.. wxPython Phoenix documentation
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Copyright: (c) 2011-2018 by Total Control Software
License: wxWindows License
.. include:: headings.inc
.. _wx.xml.XmlDocument:
==========================================================================================================================================
|phoenix_title| **wx.xml.XmlDocument**
==========================================================================================================================================
This class holds ``XML`` data/document as parsed by ``XML`` parser in the root node.
:ref:`wx.xml.XmlDocument` internally uses the expat library which comes with wxWidgets to parse the given stream.
A simple example of using ``XML`` classes is:
::
def ScanDocument():
doc = wx.xml.XmlDocument()
if not doc.Load("myfile.xml"):
return False
# start processing the XML file
if doc.GetRoot().GetName() != "myroot-node":
return False
# examine prologue
prolog = doc.GetDocumentNode().GetChildren()
while prolog:
if prolog.GetType() == wx.xml.XML_PI_NODE and prolog.GetName() == "target":
# process Process Instruction contents
pi = prolog.GetContent()
# Other code here...
child = doc.GetRoot().GetChildren()
while child:
if child.GetName() == "tag1":
# process text enclosed by tag1/tag1
content = child.GetNodeContent()
# Other code here...
# process attributes of tag1
attrvalue1 = child.GetAttribute("attr1", "default-value")
attrvalue2 = child.GetAttribute("attr2", "default-value")
elif child.GetName() == "tag2":
# process tag2 ...
attrvalue3 = child.GetAttribute("attr3", "default-value")
child = child.GetNext()
Note that if you want to preserve the original formatting of the loaded file including whitespaces and indentation, you need to turn off whitespace-only textnode removal and automatic indentation:
::
doc = wx.xml.XmlDocument()
doc.Load("myfile.xml", "UTF-8", wx.xml.XMLDOC_KEEP_WHITESPACE_NODES)
# myfile2.xml will be identical to myfile.xml saving it self way:
doc.Save("myfile2.xml", wx.xml.XML_NO_INDENTATION)
Using default parameters, you will get a reformatted document which in general is different from the original loaded content:
::
doc = wx.xml.XmlDocument()
doc.Load("myfile.xml")
doc.Save("myfile2.xml") # myfile2.xml != myfile.xml
.. seealso:: :ref:`wx.xml.XmlNode`, :ref:`wx.xml.XmlAttribute`
|
|class_hierarchy| Class Hierarchy
=================================
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<img id="toggleBlock-trigger" src="_static/images/closed.png"/>
Inheritance diagram for class <strong>XmlDocument</strong>:
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<div id="toggleBlock-content" style="display:none;">
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<center><img src="_static/images/inheritance/wx.xml.XmlDocument_inheritance.png" alt="Inheritance diagram of XmlDocument" usemap="#dummy" class="inheritance"/></center>
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<map id="dummy" name="dummy"> <area shape="rect" id="node1" href="wx.xml.XmlDocument.html" title="This class holds ``XML`` data/document as parsed by ``XML`` parser in the root node." alt="" coords="5,83,175,112"/> <area shape="rect" id="node2" href="wx.Object.html" title="This is the root class of many of the wxWidgets classes." alt="" coords="46,5,134,35"/> </map>
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|
|method_summary| Methods Summary
================================
================================================================================ ================================================================================
:meth:`~wx.xml.XmlDocument.__init__` Default constructor.
:meth:`~wx.xml.XmlDocument.AppendToProlog` Appends a Process Instruction or Comment node to the document prologue.
:meth:`~wx.xml.XmlDocument.DetachDocumentNode` Detaches the document node and returns it.
:meth:`~wx.xml.XmlDocument.DetachRoot` Detaches the root entity node and returns it.
:meth:`~wx.xml.XmlDocument.GetDocumentNode` Returns the document node of the document.
:meth:`~wx.xml.XmlDocument.GetFileEncoding` Returns encoding of document (may be empty).
:meth:`~wx.xml.XmlDocument.GetLibraryVersionInfo` Get expat library version information.
:meth:`~wx.xml.XmlDocument.GetRoot` Returns the root element node of the document.
:meth:`~wx.xml.XmlDocument.GetVersion` Returns the version of document.
:meth:`~wx.xml.XmlDocument.IsOk` Returns ``True`` if the document has been loaded successfully.
:meth:`~wx.xml.XmlDocument.Load` Parses `filename` as an xml document and loads its data.
:meth:`~wx.xml.XmlDocument.Save` Saves ``XML`` tree creating a file named with given string.
:meth:`~wx.xml.XmlDocument.SetDocumentNode` Sets the document node of this document.
:meth:`~wx.xml.XmlDocument.SetFileEncoding` Sets the encoding of the file which will be used to save the document.
:meth:`~wx.xml.XmlDocument.SetRoot` Sets the root element node of this document.
:meth:`~wx.xml.XmlDocument.SetVersion` Sets the version of the ``XML`` file which will be used to save the document.
================================================================================ ================================================================================
|
|property_summary| Properties Summary
=====================================
================================================================================ ================================================================================
:attr:`~wx.xml.XmlDocument.DocumentNode` See :meth:`~wx.xml.XmlDocument.GetDocumentNode` and :meth:`~wx.xml.XmlDocument.SetDocumentNode`
:attr:`~wx.xml.XmlDocument.FileEncoding` See :meth:`~wx.xml.XmlDocument.GetFileEncoding` and :meth:`~wx.xml.XmlDocument.SetFileEncoding`
:attr:`~wx.xml.XmlDocument.Root` See :meth:`~wx.xml.XmlDocument.GetRoot` and :meth:`~wx.xml.XmlDocument.SetRoot`
:attr:`~wx.xml.XmlDocument.Version` See :meth:`~wx.xml.XmlDocument.GetVersion` and :meth:`~wx.xml.XmlDocument.SetVersion`
================================================================================ ================================================================================
|
|api| Class API
===============
.. class:: wx.xml.XmlDocument(Object)
**Possible constructors**::
XmlDocument()
XmlDocument(doc)
XmlDocument(filename, encoding="UTF-8")
XmlDocument(stream, encoding="UTF-8")
This class holds ``XML`` data/document as parsed by ``XML`` parser in the root
node.
.. method:: __init__(self, *args, **kw)
|overload| Overloaded Implementations:
:html:`<hr class="overloadsep" /><br />`
**__init__** `(self)`
Default constructor.
:html:`<hr class="overloadsep" /><br />`
**__init__** `(self, doc)`
Copy constructor.
Deep copies all the ``XML`` tree of the given document.
:param `doc`:
:type `doc`: wx.xml.XmlDocument
:html:`<hr class="overloadsep" /><br />`
**__init__** `(self, filename, encoding="UTF-8")`
Loads the given filename using the given encoding.
See :meth:`Load` .
:param `filename`:
:type `filename`: string
:param `encoding`:
:type `encoding`: string
:html:`<hr class="overloadsep" /><br />`
**__init__** `(self, stream, encoding="UTF-8")`
Loads the ``XML`` document from given stream using the given encoding.
See :meth:`Load` .
:param `stream`:
:type `stream`: wx.InputStream
:param `encoding`:
:type `encoding`: string
:html:`<hr class="overloadsep" /><br />`
.. method:: AppendToProlog(self, node)
Appends a Process Instruction or Comment node to the document prologue.
Calling this function will create a prologue or attach the node to the end of an existing prologue.
:param `node`:
:type `node`: wx.xml.XmlNode
.. versionadded:: 2.9.2
.. method:: DetachDocumentNode(self)
Detaches the document node and returns it.
The document node will be set to ``None`` and thus :meth:`IsOk` will return ``False`` after calling this function.
Note that the caller is responsible for deleting the returned node in order to avoid memory leaks.
:rtype: :ref:`wx.xml.XmlNode`
.. versionadded:: 2.9.2
.. method:: DetachRoot(self)
Detaches the root entity node and returns it.
After calling this function, the document node will remain together with any prologue nodes, but :meth:`IsOk` will return ``False`` since the root entity will be missing.
Note that the caller is responsible for deleting the returned node in order to avoid memory leaks.
:rtype: :ref:`wx.xml.XmlNode`
.. method:: GetDocumentNode(self)
Returns the document node of the document.
:rtype: :ref:`wx.xml.XmlNode`
.. versionadded:: 2.9.2
.. method:: GetFileEncoding(self)
Returns encoding of document (may be empty).
:rtype: `string`
.. note::
This is the encoding original file was saved in, **not** the encoding of in-memory representation!
.. staticmethod:: GetLibraryVersionInfo()
Get expat library version information.
:rtype: `VersionInfo`
.. versionadded:: 2.9.2
.. seealso:: :ref:`wx.VersionInfo`
.. method:: GetRoot(self)
Returns the root element node of the document.
:rtype: :ref:`wx.xml.XmlNode`
.. method:: GetVersion(self)
Returns the version of document.
This is the value in the ``<`` ?xml version="1.0"?> header of the ``XML`` document. If the version attribute was not explicitly given in the header, this function returns an empty string.
:rtype: `string`
.. method:: IsOk(self)
Returns ``True`` if the document has been loaded successfully.
:rtype: `bool`
.. method:: Load(self, *args, **kw)
|overload| Overloaded Implementations:
:html:`<hr class="overloadsep" /><br />`
**Load** `(self, filename, encoding="UTF-8", flags=XMLDOC_NONE)`
Parses `filename` as an xml document and loads its data.
If `flags` does not contain ``wx.xml.XMLDOC_KEEP_WHITESPACE_NODES``, then, while loading, all nodes of type ``XML_TEXT_NODE`` (see :ref:`wx.xml.XmlNode`) are automatically skipped if they contain whitespaces only.
The removal of these nodes makes the load process slightly faster and requires less memory however makes impossible to recreate exactly the loaded text with a :meth:`Save` call later. Read the initial description of this class for more info.
Returns ``True`` on success, ``False`` otherwise.
:param `filename`:
:type `filename`: string
:param `encoding`:
:type `encoding`: string
:param `flags`:
:type `flags`: int
:rtype: `bool`
:html:`<hr class="overloadsep" /><br />`
**Load** `(self, stream, encoding="UTF-8", flags=XMLDOC_NONE)`
Like :meth:`Load` but takes the data from given input stream.
:param `stream`:
:type `stream`: wx.InputStream
:param `encoding`:
:type `encoding`: string
:param `flags`:
:type `flags`: int
:rtype: `bool`
:html:`<hr class="overloadsep" /><br />`
.. method:: Save(self, *args, **kw)
|overload| Overloaded Implementations:
:html:`<hr class="overloadsep" /><br />`
**Save** `(self, filename, indentstep=2)`
Saves ``XML`` tree creating a file named with given string.
If `indentstep` is greater than or equal to zero, then, while saving, an automatic indentation is added with steps composed by indentstep spaces.
If `indentstep` is ``XML_NO_INDENTATION`` , then, automatic indentation is turned off.
:param `filename`:
:type `filename`: string
:param `indentstep`:
:type `indentstep`: int
:rtype: `bool`
:html:`<hr class="overloadsep" /><br />`
**Save** `(self, stream, indentstep=2)`
Saves ``XML`` tree in the given output stream.
See Save(const String&, int) for a description of `indentstep`.
:param `stream`:
:type `stream`: wx.OutputStream
:param `indentstep`:
:type `indentstep`: int
:rtype: `bool`
:html:`<hr class="overloadsep" /><br />`
.. method:: SetDocumentNode(self, node)
Sets the document node of this document.
Deletes any previous document node. Use :meth:`DetachDocumentNode` and then :meth:`SetDocumentNode` if you want to replace the document node without deleting the old document tree.
:param `node`:
:type `node`: wx.xml.XmlNode
.. versionadded:: 2.9.2
.. method:: SetFileEncoding(self, encoding)
Sets the encoding of the file which will be used to save the document.
:param `encoding`:
:type `encoding`: string
.. method:: SetRoot(self, node)
Sets the root element node of this document.
Will create the document node if necessary. Any previous root element node is deleted.
:param `node`:
:type `node`: wx.xml.XmlNode
.. method:: SetVersion(self, version)
Sets the version of the ``XML`` file which will be used to save the document.
:param `version`:
:type `version`: string
.. attribute:: DocumentNode
See :meth:`~wx.xml.XmlDocument.GetDocumentNode` and :meth:`~wx.xml.XmlDocument.SetDocumentNode`
.. attribute:: FileEncoding
See :meth:`~wx.xml.XmlDocument.GetFileEncoding` and :meth:`~wx.xml.XmlDocument.SetFileEncoding`
.. attribute:: Root
See :meth:`~wx.xml.XmlDocument.GetRoot` and :meth:`~wx.xml.XmlDocument.SetRoot`
.. attribute:: Version
See :meth:`~wx.xml.XmlDocument.GetVersion` and :meth:`~wx.xml.XmlDocument.SetVersion`