2018-10-15 14:42:47 +05:30
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# frozen_string_literal: true
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module RuboCop
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module Cop
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# Checks for return inside blocks.
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2019-12-04 20:38:33 +05:30
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# For more information see: https://gitlab.com/gitlab-org/gitlab-foss/issues/42889
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2018-10-15 14:42:47 +05:30
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#
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# @example
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# # bad
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# call do
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# return if something
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#
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# do_something_else
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# end
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#
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# # good
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# call do
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# break if something
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#
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# do_something_else
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# end
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#
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class AvoidReturnFromBlocks < RuboCop::Cop::Cop
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MSG = 'Do not return from a block, use next or break instead.'
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DEF_METHODS = %i[define_method lambda].freeze
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WHITELISTED_METHODS = %i[each each_filename times loop].freeze
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def on_block(node)
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block_body = node.body
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return unless block_body
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return unless top_block?(node)
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block_body.each_node(:return) do |return_node|
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next if parent_blocks(node, return_node).all?(&method(:whitelisted?))
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add_offense(return_node)
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end
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end
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private
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def top_block?(node)
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current_node = node
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top_block = nil
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while current_node && current_node.type != :def
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top_block = current_node if current_node.type == :block
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current_node = current_node.parent
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end
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top_block == node
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end
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def parent_blocks(node, current_node)
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blocks = []
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until node == current_node || def?(current_node)
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blocks << current_node if current_node.type == :block
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current_node = current_node.parent
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end
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blocks << node if node == current_node && !def?(node)
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blocks
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end
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def def?(node)
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node.type == :def || node.type == :defs ||
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(node.type == :block && DEF_METHODS.include?(node.method_name))
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end
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def whitelisted?(block_node)
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WHITELISTED_METHODS.include?(block_node.method_name)
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end
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end
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end
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end
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