#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2015-2020 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/>.
"""Utilities for dealing with ancillary variables."""
from .dataid import DataID, default_id_keys_config
[docs]def dataset_walker(datasets):
"""Walk through *datasets* and their ancillary data.
Yields datasets and their parent.
"""
for dataset in datasets:
yield dataset, None
for anc_ds in dataset.attrs.get('ancillary_variables', []):
try:
anc_ds.attrs
yield anc_ds, dataset
except AttributeError:
continue
[docs]def replace_anc(dataset, parent_dataset):
"""Replace *dataset* the *parent_dataset*'s `ancillary_variables` field."""
if parent_dataset is None:
return
id_keys = parent_dataset.attrs.get(
'_satpy_id_keys',
dataset.attrs.get(
'_satpy_id_keys',
default_id_keys_config))
current_dataid = DataID(id_keys, **dataset.attrs)
for idx, ds in enumerate(parent_dataset.attrs['ancillary_variables']):
if current_dataid == DataID(id_keys, **ds.attrs):
parent_dataset.attrs['ancillary_variables'][idx] = dataset
return