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import {  hex,  isAbsolute,  join,  normalize,  resolve,  toFileUrl,} from "./deps.ts";
export const encoder = new TextEncoder();export const decoder = new TextDecoder();
function baseUrlToFilename(url: URL): string {  const out = [];  const protocol = url.protocol.replace(":", "");  out.push(protocol);
  switch (protocol) {    case "http":    case "https": {      const host = url.hostname;      const hostPort = url.port;      out.push(hostPort ? `${host}_PORT${hostPort}` : host);      break;    }    case "file":    case "data":    case "blob":      break;    default:      throw new TypeError(        `Don't know how to create cache name for protocol: ${protocol}`,      );  }
  return join(...out);}
export function stringToURL(url: string): URL {  // deno-fmt-ignore  return url.startsWith("file://")      || url.startsWith("http://")      || url.startsWith("https://")    ? new URL(url)    : toFileUrl(resolve(url));}
export async function hash(value: string): Promise<string> {  return decoder.decode(    hex(      new Uint8Array(        await crypto.subtle.digest("SHA-256", encoder.encode(value)),      ),    ),  );}
export async function urlToFilename(url: URL): Promise<string> {  const cacheFilename = baseUrlToFilename(url);  const hashedFilename = await hash(url.pathname + url.search);  return join(cacheFilename, hashedFilename);}
export async function isFile(filePath: string): Promise<boolean> {  try {    const stats = await Deno.lstat(filePath);    return stats.isFile;  } catch (err) {    if (err instanceof Deno.errors.NotFound) {      return false;    }    throw err;  }}
// The rest of is based on code from denoland/deno_cache by the Deno authors// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
export function homeDir(): string | undefined {  switch (Deno.build.os) {    case "windows":      Deno.permissions.request({ name: "env", variable: "USERPROFILE" });      return Deno.env.get("USERPROFILE");    case "linux":    case "darwin":      Deno.permissions.request({ name: "env", variable: "HOME" });      return Deno.env.get("HOME");    default:      throw Error("unreachable");  }}
export function cacheDir(): string | undefined {  if (Deno.build.os === "darwin") {    const home = homeDir();    if (home) {      return join(home, "Library/Caches");    }  } else if (Deno.build.os === "linux") {    Deno.permissions.request({ name: "env", variable: "XDG_CACHE_HOME" });    const cacheHome = Deno.env.get("XDG_CACHE_HOME");    if (cacheHome) {      return cacheHome;    } else {      const home = homeDir();      if (home) {        return join(home, ".cache");      }    }  } else {    Deno.permissions.request({ name: "env", variable: "LOCALAPPDATA" });    return Deno.env.get("LOCALAPPDATA");  }}
export function denoCacheDir() {  Deno.permissions.request({ name: "env", variable: "DENO_DIR" });  const dd = Deno.env.get("DENO_DIR");  let root;  if (dd) {    root = normalize(isAbsolute(dd) ? dd : join(Deno.cwd(), dd));  } else {    const cd = cacheDir();    if (cd) {      root = join(cd, "deno");    } else {      const hd = homeDir();      if (hd) {        root = join(hd, ".deno");      }    }  }
  return root;}