lib/rubocop/cop/favor_sprintf.rb


# encoding: utf-8

module Rubocop
  module Cop
    class FavorSprintf < Cop
      MSG = 'Favor sprintf over String#%.'

      def on_send(node)
        receiver_node, method_name, *arg_nodes = *node

        if method_name == :% &&
            ([:str, :dstr].include?(receiver_node.type) ||
             arg_nodes[0].type == :array)
          add_offence(:convention, node.loc.expression.line, MSG)
        end

        super
      end
    end
  end
end