return CharSource.this.toString() + ".asByteSource(" + charset + ")";
    }
  }

  private static class CharSequenceCharSource extends CharSource {

    private static final Splitter LINE_SPLITTER = Splitter.onPattern("\r\n|\n|\r");

    protected final CharSequence seq;

    protected CharSequenceCharSource(CharSequence seq) {
      this.seq = checkNotNull(seq);
    }

    @Override