Update NativeArray for toReversed()

Author: pkkht

src/org/mozilla/javascript/NativeArray.java

@@ -154,6 +154,7 @@ protected void fillConstructorProperties(IdFunctionObject ctor) {
         addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_isArray, "isArray", 1);
         addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_of, "of", 0);
         addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_from, "from", 1);
+        addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_toReversed, "toReversed", 0);
         super.fillConstructorProperties(ctor);
     }
 
@@ -303,6 +304,10 @@ protected void initPrototypeId(int id) {
                 arity = 1;
                 s = "flatMap";
                 break;
+            case Id_toReversed:
+                arity = 0;
+                s = "toReversed";
+                break;
             default:
                 throw new IllegalArgumentException(String.valueOf(id));
         }
@@ -341,7 +346,8 @@ public Object execIdCall(
                 case ConstructorId_findIndex:
                 case ConstructorId_reduce:
                 case ConstructorId_reduceRight:
-                    {
+                case ConstructorId_toReversed:
+                {
                         // this is a small trick; we will handle all the ConstructorId_xxx calls
                         // the same way the object calls are processed
                         // so we adjust the args, inverting the id and
@@ -448,6 +454,9 @@ public Object execIdCall(
                 case Id_flatMap:
                     return js_flatMap(cx, scope, thisObj, args);
 
+                case Id_toReversed:
+                    return js_toReversed(cx, scope, thisObj, args);
+
                 case Id_every:
                 case Id_filter:
                 case Id_forEach:
@@ -2252,6 +2261,19 @@ private static boolean js_isArray(Object o) {
         return "Array".equals(((Scriptable) o).getClassName());
     }
 
+    private static Scriptable js_toReversed(
+            Context cx, Scriptable scope, Scriptable thisObj, Object[] args) {
+        Scriptable o = ScriptRuntime.toObject(cx, scope, thisObj);
+        int len = (getLengthProperty(cx, o) > Integer.MAX_VALUE) ? 0 :(int) getLengthProperty(cx, o);
+
+        Scriptable result = cx.newArray(scope, len);
+
+        for(int k = len-1; k >= 0; k--){
+            Object temp1 = getRawElem(o, k);
+            setRawElem(cx, result, k, temp1);
+        }
+        return result;
+    }
     // methods to implement java.util.List
 
     @Override
@@ -2688,6 +2710,9 @@ protected int findPrototypeId(String s) {
             case "flatMap":
                 id = Id_flatMap;
                 break;
+            case "toReversed":
+                id = Id_toReversed;
+                break;
             default:
                 id = 0;
                 break;
@@ -2730,6 +2755,7 @@ protected int findPrototypeId(String s) {
             Id_flat = 33,
             Id_flatMap = 34,
             SymbolId_iterator = 35,
+            Id_toReversed =36,
             MAX_PROTOTYPE_ID = SymbolId_iterator;
     private static final int ConstructorId_join = -Id_join,
             ConstructorId_reverse = -Id_reverse,
@@ -2752,6 +2778,7 @@ protected int findPrototypeId(String s) {
             ConstructorId_findIndex = -Id_findIndex,
             ConstructorId_reduce = -Id_reduce,
             ConstructorId_reduceRight = -Id_reduceRight,
+            ConstructorId_toReversed = -Id_toReversed,
             ConstructorId_isArray = -26,
             ConstructorId_of = -27,
             ConstructorId_from = -28;