Implement Array.prototype.toString

JerryScript-DCO-1.0-Signed-off-by: Peter Gal pgal.u-szeged@partner.samsung.com

tests/jerry/array_prototype_tostring.js

@@ -0,0 +1,64 @@
+// Copyright 2015 Samsung Electronics Co., Ltd.
+// Copyright 2015 University of Szeged.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Our own join method if the internal join is not implemented.
+function join(sep)
+{
+  sep = sep ? sep : ",";
+  var result = "";
+
+  for (var i = 0; i < this.length; ++i) {
+    result += this[i];
+    if (i + 1 < this.length) {
+      result += sep;
+    }
+  }
+
+  return result;
+}
+
+// Force fallback to object.prototype.toString()
+Array.prototype.join = 1;
+
+assert ([1].toString() === "[object Array]");
+
+Array.prototype.join = join;
+
+assert ([1, 2].toString() === "1,2");
+
+var test = [1,2,3];
+test.join = function() { throw ReferenceError ("foo"); };
+
+try {
+  test.toString();
+
+  assert (false);
+} catch (e) {
+  assert (e.message === "foo");
+  assert (e instanceof ReferenceError);
+}
+
+
+// Test if the join returns a ReferenceError
+var arr = [1,2]
+Object.defineProperty(arr, 'join', { 'get' : function () {throw new ReferenceError ("foo"); } });
+try {
+  arr.toString();
+
+  assert (false);
+} catch (e) {
+  assert (e.message === "foo");
+  assert (e instanceof ReferenceError);
+}