1 /* 2 * Copyright (c) 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 8206986 27 * @summary Ensure rule cases can be parsed correctly for complex expressions. 28 * @modules jdk.compiler 29 */ 30 31 import java.io.StringWriter; 32 import java.net.URI; 33 import java.util.AbstractMap.SimpleEntry; 34 import java.util.ArrayList; 35 import java.util.Arrays; 36 import java.util.List; 37 import java.util.Locale; 38 import java.util.Map.Entry; 39 40 import javax.tools.*; 41 42 import com.sun.source.tree.CaseTree; 43 import com.sun.source.tree.CompilationUnitTree; 44 import com.sun.source.util.JavacTask; 45 import com.sun.source.util.TreePathScanner; 46 import com.sun.source.util.Trees; 47 48 public class RuleParsingTest { 49 50 public static void main(String[] args) throws Exception { 51 new RuleParsingTest().testParseComplexExpressions(); 52 } 53 54 void testParseComplexExpressions() throws Exception { 55 String[] expressions = { 56 "(a)", 57 "a", 58 "a + a", 59 "~a + a", 60 "a = a", 61 "a += a", 62 "a + (a)", 63 "a + (a) b", 64 "true ? a : b", 65 "m(() -> {})", 66 "m(() -> 1)", 67 "m(a -> 1)", 68 "m((t a) -> 1)", 69 }; 70 StringBuilder code = new StringBuilder(); 71 List<Entry<Long, Long>> spans = new ArrayList<>(); 72 code.append("class Test {\n" + 73 " void t(int i) {\n"); 74 for (boolean switchExpr : new boolean[] {false, true}) { 75 if (switchExpr) { 76 code.append(" int j = switch(i) {\n"); 77 } else { 78 code.append(" switch(i) {\n"); 79 } 80 for (String expr : expressions) { 81 code.append("case "); 82 int start = code.length(); 83 code.append(expr); 84 spans.add(new SimpleEntry<>((long) start, (long) code.length())); 85 code.append(" -> {}"); 86 } 87 code.append(" };\n"); 88 } 89 code.append(" }\n" + 90 "}\n"); 91 final JavaCompiler tool = ToolProvider.getSystemJavaCompiler(); 92 assert tool != null; 93 DiagnosticListener<JavaFileObject> noErrors = d -> { throw new AssertionError(d.getMessage(null)); }; 94 95 StringWriter out = new StringWriter(); 96 JavacTask ct = (JavacTask) tool.getTask(out, null, noErrors, 97 List.of("--enable-preview", "-source", "12"), null, 98 Arrays.asList(new MyFileObject(code.toString()))); 99 CompilationUnitTree cut = ct.parse().iterator().next(); 100 Trees trees = Trees.instance(ct); 101 new TreePathScanner<Void, Void>() { 102 @Override 103 public Void visitCase(CaseTree node, Void p) { 104 long start = trees.getSourcePositions().getStartPosition(cut, node.getExpression()); 105 long end = trees.getSourcePositions().getEndPosition(cut, node.getExpression()); 106 if (!spans.remove(new SimpleEntry<>(start, end))) { 107 throw new AssertionError("Did not find an expression span in expected spans: " + 108 start + "-" + end + 109 " '" + node.getExpression().toString() + "'"); 110 } 111 return super.visitCase(node, p); 112 } 113 }.scan(cut, null); 114 115 if (!spans.isEmpty()) { 116 throw new AssertionError("Remaning spans: " + spans); 117 } 118 } 119 120 static class MyFileObject extends SimpleJavaFileObject { 121 private String text; 122 123 public MyFileObject(String text) { 124 super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE); 125 this.text = text; 126 } 127 128 @Override 129 public CharSequence getCharContent(boolean ignoreEncodingErrors) { 130 return text; 131 } 132 } 133 }