Misago/misago/conf/hydrators.py

# fixme: rename this module to serialize
def hydrate_string(dry_value):
    return str(dry_value) if dry_value else ""


def dehydrate_string(wet_value):
    return str(wet_value)


def hydrate_bool(dry_value):
    return dry_value == "True"


def dehydrate_bool(wet_value):
    return "True" if wet_value else "False"


def hydrate_int(dry_value):
    return int(dry_value or 0)


def dehydrate_int(wet_value):
    return str(wet_value or 0)


def hydrate_list(dry_value):
    if dry_value:
        return [x for x in dry_value.split(",") if x]
    return []


def dehydrate_list(wet_value):
    return ",".join(wet_value) if wet_value else ""


def noop(value):
    return value


VALUE_HYDRATORS = {
    "string": (hydrate_string, dehydrate_string),
    "bool": (hydrate_bool, dehydrate_bool),
    "int": (hydrate_int, dehydrate_int),
    "list": (hydrate_list, dehydrate_list),
    "image": (noop, noop),
}


def hydrate_value(python_type, dry_value):
    try:
        value_hydrator = VALUE_HYDRATORS[python_type][0]
    except KeyError:
        raise ValueError("%s type is not hydrateable" % python_type)

    return value_hydrator(dry_value)


def dehydrate_value(python_type, wet_value):
    try:
        value_dehydrator = VALUE_HYDRATORS[python_type][1]
    except KeyError:
        raise ValueError("%s type is not dehydrateable" % python_type)

    return value_dehydrator(wet_value)