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
|
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/BoundFunction.h>
#include <LibJS/Runtime/Function.h>
#include <LibJS/Runtime/GlobalObject.h>
namespace JS {
Function::Function(Object& prototype)
: Function(prototype, {}, {})
{
}
Function::Function(Object& prototype, Value bound_this, Vector<Value> bound_arguments)
: Object(&prototype)
, m_bound_this(bound_this)
, m_bound_arguments(move(bound_arguments))
{
}
Function::~Function()
{
}
BoundFunction* Function::bind(Value bound_this_value, Vector<Value> arguments)
{
Function& target_function = is_bound_function() ? static_cast<BoundFunction&>(*this).target_function() : *this;
auto bound_this_object = [bound_this_value, this]() -> Value {
if (!m_bound_this.is_empty())
return m_bound_this;
switch (bound_this_value.type()) {
case Value::Type::Undefined:
case Value::Type::Null:
if (interpreter().in_strict_mode())
return bound_this_value;
return &global_object();
default:
return bound_this_value.to_object(interpreter(), global_object());
}
}();
i32 computed_length = 0;
auto length_property = get("length");
if (interpreter().exception())
return nullptr;
if (length_property.is_number())
computed_length = max(0, length_property.as_i32() - static_cast<i32>(arguments.size()));
Object* constructor_prototype = nullptr;
auto prototype_property = target_function.get("prototype");
if (interpreter().exception())
return nullptr;
if (prototype_property.is_object())
constructor_prototype = &prototype_property.as_object();
auto all_bound_arguments = bound_arguments();
all_bound_arguments.append(move(arguments));
return interpreter().heap().allocate<BoundFunction>(global_object(), target_function, bound_this_object, move(all_bound_arguments), computed_length, constructor_prototype);
}
void Function::visit_children(Visitor& visitor)
{
Object::visit_children(visitor);
visitor.visit(m_bound_this);
for (auto argument : m_bound_arguments)
visitor.visit(argument);
}
}
|
