import sgmllib, xml.sax.saxutils

class Parser(sgmllib.SGMLParser):
  def reset(self):
    sgmllib.SGMLParser.reset(self)
    self.text = []
  def unknown_starttag(self, tag, attrs):
    print "Tag opened:", tag
    for a, v in attrs:
      print "Arg: ", a, " -> ", v
      print "Argv escaped:", xml.sax.saxutils.quoteattr(v)
    strattrs = "".join([' %s=%s' % (key, xml.sax.saxutils.quoteattr(value)) for key, value in attrs])
    self.text.append("<%(tag)s%(strattrs)s>" % locals())

  def unknown_endtag(self, tag):
    print "Tag closed:", tag
    self.text.append("</%s>" % tag)
  def handle_data(self, text):
    print "Data:", text
    self.text.append(xml.sax.saxutils.escape(text))
  def get_text(self):
    return "".join(self.text)

import unittest
class TestSGML(unittest.TestCase):
  def test(self):
    in_str = """<a href='http://www.example.org/"<;'>example</a>"""
    out_str = """<a href='http://www.example.org/"&lt;;'>example</a>"""
    parser = Parser()
    print "Fed:", in_str
    parser.feed(in_str)
    result = parser.get_text()
    self.assertEqual(out_str, result)

if __name__ == "__main__":
  unittest.main()