convert Temporal.PlainDate asDate(), and test

Author: wirthi

graal-js/src/com.oracle.truffle.js.test/src/com/oracle/truffle/js/test/interop/TemporalInteropToJavaTest.java

@@ -111,10 +111,18 @@ public void testInstant() {
     // public void testDuration() {
     // }
 
-    // TODO
-    // @Test
-    // public void testPlainDate() {
-    // }
+    @Test
+    public void testPlainDate() {
+        try (Context ctx = getJSContext()) {
+            Value val = ctx.eval(ID, "new Temporal.PlainDate(1982, 11, 26);");
+            LocalDate ld = val.asDate();
+            Assert.assertEquals(1982, ld.getYear());
+            Assert.assertEquals(Month.NOVEMBER, ld.getMonth());
+            Assert.assertEquals(26, ld.getDayOfMonth());
+
+            Assert.assertFalse(val.isTime());
+            Assert.assertFalse(val.isTimeZone());
+        }}
 
     @Test
     public void testPlainTime() {

graal-js/src/com.oracle.truffle.js/src/com/oracle/truffle/js/runtime/builtins/temporal/JSTemporalPlainDateObject.java

@@ -40,10 +40,17 @@
  */
 package com.oracle.truffle.js.runtime.builtins.temporal;
 
+import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
+import com.oracle.truffle.api.interop.InteropLibrary;
+import com.oracle.truffle.api.library.ExportLibrary;
+import com.oracle.truffle.api.library.ExportMessage;
 import com.oracle.truffle.api.object.Shape;
 import com.oracle.truffle.js.runtime.objects.JSDynamicObject;
 import com.oracle.truffle.js.runtime.objects.JSNonProxyObject;
 
+import java.time.LocalDate;
+
+@ExportLibrary(InteropLibrary.class)
 public class JSTemporalPlainDateObject extends JSNonProxyObject implements TemporalMonth, TemporalYear, TemporalDay, TemporalCalendar {
 
     private final int year;
@@ -78,4 +85,17 @@ public int getDay() {
     public JSDynamicObject getCalendar() {
         return calendar;
     }
+
+    @ExportMessage
+    @SuppressWarnings("static-method")
+    final boolean isDate() {
+        return true;
+    }
+
+    @ExportMessage
+    @TruffleBoundary
+    final LocalDate asDate() {
+        LocalDate ld = LocalDate.of(year, month, day);
+        return ld;
+    }
 }

graal-js/src/com.oracle.truffle.js/src/com/oracle/truffle/js/runtime/builtins/temporal/JSTemporalPlainDateTimeObject.java

@@ -148,6 +148,7 @@ final boolean isDate() {
     }
 
     @ExportMessage
+    @TruffleBoundary
     final LocalDate asDate() {
         LocalDate ld = LocalDate.of(year, month, day);
         return ld;