1 /*

     2  * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  * 

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  * 

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  * 

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  * 

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 /*

    25  * NASHORN-759 - Efficient string concatenation with + operator

    26  *

    27  * @test

    28  * @run

    29  */

    30 

    31 // Check invalidation of callsite for non-string CharSequence

    32 function checkProps(s) {

    33     print(typeof s);

    34     print(typeof s.length);

    35     print(s.charCodeAt === String.prototype.charCodeAt);

    36     print();

    37 }

    38 

    39 var s1 = "foo";

    40 var s2 = "bar";

    41 var s3 = s1 + s2 + s1 + s2;

    42 var s4 = new java.lang.StringBuilder("abc");

    43 checkProps(s1);

    44 checkProps(s2);

    45 checkProps(s3);

    46 checkProps(s4);

    47 

    48 // Rebuild string and compare to original

    49 function rebuildString(s) {

    50     var buf = s.split("");

    51     print(buf);

    52     while (buf.length > 1) {

    53         var result = [];

    54         buf.reduce(function(previous, current, index) {

    55             if (previous) {

    56                 result.push(previous + current);

    57                 return null;

    58             } else if (index === buf.length - 1) {

    59                 result.push(current);

    60                 return null;

    61             } else {

    62                 return current;

    63             }

    64         });

    65         buf = result;

    66         print(buf);

    67     }

    68     return buf[0];

    69 }

    70 

    71 var n1 = "The quick gray nashorn jumps over the lazy zebra.";

    72 var n2 = rebuildString(n1);

    73 print(n1, n2, n2.length, n1 == n2, n1 === n2, n1 < n2, n1 <= n2, n1 > n2, n1 >= n2);

    74 checkProps(n2);

    75 

    76 var n3 = rebuildString(rebuildString(n2));

    77 print(n3, n3.length, n1 == n3, n2 == n3, n1 === n3, n2 === n3);

    78 checkProps(n3);