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fix(assert): check property equality up the prototype chain (#6153)
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lionel-rowe
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parent
bc20dbe21b
commit
63fdf8d090
174
assert/equal.ts
174
assert/equal.ts
@ -6,17 +6,92 @@ function isKeyedCollection(x: unknown): x is KeyedCollection {
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return x instanceof Set || x instanceof Map;
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}
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function constructorsEqual(a: object, b: object) {
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return a.constructor === b.constructor ||
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a.constructor === Object && !b.constructor ||
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!a.constructor && b.constructor === Object;
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function prototypesEqual(a: object, b: object) {
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const pa = Object.getPrototypeOf(a);
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const pb = Object.getPrototypeOf(b);
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return pa === pb ||
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pa === Object.prototype && pb === null ||
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pa === null && pb === Object.prototype;
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}
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function isBasicObjectOrArray(obj: object) {
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const proto = Object.getPrototypeOf(obj);
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return proto === null || proto === Object.prototype ||
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proto === Array.prototype;
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}
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// Slightly faster than Reflect.ownKeys in V8 as of 12.9.202.13-rusty (2024-10-28)
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function ownKeys(obj: object) {
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return [
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...Object.getOwnPropertyNames(obj),
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...Object.getOwnPropertySymbols(obj),
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];
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}
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function getKeysDeep(obj: object) {
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const keys = new Set<string | symbol>();
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while (obj !== Object.prototype && obj !== Array.prototype && obj != null) {
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for (const key of ownKeys(obj)) {
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keys.add(key);
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}
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obj = Object.getPrototypeOf(obj);
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}
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return keys;
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}
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// deno-lint-ignore no-explicit-any
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const Temporal: any = (globalThis as any).Temporal ??
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new Proxy({}, { get: () => {} });
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/** A non-exhaustive list of prototypes that can be accurately fast-path compared with `String(instance)` */
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const stringComparablePrototypes = new Set<unknown>(
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[
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Intl.Locale,
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RegExp,
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Temporal.Duration,
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Temporal.Instant,
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Temporal.PlainDate,
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Temporal.PlainDateTime,
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Temporal.PlainTime,
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Temporal.PlainYearMonth,
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Temporal.PlainMonthDay,
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Temporal.ZonedDateTime,
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URL,
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URLSearchParams,
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].filter((x) => x != null).map((x) => x.prototype),
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);
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function isPrimitive(x: unknown) {
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return typeof x === "string" ||
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typeof x === "number" ||
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typeof x === "boolean" ||
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typeof x === "bigint" ||
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typeof x === "symbol" ||
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x == null;
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}
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type TypedArray = Pick<Uint8Array | BigUint64Array, "length" | number>;
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const TypedArray = Object.getPrototypeOf(Uint8Array);
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function compareTypedArrays(a: TypedArray, b: TypedArray) {
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if (a.length !== b.length) return false;
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for (let i = 0; i < b.length; i++) {
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if (!sameValueZero(a[i], b[i])) return false;
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}
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return true;
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}
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/** Check both strict equality (`0 == -0`) and `Object.is` (`NaN == NaN`) */
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function sameValueZero(a: unknown, b: unknown) {
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return a === b || Object.is(a, b);
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}
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/**
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* Deep equality comparison used in assertions.
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*
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* @param c The actual value
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* @param d The expected value
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* @param a The actual value
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* @param b The expected value
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* @returns `true` if the values are deeply equal, `false` otherwise
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*
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* @example Usage
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@ -24,53 +99,33 @@ function constructorsEqual(a: object, b: object) {
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* import { equal } from "@std/assert/equal";
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*
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* equal({ foo: "bar" }, { foo: "bar" }); // Returns `true`
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* equal({ foo: "bar" }, { foo: "baz" }); // Returns `false
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* equal({ foo: "bar" }, { foo: "baz" }); // Returns `false`
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* ```
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*/
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export function equal(c: unknown, d: unknown): boolean {
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const seen = new Map();
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export function equal(a: unknown, b: unknown): boolean {
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const seen = new Map<unknown, unknown>();
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return (function compare(a: unknown, b: unknown): boolean {
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// Have to render RegExp & Date for string comparison
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// unless it's mistreated as object
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if (
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a &&
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b &&
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((a instanceof RegExp && b instanceof RegExp) ||
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(a instanceof URL && b instanceof URL))
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) {
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return String(a) === String(b);
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}
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if (sameValueZero(a, b)) return true;
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if (isPrimitive(a) || isPrimitive(b)) return false;
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if (a instanceof Date && b instanceof Date) {
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const aTime = a.getTime();
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const bTime = b.getTime();
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// Check for NaN equality manually since NaN is not
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// equal to itself.
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if (Number.isNaN(aTime) && Number.isNaN(bTime)) {
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return true;
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}
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return aTime === bTime;
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}
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if (typeof a === "number" && typeof b === "number") {
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return Number.isNaN(a) && Number.isNaN(b) || a === b;
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}
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if (Object.is(a, b)) {
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return true;
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return Object.is(a.getTime(), b.getTime());
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}
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if (a && typeof a === "object" && b && typeof b === "object") {
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if (a && b && !constructorsEqual(a, b)) {
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if (!prototypesEqual(a, b)) {
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return false;
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}
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if (a instanceof WeakMap || b instanceof WeakMap) {
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if (!(a instanceof WeakMap && b instanceof WeakMap)) return false;
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if (a instanceof TypedArray) {
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return compareTypedArrays(a as TypedArray, b as TypedArray);
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}
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if (a instanceof WeakMap) {
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throw new TypeError("cannot compare WeakMap instances");
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}
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if (a instanceof WeakSet || b instanceof WeakSet) {
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if (!(a instanceof WeakSet && b instanceof WeakSet)) return false;
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if (a instanceof WeakSet) {
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throw new TypeError("cannot compare WeakSet instances");
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}
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if (a instanceof WeakRef || b instanceof WeakRef) {
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if (!(a instanceof WeakRef && b instanceof WeakRef)) return false;
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return compare(a.deref(), b.deref());
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if (a instanceof WeakRef) {
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return compare(a.deref(), (b as WeakRef<WeakKey>).deref());
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}
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if (seen.get(a) === b) {
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return true;
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@ -85,14 +140,7 @@ export function equal(c: unknown, d: unknown): boolean {
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}
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const aKeys = [...a.keys()];
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const primitiveKeysFastPath = aKeys.every((k) => {
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return typeof k === "string" ||
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typeof k === "number" ||
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typeof k === "boolean" ||
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typeof k === "bigint" ||
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typeof k === "symbol" ||
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k == null;
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});
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const primitiveKeysFastPath = aKeys.every(isPrimitive);
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if (primitiveKeysFastPath) {
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if (a instanceof Set) {
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return a.symmetricDifference(b).size === 0;
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@ -130,15 +178,23 @@ export function equal(c: unknown, d: unknown): boolean {
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return unmatchedEntries === 0;
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}
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const merged = { ...a, ...b };
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for (
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const key of [
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...Object.getOwnPropertyNames(merged),
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...Object.getOwnPropertySymbols(merged),
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]
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) {
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type Key = keyof typeof merged;
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if (!compare(a && a[key as Key], b && b[key as Key])) {
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let keys: Iterable<string | symbol>;
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if (isBasicObjectOrArray(a)) {
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// fast path
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keys = ownKeys({ ...a, ...b });
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} else if (stringComparablePrototypes.has(Object.getPrototypeOf(a))) {
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// medium path
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return String(a) === String(b);
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} else {
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// slow path
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keys = getKeysDeep(a).union(getKeysDeep(b));
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}
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for (const key of keys) {
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type Key = keyof typeof a;
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if (!compare(a[key as Key], b[key as Key])) {
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return false;
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}
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if (((key in a) && (!(key in b))) || ((key in b) && (!(key in a)))) {
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@ -148,5 +204,5 @@ export function equal(c: unknown, d: unknown): boolean {
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return true;
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}
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return false;
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})(c, d);
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})(a, b);
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}
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@ -344,3 +344,149 @@ Deno.test("equal() keyed collection edge cases", () => {
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new Map([[1, { a: 1 }], [2, { b: 3 }]]),
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));
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});
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Deno.test("equal() with constructor and prototype", async (t) => {
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await t.step(
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"value-equal but reference-unequal property named `constructor`",
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() => {
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assert(equal(
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{ constructor: { x: 1 } },
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{ constructor: { x: 1 } },
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));
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},
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);
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await t.step(
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"instance vs plain object with property named `constructor`",
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() => {
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class X {}
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const a = new X();
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const b = { constructor: X };
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assert(equal(a.constructor, b.constructor));
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assertFalse(equal(a, b));
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},
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);
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await t.step("manually set prototype", () => {
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class X {
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prop = 1;
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}
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const a = new X();
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const b = {} as X;
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// false as prototype differs
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assertFalse(equal(a, b));
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Object.setPrototypeOf(b, X.prototype);
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// still false as `prop` is not set
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assertFalse(equal(a, b));
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b.prop = 1;
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// now true
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assert(equal(a, b));
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});
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});
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Deno.test("equal() with dynamic properties defined on the prototype", async (t) => {
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await t.step("built-in web APIs", async (t) => {
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await t.step("URLPattern", () => {
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assert(equal(
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new URLPattern("*://*.*"),
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new URLPattern("*://*.*"),
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));
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assertFalse(equal(
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new URLPattern("*://*.*"),
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new URLPattern("*://*.com"),
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));
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});
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await t.step("URLSearchParams", () => {
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assert(equal(
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new URLSearchParams("a=1&b=2"),
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new URLSearchParams("a=1&b=2"),
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));
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assertFalse(equal(
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new URLSearchParams("a=1&b=2"),
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new URLSearchParams("a=1&b=99999"),
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));
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});
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await t.step("Intl.Locale", () => {
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assert(equal(
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new Intl.Locale("es-MX"),
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new Intl.Locale("es-MX"),
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));
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assertFalse(equal(
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new Intl.Locale("es-MX"),
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new Intl.Locale("pt-BR"),
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));
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});
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});
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await t.step("custom prototype", () => {
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type Obj = {
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prop: number;
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};
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const wm = new WeakMap<Obj, number>();
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const proto: Obj = {
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get prop() {
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return wm.get(this)!;
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},
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};
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const makeObj = (val: number): Obj => {
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const x = Object.create(proto);
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wm.set(x, val);
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return x;
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};
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assert(equal(
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makeObj(1),
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makeObj(1),
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));
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assertFalse(equal(
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makeObj(1),
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makeObj(99999),
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));
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});
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});
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Deno.test("equal() with typed arrays", async (t) => {
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await t.step("Uint8Array", async (t) => {
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await t.step("equal", () => {
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assert(equal(
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new Uint8Array([1, 2, 3]),
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new Uint8Array([1, 2, 3]),
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));
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});
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await t.step("unequal", () => {
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assertFalse(equal(
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new Uint8Array([1, 2, 3]),
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new Uint8Array([1, 2, 4]),
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));
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});
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await t.step("length unequal", () => {
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assertFalse(equal(
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new Uint8Array([0]),
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new Uint8Array([0, 0]),
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));
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});
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});
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await t.step("Float64Array", async (t) => {
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await t.step("NaN == NaN", () => {
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assert(equal(
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new Float64Array([NaN]),
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new Float64Array([NaN]),
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));
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});
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await t.step("0 == -0", () => {
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assert(equal(
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new Float64Array([0]),
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new Float64Array([-0]),
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));
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});
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});
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});
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