1 #include "myobject.h"
2 #include "../common.h"
3
4 napi_ref MyObject::constructor;
5
MyObject(double value)6 MyObject::MyObject(double value)
7 : value_(value), env_(nullptr), wrapper_(nullptr) {}
8
~MyObject()9 MyObject::~MyObject() { napi_delete_reference(env_, wrapper_); }
10
Destructor(napi_env env,void * nativeObject,void *)11 void MyObject::Destructor(
12 napi_env env, void* nativeObject, void* /*finalize_hint*/) {
13 MyObject* obj = static_cast<MyObject*>(nativeObject);
14 delete obj;
15 }
16
Init(napi_env env,napi_value exports)17 void MyObject::Init(napi_env env, napi_value exports) {
18 napi_property_descriptor properties[] = {
19 { "value", nullptr, nullptr, GetValue, SetValue, 0, napi_default, 0 },
20 { "valueReadonly", nullptr, nullptr, GetValue, nullptr, 0, napi_default,
21 0 },
22 DECLARE_NAPI_PROPERTY("plusOne", PlusOne),
23 DECLARE_NAPI_PROPERTY("multiply", Multiply),
24 };
25
26 napi_value cons;
27 NAPI_CALL_RETURN_VOID(env, napi_define_class(
28 env, "MyObject", -1, New, nullptr,
29 sizeof(properties) / sizeof(napi_property_descriptor),
30 properties, &cons));
31
32 NAPI_CALL_RETURN_VOID(env, napi_create_reference(env, cons, 1, &constructor));
33
34 NAPI_CALL_RETURN_VOID(env,
35 napi_set_named_property(env, exports, "MyObject", cons));
36 }
37
New(napi_env env,napi_callback_info info)38 napi_value MyObject::New(napi_env env, napi_callback_info info) {
39 napi_value new_target;
40 NAPI_CALL(env, napi_get_new_target(env, info, &new_target));
41 bool is_constructor = (new_target != nullptr);
42
43 size_t argc = 1;
44 napi_value args[1];
45 napi_value _this;
46 NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, &_this, nullptr));
47
48 if (is_constructor) {
49 // Invoked as constructor: `new MyObject(...)`
50 double value = 0;
51
52 napi_valuetype valuetype;
53 NAPI_CALL(env, napi_typeof(env, args[0], &valuetype));
54
55 if (valuetype != napi_undefined) {
56 NAPI_CALL(env, napi_get_value_double(env, args[0], &value));
57 }
58
59 MyObject* obj = new MyObject(value);
60
61 obj->env_ = env;
62 NAPI_CALL(env, napi_wrap(env,
63 _this,
64 obj,
65 MyObject::Destructor,
66 nullptr, // finalize_hint
67 &obj->wrapper_));
68
69 return _this;
70 }
71
72 // Invoked as plain function `MyObject(...)`, turn into construct call.
73 argc = 1;
74 napi_value argv[1] = {args[0]};
75
76 napi_value cons;
77 NAPI_CALL(env, napi_get_reference_value(env, constructor, &cons));
78
79 napi_value instance;
80 NAPI_CALL(env, napi_new_instance(env, cons, argc, argv, &instance));
81
82 return instance;
83 }
84
GetValue(napi_env env,napi_callback_info info)85 napi_value MyObject::GetValue(napi_env env, napi_callback_info info) {
86 napi_value _this;
87 NAPI_CALL(env,
88 napi_get_cb_info(env, info, nullptr, nullptr, &_this, nullptr));
89
90 MyObject* obj;
91 NAPI_CALL(env, napi_unwrap(env, _this, reinterpret_cast<void**>(&obj)));
92
93 napi_value num;
94 NAPI_CALL(env, napi_create_double(env, obj->value_, &num));
95
96 return num;
97 }
98
SetValue(napi_env env,napi_callback_info info)99 napi_value MyObject::SetValue(napi_env env, napi_callback_info info) {
100 size_t argc = 1;
101 napi_value args[1];
102 napi_value _this;
103 NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, &_this, nullptr));
104
105 MyObject* obj;
106 NAPI_CALL(env, napi_unwrap(env, _this, reinterpret_cast<void**>(&obj)));
107
108 NAPI_CALL(env, napi_get_value_double(env, args[0], &obj->value_));
109
110 return nullptr;
111 }
112
PlusOne(napi_env env,napi_callback_info info)113 napi_value MyObject::PlusOne(napi_env env, napi_callback_info info) {
114 napi_value _this;
115 NAPI_CALL(env,
116 napi_get_cb_info(env, info, nullptr, nullptr, &_this, nullptr));
117
118 MyObject* obj;
119 NAPI_CALL(env, napi_unwrap(env, _this, reinterpret_cast<void**>(&obj)));
120
121 obj->value_ += 1;
122
123 napi_value num;
124 NAPI_CALL(env, napi_create_double(env, obj->value_, &num));
125
126 return num;
127 }
128
Multiply(napi_env env,napi_callback_info info)129 napi_value MyObject::Multiply(napi_env env, napi_callback_info info) {
130 size_t argc = 1;
131 napi_value args[1];
132 napi_value _this;
133 NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, &_this, nullptr));
134
135 double multiple = 1;
136 if (argc >= 1) {
137 NAPI_CALL(env, napi_get_value_double(env, args[0], &multiple));
138 }
139
140 MyObject* obj;
141 NAPI_CALL(env, napi_unwrap(env, _this, reinterpret_cast<void**>(&obj)));
142
143 napi_value cons;
144 NAPI_CALL(env, napi_get_reference_value(env, constructor, &cons));
145
146 const int kArgCount = 1;
147 napi_value argv[kArgCount];
148 NAPI_CALL(env, napi_create_double(env, obj->value_ * multiple, argv));
149
150 napi_value instance;
151 NAPI_CALL(env, napi_new_instance(env, cons, kArgCount, argv, &instance));
152
153 return instance;
154 }
155
156 EXTERN_C_START
Init(napi_env env,napi_value exports)157 napi_value Init(napi_env env, napi_value exports) {
158 MyObject::Init(env, exports);
159 return exports;
160 }
161 EXTERN_C_END
162