1 /*
   2  * Copyright (c) 2010, 2013, 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);