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96 lines
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ReStructuredText
96 lines
4 KiB
ReStructuredText
:mod:`xml.sax.saxutils` --- SAX Utilities
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=========================================
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.. module:: xml.sax.saxutils
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:synopsis: Convenience functions and classes for use with SAX.
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.. moduleauthor:: Lars Marius Garshol <larsga@garshol.priv.no>
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.. sectionauthor:: Martin v. Löwis <martin@v.loewis.de>
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**Source code:** :source:`Lib/xml/sax/saxutils.py`
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--------------
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The module :mod:`xml.sax.saxutils` contains a number of classes and functions
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that are commonly useful when creating SAX applications, either in direct use,
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or as base classes.
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.. function:: escape(data, entities={})
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Escape ``'&'``, ``'<'``, and ``'>'`` in a string of data.
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You can escape other strings of data by passing a dictionary as the optional
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*entities* parameter. The keys and values must all be strings; each key will be
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replaced with its corresponding value. The characters ``'&'``, ``'<'`` and
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``'>'`` are always escaped, even if *entities* is provided.
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.. note::
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This function should only be used to escape characters that
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can't be used directly in XML. Do not use this function as a general
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string translation function.
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.. function:: unescape(data, entities={})
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Unescape ``'&'``, ``'<'``, and ``'>'`` in a string of data.
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You can unescape other strings of data by passing a dictionary as the optional
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*entities* parameter. The keys and values must all be strings; each key will be
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replaced with its corresponding value. ``'&'``, ``'<'``, and ``'>'``
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are always unescaped, even if *entities* is provided.
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.. function:: quoteattr(data, entities={})
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Similar to :func:`escape`, but also prepares *data* to be used as an
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attribute value. The return value is a quoted version of *data* with any
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additional required replacements. :func:`quoteattr` will select a quote
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character based on the content of *data*, attempting to avoid encoding any
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quote characters in the string. If both single- and double-quote characters
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are already in *data*, the double-quote characters will be encoded and *data*
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will be wrapped in double-quotes. The resulting string can be used directly
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as an attribute value::
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>>> print("<element attr=%s>" % quoteattr("ab ' cd \" ef"))
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<element attr="ab ' cd " ef">
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This function is useful when generating attribute values for HTML or any SGML
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using the reference concrete syntax.
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.. class:: XMLGenerator(out=None, encoding='iso-8859-1', short_empty_elements=False)
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This class implements the :class:`~xml.sax.handler.ContentHandler` interface
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by writing SAX
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events back into an XML document. In other words, using an :class:`XMLGenerator`
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as the content handler will reproduce the original document being parsed. *out*
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should be a file-like object which will default to *sys.stdout*. *encoding* is
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the encoding of the output stream which defaults to ``'iso-8859-1'``.
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*short_empty_elements* controls the formatting of elements that contain no
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content: if ``False`` (the default) they are emitted as a pair of start/end
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tags, if set to ``True`` they are emitted as a single self-closed tag.
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.. versionadded:: 3.2
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The *short_empty_elements* parameter.
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.. class:: XMLFilterBase(base)
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This class is designed to sit between an
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:class:`~xml.sax.xmlreader.XMLReader` and the client
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application's event handlers. By default, it does nothing but pass requests up
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to the reader and events on to the handlers unmodified, but subclasses can
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override specific methods to modify the event stream or the configuration
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requests as they pass through.
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.. function:: prepare_input_source(source, base='')
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This function takes an input source and an optional base URL and returns a
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fully resolved :class:`~xml.sax.xmlreader.InputSource` object ready for
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reading. The input source can be given as a string, a file-like object, or
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an :class:`~xml.sax.xmlreader.InputSource` object; parsers will use this
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function to implement the polymorphic *source* argument to their
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:meth:`~xml.sax.xmlreader.XMLReader.parse` method.
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