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// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Based on Mozilla Array.of() tests at http://dxr.mozilla.org/mozilla-central/source/js/src/jit-test/tests/collections
var typedArrayConstructors = [
Uint8Array,
Int8Array,
Uint16Array,
Int16Array,
Uint32Array,
Int32Array,
Uint8ClampedArray,
Float32Array,
Float64Array];
function TestTypedArrayOf(constructor) {
// %TypedArray%.of basics.
var a = constructor.of();
assertEquals(0, a.length);
assertEquals(constructor.prototype, Object.getPrototypeOf(a));
assertEquals(false, Array.isArray(a));
// Items are coerced to numerical values.
a = constructor.of(undefined, null, [], true, false, 3.14);
// For typed arrays of floating point values, values are not rounded.
if (constructor === Float32Array || constructor === Float64Array) {
assertEquals(NaN, a[0]);
assertEquals(0, a[1]);
assertEquals(0, a[2]);
assertEquals(1, a[3]);
assertEquals(0, a[4]);
assertEquals(true, Math.abs(a[5] - 3.14) < 1e-6);
} else {
assertEquals(0, a[0]);
assertEquals(0, a[1]);
assertEquals(0, a[2]);
assertEquals(1, a[3]);
assertEquals(0, a[4]);
assertEquals(3, a[5]);
}
var aux = [];
for (var i = 0; i < 100; i++)
aux[i] = i;
a = constructor.of.apply(constructor, aux);
assertEquals(aux.length, a.length);
assertArrayEquals(aux, a);
// %TypedArray%.of can be transplanted to other constructors.
var hits = 0;
function Bag(length) {
assertEquals(arguments.length, 1);
assertEquals(length, 2);
this.length = length;
hits++;
}
Bag.of = constructor.of;
hits = 0;
a = Bag.of("zero", "one");
assertEquals(1, hits);
assertEquals(2, a.length);
assertArrayEquals(["zero", "one"], a);
assertEquals(Bag.prototype, a.__proto__);
hits = 0;
actual = constructor.of.call(Bag, "zero", "one");
assertEquals(1, hits);
assertEquals(2, a.length);
assertArrayEquals(["zero", "one"], a);
assertEquals(Bag.prototype, a.__proto__);
// %TypedArray%.of does not trigger prototype setters.
// (It defines elements rather than assigning to them.)
var status = "pass";
Object.defineProperty(constructor.prototype, "0", {
set: function(v) { status = "fail"; }
});
assertEquals(1, constructor.of(1)[0], 1);
assertEquals("pass", status);
// Note that %TypedArray%.of does not trigger "length" setter itself, as
// it relies on the constructor to set "length" to the value passed to it.
// If the constructor does not assign "length", the setter should not be
// invoked.
// Setter on the newly created object.
function Pack() {
Object.defineProperty(this, "length", {
set: function (v) { status = "fail"; }
});
}
Pack.of = constructor.of;
var pack = Pack.of("wolves", "cards", "cigarettes", "lies");
assertEquals("pass", status);
// when the setter is on the new object's prototype
function Bevy() {}
Object.defineProperty(Bevy.prototype, "length", {
set: function (v) { status = "fail"; }
});
Bevy.of = constructor.of;
var bevy = Bevy.of("quail");
assertEquals("pass", status);
// Check superficial features of %TypedArray%.of.
var desc = Object.getOwnPropertyDescriptor(constructor, "of");
assertEquals(desc.configurable, false);
assertEquals(desc.enumerable, false);
assertEquals(desc.writable, false);
assertEquals(constructor.of.length, 0);
// %TypedArray%.of is not a constructor.
assertThrows(function() { new constructor.of(); }, TypeError);
// For receivers which are not constructors %TypedArray%.of does not
// allocate a typed array using a default constructor, but throws an
// exception. Note that this is different from Array.of, which uses
// Array as default constructor.
for (var x of [undefined, null, false, true, "cow", 42, 3.14]) {
assertThrows(function () { constructor.of.call(x); }, TypeError);
}
}
for (var constructor of typedArrayConstructors) {
TestTypedArrayOf(constructor);
}
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