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# frozen_string_literal: true
module RuboCop
module Cop
module InternalAffairs
# Checks for missing `numblock handlers. The blocks with numbered
# arguments introduced in Ruby 2.7 are parsed with a node type of
# `numblock` instead of block. Cops that define `block` handlers
# need to define `numblock` handlers or disable this cope for them.
#
# @example
#
# # bad
# class BlockRelatedCop < Base
# def on_block(node)
# end
# end
#
# # good
# class BlockRelatedCop < Base
# def on_block(node)
# end
#
# alias on_numblock on_block
# end
#
# class BlockRelatedCop < Base
# def on_block(node)
# end
#
# alias_method :on_numblock, :on_block
# end
#
# class BlockRelatedCop < Base
# def on_block(node)
# end
#
# def on_numblock(node)
# end
# end
class NumblockHandler < Base
MSG = 'Define on_numblock to handle blocks with numbered arguments.'
def on_def(node)
return unless block_handler?(node)
return unless node.parent
add_offense(node) unless numblock_handler?(node.parent)
end
private
# @!method block_handler?(node)
def_node_matcher :block_handler?, <<~PATTERN
(def :on_block (args (arg :node)) ...)
PATTERN
# @!method numblock_handler?(node)
def_node_matcher :numblock_handler?, <<~PATTERN
{
`(def :on_numblock (args (arg :node)) ...)
`(alias (sym :on_numblock) (sym :on_block))
`(send nil? :alias_method (sym :on_numblock) (sym :on_block))
}
PATTERN
end
end
end
end
Version data entries
176 entries across 171 versions & 18 rubygems