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/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2006, 2008, 2011 Free Software Foundation, Inc.
*
* This library 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.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "libguile/_scm.h"
#include "libguile/eq.h"
#include "libguile/ports.h"
#include "libguile/smob.h"
#include "libguile/deprecation.h"
#include "libguile/validate.h"
#include "libguile/variable.h"
void
scm_i_variable_print (SCM exp, SCM port, scm_print_state *pstate)
{
scm_puts ("#<variable ", port);
scm_uintprint (SCM_UNPACK (exp), 16, port);
scm_puts (" value: ", port);
scm_iprin1 (SCM_VARIABLE_REF (exp), port, pstate);
scm_putc ('>', port);
}
static SCM
make_variable (SCM init)
{
return scm_cell (scm_tc7_variable, SCM_UNPACK (init));
}
SCM_DEFINE (scm_make_variable, "make-variable", 1, 0, 0,
(SCM init),
"Return a variable initialized to value @var{init}.")
#define FUNC_NAME s_scm_make_variable
{
return make_variable (init);
}
#undef FUNC_NAME
SCM_DEFINE (scm_make_undefined_variable, "make-undefined-variable", 0, 0, 0,
(),
"Return a variable that is initially unbound.")
#define FUNC_NAME s_scm_make_undefined_variable
{
return make_variable (SCM_UNDEFINED);
}
#undef FUNC_NAME
SCM_DEFINE (scm_variable_p, "variable?", 1, 0, 0,
(SCM obj),
"Return @code{#t} iff @var{obj} is a variable object, else\n"
"return @code{#f}.")
#define FUNC_NAME s_scm_variable_p
{
return scm_from_bool (SCM_VARIABLEP (obj));
}
#undef FUNC_NAME
SCM_DEFINE (scm_variable_ref, "variable-ref", 1, 0, 0,
(SCM var),
"Dereference @var{var} and return its value.\n"
"@var{var} must be a variable object; see @code{make-variable}\n"
"and @code{make-undefined-variable}.")
#define FUNC_NAME s_scm_variable_ref
{
SCM val;
SCM_VALIDATE_VARIABLE (1, var);
val = SCM_VARIABLE_REF (var);
if (scm_is_eq (val, SCM_UNDEFINED))
SCM_MISC_ERROR ("variable is unbound: ~S", scm_list_1 (var));
return val;
}
#undef FUNC_NAME
SCM_DEFINE (scm_variable_set_x, "variable-set!", 2, 0, 0,
(SCM var, SCM val),
"Set the value of the variable @var{var} to @var{val}.\n"
"@var{var} must be a variable object, @var{val} can be any\n"
"value. Return an unspecified value.")
#define FUNC_NAME s_scm_variable_set_x
{
SCM_VALIDATE_VARIABLE (1, var);
SCM_VARIABLE_SET (var, val);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM_DEFINE (scm_variable_unset_x, "variable-unset!", 1, 0, 0,
(SCM var),
"Ensure that @var{var} is not bound to a value.\n"
"@var{var} must be a variable object.")
#define FUNC_NAME s_scm_variable_unset_x
{
SCM_VALIDATE_VARIABLE (1, var);
SCM_VARIABLE_SET (var, SCM_UNDEFINED);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM_DEFINE (scm_variable_bound_p, "variable-bound?", 1, 0, 0,
(SCM var),
"Return @code{#t} iff @var{var} is bound to a value.\n"
"Throws an error if @var{var} is not a variable object.")
#define FUNC_NAME s_scm_variable_bound_p
{
SCM_VALIDATE_VARIABLE (1, var);
return scm_from_bool (!scm_is_eq (SCM_VARIABLE_REF (var), SCM_UNDEFINED));
}
#undef FUNC_NAME
void
scm_init_variable ()
{
#include "libguile/variable.x"
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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