* *.c: Finish replacing K&R style prototypes with ANSI C
[bpt/guile.git] / libguile / modules.c
1 /* Copyright (C) 1998 Free Software Foundation, Inc.
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
15 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
16 * Boston, MA 02111-1307 USA
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 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
43 gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
44
45 \f
46
47 #include "_scm.h"
48
49 #include "eval.h"
50 #include "procprop.h"
51
52 #include "modules.h"
53
54 static SCM the_root_module;
55 static SCM root_module_lookup_closure;
56
57 SCM
58 scm_the_root_module ()
59 {
60 return SCM_CDR (the_root_module);
61 }
62
63 static SCM the_module;
64
65 SCM
66 scm_selected_module ()
67 {
68 return SCM_CDR (the_module);
69 }
70
71 static SCM set_current_module;
72
73 SCM
74 scm_select_module (SCM module)
75 {
76 SCM old = scm_selected_module ();
77 scm_apply (SCM_CDR (set_current_module), SCM_LIST1 (module), SCM_EOL);
78 return old;
79 }
80
81 SCM_SYMBOL (scm_sym_app, "app");
82 SCM_SYMBOL (scm_sym_modules, "modules");
83 static SCM module_prefix;
84
85 static SCM
86 scm_module_full_name (SCM name)
87 {
88 if (SCM_CAR (name) == scm_sym_app)
89 return name;
90 else
91 return scm_append (SCM_LIST2 (module_prefix, name));
92 }
93
94 static SCM make_modules_in;
95 static SCM beautify_user_module_x;
96
97 SCM
98 scm_make_module (SCM name)
99 {
100 return scm_apply (SCM_CDR (make_modules_in),
101 SCM_LIST2 (scm_the_root_module (),
102 scm_module_full_name (name)),
103 SCM_EOL);
104 }
105
106 SCM
107 scm_ensure_user_module (SCM module)
108 {
109 scm_apply (SCM_CDR (beautify_user_module_x), SCM_LIST1 (module), SCM_EOL);
110 return SCM_UNSPECIFIED;
111 }
112
113 static SCM module_eval_closure;
114
115 SCM
116 scm_module_lookup_closure (SCM module)
117 {
118 return scm_apply (SCM_CDR (module_eval_closure),
119 SCM_LIST1 (module),
120 SCM_EOL);
121 }
122
123 static SCM resolve_module;
124
125 SCM
126 scm_resolve_module (SCM name)
127 {
128 return scm_apply (SCM_CDR (resolve_module), SCM_LIST1 (name), SCM_EOL);
129 }
130
131 static SCM try_module_autoload;
132
133 SCM
134 scm_load_scheme_module (SCM name)
135 {
136 return scm_apply (SCM_CDR (try_module_autoload), SCM_LIST1 (name), SCM_EOL);
137 }
138
139 /* Environments
140 */
141
142 SCM
143 scm_top_level_env (SCM thunk)
144 {
145 if (SCM_IMP (thunk))
146 return SCM_EOL;
147 else
148 return scm_cons (thunk, SCM_EOL);
149 }
150
151 SCM
152 scm_env_top_level (SCM env)
153 {
154 while (SCM_NIMP (env))
155 {
156 if (!SCM_CONSP (SCM_CAR (env))
157 && SCM_NFALSEP (scm_procedure_p (SCM_CAR (env))))
158 return SCM_CAR(env);
159 env = SCM_CDR (env);
160 }
161 return SCM_BOOL_F;
162 }
163
164
165 SCM_SYMBOL (scm_sym_system_module, "system-module");
166
167 SCM
168 scm_system_module_env_p (SCM env)
169 {
170 SCM proc = scm_env_top_level (env);
171 if (SCM_FALSEP (proc))
172 proc = root_module_lookup_closure;
173 return ((SCM_NFALSEP (scm_procedure_property (proc,
174 scm_sym_system_module)))
175 ? SCM_BOOL_T
176 : SCM_BOOL_F);
177 }
178
179 void
180 scm_init_modules ()
181 {
182 #include "modules.x"
183 }
184
185 void
186 scm_post_boot_init_modules ()
187 {
188 the_root_module = scm_intern0 ("the-root-module");
189 the_module = scm_intern0 ("the-module");
190 set_current_module = scm_intern0 ("set-current-module");
191 module_prefix = scm_permanent_object (SCM_LIST2 (scm_sym_app,
192 scm_sym_modules));
193 make_modules_in = scm_intern0 ("make-modules-in");
194 beautify_user_module_x = scm_intern0 ("beautify-user-module!");
195 module_eval_closure = scm_intern0 ("module-eval-closure");
196 root_module_lookup_closure = scm_permanent_object
197 (scm_module_lookup_closure (SCM_CDR (the_root_module)));
198 resolve_module = scm_intern0 ("resolve-module");
199 try_module_autoload = scm_intern0 ("try-module-autoload");
200 }