123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293
import { serve, ServeInit } from "https://deno.land/std@0.163.0/http/server.ts";import { Context } from "./context.ts";import decode from "./decode.ts";import { Handler, ServerError } from "./types.ts";
const notFound = {  status: 404,  message: "The requested resource doesn't exist.",};
interface Match {  handler: Handler;  params?: Record<string, string>;}
export interface WebApp {  get(path: string, handler: Handler): WebApp;  post(path: string, handler: Handler): WebApp;  put(path: string, handler: Handler): WebApp;  patch(path: string, handler: Handler): WebApp;  delete(path: string, handler: Handler): WebApp;  options(path: string, handler: Handler): WebApp;  head(path: string, handler: Handler): WebApp;}
export class WebApp {  #routes: Map<string, Handler>;  #patterns: URLPattern[];  #cache: Record<string, Match | null>;
  constructor() {    this.#routes = new Map();    this.#patterns = [];    this.#cache = {};
    // Define methods    // deno-fmt-ignore-line    const methods = ['get', 'post', 'put', 'patch', 'delete', 'options', 'head'] as const;    for (const method of methods) {      this[method] = (path, handler) =>        this.#add(path, method.toUpperCase(), handler);    }  }
  #add(pathname: string, method: string, handler: Handler) {    const id = method + pathname;    this.#routes.set(id, handler);
    const pattern = new URLPattern({ pathname });    const has = this.#patterns.find((p) => p.pathname === pathname);    if (!has) this.#patterns.push(pattern);
    return this;  }
  #match(path: string, method: string) {    const cid = method + path;    const hit = this.#cache[cid];    if (hit) return hit;
    const pattern = this.#patterns.find((p) => p.test(path));    if (!pattern) return this.#cache[cid] = null;    const { pathname } = pattern;
    const id = method + pathname;    const handler = this.#routes.get(id);    if (!handler) return this.#cache[cid] = null;
    if (pathname.includes(":")) {      const exec = pattern.exec(path);      const params = exec?.pathname.groups;      return this.#cache[cid] = { handler, params };    } else return this.#cache[cid] = { handler };  }
  handle = async (request: Request) => {    try {      const match = this.#match(request.url, request.method);      const ctx: Context = new Context({ request });      ctx.assert(match, notFound);      ctx.params = match.params ?? {};      const res = await match.handler(ctx);      return decode(res, ctx.status);    } catch (error) {      const err = ServerError.from(error);      const res = err.serialize();      return decode(res, err.status);    }  };
  serve = (opts?: ServeInit) => serve(this.handle, opts);}