Source code for astropy.units.format.base

# Licensed under a 3-clause BSD style license - see LICENSE.rst

from __future__ import (absolute_import, division, print_function,
                        unicode_literals)


from ...utils.misc import InheritDocstrings
from ...extern import six


class _FormatterMeta(InheritDocstrings):
    registry = {}

    def __new__(mcls, name, bases, members):
        if 'name' in members:
            formatter_name = members['name'].lower()
        else:
            formatter_name = members['name'] = name.lower()

        cls = super(mcls, _FormatterMeta).__new__(mcls, name, bases, members)

        mcls.registry[formatter_name] = cls

        return cls


[docs]@six.add_metaclass(_FormatterMeta) class Base(object): """ The abstract base class of all unit formats. """ def __new__(cls, *args, **kwargs): # This __new__ is to make it clear that there is no reason to # instantiate a Formatter--if you try to you'll just get back the # class return cls
[docs] @classmethod def parse(cls, s): """ Convert a string to a unit object. """ raise NotImplementedError(
"Can not parse {0}".format(cls.__name__))
[docs] @classmethod def to_string(cls, u): """ Convert a unit object to a string. """ raise NotImplementedError(
"Can not output in {0} format".format(cls.__name__))