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-rw-r--r-- | libguile/evalext.c | 124 | ||||
-rw-r--r-- | libguile/evalext.h | 56 |
2 files changed, 180 insertions, 0 deletions
diff --git a/libguile/evalext.c b/libguile/evalext.c new file mode 100644 index 000000000..622837280 --- /dev/null +++ b/libguile/evalext.c @@ -0,0 +1,124 @@ +/* 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 "_scm.h" +#include "eval.h" +#include "macros.h" + +#include "evalext.h" + +SCM_PROC (s_definedp, "defined?", 1, 0, 0, scm_definedp); + +SCM +scm_definedp (sym) + SCM sym; +{ + SCM vcell; + + if (SCM_ISYMP (sym)) + return SCM_BOOL_T; + + SCM_ASSERT (SCM_NIMP (sym) && SCM_SYMBOLP (sym), sym, SCM_ARG1, s_definedp); + + vcell = scm_sym2vcell(sym, + SCM_CDR (scm_top_level_lookup_closure_var), + SCM_BOOL_F); + return (vcell == SCM_BOOL_F || SCM_UNBNDP(SCM_CDR(vcell))) ? + SCM_BOOL_F : SCM_BOOL_T; +} + +static char s_undefine[] = "undefine"; + +SCM +scm_m_undefine (x, env) + SCM x, env; +{ + SCM arg1 = x; + x = SCM_CDR (x); + SCM_ASSYNT (SCM_TOP_LEVEL (env), arg1, "bad placement ", s_undefine); + SCM_ASSYNT (SCM_NIMP (x) && SCM_CONSP (x) && SCM_CDR (x) == SCM_EOL, + arg1, scm_s_expression, s_undefine); + x = SCM_CAR (x); + SCM_ASSYNT (SCM_NIMP (x) && SCM_SYMBOLP (x), arg1, scm_s_variable, s_undefine); + arg1 = scm_sym2vcell (x, scm_env_top_level (env), SCM_BOOL_F); + SCM_ASSYNT (SCM_NFALSEP (arg1) && !SCM_UNBNDP (SCM_CDR (arg1)), + x, "variable already unbound ", s_undefine); +#if 0 +#ifndef SCM_RECKLESS + if (SCM_NIMP (SCM_CDR (arg1)) && ((SCM) SCM_SNAME (SCM_CDR (arg1)) == x)) + scm_warn ("undefining built-in ", SCM_CHARS (x)); + else +#endif + if (5 <= scm_verbose && SCM_UNDEFINED != SCM_CDR (arg1)) + scm_warn ("redefining ", SCM_CHARS (x)); +#endif + SCM_SETCDR (arg1, SCM_UNDEFINED); +#ifdef SICP + return SCM_CAR (arg1); +#else + return SCM_UNSPECIFIED; +#endif +} + +static char s_sequence_to_list[] = "sequence->list"; + +SCM +scm_m_sequence_to_list (SCM x, SCM env) +{ + SCM res = SCM_EOL; + SCM_ASSYNT (SCM_NULLP (SCM_CDR (x)) + || (SCM_NIMP (SCM_CDR (x) && SCM_ECONSP (SCM_CDR (x)))), + x, scm_s_expression, s_sequence_to_list); + while (SCM_NNULLP (x = SCM_CDR (x))) + res = scm_cons (SCM_XEVALCAR (x, env), res); + return res; +} + +SCM_PROC (s_serial_map, "serial-map", 2, 0, 1, scm_map); + +void +scm_init_evalext () +{ + scm_make_synt (s_undefine, scm_makacro, scm_m_undefine); + scm_make_synt (s_sequence_to_list, scm_makacro, scm_m_sequence_to_list); +#include "evalext.x" +} diff --git a/libguile/evalext.h b/libguile/evalext.h new file mode 100644 index 000000000..f58a96ea2 --- /dev/null +++ b/libguile/evalext.h @@ -0,0 +1,56 @@ +/* classes: h_files */ + +#ifndef EVALEXTH +#define EVALEXTH +/* 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_definedp SCM_P ((SCM sym)); +extern SCM scm_m_undefine SCM_P ((SCM x, SCM env)); +extern SCM scm_m_sequence_to_list SCM_P ((SCM x, SCM env)); +extern void scm_init_evalext SCM_P ((void)); + +#endif /* EVALEXTH */ |