def parse_hl_lines(expr):
    """Support our syntax for emphasizing certain lines of code.

    expr should be like '1 2' to emphasize lines 1 and 2 of a code block.
    Returns a list of ints, the line numbers to emphasize.
    """
    if not expr:
        return []

    try:
        return list(map(int, expr.split()))
    except __HOLE__:
        return []


# ------------------ The Main CodeHilite Class ----------------------
dataset/ETHPy150Open dragondjf/QMarkdowner/markdown/extensions/codehilite.py/parse_hl_lines