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126 lines
4.1 KiB
C
126 lines
4.1 KiB
C
/* Copyright (C) 1998 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 "evalext.h"
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SCM_PROC (s_definedp, "defined?", 1, 0, 0, scm_definedp);
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SCM
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scm_definedp (sym)
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SCM sym;
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{
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SCM vcell;
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if (SCM_ISYMP (sym))
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return SCM_BOOL_T;
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SCM_ASSERT (SCM_NIMP (sym) && SCM_SYMBOLP (sym), sym, SCM_ARG1, s_definedp);
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vcell = scm_sym2vcell(sym,
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SCM_CDR (scm_top_level_lookup_closure_var),
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SCM_BOOL_F);
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return (vcell == SCM_BOOL_F || SCM_UNBNDP(SCM_CDR(vcell))) ?
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SCM_BOOL_F : SCM_BOOL_T;
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}
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static char s_undefine[] = "undefine";
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SCM
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scm_m_undefine (x, env)
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SCM x, env;
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{
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SCM arg1 = x;
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x = SCM_CDR (x);
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SCM_ASSYNT (SCM_TOP_LEVEL (env), arg1, "bad placement ", s_undefine);
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SCM_ASSYNT (SCM_NIMP (x) && SCM_CONSP (x) && SCM_CDR (x) == SCM_EOL,
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arg1, scm_s_expression, s_undefine);
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x = SCM_CAR (x);
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SCM_ASSYNT (SCM_NIMP (x) && SCM_SYMBOLP (x), arg1, scm_s_variable, s_undefine);
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arg1 = scm_sym2vcell (x, scm_env_top_level (env), SCM_BOOL_F);
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SCM_ASSYNT (SCM_NFALSEP (arg1) && !SCM_UNBNDP (SCM_CDR (arg1)),
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x, "variable already unbound ", s_undefine);
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#if 0
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#ifndef SCM_RECKLESS
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if (SCM_NIMP (SCM_CDR (arg1)) && ((SCM) SCM_SNAME (SCM_CDR (arg1)) == x))
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scm_warn ("undefining built-in ", SCM_CHARS (x));
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else
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#endif
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if (5 <= scm_verbose && SCM_UNDEFINED != SCM_CDR (arg1))
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scm_warn ("redefining ", SCM_CHARS (x));
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#endif
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SCM_SETCDR (arg1, SCM_UNDEFINED);
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#ifdef SICP
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return SCM_CAR (arg1);
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#else
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return SCM_UNSPECIFIED;
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#endif
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}
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static char s_sequence_to_list[] = "sequence->list";
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SCM
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scm_m_sequence_to_list (SCM xorig, SCM env)
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{
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SCM x = xorig;
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SCM res = SCM_EOL;
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while (SCM_NNULLP (x = SCM_CDR (x)))
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{
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SCM_ASSYNT (SCM_NIMP (x) && SCM_ECONSP (x),
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xorig, scm_s_expression, s_sequence_to_list);
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res = scm_cons (SCM_XEVALCAR (x, env), res);
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}
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return res;
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}
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SCM_PROC (s_serial_map, "serial-map", 2, 0, 1, scm_map);
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void
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scm_init_evalext ()
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{
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scm_make_synt (s_undefine, scm_makacro, scm_m_undefine);
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scm_make_synt (s_sequence_to_list, scm_makacro, scm_m_sequence_to_list);
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#include "evalext.x"
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}
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