129 lines
4.7 KiB
Java
129 lines
4.7 KiB
Java
/*
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* Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8206986
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* @summary Ensure SimpleTreeVisitor.visitSwitchExpression behaves as it should
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* @modules jdk.compiler
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*/
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import java.io.IOException;
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import java.io.StringWriter;
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import java.net.URI;
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import java.util.Arrays;
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import java.util.List;
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import javax.tools.*;
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import com.sun.source.tree.CompilationUnitTree;
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import com.sun.source.tree.SwitchExpressionTree;
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import com.sun.source.tree.YieldTree;
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import com.sun.source.tree.Tree;
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import com.sun.source.util.JavacTask;
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import com.sun.source.util.SimpleTreeVisitor;
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import com.sun.source.util.TreePathScanner;
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public class SwitchExpressionSimpleVisitorTest {
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public static void main(String[] args) throws Exception {
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new SwitchExpressionSimpleVisitorTest().run();
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}
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void run() throws Exception {
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String code = "class Test {\n" +
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" int t(int i) {\n" +
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" return switch(i) {\n" +
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" default: yield -1;\n" +
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" }\n" +
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" }\n" +
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"}\n";
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int[] callCount = new int[1];
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int[] switchExprNodeCount = new int[1];
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int[] yieldNodeCount = new int[1];
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new TreePathScanner<Void, Void>() {
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@Override
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public Void visitSwitchExpression(SwitchExpressionTree node, Void p) {
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node.accept(new SimpleTreeVisitor<Void, Void>() {
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@Override
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protected Void defaultAction(Tree defaultActionNode, Void p) {
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callCount[0]++;
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if (node == defaultActionNode) {
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switchExprNodeCount[0]++;
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}
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return null;
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}
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}, null);
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return super.visitSwitchExpression(node, p);
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}
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@Override
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public Void visitYield(YieldTree node, Void p) {
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node.accept(new SimpleTreeVisitor<Void, Void>() {
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@Override
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protected Void defaultAction(Tree defaultActionNode, Void p) {
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callCount[0]++;
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if (node == defaultActionNode) {
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yieldNodeCount[0]++;
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}
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return null;
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}
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}, null);
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return super.visitYield(node, p);
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}
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}.scan(parse(code), null);
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if (callCount[0] != 2 || switchExprNodeCount[0] != 1 ||
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yieldNodeCount[0] != 1) {
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throw new AssertionError("Unexpected counts; callCount=" + callCount[0] +
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", switchExprNodeCount=" + switchExprNodeCount[0] +
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", yieldNodeCount=" + yieldNodeCount[0]);
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}
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}
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private CompilationUnitTree parse(String code) throws IOException {
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final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
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assert tool != null;
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DiagnosticListener<JavaFileObject> noErrors = d -> {};
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StringWriter out = new StringWriter();
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JavacTask ct = (JavacTask) tool.getTask(out, null, noErrors,
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List.of(), null,
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Arrays.asList(new MyFileObject(code)));
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return ct.parse().iterator().next();
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}
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static class MyFileObject extends SimpleJavaFileObject {
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private String text;
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public MyFileObject(String text) {
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super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
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this.text = text;
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}
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@Override
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public CharSequence getCharContent(boolean ignoreEncodingErrors) {
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return text;
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}
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}
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}
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