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27372
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1 """Implementation of the DOM Level 3 'LS-Load' feature."""
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2
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3 import copy
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4 import xml.dom
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5
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6 from xml.dom.minicompat import *
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7
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8 from xml.dom.NodeFilter import NodeFilter
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9
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10
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11 __all__ = ["DOMBuilder", "DOMEntityResolver", "DOMInputSource"]
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12
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13
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14 class Options:
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15 """Features object that has variables set for each DOMBuilder feature.
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16
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17 The DOMBuilder class uses an instance of this class to pass settings to
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18 the ExpatBuilder class.
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19 """
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20
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21 # Note that the DOMBuilder class in LoadSave constrains which of these
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22 # values can be set using the DOM Level 3 LoadSave feature.
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23
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24 namespaces = 1
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25 namespace_declarations = True
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26 validation = False
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27 external_parameter_entities = True
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28 external_general_entities = True
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29 external_dtd_subset = True
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30 validate_if_schema = False
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31 validate = False
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32 datatype_normalization = False
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33 create_entity_ref_nodes = True
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34 entities = True
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35 whitespace_in_element_content = True
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36 cdata_sections = True
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37 comments = True
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38 charset_overrides_xml_encoding = True
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39 infoset = False
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40 supported_mediatypes_only = False
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41
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42 errorHandler = None
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43 filter = None
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44
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45
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46 class DOMBuilder:
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47 entityResolver = None
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48 errorHandler = None
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49 filter = None
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50
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51 ACTION_REPLACE = 1
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52 ACTION_APPEND_AS_CHILDREN = 2
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53 ACTION_INSERT_AFTER = 3
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54 ACTION_INSERT_BEFORE = 4
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55
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56 _legal_actions = (ACTION_REPLACE, ACTION_APPEND_AS_CHILDREN,
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57 ACTION_INSERT_AFTER, ACTION_INSERT_BEFORE)
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58
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59 def __init__(self):
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60 self._options = Options()
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61
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62 def _get_entityResolver(self):
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63 return self.entityResolver
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64 def _set_entityResolver(self, entityResolver):
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65 self.entityResolver = entityResolver
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66
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67 def _get_errorHandler(self):
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68 return self.errorHandler
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69 def _set_errorHandler(self, errorHandler):
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70 self.errorHandler = errorHandler
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71
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72 def _get_filter(self):
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73 return self.filter
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74 def _set_filter(self, filter):
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75 self.filter = filter
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76
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77 def setFeature(self, name, state):
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78 if self.supportsFeature(name):
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79 state = state and 1 or 0
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80 try:
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81 settings = self._settings[(_name_xform(name), state)]
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82 except KeyError:
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83 raise xml.dom.NotSupportedErr(
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84 "unsupported feature: " + `name`)
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85 else:
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86 for name, value in settings:
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87 setattr(self._options, name, value)
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88 else:
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89 raise xml.dom.NotFoundErr("unknown feature: " + repr(name))
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90
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91 def supportsFeature(self, name):
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92 return hasattr(self._options, _name_xform(name))
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93
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94 def canSetFeature(self, name, state):
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95 key = (_name_xform(name), state and 1 or 0)
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96 return self._settings.has_key(key)
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97
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98 # This dictionary maps from (feature,value) to a list of
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99 # (option,value) pairs that should be set on the Options object.
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100 # If a (feature,value) setting is not in this dictionary, it is
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101 # not supported by the DOMBuilder.
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102 #
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103 _settings = {
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104 ("namespace_declarations", 0): [
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105 ("namespace_declarations", 0)],
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106 ("namespace_declarations", 1): [
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107 ("namespace_declarations", 1)],
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108 ("validation", 0): [
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109 ("validation", 0)],
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110 ("external_general_entities", 0): [
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111 ("external_general_entities", 0)],
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112 ("external_general_entities", 1): [
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113 ("external_general_entities", 1)],
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114 ("external_parameter_entities", 0): [
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115 ("external_parameter_entities", 0)],
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116 ("external_parameter_entities", 1): [
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117 ("external_parameter_entities", 1)],
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118 ("validate_if_schema", 0): [
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119 ("validate_if_schema", 0)],
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120 ("create_entity_ref_nodes", 0): [
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121 ("create_entity_ref_nodes", 0)],
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122 ("create_entity_ref_nodes", 1): [
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123 ("create_entity_ref_nodes", 1)],
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124 ("entities", 0): [
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125 ("create_entity_ref_nodes", 0),
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126 ("entities", 0)],
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127 ("entities", 1): [
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128 ("entities", 1)],
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129 ("whitespace_in_element_content", 0): [
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130 ("whitespace_in_element_content", 0)],
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131 ("whitespace_in_element_content", 1): [
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132 ("whitespace_in_element_content", 1)],
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133 ("cdata_sections", 0): [
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134 ("cdata_sections", 0)],
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135 ("cdata_sections", 1): [
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136 ("cdata_sections", 1)],
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137 ("comments", 0): [
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138 ("comments", 0)],
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139 ("comments", 1): [
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140 ("comments", 1)],
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141 ("charset_overrides_xml_encoding", 0): [
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142 ("charset_overrides_xml_encoding", 0)],
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143 ("charset_overrides_xml_encoding", 1): [
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144 ("charset_overrides_xml_encoding", 1)],
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145 ("infoset", 0): [],
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146 ("infoset", 1): [
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147 ("namespace_declarations", 0),
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148 ("validate_if_schema", 0),
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149 ("create_entity_ref_nodes", 0),
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150 ("entities", 0),
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151 ("cdata_sections", 0),
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152 ("datatype_normalization", 1),
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153 ("whitespace_in_element_content", 1),
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154 ("comments", 1),
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155 ("charset_overrides_xml_encoding", 1)],
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156 ("supported_mediatypes_only", 0): [
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157 ("supported_mediatypes_only", 0)],
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158 ("namespaces", 0): [
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159 ("namespaces", 0)],
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160 ("namespaces", 1): [
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161 ("namespaces", 1)],
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162 }
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163
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164 def getFeature(self, name):
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165 xname = _name_xform(name)
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166 try:
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167 return getattr(self._options, xname)
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168 except AttributeError:
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169 if name == "infoset":
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170 options = self._options
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171 return (options.datatype_normalization
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172 and options.whitespace_in_element_content
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173 and options.comments
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174 and options.charset_overrides_xml_encoding
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175 and not (options.namespace_declarations
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176 or options.validate_if_schema
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177 or options.create_entity_ref_nodes
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178 or options.entities
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179 or options.cdata_sections))
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180 raise xml.dom.NotFoundErr("feature %s not known" % repr(name))
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181
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182 def parseURI(self, uri):
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183 if self.entityResolver:
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184 input = self.entityResolver.resolveEntity(None, uri)
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185 else:
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186 input = DOMEntityResolver().resolveEntity(None, uri)
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187 return self.parse(input)
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188
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189 def parse(self, input):
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190 options = copy.copy(self._options)
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191 options.filter = self.filter
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192 options.errorHandler = self.errorHandler
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193 fp = input.byteStream
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194 if fp is None and options.systemId:
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195 import urllib2
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196 fp = urllib2.urlopen(input.systemId)
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197 return self._parse_bytestream(fp, options)
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198
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199 def parseWithContext(self, input, cnode, action):
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200 if action not in self._legal_actions:
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201 raise ValueError("not a legal action")
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202 raise NotImplementedError("Haven't written this yet...")
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203
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204 def _parse_bytestream(self, stream, options):
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205 import xml.dom.expatbuilder
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206 builder = xml.dom.expatbuilder.makeBuilder(options)
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207 return builder.parseFile(stream)
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208
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209
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210 def _name_xform(name):
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211 return name.lower().replace('-', '_')
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212
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213
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214 class DOMEntityResolver(NewStyle):
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215 __slots__ = '_opener',
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216
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217 def resolveEntity(self, publicId, systemId):
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218 assert systemId is not None
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219 source = DOMInputSource()
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220 source.publicId = publicId
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221 source.systemId = systemId
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222 source.byteStream = self._get_opener().open(systemId)
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223
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224 # determine the encoding if the transport provided it
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225 source.encoding = self._guess_media_encoding(source)
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226
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227 # determine the base URI is we can
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228 import posixpath, urlparse
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229 parts = urlparse.urlparse(systemId)
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230 scheme, netloc, path, params, query, fragment = parts
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231 # XXX should we check the scheme here as well?
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232 if path and not path.endswith("/"):
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233 path = posixpath.dirname(path) + "/"
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234 parts = scheme, netloc, path, params, query, fragment
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235 source.baseURI = urlparse.urlunparse(parts)
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236
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237 return source
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238
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239 def _get_opener(self):
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240 try:
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241 return self._opener
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242 except AttributeError:
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243 self._opener = self._create_opener()
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244 return self._opener
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245
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246 def _create_opener(self):
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247 import urllib2
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248 return urllib2.build_opener()
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249
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250 def _guess_media_encoding(self, source):
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251 info = source.byteStream.info()
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252 if info.has_key("Content-Type"):
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253 for param in info.getplist():
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254 if param.startswith("charset="):
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255 return param.split("=", 1)[1].lower()
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256
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257
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258 class DOMInputSource(NewStyle):
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259 __slots__ = ('byteStream', 'characterStream', 'stringData',
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260 'encoding', 'publicId', 'systemId', 'baseURI')
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261
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262 def __init__(self):
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263 self.byteStream = None
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264 self.characterStream = None
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265 self.stringData = None
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266 self.encoding = None
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267 self.publicId = None
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268 self.systemId = None
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269 self.baseURI = None
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270
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271 def _get_byteStream(self):
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272 return self.byteStream
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273 def _set_byteStream(self, byteStream):
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274 self.byteStream = byteStream
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275
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276 def _get_characterStream(self):
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277 return self.characterStream
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278 def _set_characterStream(self, characterStream):
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279 self.characterStream = characterStream
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280
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281 def _get_stringData(self):
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282 return self.stringData
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283 def _set_stringData(self, data):
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284 self.stringData = data
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285
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286 def _get_encoding(self):
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287 return self.encoding
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288 def _set_encoding(self, encoding):
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289 self.encoding = encoding
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290
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291 def _get_publicId(self):
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292 return self.publicId
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293 def _set_publicId(self, publicId):
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294 self.publicId = publicId
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295
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296 def _get_systemId(self):
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297 return self.systemId
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298 def _set_systemId(self, systemId):
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299 self.systemId = systemId
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300
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301 def _get_baseURI(self):
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302 return self.baseURI
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303 def _set_baseURI(self, uri):
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304 self.baseURI = uri
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305
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306
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307 class DOMBuilderFilter:
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308 """Element filter which can be used to tailor construction of
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309 a DOM instance.
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310 """
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311
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312 # There's really no need for this class; concrete implementations
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313 # should just implement the endElement() and startElement()
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314 # methods as appropriate. Using this makes it easy to only
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315 # implement one of them.
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316
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317 FILTER_ACCEPT = 1
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318 FILTER_REJECT = 2
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319 FILTER_SKIP = 3
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320 FILTER_INTERRUPT = 4
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321
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322 whatToShow = NodeFilter.SHOW_ALL
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323
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324 def _get_whatToShow(self):
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325 return self.whatToShow
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326
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327 def acceptNode(self, element):
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328 return self.FILTER_ACCEPT
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329
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330 def startContainer(self, element):
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331 return self.FILTER_ACCEPT
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332
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333 del NodeFilter
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334
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335
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336 class DocumentLS:
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337 """Mixin to create documents that conform to the load/save spec."""
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338
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339 async = False
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340
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341 def _get_async(self):
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342 return False
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343 def _set_async(self, async):
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344 if async:
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345 raise xml.dom.NotSupportedErr(
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346 "asynchronous document loading is not supported")
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347
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348 def abort(self):
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349 # What does it mean to "clear" a document? Does the
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350 # documentElement disappear?
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351 raise NotImplementedError(
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352 "haven't figured out what this means yet")
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353
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354 def load(self, uri):
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355 raise NotImplementedError("haven't written this yet")
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356
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357 def loadXML(self, source):
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358 raise NotImplementedError("haven't written this yet")
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359
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360 def saveXML(self, snode):
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361 if snode is None:
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362 snode = self
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363 elif snode.ownerDocument is not self:
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364 raise xml.dom.WrongDocumentErr()
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365 return snode.toxml()
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366
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367
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368 class DOMImplementationLS:
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369 MODE_SYNCHRONOUS = 1
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370 MODE_ASYNCHRONOUS = 2
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371
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372 def createDOMBuilder(self, mode, schemaType):
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373 if schemaType is not None:
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374 raise xml.dom.NotSupportedErr(
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375 "schemaType not yet supported")
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376 if mode == self.MODE_SYNCHRONOUS:
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377 return DOMBuilder()
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378 if mode == self.MODE_ASYNCHRONOUS:
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379 raise xml.dom.NotSupportedErr(
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380 "asynchronous builders are not supported")
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381 raise ValueError("unknown value for mode")
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382
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383 def createDOMWriter(self):
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384 raise NotImplementedError(
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385 "the writer interface hasn't been written yet!")
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386
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387 def createDOMInputSource(self):
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388 return DOMInputSource()
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