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/*===========================================================================
* Filename : module-srfi8.c
* About : SRFI-8 receive: Binding to multiple values
*
* Copyright (C) 2005 Jun Inoue <jun.lambda AT gmail.com>
* Copyright (C) 2005 Kazuki Ohta <mover AT hct.zaq.ne.jp>
* Copyright (C) 2005-2006 YAMAMOTO Kengo <yamaken AT bp.iij4u.or.jp>
* Copyright (c) 2007-2008 SigScheme Project <uim-en AT googlegroups.com>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of authors nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
* IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
===========================================================================*/
#include <config.h>
#include "sigscheme.h"
#include "sigschemeinternal.h"
/*=======================================
File Local Macro Definitions
=======================================*/
/*=======================================
File Local Type Definitions
=======================================*/
/*=======================================
Variable Definitions
=======================================*/
#include "functable-srfi8.c"
/*=======================================
File Local Function Declarations
=======================================*/
/*=======================================
Function Definitions
=======================================*/
SCM_EXPORT void
scm_initialize_srfi8(void)
{
scm_register_funcs(scm_functable_srfi8);
}
SCM_EXPORT ScmObj
scm_s_srfi8_receive(ScmObj formals, ScmObj expr, ScmObj body,
ScmEvalState *eval_state)
{
scm_int_t formals_len, actuals_len;
ScmObj env, actuals;
DECLARE_FUNCTION("receive", syntax_variadic_tailrec_2);
env = eval_state->env;
/*
* (receive <formals> <expression> <body>)
*/
formals_len = scm_validate_formals(formals);
if (SCM_LISTLEN_ERRORP(formals_len))
ERR_OBJ("bad formals", formals);
/* FIXME: do we have to extend the environment first? The SRFI-8
* document contradicts itself on this part. */
/*
* In my recognition, the description in SRFI-8 "The environment in which
* the receive-expression is evaluated is extended by binding <variable1>,
* ..." does not mean that the environment is extended for the evaluation
* of the receive-expression. Probably it only specifies which environment
* will be extended after the evaluation. So current implementation is
* correct, I think. -- YamaKen 2006-01-05
*/
actuals = EVAL(expr, env);
if (SCM_VALUEPACKETP(actuals)) {
actuals = SCM_VALUEPACKET_VALUES(actuals);
actuals_len = scm_finite_length(actuals);
} else {
actuals = LIST_1(actuals);
actuals_len = 1;
}
if (!scm_valid_environment_extension_lengthp(formals_len, actuals_len))
ERR_OBJ("unmatched number of values for the formals", actuals);
eval_state->env = env = scm_extend_environment(formals, actuals, env);
return scm_s_body(body, eval_state);
}
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