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140 lines
3.7 KiB
C
140 lines
3.7 KiB
C
/* Copyright (C) 1999 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice. */
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#include "_scm.h"
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#include "eval.h"
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#include "macros.h"
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#include "lang.h"
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/* {Multi-language support}
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*/
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/* Representation of pairs:
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*
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* Since we're going to share data with Scheme, we use EOL instead of nil
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* in all data structures.
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*/
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SCM_PROC (s_nil_cons, "nil-cons", 2, 0, 0, scm_nil_cons);
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SCM
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scm_nil_cons (SCM x, SCM y)
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{
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register SCM z;
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SCM_NEWCELL (z);
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SCM_SETCAR (z, x);
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SCM_SETCDR (z, SCM_NIL2EOL (y, y));
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return z;
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}
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SCM_PROC (s_nil_car, "nil-car", 1, 0, 0, scm_nil_car);
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SCM
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scm_nil_car (SCM x)
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{
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if (SCM_NILP (x))
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return scm_nil;
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SCM_ASSERT (SCM_NIMP (x) && SCM_CONSP (x), x, SCM_ARG1, s_nil_car);
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return SCM_CAR (x);
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}
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SCM_PROC (s_nil_cdr, "nil-cdr", 1, 0, 0, scm_nil_cdr);
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SCM
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scm_nil_cdr (SCM x)
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{
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if (SCM_NILP (x))
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return scm_nil;
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SCM_ASSERT (SCM_NIMP (x) && SCM_CONSP (x), x, SCM_ARG1, s_nil_cdr);
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return SCM_EOL2NIL (SCM_CDR (x), x);
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}
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SCM_PROC (s_null, "null", 1, 0, 0, scm_null);
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SCM
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scm_null (SCM x)
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{
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return (SCM_NILP (x) || SCM_NULLP (x) || SCM_FALSEP (x)) ? scm_t : scm_nil;
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}
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SCM
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scm_m_while (SCM exp, SCM env)
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{
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register SCM x = exp = SCM_CDR (exp);
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SCM z = scm_eval_car (x, env);
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while (!SCM_NILP (z) && SCM_NFALSEP (z))
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{
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while (SCM_NNULLP (x = SCM_CDR (x)))
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{
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if (SCM_NIMP (SCM_CAR (x)))
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(*scm_ceval_ptr) (SCM_CAR (x), env);
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}
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z = scm_eval_car (x = exp, env);
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}
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return scm_nil;
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}
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SCM_PROC1 (s_nil_eq, "nil-eq", scm_tc7_rpsubr, scm_nil_eq);
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SCM
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scm_nil_eq (SCM x, SCM y)
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{
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return (((x==y)
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|| (SCM_NILP (x) && (SCM_NULLP (y) || SCM_FALSEP (y)))
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|| (SCM_NILP (y) && (SCM_NULLP (x) || SCM_FALSEP (x))))
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? scm_t
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: scm_nil);
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}
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void
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scm_init_lang ()
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{
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#include "lang.x"
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scm_make_synt ("nil-while", scm_makacro, scm_m_while);
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}
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