#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2023 Satpy developers
#
# This file is part of satpy.
#
# satpy is free software: you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# satpy 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# satpy. If not, see <http://www.gnu.org/licenses/>.
"""CF decoding."""
import copy
import json
from datetime import datetime
[docs]
def decode_attrs(attrs):
"""Decode CF-encoded attributes to Python object.
Converts timestamps to datetime and strings starting with "{" to
dictionary.
Args:
attrs (dict): Attributes to be decoded
Returns (dict): Decoded attributes
"""
attrs = copy.deepcopy(attrs)
_decode_dict_type_attrs(attrs)
_decode_timestamps(attrs)
return attrs
[docs]
def _decode_dict_type_attrs(attrs):
for key, val in attrs.items():
attrs[key] = _str2dict(val)
[docs]
def _str2dict(val):
"""Convert string to dictionary."""
if isinstance(val, str) and val.startswith("{"):
val = json.loads(val, object_hook=_datetime_parser_json)
return val
[docs]
def _decode_timestamps(attrs):
for key, value in attrs.items():
timestamp = _str2datetime(value)
if timestamp:
attrs[key] = timestamp
[docs]
def _datetime_parser_json(json_dict):
"""Traverse JSON dictionary and parse timestamps."""
for key, value in json_dict.items():
timestamp = _str2datetime(value)
if timestamp:
json_dict[key] = timestamp
return json_dict
[docs]
def _str2datetime(string):
"""Convert string to datetime object."""
try:
return datetime.fromisoformat(string)
except (TypeError, ValueError):
return None