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1/*********************************************************************
2 * NAN - Native Abstractions for Node.js
3 *
4 * Copyright (c) 2018 NAN contributors
5 *
6 * MIT License <https://github.com/nodejs/nan/blob/master/LICENSE.md>
7 ********************************************************************/
8
9#ifndef NAN_JSON_H_
10#define NAN_JSON_H_
11
12#if NODE_MODULE_VERSION < NODE_0_12_MODULE_VERSION
13#define NAN_JSON_H_NEED_PARSE 1
14#else
15#define NAN_JSON_H_NEED_PARSE 0
16#endif // NODE_MODULE_VERSION < NODE_0_12_MODULE_VERSION
17
18#if NODE_MODULE_VERSION >= NODE_7_0_MODULE_VERSION
19#define NAN_JSON_H_NEED_STRINGIFY 0
20#else
21#define NAN_JSON_H_NEED_STRINGIFY 1
22#endif // NODE_MODULE_VERSION >= NODE_7_0_MODULE_VERSION
23
24class JSON {
25 public:
26 JSON() {
27#if NAN_JSON_H_NEED_PARSE + NAN_JSON_H_NEED_STRINGIFY
28 Nan::HandleScope scope;
29
30 Nan::MaybeLocal<v8::Value> maybe_global_json = Nan::Get(
31 Nan::GetCurrentContext()->Global(),
32 Nan::New("JSON").ToLocalChecked()
33 );
34
35 assert(!maybe_global_json.IsEmpty() && "global JSON is empty");
36 v8::Local<v8::Value> val_global_json = maybe_global_json.ToLocalChecked();
37
38 assert(val_global_json->IsObject() && "global JSON is not an object");
39 Nan::MaybeLocal<v8::Object> maybe_obj_global_json =
40 Nan::To<v8::Object>(val_global_json);
41
42 assert(!maybe_obj_global_json.IsEmpty() && "global JSON object is empty");
43 v8::Local<v8::Object> global_json = maybe_obj_global_json.ToLocalChecked();
44
45#if NAN_JSON_H_NEED_PARSE
46 Nan::MaybeLocal<v8::Value> maybe_parse_method = Nan::Get(
47 global_json, Nan::New("parse").ToLocalChecked()
48 );
49
50 assert(!maybe_parse_method.IsEmpty() && "JSON.parse is empty");
51 v8::Local<v8::Value> parse_method = maybe_parse_method.ToLocalChecked();
52
53 assert(parse_method->IsFunction() && "JSON.parse is not a function");
54 parse_cb_.Reset(parse_method.As<v8::Function>());
55#endif // NAN_JSON_H_NEED_PARSE
56
57#if NAN_JSON_H_NEED_STRINGIFY
58 Nan::MaybeLocal<v8::Value> maybe_stringify_method = Nan::Get(
59 global_json, Nan::New("stringify").ToLocalChecked()
60 );
61
62 assert(!maybe_stringify_method.IsEmpty() && "JSON.stringify is empty");
63 v8::Local<v8::Value> stringify_method =
64 maybe_stringify_method.ToLocalChecked();
65
66 assert(
67 stringify_method->IsFunction() && "JSON.stringify is not a function"
68 );
69 stringify_cb_.Reset(stringify_method.As<v8::Function>());
70#endif // NAN_JSON_H_NEED_STRINGIFY
71#endif // NAN_JSON_H_NEED_PARSE + NAN_JSON_H_NEED_STRINGIFY
72 }
73
74 inline
75 Nan::MaybeLocal<v8::Value> Parse(v8::Local<v8::String> json_string) {
76 Nan::EscapableHandleScope scope;
77#if NAN_JSON_H_NEED_PARSE
78 return scope.Escape(parse(json_string));
79#else
80 Nan::MaybeLocal<v8::Value> result;
81#if NODE_MODULE_VERSION >= NODE_0_12_MODULE_VERSION && \
82 NODE_MODULE_VERSION <= IOJS_2_0_MODULE_VERSION
83 result = v8::JSON::Parse(json_string);
84#else
85#if NODE_MODULE_VERSION > NODE_6_0_MODULE_VERSION
86 v8::Local<v8::Context> context_or_isolate = Nan::GetCurrentContext();
87#else
88 v8::Isolate* context_or_isolate = v8::Isolate::GetCurrent();
89#endif // NODE_MODULE_VERSION > NODE_6_0_MODULE_VERSION
90 result = v8::JSON::Parse(context_or_isolate, json_string);
91#endif // NODE_MODULE_VERSION >= NODE_0_12_MODULE_VERSION &&
92 // NODE_MODULE_VERSION <= IOJS_2_0_MODULE_VERSION
93 if (result.IsEmpty()) return v8::Local<v8::Value>();
94 return scope.Escape(result.ToLocalChecked());
95#endif // NAN_JSON_H_NEED_PARSE
96 }
97
98 inline
99 Nan::MaybeLocal<v8::String> Stringify(v8::Local<v8::Object> json_object) {
100 Nan::EscapableHandleScope scope;
101 Nan::MaybeLocal<v8::String> result =
102#if NAN_JSON_H_NEED_STRINGIFY
103 Nan::To<v8::String>(stringify(json_object));
104#else
105 v8::JSON::Stringify(Nan::GetCurrentContext(), json_object);
106#endif // NAN_JSON_H_NEED_STRINGIFY
107 if (result.IsEmpty()) return v8::Local<v8::String>();
108 return scope.Escape(result.ToLocalChecked());
109 }
110
111 inline
112 Nan::MaybeLocal<v8::String> Stringify(v8::Local<v8::Object> json_object,
113 v8::Local<v8::String> gap) {
114 Nan::EscapableHandleScope scope;
115 Nan::MaybeLocal<v8::String> result =
116#if NAN_JSON_H_NEED_STRINGIFY
117 Nan::To<v8::String>(stringify(json_object, gap));
118#else
119 v8::JSON::Stringify(Nan::GetCurrentContext(), json_object, gap);
120#endif // NAN_JSON_H_NEED_STRINGIFY
121 if (result.IsEmpty()) return v8::Local<v8::String>();
122 return scope.Escape(result.ToLocalChecked());
123 }
124
125 private:
126 NAN_DISALLOW_ASSIGN_COPY_MOVE(JSON)
127#if NAN_JSON_H_NEED_PARSE
128 Nan::Callback parse_cb_;
129#endif // NAN_JSON_H_NEED_PARSE
130#if NAN_JSON_H_NEED_STRINGIFY
131 Nan::Callback stringify_cb_;
132#endif // NAN_JSON_H_NEED_STRINGIFY
133
134#if NAN_JSON_H_NEED_PARSE
135 inline v8::Local<v8::Value> parse(v8::Local<v8::Value> arg) {
136 assert(!parse_cb_.IsEmpty() && "parse_cb_ is empty");
137 AsyncResource resource("nan:JSON.parse");
138 return parse_cb_.Call(1, &arg, &resource).FromMaybe(v8::Local<v8::Value>());
139 }
140#endif // NAN_JSON_H_NEED_PARSE
141
142#if NAN_JSON_H_NEED_STRINGIFY
143 inline v8::Local<v8::Value> stringify(v8::Local<v8::Value> arg) {
144 assert(!stringify_cb_.IsEmpty() && "stringify_cb_ is empty");
145 AsyncResource resource("nan:JSON.stringify");
146 return stringify_cb_.Call(1, &arg, &resource)
147 .FromMaybe(v8::Local<v8::Value>());
148 }
149
150 inline v8::Local<v8::Value> stringify(v8::Local<v8::Value> arg,
151 v8::Local<v8::String> gap) {
152 assert(!stringify_cb_.IsEmpty() && "stringify_cb_ is empty");
153
154 v8::Local<v8::Value> argv[] = {
155 arg,
156 Nan::Null(),
157 gap
158 };
159 AsyncResource resource("nan:JSON.stringify");
160 return stringify_cb_.Call(3, argv, &resource)
161 .FromMaybe(v8::Local<v8::Value>());
162 }
163#endif // NAN_JSON_H_NEED_STRINGIFY
164};
165
166#endif // NAN_JSON_H_