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# -*- coding: utf-8 -*-
# EFILTER Forensic Query Language
#
# Copyright 2015 Google Inc. All Rights Reserved.
#
# 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.
"""EFILTER abstract type system."""
import six
from efilter import dispatch
from efilter import protocol
# Declarations:
# pylint: disable=unused-argument
def ordered(collection, key_func=None):
if callable(key_func):
def key_for_sorted(x):
return assortkey(key_func(x))
else:
key_for_sorted = assortkey
return sorted(collection, key=key_for_sorted)
@dispatch.multimethod
def assortkey(x):
raise NotImplementedError()
class IOrdered(protocol.Protocol):
_required_functions = (assortkey,)
# Default implementations:
IOrdered.implement(
for_type=protocol.AnyType,
implementations={
assortkey: lambda x: x
}
)
IOrdered.implement(
for_type=dict,
implementations={
assortkey: lambda x: ordered(six.iteritems(x))
}
)
IOrdered.implement(
for_type=type(None),
implementations={
assortkey: lambda _: 0
}
)
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