U
��.e � @ s6 d Z ddlmZmZmZ ddlmZ i Zddd�ZdS ) a) A collection of modules for building different kinds of trees from HTML
documents.
To create a treebuilder for a new type of tree, you need to do
implement several things:
1. A set of classes for various types of elements: Document, Doctype, Comment,
Element. These must implement the interface of ``base.treebuilders.Node``
(although comment nodes have a different signature for their constructor,
see ``treebuilders.etree.Comment``) Textual content may also be implemented
as another node type, or not, as your tree implementation requires.
2. A treebuilder object (called ``TreeBuilder`` by convention) that inherits
from ``treebuilders.base.TreeBuilder``. This has 4 required attributes:
* ``documentClass`` - the class to use for the bottommost node of a document
* ``elementClass`` - the class to use for HTML Elements
* ``commentClass`` - the class to use for comments
* ``doctypeClass`` - the class to use for doctypes
It also has one required method:
* ``getDocument`` - Returns the root node of the complete document tree
3. If you wish to run the unit tests, you must also create a ``testSerializer``
method on your treebuilder which accepts a node and returns a string
containing Node and its children serialized according to the format used in
the unittests
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