/*

 * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

/*

 * @test

 * @bug 8231827

 * @summary Check proper positions.

 * @build PatternMatchPosTest

 * @compile/ref=PatternMatchPosTest.out -processor PatternMatchPosTest -Xlint:unchecked -XDrawDiagnostics --enable-preview -source ${jdk.version} PatternMatchPosTestData.java

 */

import java.io.IOException;

import java.util.Set;

import javax.annotation.processing.AbstractProcessor;

import javax.annotation.processing.RoundEnvironment;

import javax.annotation.processing.SupportedAnnotationTypes;

import javax.lang.model.SourceVersion;

import javax.lang.model.element.TypeElement;

import com.sun.source.tree.IfTree;

import com.sun.source.tree.Tree;

import com.sun.source.util.SourcePositions;

import com.sun.source.util.TreePath;

import com.sun.source.util.TreeScanner;

import com.sun.source.util.Trees;

import javax.tools.Diagnostic;

@SupportedAnnotationTypes("*")

public class PatternMatchPosTest extends AbstractProcessor {

    int round;

    @Override

    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {

        if (round++ != 0)

            return false;

        try {

            TypeElement data = processingEnv.getElementUtils().getTypeElement("PatternMatchPosTestData");

            Trees trees = Trees.instance(processingEnv);

            SourcePositions sp = trees.getSourcePositions();

            TreePath dataPath = trees.getPath(data);

            String text = dataPath.getCompilationUnit().getSourceFile().getCharContent(true).toString();

            new TreeScanner<Void, Void>() {

                boolean print;

                @Override

                public Void visitIf(IfTree node, Void p) {

                    boolean prevPrint = print;

                    try {

                        print = true;

                        scan(node.getCondition(), p);

                    } finally {

                        print = prevPrint;

                    }

                    scan(node.getThenStatement(), p);

                    scan(node.getElseStatement(), p);

                    return null;

                }

                @Override

                public Void scan(Tree tree, Void p) {

                    if (tree == null)

                        return null;

                    if (print) {

                        int start = (int) sp.getStartPosition(dataPath.getCompilationUnit(), tree);

                        int end = (int) sp.getEndPosition(dataPath.getCompilationUnit(), tree);

                        processingEnv.getMessager().printMessage(Diagnostic.Kind.NOTE,

                                                                 text.substring(start, end));

                    }

                    return super.scan(tree, p);

                }

            }.scan(dataPath.getLeaf(), null);

            return false;

        } catch (IOException ex) {

            throw new IllegalStateException(ex);

        }

    }

    @Override

    public SourceVersion getSupportedSourceVersion() {

        return SourceVersion.latestSupported();

    }

}