Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/bleach/_vendor/html5lib/treewalkers/base.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 from __future__ import absolute_import, division, unicode_literals |
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2 |
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3 from xml.dom import Node |
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4 from ..constants import namespaces, voidElements, spaceCharacters |
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5 |
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6 __all__ = ["DOCUMENT", "DOCTYPE", "TEXT", "ELEMENT", "COMMENT", "ENTITY", "UNKNOWN", |
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7 "TreeWalker", "NonRecursiveTreeWalker"] |
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8 |
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9 DOCUMENT = Node.DOCUMENT_NODE |
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10 DOCTYPE = Node.DOCUMENT_TYPE_NODE |
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11 TEXT = Node.TEXT_NODE |
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12 ELEMENT = Node.ELEMENT_NODE |
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13 COMMENT = Node.COMMENT_NODE |
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14 ENTITY = Node.ENTITY_NODE |
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15 UNKNOWN = "<#UNKNOWN#>" |
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16 |
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17 spaceCharacters = "".join(spaceCharacters) |
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18 |
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19 |
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20 class TreeWalker(object): |
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21 """Walks a tree yielding tokens |
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22 |
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23 Tokens are dicts that all have a ``type`` field specifying the type of the |
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24 token. |
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25 |
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26 """ |
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27 def __init__(self, tree): |
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28 """Creates a TreeWalker |
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29 |
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30 :arg tree: the tree to walk |
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31 |
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32 """ |
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33 self.tree = tree |
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34 |
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35 def __iter__(self): |
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36 raise NotImplementedError |
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37 |
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38 def error(self, msg): |
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39 """Generates an error token with the given message |
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40 |
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41 :arg msg: the error message |
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42 |
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43 :returns: SerializeError token |
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44 |
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45 """ |
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46 return {"type": "SerializeError", "data": msg} |
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47 |
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48 def emptyTag(self, namespace, name, attrs, hasChildren=False): |
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49 """Generates an EmptyTag token |
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50 |
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51 :arg namespace: the namespace of the token--can be ``None`` |
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52 |
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53 :arg name: the name of the element |
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54 |
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55 :arg attrs: the attributes of the element as a dict |
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56 |
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57 :arg hasChildren: whether or not to yield a SerializationError because |
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58 this tag shouldn't have children |
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59 |
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60 :returns: EmptyTag token |
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61 |
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62 """ |
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63 yield {"type": "EmptyTag", "name": name, |
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64 "namespace": namespace, |
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65 "data": attrs} |
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66 if hasChildren: |
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67 yield self.error("Void element has children") |
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68 |
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69 def startTag(self, namespace, name, attrs): |
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70 """Generates a StartTag token |
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71 |
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72 :arg namespace: the namespace of the token--can be ``None`` |
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73 |
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74 :arg name: the name of the element |
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75 |
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76 :arg attrs: the attributes of the element as a dict |
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77 |
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78 :returns: StartTag token |
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79 |
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80 """ |
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81 return {"type": "StartTag", |
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82 "name": name, |
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83 "namespace": namespace, |
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84 "data": attrs} |
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85 |
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86 def endTag(self, namespace, name): |
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87 """Generates an EndTag token |
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88 |
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89 :arg namespace: the namespace of the token--can be ``None`` |
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90 |
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91 :arg name: the name of the element |
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92 |
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93 :returns: EndTag token |
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94 |
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95 """ |
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96 return {"type": "EndTag", |
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97 "name": name, |
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98 "namespace": namespace} |
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99 |
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100 def text(self, data): |
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101 """Generates SpaceCharacters and Characters tokens |
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102 |
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103 Depending on what's in the data, this generates one or more |
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104 ``SpaceCharacters`` and ``Characters`` tokens. |
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105 |
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106 For example: |
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107 |
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108 >>> from html5lib.treewalkers.base import TreeWalker |
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109 >>> # Give it an empty tree just so it instantiates |
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110 >>> walker = TreeWalker([]) |
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111 >>> list(walker.text('')) |
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112 [] |
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113 >>> list(walker.text(' ')) |
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114 [{u'data': ' ', u'type': u'SpaceCharacters'}] |
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115 >>> list(walker.text(' abc ')) # doctest: +NORMALIZE_WHITESPACE |
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116 [{u'data': ' ', u'type': u'SpaceCharacters'}, |
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117 {u'data': u'abc', u'type': u'Characters'}, |
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118 {u'data': u' ', u'type': u'SpaceCharacters'}] |
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119 |
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120 :arg data: the text data |
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121 |
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122 :returns: one or more ``SpaceCharacters`` and ``Characters`` tokens |
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123 |
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124 """ |
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125 data = data |
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126 middle = data.lstrip(spaceCharacters) |
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127 left = data[:len(data) - len(middle)] |
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128 if left: |
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129 yield {"type": "SpaceCharacters", "data": left} |
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130 data = middle |
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131 middle = data.rstrip(spaceCharacters) |
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132 right = data[len(middle):] |
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133 if middle: |
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134 yield {"type": "Characters", "data": middle} |
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135 if right: |
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136 yield {"type": "SpaceCharacters", "data": right} |
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137 |
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138 def comment(self, data): |
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139 """Generates a Comment token |
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140 |
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141 :arg data: the comment |
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142 |
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143 :returns: Comment token |
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144 |
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145 """ |
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146 return {"type": "Comment", "data": data} |
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147 |
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148 def doctype(self, name, publicId=None, systemId=None): |
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149 """Generates a Doctype token |
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150 |
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151 :arg name: |
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152 |
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153 :arg publicId: |
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154 |
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155 :arg systemId: |
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156 |
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157 :returns: the Doctype token |
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158 |
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159 """ |
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160 return {"type": "Doctype", |
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161 "name": name, |
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162 "publicId": publicId, |
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163 "systemId": systemId} |
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164 |
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165 def entity(self, name): |
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166 """Generates an Entity token |
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167 |
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168 :arg name: the entity name |
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169 |
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170 :returns: an Entity token |
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171 |
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172 """ |
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173 return {"type": "Entity", "name": name} |
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174 |
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175 def unknown(self, nodeType): |
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176 """Handles unknown node types""" |
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177 return self.error("Unknown node type: " + nodeType) |
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178 |
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179 |
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180 class NonRecursiveTreeWalker(TreeWalker): |
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181 def getNodeDetails(self, node): |
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182 raise NotImplementedError |
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183 |
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184 def getFirstChild(self, node): |
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185 raise NotImplementedError |
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186 |
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187 def getNextSibling(self, node): |
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188 raise NotImplementedError |
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189 |
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190 def getParentNode(self, node): |
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191 raise NotImplementedError |
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192 |
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193 def __iter__(self): |
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194 currentNode = self.tree |
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195 while currentNode is not None: |
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196 details = self.getNodeDetails(currentNode) |
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197 type, details = details[0], details[1:] |
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198 hasChildren = False |
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199 |
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200 if type == DOCTYPE: |
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201 yield self.doctype(*details) |
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202 |
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203 elif type == TEXT: |
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204 for token in self.text(*details): |
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205 yield token |
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206 |
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207 elif type == ELEMENT: |
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208 namespace, name, attributes, hasChildren = details |
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209 if (not namespace or namespace == namespaces["html"]) and name in voidElements: |
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210 for token in self.emptyTag(namespace, name, attributes, |
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211 hasChildren): |
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212 yield token |
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213 hasChildren = False |
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214 else: |
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215 yield self.startTag(namespace, name, attributes) |
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216 |
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217 elif type == COMMENT: |
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218 yield self.comment(details[0]) |
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219 |
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220 elif type == ENTITY: |
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221 yield self.entity(details[0]) |
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222 |
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223 elif type == DOCUMENT: |
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224 hasChildren = True |
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225 |
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226 else: |
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227 yield self.unknown(details[0]) |
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228 |
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229 if hasChildren: |
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230 firstChild = self.getFirstChild(currentNode) |
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231 else: |
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232 firstChild = None |
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233 |
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234 if firstChild is not None: |
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235 currentNode = firstChild |
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236 else: |
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237 while currentNode is not None: |
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238 details = self.getNodeDetails(currentNode) |
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239 type, details = details[0], details[1:] |
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240 if type == ELEMENT: |
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241 namespace, name, attributes, hasChildren = details |
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242 if (namespace and namespace != namespaces["html"]) or name not in voidElements: |
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243 yield self.endTag(namespace, name) |
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244 if self.tree is currentNode: |
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245 currentNode = None |
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246 break |
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247 nextSibling = self.getNextSibling(currentNode) |
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248 if nextSibling is not None: |
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249 currentNode = nextSibling |
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250 break |
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251 else: |
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252 currentNode = self.getParentNode(currentNode) |