Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/bleach/_vendor/html5lib/treebuilders/__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 building different kinds of trees from HTML |
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2 documents. |
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3 |
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4 To create a treebuilder for a new type of tree, you need to do |
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5 implement several things: |
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6 |
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7 1. A set of classes for various types of elements: Document, Doctype, Comment, |
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8 Element. These must implement the interface of ``base.treebuilders.Node`` |
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9 (although comment nodes have a different signature for their constructor, |
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10 see ``treebuilders.etree.Comment``) Textual content may also be implemented |
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11 as another node type, or not, as your tree implementation requires. |
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12 |
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13 2. A treebuilder object (called ``TreeBuilder`` by convention) that inherits |
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14 from ``treebuilders.base.TreeBuilder``. This has 4 required attributes: |
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15 |
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16 * ``documentClass`` - the class to use for the bottommost node of a document |
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17 * ``elementClass`` - the class to use for HTML Elements |
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18 * ``commentClass`` - the class to use for comments |
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19 * ``doctypeClass`` - the class to use for doctypes |
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20 |
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21 It also has one required method: |
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22 |
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23 * ``getDocument`` - Returns the root node of the complete document tree |
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24 |
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25 3. If you wish to run the unit tests, you must also create a ``testSerializer`` |
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26 method on your treebuilder which accepts a node and returns a string |
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27 containing Node and its children serialized according to the format used in |
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28 the unittests |
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29 |
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30 """ |
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31 |
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32 from __future__ import absolute_import, division, unicode_literals |
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33 |
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34 from .._utils import default_etree |
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35 |
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36 treeBuilderCache = {} |
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37 |
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38 |
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39 def getTreeBuilder(treeType, implementation=None, **kwargs): |
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40 """Get a TreeBuilder class for various types of trees with built-in support |
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41 |
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42 :arg treeType: the name of the tree type required (case-insensitive). Supported |
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43 values are: |
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44 |
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45 * "dom" - A generic builder for DOM implementations, defaulting to a |
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46 xml.dom.minidom based implementation. |
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47 * "etree" - A generic builder for tree implementations exposing an |
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48 ElementTree-like interface, defaulting to xml.etree.cElementTree if |
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49 available and xml.etree.ElementTree if not. |
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50 * "lxml" - A etree-based builder for lxml.etree, handling limitations |
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51 of lxml's implementation. |
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52 |
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53 :arg implementation: (Currently applies to the "etree" and "dom" tree |
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54 types). A module implementing the tree type e.g. xml.etree.ElementTree |
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55 or xml.etree.cElementTree. |
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56 |
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57 :arg kwargs: Any additional options to pass to the TreeBuilder when |
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58 creating it. |
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59 |
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60 Example: |
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61 |
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62 >>> from html5lib.treebuilders import getTreeBuilder |
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63 >>> builder = getTreeBuilder('etree') |
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64 |
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65 """ |
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66 |
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67 treeType = treeType.lower() |
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68 if treeType not in treeBuilderCache: |
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69 if treeType == "dom": |
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70 from . import dom |
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71 # Come up with a sane default (pref. from the stdlib) |
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72 if implementation is None: |
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73 from xml.dom import minidom |
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74 implementation = minidom |
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75 # NEVER cache here, caching is done in the dom submodule |
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76 return dom.getDomModule(implementation, **kwargs).TreeBuilder |
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77 elif treeType == "lxml": |
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78 from . import etree_lxml |
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79 treeBuilderCache[treeType] = etree_lxml.TreeBuilder |
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80 elif treeType == "etree": |
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81 from . import etree |
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82 if implementation is None: |
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83 implementation = default_etree |
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84 # NEVER cache here, caching is done in the etree submodule |
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85 return etree.getETreeModule(implementation, **kwargs).TreeBuilder |
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86 else: |
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87 raise ValueError("""Unrecognised treebuilder "%s" """ % treeType) |
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88 return treeBuilderCache.get(treeType) |