Class LineColumnReader

src/main/java/groovy/io/LineColumnReader.java:32–291

The LineColumnReader is an extension to BufferedReader that keeps track of the line and column information of where the cursor is. @since 1.8.0

 * @since 1.8.0
 */
public class LineColumnReader extends BufferedReader {

    /**
     * The current line position
     */
    private long line = 1;

    /**
     * The current column position
     */
    private long column = 1;

    /**
     * The latest marked line position
     */
    private long lineMark = 1;

    /**
     * The latest marked line position
     */
    private long columnMark = 1;

    private boolean newLineWasRead = false;

    /**
     * Constructor wrapping a <code>Reader</code>
     * (<code>FileReader</code>, <code>FileReader</code>, <code>InputStreamReader</code>, etc.)
     *
     * @param reader the reader to wrap
     */
    public LineColumnReader(Reader reader) {
        super(reader);
    }

    /**
     * Marks the present position in the stream. Subsequent calls to reset() will attempt to reposition the stream to this point.
     *
     * @param readAheadLimit  Limit on the number of characters that may be read while still preserving the mark.
     *      An attempt to reset the stream after reading characters up to this limit or beyond may fail.
     *      A limit value larger than the size of the input buffer will cause a new buffer to be allocated whose size is no smaller than limit.
     *      Therefore large values should be used with care.
     */
    @Override
    public void mark(int readAheadLimit) throws IOException {
        lineMark = line;
        columnMark = column;
        super.mark(readAheadLimit);
    }

    /**
     * Resets the stream to the most recent mark.
     */
    @Override
    public void reset() throws IOException {
        line = lineMark;
        column = columnMark;
        super.reset();
    }