lib/rubocop/cop/mixin/method_complexity.rb
# frozen_string_literal: true
module RuboCop
module Cop
# @api private
#
# This module handles measurement and reporting of complexity in methods.
module MethodComplexity
include AllowedMethods
include AllowedPattern
include Metrics::Utils::RepeatedCsendDiscount
extend NodePattern::Macros
extend ExcludeLimit
exclude_limit 'Max'
def on_def(node)
return if allowed_method?(node.method_name) || matches_allowed_pattern?(node.method_name)
check_complexity(node, node.method_name)
end
alias on_defs on_def
def on_block(node)
define_method?(node) do |name|
return if allowed_method?(name) || matches_allowed_pattern?(name)
check_complexity(node, name)
end
end
alias on_numblock on_block
private
# @!method define_method?(node)
def_node_matcher :define_method?, <<~PATTERN
({block numblock}
(send nil? :define_method ({sym str} $_)) _ _)
PATTERN
def check_complexity(node, method_name)
# Accepts empty methods always.
return unless node.body
max = cop_config['Max']
reset_repeated_csend
complexity, abc_vector = complexity(node.body)
return unless complexity > max
msg = format(
self.class::MSG,
method: method_name, complexity: complexity, abc_vector: abc_vector, max: max
)
location = location(node)
add_offense(location, message: msg) { self.max = complexity.ceil }
end
def complexity(body)
score = 1
body.each_node(:lvasgn, *self.class::COUNTED_NODES) do |node|
if node.lvasgn_type?
reset_on_lvasgn(node)
else
score += complexity_score_for(node)
end
end
score
end
def location(node)
if LSP.enabled?
end_range = node.loc.respond_to?(:name) ? node.loc.name : node.loc.begin
node.source_range.begin.join(end_range)
else
node.source_range
end
end
end
end
end