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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Metrics
# This cop checks for excessive nesting of conditional and looping
# constructs.
#
# You can configure if blocks are considered using the `CountBlocks`
# option. When set to `false` (the default) blocks are not counted
# towards the nesting level. Set to `true` to count blocks as well.
#
# The maximum level of nesting allowed is configurable.
class BlockNesting < Cop
include ConfigurableMax
NESTING_BLOCKS = %i[
case if while while_post
until until_post for resbody
].freeze
def investigate(processed_source)
return if processed_source.blank?
max = cop_config['Max']
check_nesting_level(processed_source.ast, max, 0)
end
private
def check_nesting_level(node, max, current_level)
if consider_node?(node)
current_level += 1 unless node.if_type? && node.elsif?
if current_level > max
self.max = current_level
unless part_of_ignored_node?(node)
add_offense(node, message: message(max)) do
ignore_node(node)
end
end
end
end
node.each_child_node do |child_node|
check_nesting_level(child_node, max, current_level)
end
end
def consider_node?(node)
return true if NESTING_BLOCKS.include?(node.type)
count_blocks? && node.block_type?
end
def message(max)
"Avoid more than #{max} levels of block nesting."
end
def count_blocks?
cop_config['CountBlocks']
end
end
end
end
end
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