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annotate planemo/lib/python3.7/site-packages/bs4/builder/_html5lib.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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1 # Use of this source code is governed by the MIT license.
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2 __license__ = "MIT"
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3
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4 __all__ = [
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5 'HTML5TreeBuilder',
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6 ]
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7
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8 import warnings
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9 import re
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10 from bs4.builder import (
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11 PERMISSIVE,
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12 HTML,
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13 HTML_5,
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14 HTMLTreeBuilder,
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15 )
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16 from bs4.element import (
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17 NamespacedAttribute,
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18 nonwhitespace_re,
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19 )
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20 import html5lib
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21 from html5lib.constants import (
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22 namespaces,
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23 prefixes,
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24 )
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25 from bs4.element import (
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26 Comment,
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27 Doctype,
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28 NavigableString,
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29 Tag,
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30 )
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31
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32 try:
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33 # Pre-0.99999999
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34 from html5lib.treebuilders import _base as treebuilder_base
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35 new_html5lib = False
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36 except ImportError as e:
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37 # 0.99999999 and up
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38 from html5lib.treebuilders import base as treebuilder_base
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39 new_html5lib = True
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40
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41 class HTML5TreeBuilder(HTMLTreeBuilder):
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42 """Use html5lib to build a tree.
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43
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44 Note that this TreeBuilder does not support some features common
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45 to HTML TreeBuilders. Some of these features could theoretically
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46 be implemented, but at the very least it's quite difficult,
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47 because html5lib moves the parse tree around as it's being built.
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48
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49 * This TreeBuilder doesn't use different subclasses of NavigableString
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50 based on the name of the tag in which the string was found.
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51
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52 * You can't use a SoupStrainer to parse only part of a document.
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53 """
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54
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55 NAME = "html5lib"
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56
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57 features = [NAME, PERMISSIVE, HTML_5, HTML]
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58
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59 # html5lib can tell us which line number and position in the
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60 # original file is the source of an element.
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61 TRACKS_LINE_NUMBERS = True
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62
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63 def prepare_markup(self, markup, user_specified_encoding,
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64 document_declared_encoding=None, exclude_encodings=None):
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65 # Store the user-specified encoding for use later on.
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66 self.user_specified_encoding = user_specified_encoding
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67
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68 # document_declared_encoding and exclude_encodings aren't used
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69 # ATM because the html5lib TreeBuilder doesn't use
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70 # UnicodeDammit.
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71 if exclude_encodings:
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72 warnings.warn("You provided a value for exclude_encoding, but the html5lib tree builder doesn't support exclude_encoding.")
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73 yield (markup, None, None, False)
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74
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75 # These methods are defined by Beautiful Soup.
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76 def feed(self, markup):
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77 if self.soup.parse_only is not None:
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78 warnings.warn("You provided a value for parse_only, but the html5lib tree builder doesn't support parse_only. The entire document will be parsed.")
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79 parser = html5lib.HTMLParser(tree=self.create_treebuilder)
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80 self.underlying_builder.parser = parser
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81 extra_kwargs = dict()
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82 if not isinstance(markup, str):
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83 if new_html5lib:
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84 extra_kwargs['override_encoding'] = self.user_specified_encoding
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85 else:
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86 extra_kwargs['encoding'] = self.user_specified_encoding
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87 doc = parser.parse(markup, **extra_kwargs)
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88
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89 # Set the character encoding detected by the tokenizer.
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90 if isinstance(markup, str):
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91 # We need to special-case this because html5lib sets
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92 # charEncoding to UTF-8 if it gets Unicode input.
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93 doc.original_encoding = None
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94 else:
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95 original_encoding = parser.tokenizer.stream.charEncoding[0]
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96 if not isinstance(original_encoding, str):
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97 # In 0.99999999 and up, the encoding is an html5lib
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98 # Encoding object. We want to use a string for compatibility
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99 # with other tree builders.
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100 original_encoding = original_encoding.name
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101 doc.original_encoding = original_encoding
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102 self.underlying_builder.parser = None
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103
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104 def create_treebuilder(self, namespaceHTMLElements):
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105 self.underlying_builder = TreeBuilderForHtml5lib(
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106 namespaceHTMLElements, self.soup,
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107 store_line_numbers=self.store_line_numbers
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108 )
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109 return self.underlying_builder
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110
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111 def test_fragment_to_document(self, fragment):
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112 """See `TreeBuilder`."""
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113 return '<html><head></head><body>%s</body></html>' % fragment
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114
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115
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116 class TreeBuilderForHtml5lib(treebuilder_base.TreeBuilder):
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117
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118 def __init__(self, namespaceHTMLElements, soup=None,
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119 store_line_numbers=True, **kwargs):
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120 if soup:
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121 self.soup = soup
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122 else:
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123 from bs4 import BeautifulSoup
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124 # TODO: Why is the parser 'html.parser' here? To avoid an
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125 # infinite loop?
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126 self.soup = BeautifulSoup(
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127 "", "html.parser", store_line_numbers=store_line_numbers,
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128 **kwargs
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129 )
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130 # TODO: What are **kwargs exactly? Should they be passed in
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131 # here in addition to/instead of being passed to the BeautifulSoup
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132 # constructor?
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133 super(TreeBuilderForHtml5lib, self).__init__(namespaceHTMLElements)
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134
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135 # This will be set later to an html5lib.html5parser.HTMLParser
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136 # object, which we can use to track the current line number.
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137 self.parser = None
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138 self.store_line_numbers = store_line_numbers
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139
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140 def documentClass(self):
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141 self.soup.reset()
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142 return Element(self.soup, self.soup, None)
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143
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144 def insertDoctype(self, token):
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145 name = token["name"]
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146 publicId = token["publicId"]
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147 systemId = token["systemId"]
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148
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149 doctype = Doctype.for_name_and_ids(name, publicId, systemId)
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150 self.soup.object_was_parsed(doctype)
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151
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152 def elementClass(self, name, namespace):
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153 kwargs = {}
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154 if self.parser and self.store_line_numbers:
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155 # This represents the point immediately after the end of the
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156 # tag. We don't know when the tag started, but we do know
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157 # where it ended -- the character just before this one.
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158 sourceline, sourcepos = self.parser.tokenizer.stream.position()
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159 kwargs['sourceline'] = sourceline
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160 kwargs['sourcepos'] = sourcepos-1
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161 tag = self.soup.new_tag(name, namespace, **kwargs)
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162
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163 return Element(tag, self.soup, namespace)
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164
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165 def commentClass(self, data):
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166 return TextNode(Comment(data), self.soup)
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167
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168 def fragmentClass(self):
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169 from bs4 import BeautifulSoup
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170 # TODO: Why is the parser 'html.parser' here? To avoid an
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171 # infinite loop?
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172 self.soup = BeautifulSoup("", "html.parser")
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173 self.soup.name = "[document_fragment]"
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174 return Element(self.soup, self.soup, None)
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175
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176 def appendChild(self, node):
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177 # XXX This code is not covered by the BS4 tests.
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178 self.soup.append(node.element)
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179
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180 def getDocument(self):
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181 return self.soup
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182
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183 def getFragment(self):
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184 return treebuilder_base.TreeBuilder.getFragment(self).element
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185
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186 def testSerializer(self, element):
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187 from bs4 import BeautifulSoup
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188 rv = []
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189 doctype_re = re.compile(r'^(.*?)(?: PUBLIC "(.*?)"(?: "(.*?)")?| SYSTEM "(.*?)")?$')
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190
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191 def serializeElement(element, indent=0):
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192 if isinstance(element, BeautifulSoup):
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193 pass
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194 if isinstance(element, Doctype):
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195 m = doctype_re.match(element)
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196 if m:
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197 name = m.group(1)
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198 if m.lastindex > 1:
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199 publicId = m.group(2) or ""
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200 systemId = m.group(3) or m.group(4) or ""
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201 rv.append("""|%s<!DOCTYPE %s "%s" "%s">""" %
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202 (' ' * indent, name, publicId, systemId))
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203 else:
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204 rv.append("|%s<!DOCTYPE %s>" % (' ' * indent, name))
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205 else:
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206 rv.append("|%s<!DOCTYPE >" % (' ' * indent,))
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207 elif isinstance(element, Comment):
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208 rv.append("|%s<!-- %s -->" % (' ' * indent, element))
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209 elif isinstance(element, NavigableString):
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210 rv.append("|%s\"%s\"" % (' ' * indent, element))
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211 else:
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212 if element.namespace:
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213 name = "%s %s" % (prefixes[element.namespace],
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214 element.name)
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215 else:
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216 name = element.name
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217 rv.append("|%s<%s>" % (' ' * indent, name))
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218 if element.attrs:
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219 attributes = []
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220 for name, value in list(element.attrs.items()):
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221 if isinstance(name, NamespacedAttribute):
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222 name = "%s %s" % (prefixes[name.namespace], name.name)
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223 if isinstance(value, list):
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224 value = " ".join(value)
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225 attributes.append((name, value))
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226
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227 for name, value in sorted(attributes):
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228 rv.append('|%s%s="%s"' % (' ' * (indent + 2), name, value))
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229 indent += 2
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230 for child in element.children:
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231 serializeElement(child, indent)
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232 serializeElement(element, 0)
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233
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234 return "\n".join(rv)
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235
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236 class AttrList(object):
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237 def __init__(self, element):
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238 self.element = element
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239 self.attrs = dict(self.element.attrs)
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240 def __iter__(self):
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241 return list(self.attrs.items()).__iter__()
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242 def __setitem__(self, name, value):
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243 # If this attribute is a multi-valued attribute for this element,
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244 # turn its value into a list.
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245 list_attr = self.element.cdata_list_attributes
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246 if (name in list_attr['*']
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247 or (self.element.name in list_attr
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248 and name in list_attr[self.element.name])):
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249 # A node that is being cloned may have already undergone
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250 # this procedure.
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251 if not isinstance(value, list):
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252 value = nonwhitespace_re.findall(value)
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253 self.element[name] = value
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254 def items(self):
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255 return list(self.attrs.items())
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256 def keys(self):
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257 return list(self.attrs.keys())
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258 def __len__(self):
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259 return len(self.attrs)
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260 def __getitem__(self, name):
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261 return self.attrs[name]
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262 def __contains__(self, name):
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263 return name in list(self.attrs.keys())
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264
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265
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266 class Element(treebuilder_base.Node):
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267 def __init__(self, element, soup, namespace):
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268 treebuilder_base.Node.__init__(self, element.name)
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269 self.element = element
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270 self.soup = soup
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271 self.namespace = namespace
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272
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273 def appendChild(self, node):
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274 string_child = child = None
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275 if isinstance(node, str):
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276 # Some other piece of code decided to pass in a string
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277 # instead of creating a TextElement object to contain the
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278 # string.
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279 string_child = child = node
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280 elif isinstance(node, Tag):
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281 # Some other piece of code decided to pass in a Tag
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282 # instead of creating an Element object to contain the
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283 # Tag.
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284 child = node
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285 elif node.element.__class__ == NavigableString:
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286 string_child = child = node.element
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287 node.parent = self
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288 else:
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289 child = node.element
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290 node.parent = self
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291
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292 if not isinstance(child, str) and child.parent is not None:
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293 node.element.extract()
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294
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295 if (string_child is not None and self.element.contents
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296 and self.element.contents[-1].__class__ == NavigableString):
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297 # We are appending a string onto another string.
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298 # TODO This has O(n^2) performance, for input like
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299 # "a</a>a</a>a</a>..."
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300 old_element = self.element.contents[-1]
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301 new_element = self.soup.new_string(old_element + string_child)
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302 old_element.replace_with(new_element)
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303 self.soup._most_recent_element = new_element
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304 else:
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305 if isinstance(node, str):
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306 # Create a brand new NavigableString from this string.
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307 child = self.soup.new_string(node)
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308
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309 # Tell Beautiful Soup to act as if it parsed this element
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310 # immediately after the parent's last descendant. (Or
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311 # immediately after the parent, if it has no children.)
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312 if self.element.contents:
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313 most_recent_element = self.element._last_descendant(False)
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314 elif self.element.next_element is not None:
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315 # Something from further ahead in the parse tree is
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316 # being inserted into this earlier element. This is
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317 # very annoying because it means an expensive search
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318 # for the last element in the tree.
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319 most_recent_element = self.soup._last_descendant()
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320 else:
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321 most_recent_element = self.element
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322
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323 self.soup.object_was_parsed(
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324 child, parent=self.element,
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325 most_recent_element=most_recent_element)
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326
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327 def getAttributes(self):
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328 if isinstance(self.element, Comment):
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329 return {}
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330 return AttrList(self.element)
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331
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332 def setAttributes(self, attributes):
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333 if attributes is not None and len(attributes) > 0:
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334 converted_attributes = []
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335 for name, value in list(attributes.items()):
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336 if isinstance(name, tuple):
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337 new_name = NamespacedAttribute(*name)
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338 del attributes[name]
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339 attributes[new_name] = value
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340
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341 self.soup.builder._replace_cdata_list_attribute_values(
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342 self.name, attributes)
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343 for name, value in list(attributes.items()):
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344 self.element[name] = value
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345
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346 # The attributes may contain variables that need substitution.
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347 # Call set_up_substitutions manually.
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348 #
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349 # The Tag constructor called this method when the Tag was created,
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350 # but we just set/changed the attributes, so call it again.
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351 self.soup.builder.set_up_substitutions(self.element)
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352 attributes = property(getAttributes, setAttributes)
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353
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354 def insertText(self, data, insertBefore=None):
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355 text = TextNode(self.soup.new_string(data), self.soup)
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356 if insertBefore:
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357 self.insertBefore(text, insertBefore)
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358 else:
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359 self.appendChild(text)
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360
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361 def insertBefore(self, node, refNode):
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362 index = self.element.index(refNode.element)
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363 if (node.element.__class__ == NavigableString and self.element.contents
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364 and self.element.contents[index-1].__class__ == NavigableString):
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365 # (See comments in appendChild)
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366 old_node = self.element.contents[index-1]
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367 new_str = self.soup.new_string(old_node + node.element)
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368 old_node.replace_with(new_str)
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369 else:
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370 self.element.insert(index, node.element)
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371 node.parent = self
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372
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373 def removeChild(self, node):
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374 node.element.extract()
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375
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376 def reparentChildren(self, new_parent):
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377 """Move all of this tag's children into another tag."""
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378 # print("MOVE", self.element.contents)
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379 # print("FROM", self.element)
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380 # print("TO", new_parent.element)
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381
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382 element = self.element
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383 new_parent_element = new_parent.element
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384 # Determine what this tag's next_element will be once all the children
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385 # are removed.
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386 final_next_element = element.next_sibling
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387
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388 new_parents_last_descendant = new_parent_element._last_descendant(False, False)
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389 if len(new_parent_element.contents) > 0:
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guerler
parents:
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390 # The new parent already contains children. We will be
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
391 # appending this tag's children to the end.
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parents:
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392 new_parents_last_child = new_parent_element.contents[-1]
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guerler
parents:
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393 new_parents_last_descendant_next_element = new_parents_last_descendant.next_element
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parents:
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394 else:
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parents:
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395 # The new parent contains no children.
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parents:
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396 new_parents_last_child = None
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parents:
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397 new_parents_last_descendant_next_element = new_parent_element.next_element
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parents:
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398
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399 to_append = element.contents
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parents:
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400 if len(to_append) > 0:
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parents:
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401 # Set the first child's previous_element and previous_sibling
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guerler
parents:
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402 # to elements within the new parent
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parents:
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403 first_child = to_append[0]
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parents:
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404 if new_parents_last_descendant is not None:
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guerler
parents:
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405 first_child.previous_element = new_parents_last_descendant
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parents:
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406 else:
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parents:
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407 first_child.previous_element = new_parent_element
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guerler
parents:
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408 first_child.previous_sibling = new_parents_last_child
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guerler
parents:
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409 if new_parents_last_descendant is not None:
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guerler
parents:
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410 new_parents_last_descendant.next_element = first_child
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parents:
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411 else:
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parents:
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412 new_parent_element.next_element = first_child
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guerler
parents:
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413 if new_parents_last_child is not None:
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guerler
parents:
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414 new_parents_last_child.next_sibling = first_child
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guerler
parents:
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415
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parents:
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416 # Find the very last element being moved. It is now the
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guerler
parents:
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417 # parent's last descendant. It has no .next_sibling and
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parents:
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418 # its .next_element is whatever the previous last
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parents:
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419 # descendant had.
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parents:
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420 last_childs_last_descendant = to_append[-1]._last_descendant(False, True)
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guerler
parents:
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421
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parents:
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422 last_childs_last_descendant.next_element = new_parents_last_descendant_next_element
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parents:
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423 if new_parents_last_descendant_next_element is not None:
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guerler
parents:
diff changeset
424 # TODO: This code has no test coverage and I'm not sure
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guerler
parents:
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425 # how to get html5lib to go through this path, but it's
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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426 # just the other side of the previous line.
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guerler
parents:
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427 new_parents_last_descendant_next_element.previous_element = last_childs_last_descendant
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guerler
parents:
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428 last_childs_last_descendant.next_sibling = None
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parents:
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429
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parents:
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430 for child in to_append:
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parents:
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431 child.parent = new_parent_element
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parents:
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432 new_parent_element.contents.append(child)
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guerler
parents:
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433
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
434 # Now that this element has no children, change its .next_element.
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guerler
parents:
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435 element.contents = []
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parents:
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436 element.next_element = final_next_element
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parents:
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437
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
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438 # print("DONE WITH MOVE")
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guerler
parents:
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439 # print("FROM", self.element)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
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440 # print("TO", new_parent_element)
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parents:
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441
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parents:
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442 def cloneNode(self):
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parents:
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443 tag = self.soup.new_tag(self.element.name, self.namespace)
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parents:
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444 node = Element(tag, self.soup, self.namespace)
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guerler
parents:
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445 for key,value in self.attributes:
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parents:
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446 node.attributes[key] = value
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parents:
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447 return node
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parents:
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448
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parents:
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449 def hasContent(self):
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parents:
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450 return self.element.contents
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parents:
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451
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parents:
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452 def getNameTuple(self):
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guerler
parents:
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453 if self.namespace == None:
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parents:
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454 return namespaces["html"], self.name
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
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455 else:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
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456 return self.namespace, self.name
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
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457
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parents:
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458 nameTuple = property(getNameTuple)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
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459
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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460 class TextNode(Element):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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461 def __init__(self, element, soup):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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462 treebuilder_base.Node.__init__(self, None)
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guerler
parents:
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463 self.element = element
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parents:
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464 self.soup = soup
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parents:
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465
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
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466 def cloneNode(self):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
467 raise NotImplementedError