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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_MAYBE_PRE_43_INL_H_
  10 #define NAN_MAYBE_PRE_43_INL_H_
  11
  12 template<typename T>
  13 class MaybeLocal {
  14  public:
  15   inline MaybeLocal() : val_(v8::Local<T>()) {}
  16
  17   template<typename S>
  18 # if NODE_MODULE_VERSION >= NODE_0_12_MODULE_VERSION
  19   inline
  20   MaybeLocal(v8::Local<S> that) : val_(that) {}  // NOLINT(runtime/explicit)
  21 # else
  22   inline
  23   MaybeLocal(v8::Local<S> that) :  // NOLINT(runtime/explicit)
  24       val_(*reinterpret_cast<v8::Local<T>*>(&that)) {}
  25 # endif
  26
  27   inline bool IsEmpty() const { return val_.IsEmpty(); }
  28
  29   template<typename S>
  30   inline bool ToLocal(v8::Local<S> *out) const {
  31     *out = val_;
  32     return !IsEmpty();
  33   }
  34
  35   inline v8::Local<T> ToLocalChecked() const {
  36 #if defined(V8_ENABLE_CHECKS)
  37     assert(!IsEmpty() && "ToLocalChecked is Empty");
  38 #endif  // V8_ENABLE_CHECKS
  39     return val_;
  40   }
  41
  42   template<typename S>
  43   inline v8::Local<S> FromMaybe(v8::Local<S> default_value) const {
  44     return IsEmpty() ? default_value : val_;
  45   }
  46
  47  private:
  48   v8::Local<T> val_;
  49 };
  50
  51 template<typename T>
  52 class Maybe {
  53  public:
  54   inline bool IsNothing() const { return !has_value_; }
  55   inline bool IsJust() const { return has_value_; }
  56
  57   inline T FromJust() const {
  58 #if defined(V8_ENABLE_CHECKS)
  59     assert(IsJust() && "FromJust is Nothing");
  60 #endif  // V8_ENABLE_CHECKS
  61     return value_;
  62   }
  63
  64   inline T FromMaybe(const T& default_value) const {
  65     return has_value_ ? value_ : default_value;
  66   }
  67
  68   inline bool operator==(const Maybe &other) const {
  69     return (IsJust() == other.IsJust()) &&
  70         (!IsJust() || FromJust() == other.FromJust());
  71   }
  72
  73   inline bool operator!=(const Maybe &other) const {
  74     return !operator==(other);
  75   }
  76
  77  private:
  78   Maybe() : has_value_(false) {}
  79   explicit Maybe(const T& t) : has_value_(true), value_(t) {}
  80   bool has_value_;
  81   T value_;
  82
  83   template<typename U>
  84   friend Maybe<U> Nothing();
  85   template<typename U>
  86   friend Maybe<U> Just(const U& u);
  87 };
  88
  89 template<typename T>
  90 inline Maybe<T> Nothing() {
  91   return Maybe<T>();
  92 }
  93
  94 template<typename T>
  95 inline Maybe<T> Just(const T& t) {
  96   return Maybe<T>(t);
  97 }
  98
  99 inline
 100 MaybeLocal<v8::String> ToDetailString(v8::Handle<v8::Value> val) {
 101   return MaybeLocal<v8::String>(val->ToDetailString());
 102 }
 103
 104 inline
 105 MaybeLocal<v8::Uint32> ToArrayIndex(v8::Handle<v8::Value> val) {
 106   return MaybeLocal<v8::Uint32>(val->ToArrayIndex());
 107 }
 108
 109 inline
 110 Maybe<bool> Equals(v8::Handle<v8::Value> a, v8::Handle<v8::Value>(b)) {
 111   return Just<bool>(a->Equals(b));
 112 }
 113
 114 inline
 115 MaybeLocal<v8::Object> NewInstance(v8::Handle<v8::Function> h) {
 116   return MaybeLocal<v8::Object>(h->NewInstance());
 117 }
 118
 119 inline
 120 MaybeLocal<v8::Object> NewInstance(
 121       v8::Local<v8::Function> h
 122     , int argc
 123     , v8::Local<v8::Value> argv[]) {
 124   return MaybeLocal<v8::Object>(h->NewInstance(argc, argv));
 125 }
 126
 127 inline
 128 MaybeLocal<v8::Object> NewInstance(v8::Handle<v8::ObjectTemplate> h) {
 129   return MaybeLocal<v8::Object>(h->NewInstance());
 130 }
 131
 132 inline
 133 MaybeLocal<v8::Function> GetFunction(v8::Handle<v8::FunctionTemplate> t) {
 134   return MaybeLocal<v8::Function>(t->GetFunction());
 135 }
 136
 137 inline Maybe<bool> Set(
 138     v8::Handle<v8::Object> obj
 139   , v8::Handle<v8::Value> key
 140   , v8::Handle<v8::Value> value) {
 141   return Just<bool>(obj->Set(key, value));
 142 }
 143
 144 inline Maybe<bool> Set(
 145     v8::Handle<v8::Object> obj
 146   , uint32_t index
 147   , v8::Handle<v8::Value> value) {
 148   return Just<bool>(obj->Set(index, value));
 149 }
 150
 151 inline Maybe<bool> ForceSet(
 152     v8::Handle<v8::Object> obj
 153   , v8::Handle<v8::Value> key
 154   , v8::Handle<v8::Value> value
 155   , v8::PropertyAttribute attribs = v8::None) {
 156   return Just<bool>(obj->ForceSet(key, value, attribs));
 157 }
 158
 159 inline MaybeLocal<v8::Value> Get(
 160     v8::Handle<v8::Object> obj
 161   , v8::Handle<v8::Value> key) {
 162   return MaybeLocal<v8::Value>(obj->Get(key));
 163 }
 164
 165 inline MaybeLocal<v8::Value> Get(
 166     v8::Handle<v8::Object> obj
 167   , uint32_t index) {
 168   return MaybeLocal<v8::Value>(obj->Get(index));
 169 }
 170
 171 inline Maybe<v8::PropertyAttribute> GetPropertyAttributes(
 172     v8::Handle<v8::Object> obj
 173   , v8::Handle<v8::Value> key) {
 174   return Just<v8::PropertyAttribute>(obj->GetPropertyAttributes(key));
 175 }
 176
 177 inline Maybe<bool> Has(
 178     v8::Handle<v8::Object> obj
 179   , v8::Handle<v8::String> key) {
 180   return Just<bool>(obj->Has(key));
 181 }
 182
 183 inline Maybe<bool> Has(
 184     v8::Handle<v8::Object> obj
 185   , uint32_t index) {
 186   return Just<bool>(obj->Has(index));
 187 }
 188
 189 inline Maybe<bool> Delete(
 190     v8::Handle<v8::Object> obj
 191   , v8::Handle<v8::String> key) {
 192   return Just<bool>(obj->Delete(key));
 193 }
 194
 195 inline Maybe<bool> Delete(
 196     v8::Handle<v8::Object> obj
 197   , uint32_t index) {
 198   return Just<bool>(obj->Delete(index));
 199 }
 200
 201 inline
 202 MaybeLocal<v8::Array> GetPropertyNames(v8::Handle<v8::Object> obj) {
 203   return MaybeLocal<v8::Array>(obj->GetPropertyNames());
 204 }
 205
 206 inline
 207 MaybeLocal<v8::Array> GetOwnPropertyNames(v8::Handle<v8::Object> obj) {
 208   return MaybeLocal<v8::Array>(obj->GetOwnPropertyNames());
 209 }
 210
 211 inline Maybe<bool> SetPrototype(
 212     v8::Handle<v8::Object> obj
 213   , v8::Handle<v8::Value> prototype) {
 214   return Just<bool>(obj->SetPrototype(prototype));
 215 }
 216
 217 inline MaybeLocal<v8::String> ObjectProtoToString(
 218     v8::Handle<v8::Object> obj) {
 219   return MaybeLocal<v8::String>(obj->ObjectProtoToString());
 220 }
 221
 222 inline Maybe<bool> HasOwnProperty(
 223     v8::Handle<v8::Object> obj
 224   , v8::Handle<v8::String> key) {
 225   return Just<bool>(obj->HasOwnProperty(key));
 226 }
 227
 228 inline Maybe<bool> HasRealNamedProperty(
 229     v8::Handle<v8::Object> obj
 230   , v8::Handle<v8::String> key) {
 231   return Just<bool>(obj->HasRealNamedProperty(key));
 232 }
 233
 234 inline Maybe<bool> HasRealIndexedProperty(
 235     v8::Handle<v8::Object> obj
 236   , uint32_t index) {
 237   return Just<bool>(obj->HasRealIndexedProperty(index));
 238 }
 239
 240 inline Maybe<bool> HasRealNamedCallbackProperty(
 241     v8::Handle<v8::Object> obj
 242   , v8::Handle<v8::String> key) {
 243   return Just<bool>(obj->HasRealNamedCallbackProperty(key));
 244 }
 245
 246 inline MaybeLocal<v8::Value> GetRealNamedPropertyInPrototypeChain(
 247     v8::Handle<v8::Object> obj
 248   , v8::Handle<v8::String> key) {
 249   return MaybeLocal<v8::Value>(
 250       obj->GetRealNamedPropertyInPrototypeChain(key));
 251 }
 252
 253 inline MaybeLocal<v8::Value> GetRealNamedProperty(
 254     v8::Handle<v8::Object> obj
 255   , v8::Handle<v8::String> key) {
 256   return MaybeLocal<v8::Value>(obj->GetRealNamedProperty(key));
 257 }
 258
 259 inline MaybeLocal<v8::Value> CallAsFunction(
 260     v8::Handle<v8::Object> obj
 261   , v8::Handle<v8::Object> recv
 262   , int argc
 263   , v8::Handle<v8::Value> argv[]) {
 264   return MaybeLocal<v8::Value>(obj->CallAsFunction(recv, argc, argv));
 265 }
 266
 267 inline MaybeLocal<v8::Value> CallAsConstructor(
 268     v8::Handle<v8::Object> obj
 269   , int argc
 270   , v8::Local<v8::Value> argv[]) {
 271   return MaybeLocal<v8::Value>(obj->CallAsConstructor(argc, argv));
 272 }
 273
 274 inline
 275 MaybeLocal<v8::String> GetSourceLine(v8::Handle<v8::Message> msg) {
 276   return MaybeLocal<v8::String>(msg->GetSourceLine());
 277 }
 278
 279 inline Maybe<int> GetLineNumber(v8::Handle<v8::Message> msg) {
 280   return Just<int>(msg->GetLineNumber());
 281 }
 282
 283 inline Maybe<int> GetStartColumn(v8::Handle<v8::Message> msg) {
 284   return Just<int>(msg->GetStartColumn());
 285 }
 286
 287 inline Maybe<int> GetEndColumn(v8::Handle<v8::Message> msg) {
 288   return Just<int>(msg->GetEndColumn());
 289 }
 290
 291 inline MaybeLocal<v8::Object> CloneElementAt(
 292     v8::Handle<v8::Array> array
 293   , uint32_t index) {
 294   return MaybeLocal<v8::Object>(array->CloneElementAt(index));
 295 }
 296
 297 inline MaybeLocal<v8::Value> Call(
 298     v8::Local<v8::Function> fun
 299   , v8::Local<v8::Object> recv
 300   , int argc
 301   , v8::Local<v8::Value> argv[]) {
 302   return MaybeLocal<v8::Value>(fun->Call(recv, argc, argv));
 303 }
 304
 305 #endif  // NAN_MAYBE_PRE_43_INL_H_