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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Layout
# This cop looks for trailing whitespace in the source code.
#
# @example
# # The line in this example contains spaces after the 0.
# # bad
# x = 0
#
# # The line in this example ends directly after the 0.
# # good
# x = 0
#
class TrailingWhitespace < Cop
include RangeHelp
MSG = 'Trailing whitespace detected.'.freeze
def investigate(processed_source)
heredoc_ranges = extract_heredoc_ranges(processed_source.ast)
processed_source.lines.each_with_index do |line, index|
next unless line.end_with?(' ', "\t")
next if skip_heredoc? && inside_heredoc?(heredoc_ranges, index + 1)
range = source_range(processed_source.buffer,
index + 1,
(line.rstrip.length)...(line.length))
add_offense(range, location: range)
end
end
def autocorrect(range)
->(corrector) { corrector.remove(range) }
end
private
def skip_heredoc?
cop_config.fetch('AllowInHeredoc', false)
end
def inside_heredoc?(heredoc_ranges, line_number)
heredoc_ranges.any? { |r| r.include?(line_number) }
end
def extract_heredoc_ranges(ast)
return [] unless ast
ast.each_node(:str, :dstr, :xstr).select(&:heredoc?).map do |node|
body = node.location.heredoc_body
(body.first_line...body.last_line)
end
end
end
end
end
end
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