/*

 * Copyright (c) 2010, 2014, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 8041648

 * @summary Verify that end positions are sane if semicolons are missing.

 * @run main MissingSemicolonTest MissingSemicolonTest.java

 */

import java.io.File;

import java.io.IOException;

import java.net.URI;

import java.nio.file.Files;

import java.util.*;

import javax.tools.*;

import com.sun.source.tree.*;

import com.sun.source.tree.Tree.Kind;

import com.sun.source.util.*;

import com.sun.tools.javac.api.JavacTool;

import com.sun.tools.javac.parser.Scanner;

import com.sun.tools.javac.parser.ScannerFactory;

import com.sun.tools.javac.tree.JCTree;

import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;

import com.sun.tools.javac.util.Context;

public class MissingSemicolonTest {

        String testSrc = System.getProperty("test.src");

        File baseDir = new File(testSrc);

        boolean ok = new MissingSemicolonTest().run(baseDir, args);

        if (!ok) {

            throw new Error("failed");

        }

    }

        }

    }

    void test(File file) {

        if (file.isFile() && file.getName().endsWith(".java")) {

            try {

                fileCount++;

                String content = new String(Files.readAllBytes(file.toPath()));

                List<int[]> spans = gatherTreeSpans(file, content);

                int nextSemicolon = -1;

                //remove semicolons, one at a time, and verify the positions are still meaningful:

                while ((nextSemicolon = content.indexOf(';', nextSemicolon + 1)) != (-1)) {

                    String updatedContent =

                            content.substring(0, nextSemicolon) +

                                                 " " +

                                                 content.substring(nextSemicolon + 1);

                    verifyTreeSpans(file, spans, updatedContent, nextSemicolon);

                }

            } catch (IOException e) {

                error("Error reading " + file + ": " + e);

            }

        }

    }

    public List<int[]> gatherTreeSpans(File file, String content) throws IOException {

        JCCompilationUnit unit = read(file.toURI(), content);

        List<int[]> spans = new ArrayList<>();

        new TreePathScanner<Void, Void>() {

            @Override

            public Void scan(Tree tree, Void p) {

                if (tree != null) {

                    int start = ((JCTree) tree).getStartPosition();

                    int end = ((JCTree) tree).getEndPosition(unit.endPositions);

                    spans.add(new int[] {start, end});

                }

                return super.scan(tree, p);

            }

        }.scan(unit, null);

        return spans;

    }

    public void verifyTreeSpans(File file, List<int[]> spans,

                                String updatedContent, int semicolon) throws IOException {

        JCCompilationUnit updated = read(file.toURI(), updatedContent);

        Iterator<int[]> nextSpan = spans.iterator();

        new TreePathScanner<Void, Void>() {

            @Override

            public Void scan(Tree tree, Void p) {

                if (tree != null) {

                    int start = ((JCTree) tree).getStartPosition();

                    int end = ((JCTree) tree).getEndPosition(updated.endPositions);

                    if (tree.getKind() != Kind.ERRONEOUS) {

                        int[] expected = nextSpan.next();

                        int expectedEnd = expected[1];

                        if (expectedEnd == semicolon + 1) {

                            Scanner scanner = scannerFactory.newScanner(updatedContent, true);

                            scanner.nextToken();

                            while (scanner.token().pos < expectedEnd)

                                scanner.nextToken();

                            expectedEnd = scanner.token().pos;

                        }

                        if (expected[0] != start || expectedEnd != end) {

                            error(updatedContent + "; semicolon: " + semicolon + "; expected: " +

                                  expected[0] + "-" + expectedEnd + "; found=" + start + "-" + end +

                                  ";" + tree);

                        }

                    }

                }

                return super.scan(tree, p);

            }

        }.scan(updated, null);

    }

    DiagnosticListener<JavaFileObject> devNull = (d) -> {};

    JavacTool tool = JavacTool.create();

    StandardJavaFileManager fm = tool.getStandardFileManager(devNull, null, null);

    ScannerFactory scannerFactory = ScannerFactory.instance(new Context());

    /**

     * Read a file.

     * @param file the file to be read

     * @return the tree for the content of the file

     * @throws IOException if any IO errors occur

     * @throws MissingSemicolonTest.ParseException if any errors occur while parsing the file

     */

    JCCompilationUnit read(URI uri, String content) throws IOException {

        JavacTool tool = JavacTool.create();

        JavacTask task = tool.getTask(null, fm, devNull, Collections.<String>emptyList(), null,

                Arrays.<JavaFileObject>asList(new JavaSource(uri, content)));

        Iterable<? extends CompilationUnitTree> trees = task.parse();

        Iterator<? extends CompilationUnitTree> iter = trees.iterator();

        if (!iter.hasNext())

            throw new Error("no trees found");

        JCCompilationUnit t = (JCCompilationUnit) iter.next();

        if (iter.hasNext())

            throw new Error("too many trees found");

        return t;

    }

    class JavaSource extends SimpleJavaFileObject {

        private final String content;

        public JavaSource(URI uri, String content) {

            super(uri, JavaFileObject.Kind.SOURCE);

            this.content = content;

        }

        @Override

        public CharSequence getCharContent(boolean ignoreEncodingErrors) {

            return content;

        }

    }

    /**

     * Report an error. When the program is complete, the program will either

     * exit or throw an Error if any errors have been reported.

     * @param msg the error message

     */

    void error(String msg) {

        System.err.println(msg);

        errors++;

    }

    /** Number of files that have been analyzed. */

    int fileCount;

    /** Number of errors reported. */

    int errors;

}

class TestCase {

    String str1;

    String str2;

    public TestCase() {

        super();

        super.hashCode();

    }

    public TestCase(String str1, String str2) {

        super();

        this.str1 = str1;

        this.str2 = str2;

        assert true;

    }

    void newClass() {

        new String();

        new String();

    }

    void localVars() {

        String str1 = "";

        String str2;

        String str3;

        final String str4;

    }

    void throwsException() {

        throw new IllegalStateException();

    }

    int returnWithExpression() {

        return 1;

    }

    void returnWithoutExpression() {

        return ;

    }

    void doWhileBreakContinue() {

        do {

            if (true)

                break;

            if (false)

                continue;

        } while(true);

    }

    void labelled() {

        LABEL: doWhileBreakContinue();

    }

}