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Contents
# encoding: utf-8
module RuboCop
module Cop
module Style
# The purpose of the this cop is advise the use of
# alias_method over the alias keyword whenever possible.
class Alias < Cop
MSG = 'Use `alias_method` instead of `alias`.'
def on_block(node)
method, _args, body = *node
_receiver, method_name = *method
# using alias is the only option in certain scenarios
# in such scenarios we don't want to report an offense
return unless method_name == :instance_exec
body.each_node(:alias) { |n| ignore_node(n) }
end
def on_alias(node)
return if ignored_node?(node)
# alias_method can't be used with global variables
new, old = *node
return if new.type == :gvar && old.type == :gvar
add_offense(node, :keyword)
end
def autocorrect(node)
@corrections << lambda do |corrector|
# replace alias with alias_method
corrector.replace(node.loc.keyword, 'alias_method')
# insert a comma
new, old = *node
corrector.insert_after(new.loc.expression, ',')
# convert bareword arguments to symbols
corrector.replace(new.loc.expression, ":#{new.children.first}")
corrector.replace(old.loc.expression, ":#{old.children.first}")
end
end
end
end
end
end
Version data entries
11 entries across 11 versions & 2 rubygems