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791eb0c01a
As the FSF advises, 'There is no legal significance to using the three-character sequence “(C)”, but it does no harm.' It does take up space though! For that reason, we remove it here from our C files.
146 lines
3.9 KiB
C
146 lines
3.9 KiB
C
/* Copyright 1995-1998,2000-2001,2006,2008,2011,2018
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* 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 License
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* as published by the Free Software Foundation; either version 3 of
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* 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, but
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* 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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "boolean.h"
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#include "deprecation.h"
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#include "eq.h"
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#include "gsubr.h"
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#include "list.h"
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#include "ports.h"
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#include "smob.h"
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#include "variable.h"
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void
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scm_i_variable_print (SCM exp, SCM port, scm_print_state *pstate)
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{
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scm_puts ("#<variable ", port);
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scm_uintprint (SCM_UNPACK (exp), 16, port);
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scm_puts (" value: ", port);
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scm_iprin1 (SCM_VARIABLE_REF (exp), port, pstate);
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scm_putc ('>', port);
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}
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static SCM
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make_variable (SCM init)
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{
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return scm_cell (scm_tc7_variable, SCM_UNPACK (init));
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}
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SCM_DEFINE (scm_make_variable, "make-variable", 1, 0, 0,
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(SCM init),
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"Return a variable initialized to value @var{init}.")
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#define FUNC_NAME s_scm_make_variable
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{
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return make_variable (init);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_make_undefined_variable, "make-undefined-variable", 0, 0, 0,
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(),
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"Return a variable that is initially unbound.")
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#define FUNC_NAME s_scm_make_undefined_variable
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{
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return make_variable (SCM_UNDEFINED);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_variable_p, "variable?", 1, 0, 0,
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(SCM obj),
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"Return @code{#t} iff @var{obj} is a variable object, else\n"
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"return @code{#f}.")
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#define FUNC_NAME s_scm_variable_p
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{
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return scm_from_bool (SCM_VARIABLEP (obj));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_variable_ref, "variable-ref", 1, 0, 0,
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(SCM var),
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"Dereference @var{var} and return its value.\n"
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"@var{var} must be a variable object; see @code{make-variable}\n"
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"and @code{make-undefined-variable}.")
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#define FUNC_NAME s_scm_variable_ref
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{
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SCM val;
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SCM_VALIDATE_VARIABLE (1, var);
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val = SCM_VARIABLE_REF (var);
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if (scm_is_eq (val, SCM_UNDEFINED))
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SCM_MISC_ERROR ("variable is unbound: ~S", scm_list_1 (var));
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return val;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_variable_set_x, "variable-set!", 2, 0, 0,
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(SCM var, SCM val),
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"Set the value of the variable @var{var} to @var{val}.\n"
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"@var{var} must be a variable object, @var{val} can be any\n"
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"value. Return an unspecified value.")
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#define FUNC_NAME s_scm_variable_set_x
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{
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SCM_VALIDATE_VARIABLE (1, var);
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SCM_VARIABLE_SET (var, val);
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return SCM_UNSPECIFIED;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_variable_unset_x, "variable-unset!", 1, 0, 0,
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(SCM var),
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"Ensure that @var{var} is not bound to a value.\n"
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"@var{var} must be a variable object.")
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#define FUNC_NAME s_scm_variable_unset_x
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{
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SCM_VALIDATE_VARIABLE (1, var);
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SCM_VARIABLE_SET (var, SCM_UNDEFINED);
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return SCM_UNSPECIFIED;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_variable_bound_p, "variable-bound?", 1, 0, 0,
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(SCM var),
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"Return @code{#t} iff @var{var} is bound to a value.\n"
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"Throws an error if @var{var} is not a variable object.")
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#define FUNC_NAME s_scm_variable_bound_p
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{
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SCM_VALIDATE_VARIABLE (1, var);
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return scm_from_bool (!scm_is_eq (SCM_VARIABLE_REF (var), SCM_UNDEFINED));
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}
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#undef FUNC_NAME
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void
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scm_init_variable ()
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{
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#include "variable.x"
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}
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