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Editing: _exceptions.py
"""Different kinds of SAX Exceptions""" # ===== SAXEXCEPTION ===== class SAXException(Exception): """Encapsulate an XML error or warning. This class can contain basic error or warning information from either the XML parser or the application: you can subclass it to provide additional functionality, or to add localization. Note that although you will receive a SAXException as the argument to the handlers in the ErrorHandler interface, you are not actually required to raise the exception; instead, you can simply read the information in it.""" def __init__(self, msg, exception=None): """Creates an exception. The message is required, but the exception is optional.""" self._msg = msg self._exception = exception Exception.__init__(self, msg) def getMessage(self): "Return a message for this exception." return self._msg def getException(self): "Return the embedded exception, or None if there was none." return self._exception def __str__(self): "Create a string representation of the exception." return self._msg def __getitem__(self, ix): """Avoids weird error messages if someone does exception[ix] by mistake, since Exception has __getitem__ defined.""" raise AttributeError("__getitem__") # ===== SAXPARSEEXCEPTION ===== class SAXParseException(SAXException): """Encapsulate an XML parse error or warning. This exception will include information for locating the error in the original XML document. Note that although the application will receive a SAXParseException as the argument to the handlers in the ErrorHandler interface, the application is not actually required to raise the exception; instead, it can simply read the information in it and take a different action. Since this exception is a subclass of SAXException, it inherits the ability to wrap another exception.""" def __init__(self, msg, exception, locator): "Creates the exception. The exception parameter is allowed to be None." SAXException.__init__(self, msg, exception) self._locator = locator # We need to cache this stuff at construction time. # If this exception is raised, the objects through which we must # traverse to get this information may be deleted by the time # it gets caught. self._systemId = self._locator.getSystemId() self._colnum = self._locator.getColumnNumber() self._linenum = self._locator.getLineNumber() def getColumnNumber(self): """The column number of the end of the text where the exception occurred.""" return self._colnum def getLineNumber(self): "The line number of the end of the text where the exception occurred." return self._linenum def getPublicId(self): "Get the public identifier of the entity where the exception occurred." return self._locator.getPublicId() def getSystemId(self): "Get the system identifier of the entity where the exception occurred." return self._systemId def __str__(self): "Create a string representation of the exception." sysid = self.getSystemId() if sysid is None: sysid = "<unknown>" linenum = self.getLineNumber() if linenum is None: linenum = "?" colnum = self.getColumnNumber() if colnum is None: colnum = "?" return "%s:%s:%s: %s" % (sysid, linenum, colnum, self._msg) # ===== SAXNOTRECOGNIZEDEXCEPTION ===== class SAXNotRecognizedException(SAXException): """Exception class for an unrecognized identifier. An XMLReader will raise this exception when it is confronted with an unrecognized feature or property. SAX applications and extensions may use this class for similar purposes.""" # ===== SAXNOTSUPPORTEDEXCEPTION ===== class SAXNotSupportedException(SAXException): """Exception class for an unsupported operation. An XMLReader will raise this exception when a service it cannot perform is requested (specifically setting a state or value). SAX applications and extensions may use this class for similar purposes.""" # ===== SAXNOTSUPPORTEDEXCEPTION ===== class SAXReaderNotAvailable(SAXNotSupportedException): """Exception class for a missing driver. An XMLReader module (driver) should raise this exception when it is first imported, e.g. when a support module cannot be imported. It also may be raised during parsing, e.g. if executing an external program is not permitted."""
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