src/builtins/shift_builtin.cpp


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/*
   Please use git log for copyright holder and year information

   This file is part of libbash.

   libbash is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 2 of the License, or
   (at your option) any later version.

   libbash 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with libbash.  If not, see <http://www.gnu.org/licenses/>.
*/
///
/// \file shift_builtin.h
/// \brief implementation for the shift builtin
///
#include "builtins/shift_builtin.h"

#include <boost/lexical_cast.hpp>

#include "builtins/builtin_exceptions.h"
#include "core/exceptions.h"
#include "core/interpreter.h"

int shift_builtin::exec(const std::vector<std::string>& bash_args)
{
  int shift_number = 1;

  if(!bash_args.empty())
  {
    if(bash_args.size() != 1)
      throw libbash::illegal_argument_exception("shift: the number of arguments should be 1");

    shift_number = boost::lexical_cast<int>(bash_args[0]);
  }

  return _walker.shift(shift_number);
}