CSV::Parser#detect_row_separator

# File tmp/rubies/ruby-3.3.0/lib/csv/parser.rb, line 716
def detect_row_separator(sample, cr, lf)
  lf_index = sample.index(lf)
  if lf_index
    cr_index = sample[0, lf_index].index(cr)
  else
    cr_index = sample.index(cr)
  end
  if cr_index and lf_index
    if cr_index + 1 == lf_index
      cr + lf
    elsif cr_index < lf_index
      cr
    else
      lf
    end
  elsif cr_index
    cr
  elsif lf_index
    lf
  else
    :auto
  end
end