from string import Template

        # Replace ~...~ in token format by range of pages

        result = re.sub(r'~(\d+)~', self._range, format)

        # Interpolate '%' variables

        result = Template(result).safe_substitute({

            'first_page': self.first_page,

            'last_page': self.last_page,

            'page': self.page,

            'page_count': self.page_count,

            'items_per_page': self.items_per_page,

            'first_item': self.first_item,

            'last_item': self.last_item,

            'item_count': self.item_count,

            'link_first': self.page > self.first_page and

                    self._pagerlink(self.first_page, symbol_first) or '',

            'link_last': self.page < self.last_page and

                    self._pagerlink(self.last_page, symbol_last) or '',

            'link_previous': HTML.li(self.previous_page and

                    self._pagerlink(self.previous_page, symbol_previous)

                    or HTML.a(symbol_previous)),

            'link_next': HTML.li(self.next_page and

                    self._pagerlink(self.next_page, symbol_next)

        })

        return literal(result)

class RepoPage(Page):

    def __init__(self, collection, page=1, items_per_page=20,

                 item_count=None, **kwargs):

        """Create a "RepoPage" instance. special pager for paging

        repository

        """

        # TODO: call baseclass __init__

        self._url_generator = kwargs.pop('url', url.current)

        # Safe the kwargs class-wide so they can be used in the pager() method

        self.kwargs = kwargs

        # Save a reference to the collection

        self.original_collection = collection

        self.collection = collection