module RuboCop::Cop::PercentLiteral

def begin_source(node)
  node.loc.begin.source if node.loc?(:begin)
end

def percent_literal?(node)
  return false unless (begin_source = begin_source(node))
  begin_source.start_with?('%')
end

def process(node, *types)
  return unless percent_literal?(node) && types.include?(type(node))
  on_percent_literal(node)
end

def type(node)
  node.loc.begin.source[0..-2]
end