Mercurial > traipse_dev

annotate orpg/pulldom.py @ 0:4385a7d0efd1 grumpy-goblin

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Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
author sirebral
date Tue, 14 Jul 2009 16:41:58 -0500
parents
children 551cd440acce
rev   line source
0
4385a7d0efd1 Deleted and repushed it with the 'grumpy-goblin' branch. I forgot a y
sirebral
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diff changeset
1 import minidom
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2 import xml.sax,xml.sax.handler
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3 import types
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4
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5 try:
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6 from cStringIO import StringIO
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7 except ImportError:
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8 from StringIO import StringIO
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9
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10 try:
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11 _StringTypes = [types.StringType, types.UnicodeType]
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12 except AttributeError:
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13 _StringTypes = [types.StringType]
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14
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15 START_ELEMENT = "START_ELEMENT"
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16 END_ELEMENT = "END_ELEMENT"
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17 COMMENT = "COMMENT"
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18 START_DOCUMENT = "START_DOCUMENT"
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19 END_DOCUMENT = "END_DOCUMENT"
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20 PROCESSING_INSTRUCTION = "PROCESSING_INSTRUCTION"
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21 IGNORABLE_WHITESPACE = "IGNORABLE_WHITESPACE"
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22 CHARACTERS = "CHARACTERS"
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23
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24 class PullDOM(xml.sax.ContentHandler):
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25 def __init__(self):
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26 self.firstEvent = [None, None]
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27 self.lastEvent = self.firstEvent
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28 self._ns_contexts = [{}] # contains uri -> prefix dicts
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29 self._current_context = self._ns_contexts[-1]
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30
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31 def setDocumentLocator(self, locator): pass
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32
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33 def startPrefixMapping(self, prefix, uri):
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34 self._ns_contexts.append(self._current_context.copy())
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35 self._current_context[uri] = prefix
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36
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37 def endPrefixMapping(self, prefix):
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38 del self._ns_contexts[-1]
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39
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40 def startElementNS(self, name, tagName , attrs):
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41 uri,localname = name
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42 if uri:
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43 # When using namespaces, the reader may or may not
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44 # provide us with the original name. If not, create
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45 # *a* valid tagName from the current context.
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46 if tagName is None:
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47 tagName = self._current_context[uri] + ":" + localname
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48 node = self.document.createElementNS(uri, tagName)
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49 else:
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50 # When the tagname is not prefixed, it just appears as
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51 # localname
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52 node = self.document.createElement(localname)
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53 for aname,value in attrs.items():
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54 a_uri, a_localname = aname
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55 if a_uri:
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56 qname = self._current_context[a_uri] + ":" + a_localname
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57 attr = self.document.createAttributeNS(a_uri, qname)
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58 else:
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59 attr = self.document.createAttribute(a_localname)
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60 attr.value = value
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61 node.setAttributeNode(attr)
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62 parent = self.curNode
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63 node.parentNode = parent
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64 self.curNode = node
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65 self.lastEvent[1] = [(START_ELEMENT, node), None]
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66 self.lastEvent = self.lastEvent[1]
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67 #self.events.append((START_ELEMENT, node))
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68
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69 def endElementNS(self, name, tagName):
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70 node = self.curNode
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71 self.lastEvent[1] = [(END_ELEMENT, node), None]
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72 self.lastEvent = self.lastEvent[1]
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73 #self.events.append((END_ELEMENT, node))
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74 self.curNode = node.parentNode
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75
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76 def startElement(self, name, attrs):
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77 node = self.document.createElement(name)
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78 for aname,value in attrs.items():
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79 attr = self.document.createAttribute(aname)
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80 attr.value = value
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81 node.setAttributeNode(attr)
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82 parent = self.curNode
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83 node.parentNode = parent
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84 self.curNode = node
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85 self.lastEvent[1] = [(START_ELEMENT, node), None]
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86 self.lastEvent = self.lastEvent[1]
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87 #self.events.append((START_ELEMENT, node))
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88
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89 def endElement(self, name):
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90 node = self.curNode
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91 self.lastEvent[1] = [(END_ELEMENT, node), None]
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92 self.lastEvent = self.lastEvent[1]
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93 #self.events.append((END_ELEMENT, node))
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94 self.curNode = node.parentNode
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95
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96 def comment(self, s):
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97 node = self.document.createComment(s)
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98 parent = self.curNode
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99 node.parentNode = parent
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100 self.lastEvent[1] = [(COMMENT, node), None]
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101 self.lastEvent = self.lastEvent[1]
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102 #self.events.append((COMMENT, node))
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103
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104 def processingInstruction(self, target, data):
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105 node = self.document.createProcessingInstruction(target, data)
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106 parent = self.curNode
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107 node.parentNode = parent
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108 self.lastEvent[1] = [(PROCESSING_INSTRUCTION, node), None]
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109 self.lastEvent = self.lastEvent[1]
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110 #self.events.append((PROCESSING_INSTRUCTION, node))
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111
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112 def ignorableWhitespace(self, chars):
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113 node = self.document.createTextNode(chars[start:start + length])
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114 parent = self.curNode
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115 node.parentNode = parent
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116 self.lastEvent[1] = [(IGNORABLE_WHITESPACE, node), None]
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117 self.lastEvent = self.lastEvent[1]
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118 #self.events.append((IGNORABLE_WHITESPACE, node))
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119
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120 def characters(self, chars):
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121 node = self.document.createTextNode(chars)
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122 parent = self.curNode
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123 node.parentNode = parent
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124 self.lastEvent[1] = [(CHARACTERS, node), None]
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125 self.lastEvent = self.lastEvent[1]
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126
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127 def startDocument(self):
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128 node = self.curNode = self.document = minidom.Document()
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129 node.parentNode = None
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130 self.lastEvent[1] = [(START_DOCUMENT, node), None]
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131 self.lastEvent = self.lastEvent[1]
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132 #self.events.append((START_DOCUMENT, node))
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133
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134 def endDocument(self):
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135 assert not self.curNode.parentNode
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136 for node in self.curNode.childNodes:
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137 if node.nodeType == node.ELEMENT_NODE:
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138 self.document.documentElement = node
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139 #if not self.document.documentElement:
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140 # raise Error, "No document element"
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141 self.lastEvent[1] = [(END_DOCUMENT, node), None]
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142 #self.events.append((END_DOCUMENT, self.curNode))
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143
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144 class ErrorHandler:
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145 def warning(self, exception):
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146 print exception
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147 def error(self, exception):
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148 raise exception
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149 def fatalError(self, exception):
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150 raise exception
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151
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152 class DOMEventStream:
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153 def __init__(self, stream, parser, bufsize):
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154 self.stream = stream
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155 self.parser = parser
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156 self.bufsize = bufsize
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157 self.reset()
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158
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159 def reset(self):
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160 self.pulldom = PullDOM()
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161 # This content handler relies on namespace support
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162 self.parser.setFeature(xml.sax.handler.feature_namespaces,1)
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163 self.parser.setContentHandler(self.pulldom)
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164
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165 def __getitem__(self, pos):
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166 rc = self.getEvent()
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167 if rc:
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168 return rc
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169 raise IndexError
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170
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171 def expandNode(self, node):
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172 event = self.getEvent()
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173 while event:
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174 token, cur_node = event
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175 if cur_node is node:
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176 return
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177 if token != END_ELEMENT:
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178 cur_node.parentNode.appendChild(cur_node)
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179 event = self.getEvent()
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180
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181 def getEvent(self):
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182 if not self.pulldom.firstEvent[1]:
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183 self.pulldom.lastEvent = self.pulldom.firstEvent
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184 while not self.pulldom.firstEvent[1]:
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185 buf=self.stream.read(self.bufsize)
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186 if not buf:
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187 #FIXME: why doesn't Expat close work?
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188 #self.parser.close()
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189 return None
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190 self.parser.feed(buf)
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191 rc = self.pulldom.firstEvent[1][0]
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192 self.pulldom.firstEvent[1] = self.pulldom.firstEvent[1][1]
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193 return rc
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194
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195 class SAX2DOM(PullDOM):
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196
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197 def startElementNS(self, name, tagName , attrs):
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198 PullDOM.startElementNS(self, name, tagName, attrs)
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199 self.curNode.parentNode.appendChild(self.curNode)
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200
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201 def startElement(self, name, attrs):
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202 PullDOM.startElement(self, name, attrs)
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203 self.curNode.parentNode.appendChild(self.curNode)
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204
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205 def processingInstruction(self, target, data):
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206 PullDOM.processingInstruction(self, target, data)
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207 node = self.lastEvent[0][1]
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208 node.parentNode.appendChild(node)
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209
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210 def ignorableWhitespace(self, chars):
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211 PullDOM.ignorableWhitespace(self, chars)
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212 node = self.lastEvent[0][1]
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213 node.parentNode.appendChild(node)
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214
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215 def characters(self, chars):
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216 PullDOM.characters(self, chars)
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217 node = self.lastEvent[0][1]
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218 node.parentNode.appendChild(node)
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219
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220 default_bufsize = (2 ** 14) - 20
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221
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222 def parse(stream_or_string, parser=None, bufsize=default_bufsize):
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223 if type(stream_or_string) in _StringTypes:
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224 stream = open(stream_or_string)
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225 else:
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226 stream = stream_or_string
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227 if not parser:
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228 parser = xml.sax.make_parser()
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229 return DOMEventStream(stream, parser, bufsize)
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230
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231 def parseString(string, parser=None):
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232 bufsize = len(string)
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233 buf = StringIO(string)
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234 if not parser:
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235 parser = xml.sax.make_parser()
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236 return DOMEventStream(buf, parser, bufsize)