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Contents
# encoding: utf-8
module RuboCop
module Cop
module Style
# This cop checks for the use of a method, the result of which
# would be a literal, like an empty array, hash or string.
class EmptyLiteral < Cop
ARR_MSG = 'Use array literal [] instead of Array.new.'
HASH_MSG = 'Use hash literal {} instead of Hash.new.'
STR_MSG = "Use string literal '' instead of String.new."
# Empty array node
#
# (send
# (const nil :Array) :new)
ARRAY_NODE = s(:send, s(:const, nil, :Array), :new)
# Empty hash node
#
# (send
# (const nil :Hash) :new)
HASH_NODE = s(:send, s(:const, nil, :Hash), :new)
# Empty string node
#
# (send
# (const nil :String) :new)
STR_NODE = s(:send, s(:const, nil, :String), :new)
def on_send(node)
return if part_of_ignored_node?(node)
case node
when ARRAY_NODE
add_offense(node, :expression, ARR_MSG)
when HASH_NODE
add_offense(node, :expression, HASH_MSG)
when STR_NODE
add_offense(node, :expression, STR_MSG)
end
end
# TODO: Check block contents as well.
alias_method :on_block, :ignore_node
def autocorrect(node)
@corrections << lambda do |corrector|
name = case node
when ARRAY_NODE then '[]'
when HASH_NODE then '{}'
when STR_NODE then "''"
end
corrector.replace(node.loc.expression, name)
end
end
end
end
end
end
Version data entries
9 entries across 9 versions & 2 rubygems