@classmethod
def join_multilines(cls, value, lines):
    """Scan for multiline value which is prefixed with a space or tab"""
    while lines:
        line = lines.popleft()
        if not line:
            break
        if line[0] not in (' ', '\t'):
            lines.appendleft(line)
            break
        value = '{}{}'.format(value, line[1:])
    return value
