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
|
// Copyright 2015 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.
// Tests the interaction of Function.prototype.bind with proxies.
// (Helper)
var log = [];
var logger = {};
var handler = new Proxy({}, logger);
logger.get = function(t, trap, r) {
return function() {
log.push([trap, ...arguments]);
return Reflect[trap](...arguments);
}
};
// Simple case
var target = function(a, b, c) { "use strict"; return this };
var proxy = new Proxy(target, handler);
var this_value = Symbol();
log.length = 0;
result = Function.prototype.bind.call(proxy, this_value, "foo");
assertEquals(2, result.length);
assertEquals(target.__proto__, result.__proto__);
assertEquals(this_value, result());
assertEquals(5, log.length);
for (var i in log) assertSame(target, log[i][1]);
assertEquals(["getPrototypeOf", target], log[0]);
assertEquals(["getOwnPropertyDescriptor", target, "length"], log[1]);
assertEquals(["get", target, "length", proxy], log[2]);
assertEquals(["get", target, "name", proxy], log[3]);
assertEquals(["apply", target, this_value, ["foo"]], log[4]);
assertEquals(new target(), new result());
// Custom prototype
log.length = 0;
target.__proto__ = {radio: "gaga"};
result = Function.prototype.bind.call(proxy, this_value, "foo");
assertEquals(2, result.length);
assertSame(target.__proto__, result.__proto__);
assertEquals(this_value, result());
assertEquals(5, log.length);
for (var i in log) assertSame(target, log[i][1]);
assertEquals(["getPrototypeOf", target], log[0]);
assertEquals(["getOwnPropertyDescriptor", target, "length"], log[1]);
assertEquals(["get", target, "length", proxy], log[2]);
assertEquals(["get", target, "name", proxy], log[3]);
assertEquals(["apply", target, this_value, ["foo"]], log[4]);
// Custom length
handler = {
get() {return 42},
getOwnPropertyDescriptor() {return {configurable: true}}
};
proxy = new Proxy(target, handler);
result = Function.prototype.bind.call(proxy, this_value, "foo");
assertEquals(41, result.length);
assertEquals(this_value, result());
// Long length
handler = {
get() {return Math.pow(2, 100)},
getOwnPropertyDescriptor() {return {configurable: true}}
};
proxy = new Proxy(target, handler);
result = Function.prototype.bind.call(proxy, this_value, "foo");
assertEquals(Math.pow(2, 100) - 1, result.length);
assertEquals(this_value, result());
// Very long length
handler = {
get() {return 1/0},
getOwnPropertyDescriptor() {return {configurable: true}}
};
proxy = new Proxy(target, handler);
result = Function.prototype.bind.call(proxy, this_value, "foo");
assertEquals(1/0, result.length);
assertEquals(this_value, result());
// Non-integer length
handler = {
get() {return 4.2},
getOwnPropertyDescriptor() {return {configurable: true}}
};
proxy = new Proxy(target, handler);
result = Function.prototype.bind.call(proxy, this_value, "foo");
assertEquals(3, result.length);
assertEquals(this_value, result());
// Undefined length
handler = {
get() {},
getOwnPropertyDescriptor() {return {configurable: true}}
};
proxy = new Proxy(target, handler);
result = Function.prototype.bind.call(proxy, this_value, "foo");
assertEquals(0, result.length);
assertEquals(this_value, result());
// Non-callable
assertThrows(() => Function.prototype.bind.call(new Proxy({}, {})), TypeError);
assertThrows(() => Function.prototype.bind.call(new Proxy([], {})), TypeError);
// Non-constructable
result = Function.prototype.bind.call(() => 42, this_value, "foo");
assertEquals(42, result());
assertThrows(() => new result());
|