nan_json.h
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/*********************************************************************
* NAN - Native Abstractions for Node.js
*
* Copyright (c) 2018 NAN contributors
*
* MIT License <https://github.com/nodejs/nan/blob/master/LICENSE.md>
********************************************************************/
#ifndef NAN_JSON_H_
#define NAN_JSON_H_
#if NODE_MODULE_VERSION < NODE_0_12_MODULE_VERSION
#define NAN_JSON_H_NEED_PARSE 1
#else
#define NAN_JSON_H_NEED_PARSE 0
#endif // NODE_MODULE_VERSION < NODE_0_12_MODULE_VERSION
#if NODE_MODULE_VERSION >= NODE_7_0_MODULE_VERSION
#define NAN_JSON_H_NEED_STRINGIFY 0
#else
#define NAN_JSON_H_NEED_STRINGIFY 1
#endif // NODE_MODULE_VERSION >= NODE_7_0_MODULE_VERSION
class JSON {
public:
JSON() {
#if NAN_JSON_H_NEED_PARSE + NAN_JSON_H_NEED_STRINGIFY
Nan::HandleScope scope;
Nan::MaybeLocal<v8::Value> maybe_global_json = Nan::Get(
Nan::GetCurrentContext()->Global(),
Nan::New("JSON").ToLocalChecked()
);
assert(!maybe_global_json.IsEmpty() && "global JSON is empty");
v8::Local<v8::Value> val_global_json = maybe_global_json.ToLocalChecked();
assert(val_global_json->IsObject() && "global JSON is not an object");
Nan::MaybeLocal<v8::Object> maybe_obj_global_json =
Nan::To<v8::Object>(val_global_json);
assert(!maybe_obj_global_json.IsEmpty() && "global JSON object is empty");
v8::Local<v8::Object> global_json = maybe_obj_global_json.ToLocalChecked();
#if NAN_JSON_H_NEED_PARSE
Nan::MaybeLocal<v8::Value> maybe_parse_method = Nan::Get(
global_json, Nan::New("parse").ToLocalChecked()
);
assert(!maybe_parse_method.IsEmpty() && "JSON.parse is empty");
v8::Local<v8::Value> parse_method = maybe_parse_method.ToLocalChecked();
assert(parse_method->IsFunction() && "JSON.parse is not a function");
parse_cb_.Reset(parse_method.As<v8::Function>());
#endif // NAN_JSON_H_NEED_PARSE
#if NAN_JSON_H_NEED_STRINGIFY
Nan::MaybeLocal<v8::Value> maybe_stringify_method = Nan::Get(
global_json, Nan::New("stringify").ToLocalChecked()
);
assert(!maybe_stringify_method.IsEmpty() && "JSON.stringify is empty");
v8::Local<v8::Value> stringify_method =
maybe_stringify_method.ToLocalChecked();
assert(
stringify_method->IsFunction() && "JSON.stringify is not a function"
);
stringify_cb_.Reset(stringify_method.As<v8::Function>());
#endif // NAN_JSON_H_NEED_STRINGIFY
#endif // NAN_JSON_H_NEED_PARSE + NAN_JSON_H_NEED_STRINGIFY
}
inline
Nan::MaybeLocal<v8::Value> Parse(v8::Local<v8::String> json_string) {
Nan::EscapableHandleScope scope;
#if NAN_JSON_H_NEED_PARSE
return scope.Escape(parse(json_string));
#else
Nan::MaybeLocal<v8::Value> result;
#if NODE_MODULE_VERSION >= NODE_0_12_MODULE_VERSION && \
NODE_MODULE_VERSION <= IOJS_2_0_MODULE_VERSION
result = v8::JSON::Parse(json_string);
#else
#if NODE_MODULE_VERSION > NODE_6_0_MODULE_VERSION
v8::Local<v8::Context> context_or_isolate = Nan::GetCurrentContext();
#else
v8::Isolate* context_or_isolate = v8::Isolate::GetCurrent();
#endif // NODE_MODULE_VERSION > NODE_6_0_MODULE_VERSION
result = v8::JSON::Parse(context_or_isolate, json_string);
#endif // NODE_MODULE_VERSION >= NODE_0_12_MODULE_VERSION &&
// NODE_MODULE_VERSION <= IOJS_2_0_MODULE_VERSION
if (result.IsEmpty()) return v8::Local<v8::Value>();
return scope.Escape(result.ToLocalChecked());
#endif // NAN_JSON_H_NEED_PARSE
}
inline
Nan::MaybeLocal<v8::String> Stringify(v8::Local<v8::Object> json_object) {
Nan::EscapableHandleScope scope;
Nan::MaybeLocal<v8::String> result =
#if NAN_JSON_H_NEED_STRINGIFY
Nan::To<v8::String>(stringify(json_object));
#else
v8::JSON::Stringify(Nan::GetCurrentContext(), json_object);
#endif // NAN_JSON_H_NEED_STRINGIFY
if (result.IsEmpty()) return v8::Local<v8::String>();
return scope.Escape(result.ToLocalChecked());
}
inline
Nan::MaybeLocal<v8::String> Stringify(v8::Local<v8::Object> json_object,
v8::Local<v8::String> gap) {
Nan::EscapableHandleScope scope;
Nan::MaybeLocal<v8::String> result =
#if NAN_JSON_H_NEED_STRINGIFY
Nan::To<v8::String>(stringify(json_object, gap));
#else
v8::JSON::Stringify(Nan::GetCurrentContext(), json_object, gap);
#endif // NAN_JSON_H_NEED_STRINGIFY
if (result.IsEmpty()) return v8::Local<v8::String>();
return scope.Escape(result.ToLocalChecked());
}
private:
NAN_DISALLOW_ASSIGN_COPY_MOVE(JSON)
#if NAN_JSON_H_NEED_PARSE
Nan::Callback parse_cb_;
#endif // NAN_JSON_H_NEED_PARSE
#if NAN_JSON_H_NEED_STRINGIFY
Nan::Callback stringify_cb_;
#endif // NAN_JSON_H_NEED_STRINGIFY
#if NAN_JSON_H_NEED_PARSE
inline v8::Local<v8::Value> parse(v8::Local<v8::Value> arg) {
assert(!parse_cb_.IsEmpty() && "parse_cb_ is empty");
AsyncResource resource("nan:JSON.parse");
return parse_cb_.Call(1, &arg, &resource).FromMaybe(v8::Local<v8::Value>());
}
#endif // NAN_JSON_H_NEED_PARSE
#if NAN_JSON_H_NEED_STRINGIFY
inline v8::Local<v8::Value> stringify(v8::Local<v8::Value> arg) {
assert(!stringify_cb_.IsEmpty() && "stringify_cb_ is empty");
AsyncResource resource("nan:JSON.stringify");
return stringify_cb_.Call(1, &arg, &resource)
.FromMaybe(v8::Local<v8::Value>());
}
inline v8::Local<v8::Value> stringify(v8::Local<v8::Value> arg,
v8::Local<v8::String> gap) {
assert(!stringify_cb_.IsEmpty() && "stringify_cb_ is empty");
v8::Local<v8::Value> argv[] = {
arg,
Nan::Null(),
gap
};
AsyncResource resource("nan:JSON.stringify");
return stringify_cb_.Call(3, argv, &resource)
.FromMaybe(v8::Local<v8::Value>());
}
#endif // NAN_JSON_H_NEED_STRINGIFY
};
#endif // NAN_JSON_H_