def _handle_hr(self):
        """Handle a wiki-style horizontal rule (``----``) in the string."""
        length = 4
        self._head += 3
        while self._read(1) == "-":
            length += 1
            self._head += 1
        self._emit(tokens.TagOpenOpen(wiki_markup="-" * length))
        self._emit_text("hr")
        self._emit(tokens.TagCloseSelfclose())
Handle a wiki-style horizontal rule (``----``) in the string.