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node_modules/nan/nan_json.h

@@ -0,0 +1,166 @@
+/*********************************************************************
+ * 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_