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js/src/jit-test/tests/for-of/string-iterator-surfaces.js@6474c204b198 (annotated)

js/src/jit-test/tests/for-of/string-iterator-surfaces.js

Wed, 31 Dec 2014 06:09:35 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Wed, 31 Dec 2014 06:09:35 +0100

changeset 0

6474c204b198

permissions

-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

michael@0	1	// String.prototype[@@iterator] and StringIterator.prototype surface tests
michael@0	2
michael@0	3	load(libdir + "array-compare.js");
michael@0	4	load(libdir + "asserts.js");
michael@0	5	load(libdir + "iteration.js");
michael@0	6
michael@0	7	function assertDataDescriptor(actual, expected) {
michael@0	8	assertEq(actual.value, expected.value);
michael@0	9	assertEq(actual.writable, expected.writable);
michael@0	10	assertEq(actual.enumerable, expected.enumerable);
michael@0	11	assertEq(actual.configurable, expected.configurable);
michael@0	12	}
michael@0	13
michael@0	14	function isConstructor(o) {
michael@0	15	try {
michael@0	16	new (new Proxy(o, {construct: () => ({})}));
michael@0	17	return true;
michael@0	18	} catch(e) {
michael@0	19	return false;
michael@0	20	}
michael@0	21	}
michael@0	22
michael@0	23	function assertBuiltinFunction(o, name, arity) {
michael@0	24	var fn = o[name];
michael@0	25	assertDataDescriptor(Object.getOwnPropertyDescriptor(o, name), {
michael@0	26	value: fn,
michael@0	27	writable: true,
michael@0	28	enumerable: false,
michael@0	29	configurable: true,
michael@0	30	});
michael@0	31
michael@0	32	assertEq(typeof fn, "function");
michael@0	33	assertEq(Object.getPrototypeOf(fn), Function.prototype);
michael@0	34	// FIXME: Proxy should only have [[Construct]] if target has [[Construct]] (bug 929467)
michael@0	35	// assertEq(isConstructor(fn), false);
michael@0	36
michael@0	37	arraysEqual(Object.getOwnPropertyNames(fn).sort(), ["length", "name", "arguments", "caller"].sort());
michael@0	38
michael@0	39	// Also test "name", "arguments" and "caller" in addition to "length"?
michael@0	40	assertDataDescriptor(Object.getOwnPropertyDescriptor(fn, "length"), {
michael@0	41	value: arity,
michael@0	42	writable: false,
michael@0	43	enumerable: false,
michael@0	44	configurable: false,
michael@0	45	});
michael@0	46	}
michael@0	47
michael@0	48
michael@0	49	// String.prototype[@@iterator] is a built-in function
michael@0	50	assertBuiltinFunction(String.prototype, std_iterator, 0);
michael@0	51
michael@0	52	// Test StringIterator.prototype surface
michael@0	53	var iter = ""[std_iterator]();
michael@0	54	var iterProto = Object.getPrototypeOf(iter);
michael@0	55
michael@0	56	// StringIterator.prototype inherits from Object.prototype
michael@0	57	assertEq(Object.getPrototypeOf(iterProto), Object.prototype);
michael@0	58
michael@0	59	// Own properties for StringIterator.prototype: "next" and @@iterator
michael@0	60	arraysEqual(Object.getOwnPropertyNames(iterProto).sort(), ["next", std_iterator].sort());
michael@0	61
michael@0	62	// StringIterator.prototype[@@iterator] is a built-in function
michael@0	63	assertBuiltinFunction(iterProto, std_iterator, 0);
michael@0	64
michael@0	65	// StringIterator.prototype.next is a built-in function
michael@0	66	assertBuiltinFunction(iterProto, "next", 0);
michael@0	67
michael@0	68	// StringIterator.prototype[@@iterator] is generic and returns |this|
michael@0	69	for (var v of [void 0, null, true, false, "", 0, 1, {}, [], iter, iterProto]) {
michael@0	70	assertEq(iterProto[std_iterator].call(v), v);
michael@0	71	}
michael@0	72
michael@0	73	// StringIterator.prototype.next is not generic
michael@0	74	for (var v of [void 0, null, true, false, "", 0, 1, {}, [], iterProto]) {
michael@0	75	assertThrowsInstanceOf(() => iterProto.next.call(v), TypeError);
michael@0	76	}