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annotate Doc/lib/xmlsaxutils.tex @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
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1 \section{\module{xml.sax.saxutils} ---
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2 SAX Utilities}
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3
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4 \declaremodule{standard}{xml.sax.saxutils}
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5 \modulesynopsis{Convenience functions and classes for use with SAX.}
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6 \sectionauthor{Martin v. L\"owis}{loewis@informatik.hu-berlin.de}
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7 \moduleauthor{Lars Marius Garshol}{larsga@garshol.priv.no}
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8
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9 \versionadded{2.0}
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10
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12 The module \module{xml.sax.saxutils} contains a number of classes and
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13 functions that are commonly useful when creating SAX applications,
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14 either in direct use, or as base classes.
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15
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16 \begin{funcdesc}{escape}{data\optional{, entities}}
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17 Escape \character{\&}, \character{<}, and \character{>} in a string
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18 of data.
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19
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20 You can escape other strings of data by passing a dictionary as the
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21 optional \var{entities} parameter. The keys and values must all be
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22 strings; each key will be replaced with its corresponding value.
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23 \end{funcdesc}
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24
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25 \begin{funcdesc}{quoteattr}{data\optional{, entities}}
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26 Similar to \function{escape()}, but also prepares \var{data} to be
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27 used as an attribute value. The return value is a quoted version of
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28 \var{data} with any additional required replacements.
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29 \function{quoteattr()} will select a quote character based on the
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30 content of \var{data}, attempting to avoid encoding any quote
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31 characters in the string. If both single- and double-quote
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32 characters are already in \var{data}, the double-quote characters
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33 will be encoded and \var{data} will be wrapped in doule-quotes. The
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34 resulting string can be used directly as an attribute value:
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35
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36 \begin{verbatim}
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37 >>> print "<element attr=%s>" % quoteattr("ab ' cd \" ef")
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38 <element attr="ab ' cd &quot; ef">
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39 \end{verbatim}
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40
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41 This function is useful when generating attribute values for HTML or
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42 any SGML using the reference concrete syntax.
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43 \versionadded{2.2}
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44 \end{funcdesc}
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45
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46 \begin{classdesc}{XMLGenerator}{\optional{out\optional{, encoding}}}
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47 This class implements the \class{ContentHandler} interface by
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48 writing SAX events back into an XML document. In other words, using
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49 an \class{XMLGenerator} as the content handler will reproduce the
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50 original document being parsed. \var{out} should be a file-like
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51 object which will default to \var{sys.stdout}. \var{encoding} is the
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52 encoding of the output stream which defaults to \code{'iso-8859-1'}.
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53 \end{classdesc}
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54
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55 \begin{classdesc}{XMLFilterBase}{base}
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56 This class is designed to sit between an \class{XMLReader} and the
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57 client application's event handlers. By default, it does nothing
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58 but pass requests up to the reader and events on to the handlers
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59 unmodified, but subclasses can override specific methods to modify
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60 the event stream or the configuration requests as they pass through.
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61 \end{classdesc}
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62
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63 \begin{funcdesc}{prepare_input_source}{source\optional{, base}}
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64 This function takes an input source and an optional base URL and
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65 returns a fully resolved \class{InputSource} object ready for
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66 reading. The input source can be given as a string, a file-like
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67 object, or an \class{InputSource} object; parsers will use this
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68 function to implement the polymorphic \var{source} argument to their
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69 \method{parse()} method.
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70 \end{funcdesc}