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131 lines
4.7 KiB
Python
131 lines
4.7 KiB
Python
"""Different kinds of SAX Exceptions"""
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import sys
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if sys.platform[:4] == "java":
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from java.lang import Exception
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del sys
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# ===== SAXEXCEPTION =====
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class SAXException(Exception):
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"""Encapsulate an XML error or warning. This class can contain
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basic error or warning information from either the XML parser or
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the application: you can subclass it to provide additional
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functionality, or to add localization. Note that although you will
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receive a SAXException as the argument to the handlers in the
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ErrorHandler interface, you are not actually required to raise
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the exception; instead, you can simply read the information in
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it."""
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def __init__(self, msg, exception=None):
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"""Creates an exception. The message is required, but the exception
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is optional."""
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self._msg = msg
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self._exception = exception
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Exception.__init__(self, msg)
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def getMessage(self):
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"Return a message for this exception."
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return self._msg
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def getException(self):
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"Return the embedded exception, or None if there was none."
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return self._exception
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def __str__(self):
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"Create a string representation of the exception."
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return self._msg
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def __getitem__(self, ix):
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"""Avoids weird error messages if someone does exception[ix] by
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mistake, since Exception has __getitem__ defined."""
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raise AttributeError("__getitem__")
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# ===== SAXPARSEEXCEPTION =====
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class SAXParseException(SAXException):
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"""Encapsulate an XML parse error or warning.
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This exception will include information for locating the error in
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the original XML document. Note that although the application will
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receive a SAXParseException as the argument to the handlers in the
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ErrorHandler interface, the application is not actually required
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to raise the exception; instead, it can simply read the
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information in it and take a different action.
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Since this exception is a subclass of SAXException, it inherits
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the ability to wrap another exception."""
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def __init__(self, msg, exception, locator):
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"Creates the exception. The exception parameter is allowed to be None."
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SAXException.__init__(self, msg, exception)
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self._locator = locator
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# We need to cache this stuff at construction time.
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# If this exception is raised, the objects through which we must
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# traverse to get this information may be deleted by the time
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# it gets caught.
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self._systemId = self._locator.getSystemId()
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self._colnum = self._locator.getColumnNumber()
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self._linenum = self._locator.getLineNumber()
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def getColumnNumber(self):
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"""The column number of the end of the text where the exception
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occurred."""
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return self._colnum
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def getLineNumber(self):
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"The line number of the end of the text where the exception occurred."
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return self._linenum
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def getPublicId(self):
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"Get the public identifier of the entity where the exception occurred."
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return self._locator.getPublicId()
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def getSystemId(self):
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"Get the system identifier of the entity where the exception occurred."
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return self._systemId
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def __str__(self):
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"Create a string representation of the exception."
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sysid = self.getSystemId()
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if sysid is None:
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sysid = "<unknown>"
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linenum = self.getLineNumber()
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if linenum is None:
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linenum = "?"
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colnum = self.getColumnNumber()
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if colnum is None:
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colnum = "?"
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return "%s:%s:%s: %s" % (sysid, linenum, colnum, self._msg)
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# ===== SAXNOTRECOGNIZEDEXCEPTION =====
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class SAXNotRecognizedException(SAXException):
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"""Exception class for an unrecognized identifier.
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An XMLReader will raise this exception when it is confronted with an
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unrecognized feature or property. SAX applications and extensions may
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use this class for similar purposes."""
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# ===== SAXNOTSUPPORTEDEXCEPTION =====
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class SAXNotSupportedException(SAXException):
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"""Exception class for an unsupported operation.
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An XMLReader will raise this exception when a service it cannot
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perform is requested (specifically setting a state or value). SAX
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applications and extensions may use this class for similar
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purposes."""
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# ===== SAXNOTSUPPORTEDEXCEPTION =====
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class SAXReaderNotAvailable(SAXNotSupportedException):
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"""Exception class for a missing driver.
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An XMLReader module (driver) should raise this exception when it
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is first imported, e.g. when a support module cannot be imported.
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It also may be raised during parsing, e.g. if executing an external
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program is not permitted."""
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