author | lana |
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changeset 35340 | 38f7386ed942 |
parent 30730 | d3ce7619db2c |
permissions | -rw-r--r-- |
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/* |
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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 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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} |