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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# This cop checks for `rand(1)` calls.
# Such calls always return `0`.
#
# @example
#
# # bad
#
# rand 1
# Kernel.rand(-1)
# rand 1.0
# rand(-1.0)
#
# @example
#
# # good
#
# 0 # just use 0 instead
class RandOne < Cop
MSG = '`%<method>s` always returns `0`. ' \
'Perhaps you meant `rand(2)` or `rand`?'.freeze
def_node_matcher :rand_one?, <<-PATTERN
(send {(const nil? :Kernel) nil?} :rand {(int {-1 1}) (float {-1.0 1.0})})
PATTERN
def on_send(node)
return unless rand_one?(node)
add_offense(node)
end
private
def message(node)
format(MSG, method: node.source)
end
end
end
end
end
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