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

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

import { CompressUtils } from './compress-utils.js';

/**
 * Reconstruct original object field names in a compressed scene.
 */ class Decompress {
    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);
    }
    /**
     * 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;
    }
}

export { Decompress };