/*

 * 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

 * @summary tests error and diagnostics positions

 * @author  Jan Lahoda

 */

import com.sun.source.tree.BinaryTree;

import com.sun.source.tree.BlockTree;

import com.sun.source.tree.ClassTree;

import com.sun.source.tree.CompilationUnitTree;

import com.sun.source.tree.ErroneousTree;

import com.sun.source.tree.ExpressionStatementTree;

import com.sun.source.tree.ExpressionTree;

import com.sun.source.tree.MethodInvocationTree;

import com.sun.source.tree.MethodTree;

import com.sun.source.tree.ModifiersTree;

import com.sun.source.tree.StatementTree;

import com.sun.source.tree.Tree;

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

import com.sun.source.tree.VariableTree;

import com.sun.source.tree.WhileLoopTree;

import com.sun.source.util.SourcePositions;

import com.sun.source.util.TreeScanner;

import com.sun.source.util.Trees;

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

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

import java.io.IOException;

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

import java.lang.reflect.Method;

import java.net.URI;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.LinkedList;

import java.util.List;

import java.util.regex.Pattern;

import javax.tools.Diagnostic;

import javax.tools.DiagnosticCollector;

import javax.tools.DiagnosticListener;

import javax.tools.JavaCompiler;

import javax.tools.JavaFileObject;

import javax.tools.SimpleJavaFileObject;

import javax.tools.ToolProvider;

public class JavacParserTest extends TestCase {

    static final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();

    private JavacParserTest(){}

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

        new JavacParserTest().run(args);

    }

    class MyFileObject extends SimpleJavaFileObject {

        private String text;

        public MyFileObject(String text) {

            super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);

            this.text = text;

        }

        @Override

        public CharSequence getCharContent(boolean ignoreEncodingErrors) {

            return text;

        }

    }

    /*

     * converts Windows to Unix style LFs for comparing strings

     */

    String normalize(String in) {

        return in.replace(System.getProperty("line.separator"), "\n");

    }

    CompilationUnitTree getCompilationUnitTree(String code) throws IOException {

        JavacTaskImpl ct = (JavacTaskImpl) tool.getTask(null, null, null, null,

                null, Arrays.asList(new MyFileObject(code)));

        CompilationUnitTree cut = ct.parse().iterator().next();

        return cut;

    }

    List<String> getErroneousTreeValues(ErroneousTree node) {

        List<String> values = new ArrayList<>();

        if (node.getErrorTrees() != null) {

            for (Tree t : node.getErrorTrees()) {

                values.add(t.toString());

            }

        } else {

            throw new RuntimeException("ERROR: No Erroneous tree "

                    + "has been created.");

        }

        return values;

    }

    @Test

    void testPositionForSuperConstructorCalls() throws IOException {

        assert tool != null;

        String code = "package test; public class Test {public Test() {super();}}";

        JavacTaskImpl ct = (JavacTaskImpl) tool.getTask(null, null, null, null,

                null, Arrays.asList(new MyFileObject(code)));

        CompilationUnitTree cut = ct.parse().iterator().next();

        SourcePositions pos = Trees.instance(ct).getSourcePositions();

        MethodTree method =

                (MethodTree) ((ClassTree) cut.getTypeDecls().get(0)).getMembers().get(0);

        ExpressionStatementTree es =

                (ExpressionStatementTree) method.getBody().getStatements().get(0);

        final int esStartPos = code.indexOf(es.toString());

        final int esEndPos = esStartPos + es.toString().length();

        assertEquals("testPositionForSuperConstructorCalls",

                esStartPos, pos.getStartPosition(cut, es));

        assertEquals("testPositionForSuperConstructorCalls",

                esEndPos, pos.getEndPosition(cut, es));

        MethodInvocationTree mit = (MethodInvocationTree) es.getExpression();

        final int mitStartPos = code.indexOf(mit.toString());

        final int mitEndPos = mitStartPos + mit.toString().length();

        assertEquals("testPositionForSuperConstructorCalls",

                mitStartPos, pos.getStartPosition(cut, mit));

        assertEquals("testPositionForSuperConstructorCalls",

                mitEndPos, pos.getEndPosition(cut, mit));

        final int methodStartPos = mitStartPos;

        final int methodEndPos = methodStartPos + mit.getMethodSelect().toString().length();

        assertEquals("testPositionForSuperConstructorCalls",

                methodStartPos, pos.getStartPosition(cut, mit.getMethodSelect()));

        assertEquals("testPositionForSuperConstructorCalls",

                methodEndPos, pos.getEndPosition(cut, mit.getMethodSelect()));

    }

    @Test

    void testPositionForEnumModifiers() throws IOException {

        final String theString = "public";

        String code = "package test; " + theString + " enum Test {A;}";

        JavacTaskImpl ct = (JavacTaskImpl) tool.getTask(null, null, null, null,

                null, Arrays.asList(new MyFileObject(code)));

        CompilationUnitTree cut = ct.parse().iterator().next();

        SourcePositions pos = Trees.instance(ct).getSourcePositions();

        ClassTree clazz = (ClassTree) cut.getTypeDecls().get(0);

        ModifiersTree mt = clazz.getModifiers();

        int spos = code.indexOf(theString);

        int epos = spos + theString.length();

        assertEquals("testPositionForEnumModifiers",

                spos, pos.getStartPosition(cut, mt));

        assertEquals("testPositionForEnumModifiers",

                epos, pos.getEndPosition(cut, mt));

    }

    @Test

    void testNewClassWithEnclosing() throws IOException {

        final String theString = "Test.this.new d()";

        String code = "package test; class Test { " +

                "class d {} private void method() { " +

                "Object o = " + theString + "; } }";

        JavacTaskImpl ct = (JavacTaskImpl) tool.getTask(null, null, null, null,

                null, Arrays.asList(new MyFileObject(code)));

        CompilationUnitTree cut = ct.parse().iterator().next();

        SourcePositions pos = Trees.instance(ct).getSourcePositions();

        ClassTree clazz = (ClassTree) cut.getTypeDecls().get(0);

        ExpressionTree est =

                ((VariableTree) ((MethodTree) clazz.getMembers().get(1)).getBody().getStatements().get(0)).getInitializer();

        final int spos = code.indexOf(theString);

        final int epos = spos + theString.length();

        assertEquals("testNewClassWithEnclosing",

                spos, pos.getStartPosition(cut, est));

        assertEquals("testNewClassWithEnclosing",

                epos, pos.getEndPosition(cut, est));

    }

    @Test

    void testPreferredPositionForBinaryOp() throws IOException {

        String code = "package test; public class Test {"

                + "private void test() {"

                + "Object o = null; boolean b = o != null && o instanceof String;"

                + "} private Test() {}}";

        CompilationUnitTree cut = getCompilationUnitTree(code);

        ClassTree clazz = (ClassTree) cut.getTypeDecls().get(0);

        MethodTree method = (MethodTree) clazz.getMembers().get(0);

        VariableTree condSt = (VariableTree) method.getBody().getStatements().get(1);

        BinaryTree cond = (BinaryTree) condSt.getInitializer();

        JCTree condJC = (JCTree) cond;

        int condStartPos = code.indexOf("&&");

        assertEquals("testPreferredPositionForBinaryOp",

                condStartPos, condJC.pos);

    }

    @Test

    void testErrorRecoveryForEnhancedForLoop142381() throws IOException {

        String code = "package test; class Test { " +

                "private void method() { " +

                "java.util.Set<String> s = null; for (a : s) {} } }";

        final List<Diagnostic<? extends JavaFileObject>> errors =

                new LinkedList<Diagnostic<? extends JavaFileObject>>();

        JavacTaskImpl ct = (JavacTaskImpl) tool.getTask(null, null,

                new DiagnosticListener<JavaFileObject>() {

            public void report(Diagnostic<? extends JavaFileObject> diagnostic) {

                errors.add(diagnostic);

            }

        }, null, null, Arrays.asList(new MyFileObject(code)));

        CompilationUnitTree cut = ct.parse().iterator().next();

        ClassTree clazz = (ClassTree) cut.getTypeDecls().get(0);

        StatementTree forStatement =

                ((MethodTree) clazz.getMembers().get(0)).getBody().getStatements().get(1);

        assertEquals("testErrorRecoveryForEnhancedForLoop142381",

                Kind.ENHANCED_FOR_LOOP, forStatement.getKind());

        assertFalse("testErrorRecoveryForEnhancedForLoop142381", errors.isEmpty());

    }

    @Test

    void testPositionAnnotationNoPackage187551() throws IOException {

        String code = "\n@interface Test {}";

        JavacTaskImpl ct = (JavacTaskImpl) tool.getTask(null, null, null, null,

                null, Arrays.asList(new MyFileObject(code)));

        CompilationUnitTree cut = ct.parse().iterator().next();

        ClassTree clazz = (ClassTree) cut.getTypeDecls().get(0);

        Trees t = Trees.instance(ct);

        assertEquals("testPositionAnnotationNoPackage187551",

                1, t.getSourcePositions().getStartPosition(cut, clazz));

    }

    @Test

    void testPositionsSane1() throws IOException {

        performPositionsSanityTest("package test; class Test { " +

                "private void method() { " +

                "java.util.List<? extends java.util.List<? extends String>> l; " +

                "} }");

    }

    @Test

    void testPositionsSane2() throws IOException {

        performPositionsSanityTest("package test; class Test { " +

                "private void method() { " +

                "java.util.List<? super java.util.List<? super String>> l; " +

                "} }");

    }

    @Test

    void testPositionsSane3() throws IOException {

        performPositionsSanityTest("package test; class Test { " +

                "private void method() { " +

                "java.util.List<? super java.util.List<?>> l; } }");

    }

    private void performPositionsSanityTest(String code) throws IOException {

        final List<Diagnostic<? extends JavaFileObject>> errors =

                new LinkedList<Diagnostic<? extends JavaFileObject>>();

        JavacTaskImpl ct = (JavacTaskImpl) tool.getTask(null, null,

                new DiagnosticListener<JavaFileObject>() {

            public void report(Diagnostic<? extends JavaFileObject> diagnostic) {

                errors.add(diagnostic);

            }

        }, null, null, Arrays.asList(new MyFileObject(code)));

        final CompilationUnitTree cut = ct.parse().iterator().next();

        final Trees trees = Trees.instance(ct);

        new TreeScanner<Void, Void>() {

            private long parentStart = 0;

            private long parentEnd = Integer.MAX_VALUE;

            @Override

            public Void scan(Tree node, Void p) {

                if (node == null) {

                    return null;

                }

                long start = trees.getSourcePositions().getStartPosition(cut, node);

                if (start == (-1)) {

                    return null; // synthetic tree

                }

                assertTrue(node.toString() + ":" + start + "/" + parentStart,

                        parentStart <= start);

                long prevParentStart = parentStart;

                parentStart = start;

                long end = trees.getSourcePositions().getEndPosition(cut, node);

                assertTrue(node.toString() + ":" + end + "/" + parentEnd,

                        end <= parentEnd);

                long prevParentEnd = parentEnd;

                parentEnd = end;

                super.scan(node, p);

                parentStart = prevParentStart;

                parentEnd = prevParentEnd;

                return null;

            }

            private void assertTrue(String message, boolean b) {

                if (!b) fail(message);

            }

        }.scan(cut, null);

    }

    @Test

    void testCorrectWilcardPositions1() throws IOException {

        performWildcardPositionsTest("package test; import java.util.List; " +

                "class Test { private void method() { List<? extends List<? extends String>> l; } }",

                Arrays.asList("List<? extends List<? extends String>> l;",

                "List<? extends List<? extends String>>",

                "List",

                "? extends List<? extends String>",

                "List<? extends String>",

                "List",

                "? extends String",

                "String"));

    }

    @Test

    void testCorrectWilcardPositions2() throws IOException {

        performWildcardPositionsTest("package test; import java.util.List; "

                + "class Test { private void method() { List<? super List<? super String>> l; } }",

                Arrays.asList("List<? super List<? super String>> l;",

                "List<? super List<? super String>>",

                "List",

                "? super List<? super String>",

                "List<? super String>",

                "List",

                "? super String",

                "String"));

    }

    @Test

    void testCorrectWilcardPositions3() throws IOException {

        performWildcardPositionsTest("package test; import java.util.List; " +

                "class Test { private void method() { List<? super List<?>> l; } }",

                Arrays.asList("List<? super List<?>> l;",

                "List<? super List<?>>",

                "List",

                "? super List<?>",

                "List<?>",

                "List",

                "?"));

    }

    @Test

    void testCorrectWilcardPositions4() throws IOException {

        performWildcardPositionsTest("package test; import java.util.List; " +

                "class Test { private void method() { " +

                "List<? extends List<? extends List<? extends String>>> l; } }",

                Arrays.asList("List<? extends List<? extends List<? extends String>>> l;",

                "List<? extends List<? extends List<? extends String>>>",

                "List",

                "? extends List<? extends List<? extends String>>",

                "List<? extends List<? extends String>>",

                "List",

                "? extends List<? extends String>",

                "List<? extends String>",

                "List",

                "? extends String",

                "String"));

    }

    @Test

    void testCorrectWilcardPositions5() throws IOException {

        performWildcardPositionsTest("package test; import java.util.List; " +

                "class Test { private void method() { " +

                "List<? extends List<? extends List<? extends String   >>> l; } }",

                Arrays.asList("List<? extends List<? extends List<? extends String   >>> l;",

                "List<? extends List<? extends List<? extends String   >>>",

                "List",

                "? extends List<? extends List<? extends String   >>",

                "List<? extends List<? extends String   >>",

                "List",

                "? extends List<? extends String   >",

                "List<? extends String   >",

                "List",

                "? extends String",

                "String"));

    }

    void performWildcardPositionsTest(final String code,

            List<String> golden) throws IOException {

        final List<Diagnostic<? extends JavaFileObject>> errors =

                new LinkedList<Diagnostic<? extends JavaFileObject>>();

        JavacTaskImpl ct = (JavacTaskImpl) tool.getTask(null, null,

                new DiagnosticListener<JavaFileObject>() {

                    public void report(Diagnostic<? extends JavaFileObject> diagnostic) {

                        errors.add(diagnostic);

                    }

                }, null, null, Arrays.asList(new MyFileObject(code)));

        final CompilationUnitTree cut = ct.parse().iterator().next();

        final List<String> content = new LinkedList<String>();

        final Trees trees = Trees.instance(ct);

        new TreeScanner<Void, Void>() {

            @Override

            public Void scan(Tree node, Void p) {

                if (node == null) {

                    return null;

                }

                long start = trees.getSourcePositions().getStartPosition(cut, node);

                if (start == (-1)) {

                    return null; // synthetic tree

                }

                long end = trees.getSourcePositions().getEndPosition(cut, node);

                String s = code.substring((int) start, (int) end);

                content.add(s);

                return super.scan(node, p);

            }

        }.scan(((MethodTree) ((ClassTree) cut.getTypeDecls().get(0)).getMembers().get(0)).getBody().getStatements().get(0), null);

        assertEquals("performWildcardPositionsTest",golden.toString(),

                content.toString());

    }

    @Test

    void testStartPositionForMethodWithoutModifiers() throws IOException {

        String code = "package t; class Test { <T> void t() {} }";

        JavacTaskImpl ct = (JavacTaskImpl) tool.getTask(null, null, null, null,

                null, Arrays.asList(new MyFileObject(code)));

        CompilationUnitTree cut = ct.parse().iterator().next();

        ClassTree clazz = (ClassTree) cut.getTypeDecls().get(0);

        MethodTree mt = (MethodTree) clazz.getMembers().get(0);

        Trees t = Trees.instance(ct);

        int start = (int) t.getSourcePositions().getStartPosition(cut, mt);

        int end = (int) t.getSourcePositions().getEndPosition(cut, mt);

        assertEquals("testStartPositionForMethodWithoutModifiers",

                "<T> void t() {}", code.substring(start, end));

    }

    @Test

    void testVariableInIfThen1() throws IOException {

        String code = "package t; class Test { " +

                "private static void t(String name) { " +

                "if (name != null) String nn = name.trim(); } }";