each_line

# File lib/csv/parser.rb, line 63
      def each_line(row_separator)
        buffer = nil
        input = @scanner.rest
        position = @scanner.pos
        offset = 0
        n_row_separator_chars = row_separator.size
        while true
          input.each_line(row_separator) do |line|
            @scanner.pos += line.bytesize
            if buffer
              if n_row_separator_chars == 2 and
                buffer.end_with?(row_separator[0]) and
                line.start_with?(row_separator[1])
                buffer << line[0]
                line = line[1..-1]
                position += buffer.bytesize + offset
                @scanner.pos = position
                offset = 0
                yield(buffer)
                buffer = nil
                next if line.empty?
              else
                buffer << line
                line = buffer
                buffer = nil
              end
            end
            if line.end_with?(row_separator)
              position += line.bytesize + offset
              @scanner.pos = position
              offset = 0
              yield(line)
            else
              buffer = line
            end
          end
          break unless read_chunk
          input = @scanner.rest
          position = @scanner.pos
          offset = -buffer.bytesize if buffer
        end
        yield(buffer) if buffer
      end