1 /*
   2  * Copyright (c) 2011, 2017, 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 8187982 8187951
  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         if (SourceVersion.latest() != RELEASE_10 ||
  50             SourceVersion.latestSupported() != RELEASE_10)
  51             throw new RuntimeException("Unexpected release value(s) found:\n" +
  52                                        "latest:\t" + SourceVersion.latest() + "\n" +
  53                                        "latestSupported:\t" + SourceVersion.latestSupported());
  54     }
  55 
  56     private static void testVersionVaryingKeywords() {
  57         Map<String, SourceVersion> keyWordStart =
  58             Map.of("strictfp", RELEASE_2,
  59                    "assert",   RELEASE_4,
  60                    "enum",     RELEASE_5,
  61                    "_",        RELEASE_9);
  62 
  63         for (Map.Entry<String, SourceVersion> entry : keyWordStart.entrySet()) {
  64             String key = entry.getKey();
  65             SourceVersion value = entry.getValue();
  66 
  67             check(true, isKeyword(key), "keyword", latest());
  68             check(false, isName(key),   "name",    latest());
  69 
  70             for(SourceVersion version : SourceVersion.values()) {
  71                 boolean isKeyword = version.compareTo(value) >= 0;
  72 
  73                 check(isKeyword,  isKeyword(key, version), "keyword", version);
  74                 check(!isKeyword, isName(key, version),    "name",    version);
  75             }
  76         }
  77     }
  78 
  79     private static void testRestrictedKeywords() {
  80         // Restricted keywords are not full keywords
  81 
  82         /*
  83          * JLS 3.9
  84          * " A further ten character sequences are restricted
  85          * keywords: open, module, requires, transitive, exports,
  86          * opens, to, uses, provides, and with"
  87          */
  88         Set<String> restrictedKeywords =
  89             Set.of("open", "module", "requires", "transitive", "exports",
  90                    "opens", "to", "uses", "provides", "with");
  91 
  92         for(String key : restrictedKeywords) {
  93             for(SourceVersion version : SourceVersion.values()) {
  94                 check(false, isKeyword(key, version), "keyword", version);
  95                 check(true,  isName(key, version),    "name",    version);
  96             }
  97         }
  98     }
  99 
 100     private static void testVar() {
 101 
 102         for(SourceVersion version : SourceVersion.values()) {
 103             check(false, isKeyword("var",     version), "keyword", version);
 104             check(false, isKeyword("foo.var", version), "keyword", version);
 105             check(false, isKeyword("var.foo", version), "keyword", version);
 106 
 107             // The string "var" doesn't have special handling until release 10.
 108             boolean lessThan10 = version.compareTo(RELEASE_10) < 0;
 109             check(lessThan10, isName("var", version),     "name", version);
 110             check(lessThan10, isName("foo.var", version), "name", version);
 111             check(true,       isName("var.foo", version), "name", version);
 112         }
 113     }
 114 
 115     private static void check(boolean result, boolean expected,
 116                               String message, SourceVersion version) {
 117         if (result != expected) {
 118             throw new RuntimeException("Unexpected " + message +  "-ness of _ on " + version);
 119         }
 120     }
 121 }