/*

 * Copyright (c) 2005, 2010, 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     4813736

 * @summary Additional functionality test of task and JSR 269

 * @author  Peter von der Ah\u00e9

 * @library ./lib

 * @run main TestJavacTaskScanner TestJavacTaskScanner.java

 */

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

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

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

import java.io.*;

import java.net.*;

import java.nio.*;

import java.nio.charset.Charset;

import java.util.Arrays;

import javax.lang.model.element.Element;

import javax.lang.model.element.TypeElement;

import javax.lang.model.type.DeclaredType;

import javax.lang.model.type.TypeMirror;

import javax.lang.model.util.Elements;

import javax.lang.model.util.Types;

import javax.tools.*;

import static javax.tools.StandardLocation.CLASS_PATH;

import static javax.tools.StandardLocation.SOURCE_PATH;

import static javax.tools.StandardLocation.CLASS_OUTPUT;

public class TestJavacTaskScanner extends ToolTester {

    final JavacTaskImpl task;

    final Elements elements;

    final Types types;

    int numTokens;

    int numParseTypeElements;

    int numAllMembers;

    TestJavacTaskScanner(File file) {

        final Iterable<? extends JavaFileObject> compilationUnits =

            fm.getJavaFileObjects(new File[] {file});

        StandardJavaFileManager fm = getLocalFileManager(tool, null, null);

        task = (JavacTaskImpl)tool.getTask(null, fm, null, null, null, compilationUnits);

        task.getContext().put(ScannerFactory.scannerFactoryKey,

                new MyScanner.Factory(task.getContext(), this));

        elements = task.getElements();

        types = task.getTypes();

    }

    public void run() {

        Iterable<? extends TypeElement> toplevels;

        try {

            toplevels = task.enter(task.parse());

        } catch (IOException ex) {

            throw new AssertionError(ex);

        }

        for (TypeElement clazz : toplevels) {

            System.out.format("Testing %s:%n%n", clazz.getSimpleName());

            testParseType(clazz);

            testGetAllMembers(clazz);

            System.out.println();

            System.out.println();

            System.out.println();

        }

        System.out.println("#tokens: " + numTokens);

        System.out.println("#parseTypeElements: " + numParseTypeElements);

        System.out.println("#allMembers: " + numAllMembers);

        check(numTokens, "#Tokens", 1222);

        check(numParseTypeElements, "#parseTypeElements", 136);

        check(numAllMembers, "#allMembers", 67);

    }

    void check(int value, String name, int expected) {

        // allow some slop in the comparison to allow for minor edits in the

        // test and in the platform

        if (value < expected * 9 / 10)

            throw new Error(name + " lower than expected; expected " + expected + "; found: " + value);

        if (value > expected * 11 / 10)

            throw new Error(name + " higher than expected; expected " + expected + "; found: " + value);

    }

    void testParseType(TypeElement clazz) {

        DeclaredType type = (DeclaredType)task.parseType("List<String>", clazz);

        for (Element member : elements.getAllMembers((TypeElement)type.asElement())) {

            TypeMirror mt = types.asMemberOf(type, member);

            System.out.format("%s : %s -> %s%n", member.getSimpleName(), member.asType(), mt);

            numParseTypeElements++;

        }

    }

    public static void main(String... args) throws IOException {

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

        new TestJavacTaskScanner(new File(srcdir, args[0])).run();

    }

    private void testGetAllMembers(TypeElement clazz) {

        for (Element member : elements.getAllMembers(clazz)) {

            System.out.format("%s : %s%n", member.getSimpleName(), member.asType());

            numAllMembers++;

        }

    }

    /* Similar to ToolTester.getFileManager, except that this version also ensures

     * javac classes will be available on the classpath.  The javac classes are assumed

     * to be on the classpath used to run this test (this is true when using jtreg).

     * The classes are found by obtaining the URL for a sample javac class, using

     * getClassLoader().getResource(), and then deconstructing the URL to find the

     * underlying directory or jar file to place on the classpath.

     */

    public StandardJavaFileManager getLocalFileManager(JavaCompiler tool,

                                                        DiagnosticListener<JavaFileObject> dl,

                                                        Charset encoding) {

        File javac_classes;

        try {

            final String javacMainClass = "com/sun/tools/javac/Main.class";

            URL url = getClass().getClassLoader().getResource(javacMainClass);

            if (url == null)

                throw new Error("can't locate javac classes");

            URI uri = url.toURI();

            String scheme = uri.getScheme();

            String ssp = uri.getSchemeSpecificPart();

            if (scheme.equals("jar")) {

                javac_classes = new File(new URI(ssp.substring(0, ssp.indexOf("!/"))));

            } else if (scheme.equals("file")) {

                javac_classes = new File(ssp.substring(0, ssp.indexOf(javacMainClass)));

            } else

                throw new Error("unknown URL: " + url);

        } catch (URISyntaxException e) {

            throw new Error(e);

        }

        System.err.println("javac_classes: " + javac_classes);

        StandardJavaFileManager fm = tool.getStandardFileManager(dl, null, encoding);

        try {

            fm.setLocation(SOURCE_PATH,  Arrays.asList(test_src));

            fm.setLocation(CLASS_PATH,   Arrays.asList(test_classes, javac_classes));

            fm.setLocation(CLASS_OUTPUT, Arrays.asList(test_classes));

        } catch (IOException e) {

            throw new AssertionError(e);

        }

        return fm;

    }

}

class MyScanner extends Scanner {

    public static class Factory extends ScannerFactory {

        public Factory(Context context, TestJavacTaskScanner test) {

            super(context);

            this.test = test;

        }

        @Override

        public Scanner newScanner(CharSequence input, boolean keepDocComments) {

            assert !keepDocComments;

            if (input instanceof CharBuffer) {

                return new MyScanner(this, (CharBuffer)input, test);

            } else {

                char[] array = input.toString().toCharArray();

                return newScanner(array, array.length, keepDocComments);

            }

        }

        @Override

        public Scanner newScanner(char[] input, int inputLength, boolean keepDocComments) {

            assert !keepDocComments;

            return new MyScanner(this, input, inputLength, test);

        }

        private TestJavacTaskScanner test;

    }

    protected MyScanner(ScannerFactory fac, CharBuffer buffer, TestJavacTaskScanner test) {

        super(fac, buffer);

        this.test = test;

    }

    protected MyScanner(ScannerFactory fac, char[] input, int inputLength, TestJavacTaskScanner test) {

        super(fac, input, inputLength);

        this.test = test;

    }

    public void nextToken() {

        super.nextToken();

        System.err.format("Saw token %s (%s)%n", token(), name());

        test.numTokens++;

    }

    private TestJavacTaskScanner test;

}