Sha256: d590b09b21df771249fe73128c58a80ee017a730789fbb05e13fa571b41f1287
Contents?: true
Size: 966 Bytes
Versions: 182
Compression:
Stored size: 966 Bytes
Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# 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 < Base
MSG = '`%<method>s` always returns `0`. Perhaps you meant `rand(2)` or `rand`?'
RESTRICT_ON_SEND = %i[rand].freeze
# @!method rand_one?(node)
def_node_matcher :rand_one?, <<~PATTERN
(send {(const {nil? cbase} :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
Version data entries
182 entries across 175 versions & 18 rubygems