diff options
-rw-r--r-- | libguile/lang.c | 140 | ||||
-rw-r--r-- | libguile/lang.h | 71 |
2 files changed, 211 insertions, 0 deletions
diff --git a/libguile/lang.c b/libguile/lang.c new file mode 100644 index 000000000..9f7d6fdcc --- /dev/null +++ b/libguile/lang.c @@ -0,0 +1,140 @@ +/* Copyright (C) 1995,1996 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 "_scm.h" + +#include "eval.h" +#include "macros.h" + +#include "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_PROC (s_nil_cons, "nil-cons", 2, 0, 0, scm_nil_cons); + +SCM +scm_nil_cons (SCM x, SCM y) +{ + register SCM z; + SCM_NEWCELL (z); + SCM_SETCAR (z, x); + SCM_SETCDR (z, SCM_NIL2EOL (y, y)); + return z; +} + + +SCM_PROC (s_nil_car, "nil-car", 1, 0, 0, scm_nil_car); + +SCM +scm_nil_car (SCM x) +{ + if (SCM_NILP (x)) + return scm_nil; + SCM_ASSERT (SCM_NIMP (x) && SCM_CONSP (x), x, SCM_ARG1, s_nil_car); + return SCM_CAR (x); +} + +SCM_PROC (s_nil_cdr, "nil-cdr", 1, 0, 0, scm_nil_cdr); + +SCM +scm_nil_cdr (SCM x) +{ + if (SCM_NILP (x)) + return scm_nil; + SCM_ASSERT (SCM_NIMP (x) && SCM_CONSP (x), x, SCM_ARG1, s_nil_cdr); + return SCM_EOL2NIL (SCM_CDR (x), x); +} + +SCM_PROC (s_null, "null", 1, 0, 0, scm_null); + +SCM +scm_null (SCM x) +{ + return (SCM_NILP (x) || SCM_NULLP (x) || SCM_FALSEP (x)) ? scm_t : scm_nil; +} + +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_nil; +} + +SCM_PROC1 (s_nil_eq, "nil-eq", scm_tc7_rpsubr, scm_nil_eq); + +SCM +scm_nil_eq (SCM x, SCM y) +{ + return (((x==y) + || (SCM_NILP (x) && (SCM_NULLP (y) || SCM_FALSEP (y))) + || (SCM_NILP (y) && (SCM_NULLP (x) || SCM_FALSEP (x)))) + ? scm_t + : scm_nil); +} + + + +void +scm_init_lang () +{ +#include "lang.x" + scm_make_synt ("nil-while", scm_makacro, scm_m_while); +} diff --git a/libguile/lang.h b/libguile/lang.h new file mode 100644 index 000000000..83485c247 --- /dev/null +++ b/libguile/lang.h @@ -0,0 +1,71 @@ +/* classes: h_files */ + +#ifndef LANGH +#define LANGH +/* Copyright (C) 1998 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" + + + +extern SCM scm_nil; +extern SCM scm_t; + +#define SCM_NILP(x) ((x) == scm_nil) +#define SCM_NILNULLP(x) (SCM_NILP (x) || SCM_NULLP (x)) +#define SCM_NIL2EOL(x, tmp) ((tmp = (x)) == scm_nil ? SCM_EOL : tmp) +#define SCM_EOL2NIL(x, tmp) (SCM_NULLP (tmp = (x)) ? scm_nil : tmp) +#define SCM_EOL_IFY(x, tmp) (tmp = (x), SCM_NILP (tmp) ? SCM_EOL : tmp) +#define SCM_NIL_IFY(x, tmp) (tmp = (x), SCM_NILP (tmp) ? scm_nil : tmp) + + + +extern SCM scm_nil_cons (SCM x, SCM y); +extern SCM scm_nil_car (SCM x); +extern SCM scm_nil_cdr (SCM x); +extern SCM scm_null (SCM x); +extern SCM scm_m_while (SCM exp, SCM env); +extern SCM scm_nil_eq (SCM x, SCM y); +extern void scm_init_lang SCM_P ((void)); + +#endif /* PAIRSH */ |