Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/bleach/_vendor/html5lib/treebuilders/etree_lxml.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 """Module for supporting the lxml.etree library. The idea here is to use as much |
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2 of the native library as possible, without using fragile hacks like custom element |
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3 names that break between releases. The downside of this is that we cannot represent |
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4 all possible trees; specifically the following are known to cause problems: |
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5 |
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6 Text or comments as siblings of the root element |
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7 Docypes with no name |
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8 |
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9 When any of these things occur, we emit a DataLossWarning |
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10 """ |
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11 |
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12 from __future__ import absolute_import, division, unicode_literals |
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13 # pylint:disable=protected-access |
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14 |
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15 import warnings |
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16 import re |
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17 import sys |
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18 |
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19 try: |
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20 from collections.abc import MutableMapping |
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21 except ImportError: |
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22 from collections import MutableMapping |
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23 |
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24 from . import base |
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25 from ..constants import DataLossWarning |
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26 from .. import constants |
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27 from . import etree as etree_builders |
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28 from .. import _ihatexml |
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29 |
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30 import lxml.etree as etree |
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31 from six import PY3, binary_type |
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32 |
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33 |
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34 fullTree = True |
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35 tag_regexp = re.compile("{([^}]*)}(.*)") |
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36 |
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37 comment_type = etree.Comment("asd").tag |
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38 |
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39 |
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40 class DocumentType(object): |
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41 def __init__(self, name, publicId, systemId): |
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42 self.name = name |
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43 self.publicId = publicId |
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44 self.systemId = systemId |
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45 |
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46 |
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47 class Document(object): |
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48 def __init__(self): |
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49 self._elementTree = None |
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50 self._childNodes = [] |
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51 |
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52 def appendChild(self, element): |
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53 last = self._elementTree.getroot() |
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54 for last in self._elementTree.getroot().itersiblings(): |
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55 pass |
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56 |
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57 last.addnext(element._element) |
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58 |
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59 def _getChildNodes(self): |
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60 return self._childNodes |
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61 |
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62 childNodes = property(_getChildNodes) |
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63 |
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64 |
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65 def testSerializer(element): |
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66 rv = [] |
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67 infosetFilter = _ihatexml.InfosetFilter(preventDoubleDashComments=True) |
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68 |
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69 def serializeElement(element, indent=0): |
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70 if not hasattr(element, "tag"): |
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71 if hasattr(element, "getroot"): |
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72 # Full tree case |
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73 rv.append("#document") |
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74 if element.docinfo.internalDTD: |
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75 if not (element.docinfo.public_id or |
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76 element.docinfo.system_url): |
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77 dtd_str = "<!DOCTYPE %s>" % element.docinfo.root_name |
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78 else: |
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79 dtd_str = """<!DOCTYPE %s "%s" "%s">""" % ( |
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80 element.docinfo.root_name, |
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81 element.docinfo.public_id, |
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82 element.docinfo.system_url) |
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83 rv.append("|%s%s" % (' ' * (indent + 2), dtd_str)) |
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84 next_element = element.getroot() |
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85 while next_element.getprevious() is not None: |
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86 next_element = next_element.getprevious() |
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87 while next_element is not None: |
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88 serializeElement(next_element, indent + 2) |
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89 next_element = next_element.getnext() |
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90 elif isinstance(element, str) or isinstance(element, bytes): |
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91 # Text in a fragment |
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92 assert isinstance(element, str) or sys.version_info[0] == 2 |
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93 rv.append("|%s\"%s\"" % (' ' * indent, element)) |
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94 else: |
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95 # Fragment case |
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96 rv.append("#document-fragment") |
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97 for next_element in element: |
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98 serializeElement(next_element, indent + 2) |
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99 elif element.tag == comment_type: |
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100 rv.append("|%s<!-- %s -->" % (' ' * indent, element.text)) |
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101 if hasattr(element, "tail") and element.tail: |
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102 rv.append("|%s\"%s\"" % (' ' * indent, element.tail)) |
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103 else: |
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104 assert isinstance(element, etree._Element) |
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105 nsmatch = etree_builders.tag_regexp.match(element.tag) |
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106 if nsmatch is not None: |
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107 ns = nsmatch.group(1) |
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108 tag = nsmatch.group(2) |
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109 prefix = constants.prefixes[ns] |
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110 rv.append("|%s<%s %s>" % (' ' * indent, prefix, |
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111 infosetFilter.fromXmlName(tag))) |
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112 else: |
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113 rv.append("|%s<%s>" % (' ' * indent, |
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114 infosetFilter.fromXmlName(element.tag))) |
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115 |
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116 if hasattr(element, "attrib"): |
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117 attributes = [] |
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118 for name, value in element.attrib.items(): |
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119 nsmatch = tag_regexp.match(name) |
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120 if nsmatch is not None: |
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121 ns, name = nsmatch.groups() |
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122 name = infosetFilter.fromXmlName(name) |
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123 prefix = constants.prefixes[ns] |
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124 attr_string = "%s %s" % (prefix, name) |
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125 else: |
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126 attr_string = infosetFilter.fromXmlName(name) |
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127 attributes.append((attr_string, value)) |
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128 |
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129 for name, value in sorted(attributes): |
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130 rv.append('|%s%s="%s"' % (' ' * (indent + 2), name, value)) |
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131 |
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132 if element.text: |
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133 rv.append("|%s\"%s\"" % (' ' * (indent + 2), element.text)) |
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134 indent += 2 |
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135 for child in element: |
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136 serializeElement(child, indent) |
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137 if hasattr(element, "tail") and element.tail: |
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138 rv.append("|%s\"%s\"" % (' ' * (indent - 2), element.tail)) |
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139 serializeElement(element, 0) |
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140 |
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141 return "\n".join(rv) |
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142 |
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143 |
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144 def tostring(element): |
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145 """Serialize an element and its child nodes to a string""" |
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146 rv = [] |
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147 |
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148 def serializeElement(element): |
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149 if not hasattr(element, "tag"): |
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150 if element.docinfo.internalDTD: |
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151 if element.docinfo.doctype: |
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152 dtd_str = element.docinfo.doctype |
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153 else: |
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154 dtd_str = "<!DOCTYPE %s>" % element.docinfo.root_name |
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155 rv.append(dtd_str) |
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156 serializeElement(element.getroot()) |
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157 |
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158 elif element.tag == comment_type: |
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159 rv.append("<!--%s-->" % (element.text,)) |
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160 |
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161 else: |
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162 # This is assumed to be an ordinary element |
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163 if not element.attrib: |
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164 rv.append("<%s>" % (element.tag,)) |
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165 else: |
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166 attr = " ".join(["%s=\"%s\"" % (name, value) |
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167 for name, value in element.attrib.items()]) |
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168 rv.append("<%s %s>" % (element.tag, attr)) |
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169 if element.text: |
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170 rv.append(element.text) |
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171 |
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172 for child in element: |
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173 serializeElement(child) |
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174 |
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175 rv.append("</%s>" % (element.tag,)) |
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176 |
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177 if hasattr(element, "tail") and element.tail: |
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178 rv.append(element.tail) |
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179 |
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180 serializeElement(element) |
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181 |
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182 return "".join(rv) |
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183 |
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184 |
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185 class TreeBuilder(base.TreeBuilder): |
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186 documentClass = Document |
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187 doctypeClass = DocumentType |
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188 elementClass = None |
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189 commentClass = None |
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190 fragmentClass = Document |
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191 implementation = etree |
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192 |
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193 def __init__(self, namespaceHTMLElements, fullTree=False): |
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194 builder = etree_builders.getETreeModule(etree, fullTree=fullTree) |
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195 infosetFilter = self.infosetFilter = _ihatexml.InfosetFilter(preventDoubleDashComments=True) |
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196 self.namespaceHTMLElements = namespaceHTMLElements |
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197 |
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198 class Attributes(MutableMapping): |
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199 def __init__(self, element): |
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200 self._element = element |
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201 |
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202 def _coerceKey(self, key): |
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203 if isinstance(key, tuple): |
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204 name = "{%s}%s" % (key[2], infosetFilter.coerceAttribute(key[1])) |
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205 else: |
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206 name = infosetFilter.coerceAttribute(key) |
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207 return name |
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208 |
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209 def __getitem__(self, key): |
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210 value = self._element._element.attrib[self._coerceKey(key)] |
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211 if not PY3 and isinstance(value, binary_type): |
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212 value = value.decode("ascii") |
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213 return value |
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214 |
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215 def __setitem__(self, key, value): |
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216 self._element._element.attrib[self._coerceKey(key)] = value |
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217 |
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218 def __delitem__(self, key): |
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219 del self._element._element.attrib[self._coerceKey(key)] |
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220 |
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221 def __iter__(self): |
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222 return iter(self._element._element.attrib) |
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223 |
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224 def __len__(self): |
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225 return len(self._element._element.attrib) |
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226 |
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227 def clear(self): |
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228 return self._element._element.attrib.clear() |
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229 |
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230 class Element(builder.Element): |
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231 def __init__(self, name, namespace): |
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232 name = infosetFilter.coerceElement(name) |
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233 builder.Element.__init__(self, name, namespace=namespace) |
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234 self._attributes = Attributes(self) |
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235 |
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236 def _setName(self, name): |
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237 self._name = infosetFilter.coerceElement(name) |
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238 self._element.tag = self._getETreeTag( |
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239 self._name, self._namespace) |
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240 |
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241 def _getName(self): |
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242 return infosetFilter.fromXmlName(self._name) |
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243 |
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244 name = property(_getName, _setName) |
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245 |
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246 def _getAttributes(self): |
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247 return self._attributes |
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248 |
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249 def _setAttributes(self, value): |
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250 attributes = self.attributes |
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251 attributes.clear() |
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252 attributes.update(value) |
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253 |
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254 attributes = property(_getAttributes, _setAttributes) |
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255 |
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256 def insertText(self, data, insertBefore=None): |
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257 data = infosetFilter.coerceCharacters(data) |
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258 builder.Element.insertText(self, data, insertBefore) |
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259 |
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260 def cloneNode(self): |
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261 element = type(self)(self.name, self.namespace) |
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262 if self._element.attrib: |
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263 element._element.attrib.update(self._element.attrib) |
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264 return element |
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265 |
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266 class Comment(builder.Comment): |
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267 def __init__(self, data): |
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268 data = infosetFilter.coerceComment(data) |
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269 builder.Comment.__init__(self, data) |
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270 |
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271 def _setData(self, data): |
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272 data = infosetFilter.coerceComment(data) |
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273 self._element.text = data |
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274 |
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275 def _getData(self): |
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276 return self._element.text |
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277 |
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278 data = property(_getData, _setData) |
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279 |
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280 self.elementClass = Element |
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281 self.commentClass = Comment |
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282 # self.fragmentClass = builder.DocumentFragment |
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283 base.TreeBuilder.__init__(self, namespaceHTMLElements) |
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284 |
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285 def reset(self): |
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286 base.TreeBuilder.reset(self) |
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287 self.insertComment = self.insertCommentInitial |
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288 self.initial_comments = [] |
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289 self.doctype = None |
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290 |
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291 def testSerializer(self, element): |
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292 return testSerializer(element) |
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293 |
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294 def getDocument(self): |
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295 if fullTree: |
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296 return self.document._elementTree |
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297 else: |
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298 return self.document._elementTree.getroot() |
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299 |
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300 def getFragment(self): |
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301 fragment = [] |
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302 element = self.openElements[0]._element |
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303 if element.text: |
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304 fragment.append(element.text) |
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305 fragment.extend(list(element)) |
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306 if element.tail: |
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307 fragment.append(element.tail) |
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308 return fragment |
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309 |
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310 def insertDoctype(self, token): |
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311 name = token["name"] |
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312 publicId = token["publicId"] |
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313 systemId = token["systemId"] |
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314 |
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315 if not name: |
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316 warnings.warn("lxml cannot represent empty doctype", DataLossWarning) |
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317 self.doctype = None |
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318 else: |
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319 coercedName = self.infosetFilter.coerceElement(name) |
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320 if coercedName != name: |
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321 warnings.warn("lxml cannot represent non-xml doctype", DataLossWarning) |
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322 |
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323 doctype = self.doctypeClass(coercedName, publicId, systemId) |
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324 self.doctype = doctype |
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325 |
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326 def insertCommentInitial(self, data, parent=None): |
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327 assert parent is None or parent is self.document |
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328 assert self.document._elementTree is None |
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329 self.initial_comments.append(data) |
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330 |
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331 def insertCommentMain(self, data, parent=None): |
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332 if (parent == self.document and |
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333 self.document._elementTree.getroot()[-1].tag == comment_type): |
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334 warnings.warn("lxml cannot represent adjacent comments beyond the root elements", DataLossWarning) |
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335 super(TreeBuilder, self).insertComment(data, parent) |
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336 |
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337 def insertRoot(self, token): |
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338 # Because of the way libxml2 works, it doesn't seem to be possible to |
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339 # alter information like the doctype after the tree has been parsed. |
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340 # Therefore we need to use the built-in parser to create our initial |
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341 # tree, after which we can add elements like normal |
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342 docStr = "" |
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343 if self.doctype: |
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344 assert self.doctype.name |
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345 docStr += "<!DOCTYPE %s" % self.doctype.name |
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346 if (self.doctype.publicId is not None or |
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347 self.doctype.systemId is not None): |
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348 docStr += (' PUBLIC "%s" ' % |
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349 (self.infosetFilter.coercePubid(self.doctype.publicId or ""))) |
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350 if self.doctype.systemId: |
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351 sysid = self.doctype.systemId |
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352 if sysid.find("'") >= 0 and sysid.find('"') >= 0: |
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353 warnings.warn("DOCTYPE system cannot contain single and double quotes", DataLossWarning) |
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354 sysid = sysid.replace("'", 'U00027') |
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355 if sysid.find("'") >= 0: |
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356 docStr += '"%s"' % sysid |
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357 else: |
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358 docStr += "'%s'" % sysid |
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359 else: |
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360 docStr += "''" |
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361 docStr += ">" |
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362 if self.doctype.name != token["name"]: |
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363 warnings.warn("lxml cannot represent doctype with a different name to the root element", DataLossWarning) |
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364 docStr += "<THIS_SHOULD_NEVER_APPEAR_PUBLICLY/>" |
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365 root = etree.fromstring(docStr) |
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366 |
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367 # Append the initial comments: |
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368 for comment_token in self.initial_comments: |
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369 comment = self.commentClass(comment_token["data"]) |
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370 root.addprevious(comment._element) |
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371 |
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372 # Create the root document and add the ElementTree to it |
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373 self.document = self.documentClass() |
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374 self.document._elementTree = root.getroottree() |
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375 |
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376 # Give the root element the right name |
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377 name = token["name"] |
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378 namespace = token.get("namespace", self.defaultNamespace) |
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379 if namespace is None: |
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380 etree_tag = name |
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381 else: |
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382 etree_tag = "{%s}%s" % (namespace, name) |
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383 root.tag = etree_tag |
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384 |
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385 # Add the root element to the internal child/open data structures |
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386 root_element = self.elementClass(name, namespace) |
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387 root_element._element = root |
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388 self.document._childNodes.append(root_element) |
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389 self.openElements.append(root_element) |
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390 |
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391 # Reset to the default insert comment function |
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392 self.insertComment = self.insertCommentMain |