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annotate env/lib/python3.9/site-packages/lxml/html/soupparser.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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0
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1 """External interface to the BeautifulSoup HTML parser.
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2 """
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3
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4 __all__ = ["fromstring", "parse", "convert_tree"]
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5
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6 import re
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7 from lxml import etree, html
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8
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9 try:
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10 from bs4 import (
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11 BeautifulSoup, Tag, Comment, ProcessingInstruction, NavigableString,
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12 Declaration, Doctype)
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13 _DECLARATION_OR_DOCTYPE = (Declaration, Doctype)
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14 except ImportError:
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15 from BeautifulSoup import (
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16 BeautifulSoup, Tag, Comment, ProcessingInstruction, NavigableString,
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17 Declaration)
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18 _DECLARATION_OR_DOCTYPE = Declaration
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19
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20
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21 def fromstring(data, beautifulsoup=None, makeelement=None, **bsargs):
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22 """Parse a string of HTML data into an Element tree using the
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23 BeautifulSoup parser.
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24
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25 Returns the root ``<html>`` Element of the tree.
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26
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27 You can pass a different BeautifulSoup parser through the
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28 `beautifulsoup` keyword, and a diffent Element factory function
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29 through the `makeelement` keyword. By default, the standard
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30 ``BeautifulSoup`` class and the default factory of `lxml.html` are
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31 used.
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32 """
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33 return _parse(data, beautifulsoup, makeelement, **bsargs)
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34
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35
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36 def parse(file, beautifulsoup=None, makeelement=None, **bsargs):
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37 """Parse a file into an ElemenTree using the BeautifulSoup parser.
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38
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39 You can pass a different BeautifulSoup parser through the
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40 `beautifulsoup` keyword, and a diffent Element factory function
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41 through the `makeelement` keyword. By default, the standard
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42 ``BeautifulSoup`` class and the default factory of `lxml.html` are
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43 used.
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44 """
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45 if not hasattr(file, 'read'):
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46 file = open(file)
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47 root = _parse(file, beautifulsoup, makeelement, **bsargs)
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48 return etree.ElementTree(root)
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49
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50
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51 def convert_tree(beautiful_soup_tree, makeelement=None):
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52 """Convert a BeautifulSoup tree to a list of Element trees.
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53
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54 Returns a list instead of a single root Element to support
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55 HTML-like soup with more than one root element.
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56
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57 You can pass a different Element factory through the `makeelement`
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58 keyword.
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59 """
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60 root = _convert_tree(beautiful_soup_tree, makeelement)
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61 children = root.getchildren()
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62 for child in children:
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63 root.remove(child)
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64 return children
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65
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66
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67 # helpers
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68
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69 def _parse(source, beautifulsoup, makeelement, **bsargs):
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70 if beautifulsoup is None:
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71 beautifulsoup = BeautifulSoup
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72 if hasattr(beautifulsoup, "HTML_ENTITIES"): # bs3
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73 if 'convertEntities' not in bsargs:
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74 bsargs['convertEntities'] = 'html'
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75 if hasattr(beautifulsoup, "DEFAULT_BUILDER_FEATURES"): # bs4
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76 if 'features' not in bsargs:
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77 bsargs['features'] = 'html.parser' # use Python html parser
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78 tree = beautifulsoup(source, **bsargs)
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79 root = _convert_tree(tree, makeelement)
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80 # from ET: wrap the document in a html root element, if necessary
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81 if len(root) == 1 and root[0].tag == "html":
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82 return root[0]
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83 root.tag = "html"
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84 return root
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85
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86
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87 _parse_doctype_declaration = re.compile(
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88 r'(?:\s|[<!])*DOCTYPE\s*HTML'
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89 r'(?:\s+PUBLIC)?(?:\s+(\'[^\']*\'|"[^"]*"))?'
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90 r'(?:\s+(\'[^\']*\'|"[^"]*"))?',
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91 re.IGNORECASE).match
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92
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93
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94 class _PseudoTag:
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95 # Minimal imitation of BeautifulSoup.Tag
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96 def __init__(self, contents):
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97 self.name = 'html'
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98 self.attrs = []
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99 self.contents = contents
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100
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101 def __iter__(self):
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102 return self.contents.__iter__()
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103
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104
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105 def _convert_tree(beautiful_soup_tree, makeelement):
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106 if makeelement is None:
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107 makeelement = html.html_parser.makeelement
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108
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109 # Split the tree into three parts:
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110 # i) everything before the root element: document type
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111 # declaration, comments, processing instructions, whitespace
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112 # ii) the root(s),
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113 # iii) everything after the root: comments, processing
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114 # instructions, whitespace
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115 first_element_idx = last_element_idx = None
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116 html_root = declaration = None
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117 for i, e in enumerate(beautiful_soup_tree):
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118 if isinstance(e, Tag):
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119 if first_element_idx is None:
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120 first_element_idx = i
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121 last_element_idx = i
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122 if html_root is None and e.name and e.name.lower() == 'html':
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123 html_root = e
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124 elif declaration is None and isinstance(e, _DECLARATION_OR_DOCTYPE):
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125 declaration = e
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126
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127 # For a nice, well-formatted document, the variable roots below is
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128 # a list consisting of a single <html> element. However, the document
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129 # may be a soup like '<meta><head><title>Hello</head><body>Hi
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130 # all<\p>'. In this example roots is a list containing meta, head
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131 # and body elements.
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132 if first_element_idx is None:
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133 pre_root = post_root = []
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134 roots = beautiful_soup_tree.contents
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135 else:
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136 pre_root = beautiful_soup_tree.contents[:first_element_idx]
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137 roots = beautiful_soup_tree.contents[first_element_idx:last_element_idx+1]
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138 post_root = beautiful_soup_tree.contents[last_element_idx+1:]
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139
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140 # Reorganize so that there is one <html> root...
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141 if html_root is not None:
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142 # ... use existing one if possible, ...
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143 i = roots.index(html_root)
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144 html_root.contents = roots[:i] + html_root.contents + roots[i+1:]
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145 else:
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146 # ... otherwise create a new one.
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147 html_root = _PseudoTag(roots)
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148
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149 convert_node = _init_node_converters(makeelement)
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150
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151 # Process pre_root
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152 res_root = convert_node(html_root)
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153 prev = res_root
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154 for e in reversed(pre_root):
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155 converted = convert_node(e)
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156 if converted is not None:
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157 prev.addprevious(converted)
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158 prev = converted
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159
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160 # ditto for post_root
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161 prev = res_root
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162 for e in post_root:
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163 converted = convert_node(e)
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164 if converted is not None:
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165 prev.addnext(converted)
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166 prev = converted
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167
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168 if declaration is not None:
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169 try:
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170 # bs4 provides full Doctype string
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171 doctype_string = declaration.output_ready()
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172 except AttributeError:
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173 doctype_string = declaration.string
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174
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175 match = _parse_doctype_declaration(doctype_string)
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176 if not match:
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177 # Something is wrong if we end up in here. Since soupparser should
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178 # tolerate errors, do not raise Exception, just let it pass.
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179 pass
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180 else:
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181 external_id, sys_uri = match.groups()
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182 docinfo = res_root.getroottree().docinfo
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183 # strip quotes and update DOCTYPE values (any of None, '', '...')
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184 docinfo.public_id = external_id and external_id[1:-1]
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185 docinfo.system_url = sys_uri and sys_uri[1:-1]
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186
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187 return res_root
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188
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189
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190 def _init_node_converters(makeelement):
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191 converters = {}
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192 ordered_node_types = []
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193
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194 def converter(*types):
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195 def add(handler):
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196 for t in types:
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197 converters[t] = handler
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198 ordered_node_types.append(t)
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199 return handler
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200 return add
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201
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202 def find_best_converter(node):
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203 for t in ordered_node_types:
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204 if isinstance(node, t):
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205 return converters[t]
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206 return None
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207
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208 def convert_node(bs_node, parent=None):
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209 # duplicated in convert_tag() below
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210 try:
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211 handler = converters[type(bs_node)]
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212 except KeyError:
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213 handler = converters[type(bs_node)] = find_best_converter(bs_node)
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214 if handler is None:
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215 return None
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216 return handler(bs_node, parent)
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217
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218 def map_attrs(bs_attrs):
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219 if isinstance(bs_attrs, dict): # bs4
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220 attribs = {}
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221 for k, v in bs_attrs.items():
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222 if isinstance(v, list):
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223 v = " ".join(v)
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224 attribs[k] = unescape(v)
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225 else:
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226 attribs = dict((k, unescape(v)) for k, v in bs_attrs)
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227 return attribs
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228
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229 def append_text(parent, text):
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230 if len(parent) == 0:
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231 parent.text = (parent.text or '') + text
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232 else:
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233 parent[-1].tail = (parent[-1].tail or '') + text
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234
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235 # converters are tried in order of their definition
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236
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237 @converter(Tag, _PseudoTag)
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238 def convert_tag(bs_node, parent):
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239 attrs = bs_node.attrs
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240 if parent is not None:
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241 attribs = map_attrs(attrs) if attrs else None
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242 res = etree.SubElement(parent, bs_node.name, attrib=attribs)
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243 else:
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244 attribs = map_attrs(attrs) if attrs else {}
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245 res = makeelement(bs_node.name, attrib=attribs)
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246
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247 for child in bs_node:
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248 # avoid double recursion by inlining convert_node(), see above
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249 try:
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250 handler = converters[type(child)]
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251 except KeyError:
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252 pass
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253 else:
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254 if handler is not None:
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255 handler(child, res)
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256 continue
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257 convert_node(child, res)
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258 return res
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259
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260 @converter(Comment)
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261 def convert_comment(bs_node, parent):
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262 res = html.HtmlComment(bs_node)
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263 if parent is not None:
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264 parent.append(res)
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265 return res
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266
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267 @converter(ProcessingInstruction)
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268 def convert_pi(bs_node, parent):
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269 if bs_node.endswith('?'):
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270 # The PI is of XML style (<?as df?>) but BeautifulSoup
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271 # interpreted it as being SGML style (<?as df>). Fix.
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272 bs_node = bs_node[:-1]
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273 res = etree.ProcessingInstruction(*bs_node.split(' ', 1))
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274 if parent is not None:
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275 parent.append(res)
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276 return res
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277
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278 @converter(NavigableString)
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279 def convert_text(bs_node, parent):
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280 if parent is not None:
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281 append_text(parent, unescape(bs_node))
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282 return None
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283
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284 return convert_node
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285
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286
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287 # copied from ET's ElementSoup
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288
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289 try:
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290 from html.entities import name2codepoint # Python 3
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291 except ImportError:
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292 from htmlentitydefs import name2codepoint
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293
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294
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295 handle_entities = re.compile(r"&(\w+);").sub
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296
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297
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298 try:
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299 unichr
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300 except NameError:
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301 # Python 3
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302 unichr = chr
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303
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304
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305 def unescape(string):
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306 if not string:
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307 return ''
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308 # work around oddities in BeautifulSoup's entity handling
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309 def unescape_entity(m):
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310 try:
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311 return unichr(name2codepoint[m.group(1)])
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312 except KeyError:
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313 return m.group(0) # use as is
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314 return handle_entities(unescape_entity, string)