comparison mercurial/match.py @ 40775:4e02f25f31c6

match: test for overflow error in pattern

If a single pattern is too large to handle, we raise an exception. This case is
now doctested.

40774:8306dac48061

MAX_RE_SIZE = 20000

def _buildregexmatch(kindpats, globsuffix):
    """Build a match function from a list of kinds and kindpats,
    return regexp string and a matcher function."""
    try:
        regex = '(?:%s)' % '|'.join([_regex(k, p, globsuffix)
                                     for (k, p, s) in kindpats])
        if len(regex) <= MAX_RE_SIZE:
            return regex, _rematcher(regex)

40775:4e02f25f31c6

MAX_RE_SIZE = 20000

def _buildregexmatch(kindpats, globsuffix):
    """Build a match function from a list of kinds and kindpats,
    return regexp string and a matcher function.

    Test too large input
    >>> _buildregexmatch([
    ...     ('relglob', '?' * MAX_RE_SIZE, '')
    ... ], '$')
    Traceback (most recent call last):
    ...
    OverflowError
    """
    try:
        regex = '(?:%s)' % '|'.join([_regex(k, p, globsuffix)
                                     for (k, p, s) in kindpats])
        if len(regex) <= MAX_RE_SIZE:
            return regex, _rematcher(regex)