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Commit ba71cb9

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Merge DocumentFragment.py into interface.py
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‎w3/python/core/fundamental_interface/DocumentFragment.py

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‎w3/python/core/interface.py

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from w3.python.core.type import DOMString
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from w3.python.core.fundamental_interface.Node import Node
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from w3.python.core.fundamental_interface.Node import NodeType
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from w3.python.typing import _Document
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class DOMImplementation:
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This method raises no exceptions.
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"""
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raise NotImplementedError
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class DocumentFragment(Node):
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"""Interface `DocumentFragment`
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`DocumentFragment` is a "lightweight" or "minimal" `Document` object.
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It is very common to want to be able to extract a portion of a document's tree or to create a new fragment of a document.
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Imagine implementing a user command like cut or rearranging a document by moving fragments around.
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It is desirable to have an object which can hold such fragments and it is quite natural to use a `Node` for this purpose.
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While it is true that a `Document` object could fulfil this role, a `Document` object can potentially be a heavyweight object, depending on the underlying implementation.
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What is really needed for this is a very lightweight object.
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`DocumentFragment` is such an object.
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Furthermore, various operations -- such as inserting nodes as children of another `Node` -- may take `DocumentFragment` objects as arguments; this results in all the child nodes of the `DocumentFragment` being moved to the child list of this node.
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The children of a `DocumentFragment` node are zero or more nodes representing the tops of any sub-trees defining the structure of the document.
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`DocumentFragment` nodes do not need to be well-formed XML documents (although they do need to follow the rules imposed upon well-formed XML parsed entities, which can have multiple top nodes).
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For example, a `DocumentFragment` might have only one child and that child node could be a `Text` node.
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Such a structure model represents neither an HTML document nor a well-formed XML document.
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When a `DocumentFragment` is inserted into a `Document` (or indeed any other `Node` that may take children) the children of the `DocumentFragment` and not the `DocumentFragment` itself are inserted into the `Node`.
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This makes the `DocumentFragment` very useful when the user wishes to create nodes that are siblings; the `DocumentFragment` acts as the parent of these nodes so that the user can use the standard methods from the `Node` interface, such as `insertBefore()` and `appendChild()`.
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"""
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def __init__(self,
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owner_document: _Document,
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read_only: bool = False) -> None:
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super().__init__(owner_document=owner_document,
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node_type=NodeType.DOCUMENT_FRAGMENT_NODE,
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node_name='#document-fragment',
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node_value=None,
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read_only=read_only)

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