// cppawk: C preprocessor wrapper around awk
// Kaz Kylheku <kaz@kylheku.com>
//
// BSD-2 License
//
// 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.
//
// 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 HOLDER 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.

#ifndef __CPPAWK_CASE_PRIV_H
#define __CPPAWK_CASE_PRIV_H

#ifndef __CPPAWK_NARG_PRIV
#include "narg-priv.h"
#endif

#ifndef __CPPAWK_BASE_H
#include "base.h"
#endif

#if __have_switch

#define __ca_first(x)   case x:
#define __ca_next(p, x) p case x:

#define __mx_first(x)   __of(x)
#define __mx_next(p, x) p case x:

#define __case_temps    __ign
#define __case(expr)    switch (expr)
#define __of(...)       __varexpand(__ca_first, __ca_next, __VA_ARGS__) {{{
#define __matching(...) __varexpand(__ca_first, __ca_next, __VA_ARGS__) {{{
#define __mixed(x, y)   __varexpand(__ca_first, __ca_next, __splice(x))       \
                        __varexpand(__ca_first, __ca_next, __splice(y)) {{{
#define __cbreak        break; }}}
#define __cfall         }}}
#define __cret(val)     return val; }}}
#define __otherwise     default: {{{

#else

#define __clause(expr)  if (__pass || (expr) && (__pass = 1))
#define __of_first(x)   (__val == (x))
#define __of_next(p, x) p || (__val == (x))
#define __mtch_first(x) (__val ~ (x))
#define __mtch_next(p,                                                        \
                    x)  p || (__val ~ (x))

#define __case_temps    __val, __once, __pass
#define __case(expr)    for ((__once = 1) && (__pass = 0) || (__val = expr);  \
                             __once;                                          \
                             __once = 0)
#define __of(...)       __clause(__varexpand(__of_first, __of_next,           \
                                             __VA_ARGS__)) {{{
#define __matching(...) __clause(__varexpand(__mtch_first, mtch_next,         \
                                             __VA_ARGS__)) {{{
#define __mixed(x, y)   __clause(__varexpand(__of_first, __of_next,           \
                                             __splice(x)) ||                  \
                                 __varexpand(__mtch_first, __mtch_next,       \
                                             __splice(y))) {{{
#define __cbreak        break; }}}
#define __creturn(val)  return val; }}}
#define __cfall         }}}
#define __cret(val)     return val; }}}
#define __otherwise     if (__pass = 1) {{{

#endif

#endif