blob: 87d35db4bc62e0f01618ea70f316b7d6d9d21a46 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
// Copyright 2019 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-nullish
// Basic sanity checks.
assertTrue(true ?? false);
assertFalse(false ?? true);
assertTrue(undefined ?? true);
assertTrue(null ?? true);
assertEquals([], [] ?? true);
// Chaining nullish.
assertTrue(null ?? null ?? true);
assertTrue(null ?? null ?? true ?? null);
assertTrue(undefined ?? undefined ?? true);
assertTrue(undefined ?? undefined ?? true ?? undefined);
assertFalse(null ?? false ?? null);
assertFalse(undefined ?? false ?? undefined);
// Nullish and conditionals.
assertTrue(null ?? true ? true : false);
assertTrue(null ?? null ?? true ? true : false);
assertTrue(undefined ?? true ? true : false);
assertTrue(undefined ?? undefined ?? true ? true : false);
// Nullish mixed expressions.
assertTrue(null ?? 1 == 1);
assertTrue(undefined ?? 1 == 1);
assertTrue(null ?? null ?? 1 == 1);
assertTrue(undefined ??undefined ?? 1 == 1);
assertEquals(1, null ?? 1 | 0);
assertEquals(1, undefined ?? 1 | 0);
assertEquals(1, null ?? null ?? 1 | 0);
assertEquals(1, undefined ?? undefined ?? 1 | 0);
// Short circuit.
{
let ran = false;
let never_ran = () => { ran = true; }
let value = true ?? never_ran();
assertTrue(value);
assertFalse(ran);
}
{
let ran = false;
let never_ran = () => { ran = true; }
let value = undefined ?? true ?? never_ran();
assertTrue(value);
assertFalse(ran);
}
{
let ran = false;
let never_ran = () => { ran = true; }
let value = null ?? true ?? never_ran();
assertTrue(value);
assertFalse(ran);
}
// Nullish in tests evaluates only once.
{
let run_count = 0;
let run = () => { run_count++; return null; }
if (run() ?? true) {} else { assertUnreachable(); }
assertEquals(1, run_count);
}
// Nullish may not contain or be contained within || or &&.
assertThrows("true || true ?? true", SyntaxError);
assertThrows("true ?? true || true", SyntaxError);
assertThrows("true && true ?? true", SyntaxError);
assertThrows("true ?? true && true", SyntaxError);
// Test boolean expressions and nullish.
assertTrue((false || true) ?? false);
assertTrue(null ?? (false || true));
assertTrue((false || null) ?? true);
assertTrue((false || null) ?? (true && null) ?? true);
assertTrue((false || undefined) ?? true);
assertTrue((false || undefined) ?? (true && undefined) ?? true);
assertTrue(null ?? (false || true));
assertTrue(undefined ?? (false || true));
assertTrue(null ?? (false || null) ?? true);
assertTrue(undefined ?? (false || undefined) ?? true);
assertTrue(null ?? null ?? (false || true));
assertTrue(undefined ?? undefined ?? (false || true));
assertTrue((undefined ?? false) || true);
assertTrue((null ?? false) || true);
assertTrue((undefined ?? undefined ?? false) || false || true);
assertTrue((null ?? null ?? false) || false || true);
assertTrue(false || (undefined ?? true));
assertTrue(false || (null ?? true));
assertTrue(false || false || (undefined ?? undefined ?? true));
assertTrue(false || false || (null ?? null ?? true));
// Test use when test true.
if (undefined ?? true) {} else { assertUnreachable(); }
if (null ?? true) {} else { assertUnreachable(); }
if (undefined ?? undefined ?? true) {} else { assertUnreachable(); }
if (null ?? null ?? true) {} else { assertUnreachable(); }
// test use when test false
if (undefined ?? false) { assertUnreachable(); } else {}
if (null ?? false) { assertUnreachable(); } else {}
if (undefined ?? undefined ?? false) { assertUnreachable(); } else {}
if (null ?? null ?? false) { assertUnreachable(); } else {}
if (undefined ?? false ?? true) { assertUnreachable(); } else {}
if (null ?? false ?? true) { assertUnreachable(); } else {}
// Test use with nested boolean.
if ((false || undefined) ?? true) {} else { assertUnreachable(); }
if ((false || null) ?? true) {} else { assertUnreachable(); }
if ((false || undefined) ?? undefined ?? true) {} else { assertUnreachable(); }
if ((false || null) ?? null ?? true) {} else { assertUnreachable(); }
if (undefined ?? (false || true)) {} else { assertUnreachable(); }
if (null ?? (false || true)) {} else { assertUnreachable(); }
if (undefined ?? undefined ?? (false || true)) {} else { assertUnreachable(); }
if (null ?? null ?? (false || true)) {} else { assertUnreachable(); }
if (undefined ?? (false || undefined) ?? true) {} else { assertUnreachable(); }
if (null ?? (false || null) ?? true) {} else { assertUnreachable(); }
// Nested nullish.
if ((null ?? true) || false) {} else { assertUnreachable(); }
if ((null ?? null ?? true) || false) {} else { assertUnreachable(); }
if (false || (null ?? true)) {} else { assertUnreachable(); }
if (false || (null ?? null ?? true)) {} else { assertUnreachable(); }
if ((null ?? false) || false) { assertUnreachable(); } else {}
if ((null ?? null ?? false) || false) { assertUnreachable(); } else {}
if (false || (null ?? false)) { assertUnreachable(); } else {}
if (false || (null ?? null ?? false)) { assertUnreachable(); } else {}
|
