surma
d44f1d9677
Checkpoint before integration and package validation. Assisted-by: SurmAgent:unknown [read] [edit] [bash]
98 lines
3.2 KiB
JavaScript
98 lines
3.2 KiB
JavaScript
// https://github.com/quickjs-ng/quickjs/issues/1795
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import { assert, assertArrayEquals } from "./assert.js";
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// 1. Array.fromAsync must not look up .call on mapper function (iterable source).
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{
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function mapper(x) { return x * 10; }
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mapper.call = function () { return "hijacked"; };
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const res = await Array.fromAsync([1, 2], mapper);
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assertArrayEquals(res, [10, 20]);
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}
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// 2. Array.fromAsync must not look up .call on mapper function (array-like source).
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{
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function mapper(x) { return x * 10; }
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mapper.call = function () { return "hijacked"; };
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const res = await Array.fromAsync({ length: 2, 0: 1, 1: 2 }, mapper);
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assertArrayEquals(res, [10, 20]);
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}
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// 3. Array.fromAsync must not look up .call on iterator method ([Symbol.iterator]).
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{
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const method = function () { return [1, 2].values(); };
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method.call = function () { return ["hijacked"].values(); };
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const res = await Array.fromAsync({ [Symbol.iterator]: method });
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assertArrayEquals(res, [1, 2]);
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}
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// 4. Array.fromAsync must not look up .call on async iterator method ([Symbol.asyncIterator]).
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{
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const asyncMethod = async function* () { yield 1; yield 2; };
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asyncMethod.call = function () { throw new Error("hijacked"); };
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const res = await Array.fromAsync({ [Symbol.asyncIterator]: asyncMethod });
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assertArrayEquals(res, [1, 2]);
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}
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// 5. Array.fromAsync works even if mapper.call or method.call is not callable (null or primitive).
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{
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const mapper = (x) => x + 1;
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mapper.call = null;
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const res = await Array.fromAsync([10, 20], mapper);
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assertArrayEquals(res, [11, 21]);
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}
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{
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const method = function* () { yield 3; yield 4; };
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method.call = 123;
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const res = await Array.fromAsync({ [Symbol.iterator]: method });
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assertArrayEquals(res, [3, 4]);
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}
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// 6. Verify thisArg and index parameters are passed correctly to mapper.
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{
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const thisObj = { multiplier: 3 };
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const indices = [];
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const thisReceivers = [];
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function mapper(val, idx) {
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indices.push(idx);
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thisReceivers.push(this);
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return val * this.multiplier;
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}
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mapper.call = null;
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const res = await Array.fromAsync([5, 6], mapper, thisObj);
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assertArrayEquals(res, [15, 18]);
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assertArrayEquals(indices, [0, 1]);
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assert(thisReceivers[0], thisObj);
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assert(thisReceivers[1], thisObj);
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}
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{
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const thisObj = { multiplier: 4 };
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const indices = [];
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const thisReceivers = [];
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function mapper(val, idx) {
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indices.push(idx);
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thisReceivers.push(this);
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return val * this.multiplier;
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}
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mapper.call = null;
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const res = await Array.fromAsync({ length: 2, 0: 5, 1: 6 }, mapper, thisObj);
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assertArrayEquals(res, [20, 24]);
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assertArrayEquals(indices, [0, 1]);
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assert(thisReceivers[0], thisObj);
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assert(thisReceivers[1], thisObj);
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}
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// 7. Verify receiver (this) for iterator method is the arrayLike object.
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{
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let receivedThis = null;
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const obj = {
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[Symbol.iterator]() {
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receivedThis = this;
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return [7, 8].values();
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}
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};
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obj[Symbol.iterator].call = null;
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const res = await Array.fromAsync(obj);
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assertArrayEquals(res, [7, 8]);
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assert(receivedThis, obj);
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}
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