How to use the ansi2html.converter.CursorMoveUp function in ansi2html

# n_open is a count of the number of open tags
        # last_end is the index of the last end of a code we've seen
        n_open, last_end = 0, 0
        for match in self.ansi_codes_prog.finditer(ansi):
            yield ansi[last_end:match.start()]
            last_end = match.end()

            params, command = match.groups()

            if command not in 'mMA':
                continue

            # Special cursor-moving code.  The only supported one.
            if command == 'A':
                yield CursorMoveUp
                continue

            try:
                params = list(map(int, params.split(';')))
            except ValueError:
                params = [0]

            # Special control codes.  Mutate into an explicit-color css class.
            if params[0] in [38, 48]:
                params = ["%i-%i" % (params[0], params[2])] + params[3:]

            if 0 in params:
                # If the control code 0 is present, close all tags we've
                # opened so far.  i.e. reset all attributes
                yield '' * n_open
                n_open = 0

def _collapse_cursor(self, parts):
        """ Act on any CursorMoveUp commands by deleting preceding tokens """

        final_parts = []
        for part in parts:

            # Throw out empty string tokens ("")
            if not part:
                continue

            # Go back, deleting every token in the last 'line'
            if part == CursorMoveUp:
                final_parts.pop()
                while '\n' not in final_parts[-1]:
                    final_parts.pop()

                continue

            # Otherwise, just pass this token forward
            final_parts.append(part)

        return final_parts