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LibJS: Add TypedArraySpeciesCreate and %TypedArray%.prototype.filter

I'm not too happy with how I get the default constructor in
typed_array_species_create, but it works for now.
This commit is contained in:
Luke 2021-07-09 06:20:45 +01:00 committed by Linus Groh
parent 53bc3f8e3b
commit bc6f619344
3 changed files with 323 additions and 0 deletions

View file

@ -0,0 +1,217 @@
const TYPED_ARRAYS = [
Uint8Array,
Uint8ClampedArray,
Uint16Array,
Uint32Array,
Int8Array,
Int16Array,
Int32Array,
Float32Array,
Float64Array,
];
const BIGINT_TYPED_ARRAYS = [BigUint64Array, BigInt64Array];
test("length is 1", () => {
TYPED_ARRAYS.forEach(T => {
expect(T.prototype.filter).toHaveLength(1);
});
BIGINT_TYPED_ARRAYS.forEach(T => {
expect(T.prototype.filter).toHaveLength(1);
});
});
describe("errors", () => {
function argumentErrorTests(T) {
test(`requires at least one argument (${T.name})`, () => {
expect(() => {
new T().filter();
}).toThrowWithMessage(
TypeError,
"TypedArray.prototype.filter() requires at least one argument"
);
});
test(`callback must be a function (${T.name})`, () => {
expect(() => {
new T().filter(undefined);
}).toThrowWithMessage(TypeError, "undefined is not a function");
});
}
TYPED_ARRAYS.forEach(T => argumentErrorTests(T));
BIGINT_TYPED_ARRAYS.forEach(T => argumentErrorTests(T));
test("Symbol.species returns a typed array with a different content type", () => {
TYPED_ARRAYS.forEach(T => {
class TypedArray extends T {
static get [Symbol.species]() {
return BigUint64Array;
}
}
let result;
expect(() => {
result = new TypedArray().filter(() => {});
}).toThrowWithMessage(TypeError, `Can't create BigUint64Array from ${T.name}`);
expect(result).toBeUndefined();
});
BIGINT_TYPED_ARRAYS.forEach(T => {
class TypedArray extends T {
static get [Symbol.species]() {
return Uint32Array;
}
}
let result;
expect(() => {
result = new TypedArray().filter(() => {});
}).toThrowWithMessage(TypeError, `Can't create Uint32Array from ${T.name}`);
expect(result).toBeUndefined();
});
});
test("Symbol.species doesn't return a typed array", () => {
TYPED_ARRAYS.forEach(T => {
class TypedArray extends T {
static get [Symbol.species]() {
return Array;
}
}
let result;
expect(() => {
result = new TypedArray().filter(() => {});
}).toThrowWithMessage(TypeError, "Not a TypedArray object");
expect(result).toBeUndefined();
});
BIGINT_TYPED_ARRAYS.forEach(T => {
class TypedArray extends T {
static get [Symbol.species]() {
return Array;
}
}
let result;
expect(() => {
result = new TypedArray().filter(() => {});
}).toThrowWithMessage(TypeError, "Not a TypedArray object");
expect(result).toBeUndefined();
});
});
});
describe("normal behaviour", () => {
test("never calls callback with empty array", () => {
TYPED_ARRAYS.forEach(T => {
let callbackCalled = 0;
expect(
new T([]).filter(() => {
callbackCalled++;
})
).toHaveLength(0);
expect(callbackCalled).toBe(0);
});
BIGINT_TYPED_ARRAYS.forEach(T => {
let callbackCalled = 0;
expect(
new T([]).filter(() => {
callbackCalled++;
})
).toHaveLength(0);
expect(callbackCalled).toBe(0);
});
});
test("calls callback once for every item", () => {
TYPED_ARRAYS.forEach(T => {
let callbackCalled = 0;
expect(
new T([1, 2, 3]).filter(() => {
callbackCalled++;
})
).toHaveLength(0);
expect(callbackCalled).toBe(3);
});
BIGINT_TYPED_ARRAYS.forEach(T => {
let callbackCalled = 0;
expect(
new T([1n, 2n, 3n]).filter(() => {
callbackCalled++;
})
).toHaveLength(0);
expect(callbackCalled).toBe(3);
});
});
test("can filter based on callback return value", () => {
TYPED_ARRAYS.forEach(T => {
const evenNumbers = new T([0, 1, 2, 3, 4, 5, 6, 7]).filter(x => x % 2 === 0);
expect(evenNumbers).toHaveLength(4);
expect(evenNumbers[0]).toBe(0);
expect(evenNumbers[1]).toBe(2);
expect(evenNumbers[2]).toBe(4);
expect(evenNumbers[3]).toBe(6);
});
BIGINT_TYPED_ARRAYS.forEach(T => {
const evenNumbers = new T([0n, 1n, 2n, 3n, 4n, 5n, 6n, 7n]).filter(x => x % 2n === 0n);
expect(evenNumbers).toHaveLength(4);
expect(evenNumbers[0]).toBe(0n);
expect(evenNumbers[1]).toBe(2n);
expect(evenNumbers[2]).toBe(4n);
expect(evenNumbers[3]).toBe(6n);
});
});
test("Symbol.species returns a typed array with a matching content type", () => {
TYPED_ARRAYS.forEach(T => {
class TypedArray extends T {
static get [Symbol.species]() {
return Uint32Array;
}
}
let result;
expect(() => {
result = new TypedArray([1, 2, 3]).filter(value => value % 2 === 0);
}).not.toThrowWithMessage(TypeError, `Can't create Uint32Array from ${T.name}`);
expect(result).toBeInstanceOf(Uint32Array);
expect(result).toHaveLength(1);
expect(result[0]).toBe(2);
});
BIGINT_TYPED_ARRAYS.forEach(T => {
class TypedArray extends T {
static get [Symbol.species]() {
return BigUint64Array;
}
}
let result;
expect(() => {
result = new TypedArray([1n, 2n, 3n]).filter(value => value % 2n === 0n);
}).not.toThrowWithMessage(TypeError, `Can't create BigUint64Array from ${T.name}`);
expect(result).toBeInstanceOf(BigUint64Array);
expect(result).toHaveLength(1);
expect(result[0]).toBe(2n);
});
});
});