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Issue 1163853002: Revert of [es6] implement default parameters via desugaring (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 5 years, 6 months ago
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1 // Copyright 2015 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 // Flags: --harmony-default-parameters --harmony-arrow-functions
6
7 function return_specified() { return "specified"; }
8
9 var method_returns_specified = {
10 method() { return "specified"; }
11 };
12
13
14 (function testDefaultFunctions() {
15 function optional_function(handler = function() { }) {
16 assertEquals("function", typeof handler);
17
18 // TODO(caitp): infer function name correctly
19 // (https://code.google.com/p/v8/issues/detail?id=3699)
20 // assertEquals("handler", handler.name);
21
22 return handler();
23 }
24 assertEquals(undefined, optional_function());
25 assertEquals(undefined, optional_function(undefined));
26 assertEquals("specified", optional_function(return_specified));
27 })();
28
29
30 (function testDefaultFunctionReferencesParameters() {
31 function fn1(handler = function() { return value; }, value) {
32 return handler();
33 }
34 assertEquals(undefined, fn1());
35 assertEquals(undefined, fn1(undefined, undefined));
36 assertEquals(1, fn1(undefined, 1));
37
38 function fn2(value, handler = function() { return value; }) {
39 return handler();
40 }
41 assertEquals(undefined, fn2());
42 assertEquals(undefined, fn2(undefined));
43 assertEquals(1, fn2(1));
44 })();
45
46
47 (function testDefaultObjects() {
48 function optional_object(object = { method() { return "method"; } }) {
49 assertEquals("object", typeof object);
50
51 assertEquals("function", typeof object.method);
52 return object.method();
53 }
54
55 assertEquals("method", optional_object());
56 assertEquals("method", optional_object(undefined));
57 assertEquals("specified", optional_object(method_returns_specified));
58
59
60 assertEquals(4, (function(x = { a: 4 }) { return x.a; })());
61 assertEquals(5, (function(x, y = { a: x }) { return y.a; })(5));
62 assertEquals(6, (function(x, y = { a: eval("x") }) { return y.a; })(6));
63 })();
64
65
66 // TDZ
67
68 (function testReferencesUninitializedParameter() {
69 assertThrows(function(a = b, b) {}, ReferenceError);
70 })();
71
72
73 (function testEvalReferencesUninitializedParameter() {
74 assertThrows( function(x = { a: y }, y) { return x.a; }, ReferenceError);
75 assertThrows(function(a = eval("b"), b = 0) { return a; }, ReferenceError);
76 assertThrows(
77 function(x = { a: eval("y") }, y) { return x.a; }, ReferenceError);
78 })();
79
80
81 (function testReferencesInitializedParameter() {
82 assertEquals(1, (function(a = 1, b = a) { return b; })());
83 })();
84
85
86 // Scoping
87 //
88 // TODO(caitp): fix scoping --- var declarations in function body can't be
89 // resolved in formal parameters
90 // assertThrows(function referencesVariableBodyDeclaration(a = body_var) {
91 // var body_var = true;
92 // return a;
93 // }, ReferenceError);
94
95
96 // TODO(caitp): default function length does not include any parameters
97 // following the first optional parameter
98 // assertEquals(0, (function(a = 1) {}).length);
99 // assertEquals(1, (function(a, b = 1) {}).length);
100 // assertEquals(2, (function(a, b, c = 1) {}).length);
101 // assertEquals(3, (function(a, b, c, d = 1) {}).length);
102 // assertEquals(1, (function(a, b = 1, c, d = 1) {}).length);
103
104
105 (function testInitializerReferencesThis() {
106 var O = {};
107 function fn(x = this) { return x; }
108 assertEquals(O, fn.call(O));
109
110 function fn2(x = () => this) { return x(); }
111 assertEquals(O, fn2.call(O));
112 })();
113
114
115 (function testInitializerReferencesSelf() {
116 function fn(x, y = fn) { return x ? y(false) + 1 : 0 }
117 assertEquals(1, fn(true));
118 })();
119
120
121 (function testInitializerEvalParameter() {
122 assertEquals(7, (function(x, y = eval("x")) { return y; })(7));
123 assertEquals(9, (function(x = () => eval("y"), y = 9) { return x(); })());
124 })();
125
126
127 (function testContextAllocatedUsedInBody() {
128 assertEquals("Monkey!Monkey!Monkey!", (function(x, y = eval("x")) {
129 return "Mon" + x + "Mon" + eval("y") + "Mon" + y;
130 })("key!"));
131 assertEquals("Monkey!", (function(x = "Mon", y = "key!") {
132 return eval("x") + eval("y");
133 })());
134 })();
135
136
137 (function testContextAllocatedEscapesFunction() {
138 assertEquals("Monkey!", (function(x = "Monkey!") {
139 return function() {
140 return x;
141 };
142 })()());
143 })();
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