src: add napi_date

PR-URL: #497
Reviewed-By: NickNaso <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
Reviewed-By: Gabriel Schulhof <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>

Author: mathiask88

README.md

@@ -75,6 +75,7 @@ The following is the documentation for node-addon-api.
     - [String](doc/string.md)
     - [Name](doc/basic_types.md#name)
     - [Number](doc/number.md)
+    - [Date](doc/date.md)
     - [BigInt](doc/bigint.md)
     - [Boolean](doc/boolean.md)
     - [Env](doc/env.md)

doc/basic_types.md

@@ -257,6 +257,14 @@ bool Napi::Value::IsExternal() const;
 Returns `true` if the underlying value is a N-API external object or `false`
 otherwise.
 
+#### IsDate
+```cpp
+bool Napi::Value::IsDate() const;
+```
+
+Returns `true` if the underlying value is a JavaScript `Date` or `false`
+otherwise.
+
 #### ToBoolean
 ```cpp
 Napi::Boolean Napi::Value::ToBoolean() const;

doc/date.md

@@ -0,0 +1,68 @@
+# Date
+
+`Napi::Date` class is a representation of the JavaScript `Date` object. The
+`Napi::Date` class inherits its behavior from `Napi::Value` class
+(for more info see [`Napi::Value`](value.md))
+
+## Methods
+
+### Constructor
+
+Creates a new _empty_ instance of a `Napi::Date` object.
+
+```cpp
+Napi::Date::Date();
+```
+
+Creates a new _non-empty_ instance of a `Napi::Date` object.
+
+```cpp
+Napi::Date::Date(napi_env env, napi_value value);
+```
+
+ - `[in] env`: The environment in which to construct the `Napi::Date` object.
+ - `[in] value`: The `napi_value` which is a handle for a JavaScript `Date`.
+
+### New
+
+Creates a new instance of a `Napi::Date` object.
+
+```cpp
+static Napi::Date Napi::Date::New(Napi::Env env, double value);
+```
+
+ - `[in] env`: The environment in which to construct the `Napi::Date` object.
+ - `[in] value`: The time value the JavaScript `Date` will contain represented
+  as the number of milliseconds since 1 January 1970 00:00:00 UTC.
+
+Returns a new instance of `Napi::Date` object.
+
+### ValueOf
+
+```cpp
+double Napi::Date::ValueOf() const;
+```
+
+Returns the time value as `double` primitive represented as the number of
+ milliseconds since 1 January 1970 00:00:00 UTC.
+
+## Operators
+
+### operator double
+
+Converts a `Napi::Date` value to a `double` primitive.
+
+```cpp
+Napi::Date::operator double() const;
+```
+
+### Example
+
+The following shows an example of casting a `Napi::Date` value to a `double`
+ primitive.
+
+```cpp
+double operatorVal = Napi::Date::New(Env(), 0); // Napi::Date to double
+// or
+auto instanceVal = info[0].As<Napi::Date>().ValueOf();
+```

doc/value.md

@@ -10,6 +10,7 @@ The following classes inherit, either directly or indirectly, from `Napi::Value`
 - [`Napi::ArrayBuffer`](array_buffer.md)
 - [`Napi::Boolean`](boolean.md)
 - [`Napi::Buffer`](buffer.md)
+- [`Napi::Date`](date.md)
 - [`Napi::External`](external.md)
 - [`Napi::Function`](function.md)
 - [`Napi::Name`](name.md)
@@ -226,6 +227,14 @@ bool Napi::Value::IsBuffer() const;
 
 Returns a `bool` indicating if this `Napi::Value` is a Node buffer.
 
+### IsDate
+
+```cpp
+bool Napi::Value::IsDate() const;
+```
+
+Returns a `bool` indicating if this `Napi::Value` is a JavaScript date.
+
 ### As
 
 ```cpp

napi-inl.h

@@ -379,6 +379,19 @@ inline bool Value::IsBigInt() const {
 }
 #endif  // NAPI_EXPERIMENTAL
 
+#if (NAPI_VERSION > 4)
+inline bool Value::IsDate() const {
+  if (IsEmpty()) {
+    return false;
+  }
+
+  bool result;
+  napi_status status = napi_is_date(_env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, false);
+  return result;
+}
+#endif
+
 inline bool Value::IsString() const {
   return Type() == napi_string;
 }
@@ -660,6 +673,37 @@ inline void BigInt::ToWords(int* sign_bit, size_t* word_count, uint64_t* words)
 }
 #endif  // NAPI_EXPERIMENTAL
 
+#if (NAPI_VERSION > 4)
+////////////////////////////////////////////////////////////////////////////////
+// Date Class
+////////////////////////////////////////////////////////////////////////////////
+
+inline Date Date::New(napi_env env, double val) {
+  napi_value value;
+  napi_status status = napi_create_date(env, val, &value);
+  NAPI_THROW_IF_FAILED(env, status, Date());
+  return Date(env, value);
+}
+
+inline Date::Date() : Value() {
+}
+
+inline Date::Date(napi_env env, napi_value value) : Value(env, value) {
+}
+
+inline Date::operator double() const {
+  return ValueOf();
+}
+
+inline double Date::ValueOf() const {
+  double result;
+  napi_status status = napi_get_date_value(
+      _env, _value, &result);
+  NAPI_THROW_IF_FAILED(_env, status, 0);
+  return result;
+}
+#endif
+
 ////////////////////////////////////////////////////////////////////////////////
 // Name class
 ////////////////////////////////////////////////////////////////////////////////

napi.h

@@ -116,6 +116,9 @@ namespace Napi {
 #if (NAPI_VERSION > 2147483646)
   class BigInt;
 #endif  // NAPI_EXPERIMENTAL
+#if (NAPI_VERSION > 4)
+  class Date;
+#endif
   class String;
   class Object;
   class Array;
@@ -246,6 +249,9 @@ namespace Napi {
 #if (NAPI_VERSION > 2147483646)
     bool IsBigInt() const;      ///< Tests if a value is a JavaScript bigint.
 #endif  // NAPI_EXPERIMENTAL
+#if (NAPI_VERSION > 4)
+    bool IsDate() const;        ///< Tests if a value is a JavaScript date.
+#endif
     bool IsString() const;      ///< Tests if a value is a JavaScript string.
     bool IsSymbol() const;      ///< Tests if a value is a JavaScript symbol.
     bool IsArray() const;       ///< Tests if a value is a JavaScript array.
@@ -358,6 +364,24 @@ namespace Napi {
   };
 #endif  // NAPI_EXPERIMENTAL
 
+#if (NAPI_VERSION > 4)
+  /// A JavaScript date value.
+  class Date : public Value {
+  public:
+    /// Creates a new Date value from a double primitive.
+    static Date New(
+      napi_env env, ///< N-API environment
+      double value  ///< Number value
+    );
+
+    Date();                               ///< Creates a new _empty_ Date instance.
+    Date(napi_env env, napi_value value); ///< Wraps a N-API value primitive.
+    operator double() const;              ///< Converts a Date value to double primitive
+
+    double ValueOf() const;   ///< Converts a Date value to a double primitive.
+  };
+  #endif
+
   /// A JavaScript string or symbol value (that can be used as a property name).
   class Name : public Value {
   public:

test/binding.cc

@@ -20,6 +20,9 @@ Object InitBuffer(Env env);
 #if (NAPI_VERSION > 2)
 Object InitCallbackScope(Env env);
 #endif
+#if (NAPI_VERSION > 4)
+Object InitDate(Env env);
+#endif
 Object InitDataView(Env env);
 Object InitDataViewReadWrite(Env env);
 Object InitError(Env env);
@@ -56,6 +59,9 @@ Object Init(Env env, Object exports) {
 // released in once it is no longer experimental
 #if (NAPI_VERSION > 2147483646)
   exports.Set("bigint", InitBigInt(env));
+#endif
+#if (NAPI_VERSION > 4)
+  exports.Set("date", InitDate(env));
 #endif
   exports.Set("buffer", InitBuffer(env));
 #if (NAPI_VERSION > 2)

test/binding.gyp

@@ -14,6 +14,7 @@
         'basic_types/number.cc',
         'basic_types/value.cc',
         'bigint.cc',
+        'date.cc',
         'binding.cc',
         'buffer.cc',
         'callbackscope.cc',

test/date.cc

@@ -0,0 +1,45 @@
+#define NAPI_EXPERIMENTAL
+#include "napi.h"
+
+using namespace Napi;
+
+#if (NAPI_VERSION > 4)
+namespace {
+
+Value CreateDate(const CallbackInfo& info) {
+  double input = info[0].As<Number>().DoubleValue();
+
+  return Date::New(info.Env(), input);
+}
+
+Value IsDate(const CallbackInfo& info) {
+  Date input = info[0].As<Date>();
+
+  return Boolean::New(info.Env(), input.IsDate());
+}
+
+Value ValueOf(const CallbackInfo& info) {
+  Date input = info[0].As<Date>();
+
+  return Number::New(info.Env(), input.ValueOf());
+}
+
+Value OperatorValue(const CallbackInfo& info) {
+  Date input = info[0].As<Date>();
+
+  return Boolean::New(info.Env(), input.ValueOf() == static_cast<double>(input));
+}
+
+}  // anonymous namespace
+
+Object InitDate(Env env) {
+  Object exports = Object::New(env);
+  exports["CreateDate"] = Function::New(env, CreateDate);
+  exports["IsDate"] = Function::New(env, IsDate);
+  exports["ValueOf"] = Function::New(env, ValueOf);
+  exports["OperatorValue"] = Function::New(env, OperatorValue);
+
+  return exports;
+}
+
+#endif

test/date.js

@@ -0,0 +1,20 @@
+'use strict';
+
+const buildType = process.config.target_defaults.default_configuration;
+const assert = require('assert');
+
+test(require(`./build/${buildType}/binding.node`));
+test(require(`./build/${buildType}/binding_noexcept.node`));
+
+function test(binding) {
+  const {
+    CreateDate,
+    IsDate,
+    ValueOf,
+    OperatorValue,
+  } = binding.date;
+  assert.deepStrictEqual(CreateDate(0), new Date(0));
+  assert.strictEqual(IsDate(new Date(0)), true);
+  assert.strictEqual(ValueOf(new Date(42)), 42);
+  assert.strictEqual(OperatorValue(new Date(42)), true);
+}