1 /*
   2  * Copyright (c) 2011, 2018, 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  * @test
  26  * @bug 7025809 8028543 6415644 8028544 8029942 8187951 8193291 8196551
  27  * @summary Test latest, latestSupported, underscore as keyword, etc.
  28  * @author  Joseph D. Darcy
  29  * @modules java.compiler
  30  *          jdk.compiler
  31  */
  32 
  33 import java.util.*;
  34 import javax.lang.model.SourceVersion;
  35 import static javax.lang.model.SourceVersion.*;
  36 
  37 /**
  38  * Verify latest[Supported] behavior.
  39  */
  40 public class TestSourceVersion {
  41     public static void main(String... args) {
  42         testLatestSupported();
  43         testVersionVaryingKeywords();
  44         testRestrictedKeywords();
  45         testVar();
  46     }
  47 
  48     private static void testLatestSupported() {
  49         SourceVersion[] values = SourceVersion.values();
  50         SourceVersion last = values[values.length - 1];
  51         SourceVersion latest = SourceVersion.latest();
  52         SourceVersion latestSupported = SourceVersion.latestSupported();
  53 
  54         if (latest == last &&
  55             latestSupported == SourceVersion.valueOf("RELEASE_" + Runtime.version().feature()) &&
  56             (latest == latestSupported || (latest.ordinal() - latestSupported.ordinal() == 1)) )
  57             return;
  58         else {
  59             throw new RuntimeException("Unexpected release value(s) found:\n" +
  60                                        "latest:\t" + latest + "\n" +
  61                                        "latestSupported:\t" + latestSupported);
  62         }
  63     }
  64 
  65     private static void testVersionVaryingKeywords() {
  66         Map<String, SourceVersion> keyWordStart =
  67             Map.of("strictfp", RELEASE_2,
  68                    "assert",   RELEASE_4,
  69                    "enum",     RELEASE_5,
  70                    "_",        RELEASE_9);
  71 
  72         for (Map.Entry<String, SourceVersion> entry : keyWordStart.entrySet()) {
  73             String key = entry.getKey();
  74             SourceVersion value = entry.getValue();
  75 
  76             check(true, isKeyword(key), "keyword", latest());
  77             check(false, isName(key),   "name",    latest());
  78 
  79             for(SourceVersion version : SourceVersion.values()) {
  80                 boolean isKeyword = version.compareTo(value) >= 0;
  81 
  82                 check(isKeyword,  isKeyword(key, version), "keyword", version);
  83                 check(!isKeyword, isName(key, version),    "name",    version);
  84             }
  85         }
  86     }
  87 
  88     private static void testRestrictedKeywords() {
  89         // Restricted keywords are not full keywords
  90 
  91         /*
  92          * JLS 3.9
  93          * " A further ten character sequences are restricted
  94          * keywords: open, module, requires, transitive, exports,
  95          * opens, to, uses, provides, and with"
  96          */
  97         Set<String> restrictedKeywords =
  98             Set.of("open", "module", "requires", "transitive", "exports",
  99                    "opens", "to", "uses", "provides", "with",
 100                    // Assume "record" and "sealed" will be restricted keywords.
 101                    "record", "sealed");
 102 
 103         for(String key : restrictedKeywords) {
 104             for(SourceVersion version : SourceVersion.values()) {
 105                 check(false, isKeyword(key, version), "keyword", version);
 106                 check(true,  isName(key, version),    "name",    version);
 107             }
 108         }
 109     }
 110 
 111     private static void testVar() {
 112 
 113         for(SourceVersion version : SourceVersion.values()) {
 114             check(false, isKeyword("var",     version), "keyword", version);
 115             check(false, isKeyword("foo.var", version), "keyword", version);
 116             check(false, isKeyword("var.foo", version), "keyword", version);
 117 
 118             check(true, isName("var", version),     "name", version);
 119             check(true, isName("foo.var", version), "name", version);
 120             check(true, isName("var.foo", version), "name", version);
 121         }
 122     }
 123 
 124     private static void check(boolean result, boolean expected,
 125                               String message, SourceVersion version) {
 126         if (result != expected) {
 127             throw new RuntimeException("Unexpected " + message +  "-ness of _ on " + version);
 128         }
 129     }
 130 }