def map_root_static(self):
        '''
        handle root-static files (no hyphen mapping)

        a root-static file is one whose incoming URL expects it to be at the root,
        typically robots.txt & favicon.ico
        '''

        if len(self.args) == 1 and self.arg0 in self.router.root_static:
            self.controller = self.request.controller = 'static'
            root_static_file = pjoin(self.request.env.applications_parent,
                                     'applications', self.application,
                                     self.controller, self.arg0)
            log_rewrite("route: root static=%s" % root_static_file)
            return root_static_file, None
        return None, None
dataset/ETHPy150Open uwdata/termite-visualizations/web2py/gluon/rewrite.py/MapUrlIn.map_root_static/original