stone_validators.py 文件源码

def __init__(self, min_length=None, max_length=None, pattern=None):
        if min_length is not None:
            assert isinstance(min_length, numbers.Integral), \
                'min_length must be an integral number'
            assert min_length >= 0, 'min_length must be >= 0'
        if max_length is not None:
            assert isinstance(max_length, numbers.Integral), \
                'max_length must be an integral number'
            assert max_length > 0, 'max_length must be > 0'
        if min_length and max_length:
            assert max_length >= min_length, 'max_length must be >= min_length'
        if pattern is not None:
            assert isinstance(pattern, six.string_types), \
                'pattern must be a string'

        self.min_length = min_length
        self.max_length = max_length
        self.pattern = pattern
        self.pattern_re = None

        if pattern:
            try:
                self.pattern_re = re.compile(r"\A(?:" + pattern + r")\Z")
            except re.error as e:
                raise AssertionError('Regex {!r} failed: {}'.format(
                    pattern, e.args[0]))