import sys
from xml.sax import make_parser, handler
# --- Templates
top = \
"""
  %s
%s
"""
bottom = \
"""
Converted to HTML by sax_rss2html.py.
"""
# --- The ContentHandler
class RSSHandler(handler.ContentHandler):
    def __init__(self, out = sys.stdout):
        handler.ContentHandler.__init__(self)
        self._out = out
        self._text = ""
        self._parent = None
        self._list_started = 0
        self._title = None
        self._link = None
        self._descr = ""
    # ContentHandler methods
    def startElement(self, name, attrs):
        if name == "channel" or name == "image" or name == "item":
            self._parent = name
        self._text = ""
    def endElement(self, name):
        if self._parent == "channel":
            if name == "title":
                self._out.write(top % (self._text, self._text))
            elif name == "description":
                self._out.write("%s
\n" % self._text)
        elif self._parent == "item":
            if name == "title":
                self._title = self._text
            elif name == "link":
                self._link = self._text
            elif name == "description":
                self._descr = self._text
            elif name == "item":
                if not self._list_started:
                    self._out.write("\n")
                    self._list_started = 1
                self._out.write('  - %s %s\n' %
                                (self._link, self._title, self._descr))
                self._title = None
                self._link = None
                self._descr = ""
        if name == "rss":
            self._out.write(bottom)
    def characters(self, content):
        self._text = self._text + content
# --- Main program
parser = make_parser()
parser.setContentHandler(RSSHandler())
parser.parse(sys.argv[1])