Class Option

docopt.py:186–223

class Option(ChildPattern):

    def __init__(self, short=None, long=None, argcount=0, value=False):
        assert argcount in (0, 1)
        self.short, self.long = short, long
        self.argcount, self.value = argcount, value
        self.value = None if value is False and argcount else value

    @classmethod
    def parse(class_, option_description):
        short, long, argcount, value = None, None, 0, False
        options, _, description = option_description.strip().partition('  ')
        options = options.replace(',', ' ').replace('=', ' ')
        for s in options.split():
            if s.startswith('--'):
                long = s
            elif s.startswith('-'):
                short = s
            else:
                argcount = 1
        if argcount:
            matched = re.findall('\[default: (.*)\]', description, flags=re.I)
            value = matched[0] if matched else None
        return class_(short, long, argcount, value)

    def single_match(self, left):
        for n, p in enumerate(left):
            if self.name == p.name:
                return n, p
        return None, None

    @property
    def name(self):
        return self.long or self.short

    def __repr__(self):
        return 'Option(%r, %r, %r, %r)' % (self.short, self.long,
                                           self.argcount, self.value)


class Required(ParentPattern):