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# frozen_string_literal: true
module RuboCop
module Cop
module Layout
# Checks for a newline after the final magic comment.
#
# @example
# # good
# # frozen_string_literal: true
#
# # Some documentation for Person
# class Person
# # Some code
# end
#
# # bad
# # frozen_string_literal: true
# # Some documentation for Person
# class Person
# # Some code
# end
class EmptyLineAfterMagicComment < Cop
include RangeHelp
MSG = 'Add an empty line after magic comments.'.freeze
def investigate(source)
return unless source.ast &&
(last_magic_comment = last_magic_comment(source))
return if source[last_magic_comment.loc.line].strip.empty?
offending_range =
source_range(source.buffer, last_magic_comment.loc.line + 1, 0)
add_offense(offending_range, location: offending_range)
end
def autocorrect(token)
lambda do |corrector|
corrector.insert_before(token, "\n")
end
end
private
# Find the last magic comment in the source file.
#
# Take all comments that precede the first line of code, select the
# magic comments, and return the last magic comment in the file.
#
# @return [Parser::Source::Comment] if magic comments exist before code
# @return [nil] otherwise
def last_magic_comment(source)
source
.comments
.take_while { |comment| comment.loc.line < source.ast.loc.line }
.select { |comment| MagicComment.parse(comment.text).any? }
.last
end
end
end
end
end
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