Demo/xml/roundtrip.py

   1 """
   2 A simple demo that reads in an XML document and spits out an equivalent,
   3 but not necessarily identical, document.
   4 """
   5
   6 import sys
   7
   8 from xml.sax import saxutils, handler, make_parser
   9
  10 # --- The ContentHandler
  11
  12 class ContentGenerator(handler.ContentHandler):
  13
  14     def __init__(self, out=sys.stdout):
  15         handler.ContentHandler.__init__(self)
  16         self._out = out
  17
  18     # ContentHandler methods
  19
  20     def startDocument(self):
  21         self._out.write('<?xml version="1.0" encoding="iso-8859-1"?>\n')
  22
  23     def startElement(self, name, attrs):
  24         self._out.write('<' + name)
  25         for (name, value) in attrs.items():
  26             self._out.write(' %s="%s"' % (name, saxutils.escape(value)))
  27         self._out.write('>')
  28
  29     def endElement(self, name):
  30         self._out.write('</%s>' % name)
  31
  32     def characters(self, content):
  33         self._out.write(saxutils.escape(content))
  34
  35     def ignorableWhitespace(self, content):
  36         self._out.write(content)
  37
  38     def processingInstruction(self, target, data):
  39         self._out.write('<?%s %s?>' % (target, data))
  40
  41 # --- The main program
  42
  43 if __name__ == '__main__':
  44     parser = make_parser()
  45     parser.setContentHandler(ContentGenerator())
  46     parser.parse(sys.argv[1])