Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/gumbo-parser/python/gumbo/html5lib_adapter.py @ 39:a6bc019ac0b2 upstream

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ADD: PyMuPDF v1.26.5: the original sdist.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:19:58 +0200
parents b50eed0cc0ef
children
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b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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1 # Copyright 2012 Google Inc. All Rights Reserved.
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2 #
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3 # Licensed under the Apache License, Version 2.0 (the "License");
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4 # you may not use this file except in compliance with the License.
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5 # You may obtain a copy of the License at
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6 #
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7 # http://www.apache.org/licenses/LICENSE-2.0
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8 #
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9 # Unless required by applicable law or agreed to in writing, software
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10 # distributed under the License is distributed on an "AS IS" BASIS,
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11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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12 # See the License for the specific language governing permissions and
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13 # limitations under the License.
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14 #
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15 """Adapter between Gumbo and html5lib.
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17 This exports one method, parse, with the same signature as html5lib.parse. It
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18 takes the text to parse, and optionally an html5lib TreeBuilder to build the
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19 tree, and gives back a DOM tree in that format. Example:
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21 doc = parse(text, treebuilder='lxml')
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22 """
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24 __author__ = 'jdtang@google.com (Jonathan Tang)'
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26 import gumboc
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28 # These should match html5lib.constants.namespaces, and be indexed by the enum
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29 # values of gumboc.Namespace
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30 _NAMESPACES = [
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31 'http://www.w3.org/1999/xhtml',
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32 'http://www.w3.org/2000/svg',
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33 'http://www.w3.org/1998/Math/MathML',
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34 ]
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36
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37 def _convert_doctype(treebuilder, source_node):
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38 if not source_node.has_doctype:
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39 # Mimic html5lib behavior: if no doctype token, no doctype node.
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40 return
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41 treebuilder.insertDoctype({
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42 'name': source_node.name.decode('utf-8'),
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43 'publicId': source_node.public_identifier.decode('utf-8'),
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44 'systemId': source_node.system_identifier.decode('utf-8'),
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45 })
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48 def _convert_attributes(source_node):
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49 def maybe_namespace(attr):
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50 if attr.namespace != gumboc.AttributeNamespace.NONE:
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51 return (repr(attr.namespace).lower() if attr.name != 'xmlns' else None,
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52 attr.name.decode('utf-8'),
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53 attr.namespace.to_url())
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54 else:
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55 return attr.name.decode('utf-8')
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56 return dict((maybe_namespace(attr), attr.value.decode('utf-8'))
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57 for attr in source_node.attributes)
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58
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59
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60 def _convert_element(source_node):
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61 if source_node.type not in ( gumboc.NodeType.ELEMENT, gumboc.NodeType.TEMPLATE):
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62 # If-statement instead of assert so it runs with -O
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63 raise AssertionError(
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64 '_convert_element only works with elements; found %r' %
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65 source_node.type)
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66 return {
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67 'name': source_node.v.element.tag_name.decode('utf-8'),
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68 'namespace': _NAMESPACES[source_node.v.element.tag_namespace.value],
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69 'data': _convert_attributes(source_node),
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70 }
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71
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72
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73 def _insert_root(treebuilder, source_node, pop_element = True):
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74 treebuilder.insertRoot(_convert_element(source_node))
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75 for child_node in source_node.children:
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76 _insert_node(treebuilder, child_node)
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77 if pop_element:
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78 treebuilder.openElements.pop()
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79
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80 def _insert_node(treebuilder, source_node):
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81 assert source_node.type != gumboc.NodeType.DOCUMENT
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82 if source_node.type == gumboc.NodeType.COMMENT:
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83 treebuilder.insertComment({'data': source_node.v.text.text.decode('utf-8')})
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84 elif source_node.type in (
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85 gumboc.NodeType.TEXT,
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86 gumboc.NodeType.WHITESPACE,
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87 gumboc.NodeType.CDATA):
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88 treebuilder.insertText(source_node.v.text.text.decode('utf-8'))
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89 else:
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90 treebuilder.insertElementNormal(_convert_element(source_node))
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91 for child_node in source_node.v.element.children:
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92 _insert_node(treebuilder, child_node)
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93 treebuilder.openElements.pop()
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94
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95
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96 class HTMLParser(object):
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97 def __init__(self, tree):
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98 self.tree = tree
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99
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100 def parse(self, text_or_file, **kwargs):
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101 try:
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102 text = text_or_file.read()
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103 except AttributeError:
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104 # Assume a string.
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105 text = text_or_file
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106
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107 with gumboc.parse(text, **kwargs) as output:
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108 _convert_doctype(self.tree, output.contents.document.contents)
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109 for node in output.contents.document.contents.children:
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110 if node.type == gumboc.NodeType.COMMENT:
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111 self.tree.insertComment({'data': node.v.text.text.decode('utf-8')},
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112 self.tree.document)
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113 elif node.type in (gumboc.NodeType.ELEMENT, gumboc.NodeType.TEMPLATE):
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114 _insert_root(self.tree, output.contents.root.contents)
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115 else:
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116 assert 'Only comments and <html> nodes allowed at the root'
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117 return self.tree.getDocument()
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118
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119 def parseFragment(self, text_or_file, container, **kwargs):
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120 try:
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121 text = text_or_file.read()
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122 except AttributeError:
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123 # Assume a string.
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124 text = text_or_file
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125 if ' ' in container:
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126 container_ns, container = container.split(' ')
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127 else:
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128 container_ns = "html"
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129
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130 with gumboc.parse(
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131 text,
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132 fragment_context=gumboc.Tag.from_str(container),
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133 fragment_namespace=getattr(gumboc.Namespace, container_ns.upper()),
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134 **kwargs) as output:
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135 for node in output.contents.document.contents.children:
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136 if node.type in (gumboc.NodeType.ELEMENT, gumboc.NodeType.TEMPLATE):
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137 _insert_root(self.tree, output.contents.root.contents, False)
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138 else:
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139 assert 'Malformed fragment parse (??)'
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140 return self.tree.getFragment()