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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Performance
# Do not compute the size of statically sized objects.
class FixedSize < Cop
MSG = 'Do not compute the size of statically sized objects.'.freeze
def_node_matcher :counter, <<-MATCHER
(send ${array hash str sym} {:count :length :size} $...)
MATCHER
def on_send(node)
return if allowed_parent?(node.parent)
counter(node) do |var, arg|
return if allowed_variable?(var) || allowed_argument?(arg)
add_offense(node, :expression)
end
end
private
def allowed_variable?(var)
contains_splat?(var) || contains_double_splat?(var)
end
def allowed_argument?(arg)
arg && non_string_argument?(arg.first)
end
def allowed_parent?(node)
node && (node.casgn_type? || node.block_type?)
end
def contains_splat?(node)
return unless node.array_type?
node.each_child_node(:splat).any?
end
def contains_double_splat?(node)
return unless node.hash_type?
node.each_child_node(:kwsplat).any?
end
def non_string_argument?(node)
node && !node.str_type?
end
end
end
end
end
Version data entries
17 entries across 17 versions & 2 rubygems