Function lazy_number

django/utils/translation/__init__.py:115–164

(func, resultclass, number=None, **kwargs)

def lazy_number(func, resultclass, number=None, **kwargs):
    if isinstance(number, int):
        kwargs["number"] = number
        proxy = lazy(func, resultclass)(**kwargs)
    else:
        original_kwargs = kwargs.copy()

        class NumberAwareString(resultclass):
            def __bool__(self):
                return bool(kwargs["singular"])

            def _get_number_value(self, values):
                try:
                    return values[number]
                except KeyError:
                    raise KeyError(
                        "Your dictionary lacks key '%s'. Please provide "
                        "it, because it is required to determine whether "
                        "string is singular or plural." % number
                    )

            def _translate(self, number_value):
                kwargs["number"] = number_value
                return func(**kwargs)

            def format(self, *args, **kwargs):
                number_value = (
                    self._get_number_value(kwargs) if kwargs and number else args[0]
                )
                return self._translate(number_value).format(*args, **kwargs)

            def __mod__(self, rhs):
                if isinstance(rhs, dict) and number:
                    number_value = self._get_number_value(rhs)
                else:
                    number_value = rhs
                translated = self._translate(number_value)
                try:
                    translated %= rhs
                except TypeError:
                    # String doesn't contain a placeholder for the number.
                    pass
                return translated

        proxy = lazy(lambda **kwargs: NumberAwareString(), NumberAwareString)(**kwargs)
        proxy.__reduce__ = lambda: (
            _lazy_number_unpickle,
            (func, resultclass, number, original_kwargs),
        )
    return proxy


def _lazy_number_unpickle(func, resultclass, number, kwargs):