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Versions: 29
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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# This cop checks for duplicate `require`s and `require_relative`s.
#
# @example
# # bad
# require 'foo'
# require 'bar'
# require 'foo'
#
# # good
# require 'foo'
# require 'bar'
#
# # good
# require 'foo'
# require_relative 'foo'
#
class DuplicateRequire < Base
MSG = 'Duplicate `%<method>s` detected.'
REQUIRE_METHODS = %i[require require_relative].freeze
RESTRICT_ON_SEND = REQUIRE_METHODS
def_node_matcher :require_call?, <<~PATTERN
(send {nil? (const _ :Kernel)} {:#{REQUIRE_METHODS.join(' :')}} _)
PATTERN
def on_new_investigation
# Holds the known required files for a given parent node (used as key)
@required = Hash.new { |h, k| h[k] = Set.new }.compare_by_identity
super
end
def on_send(node)
return unless require_call?(node)
return if @required[node.parent].add?("#{node.method_name}#{node.first_argument}")
add_offense(node, message: format(MSG, method: node.method_name))
end
end
end
end
end
Version data entries
29 entries across 29 versions & 2 rubygems