Implement ES5 Array.isArray

Patch by Jan de Mooij <jandemooij@gmail.com>
Review at http://codereview.chromium.org/271072


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3060 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/array.js

@@ -1058,6 +1058,10 @@ function ArrayReduceRight(callback, current) {
   return current;
 }
 
+// ES5, 15.4.3.2
+function ArrayIsArray(obj) {
+  return IS_ARRAY(obj);
+}
 
 // -------------------------------------------------------------------
 
@@ -1075,6 +1079,11 @@ function SetupArray() {
   // object.
   %SetProperty($Array.prototype, "constructor", $Array, DONT_ENUM);
 
+  // Setup non-enumerable functions on the Array object.
+  InstallFunctions($Array, DONT_ENUM, $Array(
+    "isArray", ArrayIsArray
+  ));
+
   // Setup non-enumerable functions of the Array.prototype object and
   // set their names.
   InstallFunctionsOnHiddenPrototype($Array.prototype, DONT_ENUM, $Array(
@@ -1098,8 +1107,9 @@ function SetupArray() {
     "indexOf", ArrayIndexOf,
     "lastIndexOf", ArrayLastIndexOf,
     "reduce", ArrayReduce,
-    "reduceRight", ArrayReduceRight));
-
+    "reduceRight", ArrayReduceRight
+  ));
+    
   // Manipulate the length of some of the functions to meet
   // expectations set by ECMA-262 or Mozilla.
   UpdateFunctionLengths({

test/mjsunit/third_party/array-isarray.js

+// Copyright (c) 2009 Apple Computer, Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//
+// 1. Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+//
+// 3. Neither the name of the copyright holder(s) nor the names of any
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+// OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Based on LayoutTests/fast/js/resources/Array-isArray.js
+
+assertTrue(Array.isArray([]));
+assertTrue(Array.isArray(new Array));
+assertTrue(Array.isArray(Array()));
+assertTrue(Array.isArray('abc'.match(/(a)*/g)));
+assertFalse((function(){ return Array.isArray(arguments); })());
+assertFalse(Array.isArray());
+assertFalse(Array.isArray(null));
+assertFalse(Array.isArray(undefined));
+assertFalse(Array.isArray(true));
+assertFalse(Array.isArray(false));
+assertFalse(Array.isArray('a string'));
+assertFalse(Array.isArray({}));
+assertFalse(Array.isArray({length: 5}));
+assertFalse(Array.isArray({__proto__: Array.prototype, length:1, 0:1, 1:2}));
+