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Posted By

n3x on 07/18/07


Tagged

dtd xml validate PyXML


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XML DTD validation for python

Published in: Python 

jotham from #pygame made this module that provides 'optional' DTD validation, i.e. if the PyXML module is available, your file is checked, otherwise it does nothing.

Plain TextExpand 
  1. """
  2. Optional XML Validator
  3.  
  4. This module attempts to provide XML DTD validation support.  This module should not cause
  5. a critical error if PyXML is not installed on the users system.
  6. """
  7.  
  8. try:
  9.     from xml.parsers.xmlproc import xmlval
  10.     from xml.parsers.xmlproc import xmlproc
  11. except ImportError, e:
  12.     print 'Not validating, Import Error:', e
  13.     ValidationError = None
  14. else:
  15.     class ValidationError (Exception):
  16.         def __init__ (self, type, message, location):
  17.             self.type = type
  18.             self.message = message
  19.             self.location = location
  20.         def __repr__ (self):
  21.             return "L%s:%s %s: %s" % (self.location[0], self.location[1], self.type, self.message)
  22.  
  23.     class ErrorHandler (xmlproc.ErrorHandler):
  24.         def location (self):
  25.             return self.locator.get_line(), self.locator.get_column()
  26.         def warning (self, msg):
  27.             raise ValidationError('Warning', msg, self.location())
  28.         def error (self, msg):
  29.             raise ValidationError('Error', msg, self.location())
  30.         def fatal (self, msg):
  31.             raise ValidationError('Fatal', msg, self.location())
  32.  
  33. def validate_dtd (file):
  34.     if not ValidationError: return # return if we (are assumed to) have not loaded the xml modules
  35.     parser = xmlval.XMLValidator()
  36.     parser.set_error_handler(ErrorHandler(parser))
  37.     parser.parse_resource(file)
  38.  
  39. if __name__ == '__main__':
  40.     try:
  41.         validate_dtd('./example1.xml')
  42.     except ValidationError, e:
  43.         print repr(e)

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