// cppawk: C preprocessor wrapper around awk
// Copyright 2022 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_FIELD_H
#define __CPPAWK_FIELD_H

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

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

function delf(__at, __count,
              __i, __j)
{
  if (!__present(__count))
    __count = 1

  if (0 < __count && 1 <= __at && __at <= NF) {
    __i = __at
    __j = __at + __count

    while (__j <= NF)
      $(__i++) = $(__j++)

    NF = __i - 1;
  }
}

function __insf(__at, __count,
                __i, __j)
{
  if (!__present(__count))
    __count = 1

  if (NF < __at)
    NF = __at - 1

  if (0 < __count && 1 <= __at) {
    __i = NF + __count
    __j = NF

    NF = __i

    while (__j >= __at)
      $(__i--) = $(__j--)
    return 1
  }

  return 0
}

#define __insf_first(arg, n, at)        $(at + n - 1) = arg
#define __insf_next(prev, arg, n, at)   prev; $(at + n - 1) = arg

#define insf(at, ...) {                                                       \
  if (__insf(at, __narg(__VA_ARGS__))) {                                      \
    __variaexpand(__insf_first, __insf_next, at, __VA_ARGS__);                \
  }                                                                           \
}

#endif