lib/rubocop/cop/layout/multiline_hash_key_line_breaks.rb
# frozen_string_literal: true
module RuboCop
module Cop
module Layout
# Ensures that each key in a multi-line hash
# starts on a separate line.
#
# @example
#
# # bad
# {
# a: 1, b: 2,
# c: 3
# }
#
# # good
# {
# a: 1,
# b: 2,
# c: 3
# }
#
# # good
# {
# a: 1,
# b: {
# c: 3,
# }
# }
#
# @example AllowMultilineFinalElement: false (default)
#
# # bad
# { a: 1, b: {
# c: 3,
# }}
#
# @example AllowMultilineFinalElement: true
#
# # good
# { a: 1, b: {
# c: 3,
# }}
#
class MultilineHashKeyLineBreaks < Base
include MultilineElementLineBreaks
extend AutoCorrector
MSG = 'Each key in a multi-line hash must start on a separate line.'
def on_hash(node)
# This cop only deals with hashes wrapped by a set of curly
# braces like {foo: 1}. That is, not a kwargs hashes.
# Style/MultilineMethodArgumentLineBreaks handles those.
return unless starts_with_curly_brace?(node)
return unless node.loc.begin
check_line_breaks(node, node.children, ignore_last: ignore_last_element?)
end
private
def starts_with_curly_brace?(node)
node.loc.begin
end
def ignore_last_element?
!!cop_config['AllowMultilineFinalElement']
end
end
end
end
end