Work4 - Programming - Q5 - SAX

import xml.sax
import io

# A sample of HTML to test
html = u'<ul class="class"><li>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</li><li class="class">Aliquam tincidunt mauris eu risus.</li><li>Vestibulum auctor dapibus neque.</li></ul>'

class TagCounter(xml.sax.ContentHandler):
  """A simple SAX Handler counting XML tags"""
  
  def __init__(self, listener):
    """
      The listener parameter should be a function that has 2 parameters: 
        - name: the name of the most occurent tag
        - count: the number of tag found
      It will be trigger to notify when the parsing is done
    """
    self.listener = listener
    self.tags = dict()

def startElement(self, name, attrs):
    """Counting elements according to there name"""
    try:
      self.tags[name] += 1
    except KeyError:
      self.tags[name] = 1

def endDocument(self):
    """Looking for the most common and notifying it's done"""
    max = 0
    name = ''
    for tag, cpt in self.tags.iteritems():
      if tag > max:
        max = cpt
        name = tag
    self.listener(name, max)

# Defining the listning function
def tagCounterListener(name, count):
  print "Most common tag: " + str(name) + " with " + str(count) + " instances"

# Starting to parse
parser = xml.sax.make_parser()
parser.setContentHandler(TagCounter(tagCounterListener))
parser.parse(io.StringIO(html))

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