module Byebug::ParseFunctions

def get_int(str, cmd, min=nil, max=nil, default=1)
  return default unless str
  begin
    int = Integer(str)
    if min and int < min
      print "\"#{cmd}\" argument \"#{str}\" needs to be at least #{min}.\n"
      return nil
    elsif max and int > max
      print "\"#{cmd}\" argument \"#{str}\" needs to be at most #{max}.\n"
      return nil
    end
    return int
  rescue
    print "\"#{cmd}\" argument \"#{str}\" needs to be a number.\n"
    return nil
  end
end

def get_onoff(arg, default=nil, print_error=true)
  if arg.nil? or arg == ''
    if default.nil?
      if print_error
        print "Expecting 'on', 1, 'off', or 0. Got nothing.\n"
        raise RuntimeError
      end
      return default
    end
  end
  case arg.downcase
  when '1', 'on'
    return true
  when '0', 'off'
    return false
  else
    if print_error
      print "Expecting 'on', 1, 'off', or 0. Got: #{arg.to_s}.\n"
      raise RuntimeError
    end
  end
end

def show_onoff(bool)
  if not [TrueClass, FalseClass, NilClass].member?(bool.class)
    return "??"
  end
  return bool ? 'on' : 'off'
end

def syntax_valid?(code)
  eval("BEGIN {return true}\n#{code}", nil, "", 0)
rescue Exception
  false
end