class LocationDataReader(object):
   def __init__(self, uri, parent):
      self.uri = uri
      self.parent = parent

      self.title = None
      self.uripattern = None
      self.tabnames = {}
      self.places = {}

      self.parse()

   def parse(self):
      self.openuri()
      try: self.head()
      except Exception, e:
         msg = 'This file is invalid and raised the error: %r'
         appuifw.note(msg % e, 'error')
         self.parent.restart()

      while 1:
         line = self.getline()
         if line is None: break
         try:
            # p and q need naming better
            code, p, q = line.split('\t', 2)
            self.places[code][p] = unicode(q)
            appuifw.app.body.add(u".")
         except:
            msg = u"\nThe following line is ill formed: %s" % line
            appuifw.app.body.add(msg)

   def openuri(self, uri=None):
      if uri is None:
         uri = self.uri

      try: self.u = urllib.urlopen(uri)
      except Exception, e:
         msg = 'That URI produced an error: %r. Restarting.'
         appuifw.note(msg % e, 'error')
         return

   def head(self):
      line = self.getline()
      while line.startswith('#'):
         line = self.getline()
      self.title = unicode(line)
      self.urlpattern = self.getline()

      for item in self.getline().split('\t'): 
         longname, code = item.split('::', 1)
         places[code] = dict()
         tab[code] = unicode(longname)

   def getline(self): 
      rawline = self.u.next()
      if not line: return None
      return line.rstrip('\r\n')