backend/libs/three/loaders/LoaderUtils.js

class LoaderUtils {
	static decodeText(array) {
		if (typeof TextDecoder !== 'undefined') {
			return new TextDecoder().decode(array);
		}

		// Avoid the String.fromCharCode.apply(null, array) shortcut, which
		// throws a "maximum call stack size exceeded" error for large arrays.

		let s = '';

		for (let i = 0, il = array.length; i < il; i++) {
			// Implicitly assumes little-endian.
			s += String.fromCharCode(array[i]);
		}

		try {
			// merges multi-byte utf-8 characters.

			return decodeURIComponent(escape(s));
		} catch (e) {
			// see #16358

			return s;
		}
	}

	static extractUrlBase(url) {
		const index = url.lastIndexOf('/');

		if (index === -1) return './';

		return url.substr(0, index + 1);
	}

	static resolveURL(url, path) {
		// Invalid URL
		if (typeof url !== 'string' || url === '') return '';

		// Host Relative URL
		if (/^https?:\/\//i.test(path) && /^\//.test(url)) {
			path = path.replace(/(^https?:\/\/[^\/]+).*/i, '$1');
		}

		// Absolute URL http://,https://,//
		if (/^(https?:)?\/\//i.test(url)) return url;

		// Data URI
		if (/^data:.*,.*$/i.test(url)) return url;

		// Blob URL
		if (/^blob:.*$/i.test(url)) return url;

		// Relative URL
		return path + url;
	}
}

export { LoaderUtils };