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/* Copyright 2017-2018,2021
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 "eval.h"
#include "gsubr.h"
#include "keywords.h"
#include "modules.h"
#include "pairs.h"
#include "ports.h"
#include "srcprop.h"
#include "threads.h"
#include "variable.h"
#include "syntax.h"
/* The source field was added to syntax objects in Guile 3.0.6. However
there can be older syntax objects present in compiled files that
don't have the source field. If a syntax object has a source field,
its tag will have HAS_SOURCE_WORD_FLAG set. */
#define HAS_SOURCE_WORD_FLAG 0x100
enum
{
TAG_WORD,
EXPR_WORD,
WRAP_WORD,
MODULE_WORD,
SOURCE_WORD,
WORD_COUNT
};
static int
scm_is_syntax (SCM x)
{
return SCM_HAS_TYP7 (x, scm_tc7_syntax);
}
#define SCM_VALIDATE_SYNTAX(pos, scm) \
SCM_I_MAKE_VALIDATE_MSG2 (pos, scm, scm_is_syntax, "syntax object")
SCM_DEFINE (scm_syntax_p, "syntax?", 1, 0, 0,
(SCM obj),
"Return @code{#t} if the argument @var{obj} is a syntax object,\n"
"else @code{#f}.")
#define FUNC_NAME s_scm_syntax_p
{
return scm_from_bool (scm_is_syntax (obj));
}
#undef FUNC_NAME
SCM_DEFINE (scm_make_syntax, "make-syntax", 3, 1, 0,
(SCM exp, SCM wrap, SCM module, SCM source),
"Make a new syntax object.")
#define FUNC_NAME s_scm_make_syntax
{
if (SCM_UNBNDP (source))
source = scm_source_properties (exp);
if (!scm_is_pair (source))
source = SCM_BOOL_F;
SCM ret = scm_words (scm_tc7_syntax | HAS_SOURCE_WORD_FLAG, WORD_COUNT);
SCM_SET_CELL_OBJECT (ret, EXPR_WORD, exp);
SCM_SET_CELL_OBJECT (ret, WRAP_WORD, wrap);
SCM_SET_CELL_OBJECT (ret, MODULE_WORD, module);
SCM_SET_CELL_OBJECT (ret, SOURCE_WORD, source);
return ret;
}
#undef FUNC_NAME
SCM_DEFINE (scm_syntax_expression, "syntax-expression", 1, 0, 0,
(SCM obj),
"Return the expression contained in the syntax object @var{obj}.")
#define FUNC_NAME s_scm_syntax_expression
{
SCM_VALIDATE_SYNTAX (1, obj);
return SCM_CELL_OBJECT (obj, EXPR_WORD);
}
#undef FUNC_NAME
SCM_DEFINE (scm_syntax_wrap, "syntax-wrap", 1, 0, 0,
(SCM obj),
"Return the wrap contained in the syntax object @var{obj}.")
#define FUNC_NAME s_scm_syntax_wrap
{
SCM_VALIDATE_SYNTAX (1, obj);
return SCM_CELL_OBJECT (obj, WRAP_WORD);
}
#undef FUNC_NAME
SCM_DEFINE (scm_syntax_module, "syntax-module", 1, 0, 0,
(SCM obj),
"Return the module info contained in the syntax object @var{obj}.")
#define FUNC_NAME s_scm_syntax_module
{
SCM_VALIDATE_SYNTAX (1, obj);
return SCM_CELL_OBJECT (obj, MODULE_WORD);
}
#undef FUNC_NAME
SCM_DEFINE (scm_syntax_source, "syntax-source", 1, 0, 0,
(SCM obj),
"Return the source location information for syntax object @var{obj}.")
#define FUNC_NAME s_scm_syntax_source
{
SCM_VALIDATE_SYNTAX (1, obj);
if (!(SCM_CELL_WORD (obj, TAG_WORD) & HAS_SOURCE_WORD_FLAG))
return SCM_BOOL_F;
return SCM_CELL_OBJECT (obj, SOURCE_WORD);
}
#undef FUNC_NAME
static SCM print_syntax_var;
static void
init_print_syntax_var (void)
{
print_syntax_var =
scm_c_private_variable ("system syntax", "print-syntax");
}
void
scm_i_syntax_print (SCM obj, SCM port, scm_print_state *pstate)
{
static scm_i_pthread_once_t once = SCM_I_PTHREAD_ONCE_INIT;
scm_i_pthread_once (&once, init_print_syntax_var);
scm_call_2 (scm_variable_ref (print_syntax_var), obj, port);
}
void
scm_init_syntax ()
{
#include "syntax.x"
}
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