Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/bleach/_vendor/html5lib/treewalkers/__init__.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 """A collection of modules for iterating through different kinds of |
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2 tree, generating tokens identical to those produced by the tokenizer |
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3 module. |
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4 |
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5 To create a tree walker for a new type of tree, you need to |
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6 implement a tree walker object (called TreeWalker by convention) that |
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7 implements a 'serialize' method which takes a tree as sole argument and |
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8 returns an iterator which generates tokens. |
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9 """ |
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10 |
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11 from __future__ import absolute_import, division, unicode_literals |
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12 |
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13 from .. import constants |
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14 from .._utils import default_etree |
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15 |
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16 __all__ = ["getTreeWalker", "pprint"] |
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17 |
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18 treeWalkerCache = {} |
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19 |
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20 |
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21 def getTreeWalker(treeType, implementation=None, **kwargs): |
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22 """Get a TreeWalker class for various types of tree with built-in support |
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23 |
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24 :arg str treeType: the name of the tree type required (case-insensitive). |
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25 Supported values are: |
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26 |
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27 * "dom": The xml.dom.minidom DOM implementation |
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28 * "etree": A generic walker for tree implementations exposing an |
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29 elementtree-like interface (known to work with ElementTree, |
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30 cElementTree and lxml.etree). |
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31 * "lxml": Optimized walker for lxml.etree |
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32 * "genshi": a Genshi stream |
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33 |
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34 :arg implementation: A module implementing the tree type e.g. |
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35 xml.etree.ElementTree or cElementTree (Currently applies to the "etree" |
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36 tree type only). |
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37 |
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38 :arg kwargs: keyword arguments passed to the etree walker--for other |
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39 walkers, this has no effect |
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40 |
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41 :returns: a TreeWalker class |
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42 |
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43 """ |
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44 |
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45 treeType = treeType.lower() |
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46 if treeType not in treeWalkerCache: |
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47 if treeType == "dom": |
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48 from . import dom |
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49 treeWalkerCache[treeType] = dom.TreeWalker |
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50 elif treeType == "genshi": |
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51 from . import genshi |
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52 treeWalkerCache[treeType] = genshi.TreeWalker |
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53 elif treeType == "lxml": |
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54 from . import etree_lxml |
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55 treeWalkerCache[treeType] = etree_lxml.TreeWalker |
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56 elif treeType == "etree": |
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57 from . import etree |
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58 if implementation is None: |
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59 implementation = default_etree |
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60 # XXX: NEVER cache here, caching is done in the etree submodule |
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61 return etree.getETreeModule(implementation, **kwargs).TreeWalker |
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62 return treeWalkerCache.get(treeType) |
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63 |
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64 |
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65 def concatenateCharacterTokens(tokens): |
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66 pendingCharacters = [] |
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67 for token in tokens: |
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68 type = token["type"] |
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69 if type in ("Characters", "SpaceCharacters"): |
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70 pendingCharacters.append(token["data"]) |
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71 else: |
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72 if pendingCharacters: |
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73 yield {"type": "Characters", "data": "".join(pendingCharacters)} |
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74 pendingCharacters = [] |
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75 yield token |
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76 if pendingCharacters: |
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77 yield {"type": "Characters", "data": "".join(pendingCharacters)} |
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78 |
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79 |
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80 def pprint(walker): |
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81 """Pretty printer for tree walkers |
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82 |
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83 Takes a TreeWalker instance and pretty prints the output of walking the tree. |
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84 |
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85 :arg walker: a TreeWalker instance |
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86 |
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87 """ |
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88 output = [] |
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89 indent = 0 |
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90 for token in concatenateCharacterTokens(walker): |
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91 type = token["type"] |
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92 if type in ("StartTag", "EmptyTag"): |
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93 # tag name |
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94 if token["namespace"] and token["namespace"] != constants.namespaces["html"]: |
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95 if token["namespace"] in constants.prefixes: |
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96 ns = constants.prefixes[token["namespace"]] |
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97 else: |
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98 ns = token["namespace"] |
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99 name = "%s %s" % (ns, token["name"]) |
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100 else: |
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101 name = token["name"] |
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102 output.append("%s<%s>" % (" " * indent, name)) |
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103 indent += 2 |
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104 # attributes (sorted for consistent ordering) |
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105 attrs = token["data"] |
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106 for (namespace, localname), value in sorted(attrs.items()): |
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107 if namespace: |
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108 if namespace in constants.prefixes: |
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109 ns = constants.prefixes[namespace] |
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110 else: |
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111 ns = namespace |
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112 name = "%s %s" % (ns, localname) |
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113 else: |
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114 name = localname |
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115 output.append("%s%s=\"%s\"" % (" " * indent, name, value)) |
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116 # self-closing |
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117 if type == "EmptyTag": |
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118 indent -= 2 |
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119 |
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120 elif type == "EndTag": |
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121 indent -= 2 |
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122 |
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123 elif type == "Comment": |
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124 output.append("%s<!-- %s -->" % (" " * indent, token["data"])) |
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125 |
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126 elif type == "Doctype": |
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127 if token["name"]: |
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128 if token["publicId"]: |
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129 output.append("""%s<!DOCTYPE %s "%s" "%s">""" % |
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130 (" " * indent, |
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131 token["name"], |
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132 token["publicId"], |
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133 token["systemId"] if token["systemId"] else "")) |
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134 elif token["systemId"]: |
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135 output.append("""%s<!DOCTYPE %s "" "%s">""" % |
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136 (" " * indent, |
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137 token["name"], |
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138 token["systemId"])) |
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139 else: |
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140 output.append("%s<!DOCTYPE %s>" % (" " * indent, |
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141 token["name"])) |
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142 else: |
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143 output.append("%s<!DOCTYPE >" % (" " * indent,)) |
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144 |
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145 elif type == "Characters": |
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146 output.append("%s\"%s\"" % (" " * indent, token["data"])) |
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147 |
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148 elif type == "SpaceCharacters": |
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149 assert False, "concatenateCharacterTokens should have got rid of all Space tokens" |
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150 |
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151 else: |
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152 raise ValueError("Unknown token type, %s" % type) |
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153 |
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154 return "\n".join(output) |