Paul Prescod <paul@prescod.net>:
SAX interfaces for Python.
diff --git a/Lib/xml/sax/xmlreader.py b/Lib/xml/sax/xmlreader.py
new file mode 100644
index 0000000..b66ef1c
--- /dev/null
+++ b/Lib/xml/sax/xmlreader.py
@@ -0,0 +1,225 @@
+import handler
+
+"""An XML Reader is the SAX 2 name for an XML parser. XML Parsers
+should be based on this code. """
+# ===== XMLREADER =====
+
+class XMLReader:
+ def __init__(self):
+ self._cont_handler = handler.ContentHandler()
+ #self._dtd_handler = handler.DTDHandler()
+ #self._ent_handler = handler.EntityResolver()
+ self._err_handler = handler.ErrorHandler()
+
+ def parse(self, source):
+ "Parse an XML document from a system identifier or an InputSource."
+ raise NotImplementedError("This method must be implemented!")
+
+ def getContentHandler(self):
+ "Returns the current ContentHandler."
+ return self._cont_handler
+
+ def setContentHandler(self, handler):
+ "Registers a new object to receive document content events."
+ self._cont_handler = handler
+
+ def getDTDHandler(self):
+ "Returns the current DTD handler."
+ return self._dtd_handler
+
+ def setDTDHandler(self, handler):
+ "Register an object to receive basic DTD-related events."
+ self._dtd_handler = handler
+
+ def getEntityResolver(self):
+ "Returns the current EntityResolver."
+ return self._ent_handler
+
+ def setEntityResolver(self, resolver):
+ "Register an object to resolve external entities."
+ self._ent_handler = resolver
+
+ def getErrorHandler(self):
+ "Returns the current ErrorHandler."
+ return self._err_handler
+
+ def setErrorHandler(self, handler):
+ "Register an object to receive error-message events."
+ self._err_handler = handler
+
+ def setLocale(self, locale):
+ """Allow an application to set the locale for errors and warnings.
+
+ SAX parsers are not required to provide localisation for errors
+ and warnings; if they cannot support the requested locale,
+ however, they must throw a SAX exception. Applications may
+ request a locale change in the middle of a parse."""
+ raise SAXNotSupportedException("Locale support not implemented")
+
+ def getFeature(self, name):
+ "Looks up and returns the state of a SAX2 feature."
+ raise SAXNotRecognizedException("Feature '%s' not recognized" % name)
+
+ def setFeature(self, name, state):
+ "Sets the state of a SAX2 feature."
+ raise SAXNotRecognizedException("Feature '%s' not recognized" % name)
+
+ def getProperty(self, name):
+ "Looks up and returns the value of a SAX2 property."
+ raise SAXNotRecognizedException("Property '%s' not recognized" % name)
+
+ def setProperty(self, name, value):
+ "Sets the value of a SAX2 property."
+ raise SAXNotRecognizedException("Property '%s' not recognized" % name)
+
+
+class IncrementalParser(XMLReader):
+ """This interface adds three extra methods to the XMLReader
+ interface that allow XML parsers to support incremental
+ parsing. Support for this interface is optional, since not all
+ underlying XML parsers support this functionality.
+
+ When the parser is instantiated it is ready to begin accepting
+ data from the feed method immediately. After parsing has been
+ finished with a call to close the reset method must be called to
+ make the parser ready to accept new data, either from feed or
+ using the parse method.
+
+ Note that these methods must _not_ be called during parsing, that
+ is, after parse has been called and before it returns.
+
+ By default, the class also implements the parse method of the XMLReader
+ interface using the feed, close and reset methods of the
+ IncrementalParser interface as a convenience to SAX 2.0 driver
+ writers."""
+ def __init__(self, bufsize=2**16 ):
+ self._bufsize=bufsize
+ XMLReader.__init__( self )
+
+ def parse(self, source):
+ self.prepareParser(source)
+ #FIXME: do some type checking: could be already stream, URL or
+ # filename
+ inf=open( source )
+ buffer = inf.read(self._bufsize)
+ while buffer != "":
+ self.feed(buffer)
+ buffer = inf.read(self._bufsize)
+ self.close()
+ self.reset()
+
+ def feed(self, data):
+ """This method gives the raw XML data in the data parameter to
+ the parser and makes it parse the data, emitting the
+ corresponding events. It is allowed for XML constructs to be
+ split across several calls to feed.
+
+ feed may raise SAXException."""
+ raise NotImplementedError("This method must be implemented!")
+ def prepareParser(self, source):
+ """This method is called by the parse implementation to allow
+ the SAX 2.0 driver to prepare itself for parsing."""
+ raise NotImplementedError("prepareParser must be overridden!")
+
+ def close(self):
+ """This method is called when the entire XML document has been
+ passed to the parser through the feed method, to notify the
+ parser that there are no more data. This allows the parser to
+ do the final checks on the document and empty the internal
+ data buffer.
+
+ The parser will not be ready to parse another document until
+ the reset method has been called.
+
+ close may raise SAXException."""
+ raise NotImplementedError("This method must be implemented!")
+
+ def reset(self):
+ """This method is called after close has been called to reset
+ the parser so that it is ready to parse new documents. The
+ results of calling parse or feed after close without calling
+ reset are undefined."""
+ raise NotImplementedError("This method must be implemented!")
+
+# ===== LOCATOR =====
+class Locator:
+ """Interface for associating a SAX event with a document
+ location. A locator object will return valid results only during
+ calls to DocumentHandler methods; at any other time, the
+ results are unpredictable."""
+
+ def getColumnNumber(self):
+ "Return the column number where the current event ends."
+ return -1
+
+ def getLineNumber(self):
+ "Return the line number where the current event ends."
+ return -1
+
+ def getPublicId(self):
+ "Return the public identifier for the current event."
+ return None
+
+ def getSystemId(self):
+ "Return the system identifier for the current event."
+ return None
+
+# --- AttributesImpl
+class AttributesImpl:
+ def __init__(self, attrs, rawnames):
+ self._attrs = attrs
+ self._rawnames = rawnames
+
+ def getLength(self):
+ return len(self._attrs)
+
+ def getType(self, name):
+ return "CDATA"
+
+ def getValue(self, name):
+ return self._attrs[name]
+
+ def getValueByQName(self, name):
+ return self._attrs[self._rawnames[name]]
+
+ def getNameByQName(self, name):
+ return self._rawnames[name]
+
+ def getNames(self):
+ return self._attrs.keys()
+
+ def getQNames(self):
+ return self._rawnames.keys()
+
+ def __len__(self):
+ return len(self._attrs)
+
+ def __getitem__(self, name):
+ return self._attrs[name]
+
+ def keys(self):
+ return self._attrs.keys()
+
+ def has_key(self, name):
+ return self._attrs.has_key(name)
+
+ def get(self, name, alternative=None):
+ return self._attrs.get(name, alternative)
+
+ def copy(self):
+ return self.__class__(self._attrs, self._rawnames)
+
+ def items(self):
+ return self._attrs.items()
+
+ def values(self):
+ return self._attrs.values()
+
+def _test():
+ XMLReader()
+ IncrementalParser()
+ Locator()
+ AttributesImpl()
+
+if __name__=="__main__":
+ _test()