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import util from "../../shared/util.ts";import type { URLPatternCompat, URLPatternInput, URLPatternResult } from "./url_pattern.ts";import { createStaticURLPatternResult } from "./url_pattern.ts";
export type RouteModule = {  url: URL;  params: Record<string, string>;  filename: string;  exports: Record<string, unknown>;  withData?: boolean;  data?: unknown;  dataCacheTtl?: number;};
export type RouteMeta = {  filename: string;  pattern: URLPatternInput;  nesting?: boolean;};
export type Route = readonly [  pattern: URLPatternCompat,  meta: RouteMeta,];
export type Router = {  appDir?: string;  prefix: string;  routes: Route[];  _404?: Route;  _app?: Route;};
export type RouteRegExp = {  prefix: string;  test(filename: string): boolean;  exec(filename: string): URLPatternInput | null;};
export type RouteMatch = [ret: URLPatternResult, route: RouteMeta];
/** match routes against the given url */export function matchRoutes(url: URL, router: Router): RouteMatch[] {  const { routes, _app, _404 } = router;  let { pathname } = url;  if (pathname !== "/") {    pathname = util.trimSuffix(pathname, "/");  }  const matches: [ret: URLPatternResult, route: RouteMeta][] = [];  if (routes.length > 0) {    // find the direct match    for (const [pattern, meta] of routes) {      const { pathname: pp } = meta.pattern;      if (pp !== "/_app" && pp !== "/_404") {        const ret = pattern.exec({ host: url.host, pathname });        if (ret) {          matches.push([ret, meta]);          break;        }      }    }    if (matches.length === 0) {      // find index route      for (const [p, m] of routes) {        if (m.pattern.pathname.endsWith("/index")) {          const ret = p.exec({ host: url.host, pathname: pathname + "/index" });          if (ret) {            matches.push([ret, m]);            break;          }        }      }    }    if (matches.length > 0) {      const directMatch = matches[matches.length - 1][1];      const parts = util.splitPath(pathname);      const nestRoutes = routes.filter(([_, m]) =>        m.nesting && m.pattern.pathname !== "/_app" && directMatch.pattern.pathname.startsWith(m.pattern.pathname + "/")      );      // lookup nesting parent      for (let i = parts.length - 1; i > 0; i--) {        const pathname = "/" + parts.slice(0, i).join("/");        for (const [pattern, meta] of nestRoutes) {          const ret = pattern.exec({ host: url.host, pathname });          if (ret) {            matches.unshift([ret, meta]);            break;          }        }      }
      if (directMatch.nesting) {        // find index route        for (const [p, m] of routes) {          if (m.pattern.pathname === directMatch.pattern.pathname + "/index") {            const ret = p.exec({ host: url.host, pathname: pathname + "/index" });            if (ret) {              matches.push([ret, m]);              break;            }          }        }      }    }    if (_404 && (matches.length === 0 || matches.filter(([_, meta]) => !meta.nesting).length === 0)) {      matches.push([createStaticURLPatternResult(url.host, "/_404"), _404[1]]);    }    if (_app && matches.length > 0) {      matches.unshift([createStaticURLPatternResult(url.host, "/_app"), _app[1]]);    }  }  return matches;}