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
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# This module is derived from code from SQLAlchemy
#
# orm/collections.py
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
#
import logging
from vicn.core.sa_compat import py2k
from vicn.core.exception import VICNListException
log = logging.getLogger(__name__)
def _list_decorators():
"""Tailored instrumentation wrappers for any list-like class."""
def _tidy(fn):
fn._sa_instrumented = True
fn.__doc__ = getattr(list, fn.__name__).__doc__
def append(fn):
def append(self, item):
try:
item = self._attribute.do_list_add(self._instance, item)
fn(self, item)
except VICNListException as e:
pass
_tidy(append)
return append
def remove(fn):
def remove(self, value):
# testlib.pragma exempt:__eq__
try:
self._attribute.do_list_remove(self._instance, value)
fn(self, value)
except : pass
_tidy(remove)
return remove
def insert(fn):
def insert(self, index, value):
try:
value = self._attribute.do_list_add(self._instance, item)
fn(self, index, value)
except : pass
_tidy(insert)
return insert
def __getitem__(fn):
def __getitem__(self, index):
item = fn(self, index)
return self._attribute.handle_getitem(self._instance, item)
_tidy(__getitem__)
return __getitem__
def __setitem__(fn):
def __setitem__(self, index, value):
if not isinstance(index, slice):
existing = self[index]
if existing is not None:
try:
self._attribute.do_list_remove(self._instance, existing)
except: pass
try:
value = self._attribute.do_list_add(self._instance, value)
fn(self, index, value)
except: pass
else:
# slice assignment requires __delitem__, insert, __len__
step = index.step or 1
start = index.start or 0
if start < 0:
start += len(self)
if index.stop is not None:
stop = index.stop
else:
stop = len(self)
if stop < 0:
stop += len(self)
if step == 1:
for i in range(start, stop, step):
if len(self) > start:
del self[start]
for i, item in enumerate(value):
self.insert(i + start, item)
else:
rng = list(range(start, stop, step))
if len(value) != len(rng):
raise ValueError(
"attempt to assign sequence of size %s to "
"extended slice of size %s" % (len(value),
len(rng)))
for i, item in zip(rng, value):
self.__setitem__(i, item)
_tidy(__setitem__)
return __setitem__
def __delitem__(fn):
def __delitem__(self, index):
if not isinstance(index, slice):
item = self[index]
try:
self._attribute.do_list_remove(self._instance, item)
fn(self, index)
except : pass
else:
# slice deletion requires __getslice__ and a slice-groking
# __getitem__ for stepped deletion
# note: not breaking this into atomic dels
has_except = False
for item in self[index]:
try:
self._attribute.do_list_remove(self._instance, item)
except : has_except = True
if not has_except:
fn(self, index)
_tidy(__delitem__)
return __delitem__
if py2k:
def __setslice__(fn):
def __setslice__(self, start, end, values):
has_except = False
for value in self[start:end]:
try:
self._attribute.do_list_remove(self._instance, value)
except : has_except = True
#values = [self._attribute.do_list_add(self._instance, value) for value in values]
_values = list()
for value in values:
try:
_values.append(self._attribute.do_list_add(self._instance, value))
except: has_except = True
if not has_except:
fn(self, start, end, _values)
_tidy(__setslice__)
return __setslice__
def __delslice__(fn):
def __delslice__(self, start, end):
has_except = False
for value in self[start:end]:
try:
self._attribute.do_list_remove(self._instance, value)
except : has_except = True
if not has_except:
fn(self, start, end)
_tidy(__delslice__)
return __delslice__
def extend(fn):
def extend(self, iterable):
for value in iterable:
self.append(value)
_tidy(extend)
return extend
def __iadd__(fn):
def __iadd__(self, iterable):
# list.__iadd__ takes any iterable and seems to let TypeError
# raise as-is instead of returning NotImplemented
for value in iterable:
self.append(value)
return self
_tidy(__iadd__)
return __iadd__
def pop(fn):
def pop(self, index=-1):
try:
self._attribute.do_list_remove(self._instance, item)
item = fn(self, index)
return item
except : return None
_tidy(pop)
return pop
def __iter__(fn):
def __iter__(self):
for item in fn(self):
yield self._attribute.handle_getitem(self._instance, item)
_tidy(__iter__)
return __iter__
def __repr__(fn):
def __repr__(self):
return '<Collection {} {}>'.format(id(self), list.__repr__(self))
_tidy(__repr__)
return __repr__
__str__ = __repr__
#def __str__(fn):
# def __str__(self):
# return str(list(self))
# _tidy(__str__)
# return __str__
if not py2k:
def clear(fn):
def clear(self, index=-1):
has_except = False
for item in self:
try:
self._attribute.do_list_remove(self._instance, item)
except : has_except = True
if not has_except:
fn(self)
_tidy(clear)
return clear
# __imul__ : not wrapping this. all members of the collection are already
# present, so no need to fire appends... wrapping it with an explicit
# decorator is still possible, so events on *= can be had if they're
# desired. hard to imagine a use case for __imul__, though.
l = locals().copy()
l.pop('_tidy')
return l
def _instrument_list(cls):
# inspired by sqlalchemy
for method, decorator in _list_decorators().items():
fn = getattr(cls, method, None)
if fn:
#if (fn and method not in methods and
# not hasattr(fn, '_sa_instrumented')):
setattr(cls, method, decorator(fn))
class InstrumentedList(list):
def __contains__(self, key):
from vicn.core.resource import Resource
if isinstance(key, Resource):
key = key.get_uuid()
return list.__contains__(self, key)
def __lshift__(self, item):
self.append(item)
_instrument_list(InstrumentedList)
|
