lib/rubocop/cop/layout/first_array_element_line_break.rb
# frozen_string_literal: true
module RuboCop
module Cop
module Layout
# Checks for a line break before the first element in a
# multi-line array.
#
# @example
#
# # bad
# [ :a,
# :b]
#
# # good
# [
# :a,
# :b]
#
# # good
# [:a, :b]
#
# @example AllowMultilineFinalElement: false (default)
#
# # bad
# [ :a, {
# :b => :c
# }]
#
# # good
# [
# :a, {
# :b => :c
# }]
#
# @example AllowMultilineFinalElement: true
#
# # good
# [:a, {
# :b => :c
# }]
#
class FirstArrayElementLineBreak < Base
include FirstElementLineBreak
extend AutoCorrector
MSG = 'Add a line break before the first element of a multi-line array.'
def on_array(node)
return if !node.loc.begin && !assignment_on_same_line?(node)
check_children_line_break(node, node.children, ignore_last: ignore_last_element?)
end
private
def assignment_on_same_line?(node)
source = node.source_range.source_line[0...node.loc.column]
/\s*=\s*$/.match?(source)
end
def ignore_last_element?
!!cop_config['AllowMultilineFinalElement']
end
end
end
end
end