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
|
# xml.marshal : Marshals simple Python data types into an XML-based
# format. The interface is the same as the built-in module of the
# same name, with four functions:
# dump(value, file), load(file)
# dumps(value), loads(string)
from types import *
import string
__dtd__ = """
<!ELEMENT marshal (integer | string | float | long | complex | code | none
| tuple | list | dictionary)>
<!ELEMENT none EMPTY>
<!ELEMENT reference EMPTY>
<!ELEMENT integer (#PCDATA)>
<!ELEMENT string (#PCDATA)>
<!ELEMENT float (#PCDATA)>
<!ELEMENT long (#PCDATA)>
<!ELEMENT code (#PCDATA)>
<!ELEMENT complex (float, float)>
<!ELEMENT tuple (integer | string | float | long | complex | code | none
| tuple | list | dictionary | reference)*>
<!ELEMENT list (integer | string | float | long | complex | code | none
| tuple | list | dictionary | reference)*>
<!ELEMENT dictionary (
(integer | string | long | float | complex | code | tuple | reference ),
(integer | string | float | long | complex | code | none
| tuple | list | dictionary | reference) )* >
<!ATTLIST list id ID #REQUIRED>
<!ATTLIST dictionary id ID #REQUIRED>
<!ATTLIST reference id IDREF #REQUIRED>
"""
# Dictionary mapping some of the simple types to the corresponding tag
_mapping = {StringType:'string', IntType:'integer',
FloatType:'float'}
# XML version and DOCTYPE declaration
PROLOGUE = """<?xml version="1.0"?>
<!DOCTYPE marshal SYSTEM "marshal.dtd">
"""
def _marshal(value, dict):
L = []
t = type(value) ; i = str( id(value) )
if dict.has_key( i ):
# This object has already been marshalled, so
# emit a reference element.
L.append( '<reference id="i%s"/>' % (i, ) )
elif _mapping.has_key( t ):
# Some simple type: integer, string, or float
name = _mapping[t]
L.append( '<'+name + '>')
s = str(value)
if '&' in s or '>' in s or '<' in s:
s = string.replace(s, '&', '&')
s = string.replace(s, '<', '<')
s = string.replace(s, '>', '>')
L.append( s )
L.append( '</' + name + '>')
elif t == LongType:
L.append('<long>%s</long>' % (str(value)[:-1],) )
elif t == TupleType:
L.append( '<tuple>')
for elem in value:
L = L + _marshal(elem, dict)
L.append( '</tuple>')
elif t == ListType:
dict[ i ] = 1
L.append( '<list id="i%s">' %(i,) )
for elem in value:
L = L + _marshal(elem, dict)
L.append( '</list>')
elif t == DictType:
dict[ i ] = 1
L.append( '<dictionary id="i%s">' %(i,) )
for key, v in value.items():
L = L + _marshal(key, dict)
L = L + _marshal(v, dict)
L.append( '</dictionary>')
elif t == NoneType:
L.append( '<none/>')
elif t == ComplexType:
# XXX should it be <complex><real>...</real><imag>...</imag></complex>?
L.append( '<complex><float>' )
L.append( str(value.real) )
L.append( '</float><float>' )
L.append( str(value.imag) )
L.append( '</float>' )
L.append( '</complex>' )
elif t == CodeType:
# The full information about code objects is only available
# from the C level, so we'll use the built-in marshal module
# to convert the code object into a string, and include it in
# the HTML.
import marshal, base64
L.append( '<code>' )
s = marshal.dumps(value)
s = base64.encodestring(s)
L.append( s )
L.append( '</code>' )
dict[ i ] = 'code'
return L
from xml.sax import saxlib
DICT = 'dict' ; LIST = 'list' ; TUPLE='tuple'
class _unmarshalHandler(saxlib.HandlerBase):
def __init__(self):
saxlib.HandlerBase.__init__(self)
def startElement(self, name, attrs):
if name == 'marshal':
self.dict = {}
self.data_stack = []
return
elif name == 'reference':
assert attrs.has_key('id')
id = attrs['id']
assert self.dict.has_key(id)
self.data_stack.append( self.dict[id] )
if name=='dictionary':
self.data_stack.append(DICT)
d = {}
id = attrs[ 'id']
self.dict[ id ] = d
self.data_stack.append( d )
elif name=='list':
self.data_stack.append(LIST)
L = []
id = attrs[ 'id']
self.dict[ id ] = L
self.data_stack.append( L )
elif name=='tuple':
self.data_stack.append(TUPLE)
else:
self.data_stack.append( [] )
def characters(self, ch, start, length):
self.data_stack[-1].append(ch[start:start+length])
def endElement(self, name):
ds = self.data_stack
if name == 'string':
ds[-1] = string.join(ds[-1], "")
elif name == 'integer':
ds[-1] = string.join(ds[-1], "")
ds[-1] = string.atoi( ds[-1] )
elif name == 'long':
ds[-1] = string.join(ds[-1], "")
ds[-1] = string.atol( ds[-1] )
elif name == 'float':
ds[-1] = string.join(ds[-1], "")
ds[-1] = string.atof( ds[-1] )
elif name == 'none':
ds[-1] = None
elif name == 'complex':
c = ds[-2] + ds[-1]*1j
ds[-3:] = [c]
elif name == 'code':
import marshal, base64
s = string.join(ds[-1], "")
s = base64.decodestring( s )
ds[-1] = marshal.loads(s)
elif name == 'dictionary':
for index in range(len(ds)-1, -1, -1):
if ds[index] is DICT: break
assert index!=-1
d = ds[index+1]
for i in range(index+2, len(ds), 2):
key = ds[i] ; value =ds[i+1]
d[key] = value
ds[index:] = [ d ]
elif name == 'list':
for index in range(len(ds)-1, -1, -1):
if ds[index] is LIST: break
assert index!=-1
L = ds[index+1]
L[:] = ds[index+2 : len(ds)]
ds[index:] = [ L ]
elif name == 'tuple':
for index in range(len(ds)-1, -1, -1):
if ds[index] is TUPLE: break
assert index!=-1
t = tuple( ds[index+1 : len(ds)] )
ds[index:] = [ t ]
def dump(value, file):
"Write the value on the open file"
L = _marshal(value, {} )
L = [PROLOGUE + '<marshal>'] + L + ['</marshal>']
file.write( string.join(L, "") )
def load(file):
"Read one value from the open file"
h = _unmarshalHandler()
from xml.sax import saxexts
p=saxexts.make_parser()
p.setDocumentHandler(h)
p.parseFile(file)
return h.data_stack[0]
def dumps(value):
"Marshal value, returning the resulting string"
L = _marshal(value, {} )
L = [PROLOGUE + '<marshal>'] + L + ['</marshal>']
return string.join(L, "")
def loads(string):
"Read one value from the string"
import StringIO
file = StringIO.StringIO(string)
return load(file)
if __name__ == '__main__':
print "Testing XML marshalling..."
L=[None, 1, pow(2,123L), 19.72, 1+5j,
"here is a string & a <fake tag> ",
(1,2,3),
['alpha', 'beta', 'gamma'],
{'key':'value', 1:2},
dumps.func_code ]
# Try all the above bits of data
import StringIO
for item in L + [ L ]:
s = dumps(item)
print s
output = loads(s)
# Try it from a file
file = StringIO.StringIO()
dump(item, file)
file.seek(0)
output2 = load(file)
print repr(item)
assert item==output and item==output2 and output==output2
recursive_list = [None, 1, pow(3,65L), '<fake tag>', 1+5j]
recursive_list.append( recursive_list )
s = dumps(recursive_list)
print s
output = loads(s)
print repr(output)
|
