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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# Checks that arrays are sliced with endless ranges instead of
# `ary[start..-1]` on Ruby 2.6+.
#
# @safety
# This cop is unsafe because `x..-1` and `x..` are only guaranteed to
# be equivalent for `Array#[]`, and the cop cannot determine what class
# the receiver is.
#
# For example:
# [source,ruby]
# ----
# sum = proc { |ary| ary.sum }
# sum[-3..-1] # => -6
# sum[-3..] # Hangs forever
# ----
#
# @example
# # bad
# items[1..-1]
#
# # good
# items[1..]
class SlicingWithRange < Base
extend AutoCorrector
extend TargetRubyVersion
minimum_target_ruby_version 2.6
MSG = 'Prefer ary[n..] over ary[n..-1].'
RESTRICT_ON_SEND = %i[[]].freeze
# @!method range_till_minus_one?(node)
def_node_matcher :range_till_minus_one?, '(irange !nil? (int -1))'
def on_send(node)
return unless node.arguments.count == 1
return unless range_till_minus_one?(node.arguments.first)
add_offense(node.first_argument) do |corrector|
corrector.remove(node.first_argument.end)
end
end
end
end
end
end
Version data entries
34 entries across 30 versions & 3 rubygems