playcanvas/build/playcanvas.dbg/src/scene/compress/decompress.js

Open-source WebGL/WebGPU 3D engine for the web

import { CompressUtils } from "./compress-utils.js";
class Decompress {
  /**
   * Create a new Decompress instance.
   *
   * @param {object} node - The current node of the object being decompressed, initially the
   * 'entities' field of a scene.
   * @param {object} data - Compression metadata.
   */
  constructor(node, data) {
    this._node = node;
    this._data = data;
  }
  run() {
    const type = Object.prototype.toString.call(this._node);
    if (type === "[object Object]") {
      this._handleMap();
    } else if (type === "[object Array]") {
      this._handleArray();
    } else {
      this._result = this._node;
    }
    return this._result;
  }
  _handleMap() {
    this._result = {};
    const a = Object.keys(this._node);
    a.forEach(this._handleKey, this);
  }
  _handleKey(origKey) {
    let newKey = origKey;
    const len = origKey.length;
    if (len === 1) {
      newKey = CompressUtils.oneCharToKey(origKey, this._data);
    } else if (len === 2) {
      newKey = CompressUtils.multCharToKey(origKey, this._data);
    }
    this._result[newKey] = new Decompress(this._node[origKey], this._data).run();
  }
  _handleArray() {
    this._result = [];
    this._node.forEach(this._handleArElt, this);
  }
  _handleArElt(elt) {
    const v = new Decompress(elt, this._data).run();
    this._result.push(v);
  }
}
export {
  Decompress
};