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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
import os
import pathlib
from types import MappingProxyType
from .transformer import get_transformers
class Constant:
"""A singleton class to store all constants."""
__instance = None
def __new__(cls, *args, **kw):
if cls.__instance is None:
cls.__instance = object.__new__(cls, *args, **kw)
return cls.__instance
def __init__(self):
self.__here = pathlib.Path(os.path.dirname(os.path.abspath(__file__)))
self.__predefined_transformers = get_transformers(self.__here / "transforms")
@property
def predefined_transformers(self):
return MappingProxyType(self.__predefined_transformers).copy()
@property
def here(self):
return self.__here