class RuboCop::Cop::Style::SpaceAroundEqualsInParameterDefault

def autocorrect(range)
  m = range.source.match(/=\s*(\S+)/)
  rest = m ? m.captures[0] : ''
  replacement = style == :space ? ' = ' : '='
  ->(corrector) { corrector.replace(range, replacement + rest) }
end

def check_optarg(arg, equals, value)
  space_on_both_sides = space_on_both_sides?(arg, equals, value)
  no_surrounding_space = no_surrounding_space?(arg, equals, value)
  if style == :space && space_on_both_sides ||
     style == :no_space && no_surrounding_space
    correct_style_detected
  else
    incorrect_style_detected(arg, value, space_on_both_sides,
                             no_surrounding_space)
  end
end

def incorrect_style_detected(arg, value, space_on_both_sides,
                             no_surrounding_space)
  range = Parser::Source::Range.new(processed_source.buffer,
                                    arg.pos.end_pos,
                                    value.pos.begin_pos)
  add_offense(range, range) do
    if style == :space && no_surrounding_space ||
       style == :no_space && space_on_both_sides
      opposite_style_detected
    else
      unrecognized_style_detected
    end
  end
end

def message(_)
  format('Surrounding space %s in default value assignment.',
         style == :space ? 'missing' : 'detected')
end

def no_surrounding_space?(arg, equals, value)
  !space_between?(arg, equals) && !space_between?(equals, value)
end

def on_optarg(node)
  index = index_of_first_token(node)
  arg, equals, value = processed_source.tokens[index, 3]
  check_optarg(arg, equals, value)
end

def space_on_both_sides?(arg, equals, value)
  space_between?(arg, equals) && space_between?(equals, value)
end