (SCM_CAR (new_mode)), | |
183 | new_mode, | |
184 | SCM_ARG1, | |
185 | s); | |
cbff1d89 MD |
186 | flags[i] = (unsigned long) SCM_INUM (SCM_CAR (new_mode)); |
187 | goto cont; | |
188 | case SCM_OPTION_SCM: | |
189 | new_mode = SCM_CDR (new_mode); | |
190 | flags[i] = SCM_CAR (new_mode); | |
1a413ab9 MD |
191 | goto cont; |
192 | } | |
cf7c17e9 | 193 | #ifndef SCM_RECKLESS |
1a413ab9 MD |
194 | scm_must_free ((char *) flags); |
195 | scm_wta (SCM_CAR (new_mode), "Unknown mode flag", s); | |
196 | #endif | |
197 | cont: | |
198 | new_mode = SCM_CDR (new_mode); | |
199 | } | |
263a691f MD |
200 | for (i = 0; i < n; ++i) |
201 | { | |
202 | if (options[i].type == SCM_OPTION_SCM) | |
203 | SCM_SETCDR (protected_objects, | |
204 | scm_cons (flags[i], | |
205 | scm_delq1_x (options[i].val, | |
206 | SCM_CDR (protected_objects)))); | |
207 | options[i].val = flags[i]; | |
208 | } | |
1a413ab9 MD |
209 | scm_must_free ((char *) flags); |
210 | } | |
cbff1d89 | 211 | return ans; |
1a413ab9 MD |
212 | } |
213 | ||
1cc91f1b | 214 | |
1a413ab9 MD |
215 | void |
216 | scm_init_opts (func, options, n) | |
217 | SCM (*func) (SCM); | |
218 | scm_option options[]; | |
219 | int n; | |
1a413ab9 MD |
220 | { |
221 | int i; | |
222 | ||
223 | for (i = 0; i < n; ++i) | |
cbff1d89 | 224 | { |
5aab5d96 | 225 | options[i].name = (char *) SCM_CAR (scm_sysintern0 (options[i].name)); |
cbff1d89 MD |
226 | options[i].doc = (char *) scm_permanent_object (scm_take0str |
227 | (options[i].doc)); | |
263a691f MD |
228 | if (options[i].type == SCM_OPTION_SCM) |
229 | SCM_SETCDR (protected_objects, | |
230 | scm_cons (options[i].val, SCM_CDR (protected_objects))); | |
cbff1d89 | 231 | } |
1a413ab9 MD |
232 | func (SCM_UNDEFINED); |
233 | } | |
234 | ||
1cc91f1b | 235 | |
1a413ab9 MD |
236 | void |
237 | scm_init_options () | |
1a413ab9 | 238 | { |
263a691f | 239 | protected_objects = scm_permanent_object (scm_cons (SCM_UNDEFINED, SCM_EOL)); |
1a413ab9 MD |
240 | #include "options.x" |
241 | } |