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"""
PRIVATE MODULE: do not import (from) it directly.
This module contains the implementation of ``fork()``.
"""
from typing import Type, Optional
from jsons._common_impl import StateHolder, get_class_name, T
def fork(
fork_inst: Type[T] = StateHolder,
name: Optional[str] = None) -> Type[T]:
"""
Fork from the given ``StateHolder`` to create a separate "branch" of
serializers and deserializers.
:param fork_inst: The ``StateHolder`` on which the new fork is based.
:param name: The ``__name__`` of the new ``type``.
:return: A "fork inst" that can be used to separately store
(de)serializers from the regular ``StateHolder``.
"""
fork_inst._fork_counter += 1
if name:
class_name = name
else:
class_name = '{}_fork{}'.format(
get_class_name(fork_inst),
fork_inst._fork_counter
)
result = type(class_name, (fork_inst,), {})
result._classes_serializers = fork_inst._classes_serializers.copy()
result._classes_deserializers = fork_inst._classes_deserializers.copy()
result._serializers = fork_inst._serializers.copy()
result._deserializers = fork_inst._deserializers.copy()
result._fork_counter = 0
result._suppress_warnings = fork_inst._suppress_warnings
result._suppressed_warnings = fork_inst._suppressed_warnings.copy()
return result