8025147: Trailing comma is not allowed in JSONArray and JSONObject

Reviewed-by: hannesw, jlaskey

nashorn/src/jdk/nashorn/internal/parser/JSONParser.java

@@ -349,6 +349,10 @@ loop:
 
             case COMMARIGHT:
                 next();
+                // check for trailing comma - not allowed in JSON
+                if (type == RBRACKET) {
+                    throw error(AbstractParser.message("trailing.comma.in.json", type.getNameOrType()));
+                }
                 break;
 
             default:
@@ -388,6 +392,10 @@ loop:
 
             case COMMARIGHT:
                 next();
+                // check for trailing comma - not allowed in JSON
+                if (type == RBRACE) {
+                    throw error(AbstractParser.message("trailing.comma.in.json", type.getNameOrType()));
+                }
                 break;
 
             default:

nashorn/src/jdk/nashorn/internal/runtime/resources/Messages.properties

@@ -57,6 +57,7 @@ parser.error.missing.catch.or.finally=Missing catch or finally after try
 parser.error.regex.unsupported.flag=Unsupported RegExp flag: {0}
 parser.error.regex.repeated.flag=Repeated RegExp flag: {0}
 parser.error.regex.syntax={0}
+parser.error.trailing.comma.in.json=Trailing comma is not allowed in JSON
 
 # strict mode error messages
 parser.error.strict.no.with="with" statement cannot be used in strict mode

nashorn/test/script/basic/JDK-8025147.js

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * 
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ * 
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ * 
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * JDK-8025147: Trailing comma is not allowed in JSONArray and JSONObject
+ *
+ * @test
+ * @run
+ */
+
+function check(str) {
+    try {
+        JSON.parse(str);
+        fail("should have thrown SyntaxError for " + str);
+    } catch (e) {
+        print(e);
+    }
+}
+
+check("{ \"a\": 333, }");
+check("[ 4343, ]");

nashorn/test/script/basic/JDK-8025147.js.EXPECTED

@@ -0,0 +1,6 @@
+SyntaxError: Invalid JSON: <json>:1:12 Trailing comma is not allowed in JSON
+{ "a": 333, }
+            ^
+SyntaxError: Invalid JSON: <json>:1:8 Trailing comma is not allowed in JSON
+[ 4343, ]
+        ^