#!/usr/bin/env python

#
# Example of how to parse an XML document and then write it out again.
# This snippet is public domain, use it as you wish.
#

import xml.etree.ElementTree
import sys

class XMLreader :
    class EchoTarget :
        def __init__(self) :
            self.level = 0
            self.last_was_data = False

        # Ugh, this is so gross -- but ElementTree doesn't
        # give us any other way to remove the namespace.
        # There's supposed to be something called fixtag but
        # there's no documentation on what args it takes.
        @staticmethod
        def removeNS(nstag) :
            spl = nstag.split("}")
            if len(spl) > 1 :
                return spl[1]
            return spl

        def start(self, tag, attribs):
            #print("start %s %s" % (self.removeNS(tag), attrib))
            sys.stdout.write("\n%s<%s" %
                             (''.rjust(self.level * 2), self.removeNS(tag)))
            for key in attribs.keys() :
                sys.stdout.write(' %s="%s"' % (key, attribs[key]))
            sys.stdout.write(">")
            self.level += 1
            self.last_was_data = False
        def end(self, tag):
            self.level -= 1
            #print("%s</%s>" % (''.rjust(self.level * 2), self.removeNS(tag)))
            #print '\nlast_was_data:', self.last_was_data
            if not self.last_was_data :
                sys.stdout.write('\n%s' % ''.rjust(self.level * 2))
            sys.stdout.write("</%s>" % self.removeNS(tag))
            self.last_was_data = False
        def data(self, data) :
            if not data.isspace() :
                #print("%s%s" % (''.rjust(self.level * 2), data))
                sys.stdout.write(data)
                self.last_was_data = True
            else :
                self.last_was_data = False
        def comment(self, text):
            sys.stdout.write("comment %s\n" % text)
            self.last_was_data = True
        def close(self):
            print("close")
            return "closed!"

    def parse(self, filename) :
        fp = open(filename)
        parser = xml.etree.ElementTree.XMLParser(target = self.EchoTarget())
        try :
            while True :
                line = fp.readline()
                if not line: break
                parser.feed(line)
        except IOError :
            print "IOError, closing"
            try :
                fp.close()
                parser.close()
            except :
                print "ignoring any other errors"
            return
        parser.close()
        fp.close()

# main
if __name__ == "__main__" :
    xmlreader = XMLreader()
    xmlreader.parse(sys.argv[1])