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| 1 | +/********************************************************************* |
| 2 | + * NAN - Native Abstractions for Node.js |
| 3 | + * |
| 4 | + * Copyright (c) 2017 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_6_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_6_0_MODULE_VERSION |
| 23 | + |
| 24 | +class 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 | +#if NODE_MODULE_VERSION > NODE_6_0_MODULE_VERSION |
| 81 | + Nan::MaybeLocal<v8::Value> result = |
| 82 | + v8::JSON::Parse(Nan::GetCurrentContext(), json_string); |
| 83 | + |
| 84 | + if (result.IsEmpty()) return v8::Local<v8::Value>(); |
| 85 | + return scope.Escape(result.ToLocalChecked()); |
| 86 | +#else |
| 87 | + return scope.Escape(v8::JSON::Parse(json_string)); |
| 88 | +#endif // NODE_MODULE_VERSION > NODE_6_0_MODULE_VERSION |
| 89 | +#endif // NAN_JSON_H_NEED_PARSE |
| 90 | + } |
| 91 | + |
| 92 | + inline |
| 93 | + Nan::MaybeLocal<v8::String> Stringify(v8::Local<v8::Object> json_object) { |
| 94 | + Nan::EscapableHandleScope scope; |
| 95 | + Nan::MaybeLocal<v8::String> result = |
| 96 | +#if NAN_JSON_H_NEED_STRINGIFY |
| 97 | + Nan::To<v8::String>(stringify(json_object)); |
| 98 | +#else |
| 99 | + v8::JSON::Stringify(Nan::GetCurrentContext(), json_object); |
| 100 | +#endif // NAN_JSON_H_NEED_STRINGIFY |
| 101 | + if (result.IsEmpty()) return v8::Local<v8::String>(); |
| 102 | + return scope.Escape(result.ToLocalChecked()); |
| 103 | + } |
| 104 | + |
| 105 | + inline |
| 106 | + Nan::MaybeLocal<v8::String> Stringify(v8::Local<v8::Object> json_object, |
| 107 | + v8::Local<v8::String> gap) { |
| 108 | + Nan::EscapableHandleScope scope; |
| 109 | + Nan::MaybeLocal<v8::String> result = |
| 110 | +#if NAN_JSON_H_NEED_STRINGIFY |
| 111 | + Nan::To<v8::String>(stringify(json_object, gap)); |
| 112 | +#else |
| 113 | + v8::JSON::Stringify(Nan::GetCurrentContext(), json_object, gap); |
| 114 | +#endif // NAN_JSON_H_NEED_STRINGIFY |
| 115 | + if (result.IsEmpty()) return v8::Local<v8::String>(); |
| 116 | + return scope.Escape(result.ToLocalChecked()); |
| 117 | + } |
| 118 | + |
| 119 | + private: |
| 120 | + NAN_DISALLOW_ASSIGN_COPY_MOVE(JSON) |
| 121 | +#if NAN_JSON_H_NEED_PARSE |
| 122 | + Nan::Callback parse_cb_; |
| 123 | +#endif // NAN_JSON_H_NEED_PARSE |
| 124 | +#if NAN_JSON_H_NEED_STRINGIFY |
| 125 | + Nan::Callback stringify_cb_; |
| 126 | +#endif // NAN_JSON_H_NEED_STRINGIFY |
| 127 | + |
| 128 | +#if NAN_JSON_H_NEED_PARSE |
| 129 | + inline v8::Local<v8::Value> parse(v8::Local<v8::Value> arg) { |
| 130 | + assert(!parse_cb_.IsEmpty() && "parse_cb_ is empty"); |
| 131 | + return parse_cb_.Call(1, &arg); |
| 132 | + } |
| 133 | +#endif // NAN_JSON_H_NEED_PARSE |
| 134 | + |
| 135 | +#if NAN_JSON_H_NEED_STRINGIFY |
| 136 | + inline v8::Local<v8::Value> stringify(v8::Local<v8::Value> arg) { |
| 137 | + assert(!stringify_cb_.IsEmpty() && "stringify_cb_ is empty"); |
| 138 | + return stringify_cb_.Call(1, &arg); |
| 139 | + } |
| 140 | + |
| 141 | + inline v8::Local<v8::Value> stringify(v8::Local<v8::Value> arg, |
| 142 | + v8::Local<v8::String> gap) { |
| 143 | + assert(!stringify_cb_.IsEmpty() && "stringify_cb_ is empty"); |
| 144 | + |
| 145 | + v8::Local<v8::Value> argv[] = { |
| 146 | + arg, |
| 147 | + Nan::Null(), |
| 148 | + gap |
| 149 | + }; |
| 150 | + return stringify_cb_.Call(3, argv); |
| 151 | + } |
| 152 | +#endif // NAN_JSON_H_NEED_STRINGIFY |
| 153 | +}; |
| 154 | + |
| 155 | +#endif // NAN_JSON_H_ |
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