langtools/test/tools/javac/treepostests/TreePosTest.java
changeset 5114 27cccdaba851
parent 5113 85992faf57f5
parent 5020 c94d9cc81f49
child 5115 204e24e427b0
--- a/langtools/test/tools/javac/treepostests/TreePosTest.java	Fri Mar 12 17:44:50 2010 -0800
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,762 +0,0 @@
-/*
- * Copyright 2010 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
- */
-
-import java.awt.BorderLayout;
-import java.awt.Color;
-import java.awt.Dimension;
-import java.awt.EventQueue;
-import java.awt.Font;
-import java.awt.GridBagConstraints;
-import java.awt.GridBagLayout;
-import java.awt.Rectangle;
-import java.awt.event.ActionEvent;
-import java.awt.event.ActionListener;
-import java.awt.event.MouseAdapter;
-import java.awt.event.MouseEvent;
-import java.io.File;
-import java.io.IOException;
-import java.io.PrintStream;
-import java.io.PrintWriter;
-import java.io.StringWriter;
-import java.lang.reflect.Field;
-import java.lang.reflect.Modifier;
-import java.nio.charset.Charset;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-import javax.swing.DefaultComboBoxModel;
-import javax.swing.JComboBox;
-import javax.swing.JComponent;
-import javax.swing.JFrame;
-import javax.swing.JLabel;
-import javax.swing.JPanel;
-import javax.swing.JScrollPane;
-import javax.swing.JTextArea;
-import javax.swing.JTextField;
-import javax.swing.SwingUtilities;
-import javax.swing.event.CaretEvent;
-import javax.swing.event.CaretListener;
-import javax.swing.text.BadLocationException;
-import javax.swing.text.DefaultHighlighter;
-import javax.swing.text.Highlighter;
-import javax.tools.Diagnostic;
-import javax.tools.DiagnosticListener;
-import javax.tools.JavaFileObject;
-import javax.tools.StandardJavaFileManager;
-
-import com.sun.source.tree.CompilationUnitTree;
-import com.sun.source.util.JavacTask;
-import com.sun.tools.javac.api.JavacTool;
-import com.sun.tools.javac.code.Flags;
-import com.sun.tools.javac.tree.JCTree;
-import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
-import com.sun.tools.javac.tree.JCTree.JCNewClass;
-import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
-import com.sun.tools.javac.tree.TreeInfo;
-import com.sun.tools.javac.tree.TreeScanner;
-
-import static com.sun.tools.javac.util.Position.NOPOS;
-
-/**
- * Utility and test program to check validity of tree positions for tree nodes.
- * The program can be run standalone, or as a jtreg test.  In standalone mode,
- * errors can be displayed in a gui viewer. For info on command line args,
- * run program with no args.
- *
- * <p>
- * jtreg: Note that by using the -r switch in the test description below, this test
- * will process all java files in the langtools/test directory, thus implicitly
- * covering any new language features that may be tested in this test suite.
- */
-
-/*
- * @test
- * @bug 6919889
- * @summary assorted position errors in compiler syntax trees
- * @run main TreePosTest -q -r -ef ./tools/javac/typeAnnotations -ef ./tools/javap/typeAnnotations -et ANNOTATED_TYPE .
- */
-public class TreePosTest {
-    /**
-     * Main entry point.
-     * If test.src is set, program runs in jtreg mode, and will throw an Error
-     * if any errors arise, otherwise System.exit will be used, unless the gui
-     * viewer is being used. In jtreg mode, the default base directory for file
-     * args is the value of ${test.src}. In jtreg mode, the -r option can be
-     * given to change the default base directory to the root test directory.
-     */
-    public static void main(String... args) {
-        String testSrc = System.getProperty("test.src");
-        File baseDir = (testSrc == null) ? null : new File(testSrc);
-        boolean ok = new TreePosTest().run(baseDir, args);
-        if (!ok) {
-            if (testSrc != null)  // jtreg mode
-                throw new Error("failed");
-            else
-                System.exit(1);
-        }
-    }
-
-    /**
-     * Run the program. A base directory can be provided for file arguments.
-     * In jtreg mode, the -r option can be given to change the default base
-     * directory to the test root directory. For other options, see usage().
-     * @param baseDir base directory for any file arguments.
-     * @param args command line args
-     * @return true if successful or in gui mode
-     */
-    boolean run(File baseDir, String... args) {
-        if (args.length == 0) {
-            usage(System.out);
-            return true;
-        }
-
-        List<File> files = new ArrayList<File>();
-        for (int i = 0; i < args.length; i++) {
-            String arg = args[i];
-            if (arg.equals("-encoding") && i + 1 < args.length)
-                encoding = args[++i];
-            else if (arg.equals("-gui"))
-                gui = true;
-            else if (arg.equals("-q"))
-                quiet = true;
-            else if (arg.equals("-v"))
-                verbose = true;
-            else if (arg.equals("-t") && i + 1 < args.length)
-                tags.add(args[++i]);
-            else if (arg.equals("-ef") && i + 1 < args.length)
-                excludeFiles.add(new File(baseDir, args[++i]));
-            else if (arg.equals("-et") && i + 1 < args.length)
-                excludeTags.add(args[++i]);
-            else if (arg.equals("-r")) {
-                if (excludeFiles.size() > 0)
-                    throw new Error("-r must be used before -ef");
-                File d = baseDir;
-                while (!new File(d, "TEST.ROOT").exists()) {
-                    d = d.getParentFile();
-                    if (d == null)
-                        throw new Error("cannot find TEST.ROOT");
-                }
-                baseDir = d;
-            }
-            else if (arg.startsWith("-"))
-                throw new Error("unknown option: " + arg);
-            else {
-                while (i < args.length)
-                    files.add(new File(baseDir, args[i++]));
-            }
-        }
-
-        for (File file: files) {
-            if (file.exists())
-                test(file);
-            else
-                error("File not found: " + file);
-        }
-
-        if (fileCount != 1)
-            System.err.println(fileCount + " files read");
-        if (errors > 0)
-            System.err.println(errors + " errors");
-
-        return (gui || errors == 0);
-    }
-
-    /**
-     * Print command line help.
-     * @param out output stream
-     */
-    void usage(PrintStream out) {
-        out.println("Usage:");
-        out.println("  java TreePosTest options... files...");
-        out.println("");
-        out.println("where options include:");
-        out.println("-gui      Display returns in a GUI viewer");
-        out.println("-q        Quiet: don't report on inapplicable files");
-        out.println("-v        Verbose: report on files as they are being read");
-        out.println("-t tag    Limit checks to tree nodes with this tag");
-        out.println("          Can be repeated if desired");
-        out.println("-ef file  Exclude file or directory");
-        out.println("-et tag   Exclude tree nodes with given tag name");
-        out.println("");
-        out.println("files may be directories or files");
-        out.println("directories will be scanned recursively");
-        out.println("non java files, or java files which cannot be parsed, will be ignored");
-        out.println("");
-    }
-
-    /**
-     * Test a file. If the file is a directory, it will be recursively scanned
-     * for java files.
-     * @param file the file or directory to test
-     */
-    void test(File file) {
-        if (excludeFiles.contains(file)) {
-            if (!quiet)
-                error("File " + file + " excluded");
-            return;
-        }
-
-        if (file.isDirectory()) {
-            for (File f: file.listFiles()) {
-                test(f);
-            }
-            return;
-        }
-
-        if (file.isFile() && file.getName().endsWith(".java")) {
-            try {
-                if (verbose)
-                    System.err.println(file);
-                fileCount++;
-                PosTester p = new PosTester();
-                p.test(read(file));
-            } catch (ParseException e) {
-                if (!quiet) {
-                    error("Error parsing " + file + "\n" + e.getMessage());
-                }
-            } catch (IOException e) {
-                error("Error reading " + file + ": " + e);
-            }
-            return;
-        }
-
-        if (!quiet)
-            error("File " + file + " ignored");
-    }
-
-    /**
-     * 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 TreePosTest.ParseException if any errors occur while parsing the file
-     */
-    JCCompilationUnit read(File file) throws IOException, ParseException {
-        StringWriter sw = new StringWriter();
-        PrintWriter pw = new PrintWriter(sw);
-        Reporter r = new Reporter(pw);
-        JavacTool tool = JavacTool.create();
-        Charset cs = (encoding == null ? null : Charset.forName(encoding));
-        StandardJavaFileManager fm = tool.getStandardFileManager(r, null, null);
-        Iterable<? extends JavaFileObject> files = fm.getJavaFileObjects(file);
-        JavacTask task = tool.getTask(pw, fm, r, Collections.<String>emptyList(), null, files);
-        Iterable<? extends CompilationUnitTree> trees = task.parse();
-        pw.flush();
-        if (r.errors > 0)
-            throw new ParseException(sw.toString());
-        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;
-    }
-
-    /**
-     * 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;
-    /** Flag: don't report irrelevant files. */
-    boolean quiet;
-    /** Flag: report files as they are processed. */
-    boolean verbose;
-    /** Flag: show errors in GUI viewer. */
-    boolean gui;
-    /** Option: encoding for test files. */
-    String encoding;
-    /** The GUI viewer for errors. */
-    Viewer viewer;
-    /** The set of tags for tree nodes to be analyzed; if empty, all tree nodes
-     * are analyzed. */
-    Set<String> tags = new HashSet<String>();
-    /** Set of files and directories to be excluded from analysis. */
-    Set<File> excludeFiles = new HashSet<File>();
-    /** Set of tag names to be excluded from analysis. */
-    Set<String> excludeTags = new HashSet<String>();
-    /** Table of printable names for tree tag values. */
-    TagNames tagNames = new TagNames();
-
-    /**
-     * Main class for testing assertions concerning tree positions for tree nodes.
-     */
-    private class PosTester extends TreeScanner {
-        void test(JCCompilationUnit tree) {
-            sourcefile = tree.sourcefile;
-            endPosTable = tree.endPositions;
-            encl = new Info();
-            tree.accept(this);
-        }
-
-        @Override
-        public void scan(JCTree tree) {
-            if (tree == null)
-                return;
-
-            Info self = new Info(tree, endPosTable);
-            if (check(encl, self)) {
-                // Modifiers nodes are present throughout the tree even where
-                // there is no corresponding source text.
-                // Redundant semicolons in a class definition can cause empty
-                // initializer blocks with no positions.
-                if ((self.tag == JCTree.MODIFIERS || self.tag == JCTree.BLOCK)
-                        && self.pos == NOPOS) {
-                    // If pos is NOPOS, so should be the start and end positions
-                    check("start == NOPOS", encl, self, self.start == NOPOS);
-                    check("end == NOPOS", encl, self, self.end == NOPOS);
-                } else {
-                    // For this node, start , pos, and endpos should be all defined
-                    check("start != NOPOS", encl, self, self.start != NOPOS);
-                    check("pos != NOPOS", encl, self, self.pos != NOPOS);
-                    check("end != NOPOS", encl, self, self.end != NOPOS);
-                    // The following should normally be ordered
-                    // encl.start <= start <= pos <= end <= encl.end
-                    // In addition, the position of the enclosing node should be
-                    // within this node.
-                    // The primary exceptions are for array type nodes, because of the
-                    // need to support legacy syntax:
-                    //    e.g.    int a[];    int[] b[];    int f()[] { return null; }
-                    // and because of inconsistent nesting of left and right of
-                    // array declarations:
-                    //    e.g.    int[][] a = new int[2][];
-                    check("encl.start <= start", encl, self, encl.start <= self.start);
-                    check("start <= pos", encl, self, self.start <= self.pos);
-                    if (!(self.tag == JCTree.TYPEARRAY
-                            && (encl.tag == JCTree.VARDEF || encl.tag == JCTree.TYPEARRAY))) {
-                        check("encl.pos <= start || end <= encl.pos",
-                                encl, self, encl.pos <= self.start || self.end <= encl.pos);
-                    }
-                    check("pos <= end", encl, self, self.pos <= self.end);
-                    if (!(self.tag == JCTree.TYPEARRAY && encl.tag == JCTree.TYPEARRAY)) {
-                        check("end <= encl.end", encl, self, self.end <= encl.end);
-                    }
-                }
-            }
-
-            Info prevEncl = encl;
-            encl = self;
-            tree.accept(this);
-            encl = prevEncl;
-        }
-
-        @Override
-        public void visitVarDef(JCVariableDecl tree) {
-            // enum member declarations are desugared in the parser and have
-            // ill-defined semantics for tree positions, so for now, we
-            // skip the synthesized bits and just check parts which came from
-            // the original source text
-            if ((tree.mods.flags & Flags.ENUM) != 0) {
-                scan(tree.mods);
-                if (tree.init != null) {
-                    if (tree.init.getTag() == JCTree.NEWCLASS) {
-                        JCNewClass init = (JCNewClass) tree.init;
-                        if (init.args != null && init.args.nonEmpty()) {
-                            scan(init.args);
-                        }
-                        if (init.def != null && init.def.defs != null) {
-                            scan(init.def.defs);
-                        }
-                    }
-                }
-            } else
-                super.visitVarDef(tree);
-        }
-
-        boolean check(Info encl, Info self) {
-            if (excludeTags.size() > 0) {
-                if (encl != null && excludeTags.contains(tagNames.get(encl.tag))
-                        || excludeTags.contains(tagNames.get(self.tag)))
-                    return false;
-            }
-            return tags.size() == 0 || tags.contains(tagNames.get(self.tag));
-        }
-
-        void check(String label, Info encl, Info self, boolean ok) {
-            if (!ok) {
-                if (gui) {
-                    if (viewer == null)
-                        viewer = new Viewer();
-                    viewer.addEntry(sourcefile, label, encl, self);
-                }
-
-                String s = self.tree.toString();
-                String msg = sourcefile.getName() + ": " + label + ": " +
-                        "encl:" + encl + " this:" + self + "\n" +
-                        s.substring(0, Math.min(80, s.length())).replaceAll("[\r\n]+", " ");
-                error(msg);
-            }
-        }
-
-        JavaFileObject sourcefile;
-        Map<JCTree, Integer> endPosTable;
-        Info encl;
-
-    }
-
-    /**
-     * Utility class providing easy access to position and other info for a tree node.
-     */
-    private class Info {
-        Info() {
-            tree = null;
-            tag = JCTree.ERRONEOUS;
-            start = 0;
-            pos = 0;
-            end = Integer.MAX_VALUE;
-        }
-
-        Info(JCTree tree, Map<JCTree, Integer> endPosTable) {
-            this.tree = tree;
-            tag = tree.getTag();
-            start = TreeInfo.getStartPos(tree);
-            pos = tree.pos;
-            end = TreeInfo.getEndPos(tree, endPosTable);
-        }
-
-        @Override
-        public String toString() {
-            return tagNames.get(tree.getTag()) + "[start:" + start + ",pos:" + pos + ",end:" + end + "]";
-        }
-
-        final JCTree tree;
-        final int tag;
-        final int start;
-        final int pos;
-        final int end;
-    }
-
-    /**
-     * Names for tree tags.
-     * javac does not provide an API to convert tag values to strings, so this class uses
-     * reflection to determine names of public static final int values in JCTree.
-     */
-    private static class TagNames {
-        String get(int tag) {
-            if (map == null) {
-                map = new HashMap<Integer, String>();
-                Class c = JCTree.class;
-                for (Field f : c.getDeclaredFields()) {
-                    if (f.getType().equals(int.class)) {
-                        int mods = f.getModifiers();
-                        if (Modifier.isPublic(mods) && Modifier.isStatic(mods) && Modifier.isFinal(mods)) {
-                            try {
-                                map.put(f.getInt(null), f.getName());
-                            } catch (IllegalAccessException e) {
-                            }
-                        }
-                    }
-                }
-            }
-            String name = map.get(tag);
-            return (name == null) ? "??" : name;
-        }
-
-        private Map<Integer, String> map;
-    }
-
-    /**
-     * Thrown when errors are found parsing a java file.
-     */
-    private static class ParseException extends Exception {
-        ParseException(String msg) {
-            super(msg);
-        }
-    }
-
-    /**
-     * DiagnosticListener to report diagnostics and count any errors that occur.
-     */
-    private static class Reporter implements DiagnosticListener<JavaFileObject> {
-        Reporter(PrintWriter out) {
-            this.out = out;
-        }
-
-        public void report(Diagnostic<? extends JavaFileObject> diagnostic) {
-            out.println(diagnostic);
-            switch (diagnostic.getKind()) {
-                case ERROR:
-                    errors++;
-            }
-        }
-        int errors;
-        PrintWriter out;
-    }
-
-    /**
-     * GUI viewer for issues found by TreePosTester. The viewer provides a drop
-     * down list for selecting error conditions, a header area providing details
-     * about an error, and a text area with the ranges of text highlighted as
-     * appropriate.
-     */
-    private class Viewer extends JFrame {
-        /**
-         * Create a viewer.
-         */
-        Viewer() {
-            initGUI();
-        }
-
-        /**
-         * Add another entry to the list of errors.
-         * @param file The file containing the error
-         * @param check The condition that was being tested, and which failed
-         * @param encl the enclosing tree node
-         * @param self the tree node containing the error
-         */
-        void addEntry(JavaFileObject file, String check, Info encl, Info self) {
-            Entry e = new Entry(file, check, encl, self);
-            DefaultComboBoxModel m = (DefaultComboBoxModel) entries.getModel();
-            m.addElement(e);
-            if (m.getSize() == 1)
-                entries.setSelectedItem(e);
-        }
-
-        /**
-         * Initialize the GUI window.
-         */
-        private void initGUI() {
-            JPanel head = new JPanel(new GridBagLayout());
-            GridBagConstraints lc = new GridBagConstraints();
-            GridBagConstraints fc = new GridBagConstraints();
-            fc.anchor = GridBagConstraints.WEST;
-            fc.fill = GridBagConstraints.HORIZONTAL;
-            fc.gridwidth = GridBagConstraints.REMAINDER;
-
-            entries = new JComboBox();
-            entries.addActionListener(new ActionListener() {
-                public void actionPerformed(ActionEvent e) {
-                    showEntry((Entry) entries.getSelectedItem());
-                }
-            });
-            fc.insets.bottom = 10;
-            head.add(entries, fc);
-            fc.insets.bottom = 0;
-            head.add(new JLabel("check:"), lc);
-            head.add(checkField = createTextField(80), fc);
-            fc.fill = GridBagConstraints.NONE;
-            head.add(setBackground(new JLabel("encl:"), enclColor), lc);
-            head.add(enclPanel = new InfoPanel(), fc);
-            head.add(setBackground(new JLabel("self:"), selfColor), lc);
-            head.add(selfPanel = new InfoPanel(), fc);
-            add(head, BorderLayout.NORTH);
-
-            body = new JTextArea();
-            body.setFont(Font.decode(Font.MONOSPACED));
-            body.addCaretListener(new CaretListener() {
-                public void caretUpdate(CaretEvent e) {
-                    int dot = e.getDot();
-                    int mark = e.getMark();
-                    if (dot == mark)
-                        statusText.setText("dot: " + dot);
-                    else
-                        statusText.setText("dot: " + dot + ", mark:" + mark);
-                }
-            });
-            JScrollPane p = new JScrollPane(body,
-                    JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
-                    JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
-            p.setPreferredSize(new Dimension(640, 480));
-            add(p, BorderLayout.CENTER);
-
-            statusText = createTextField(80);
-            add(statusText, BorderLayout.SOUTH);
-
-            pack();
-            setLocationRelativeTo(null); // centered on screen
-            setVisible(true);
-            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
-        }
-
-        /** Show an entry that has been selected. */
-        private void showEntry(Entry e) {
-            try {
-                // update simple fields
-                setTitle(e.file.getName());
-                checkField.setText(e.check);
-                enclPanel.setInfo(e.encl);
-                selfPanel.setInfo(e.self);
-                // show file text with highlights
-                body.setText(e.file.getCharContent(true).toString());
-                Highlighter highlighter = body.getHighlighter();
-                highlighter.removeAllHighlights();
-                addHighlight(highlighter, e.encl, enclColor);
-                addHighlight(highlighter, e.self, selfColor);
-                scroll(body, getMinPos(enclPanel.info, selfPanel.info));
-            } catch (IOException ex) {
-                body.setText("Cannot read " + e.file.getName() + ": " + e);
-            }
-        }
-
-        /** Create a test field. */
-        private JTextField createTextField(int width) {
-            JTextField f = new JTextField(width);
-            f.setEditable(false);
-            f.setBorder(null);
-            return f;
-        }
-
-        /** Add a highlighted region based on the positions in an Info object. */
-        private void addHighlight(Highlighter h, Info info, Color c) {
-            int start = info.start;
-            int end = info.end;
-            if (start == -1 && end == -1)
-                return;
-            if (start == -1)
-                start = end;
-            if (end == -1)
-                end = start;
-            try {
-                h.addHighlight(info.start, info.end,
-                        new DefaultHighlighter.DefaultHighlightPainter(c));
-                if (info.pos != -1) {
-                    Color c2 = new Color(c.getRed(), c.getGreen(), c.getBlue(), (int)(.4f * 255)); // 40%
-                    h.addHighlight(info.pos, info.pos + 1,
-                        new DefaultHighlighter.DefaultHighlightPainter(c2));
-                }
-            } catch (BadLocationException e) {
-                e.printStackTrace();
-            }
-        }
-
-        /** Get the minimum valid position in a set of info objects. */
-        private int getMinPos(Info... values) {
-            int i = Integer.MAX_VALUE;
-            for (Info info: values) {
-                if (info.start >= 0) i = Math.min(i, info.start);
-                if (info.pos   >= 0) i = Math.min(i, info.pos);
-                if (info.end   >= 0) i = Math.min(i, info.end);
-            }
-            return (i == Integer.MAX_VALUE) ? 0 : i;
-        }
-
-        /** Set the background on a component. */
-        private JComponent setBackground(JComponent comp, Color c) {
-            comp.setOpaque(true);
-            comp.setBackground(c);
-            return comp;
-        }
-
-        /** Scroll a text area to display a given position near the middle of the visible area. */
-        private void scroll(final JTextArea t, final int pos) {
-            // Using invokeLater appears to give text a chance to sort itself out
-            // before the scroll happens; otherwise scrollRectToVisible doesn't work.
-            // Maybe there's a better way to sync with the text...
-            EventQueue.invokeLater(new Runnable() {
-                public void run() {
-                    try {
-                        Rectangle r = t.modelToView(pos);
-                        JScrollPane p = (JScrollPane) SwingUtilities.getAncestorOfClass(JScrollPane.class, t);
-                        r.y = Math.max(0, r.y - p.getHeight() * 2 / 5);
-                        r.height += p.getHeight() * 4 / 5;
-                        t.scrollRectToVisible(r);
-                    } catch (BadLocationException ignore) {
-                    }
-                }
-            });
-        }
-
-        private JComboBox entries;
-        private JTextField checkField;
-        private InfoPanel enclPanel;
-        private InfoPanel selfPanel;
-        private JTextArea body;
-        private JTextField statusText;
-
-        private Color selfColor = new Color(0.f, 1.f, 0.f, 0.2f); // 20% green
-        private Color enclColor = new Color(1.f, 0.f, 0.f, 0.2f); // 20% red
-
-        /** Panel to display an Info object. */
-        private class InfoPanel extends JPanel {
-            InfoPanel() {
-                add(tagName = createTextField(20));
-                add(new JLabel("start:"));
-                add(addListener(start = createTextField(6)));
-                add(new JLabel("pos:"));
-                add(addListener(pos = createTextField(6)));
-                add(new JLabel("end:"));
-                add(addListener(end = createTextField(6)));
-            }
-
-            void setInfo(Info info) {
-                this.info = info;
-                tagName.setText(tagNames.get(info.tag));
-                start.setText(String.valueOf(info.start));
-                pos.setText(String.valueOf(info.pos));
-                end.setText(String.valueOf(info.end));
-            }
-
-            JTextField addListener(final JTextField f) {
-                f.addMouseListener(new MouseAdapter() {
-                    @Override
-                    public void mouseClicked(MouseEvent e) {
-                        body.setCaretPosition(Integer.valueOf(f.getText()));
-                        body.getCaret().setVisible(true);
-                    }
-                });
-                return f;
-            }
-
-            Info info;
-            JTextField tagName;
-            JTextField start;
-            JTextField pos;
-            JTextField end;
-        }
-
-        /** Object to record information about an error to be displayed. */
-        private class Entry {
-            Entry(JavaFileObject file, String check, Info encl, Info self) {
-                this.file = file;
-                this.check = check;
-                this.encl = encl;
-                this.self= self;
-            }
-
-            @Override
-            public String toString() {
-                return file.getName() + " " + check + " " + getMinPos(encl, self);
-            }
-
-            final JavaFileObject file;
-            final String check;
-            final Info encl;
-            final Info self;
-        }
-    }
-}
-