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_exceptions.py4.7 KB · 132 lines
"""Different kinds of SAX Exceptions"""import sysif sys.platform[:4] == "java":    from java.lang import Exceptiondel sys # ===== 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."""