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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 */ |
6e8d25a6 GB |
44 | |
45 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
46 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
47 | ||
1a413ab9 MD |
48 | \f |
49 | ||
50 | #include <stdio.h> | |
51 | #include "_scm.h" | |
7ab3fdd5 | 52 | #include "strings.h" |
1a413ab9 | 53 | |
20e6290e | 54 | #include "options.h" |
1a413ab9 MD |
55 | \f |
56 | ||
57 | /* {Run-time options} | |
58 | * | |
59 | * This is the basic interface for low-level configuration of the | |
60 | * Guile library. It is used for configuring the reader, evaluator, | |
61 | * printer and debugger. | |
cbff1d89 MD |
62 | * |
63 | * Motivation: | |
64 | * | |
65 | * 1. Altering option settings can have side effects. | |
66 | * 2. Option values can be stored in native format. | |
67 | * (Important for efficiency in, e. g., the evaluator.) | |
68 | * 3. Doesn't use up name space. | |
69 | * 4. Options can be naturally grouped => ease of use. | |
1a413ab9 MD |
70 | */ |
71 | ||
cbff1d89 MD |
72 | /* scm_options is the core of all options interface procedures. |
73 | * | |
74 | * Some definitions: | |
75 | * | |
76 | * Run time options in Guile are arranged in groups. Each group | |
77 | * affects a certain aspect of the behaviour of the library. | |
78 | * | |
79 | * An "options interface procedure" manages one group of options. It | |
80 | * can be used to check or set options, or to get documentation for | |
81 | * all options of a group. The options interface procedure is not | |
82 | * intended to be called directly by the user. The user should | |
83 | * instead call | |
84 | * | |
85 | * (<group>-options) | |
86 | * (<group>-options 'help) | |
87 | * (<group>-options 'full) | |
88 | * | |
89 | * to display current option settings (The second version also | |
90 | * displays documentation. The third version also displays | |
91 | * information about programmer's options.), and | |
92 | * | |
93 | * (<group>-enable '<option-symbol>) | |
94 | * (<group>-disable '<option-symbol>) | |
95 | * (<group>-set! <option-symbol> <value>) | |
96 | * (<group>-options <option setting>) | |
97 | * | |
98 | * to alter the state of an option (The last version sets all | |
99 | * options according to <option setting>.) where <group> is the name | |
100 | * of the option group. | |
101 | * | |
102 | * An "option setting" represents the state of all low-level options | |
103 | * managed by one options interface procedure. It is a list of | |
104 | * single symbols and symbols followed by a value. | |
105 | * | |
106 | * For boolean options, the presence of the symbol of that option in | |
107 | * the option setting indicates a true value. If the symbol isn't a | |
a0fcb308 | 108 | * member of the option setting this represents a false value. |
cbff1d89 | 109 | * |
a0fcb308 | 110 | * Other options are represented by a symbol followed by the value. |
cbff1d89 MD |
111 | * |
112 | * If scm_options is called without arguments, the current option | |
113 | * setting is returned. If the argument is an option setting, options | |
114 | * are altered and the old setting is returned. If the argument isn't | |
115 | * a list, a list of sublists is returned, where each sublist contains | |
116 | * option name, value and documentation string. | |
117 | */ | |
118 | ||
119 | SCM_SYMBOL (scm_yes_sym, "yes"); | |
120 | SCM_SYMBOL (scm_no_sym, "no"); | |
121 | ||
263a691f | 122 | static SCM protected_objects; |
1cc91f1b | 123 | |
1a413ab9 | 124 | SCM |
6e8d25a6 | 125 | scm_options (SCM arg, scm_option options[], int n, const char *s) |
1a413ab9 | 126 | { |
fee7ef83 | 127 | int i, docp = (!SCM_UNBNDP (arg) && !SCM_NULLP (arg) && !SCM_CONSP (arg)); |
263a691f MD |
128 | /* Let `arg' GC protect the arguments */ |
129 | SCM new_mode = arg, ans = SCM_EOL, ls; | |
1a413ab9 | 130 | for (i = 0; i < n; ++i) |
1a413ab9 | 131 | { |
cbff1d89 MD |
132 | ls = docp ? scm_cons ((SCM) options[i].doc, SCM_EOL) : ans; |
133 | switch (options[i].type) | |
134 | { | |
135 | case SCM_OPTION_BOOLEAN: | |
136 | if (docp) | |
137 | ls = scm_cons ((int) options[i].val | |
138 | ? scm_yes_sym | |
139 | : scm_no_sym, | |
140 | ls); | |
141 | break; | |
142 | case SCM_OPTION_INTEGER: | |
143 | ls = scm_cons (SCM_MAKINUM ((int) options[i].val), ls); | |
144 | break; | |
145 | case SCM_OPTION_SCM: | |
146 | ls = scm_cons ((SCM) options[i].val, ls); | |
147 | } | |
148 | if (!((options[i].type == SCM_OPTION_BOOLEAN) | |
149 | && !docp | |
150 | && ! (int) options[i].val)) | |
151 | ls = scm_cons ((SCM) options[i].name, ls); | |
152 | ans = docp ? scm_cons (ls, ans) : ls; | |
153 | } | |
154 | if (!(SCM_UNBNDP (new_mode) || docp)) | |
155 | { | |
156 | unsigned long *flags; | |
157 | flags = (unsigned long *) scm_must_malloc (n * sizeof (unsigned long), | |
158 | "mode buffer"); | |
1a413ab9 MD |
159 | for (i = 0; i < n; ++i) |
160 | if (options[i].type == SCM_OPTION_BOOLEAN) | |
161 | flags[i] = 0; | |
162 | else | |
cbff1d89 | 163 | flags[i] = (unsigned long) options[i].val; |
1a413ab9 MD |
164 | while (SCM_NNULLP (new_mode)) |
165 | { | |
0c95b57d | 166 | SCM_ASSERT (SCM_CONSP (new_mode), |
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167 | new_mode, |
168 | SCM_ARG1, | |
169 | s); | |
170 | for (i = 0; i < n; ++i) | |
cbff1d89 | 171 | if (SCM_CAR (new_mode) == (SCM) options[i].name) |
1a413ab9 MD |
172 | switch (options[i].type) |
173 | { | |
174 | case SCM_OPTION_BOOLEAN: | |
175 | flags[i] = 1; | |
176 | goto cont; | |
177 | case SCM_OPTION_INTEGER: | |
178 | new_mode = SCM_CDR (new_mode); | |
0b5f3f34 | 179 | SCM_ASSERT ( SCM_CONSP (new_mode) |
1a413ab9 MD |
180 | && SCM_INUMP (SCM_CAR (new_mode)), |
181 | new_mode, | |
182 | SCM_ARG1, | |
183 | s); | |
cbff1d89 MD |
184 | flags[i] = (unsigned long) SCM_INUM (SCM_CAR (new_mode)); |
185 | goto cont; | |
186 | case SCM_OPTION_SCM: | |
187 | new_mode = SCM_CDR (new_mode); | |
f1267706 | 188 | flags[i] = SCM_UNPACK_CAR (new_mode); |
1a413ab9 MD |
189 | goto cont; |
190 | } | |
cf7c17e9 | 191 | #ifndef SCM_RECKLESS |
1a413ab9 MD |
192 | scm_must_free ((char *) flags); |
193 | scm_wta (SCM_CAR (new_mode), "Unknown mode flag", s); | |
194 | #endif | |
195 | cont: | |
196 | new_mode = SCM_CDR (new_mode); | |
197 | } | |
263a691f MD |
198 | for (i = 0; i < n; ++i) |
199 | { | |
7febb4a2 | 200 | /* scm_option doesn't know if its a long or an SCM */ |
263a691f MD |
201 | if (options[i].type == SCM_OPTION_SCM) |
202 | SCM_SETCDR (protected_objects, | |
f1267706 MD |
203 | scm_cons (SCM_PACK(flags[i]), |
204 | scm_delq1_x (SCM_PACK(options[i].val), | |
263a691f MD |
205 | SCM_CDR (protected_objects)))); |
206 | options[i].val = flags[i]; | |
207 | } | |
1a413ab9 MD |
208 | scm_must_free ((char *) flags); |
209 | } | |
cbff1d89 | 210 | return ans; |
1a413ab9 MD |
211 | } |
212 | ||
1cc91f1b | 213 | |
1a413ab9 | 214 | void |
6e8d25a6 | 215 | scm_init_opts (SCM (*func) (SCM), scm_option options[], int n) |
1a413ab9 MD |
216 | { |
217 | int i; | |
218 | ||
219 | for (i = 0; i < n; ++i) | |
cbff1d89 | 220 | { |
5aab5d96 | 221 | options[i].name = (char *) SCM_CAR (scm_sysintern0 (options[i].name)); |
cbff1d89 MD |
222 | options[i].doc = (char *) scm_permanent_object (scm_take0str |
223 | (options[i].doc)); | |
263a691f MD |
224 | if (options[i].type == SCM_OPTION_SCM) |
225 | SCM_SETCDR (protected_objects, | |
f1267706 | 226 | scm_cons (SCM_PACK(options[i].val), SCM_CDR (protected_objects))); |
cbff1d89 | 227 | } |
1a413ab9 MD |
228 | func (SCM_UNDEFINED); |
229 | } | |
230 | ||
1cc91f1b | 231 | |
1a413ab9 MD |
232 | void |
233 | scm_init_options () | |
1a413ab9 | 234 | { |
263a691f | 235 | protected_objects = scm_permanent_object (scm_cons (SCM_UNDEFINED, SCM_EOL)); |
1a413ab9 MD |
236 | #include "options.x" |
237 | } | |
89e00824 ML |
238 | |
239 | /* | |
240 | Local Variables: | |
241 | c-file-style: "gnu" | |
242 | End: | |
243 | */ |