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/* Copyright (C) 1998,1999,2000,2001,2002,2003, 2006, 2008, 2009 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "libguile/_scm.h"
#include "libguile/eval.h"
#include "libguile/fluids.h"
#include "libguile/modules.h"
#include "libguile/validate.h"
#include "libguile/evalext.h"
SCM_DEFINE (scm_defined_p, "defined?", 1, 1, 0,
(SCM sym, SCM env),
"Return @code{#t} if @var{sym} is defined in the lexical "
"environment @var{env}. When @var{env} is not specified, "
"look in the top-level environment as defined by the "
"current module.")
#define FUNC_NAME s_scm_defined_p
{
SCM var;
SCM_VALIDATE_SYMBOL (1, sym);
if (SCM_UNBNDP (env))
var = scm_sym2var (sym, scm_current_module_lookup_closure (),
SCM_BOOL_F);
else
{
SCM frames = env;
register SCM b;
for (; SCM_NIMP (frames); frames = SCM_CDR (frames))
{
SCM_ASSERT (scm_is_pair (frames), env, SCM_ARG2, FUNC_NAME);
b = SCM_CAR (frames);
if (scm_is_true (scm_procedure_p (b)))
break;
SCM_ASSERT (scm_is_pair (b), env, SCM_ARG2, FUNC_NAME);
for (b = SCM_CAR (b); SCM_NIMP (b); b = SCM_CDR (b))
{
if (!scm_is_pair (b))
{
if (scm_is_eq (b, sym))
return SCM_BOOL_T;
else
break;
}
if (scm_is_eq (SCM_CAR (b), sym))
return SCM_BOOL_T;
}
}
var = scm_sym2var (sym,
SCM_NIMP (frames) ? SCM_CAR (frames) : SCM_BOOL_F,
SCM_BOOL_F);
}
return (scm_is_false (var) || SCM_UNBNDP (SCM_VARIABLE_REF (var))
? SCM_BOOL_F
: SCM_BOOL_T);
}
#undef FUNC_NAME
SCM_REGISTER_PROC (s_map_in_order, "map-in-order", 2, 0, 1, scm_map);
SCM_DEFINE (scm_self_evaluating_p, "self-evaluating?", 1, 0, 0,
(SCM obj),
"Return #t for objects which Guile considers self-evaluating")
#define FUNC_NAME s_scm_self_evaluating_p
{
switch (SCM_ITAG3 (obj))
{
case scm_tc3_int_1:
case scm_tc3_int_2:
/* inum */
return SCM_BOOL_T;
case scm_tc3_imm24:
/* characters, booleans, other immediates */
return scm_from_bool (!scm_is_null (obj));
case scm_tc3_cons:
switch (SCM_TYP7 (obj))
{
case scm_tcs_closures:
case scm_tc7_vector:
case scm_tc7_wvect:
case scm_tc7_number:
case scm_tc7_string:
case scm_tc7_smob:
case scm_tc7_pws:
case scm_tcs_subrs:
case scm_tcs_struct:
return SCM_BOOL_T;
default:
return SCM_BOOL_F;
}
}
SCM_MISC_ERROR ("Internal error: Object ~S has unknown type",
scm_list_1 (obj));
return SCM_UNSPECIFIED; /* never reached */
}
#undef FUNC_NAME
void
scm_init_evalext ()
{
#include "libguile/evalext.x"
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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