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# 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.
# On Ruby 2.0+ keyword arguments can optionally
# be excluded from the total count.
class ParameterLists < Cop
include ConfigurableMax
MSG = 'Avoid parameter lists longer than %d parameters. [%d/%d]'.freeze
def on_args(node)
count = args_count(node)
return unless count > max_params
message = format(MSG, max_params, count, max_params)
add_offense(node, :expression, message) do
self.max = count
end
end
private
def args_count(node)
if count_keyword_args?
node.children.size
else
node.children.count { |a| ![: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