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/* Copyright 1995-1996,2000-2001,2006,2008-2011,2018,2019
Free Software Foundation, Inc.
This file is part of Guile.
Guile 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 3 of the License, or
(at your option) any later version.
Guile 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 Guile. If not, see
<https://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "error.h"
#include "gsubr.h"
#include "verify.h"
#include "boolean.h"
/*
* These compile-time tests verify the properties needed for the
* efficient test macros defined in boolean.h, which are defined in
* terms of the SCM_MATCHES_BITS_IN_COMMON macro.
*
* See the comments preceeding the definitions of SCM_BOOL_F and
* SCM_MATCHES_BITS_IN_COMMON in scm.h for more information.
*/
verify (SCM_BITS_DIFFER_IN_EXACTLY_ONE_BIT_POSITION \
(SCM_BOOL_F_BITS, SCM_BOOL_T_BITS));
verify (SCM_BITS_DIFFER_IN_EXACTLY_ONE_BIT_POSITION \
(SCM_ELISP_NIL_BITS, SCM_BOOL_F_BITS));
verify (SCM_BITS_DIFFER_IN_EXACTLY_ONE_BIT_POSITION \
(SCM_ELISP_NIL_BITS, SCM_EOL_BITS));
verify (SCM_BITS_DIFFER_IN_EXACTLY_TWO_BIT_POSITIONS \
(SCM_ELISP_NIL_BITS, SCM_BOOL_F_BITS, SCM_BOOL_T_BITS, \
SCM_XXX_ANOTHER_BOOLEAN_DONT_USE_0));
verify (SCM_BITS_DIFFER_IN_EXACTLY_TWO_BIT_POSITIONS \
(SCM_ELISP_NIL_BITS, SCM_BOOL_F_BITS, SCM_EOL_BITS, \
SCM_XXX_ANOTHER_LISP_FALSE_DONT_USE));
SCM_DEFINE (scm_not, "not", 1, 0, 0,
(SCM x),
"Return @code{#t} iff @var{x} is false, else return @code{#f}.")
#define FUNC_NAME s_scm_not
{
return scm_from_bool (scm_is_false (x));
}
#undef FUNC_NAME
SCM_DEFINE (scm_nil_p, "nil?", 1, 0, 0,
(SCM x),
"Return @code{#t} if @var{x} would be interpreted as @code{nil}\n"
"by Emacs Lisp code, else return @code{#f}.\n"
"\n"
"@example\n"
"(nil? #nil) @result{} #t\n"
"(nil? #f) @result{} #t\n"
"(nil? '()) @result{} #t\n"
"(nil? 3) @result{} #f\n"
"@end example")
#define FUNC_NAME s_scm_nil_p
{
return scm_from_bool (scm_is_lisp_false (x));
}
#undef FUNC_NAME
SCM_DEFINE (scm_boolean_p, "boolean?", 1, 0, 0,
(SCM obj),
"Return @code{#t} iff @var{obj} is @code{#t} or false.")
#define FUNC_NAME s_scm_boolean_p
{
return scm_from_bool (scm_is_bool (obj));
}
#undef FUNC_NAME
int
scm_to_bool (SCM x)
{
if (scm_is_false (x))
return 0;
else if (scm_is_eq (x, SCM_BOOL_T))
return 1;
else
scm_wrong_type_arg (NULL, 0, x);
}
/* We keep this primitive as a function in addition to the same-named macro
because some applications (e.g., GNU LilyPond 2.13.9) expect it to be a
function. */
#undef scm_is_bool
int
scm_is_bool (SCM obj)
{
/* This must match the macro definition of `scm_is_bool ()'. */
return scm_is_bool_or_nil (obj);
}
void
scm_init_boolean ()
{
#include "boolean.x"
}
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