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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.
// Flags: --harmony-rest-parameters
(function testRestIndex() {
assertEquals(5, (function(...args) { return args.length; })(1,2,3,4,5));
assertEquals(4, (function(a, ...args) { return args.length; })(1,2,3,4,5));
assertEquals(3, (function(a, b, ...args) { return args.length; })(1,2,3,4,5));
assertEquals(2, (function(a, b, c, ...args) {
return args.length; })(1,2,3,4,5));
assertEquals(1, (function(a, b, c, d, ...args) {
return args.length; })(1,2,3,4,5));
assertEquals(0, (function(a, b, c, d, e, ...args) {
return args.length; })(1,2,3,4,5));
})();
function strictTest(a, b, ...c) {
"use strict";
assertEquals(Array, c.constructor);
assertTrue(Array.isArray(c));
var expectedLength = arguments.length >= 3 ? arguments.length - 2 : 0;
assertEquals(expectedLength, c.length);
for (var i = 2, j = 0; i < arguments.length; ++i) {
assertEquals(c[j++], arguments[i]);
}
}
function sloppyTest(a, b, ...c) {
assertEquals(Array, c.constructor);
assertTrue(Array.isArray(c));
var expectedLength = arguments.length >= 3 ? arguments.length - 2 : 0;
assertEquals(expectedLength, c.length);
for (var i = 2, j = 0; i < arguments.length; ++i) {
assertEquals(c[j++], arguments[i]);
}
}
var O = {
strict: strictTest,
sloppy: sloppyTest
};
(function testStrictRestParamArity() {
assertEquals(2, strictTest.length);
assertEquals(2, O.strict.length);
})();
(function testRestParamsStrictMode() {
strictTest();
strictTest(1, 2);
strictTest(1, 2, 3, 4, 5, 6);
strictTest(1, 2, 3);
O.strict();
O.strict(1, 2);
O.strict(1, 2, 3, 4, 5, 6);
O.strict(1, 2, 3);
})();
(function testRestParamsStrictModeApply() {
strictTest.apply(null, []);
strictTest.apply(null, [1, 2]);
strictTest.apply(null, [1, 2, 3, 4, 5, 6]);
strictTest.apply(null, [1, 2, 3]);
O.strict.apply(O, []);
O.strict.apply(O, [1, 2]);
O.strict.apply(O, [1, 2, 3, 4, 5, 6]);
O.strict.apply(O, [1, 2, 3]);
})();
(function testRestParamsStrictModeCall() {
strictTest.call(null);
strictTest.call(null, 1, 2);
strictTest.call(null, 1, 2, 3, 4, 5, 6);
strictTest.call(null, 1, 2, 3);
O.strict.call(O);
O.strict.call(O, 1, 2);
O.strict.call(O, 1, 2, 3, 4, 5, 6);
O.strict.call(O, 1, 2, 3);
})();
(function testsloppyRestParamArity() {
assertEquals(2, sloppyTest.length);
assertEquals(2, O.sloppy.length);
})();
(function testRestParamssloppyMode() {
sloppyTest();
sloppyTest(1, 2);
sloppyTest(1, 2, 3, 4, 5, 6);
sloppyTest(1, 2, 3);
O.sloppy();
O.sloppy(1, 2);
O.sloppy(1, 2, 3, 4, 5, 6);
O.sloppy(1, 2, 3);
})();
(function testRestParamssloppyModeApply() {
sloppyTest.apply(null, []);
sloppyTest.apply(null, [1, 2]);
sloppyTest.apply(null, [1, 2, 3, 4, 5, 6]);
sloppyTest.apply(null, [1, 2, 3]);
O.sloppy.apply(O, []);
O.sloppy.apply(O, [1, 2]);
O.sloppy.apply(O, [1, 2, 3, 4, 5, 6]);
O.sloppy.apply(O, [1, 2, 3]);
})();
(function testRestParamssloppyModeCall() {
sloppyTest.call(null);
sloppyTest.call(null, 1, 2);
sloppyTest.call(null, 1, 2, 3, 4, 5, 6);
sloppyTest.call(null, 1, 2, 3);
O.sloppy.call(O);
O.sloppy.call(O, 1, 2);
O.sloppy.call(O, 1, 2, 3, 4, 5, 6);
O.sloppy.call(O, 1, 2, 3);
})();
(function testUnmappedArguments() {
// Strict/Unmapped arguments should always be used for functions with rest
// parameters
assertThrows(function(...rest) { return arguments.caller; }, TypeError);
assertThrows(function(...rest) { return arguments.callee; }, TypeError);
// TODO(caitp): figure out why this doesn't throw sometimes, even though the
// getter always does =)
// assertThrows(function(...rest) { arguments.caller = 1; }, TypeError);
// assertThrows(function(...rest) { arguments.callee = 1; }, TypeError);
})();
(function testNoAliasArgumentsStrict() {
function strictF(a, ...rest) {
"use strict";
arguments[0] = 1;
assertEquals(3, a);
arguments[1] = 2;
assertArrayEquals([4, 5], rest);
}
strictF(3, 4, 5);
})();
(function testNoAliasArgumentsSloppy() {
function sloppyF(a, ...rest) {
arguments[0] = 1;
assertEquals(3, a);
arguments[1] = 2;
assertArrayEquals([4, 5], rest);
}
sloppyF(3, 4, 5);
})();
/* TODO(caitp): support arrow functions (blocked on spread operator support)
(function testRestParamsArrowFunctions() {
"use strict";
var fn = (a, b, ...c) => c;
assertEquals([], fn());
assertEquals([], fn(1, 2));
assertEquals([3], fn(1, 2, 3));
assertEquals([3, 4], fn(1, 2, 3, 4));
assertEquals([3, 4, 5], fn(1, 2, 3, 4, 5));
assertThrows("var x = ...y => y;", SyntaxError);
assertEquals([], ((...args) => args)());
assertEquals([1,2,3], ((...args) => args)(1,2,3));
})();*/
(function testRestParamsWithNewTarget() {
"use strict";
class Base {
constructor(...a) {
this.base = a;
assertEquals(arguments.length, a.length);
var args = [];
for (var i = 0; i < arguments.length; ++i) {
args.push(arguments[i]);
}
assertEquals(args, a);
}
}
class Child extends Base {
constructor(...b) {
super(1, 2, 3);
this.child = b;
assertEquals(arguments.length, b.length);
var args = [];
for (var i = 0; i < arguments.length; ++i) {
args.push(arguments[i]);
}
assertEquals(args, b);
}
}
var c = new Child(1, 2, 3);
assertEquals([1, 2, 3], c.child);
assertEquals([1, 2, 3], c.base);
})();
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