aoqi@0: /*
aoqi@0:  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: /*
aoqi@0:  * @test
aoqi@0:  * @bug 8024415
aoqi@0:  * @summary Pretty printing of JCConditional does not follow the precedence and
aoqi@0:  *          associativity rules of JCConditional
aoqi@0:  * @run testng T8024415
aoqi@0:  */
aoqi@0: 
aoqi@0: 
aoqi@0: import static org.testng.Assert.assertEquals;
aoqi@0: 
aoqi@0: import java.io.IOException;
aoqi@0: import java.io.StringWriter;
aoqi@0: 
aoqi@0: import org.testng.annotations.Test;
aoqi@0: 
aoqi@0: import com.sun.tools.javac.file.JavacFileManager;
aoqi@0: import com.sun.tools.javac.tree.JCTree;
aoqi@0: import com.sun.tools.javac.tree.JCTree.JCExpression;
aoqi@0: import com.sun.tools.javac.tree.Pretty;
aoqi@0: import com.sun.tools.javac.tree.TreeMaker;
aoqi@0: import com.sun.tools.javac.util.Context;
aoqi@0: import com.sun.tools.javac.util.Names;
aoqi@0: 
aoqi@0: 
aoqi@0: /*
aoqi@0:  * Test verifies that the precedence rules of conditional expressions
aoqi@0:  * (JCConditional) are correct.
aoqi@0:  */
aoqi@0: @Test
aoqi@0: public class T8024415 {
aoqi@0: 
aoqi@0:     TreeMaker maker;
aoqi@0:     JCExpression x;
aoqi@0: 
aoqi@0: 
aoqi@0:     public T8024415() {
aoqi@0:         Context ctx = new Context();
aoqi@0:         JavacFileManager.preRegister(ctx);
aoqi@0:         maker = TreeMaker.instance(ctx);
aoqi@0:         Names names = Names.instance(ctx);
aoqi@0:         x = maker.Ident(names.fromString("x"));
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0:     // JLS 15.25: The conditional operator is syntactically right-associative
aoqi@0:     // (it groups right-to-left). Thus, a?b:c?d:e?f:g means the same as
aoqi@0:     // a?b:(c?d:(e?f:g)).
aoqi@0:     public void testAssociativity() throws IOException {
aoqi@0: 
aoqi@0:         JCTree left   = maker.Conditional(maker.Conditional(x, x, x), x, x);
aoqi@0:         JCTree right  = maker.Conditional(x, x, maker.Conditional(x, x, x));
aoqi@0: 
aoqi@0:         String prettyLeft   = prettyPrint(left);
aoqi@0:         String prettyRight  = prettyPrint(right);
aoqi@0: 
aoqi@0:         assertEquals(prettyLeft.replaceAll("\\s", ""),  "(x?x:x)?x:x");
aoqi@0:         assertEquals(prettyRight.replaceAll("\\s", ""), "x?x:x?x:x");
aoqi@0: 
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0:     // The true-part of of a conditional expression is surrounded by ? and :
aoqi@0:     // and can thus always be parsed unambiguously without surrounding
aoqi@0:     // parentheses.
aoqi@0:     public void testPrecedence() throws IOException {
aoqi@0: 
aoqi@0:         JCTree left   = maker.Conditional(maker.Assign(x, x), x, x);
aoqi@0:         JCTree middle = maker.Conditional(x, maker.Assign(x, x), x);
aoqi@0:         JCTree right  = maker.Conditional(x, x, maker.Assign(x, x));
aoqi@0: 
aoqi@0:         String prettyLeft   = prettyPrint(left);
aoqi@0:         String prettyMiddle = prettyPrint(middle);
aoqi@0:         String prettyRight  = prettyPrint(right);
aoqi@0: 
aoqi@0:         assertEquals(prettyLeft.replaceAll("\\s", ""),   "(x=x)?x:x");
aoqi@0:         assertEquals(prettyMiddle.replaceAll("\\s", ""), "x?x=x:x");
aoqi@0:         assertEquals(prettyRight.replaceAll("\\s", ""),  "x?x:(x=x)");
aoqi@0: 
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0:     // Helper method
aoqi@0:     private static String prettyPrint(JCTree tree) throws IOException {
aoqi@0:         StringWriter sw = new StringWriter();
aoqi@0:         new Pretty(sw, true).printExpr(tree);
aoqi@0:         return sw.toString();
aoqi@0:     }
aoqi@0: 
aoqi@0: }