denoland-deno/runtime/js/40_files.js

// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.

const core = globalThis.Deno.core;
const ops = core.ops;
import { read, readSync, write, writeSync } from "internal:runtime/js/12_io.js";
import {
  fstat,
  fstatSync,
  ftruncate,
  ftruncateSync,
} from "internal:runtime/js/30_fs.js";
import { pathFromURL } from "internal:runtime/js/06_util.js";
import {
  readableStreamForRid,
  writableStreamForRid,
} from "internal:deno_web/06_streams.js";
const primordials = globalThis.__bootstrap.primordials;
const {
  ArrayPrototypeFilter,
  Error,
  ObjectValues,
} = primordials;

function seekSync(
  rid,
  offset,
  whence,
) {
  return ops.op_seek_sync({ rid, offset, whence });
}

function seek(
  rid,
  offset,
  whence,
) {
  return core.opAsync("op_seek_async", { rid, offset, whence });
}

function openSync(
  path,
  options,
) {
  if (options) checkOpenOptions(options);
  const mode = options?.mode;
  const rid = ops.op_open_sync(
    pathFromURL(path),
    options,
    mode,
  );

  return new FsFile(rid);
}

async function open(
  path,
  options,
) {
  if (options) checkOpenOptions(options);
  const mode = options?.mode;
  const rid = await core.opAsync(
    "op_open_async",
    pathFromURL(path),
    options,
    mode,
  );

  return new FsFile(rid);
}

function createSync(path) {
  return openSync(path, {
    read: true,
    write: true,
    truncate: true,
    create: true,
  });
}

function create(path) {
  return open(path, {
    read: true,
    write: true,
    truncate: true,
    create: true,
  });
}

class FsFile {
  #rid = 0;

  #readable;
  #writable;

  constructor(rid) {
    this.#rid = rid;
  }

  get rid() {
    return this.#rid;
  }

  write(p) {
    return write(this.rid, p);
  }

  writeSync(p) {
    return writeSync(this.rid, p);
  }

  truncate(len) {
    return ftruncate(this.rid, len);
  }

  truncateSync(len) {
    return ftruncateSync(this.rid, len);
  }

  read(p) {
    return read(this.rid, p);
  }

  readSync(p) {
    return readSync(this.rid, p);
  }

  seek(offset, whence) {
    return seek(this.rid, offset, whence);
  }

  seekSync(offset, whence) {
    return seekSync(this.rid, offset, whence);
  }

  stat() {
    return fstat(this.rid);
  }

  statSync() {
    return fstatSync(this.rid);
  }

  close() {
    core.close(this.rid);
  }

  get readable() {
    if (this.#readable === undefined) {
      this.#readable = readableStreamForRid(this.rid);
    }
    return this.#readable;
  }

  get writable() {
    if (this.#writable === undefined) {
      this.#writable = writableStreamForRid(this.rid);
    }
    return this.#writable;
  }
}

class Stdin {
  #readable;

  constructor() {
  }

  get rid() {
    return 0;
  }

  read(p) {
    return read(this.rid, p);
  }

  readSync(p) {
    return readSync(this.rid, p);
  }

  close() {
    core.close(this.rid);
  }

  get readable() {
    if (this.#readable === undefined) {
      this.#readable = readableStreamForRid(this.rid);
    }
    return this.#readable;
  }

  setRaw(mode, options = {}) {
    const cbreak = !!(options.cbreak ?? false);
    ops.op_stdin_set_raw(mode, cbreak);
  }
}

class Stdout {
  #writable;

  constructor() {
  }

  get rid() {
    return 1;
  }

  write(p) {
    return write(this.rid, p);
  }

  writeSync(p) {
    return writeSync(this.rid, p);
  }

  close() {
    core.close(this.rid);
  }

  get writable() {
    if (this.#writable === undefined) {
      this.#writable = writableStreamForRid(this.rid);
    }
    return this.#writable;
  }
}

class Stderr {
  #writable;

  constructor() {
  }

  get rid() {
    return 2;
  }

  write(p) {
    return write(this.rid, p);
  }

  writeSync(p) {
    return writeSync(this.rid, p);
  }

  close() {
    core.close(this.rid);
  }

  get writable() {
    if (this.#writable === undefined) {
      this.#writable = writableStreamForRid(this.rid);
    }
    return this.#writable;
  }
}

const stdin = new Stdin();
const stdout = new Stdout();
const stderr = new Stderr();

function checkOpenOptions(options) {
  if (
    ArrayPrototypeFilter(
      ObjectValues(options),
      (val) => val === true,
    ).length === 0
  ) {
    throw new Error("OpenOptions requires at least one option to be true");
  }

  if (options.truncate && !options.write) {
    throw new Error("'truncate' option requires 'write' option");
  }

  const createOrCreateNewWithoutWriteOrAppend =
    (options.create || options.createNew) &&
    !(options.write || options.append);

  if (createOrCreateNewWithoutWriteOrAppend) {
    throw new Error(
      "'create' or 'createNew' options require 'write' or 'append' option",
    );
  }
}

const File = FsFile;
export {
  create,
  createSync,
  File,
  FsFile,
  open,
  openSync,
  seek,
  seekSync,
  stderr,
  stdin,
  stdout,
};