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# ==================================================================================================================== #
# _____ _ _ ____ __ _ _ _ #
# _ __ _ |_ _|__ ___ | (_)_ __ __ _ / ___|___ _ __ / _(_) __ _ _ _ _ __ __ _| |_(_) ___ _ __ #
# | '_ \| | | || |/ _ \ / _ \| | | '_ \ / _` || | / _ \| '_ \| |_| |/ _` | | | | '__/ _` | __| |/ _ \| '_ \ #
# | |_) | |_| || | (_) | (_) | | | | | | (_| || |__| (_) | | | | _| | (_| | |_| | | | (_| | |_| | (_) | | | | #
# | .__/ \__, ||_|\___/ \___/|_|_|_| |_|\__, (_)____\___/|_| |_|_| |_|\__, |\__,_|_| \__,_|\__|_|\___/|_| |_| #
# |_| |___/ |___/ |___/ #
# ==================================================================================================================== #
# Authors: #
# Patrick Lehmann #
# #
# License: #
# ==================================================================================================================== #
# Copyright 2021-2024 Patrick Lehmann - Bötzingen, Germany #
# #
# Licensed under the Apache License, Version 2.0 (the "License"); #
# you may not use this file except in compliance with the License. #
# You may obtain a copy of the License at #
# #
# http://www.apache.org/licenses/LICENSE-2.0 #
# #
# Unless required by applicable law or agreed to in writing, software #
# distributed under the License is distributed on an "AS IS" BASIS, #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. #
# See the License for the specific language governing permissions and #
# limitations under the License. #
# #
# SPDX-License-Identifier: Apache-2.0 #
# ==================================================================================================================== #
#
"""\
Abstract configuration reader.
.. hint:: See :ref:`high-level help <CONFIG>` for explanations and usage examples.
"""
from pathlib import Path
from typing import Union, ClassVar, Iterator, Type, Optional as Nullable
try:
from pyTooling.Decorators import export, readonly
from pyTooling.MetaClasses import ExtendedType, mixin
from pyTooling.Exceptions import ToolingException
except (ImportError, ModuleNotFoundError): # pragma: no cover
print("[pyTooling.Configuration] Could not import from 'pyTooling.*'!")
try:
from Decorators import export, readonly
from MetaClasses import ExtendedType, mixin
from Exceptions import ToolingException
except (ImportError, ModuleNotFoundError) as ex: # pragma: no cover
print("[pyTooling.Configuration] Could not import directly!")
raise ex
KeyT = Union[str, int]
NodeT = Union["Dictionary", "Sequence"]
ValueT = Union[NodeT, str, int, float]
@export
class ConfigurationException(ToolingException):
pass
@export
class Node(metaclass=ExtendedType, slots=True):
"""Abstract node in a configuration data structure."""
DICT_TYPE: ClassVar[Type["Dictionary"]] #: Type reference used when instantiating new dictionaries
SEQ_TYPE: ClassVar[Type["Sequence"]] #: Type reference used when instantiating new sequences
_root: "Configuration" #: Reference to the root node.
_parent: "Dictionary" #: Reference to a parent node.
def __init__(self, root: "Configuration" = None, parent: Nullable[NodeT] = None) -> None:
"""
Initializes a node.
:param root: Reference to the root node.
:param parent: Reference to the parent node.
"""
self._root = root
self._parent = parent
def __len__(self) -> int: # type: ignore[empty-body]
"""
Returns the number of sub-elements.
:returns: Number of sub-elements.
"""
def __getitem__(self, key: KeyT) -> ValueT: # type: ignore[empty-body]
raise NotImplementedError()
def __setitem__(self, key: KeyT, value: ValueT) -> None: # type: ignore[empty-body]
raise NotImplementedError()
def __iter__(self) -> Iterator[ValueT]: # type: ignore[empty-body]
raise NotImplementedError()
@property
def Key(self) -> KeyT:
raise NotImplementedError()
@Key.setter
def Key(self, value: KeyT):
raise NotImplementedError()
def QueryPath(self, query: str) -> ValueT: # type: ignore[empty-body]
raise NotImplementedError()
@export
@mixin
class Dictionary(Node):
"""Abstract dictionary node in a configuration."""
def __init__(self, root: "Configuration" = None, parent: Nullable[NodeT] = None) -> None:
"""
Initializes a dictionary.
:param root: Reference to the root node.
:param parent: Reference to the parent node.
"""
Node.__init__(self, root, parent)
def __contains__(self, key: KeyT) -> bool: # type: ignore[empty-body]
raise NotImplementedError()
@export
@mixin
class Sequence(Node):
"""Abstract sequence node in a configuration."""
def __init__(self, root: "Configuration" = None, parent: Nullable[NodeT] = None) -> None:
"""
Initializes a sequence.
:param root: Reference to the root node.
:param parent: Reference to the parent node.
"""
Node.__init__(self, root, parent)
def __getitem__(self, index: int) -> ValueT: # type: ignore[empty-body]
raise NotImplementedError()
def __setitem__(self, index: int, value: ValueT) -> None: # type: ignore[empty-body]
raise NotImplementedError()
setattr(Node, "DICT_TYPE", Dictionary)
setattr(Node, "SEQ_TYPE", Sequence)
@export
@mixin
class Configuration(Node):
"""Abstract root node in a configuration."""
_configFile: Path
def __init__(self, configFile: Path, root: "Configuration" = None, parent: Nullable[NodeT] = None) -> None:
"""
Initializes a configuration.
:param configFile: Configuration file.
:param root: Reference to the root node.
:param parent: Reference to the parent node.
"""
Node.__init__(self, root, parent)
self._configFile = configFile
@readonly
def ConfigFile(self) -> Path:
return self._configFile
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