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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Metrics
# This cop checks for methods with too many parameters.
# The maximum number of parameters is configurable.
# Keyword arguments can optionally be excluded from the total count.
class ParameterLists < Cop
include ConfigurableMax
MSG = 'Avoid parameter lists longer than %<max>d parameters. ' \
'[%<count>d/%<max>d]'.freeze
def on_args(node)
count = args_count(node)
return unless count > max_params
return if argument_to_lambda_or_proc?(node)
add_offense(node) do
self.max = count
end
end
private
def_node_matcher :argument_to_lambda_or_proc?, <<-PATTERN
^lambda_or_proc?
PATTERN
def message(node)
format(MSG, max: max_params, count: args_count(node))
end
def args_count(node)
if count_keyword_args?
node.children.size
else
node.children.count { |a| !%i[kwoptarg kwarg].include?(a.type) }
end
end
def max_params
cop_config['Max']
end
def count_keyword_args?
cop_config['CountKeywordArgs']
end
end
end
end
end
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