n-api: implement date object

Implements `napi_create_date()` as well as `napi_is_date()` to
allow working with JavaScript Date objects.

PR-URL: https://github.com/nodejs/node/pull/25917
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/n-api.md

@@ -243,6 +243,7 @@ typedef enum {
   napi_queue_full,
   napi_closing,
   napi_bigint_expected,
+  napi_date_expected,
 } napi_status;
 ```
 If additional information is required upon an API returning a failed status,
@@ -1527,6 +1528,31 @@ This API allocates a `node::Buffer` object and initializes it with data copied
 from the passed-in buffer. While this is still a fully-supported data
 structure, in most cases using a `TypedArray` will suffice.
 
+#### napi_create_date
+<!-- YAML
+added: REPLACEME
+napiVersion: 4
+-->
+
+> Stability: 1 - Experimental
+
+```C
+napi_status napi_create_date(napi_env env,
+                             double time,
+                             napi_value* result);
+```
+
+- `[in] env`: The environment that the API is invoked under.
+- `[in] time`: ECMAScript time value in milliseconds since 01 January, 1970 UTC.
+- `[out] result`: A `napi_value` representing a JavaScript `Date`.
+
+Returns `napi_ok` if the API succeeded.
+
+This API allocates a JavaScript `Date` object.
+
+JavaScript `Date` objects are described in
+[Section 20.3][] of the ECMAScript Language Specification.
+
 #### napi_create_external
 <!-- YAML
 added: v8.0.0
@@ -2147,6 +2173,31 @@ Returns `napi_ok` if the API succeeded.
 
 This API returns various properties of a `DataView`.
 
+#### napi_get_date_value
+<!-- YAML
+added: REPLACEME
+napiVersion: 4
+-->
+
+> Stability: 1 - Experimental
+
+```C
+napi_status napi_get_date_value(napi_env env,
+                                napi_value value,
+                                double* result)
+```
+
+- `[in] env`: The environment that the API is invoked under.
+- `[in] value`: `napi_value` representing a JavaScript `Date`.
+- `[out] result`: Time value as a `double` represented as milliseconds
+since midnight at the beginning of 01 January, 1970 UTC.
+
+Returns `napi_ok` if the API succeeded. If a non-date `napi_value` is passed
+in it returns `napi_date_expected`.
+
+This API returns the C double primitive of time value for the given JavaScript
+`Date`.
+
 #### napi_get_value_bool
 <!-- YAML
 added: v8.0.0
@@ -2731,6 +2782,27 @@ Returns `napi_ok` if the API succeeded.
 
 This API checks if the `Object` passed in is a buffer.
 
+### napi_is_date
+<!-- YAML
+added: REPLACEME
+napiVersion: 4
+-->
+
+> Stability: 1 - Experimental
+
+```C
+napi_status napi_is_date(napi_env env, napi_value value, bool* result)
+```
+
+- `[in] env`: The environment that the API is invoked under.
+- `[in] value`: The JavaScript value to check.
+- `[out] result`: Whether the given `napi_value` represents a JavaScript `Date`
+object.
+
+Returns `napi_ok` if the API succeeded.
+
+This API checks if the `Object` passed in is a date.
+
 ### napi_is_error
 <!-- YAML
 added: v8.0.0
@@ -4712,6 +4784,7 @@ This API may only be called from the main thread.
 [Object Lifetime Management]: #n_api_object_lifetime_management
 [Object Wrap]: #n_api_object_wrap
 [Section 12.5.5]: https://tc39.github.io/ecma262/#sec-typeof-operator
+[Section 20.3]: https://tc39.github.io/ecma262/#sec-date-objects
 [Section 22.1]: https://tc39.github.io/ecma262/#sec-array-objects
 [Section 22.2]: https://tc39.github.io/ecma262/#sec-typedarray-objects
 [Section 24.1]: https://tc39.github.io/ecma262/#sec-arraybuffer-objects

src/js_native_api.h

@@ -449,6 +449,20 @@ NAPI_EXTERN napi_status napi_adjust_external_memory(napi_env env,
 
 #ifdef NAPI_EXPERIMENTAL
 
+// Dates
+NAPI_EXTERN napi_status napi_create_date(napi_env env,
+                                         double time,
+                                         napi_value* result);
+
+NAPI_EXTERN napi_status napi_is_date(napi_env env,
+                                     napi_value value,
+                                     bool* is_date);
+
+NAPI_EXTERN napi_status napi_get_date_value(napi_env env,
+                                            napi_value value,
+                                            double* result);
+
+// BigInt
 NAPI_EXTERN napi_status napi_create_bigint_int64(napi_env env,
                                                  int64_t value,
                                                  napi_value* result);

src/js_native_api_types.h

@@ -76,6 +76,7 @@ typedef enum {
   napi_queue_full,
   napi_closing,
   napi_bigint_expected,
+  napi_date_expected,
 } napi_status;
 
 typedef napi_value (*napi_callback)(napi_env env,

src/js_native_api_v8.cc

@@ -2887,6 +2887,48 @@ napi_status napi_is_promise(napi_env env,
   return napi_clear_last_error(env);
 }
 
+napi_status napi_create_date(napi_env env,
+                             double time,
+                             napi_value* result) {
+  NAPI_PREAMBLE(env);
+  CHECK_ARG(env, result);
+
+  v8::MaybeLocal<v8::Value> maybe_date = v8::Date::New(env->context(), time);
+  CHECK_MAYBE_EMPTY(env, maybe_date, napi_generic_failure);
+
+  *result = v8impl::JsValueFromV8LocalValue(maybe_date.ToLocalChecked());
+
+  return GET_RETURN_STATUS(env);
+}
+
+napi_status napi_is_date(napi_env env,
+                         napi_value value,
+                         bool* is_date) {
+  CHECK_ENV(env);
+  CHECK_ARG(env, value);
+  CHECK_ARG(env, is_date);
+
+  *is_date = v8impl::V8LocalValueFromJsValue(value)->IsDate();
+
+  return napi_clear_last_error(env);
+}
+
+napi_status napi_get_date_value(napi_env env,
+                                napi_value value,
+                                double* result) {
+  NAPI_PREAMBLE(env);
+  CHECK_ARG(env, value);
+  CHECK_ARG(env, result);
+
+  v8::Local<v8::Value> val = v8impl::V8LocalValueFromJsValue(value);
+  RETURN_STATUS_IF_FALSE(env, val->IsDate(), napi_date_expected);
+
+  v8::Local<v8::Date> date = val.As<v8::Date>();
+  *result = date->ValueOf();
+
+  return GET_RETURN_STATUS(env);
+}
+
 napi_status napi_run_script(napi_env env,
                             napi_value script,
                             napi_value* result) {

test/js-native-api/test_date/binding.gyp

@@ -0,0 +1,11 @@
+{
+  "targets": [
+    {
+      "target_name": "test_date",
+      "sources": [
+        "../entry_point.c",
+        "test_date.c"
+      ]
+    }
+  ]
+}

test/js-native-api/test_date/test.js

@@ -0,0 +1,21 @@
+'use strict';
+
+const common = require('../../common');
+
+// This tests the date-related n-api calls
+
+const assert = require('assert');
+const test_date = require(`./build/${common.buildType}/test_date`);
+
+const dateTypeTestDate = test_date.createDate(1549183351);
+assert.strictEqual(test_date.isDate(dateTypeTestDate), true);
+
+assert.strictEqual(test_date.isDate(new Date(1549183351)), true);
+
+assert.strictEqual(test_date.isDate(2.4), false);
+assert.strictEqual(test_date.isDate('not a date'), false);
+assert.strictEqual(test_date.isDate(undefined), false);
+assert.strictEqual(test_date.isDate(null), false);
+assert.strictEqual(test_date.isDate({}), false);
+
+assert.strictEqual(test_date.getDateValue(new Date(1549183351)), 1549183351);

test/js-native-api/test_date/test_date.c

@@ -0,0 +1,65 @@
+#define NAPI_EXPERIMENTAL
+
+#include <js_native_api.h>
+#include "../common.h"
+
+static napi_value createDate(napi_env env, napi_callback_info info) {
+  size_t argc = 1;
+  napi_value args[1];
+  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  NAPI_ASSERT(env, argc >= 1, "Wrong number of arguments");
+
+  napi_valuetype valuetype0;
+  NAPI_CALL(env, napi_typeof(env, args[0], &valuetype0));
+
+  NAPI_ASSERT(env, valuetype0 == napi_number,
+              "Wrong type of arguments. Expects a number as first argument.");
+
+  double time;
+  NAPI_CALL(env, napi_get_value_double(env, args[0], &time));
+
+  napi_value date;
+  NAPI_CALL(env, napi_create_date(env, time, &date));
+
+  return date;
+}
+
+static napi_value isDate(napi_env env, napi_callback_info info) {
+  napi_value date, result;
+  size_t argc = 1;
+  bool is_date;
+
+  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, &date, NULL, NULL));
+  NAPI_CALL(env, napi_is_date(env, date, &is_date));
+  NAPI_CALL(env, napi_get_boolean(env, is_date, &result));
+
+  return result;
+}
+
+static napi_value getDateValue(napi_env env, napi_callback_info info) {
+  napi_value date, result;
+  size_t argc = 1;
+  double value;
+
+  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, &date, NULL, NULL));
+  NAPI_CALL(env, napi_get_date_value(env, date, &value));
+  NAPI_CALL(env, napi_create_double(env, value, &result));
+
+  return result;
+}
+
+EXTERN_C_START
+napi_value Init(napi_env env, napi_value exports) {
+  napi_property_descriptor descriptors[] = {
+    DECLARE_NAPI_PROPERTY("createDate", createDate),
+    DECLARE_NAPI_PROPERTY("isDate", isDate),
+    DECLARE_NAPI_PROPERTY("getDateValue", getDateValue),
+  };
+
+  NAPI_CALL(env, napi_define_properties(
+      env, exports, sizeof(descriptors) / sizeof(*descriptors), descriptors));
+
+  return exports;
+}
+EXTERN_C_END