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LibJS: Implement WeakMap changes from 'Symbol as WeakMap Keys Proposal'

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This commit is contained in:
Idan Horowitz 2022-06-22 23:08:12 +03:00
parent 22a78e8a2c
commit a80d3fdf49
8 changed files with 39 additions and 18 deletions
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2
Userland/Libraries/LibJS/Tests/builtins/WeakMap/WeakMap.js
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@ -37,6 +37,6 @@ describe("regressions", () => {
test("missing key/value properties on iterable entry", () => {
expect(() => {
new WeakMap([{}]);
}).toThrowWithMessage(TypeError, "undefined is not an object");
}).toThrowWithMessage(TypeError, "undefined cannot be held weakly");
});
});

3
Userland/Libraries/LibJS/Tests/builtins/WeakMap/WeakMap.prototype.delete.js
View file

@ -5,9 +5,12 @@ test("basic functionality", () => {
[{ a: 1 }, 1],
[{ a: 2 }, 2],
[{ a: 3 }, 3],
[Symbol("foo"), "bar"],
];
const weakMap = new WeakMap(original);
expect(weakMap.delete(original[0][0])).toBeTrue();
expect(weakMap.delete(original[0][0])).toBeFalse();
expect(weakMap.delete(original[3][0])).toBeTrue();
expect(weakMap.delete(original[3][0])).toBeFalse();
expect(weakMap.delete(null)).toBeFalse();
});

2
Userland/Libraries/LibJS/Tests/builtins/WeakMap/WeakMap.prototype.get.js
View file

@ -5,8 +5,10 @@ test("basic functionality", () => {
[{ a: 1 }, 1],
[{ a: 2 }, 2],
[{ a: 3 }, 3],
[Symbol("foo"), "bar"],
];
const weakMap = new WeakMap(original);
expect(weakMap.get(original[0][0])).toBe(original[0][1]);
expect(weakMap.get(original[3][0])).toBe(original[3][1]);
expect(weakMap.get(null)).toBe(undefined);
});

2
Userland/Libraries/LibJS/Tests/builtins/WeakMap/WeakMap.prototype.has.js
View file

@ -7,10 +7,12 @@ test("basic functionality", () => {
[{ a: 1 }, 1],
[{ a: 2 }, 2],
[{ a: 3 }, 3],
[Symbol("foo"), "bar"],
];
var weakMap = new WeakMap(original);
expect(new WeakMap().has()).toBeFalse();
expect(weakMap.has(original[0][0])).toBeTrue();
expect(weakMap.has(original[3][0])).toBeTrue();
expect(weakMap.has({ a: 1 })).toBeFalse();
});

20
Userland/Libraries/LibJS/Tests/builtins/WeakMap/WeakMap.prototype.set.js
View file

@ -5,9 +5,11 @@ test("basic functionality", () => {
[{ a: 1 }, 1],
[{ a: 2 }, 2],
[{ a: 3 }, 3],
[Symbol("foo"), "bar"],
]);
expect(weakMap.set({ a: 4 }, 4)).toBe(weakMap);
expect(weakMap.set({ a: 1 }, 2)).toBe(weakMap);
expect(weakMap.set(Symbol("hello"), "friends")).toBe(weakMap);
});
test("invalid values", () => {
@ -15,18 +17,28 @@ test("invalid values", () => {
[-100, Infinity, NaN, "hello", 152n].forEach(value => {
expect(() => {
weakMap.set(value, value);
}).toThrowWithMessage(TypeError, "is not an object");
}).toThrowWithMessage(TypeError, "cannot be held weakly");
});
});
test("automatic removal of garbage-collected values", () => {
const weakMap = new WeakMap();
const key = { e: 3 };
const objectKey = { e: 3 };
expect(weakMap.set(key, 1)).toBe(weakMap);
expect(weakMap.set(objectKey, 1)).toBe(weakMap);
expect(getWeakMapSize(weakMap)).toBe(1);
markAsGarbage("key");
markAsGarbage("objectKey");
gc();
expect(getWeakMapSize(weakMap)).toBe(0);
const symbolKey = Symbol("foo");
expect(weakMap.set(symbolKey, "bar")).toBe(weakMap);
expect(getWeakMapSize(weakMap)).toBe(1);
markAsGarbage("symbolKey");
gc();
expect(getWeakMapSize(weakMap)).toBe(0);