Source code for shuup.utils.babel_precision_provider

import decimal
from collections import defaultdict

import babel.core

_cache = None
_default = None




def get_precision(currency):
    """
    Get precisision for given currency from Babel.

    :type currency: str
    :param currency: Currency code as 3-letter string (ISO-4217)

    :rtype: decimal.Decimal
    :return: Precision value for given currency code
    """
    global _cache
    if _cache is None:
        _cache = _generate_cache()
    return _cache[currency]



def _generate_cache():
    currency_fractions = babel.core.get_global("currency_fractions")
    values = {currency: decimal.Decimal("0.1") ** data[0] for (currency, data) in currency_fractions.items()}
    default = values.pop("DEFAULT")
    cache = defaultdict(lambda: default)
    cache.update(values)
    return cache