* call {@link #finish} at the end of stream.
 *
 * @author Chris Nokleberg
 * @since 1.0
 */
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault
abstract class LineBuffer {
  /** Holds partial line contents. */
  private StringBuilder line = new StringBuilder();
  /** Whether a line ending with a CR is pending processing. */
  private boolean sawReturn;

  /**

    }
  }

  private static List<String> bufferHelper(String input, int chunk) throws IOException {
    final List<String> lines = Lists.newArrayList();
    LineBuffer lineBuf =
        new LineBuffer() {
          @Override
          protected void handleLine(String line, String end) {
            lines.add(line + end);
          }
        };
    char[] chars = input.toCharArray();

    }
  }

  private static List<String> bufferHelper(String input, int chunk) throws IOException {
    final List<String> lines = Lists.newArrayList();
    LineBuffer lineBuf =
        new LineBuffer() {
          @Override
          protected void handleLine(String line, String end) {
            lines.add(line + end);
          }
        };
    char[] chars = input.toCharArray();

  private final CharBuffer cbuf = createBuffer();
  private final char[] buf = cbuf.array();

  private final Queue<String> lines = new ArrayDeque<>();
  private final LineBuffer lineBuf =
      new LineBuffer() {
        @Override
        protected void handleLine(String line, String end) {
          lines.add(line);
        }
      };