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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// Documentation and interface for walk were adapted from Go// https://golang.org/pkg/path/filepath/#Walk// Copyright 2009 The Go Authors. All rights reserved. BSD license.import { assert } from "../_util/assert.ts";import { join, normalize } from "../path/mod.ts";import {  createWalkEntry,  createWalkEntrySync,  toPathString,  WalkEntry,} from "./_util.ts";
function include(  path: string,  exts?: string[],  match?: RegExp[],  skip?: RegExp[],): boolean {  if (exts && !exts.some((ext): boolean => path.endsWith(ext))) {    return false;  }  if (match && !match.some((pattern): boolean => !!path.match(pattern))) {    return false;  }  if (skip && skip.some((pattern): boolean => !!path.match(pattern))) {    return false;  }  return true;}
function wrapErrorWithRootPath(err: unknown, root: string) {  if (err instanceof Error && "root" in err) return err;  const e = new Error() as Error & { root: string };  e.root = root;  e.message = err instanceof Error    ? `${err.message} for path "${root}"`    : `[non-error thrown] for path "${root}"`;  e.stack = err instanceof Error ? err.stack : undefined;  e.cause = err instanceof Error ? err.cause : undefined;  return e;}
export interface WalkOptions {  maxDepth?: number;  includeFiles?: boolean;  includeDirs?: boolean;  followSymlinks?: boolean;  exts?: string[];  match?: RegExp[];  skip?: RegExp[];}export type { WalkEntry };
/** Walks the file tree rooted at root, yielding each file or directory in the * tree filtered according to the given options. The files are walked in lexical * order, which makes the output deterministic but means that for very large * directories walk() can be inefficient. * * Options: * - maxDepth?: number = Infinity; * - includeFiles?: boolean = true; * - includeDirs?: boolean = true; * - followSymlinks?: boolean = false; * - exts?: string[]; * - match?: RegExp[]; * - skip?: RegExp[]; * * ```ts *       import { walk } from "./walk.ts"; *       import { assert } from "../testing/asserts.ts"; * *       for await (const entry of walk(".")) { *         console.log(entry.path); *         assert(entry.isFile); *       } * ``` */export async function* walk(  root: string | URL,  {    maxDepth = Infinity,    includeFiles = true,    includeDirs = true,    followSymlinks = false,    exts = undefined,    match = undefined,    skip = undefined,  }: WalkOptions = {},): AsyncIterableIterator<WalkEntry> {  if (maxDepth < 0) {    return;  }  root = toPathString(root);  if (includeDirs && include(root, exts, match, skip)) {    yield await createWalkEntry(root);  }  if (maxDepth < 1 || !include(root, undefined, undefined, skip)) {    return;  }  try {    for await (const entry of Deno.readDir(root)) {      assert(entry.name != null);      let path = join(root, entry.name);
      let { isSymlink, isDirectory } = entry;
      if (isSymlink) {        if (!followSymlinks) continue;        path = await Deno.realPath(path);        // Caveat emptor: don't assume |path| is not a symlink. realpath()        // resolves symlinks but another process can replace the file system        // entity with a different type of entity before we call lstat().        ({ isSymlink, isDirectory } = await Deno.lstat(path));      }
      if (isSymlink || isDirectory) {        yield* walk(path, {          maxDepth: maxDepth - 1,          includeFiles,          includeDirs,          followSymlinks,          exts,          match,          skip,        });      } else if (includeFiles && include(path, exts, match, skip)) {        yield { path, ...entry };      }    }  } catch (err) {    throw wrapErrorWithRootPath(err, normalize(root));  }}
/** Same as walk() but uses synchronous ops */export function* walkSync(  root: string | URL,  {    maxDepth = Infinity,    includeFiles = true,    includeDirs = true,    followSymlinks = false,    exts = undefined,    match = undefined,    skip = undefined,  }: WalkOptions = {},): IterableIterator<WalkEntry> {  root = toPathString(root);  if (maxDepth < 0) {    return;  }  if (includeDirs && include(root, exts, match, skip)) {    yield createWalkEntrySync(root);  }  if (maxDepth < 1 || !include(root, undefined, undefined, skip)) {    return;  }  let entries;  try {    entries = Deno.readDirSync(root);  } catch (err) {    throw wrapErrorWithRootPath(err, normalize(root));  }  for (const entry of entries) {    assert(entry.name != null);    let path = join(root, entry.name);
    let { isSymlink, isDirectory } = entry;
    if (isSymlink) {      if (!followSymlinks) continue;      path = Deno.realPathSync(path);      // Caveat emptor: don't assume |path| is not a symlink. realpath()      // resolves symlinks but another process can replace the file system      // entity with a different type of entity before we call lstat().      ({ isSymlink, isDirectory } = Deno.lstatSync(path));    }
    if (isSymlink || isDirectory) {      yield* walkSync(path, {        maxDepth: maxDepth - 1,        includeFiles,        includeDirs,        followSymlinks,        exts,        match,        skip,      });    } else if (includeFiles && include(path, exts, match, skip)) {      yield { path, ...entry };    }  }}