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 \f
  42
  43 #include "_scm.h"
  44
  45 #include "eval.h"
  46 #include "procprop.h"
  47
  48 #include "modules.h"
  49
  50 static SCM the_root_module;
  51 static SCM root_module_lookup_closure;
  52
  53 SCM
  54 scm_the_root_module ()
  55 {
  56   return SCM_CDR (the_root_module);
  57 }
  58
  59 static SCM the_module;
  60
  61 SCM
  62 scm_selected_module ()
  63 {
  64   return SCM_CDR (the_module);
  65 }
  66
  67 static SCM set_current_module;
  68
  69 SCM
  70 scm_select_module (SCM module)
  71 {
  72   SCM old = scm_selected_module ();
  73   scm_apply (SCM_CDR (set_current_module), SCM_LIST1 (module), SCM_EOL);
  74   return old;
  75 }
  76
  77 SCM_SYMBOL (scm_sym_app, "app");
  78 SCM_SYMBOL (scm_sym_modules, "modules");
  79 static SCM module_prefix;
  80
  81 static SCM
  82 scm_module_full_name (SCM name)
  83 {
  84   if (SCM_CAR (name) == scm_sym_app)
  85     return name;
  86   else
  87     return scm_append (SCM_LIST2 (module_prefix, name));
  88 }
  89
  90 static SCM make_modules_in;
  91 static SCM beautify_user_module_x;
  92
  93 SCM
  94 scm_make_module (SCM name)
  95 {
  96   return scm_apply (SCM_CDR (make_modules_in),
  97                     SCM_LIST2 (scm_the_root_module (),
  98                                scm_module_full_name (name)),
  99                     SCM_EOL);
 100 }
 101
 102 SCM
 103 scm_ensure_user_module (SCM module)
 104 {
 105   scm_apply (SCM_CDR (beautify_user_module_x), SCM_LIST1 (module), SCM_EOL);
 106   return SCM_UNSPECIFIED;
 107 }
 108
 109 static SCM module_eval_closure;
 110
 111 SCM
 112 scm_module_lookup_closure (SCM module)
 113 {
 114   return scm_apply (SCM_CDR (module_eval_closure),
 115                     SCM_LIST1 (module),
 116                     SCM_EOL);
 117 }
 118
 119 static SCM resolve_module;
 120
 121 SCM
 122 scm_resolve_module (SCM name)
 123 {
 124   return scm_apply (SCM_CDR (resolve_module), SCM_LIST1 (name), SCM_EOL);
 125 }
 126
 127 static SCM try_module_autoload;
 128
 129 SCM
 130 scm_load_scheme_module (SCM name)
 131 {
 132   return scm_apply (SCM_CDR (try_module_autoload), SCM_LIST1 (name), SCM_EOL);
 133 }
 134
 135 /* Environments
 136  */
 137
 138 SCM
 139 scm_top_level_env (thunk)
 140      SCM thunk;
 141 {
 142   if (SCM_IMP (thunk))
 143     return SCM_EOL;
 144   else
 145     return scm_cons (thunk, SCM_EOL);
 146 }
 147
 148 SCM
 149 scm_env_top_level (SCM env)
 150 {
 151   while (SCM_NIMP (env))
 152     {
 153       if (!SCM_CONSP (SCM_CAR (env))
 154           && SCM_NFALSEP (scm_procedure_p (SCM_CAR (env))))
 155         return SCM_CAR(env);
 156       env = SCM_CDR (env);
 157     }
 158   return SCM_BOOL_F;
 159 }
 160
 161
 162 SCM_SYMBOL (scm_sym_system_module, "system-module");
 163
 164 SCM
 165 scm_system_module_env_p (SCM env)
 166 {
 167   SCM proc = scm_env_top_level (env);
 168   if (SCM_FALSEP (proc))
 169     proc = root_module_lookup_closure;
 170   return ((SCM_NFALSEP (scm_procedure_property (proc,
 171                                                 scm_sym_system_module)))
 172           ? SCM_BOOL_T
 173           : SCM_BOOL_F);
 174 }
 175
 176 void
 177 scm_init_modules ()
 178 {
 179 #include "modules.x"
 180 }
 181
 182 void
 183 scm_post_boot_init_modules ()
 184 {
 185   the_root_module = scm_intern0 ("the-root-module");
 186   the_module = scm_intern0 ("the-module");
 187   set_current_module = scm_intern0 ("set-current-module");
 188   module_prefix = scm_permanent_object (SCM_LIST2 (scm_sym_app,
 189                                                    scm_sym_modules));
 190   make_modules_in = scm_intern0 ("make-modules-in");
 191   beautify_user_module_x = scm_intern0 ("beautify-user-module!");
 192   module_eval_closure = scm_intern0 ("module-eval-closure");
 193   root_module_lookup_closure = scm_permanent_object
 194     (scm_module_lookup_closure (SCM_CDR (the_root_module)));
 195   resolve_module = scm_intern0 ("resolve-module");
 196   try_module_autoload = scm_intern0 ("try-module-autoload");
 197 }