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Contents
# encoding: utf-8
module RuboCop
module Cop
module Metrics
# This cop checks for excessive nesting of conditional and looping
# constructs. Despite the cop's name, blocks are not considered as an
# extra level of nesting.
#
# The maximum level of nesting allowed is configurable.
class BlockNesting < Cop
include ConfigurableMax
NESTING_BLOCKS = [
:case, :if, :while, :while_post,
:until, :until_post, :for, :resbody
]
def investigate(processed_source)
return unless processed_source.ast
max = cop_config['Max']
check_nesting_level(processed_source.ast, max, 0)
end
private
def check_nesting_level(node, max, current_level)
if NESTING_BLOCKS.include?(node.type)
unless node.loc.respond_to?(:keyword) &&
node.loc.keyword.is?('elsif')
current_level += 1
end
if current_level > max
self.max = current_level
unless part_of_ignored_node?(node)
add_offense(node, :expression, 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 message(max)
"Avoid more than #{max} levels of block nesting."
end
end
end
end
end
Version data entries
4 entries across 4 versions & 2 rubygems