class RuboCop::Cop::Style::PercentLiteralDelimiters

def matchpairs(begin_delimiter)

def matchpairs(begin_delimiter)
  {
    '(' => %w[( )],
    '[' => %w[[ ]],
    '{' => %w[{ }],
    '<' => %w[< >]
  }.fetch(begin_delimiter, [begin_delimiter])
end