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Contents
# frozen_string_literal: true
require 'set'
module RuboCop
module Cop
module Layout
# This cop checks for two or more consecutive blank lines.
#
# @example
#
# # bad - It has two empty lines.
# some_method
# # one empty line
# # two empty lines
# some_method
#
# # good
# some_method
# # one empty line
# some_method
#
class EmptyLines < Cop
include RangeHelp
MSG = 'Extra blank line detected.'.freeze
LINE_OFFSET = 2
def investigate(processed_source)
return if processed_source.tokens.empty?
lines = Set.new
processed_source.each_token do |token|
lines << token.line
end
each_extra_empty_line(lines.sort) do |range|
add_offense(range, location: range)
end
end
def autocorrect(range)
->(corrector) { corrector.remove(range) }
end
private
def each_extra_empty_line(lines)
prev_line = 1
lines.each do |cur_line|
if exceeds_line_offset?(cur_line - prev_line)
# we need to be wary of comments since they
# don't show up in the tokens
((prev_line + 1)...cur_line).each do |line|
next unless previous_and_current_lines_empty?(line)
yield source_range(processed_source.buffer, line, 0)
end
end
prev_line = cur_line
end
end
def exceeds_line_offset?(line_diff)
line_diff > LINE_OFFSET
end
def previous_and_current_lines_empty?(line)
processed_source[line - 2].empty? && processed_source[line - 1].empty?
end
end
end
end
end
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