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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# This cop checks for cases when you could use a block
# accepting version of a method that does automatic
# resource cleanup.
#
# @example
#
# # bad
# f = File.open('file')
#
# # good
# File.open('file') do |f|
# # ...
# end
class AutoResourceCleanup < Cop
MSG = 'Use the block version of `%<class>s.%<method>s`.'.freeze
TARGET_METHODS = {
File: :open
}.freeze
def on_send(node)
TARGET_METHODS.each do |target_class, target_method|
target_receiver = s(:const, nil, target_class)
next if node.receiver != target_receiver
next if node.method_name != target_method
next if cleanup?(node)
add_offense(node,
message: format(MSG,
class: target_class,
method: target_method))
end
end
private
def cleanup?(node)
parent = node.parent
node.block_argument? ||
(parent && (parent.block_type? || !parent.lvasgn_type?))
end
end
end
end
end
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6,790 entries across 6,784 versions & 25 rubygems