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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# This cop checks for redundant `with_index`.
#
# @example
# # bad
# ary.each_with_index do |v|
# v
# end
#
# # good
# ary.each do |v|
# v
# end
#
# # bad
# ary.each.with_index do |v|
# v
# end
#
# # good
# ary.each do |v|
# v
# end
#
class RedundantWithIndex < Cop
include RangeHelp
MSG_EACH_WITH_INDEX = 'Use `each` instead of `each_with_index`.'.freeze
MSG_WITH_INDEX = 'Remove redundant `with_index`.'.freeze
def_node_matcher :redundant_with_index?, <<-PATTERN
(block
$(send
_ {:each_with_index :with_index} ...)
(args
(arg _))
...)
PATTERN
def on_block(node)
redundant_with_index?(node) do |send|
add_offense(node, location: with_index_range(send))
end
end
def autocorrect(node)
lambda do |corrector|
redundant_with_index?(node) do |send|
if send.method_name == :each_with_index
corrector.replace(send.loc.selector, 'each')
else
corrector.remove(with_index_range(send))
corrector.remove(send.loc.dot)
end
end
end
end
private
def message(node)
if node.method_name == :each_with_index
MSG_EACH_WITH_INDEX
else
MSG_WITH_INDEX
end
end
def with_index_range(send)
range_between(
send.loc.selector.begin_pos,
send.loc.expression.end_pos
)
end
end
end
end
end
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