class RuboCop::Cop::Layout::TrailingWhitespace


x = 0
# good
# The line in this example ends directly after the 0.
x = 0
# bad
# The line in this example contains spaces after the 0.
@example
This cop looks for trailing whitespace in the source code.

def autocorrect(range) 

def autocorrect(range)
  ->(corrector) { corrector.remove(range) }
end

def extract_heredoc_ranges(ast) 

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

def inside_heredoc?(heredoc_ranges, line_number) 

def inside_heredoc?(heredoc_ranges, line_number)
  heredoc_ranges.any? { |r| r.include?(line_number) }
end

def investigate(processed_source) 

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 skip_heredoc? 

def skip_heredoc?
  cop_config.fetch('AllowInHeredoc', false)
end