1 /*

     2  * Copyright (c) 2018, 2019, 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 8231827

    27  * @summary Ensure SimpleTreeVisitor.visitBindingPattern and visitInstanceOf behaves as it should

    28  * @modules jdk.compiler

    29  */

    30 

    31 import java.io.IOException;

    32 import java.io.StringWriter;

    33 import java.net.URI;

    34 import java.util.Arrays;

    35 import java.util.List;

    36 

    37 import javax.tools.*;

    38 

    39 import com.sun.source.tree.BindingPatternTree;

    40 import com.sun.source.tree.CompilationUnitTree;

    41 import com.sun.source.tree.InstanceOfTree;

    42 import com.sun.source.tree.Tree;

    43 import com.sun.source.util.JavacTask;

    44 import com.sun.source.util.SimpleTreeVisitor;

    45 import com.sun.source.util.TreePathScanner;

    46 

    47 public class PatternsSimpleVisitorTest {

    48 

    49     public static void main(String[] args) throws Exception {

    50         new PatternsSimpleVisitorTest().run();

    51     }

    52 

    53     void run() throws Exception {

    54         String code = "class Test {\n" +

    55                       "    boolean t(Object o) {\n" +

    56                       "         return o instanceof String s ? s.isEmpty() : false;\n" +

    57                       "    }\n" +

    58                       "}\n";

    59         int[] callCount = new int[1];

    60         int[] instanceOfNodeCount = new int[1];

    61         int[] bindingPatternNodeCount = new int[1];

    62         new TreePathScanner<Void, Void>() {

    63             @Override

    64             public Void visitInstanceOf(InstanceOfTree node, Void p) {

    65                 node.accept(new SimpleTreeVisitor<Void, Void>() {

    66                     @Override

    67                     protected Void defaultAction(Tree defaultActionNode, Void p) {

    68                         callCount[0]++;

    69                         if (node == defaultActionNode) {

    70                             instanceOfNodeCount[0]++;

    71                         }

    72                         return null;

    73                     }

    74                 }, null);

    75                 return super.visitInstanceOf(node, p);

    76             }

    77             @Override

    78             public Void visitBindingPattern(BindingPatternTree node, Void p) {

    79                 node.accept(new SimpleTreeVisitor<Void, Void>() {

    80                     @Override

    81                     protected Void defaultAction(Tree defaultActionNode, Void p) {

    82                         callCount[0]++;

    83                         if (node == defaultActionNode) {

    84                             bindingPatternNodeCount[0]++;

    85                         }

    86                         return null;

    87                     }

    88                 }, null);

    89                 return super.visitBindingPattern(node, p);

    90             }

    91         }.scan(parse(code), null);

    92 

    93         if (callCount[0] != 2 || instanceOfNodeCount[0] != 1 ||

    94             bindingPatternNodeCount[0] != 1) {

    95             throw new AssertionError("Unexpected counts; callCount=" + callCount[0] +

    96                                      ", switchExprNodeCount=" + instanceOfNodeCount[0] +

    97                                      ", yieldNodeCount=" + bindingPatternNodeCount[0]);

    98         }

    99     }

   100 

   101     private CompilationUnitTree parse(String code) throws IOException {

   102         final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();

   103         assert tool != null;

   104         DiagnosticListener<JavaFileObject> noErrors = d -> {};

   105 

   106         StringWriter out = new StringWriter();

   107         JavacTask ct = (JavacTask) tool.getTask(out, null, noErrors,

   108             List.of("--enable-preview", "-source", Integer.toString(Runtime.version().feature())), null,

   109             Arrays.asList(new MyFileObject(code)));

   110         return ct.parse().iterator().next();

   111     }

   112 

   113     static class MyFileObject extends SimpleJavaFileObject {

   114         private String text;

   115 

   116         public MyFileObject(String text) {

   117             super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);

   118             this.text = text;

   119         }

   120 

   121         @Override

   122         public CharSequence getCharContent(boolean ignoreEncodingErrors) {

   123             return text;

   124         }

   125     }

   126 }