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
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
|
# Copyright 2008 The Tor Project, Inc. See LICENSE for licensing information.
import re
import sys
import thandy
class Schema:
def matches(self, obj):
try:
self.checkMatch(obj)
except thandy.FormatException:
return False
else:
return True
def checkMatch(self, obj):
raise NotImplemented()
class Any(Schema):
"""
>>> s = Any()
>>> s.matches("A String")
True
>>> s.matches([1, "list"])
True
"""
def checkMatch(self, obj):
pass
class RE(Schema):
"""
>>> s = RE("h.*d")
>>> s.matches("hello world")
True
>>> s.matches("Hello World")
False
>>> s.matches("hello world!")
False
>>> s.matches([33, "Hello"])
False
"""
def __init__(self, pat=None, modifiers=0, reObj=None, reName="pattern"):
if not reObj:
if not pat.endswith("$"):
pat += "$"
reObj = re.compile(pat, modifiers)
self._re = reObj
self._reName = reName
def checkMatch(self, obj):
if not isinstance(obj, basestring) or not self._re.match(obj):
raise thandy.FormatException("%r did not match %s"
%(obj,self._reName))
class Str(Schema):
"""
>>> s = Str("Hi")
>>> s.matches("Hi")
True
>>> s.matches("Not hi")
False
"""
def __init__(self, val):
self._str = val
def checkMatch(self, obj):
if self._str != obj:
raise thandy.FormatException("Expected %r; got %r"%(self._str, obj))
class AnyStr(Schema):
"""
>>> s = AnyStr()
>>> s.matches("")
True
>>> s.matches("a string")
True
>>> s.matches(["a"])
False
>>> s.matches(3)
False
>>> s.matches(u"a unicode string")
True
>>> s.matches({})
False
"""
def __init__(self):
pass
def checkMatch(self, obj):
if not isinstance(obj, basestring):
raise thandy.FormatException("Expected a string; got %r"%obj)
class ListOf(Schema):
"""
>>> s = ListOf(RE("(?:..)*"))
>>> s.matches("hi")
False
>>> s.matches([])
True
>>> s.matches({})
False
>>> s.matches(["Hi", "this", "list", "is", "full", "of", "even", "strs"])
True
>>> s.matches(["This", "one", "is not"])
False
"""
def __init__(self, schema, minCount=0, maxCount=sys.maxint,listName="list"):
self._schema = schema
self._minCount = minCount
self._maxCount = maxCount
self._listName = listName
def checkMatch(self, obj):
if not isinstance(obj, (list, tuple)):
raise thandy.FormatException("Expected %s; got %r"
%(self._listName,obj))
for item in obj:
try:
self._schema.checkMatch(item)
except thandy.FormatException, e:
raise thandy.FormatException("%s in %s"%(e, self._listName))
if not (self._minCount <= len(obj) <= self._maxCount):
raise thandy.FormatException("Length of %s out of range"
%self._listName)
class Struct(Schema):
"""
>>> s = Struct([ListOf(AnyStr()), AnyStr(), Str("X")])
>>> s.matches(False)
False
>>> s.matches("Foo")
False
>>> s.matches([[], "Q", "X"])
True
>>> s.matches([[], "Q", "D"])
False
>>> s.matches([[3], "Q", "X"])
False
>>> s.matches([[], "Q", "X", "Y"])
False
"""
def __init__(self, subschemas, allowMore=False, structName="list"):
self._subschemas = subschemas[:]
self._allowMore = allowMore
self._structName = structName
def checkMatch(self, obj):
if not isinstance(obj, (list, tuple)):
raise thandy.FormatException("Expected %s; got %r"
%(self._structName,obj))
elif len(obj) < len(self._subschemas):
raise thandy.FormatException(
"Too few fields in %s"%self._structName)
elif len(obj) > len(self._subschemas) and not self._allowMore:
raise thandy.FormatException(
"Too many fields in %s"%self._structName)
for item, schema in zip(obj, self._subschemas):
schema.checkMatch(item)
class DictOf(Schema):
"""
>>> s = DictOf(RE(r'[aeiou]+'), Struct([AnyStr(), AnyStr()]))
>>> s.matches("")
False
>>> s.matches({})
True
>>> s.matches({"a": ["x", "y"], "e" : ["", ""]})
True
>>> s.matches({"a": ["x", 3], "e" : ["", ""]})
False
>>> s.matches({"a": ["x", "y"], "e" : ["", ""], "d" : ["a", "b"]})
False
"""
def __init__(self, keySchema, valSchema):
self._keySchema = keySchema
self._valSchema = valSchema
def checkMatch(self, obj):
try:
iter = obj.iteritems()
except AttributeError:
raise thandy.FormatException("Expected a dict; got %r"%obj)
for k,v in iter:
self._keySchema.checkMatch(k)
self._valSchema.checkMatch(v)
class Opt:
"""Helper; applied to a value in Obj to mark it optional.
>>> s = Obj(k1=Str("X"), k2=Opt(Str("Y")))
>>> s.matches({'k1': "X", 'k2': "Y"})
True
>>> s.matches({'k1': "X", 'k2': "Z"})
False
>>> s.matches({'k1': "X"})
True
"""
def __init__(self, schema):
self._schema = schema
def checkMatch(self, obj):
self._schema.checkMatch(obj)
class Obj(Schema):
"""
>>> s = Obj(a=AnyStr(), bc=Struct([Int(), Int()]))
>>> s.matches({'a':"ZYYY", 'bc':[5,9]})
True
>>> s.matches({'a':"ZYYY", 'bc':[5,9], 'xx':5})
True
>>> s.matches({'a':"ZYYY", 'bc':[5,9,3]})
False
>>> s.matches({'a':"ZYYY"})
False
"""
def __init__(self, _objname="object", **d):
self._objname = _objname
self._required = d.items()
def checkMatch(self, obj):
for k,schema in self._required:
try:
item = obj[k]
except KeyError:
if not isinstance(schema, Opt):
raise thandy.FormatException("Missing key %s in %s"
%(k,self._objname))
else:
try:
schema.checkMatch(item)
except thandy.FormatException, e:
raise thandy.FormatException("%s in %s.%s"
%(e,self._objname,k))
class Int(Schema):
"""
>>> s = Int()
>>> s.matches(99)
True
>>> s.matches(False)
False
>>> s.matches(0L)
True
>>> s.matches("a string")
False
>>> Int(lo=10, hi=30).matches(25)
True
>>> Int(lo=10, hi=30).matches(5)
False
"""
def __init__(self, lo=-sys.maxint, hi=sys.maxint):
self._lo = lo
self._hi = hi
def checkMatch(self, obj):
if isinstance(obj, bool) or not isinstance(obj, (int, long)):
# We need to check for bool as a special case, since bool
# is for historical reasons a subtype of int.
raise thandy.FormatException("Got %r instead of an integer"%obj)
elif not (self._lo <= obj <= self._hi):
raise thandy.FormatException("%r not in range [%r,%r]"
%(obj, self._lo, self._hi))
class Bool(Schema):
"""
>>> s = Bool()
>>> s.matches(True) and s.matches(False)
True
>>> s.matches(11)
False
"""
def __init__(self):
pass
def checkMatch(self, obj):
if not isinstance(obj, bool):
raise thandy.FormatException("Got %r instead of a boolean"%obj)
|
