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125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2003 Free Software Foundation, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <string.h>
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#include "libguile/_scm.h"
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#include "libguile/ports.h"
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#include "libguile/root.h"
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#include "libguile/smob.h"
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#include "libguile/hashtab.h"
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#include "libguile/validate.h"
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#include "libguile/keywords.h"
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scm_t_bits scm_tc16_keyword;
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static int
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keyword_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED)
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{
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SCM symbol = SCM_KEYWORDSYM (exp);
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scm_puts ("#:", port);
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scm_print_symbol_name (SCM_SYMBOL_CHARS (symbol) + 1,
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SCM_SYMBOL_LENGTH (symbol) - 1,
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port);
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scm_remember_upto_here_1 (symbol);
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return 1;
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}
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SCM_DEFINE (scm_make_keyword_from_dash_symbol, "make-keyword-from-dash-symbol", 1, 0, 0,
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(SCM symbol),
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"Make a keyword object from a @var{symbol} that starts with a dash.")
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#define FUNC_NAME s_scm_make_keyword_from_dash_symbol
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{
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SCM keyword;
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SCM_ASSERT (SCM_SYMBOLP (symbol)
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&& ('-' == SCM_SYMBOL_CHARS(symbol)[0]),
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symbol, SCM_ARG1, FUNC_NAME);
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SCM_DEFER_INTS;
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keyword = scm_hashq_ref (scm_keyword_obarray, symbol, SCM_BOOL_F);
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if (SCM_FALSEP (keyword))
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{
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SCM_NEWSMOB (keyword, scm_tc16_keyword, SCM_UNPACK (symbol));
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scm_hashq_set_x (scm_keyword_obarray, symbol, keyword);
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}
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SCM_ALLOW_INTS;
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return keyword;
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}
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#undef FUNC_NAME
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SCM
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scm_c_make_keyword (char *s)
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{
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char *buf = scm_malloc (strlen (s) + 2);
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SCM symbol;
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buf[0] = '-';
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strcpy (buf + 1, s);
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symbol = scm_str2symbol (buf);
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free (buf);
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return scm_make_keyword_from_dash_symbol (symbol);
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}
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SCM_DEFINE (scm_keyword_p, "keyword?", 1, 0, 0,
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(SCM obj),
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"Return @code{#t} if the argument @var{obj} is a keyword, else\n"
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"@code{#f}.")
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#define FUNC_NAME s_scm_keyword_p
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{
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return SCM_BOOL (SCM_KEYWORDP (obj));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_keyword_dash_symbol, "keyword-dash-symbol", 1, 0, 0,
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(SCM keyword),
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"Return the dash symbol for @var{keyword}.\n"
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"This is the inverse of @code{make-keyword-from-dash-symbol}.")
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#define FUNC_NAME s_scm_keyword_dash_symbol
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{
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SCM_VALIDATE_KEYWORD (1, keyword);
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return SCM_KEYWORDSYM (keyword);
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}
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#undef FUNC_NAME
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void
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scm_init_keywords ()
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{
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scm_tc16_keyword = scm_make_smob_type ("keyword", 0);
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scm_set_smob_mark (scm_tc16_keyword, scm_markcdr);
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scm_set_smob_print (scm_tc16_keyword, keyword_print);
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scm_keyword_obarray = scm_c_make_hash_table (0);
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#include "libguile/keywords.x"
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}
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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