Compile the top file and return the lowstate for the thorium runtime
        to iterate over

def get_chunks(self, exclude=None, whitelist=None):
        '''
        Compile the top file and return the lowstate for the thorium runtime
        to iterate over
        '''
        ret = {}
        err = []
        try:
            top = self.get_top()
        except SaltRenderError as err:
            return ret
        except Exception:
            trb = traceback.format_exc()
            err.append(trb)
            return err
        err += self.verify_tops(top)
        matches = self.top_matches(top)
        if not matches:
            msg = 'No Top file found!'
            raise SaltRenderError(msg)
        matches = self.matches_whitelist(matches, whitelist)
        high, errors = self.render_highstate(matches)
        if exclude:
            if isinstance(exclude, six.string_types):
                exclude = exclude.split(',')
            if '__exclude__' in high:
                high['__exclude__'].extend(exclude)
            else:
                high['__exclude__'] = exclude
            err += errors
        high, ext_errors = self.state.reconcile_extend(high)
        err += ext_errors
        err += self.state.verify_high(high)
        if err:
            raise SaltRenderError(err)
        return self.state.compile_high_data(high)