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
|
// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GIN_OBJECT_TEMPLATE_BUILDER_H_
#define GIN_OBJECT_TEMPLATE_BUILDER_H_
#include <string_view>
#include <type_traits>
#include <utility>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "gin/converter.h"
#include "gin/function_template.h"
#include "gin/gin_export.h"
#include "v8/include/v8-forward.h"
namespace gin {
namespace internal {
template <typename T>
v8::Local<v8::FunctionTemplate> CreateFunctionTemplate(v8::Isolate* isolate,
T callback,
const char* type_name) {
// We need to handle member function pointers case specially because the first
// parameter for callbacks to MFP should typically come from the the
// JavaScript "this" object the function was called on, not from the first
// normal parameter.
InvokerOptions options;
if (std::is_member_function_pointer<T>::value) {
options.holder_is_first_argument = true;
options.holder_type = type_name;
}
return ::gin::CreateFunctionTemplate(
isolate, base::BindRepeating(std::move(callback)), std::move(options));
}
} // namespace internal
// ObjectTemplateBuilder provides a handy interface to creating
// v8::ObjectTemplate instances with various sorts of properties.
class GIN_EXPORT ObjectTemplateBuilder {
public:
explicit ObjectTemplateBuilder(v8::Isolate* isolate);
ObjectTemplateBuilder(v8::Isolate* isolate, const char* type_name);
ObjectTemplateBuilder(const ObjectTemplateBuilder& other);
~ObjectTemplateBuilder();
// It's against Google C++ style to return a non-const ref, but we take some
// poetic license here in order that all calls to Set() can be via the '.'
// operator and line up nicely.
template <typename T>
ObjectTemplateBuilder& SetValue(const std::string_view& name, T val) {
return SetImpl(name, ConvertToV8(isolate_, val));
}
// In the following methods, T and U can be function pointer, member function
// pointer, base::RepeatingCallback, or v8::FunctionTemplate. Most clients
// will want to use one of the first two options. Also see
// gin::CreateFunctionTemplate() for creating raw function templates.
template <typename T>
ObjectTemplateBuilder& SetMethod(const std::string_view& name,
const T& callback) {
return SetImpl(
name, internal::CreateFunctionTemplate(isolate_, callback, type_name_));
}
template <typename T>
ObjectTemplateBuilder& SetMethod(v8::Local<v8::Name> name,
const T& callback) {
return SetImpl(
name, internal::CreateFunctionTemplate(isolate_, callback, type_name_));
}
template <typename T>
ObjectTemplateBuilder& SetProperty(const std::string_view& name,
const T& getter) {
return SetPropertyImpl(
name, internal::CreateFunctionTemplate(isolate_, getter, type_name_),
v8::Local<v8::FunctionTemplate>());
}
template <typename T, typename U>
ObjectTemplateBuilder& SetProperty(const std::string_view& name,
const T& getter,
const U& setter) {
return SetPropertyImpl(
name, internal::CreateFunctionTemplate(isolate_, getter, type_name_),
internal::CreateFunctionTemplate(isolate_, setter, type_name_));
}
// Whereas SetProperty creates an accessor property, this creates what appears
// to be a data property but whose value is lazily computed the first time the
// [[Get]] operation occurs.
template <typename T>
ObjectTemplateBuilder& SetLazyDataProperty(const std::string_view& name,
const T& getter) {
InvokerOptions options;
if (std::is_member_function_pointer<T>::value) {
options.holder_is_first_argument = true;
options.holder_type = type_name_;
}
auto [callback, data] = CreateDataPropertyCallback(
isolate_, base::BindRepeating(getter), std::move(options));
return SetLazyDataPropertyImpl(name, callback, data);
}
ObjectTemplateBuilder& AddNamedPropertyInterceptor();
ObjectTemplateBuilder& AddIndexedPropertyInterceptor();
v8::Local<v8::ObjectTemplate> Build();
private:
ObjectTemplateBuilder& SetImpl(const std::string_view& name,
v8::Local<v8::Data> val);
ObjectTemplateBuilder& SetImpl(v8::Local<v8::Name> name,
v8::Local<v8::Data> val);
ObjectTemplateBuilder& SetPropertyImpl(
const std::string_view& name,
v8::Local<v8::FunctionTemplate> getter,
v8::Local<v8::FunctionTemplate> setter);
ObjectTemplateBuilder& SetLazyDataPropertyImpl(
const std::string_view& name,
v8::AccessorNameGetterCallback callback,
v8::Local<v8::Value> data);
raw_ptr<v8::Isolate> isolate_;
// If provided, |type_name_| will be used to give a user-friendly error
// message if a member function is invoked on the wrong type of object.
const char* type_name_ = nullptr;
// ObjectTemplateBuilder should only be used on the stack.
v8::Local<v8::FunctionTemplate> constructor_template_;
v8::Local<v8::ObjectTemplate> template_;
};
} // namespace gin
#endif // GIN_OBJECT_TEMPLATE_BUILDER_H_
|
