test/_util/logCall.js - main - githubmirror/preact

test/_util/logCall.js

85 строк2 KB

jdecroock

Experiment: add moveBefore rather than insertBefor when available

16 июл 2026, 19:05

16 июл 2026, 19:050273151

/**
 * Serialize an object
 * @param {Object} obj
 * @return {string}
 */
function serialize(obj) {
	if (obj instanceof Text) return '#text';
	if (obj instanceof Element) return `<${obj.localName}>${obj.textContent}`;
	if (obj === document) return 'document';
	if (typeof obj == 'string') return obj;
	return Object.prototype.toString.call(obj).replace(/(^\[object |\]$)/g, '');
}

/** @type {string[]} */
let log = [];

/**
 * Modify obj's original method to log calls and arguments on logger object
 * @template T
 * @param {T} obj
 * @param {keyof T} method
 */
export function logCall(obj, method) {
	let old = obj[method];
	obj[method] = function (...args) {
		let c = '';
		for (let i = 0; i < args.length; i++) {
			if (c) c += ', ';
			c += serialize(args[i]);
		}

		let operation;
		switch (method) {
			case 'insertBefore': {
				if (args[1] === null && args.length === 2) {
					operation = `${serialize(this)}.appendChild(${serialize(args[0])})`;
				} else {
					operation = `${serialize(this)}.${String(method)}(${c})`;
				}
				break;
			}
			case 'moveBefore': {
				if (args[1] === null && args.length === 2) {
					operation = `${serialize(this)}.appendChild(${serialize(args[0])})`;
				} else {
					operation = `${serialize(this)}.insertBefore(${c})`;
				}
				break;
			}
			default: {
				operation = `${serialize(this)}.${String(method)}(${c})`;
				break;
			}
		}

		log.push(operation);
		return old.apply(this, args);
	};

	return () => (obj[method] = old);
}

/**
 * Return log object
 * @return {string[]} log
 */
export function getLog() {
	return log;
}

/** Clear log object */
export function clearLog() {
	log = [];
}

export function getLogSummary() {
	/** @type {{ [key: string]: number }} */
	const summary = {};

	for (let entry of log) {
		summary[entry] = (summary[entry] || 0) + 1;
	}

	return summary;
}