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
|
# Copyright (c) 2010 Mark Sandstrom
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
from declarations import OrderedDeclaration, SubFactory
ATTR_SPLITTER = '__'
class ObjectParamsWrapper(object):
"""A generic container that allows for getting but not setting of attributes.
Attributes are set at initialization time."""
initialized = False
def __init__(self, attrs):
self.attrs = attrs
self.initialized = True
def __setattr__(self, name, value):
if not self.initialized:
return super(ObjectParamsWrapper, self).__setattr__(name, value)
else:
raise AttributeError('Setting of object attributes is not allowed')
def __getattr__(self, name):
try:
return self.attrs[name]
except KeyError:
raise AttributeError("The param '{0}' does not exist. Perhaps your declarations are out of order?".format(name))
class OrderedDeclarationDict(object):
def __init__(self, **kwargs):
self._order = {}
self._values = {}
for k, v in kwargs.iteritems():
self[k] = v
def __contains__(self, key):
return key in self._values
def __getitem__(self, key):
return self._values[key]
def __setitem__(self, key, val):
if key in self:
del self[key]
self._values[key] = val
self._order[val.order] = key
def __delitem__(self, key):
self.pop(key)
def pop(self, key):
val = self._values.pop(key)
del self._order[val.order]
return val
def items(self):
return list(self.iteritems())
def iteritems(self):
order = sorted(self._order.keys())
for i in order:
key = self._order[i]
yield (key, self._values[key])
def __iter__(self):
order = sorted(self._order.keys())
for i in order:
yield self._order[i]
class DeclarationsHolder(object):
"""Holds all declarations, ordered and unordered."""
def __init__(self, defaults=None):
if not defaults:
defaults = {}
self._ordered = OrderedDeclarationDict()
self._unordered = {}
self.update_base(defaults)
def update_base(self, attrs):
"""Updates the DeclarationsHolder from a class definition.
Takes into account all public attributes and OrderedDeclaration
instances; ignores all attributes starting with '_'.
Returns a dict containing all remaining elements.
"""
remaining = {}
for key, value in attrs.iteritems():
if isinstance(value, OrderedDeclaration):
self._ordered[key] = value
elif not key.startswith('_'):
self._unordered[key] = value
else:
remaining[key] = value
return remaining
def __contains__(self, key):
return key in self._ordered or key in self._unordered
def __getitem__(self, key):
try:
return self._unordered[key]
except KeyError:
return self._ordered[key]
def iteritems(self):
for pair in self._unordered.iteritems():
yield pair
for pair in self._ordered.iteritems():
yield pair
def items(self):
return list(self.iteritems())
def build_attributes(self, factory, create=False, extra=None):
"""Build the list of attributes based on class attributes."""
if not extra:
extra = {}
factory.sequence = factory._generate_next_sequence()
attributes = {}
sub_fields = {}
for key in list(extra.keys()):
if ATTR_SPLITTER in key:
cls_name, attr_name = key.split(ATTR_SPLITTER, 1)
if cls_name in self:
sub_fields.setdefault(cls_name, {})[attr_name] = extra.pop(key)
# For fields in _unordered, use the value from extra if any; otherwise,
# use the default value.
for key, value in self._unordered.iteritems():
attributes[key] = extra.get(key, value)
for key, value in self._ordered.iteritems():
if key in extra:
attributes[key] = extra[key]
else:
if isinstance(value, SubFactory):
new_value = value.evaluate(factory, create,
sub_fields.get(key, {}))
else:
wrapper = ObjectParamsWrapper(attributes)
new_value = value.evaluate(factory, wrapper)
attributes[key] = new_value
attributes.update(extra)
return attributes
class StubObject(object):
"""A generic container."""
pass
|