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/* Copyright (C) 1999, 2000, 2001 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. */
#include "libguile/_scm.h"
#include "libguile/eval.h"
#include "libguile/macros.h"
#include "libguile/root.h"
#include "libguile/validate.h"
#include "libguile/lang.h"
/* {Multi-language support}
*/
/* Representation of pairs:
*
* Since we're going to share data with Scheme, we use EOL instead of nil
* in all data structures.
*/
SCM_DEFINE (scm_nil_cons, "nil-cons", 2, 0, 0,
(SCM x, SCM y),
"Create a new cons cell with @var{x} as the car and @var{y} as\n"
"the cdr, but convert @var{y} to Scheme's end-of-list if it is\n"
"a LISP nil.")
#define FUNC_NAME s_scm_nil_cons
{
register SCM z;
SCM_NEWCELL (z);
SCM_SETCAR (z, x);
SCM_SETCDR (z, SCM_NIL2EOL (y, y));
return z;
}
#undef FUNC_NAME
SCM_DEFINE (scm_nil_car, "nil-car", 1, 0, 0,
(SCM x),
"Return the car of @var{x}, but convert it to LISP nil if it\n"
"is Scheme's end-of-list.")
#define FUNC_NAME s_scm_nil_car
{
if (SCM_NILP (x))
return scm_lisp_nil;
SCM_VALIDATE_CONS (1,x);
return SCM_CAR (x);
}
#undef FUNC_NAME
SCM_DEFINE (scm_nil_cdr, "nil-cdr", 1, 0, 0,
(SCM x),
"Return the cdr of @var{x}, but convert it to LISP nil if it\n"
"is Scheme's end-of-list.")
#define FUNC_NAME s_scm_nil_cdr
{
if (SCM_NILP (x))
return scm_lisp_nil;
SCM_VALIDATE_CONS (1,x);
return SCM_EOL2NIL (SCM_CDR (x), x);
}
#undef FUNC_NAME
/* GJB:FIXME:: why does this return scm_lisp_nil instead of SCM_BOOL_F?
Could use SCM_BOOL, below, otherwise */
SCM_DEFINE (scm_null, "null", 1, 0, 0,
(SCM x),
"Return LISP's @code{t} if @var{x} is nil in the LISP sense,\n"
"return LISP's nil otherwise.")
#define FUNC_NAME s_scm_null
{
return (SCM_NILP (x) || SCM_NULLP (x) || SCM_FALSEP (x)) ? scm_lisp_t : scm_lisp_nil;
}
#undef FUNC_NAME
SCM
scm_m_while (SCM exp, SCM env)
{
register SCM x = exp = SCM_CDR (exp);
SCM z = scm_eval_car (x, env);
while (!SCM_NILP (z) && SCM_NFALSEP (z))
{
while (SCM_NNULLP (x = SCM_CDR (x)))
{
if (SCM_NIMP (SCM_CAR (x)))
(*scm_ceval_ptr) (SCM_CAR (x), env);
}
z = scm_eval_car (x = exp, env);
}
return scm_lisp_nil;
}
/* GJB:FIXME:: why does this return scm_lisp_nil instead of SCM_BOOL_F?
Could use SCM_BOOL, below, otherwise */
SCM_DEFINE1 (scm_nil_eq, "nil-eq", scm_tc7_rpsubr,
(SCM x, SCM y),
"Compare @var{x} and @var{y} and return LISP's t if they are\n"
"@code{eq?}, return LISP's nil otherwise.")
#define FUNC_NAME s_scm_nil_eq
{
return ((SCM_EQ_P (x, y)
|| (SCM_NILP (x) && (SCM_NULLP (y) || SCM_FALSEP (y)))
|| (SCM_NILP (y) && (SCM_NULLP (x) || SCM_FALSEP (x))))
? scm_lisp_t
: scm_lisp_nil);
}
#undef FUNC_NAME
void
scm_init_lang ()
{
#include "libguile/lang.x"
scm_make_synt ("nil-while", scm_makacro, scm_m_while);
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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