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/* Copyright 1995-2001,2003-2004,2006,2008-2009,2011,2013,2015,2018
Free Software Foundation, Inc.
This file is part of Guile.
Guile is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Guile 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Guile. If not, see
<https://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include <stdarg.h>
#include "async.h"
#include "dynwind.h"
#include "gsubr.h"
#include "hashtab.h"
#include "list.h"
#include "pairs.h"
#include "ports.h"
#include "smob.h"
#include "strings.h"
#include "symbols.h"
#include "keywords.h"
static SCM keyword_obarray;
#define SCM_KEYWORDP(x) (SCM_HAS_TYP7 (x, scm_tc7_keyword))
#define SCM_KEYWORD_SYMBOL(x) (SCM_CELL_OBJECT_1 (x))
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_from_bool (SCM_KEYWORDP (obj));
}
#undef FUNC_NAME
SCM_DEFINE (scm_symbol_to_keyword, "symbol->keyword", 1, 0, 0,
(SCM symbol),
"Return the keyword with the same name as @var{symbol}.")
#define FUNC_NAME s_scm_symbol_to_keyword
{
SCM keyword;
SCM_ASSERT_TYPE (scm_is_symbol (symbol), symbol, 0, NULL, "symbol");
scm_dynwind_begin (0);
scm_i_dynwind_pthread_mutex_lock (&scm_i_misc_mutex);
/* Note: `scm_cell' and `scm_hashq_set_x' can raise an out-of-memory
error. */
keyword = scm_hashq_ref (keyword_obarray, symbol, SCM_BOOL_F);
if (scm_is_false (keyword))
{
keyword = scm_cell (scm_tc7_keyword, SCM_UNPACK (symbol));
scm_hashq_set_x (keyword_obarray, symbol, keyword);
}
scm_dynwind_end ();
return keyword;
}
#undef FUNC_NAME
SCM_DEFINE (scm_keyword_to_symbol, "keyword->symbol", 1, 0, 0,
(SCM keyword),
"Return the symbol with the same name as @var{keyword}.")
#define FUNC_NAME s_scm_keyword_to_symbol
{
SCM_VALIDATE_KEYWORD (1, keyword);
return SCM_KEYWORD_SYMBOL (keyword);
}
#undef FUNC_NAME
int
scm_is_keyword (SCM val)
{
return SCM_KEYWORDP (val);
}
SCM
scm_from_locale_keyword (const char *name)
{
return scm_symbol_to_keyword (scm_from_locale_symbol (name));
}
SCM
scm_from_locale_keywordn (const char *name, size_t len)
{
return scm_symbol_to_keyword (scm_from_locale_symboln (name, len));
}
SCM
scm_from_latin1_keyword (const char *name)
{
return scm_symbol_to_keyword (scm_from_latin1_symbol (name));
}
SCM
scm_from_utf8_keyword (const char *name)
{
return scm_symbol_to_keyword (scm_from_utf8_symbol (name));
}
SCM_SYMBOL (scm_keyword_argument_error, "keyword-argument-error");
void
scm_c_bind_keyword_arguments (const char *subr, SCM rest,
scm_t_keyword_arguments_flags flags, ...)
{
va_list va;
while (scm_is_pair (rest))
{
SCM kw_or_arg = SCM_CAR (rest);
SCM tail = SCM_CDR (rest);
if (scm_is_keyword (kw_or_arg))
{
SCM kw;
SCM *arg_p;
va_start (va, flags);
for (;;)
{
kw = va_arg (va, SCM);
if (SCM_UNBNDP (kw))
{
/* KW_OR_ARG is not in the list of expected keywords. */
if (!(flags & SCM_ALLOW_OTHER_KEYS))
scm_error_scm (scm_keyword_argument_error,
scm_from_locale_string (subr),
scm_from_latin1_string
("Unrecognized keyword"),
SCM_EOL, scm_list_1 (kw_or_arg));
/* Advance REST. Advance past the argument of an
unrecognized keyword, but don't error if such a
keyword has no argument. */
rest = scm_is_pair (tail) ? SCM_CDR (tail) : tail;
break;
}
arg_p = va_arg (va, SCM *);
if (scm_is_eq (kw_or_arg, kw))
{
/* We found the matching keyword. Store the
associated value and break out of the loop. */
if (!scm_is_pair (tail))
scm_error_scm (scm_keyword_argument_error,
scm_from_locale_string (subr),
scm_from_latin1_string
("Keyword argument has no value"),
SCM_EOL, scm_list_1 (kw));
*arg_p = SCM_CAR (tail);
/* Advance REST. */
rest = SCM_CDR (tail);
break;
}
}
va_end (va);
}
else
{
/* The next argument is not a keyword, or is a singleton
keyword at the end of REST. */
if (!(flags & SCM_ALLOW_NON_KEYWORD_ARGUMENTS))
scm_error_scm (scm_keyword_argument_error,
scm_from_locale_string (subr),
scm_from_latin1_string ("Invalid keyword"),
SCM_EOL, scm_list_1 (kw_or_arg));
/* Advance REST. */
rest = tail;
}
}
}
void
scm_init_keywords ()
{
keyword_obarray = scm_c_make_hash_table (0);
#include "keywords.x"
}
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