class RuboCop::Cop::Layout::SpaceInsideHashLiteralBraces

def range_of_space_to_the_left(range)
  src = range.source_buffer.source
  begin_pos = range.begin_pos
  begin_pos -= 1 while src[begin_pos - 1] =~ /[ \t]/
  range_between(begin_pos, range.end_pos - 1)
end