All files / src/node Stats.ts

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import { Node } from '../node';
import { constants } from '../constants';
 
const { S_IFMT, S_IFDIR, S_IFREG, S_IFBLK, S_IFCHR, S_IFLNK, S_IFIFO, S_IFSOCK } = constants;
 
export type TStatNumber = number | bigint;
 
/**
 * Statistics about a file/directory, like `fs.Stats`.
 */
export class Stats<T = TStatNumber> {
  static build(node: Node, bigint: false): Stats<number>;
  static build(node: Node, bigint: true): Stats<bigint>;
  static build(node: Node, bigint?: boolean): Stats<TStatNumber>;
  static build(node: Node, bigint: boolean = false): Stats<TStatNumber> {
    const stats = new Stats<TStatNumber>();
    const { uid, gid, atime, mtime, ctime } = node;
 
    const getStatNumber = !bigint ? number => number : number => BigInt(number);
 
    // Copy all values on Stats from Node, so that if Node values
    // change, values on Stats would still be the old ones,
    // just like in Node fs.
 
    stats.uid = getStatNumber(uid);
    stats.gid = getStatNumber(gid);
 
    stats.rdev = getStatNumber(node.rdev);
    stats.blksize = getStatNumber(4096);
    stats.ino = getStatNumber(node.ino);
    stats.size = getStatNumber(node.getSize());
    stats.blocks = getStatNumber(1);
 
    stats.atime = atime;
    stats.mtime = mtime;
    stats.ctime = ctime;
    stats.birthtime = ctime;
 
    stats.atimeMs = getStatNumber(atime.getTime());
    stats.mtimeMs = getStatNumber(mtime.getTime());
    const ctimeMs = getStatNumber(ctime.getTime());
    stats.ctimeMs = ctimeMs;
    stats.birthtimeMs = ctimeMs;
 
    if (bigint) {
      stats.atimeNs = BigInt(atime.getTime()) * BigInt(1000000);
      stats.mtimeNs = BigInt(mtime.getTime()) * BigInt(1000000);
      const ctimeNs = BigInt(ctime.getTime()) * BigInt(1000000);
      stats.ctimeNs = ctimeNs;
      stats.birthtimeNs = ctimeNs;
    }
 
    stats.dev = getStatNumber(0);
    stats.mode = getStatNumber(node.mode);
    stats.nlink = getStatNumber(node.nlink);
 
    return stats;
  }
 
  uid: T;
  gid: T;
 
  rdev: T;
  blksize: T;
  ino: T;
  size: T;
  blocks: T;
 
  atime: Date;
  mtime: Date;
  ctime: Date;
  birthtime: Date;
 
  atimeMs: T;
  mtimeMs: T;
  ctimeMs: T;
  birthtimeMs: T;
 
  // additional properties that exist when bigint is true
  atimeNs: T extends bigint ? T : undefined;
  mtimeNs: T extends bigint ? T : undefined;
  ctimeNs: T extends bigint ? T : undefined;
  birthtimeNs: T extends bigint ? T : undefined;
 
  dev: T;
  mode: T;
  nlink: T;
 
  private _checkModeProperty(property: number): boolean {
    return (Number(this.mode) & S_IFMT) === property;
  }
 
  isDirectory(): boolean {
    return this._checkModeProperty(S_IFDIR);
  }
 
  isFile(): boolean {
    return this._checkModeProperty(S_IFREG);
  }
 
  isBlockDevice(): boolean {
    return this._checkModeProperty(S_IFBLK);
  }
 
  isCharacterDevice(): boolean {
    return this._checkModeProperty(S_IFCHR);
  }
 
  isSymbolicLink(): boolean {
    return this._checkModeProperty(S_IFLNK);
  }
 
  isFIFO(): boolean {
    return this._checkModeProperty(S_IFIFO);
  }
 
  isSocket(): boolean {
    return this._checkModeProperty(S_IFSOCK);
  }
}
 
export default Stats;