1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
# -*- 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."""
from efilter import dispatch
from efilter import protocol
# Declarations:
# pylint: disable=unused-argument
@dispatch.multimethod
def resolve(structured, key):
raise NotImplementedError()
def getmembers(structured):
if isinstance(structured, type):
return getmembers_static(structured)
return getmembers_runtime(structured)
@dispatch.class_multimethod
def getmembers_static(structured_cls):
raise NotImplementedError()
@dispatch.multimethod
def getmembers_runtime(structured):
return getmembers_static(type(structured))
def reflect(structured, name):
if isinstance(structured, type):
return reflect_static_member(structured, name)
return reflect_runtime_member(structured, name)
@dispatch.class_multimethod
def reflect_static_member(structured_cls, name):
"""Provide the type of 'name' which is a member of 'structured_cls'.
Arguments:
associative_cls: The type of the structured object (like a dict).
name: The name to be reflected. Must be a member of 'structured_cls'.
Returns:
The type of 'name' or None. Invalid names should return None,
whereas valid names with unknown type should return AnyType.
"""
raise NotImplementedError()
@dispatch.multimethod
def reflect_runtime_member(structured, name):
return reflect_static_member(type(structured), name)
class IStructured(protocol.Protocol):
_required_functions = (resolve,)
_optional_functions = (reflect_runtime_member, reflect_static_member,
getmembers_static, getmembers_runtime)
# Lets us pretend that dicts are objects, which makes it easy for users to
# declare variables.
IStructured.implement(for_type=dict,
implementations={
resolve: lambda d, m: d[m],
getmembers_runtime: lambda d: d.keys()})
|
