| 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() |