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
|
"""
SAX driver for the Pyexpat C module. This driver works with
pyexpat.__version__ == '2.22'.
"""
version = "0.20"
from xml.sax._exceptions import *
from xml.parsers import expat
from xml.sax import xmlreader, saxutils, handler
AttributesImpl = xmlreader.AttributesImpl
AttributesNSImpl = xmlreader.AttributesNSImpl
import string
# --- ExpatParser
class ExpatParser(xmlreader.IncrementalParser, xmlreader.Locator):
"SAX driver for the Pyexpat C module."
def __init__(self, namespaceHandling=0, bufsize=2**16-20):
xmlreader.IncrementalParser.__init__(self, bufsize)
self._source = xmlreader.InputSource()
self._parser = None
self._namespaces = namespaceHandling
self._parsing = 0
self._entity_stack = []
# XMLReader methods
def parse(self, source):
"Parse an XML document from a URL or an InputSource."
source = saxutils.prepare_input_source(source)
self._source = source
self.reset()
self._cont_handler.setDocumentLocator(self)
try:
xmlreader.IncrementalParser.parse(self, source)
except expat.error:
error_code = self._parser.ErrorCode
raise SAXParseException(expat.ErrorString(error_code), None, self)
self._cont_handler.endDocument()
def prepareParser(self, source):
if source.getSystemId() != None:
self._parser.SetBase(source.getSystemId())
def getFeature(self, name):
if name == handler.feature_namespaces:
return self._namespaces
raise SAXNotRecognizedException("Feature '%s' not recognized" % name)
def setFeature(self, name, state):
if self._parsing:
raise SAXNotSupportedException("Cannot set features while parsing")
if name == handler.feature_namespaces:
self._namespaces = state
else:
raise SAXNotRecognizedException("Feature '%s' not recognized" %
name)
def getProperty(self, name):
raise SAXNotRecognizedException("Property '%s' not recognized" % name)
def setProperty(self, name, value):
raise SAXNotRecognizedException("Property '%s' not recognized" % name)
# IncrementalParser methods
def feed(self, data):
if not self._parsing:
self._parsing = 1
self.reset()
self._cont_handler.startDocument()
if not self._parser.Parse(data, 0):
msg = pyexpat.ErrorString(self._parser.ErrorCode)
raise SAXParseException(msg, None, self)
def close(self):
if self._parsing:
self._cont_handler.endDocument()
self._parsing = 0
self._parser.Parse("", 1)
def reset(self):
if self._namespaces:
self._parser = expat.ParserCreate(None, " ")
self._parser.StartElementHandler = self.start_element_ns
self._parser.EndElementHandler = self.end_element_ns
else:
self._parser = expat.ParserCreate()
self._parser.StartElementHandler = self.start_element
self._parser.EndElementHandler = self.end_element
self._parser.ProcessingInstructionHandler = \
self._cont_handler.processingInstruction
self._parser.CharacterDataHandler = self._cont_handler.characters
self._parser.UnparsedEntityDeclHandler = self.unparsed_entity_decl
self._parser.NotationDeclHandler = self.notation_decl
self._parser.StartNamespaceDeclHandler = self.start_namespace_decl
self._parser.EndNamespaceDeclHandler = self.end_namespace_decl
# self._parser.CommentHandler =
# self._parser.StartCdataSectionHandler =
# self._parser.EndCdataSectionHandler =
# self._parser.DefaultHandler =
# self._parser.DefaultHandlerExpand =
# self._parser.NotStandaloneHandler =
self._parser.ExternalEntityRefHandler = self.external_entity_ref
self._entity_stack = []
# Locator methods
def getColumnNumber(self):
return self._parser.ErrorColumnNumber
def getLineNumber(self):
return self._parser.ErrorLineNumber
def getPublicId(self):
return self._source.getPublicId()
def getSystemId(self):
return self._parser.GetBase()
# event handlers
def start_element(self, name, attrs):
self._cont_handler.startElement(name, AttributesImpl(attrs))
def end_element(self, name):
self._cont_handler.endElement(name)
def start_element_ns(self, name, attrs):
pair = string.split(name)
if len(pair) == 1:
pair = (None, name)
newattrs = {}
for (aname, value) in attrs.items():
apair = string.split(aname)
if len(apair) == 1:
apair = (None, aname)
else:
apair = tuple(apair)
newattrs[apair] = value
self._cont_handler.startElementNS(pair, None,
AttributesNSImpl(newattrs, {}))
def end_element_ns(self, name):
pair = string.split(name)
if len(pair) == 1:
pair = (None, name)
self._cont_handler.endElementNS(pair, None)
# this is not used (call directly to ContentHandler)
def processing_instruction(self, target, data):
self._cont_handler.processingInstruction(target, data)
# this is not used (call directly to ContentHandler)
def character_data(self, data):
self._cont_handler.characters(data)
def start_namespace_decl(self, prefix, uri):
self._cont_handler.startPrefixMapping(prefix, uri)
def end_namespace_decl(self, prefix):
self._cont_handler.endPrefixMapping(prefix)
def unparsed_entity_decl(self, name, base, sysid, pubid, notation_name):
self._dtd_handler.unparsedEntityDecl(name, pubid, sysid, notation_name)
def notation_decl(self, name, base, sysid, pubid):
self._dtd_handler.notationDecl(name, pubid, sysid)
def external_entity_ref(self, context, base, sysid, pubid):
source = self._ent_handler.resolveEntity(pubid, sysid)
source = saxutils.prepare_input_source(source,
self._source.getSystemId() or
"")
self._entity_stack.append((self._parser, self._source))
self._parser = self._parser.ExternalEntityParserCreate(context)
self._source = source
try:
xmlreader.IncrementalParser.parse(self, source)
self.close()
except:
return 0 # FIXME: save error info here?
(self._parser, self._source) = self._entity_stack[-1]
del self._entity_stack[-1]
return 1
# ---
def create_parser(*args, **kwargs):
return apply(ExpatParser, args, kwargs)
# ---
if __name__ == "__main__":
import xml.sax
p = create_parser()
p.setContentHandler(xml.sax.XMLGenerator())
p.setErrorHandler(xml.sax.ErrorHandler())
p.parse("../../../hamlet.xml")
|
