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#!/usr/bin/env python
#
# _pyyaml_serializer.py
"""
ruamel.yaml-backed YAML serializer for :class:`~apeye.slumber_url.SlumberURL`.
.. versionadded:: 0.6.0
"""
#
# Copyright © 2020-2021 Dominic Davis-Foster <dominic@davis-foster.co.uk>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# Based on Slumber <https://slumber.readthedocs.io>
# Copyright (c) 2011 Donald Stufft
# Licensed under the 2-clause BSD License
#
# stdlib
from io import StringIO
from typing import Any, Mapping, MutableMapping
# 3rd party
import ruamel.yaml as yaml # type: ignore[import] # nodep
# this package
from apeye.slumber_url.serializers._abc import Serializer
__all__ = ["YamlSerializer"]
class YamlSerializer(Serializer):
"""
Serializer for YAML data.
.. versionchanged:: 0.6.0 Moved to :mod:`apeye.slumber_url.serializers`
.. attention::
Either `PyYaml <https://pypi.org/project/PyYAML/>`_ or
`ruamel.yaml <https://pypi.org/project/ruamel.yaml/>`_
must be installed to use this serializer.
"""
content_types = ["text/yaml"]
key = "yaml"
def __init__(self):
super().__init__()
self._yaml = yaml.YAML()
def loads(self, data: str) -> MutableMapping[str, Any]:
"""
Deserialize data using this :class:`~.Serializer`.
:param data:
"""
y = yaml.YAML(typ="safe", pure=True)
return y.load(str(data))
def dumps(self, data: Mapping[str, Any]) -> str:
"""
Serialize data using this :class:`~.Serializer`.
:param data:
"""
buf = StringIO()
self._yaml.dump(data, buf)
return buf.getvalue()
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