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/* Copyright (C) 1998, 2000 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
#include "libguile/_scm.h"
#include "libguile/eval.h"
#include "libguile/smob.h"
#include "libguile/procprop.h"
#include "libguile/vectors.h"
#include "libguile/hashtab.h"
#include "libguile/struct.h"
#include "libguile/variable.h"
#include "libguile/fluids.h"
#include "libguile/modules.h"
SCM scm_module_system_booted_p = 0;
SCM scm_module_tag;
SCM scm_module_type;
static SCM the_root_module;
static SCM root_module_lookup_closure;
SCM
scm_the_root_module ()
{
return SCM_CDR (the_root_module);
}
static SCM the_module;
SCM_DEFINE (scm_current_module, "current-module", 0, 0, 0,
(),
"Return the current module.")
#define FUNC_NAME s_scm_current_module
{
return scm_fluid_ref (the_module);
}
#undef FUNC_NAME
#define SCM_VALIDATE_STRUCT_TYPE(pos, v, type) \
do { \
SCM_ASSERT (SCM_NIMP (v) && SCM_NFALSEP (SCM_STRUCTP (v)) \
&& SCM_STRUCT_VTABLE (v) == (type), \
v, pos, FUNC_NAME); \
} while (0)
SCM_DEFINE (scm_set_current_module, "set-current-module", 1, 0, 0,
(SCM module),
"Set the current module to @var{module} and return"
"the previous current module.")
#define FUNC_NAME s_scm_set_current_module
{
SCM old;
/* XXX - we can not validate our argument when the module system
hasn't been booted yet since we don't know the type. This
should be fixed when we have a cleaner way of booting
Guile.
*/
if (scm_module_system_booted_p)
SCM_VALIDATE_STRUCT_TYPE (SCM_ARG1, module, scm_module_type);
old = scm_current_module ();
scm_fluid_set_x (the_module, module);
#if SCM_DEBUG_DEPRECATED == 0
scm_fluid_set_x (SCM_CDR (scm_top_level_lookup_closure_var),
scm_current_module_lookup_closure ());
scm_fluid_set_x (SCM_CDR (scm_system_transformer),
scm_current_module_transformer ());
#endif
return old;
}
#undef FUNC_NAME
SCM_DEFINE (scm_interaction_environment, "interaction-environment", 0, 0, 0,
(),
"Return a specifier for the environment that contains\n"
"implementation--defined bindings, typically a superset of those\n"
"listed in the report. The intent is that this procedure will\n"
"return the environment in which the implementation would\n"
"evaluate expressions dynamically typed by the user.")
#define FUNC_NAME s_scm_interaction_environment
{
return scm_current_module ();
}
#undef FUNC_NAME
SCM_SYMBOL (scm_sym_app, "app");
SCM_SYMBOL (scm_sym_modules, "modules");
static SCM module_prefix;
static SCM
scm_module_full_name (SCM name)
{
if (SCM_EQ_P (SCM_CAR (name), scm_sym_app))
return name;
else
return scm_append (SCM_LIST2 (module_prefix, name));
}
static SCM make_modules_in;
static SCM beautify_user_module_x;
SCM
scm_make_module (SCM name)
{
return scm_apply (SCM_CDR (make_modules_in),
SCM_LIST2 (scm_the_root_module (),
scm_module_full_name (name)),
SCM_EOL);
}
SCM
scm_ensure_user_module (SCM module)
{
scm_apply (SCM_CDR (beautify_user_module_x), SCM_LIST1 (module), SCM_EOL);
return SCM_UNSPECIFIED;
}
SCM
scm_module_lookup_closure (SCM module)
{
return SCM_MODULE_EVAL_CLOSURE (module);
}
SCM
scm_current_module_lookup_closure ()
{
if (scm_module_system_booted_p)
return scm_module_lookup_closure (scm_current_module ());
else
return SCM_BOOL_F;
}
SCM
scm_module_transformer (SCM module)
{
return SCM_MODULE_TRANSFORMER (module);
}
SCM
scm_current_module_transformer ()
{
if (scm_module_system_booted_p)
return scm_module_transformer (scm_current_module ());
else
return SCM_BOOL_F;
}
static SCM resolve_module;
SCM
scm_resolve_module (SCM name)
{
return scm_apply (SCM_CDR (resolve_module), SCM_LIST1 (name), SCM_EOL);
}
static SCM try_module_autoload;
SCM
scm_load_scheme_module (SCM name)
{
return scm_apply (SCM_CDR (try_module_autoload), SCM_LIST1 (name), SCM_EOL);
}
/* Environments */
SCM
scm_top_level_env (SCM thunk)
{
if (SCM_IMP (thunk))
return SCM_EOL;
else
return scm_cons (thunk, SCM_EOL);
}
SCM
scm_env_top_level (SCM env)
{
while (SCM_NIMP (env))
{
if (!SCM_CONSP (SCM_CAR (env))
&& SCM_NFALSEP (scm_procedure_p (SCM_CAR (env))))
return SCM_CAR (env);
env = SCM_CDR (env);
}
return SCM_BOOL_F;
}
SCM_SYMBOL (scm_sym_system_module, "system-module");
SCM
scm_system_module_env_p (SCM env)
{
SCM proc = scm_env_top_level (env);
if (SCM_FALSEP (proc))
proc = root_module_lookup_closure;
return ((SCM_NFALSEP (scm_procedure_property (proc,
scm_sym_system_module)))
? SCM_BOOL_T
: SCM_BOOL_F);
}
/*
* C level implementation of the standard eval closure
*
* This increases loading speed substantially.
* The code will be replaced by the low-level environments in next release.
*/
static SCM module_make_local_var_x;
static SCM
module_variable (SCM module, SCM sym)
{
/* 1. Check module obarray */
SCM b = scm_hashq_ref (SCM_MODULE_OBARRAY (module), sym, SCM_UNDEFINED);
if (SCM_VARIABLEP (b))
return b;
{
SCM binder = SCM_MODULE_BINDER (module);
if (SCM_NFALSEP (binder))
/* 2. Custom binder */
{
b = scm_apply (binder,
SCM_LIST3 (module, sym, SCM_BOOL_F),
SCM_EOL);
if (SCM_NFALSEP (b))
return b;
}
}
{
/* 3. Search the use list */
SCM uses = SCM_MODULE_USES (module);
while (SCM_CONSP (uses))
{
b = module_variable (SCM_CAR (uses), sym);
if (SCM_NFALSEP (b))
return b;
uses = SCM_CDR (uses);
}
return SCM_BOOL_F;
}
}
scm_bits_t scm_tc16_eval_closure;
/* NOTE: This function may be called by a smob application
or from another C function directly. */
SCM
scm_eval_closure_lookup (SCM eclo, SCM sym, SCM definep)
{
SCM module = SCM_PACK (SCM_SMOB_DATA (eclo));
if (SCM_NFALSEP (definep))
return scm_apply (SCM_CDR (module_make_local_var_x),
SCM_LIST2 (module, sym),
SCM_EOL);
else
return module_variable (module, sym);
}
SCM_DEFINE (scm_standard_eval_closure, "standard-eval-closure", 1, 0, 0,
(SCM module),
"Return an eval closure for the module @var{module}.")
#define FUNC_NAME s_scm_standard_eval_closure
{
SCM_RETURN_NEWSMOB (scm_tc16_eval_closure, SCM_UNPACK (module));
}
#undef FUNC_NAME
void
scm_init_modules ()
{
#ifndef SCM_MAGIC_SNARFER
#include "libguile/modules.x"
#endif
module_make_local_var_x = scm_sysintern ("module-make-local-var!",
SCM_UNDEFINED);
scm_tc16_eval_closure = scm_make_smob_type ("eval-closure", 0);
scm_set_smob_mark (scm_tc16_eval_closure, scm_markcdr);
scm_set_smob_apply (scm_tc16_eval_closure, scm_eval_closure_lookup, 2, 0, 0);
the_module = scm_permanent_object (scm_make_fluid ());
}
void
scm_post_boot_init_modules ()
{
scm_module_type =
scm_permanent_object (SCM_CDR (scm_intern0 ("module-type")));
scm_module_tag = (SCM_CELL_WORD_1 (scm_module_type) + scm_tc3_cons_gloc);
module_prefix = scm_permanent_object (SCM_LIST2 (scm_sym_app,
scm_sym_modules));
make_modules_in = scm_intern0 ("make-modules-in");
beautify_user_module_x = scm_intern0 ("beautify-user-module!");
the_root_module = scm_intern0 ("the-root-module");
root_module_lookup_closure = scm_permanent_object
(scm_module_lookup_closure (SCM_CDR (the_root_module)));
resolve_module = scm_intern0 ("resolve-module");
try_module_autoload = scm_intern0 ("try-module-autoload");
scm_module_system_booted_p = 1;
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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