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/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001 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 <string.h>
#include "libguile/_scm.h"
#include "libguile/ports.h"
#include "libguile/root.h"
#include "libguile/smob.h"
#include "libguile/hashtab.h"
#include "libguile/validate.h"
#include "libguile/keywords.h"
scm_t_bits scm_tc16_keyword;
static int
keyword_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED)
{
SCM symbol = SCM_KEYWORDSYM (exp);
scm_puts ("#:", port);
scm_print_symbol_name (SCM_SYMBOL_CHARS (symbol) + 1,
SCM_SYMBOL_LENGTH (symbol) - 1,
port);
scm_remember_upto_here_1 (symbol);
return 1;
}
SCM_DEFINE (scm_make_keyword_from_dash_symbol, "make-keyword-from-dash-symbol", 1, 0, 0,
(SCM symbol),
"Make a keyword object from a @var{symbol} that starts with a dash.")
#define FUNC_NAME s_scm_make_keyword_from_dash_symbol
{
SCM keyword;
SCM_ASSERT (SCM_SYMBOLP (symbol)
&& ('-' == SCM_SYMBOL_CHARS(symbol)[0]),
symbol, SCM_ARG1, FUNC_NAME);
SCM_DEFER_INTS;
keyword = scm_hashq_ref (scm_keyword_obarray, symbol, SCM_BOOL_F);
if (SCM_FALSEP (keyword))
{
SCM_NEWSMOB (keyword, scm_tc16_keyword, SCM_UNPACK (symbol));
scm_hashq_set_x (scm_keyword_obarray, symbol, keyword);
}
SCM_ALLOW_INTS;
return keyword;
}
#undef FUNC_NAME
SCM
scm_c_make_keyword (char *s)
{
char *buf = scm_malloc (strlen (s) + 2);
SCM symbol;
buf[0] = '-';
strcpy (buf + 1, s);
symbol = scm_str2symbol (buf);
free (buf);
return scm_make_keyword_from_dash_symbol (symbol);
}
SCM_DEFINE (scm_keyword_p, "keyword?", 1, 0, 0,
(SCM obj),
"Return @code{#t} if the argument @var{obj} is a keyword, else\n"
"@code{#f}.")
#define FUNC_NAME s_scm_keyword_p
{
return SCM_BOOL (SCM_KEYWORDP (obj));
}
#undef FUNC_NAME
SCM_DEFINE (scm_keyword_dash_symbol, "keyword-dash-symbol", 1, 0, 0,
(SCM keyword),
"Return the dash symbol for @var{keyword}.\n"
"This is the inverse of @code{make-keyword-from-dash-symbol}.")
#define FUNC_NAME s_scm_keyword_dash_symbol
{
SCM_VALIDATE_KEYWORD (1, keyword);
return SCM_KEYWORDSYM (keyword);
}
#undef FUNC_NAME
void
scm_init_keywords ()
{
scm_tc16_keyword = scm_make_smob_type ("keyword", 0);
scm_set_smob_mark (scm_tc16_keyword, scm_markcdr);
scm_set_smob_print (scm_tc16_keyword, keyword_print);
scm_keyword_obarray = scm_c_make_hash_table (256);
#ifndef SCM_MAGIC_SNARFER
#include "libguile/keywords.x"
#endif
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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