117 lines
3.8 KiB
Java
117 lines
3.8 KiB
Java
/*
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* Copyright (c) 2013, 2015, 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 8024415
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* @summary Pretty printing of JCConditional does not follow the precedence and
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* associativity rules of JCConditional
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* @modules jdk.compiler/com.sun.tools.javac.file
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* jdk.compiler/com.sun.tools.javac.tree
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* jdk.compiler/com.sun.tools.javac.util
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* @run testng T8024415
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*/
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import static org.testng.Assert.assertEquals;
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import java.io.IOException;
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import java.io.StringWriter;
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import org.testng.annotations.Test;
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import com.sun.tools.javac.file.JavacFileManager;
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import com.sun.tools.javac.tree.JCTree;
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import com.sun.tools.javac.tree.JCTree.JCExpression;
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import com.sun.tools.javac.tree.Pretty;
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import com.sun.tools.javac.tree.TreeMaker;
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import com.sun.tools.javac.util.Context;
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import com.sun.tools.javac.util.Names;
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/*
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* Test verifies that the precedence rules of conditional expressions
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* (JCConditional) are correct.
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*/
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@Test
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public class T8024415 {
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TreeMaker maker;
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JCExpression x;
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public T8024415() {
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Context ctx = new Context();
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JavacFileManager.preRegister(ctx);
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maker = TreeMaker.instance(ctx);
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Names names = Names.instance(ctx);
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x = maker.Ident(names.fromString("x"));
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}
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// JLS 15.25: The conditional operator is syntactically right-associative
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// (it groups right-to-left). Thus, a?b:c?d:e?f:g means the same as
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// a?b:(c?d:(e?f:g)).
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public void testAssociativity() throws IOException {
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JCTree left = maker.Conditional(maker.Conditional(x, x, x), x, x);
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JCTree right = maker.Conditional(x, x, maker.Conditional(x, x, x));
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String prettyLeft = prettyPrint(left);
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String prettyRight = prettyPrint(right);
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assertEquals(prettyLeft.replaceAll("\\s", ""), "(x?x:x)?x:x");
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assertEquals(prettyRight.replaceAll("\\s", ""), "x?x:x?x:x");
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}
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// The true-part of a conditional expression is surrounded by ? and :
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// and can thus always be parsed unambiguously without surrounding
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// parentheses.
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public void testPrecedence() throws IOException {
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JCTree left = maker.Conditional(maker.Assign(x, x), x, x);
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JCTree middle = maker.Conditional(x, maker.Assign(x, x), x);
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JCTree right = maker.Conditional(x, x, maker.Assign(x, x));
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String prettyLeft = prettyPrint(left);
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String prettyMiddle = prettyPrint(middle);
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String prettyRight = prettyPrint(right);
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assertEquals(prettyLeft.replaceAll("\\s", ""), "(x=x)?x:x");
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assertEquals(prettyMiddle.replaceAll("\\s", ""), "x?x=x:x");
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assertEquals(prettyRight.replaceAll("\\s", ""), "x?x:(x=x)");
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}
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// Helper method
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private static String prettyPrint(JCTree tree) throws IOException {
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StringWriter sw = new StringWriter();
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new Pretty(sw, true).printExpr(tree);
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return sw.toString();
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}
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}
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