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
|
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_RENDERER_V8_HELPERS_H_
#define EXTENSIONS_RENDERER_V8_HELPERS_H_
#include <stdint.h>
#include <string.h>
#include "base/strings/string_number_conversions.h"
#include "v8/include/v8.h"
namespace extensions {
namespace v8_helpers {
// Helper functions for V8 APIs.
// Converts |str| to a V8 string. Returns true on success.
inline bool ToV8String(v8::Isolate* isolate,
const char* str,
v8::Local<v8::String>* out) {
return v8::String::NewFromUtf8(isolate, str, v8::NewStringType::kNormal)
.ToLocal(out);
}
inline bool ToV8String(v8::Isolate* isolate,
const std::string& str,
v8::Local<v8::String>* out) {
return ToV8String(isolate, str.c_str(), out);
}
// Converts |str| to a V8 string.
// This crashes when strlen(str) > v8::String::kMaxLength.
inline v8::Local<v8::String> ToV8StringUnsafe(
v8::Isolate* isolate,
const char* str,
v8::NewStringType string_type = v8::NewStringType::kNormal) {
DCHECK(strlen(str) <= v8::String::kMaxLength);
return v8::String::NewFromUtf8(isolate, str, string_type)
.ToLocalChecked();
}
inline v8::Local<v8::String> ToV8StringUnsafe(
v8::Isolate* isolate,
const std::string& str,
v8::NewStringType string_type = v8::NewStringType::kNormal) {
return ToV8StringUnsafe(isolate, str.c_str(), string_type);
}
// Returns true if |maybe| is both a value, and that value is true.
inline bool IsTrue(v8::Maybe<bool> maybe) {
return maybe.IsJust() && maybe.FromJust();
}
// Wraps v8::Object::SetPrivate(). When possible, prefer this to SetProperty().
inline bool SetPrivateProperty(v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
v8::Local<v8::String> key,
v8::Local<v8::Value> value) {
return IsTrue(object->SetPrivate(
context, v8::Private::ForApi(context->GetIsolate(), key), value));
}
inline bool SetPrivateProperty(v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
const char* key,
v8::Local<v8::Value> value) {
v8::Local<v8::String> v8_key;
return ToV8String(context->GetIsolate(), key, &v8_key) &&
IsTrue(object->SetPrivate(
context, v8::Private::ForApi(context->GetIsolate(), v8_key),
value));
}
// GetProperty() family calls V8::Object::Get() and extracts a value from
// returned MaybeLocal. Returns true on success.
// NOTE: Think about whether you want this or GetPrivateProperty() below.
template <typename Key>
inline bool GetProperty(v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
Key key,
v8::Local<v8::Value>* out) {
return object->Get(context, key).ToLocal(out);
}
inline bool GetProperty(v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
const char* key,
v8::Local<v8::Value>* out) {
v8::Local<v8::String> v8_key;
if (!ToV8String(context->GetIsolate(), key, &v8_key))
return false;
return GetProperty(context, object, v8_key, out);
}
// Wraps v8::Object::GetPrivate(). When possible, prefer this to GetProperty().
inline bool GetPrivateProperty(v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
v8::Local<v8::String> key,
v8::Local<v8::Value>* out) {
return object
->GetPrivate(context, v8::Private::ForApi(context->GetIsolate(), key))
.ToLocal(out);
}
inline bool GetPrivateProperty(v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
const char* key,
v8::Local<v8::Value>* out) {
v8::Local<v8::String> v8_key;
return ToV8String(context->GetIsolate(), key, &v8_key) &&
GetPrivateProperty(context, object, v8_key, out);
}
// GetPropertyUnsafe() wraps v8::Object::Get(), and crashes when an exception
// is thrown.
inline v8::Local<v8::Value> GetPropertyUnsafe(
v8::Local<v8::Context> context,
v8::Local<v8::Object> object,
const char* key,
v8::NewStringType string_type = v8::NewStringType::kNormal) {
return object->Get(context,
ToV8StringUnsafe(context->GetIsolate(), key, string_type))
.ToLocalChecked();
}
} // namespace v8_helpers
} // namespace extensions
#endif // EXTENSIONS_RENDERER_V8_HELPERS_H_
|
