javax.swing.text.PlainDocument Java Examples

/**
 * Return the line of text at the given position.  The returned value may
 * be null.  It will not contain the trailing new-line character.
 * @param target the text component
 * @param pos char position
 * @return
 */
public static String getLineAt(JTextComponent target, int pos) {
    String line = null;
    Document doc = target.getDocument();
    if (doc instanceof PlainDocument) {
        PlainDocument pDoc = (PlainDocument) doc;
        int start = pDoc.getParagraphElement(pos).getStartOffset();
        int end = pDoc.getParagraphElement(pos).getEndOffset();
        try {
            line = doc.getText(start, end - start);
            if (line != null && line.endsWith("\n")) {
                line = line.substring(0, line.length() - 1);
            }
        } catch (BadLocationException ex) {
            Logger.getLogger(ActionUtils.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
    return line;
}
 

public void testSimple() {
    PlainDocument doc = new PlainDocument();
    HighlightsContainer layer = createRandomBag(doc, "layer");
    HighlightsSequence highlights = layer.getHighlights(0, 100);
    
    ProxyHighlightsContainer proxyLayer = new ProxyHighlightsContainer(doc, new HighlightsContainer [] { layer });
    HighlightsSequence proxyHighlights = proxyLayer.getHighlights(0, 100);

    for ( ; highlights.moveNext(); ) {
        // Ignore empty highlights
        if (highlights.getStartOffset() == highlights.getEndOffset()) {
            continue;
        }

        assertTrue("Wrong number of proxy highlights", proxyHighlights.moveNext());

        assertEquals("Start offset does not match", highlights.getStartOffset(), proxyHighlights.getStartOffset());
        assertEquals("End offset does not match", highlights.getEndOffset(), proxyHighlights.getEndOffset());
        assertTrue("Attributes do not match", highlights.getAttributes().isEqual(proxyHighlights.getAttributes()));
    }
}
 

/**
 * Return the lines that span the selection (split as an array of Strings)
 * if there is no selection then current line is returned.
 * 
 * Note that the strings returned will not contain the terminating line feeds
 * 
 * The text component will then have the full lines set as selection
 * @param target
 * @return String[] of lines spanning selection / or Dot
 */
public static String[] getSelectedLines(JTextComponent target) {
    String[] lines = null;
    try {
        PlainDocument pDoc = (PlainDocument) target.getDocument();
        int start = pDoc.getParagraphElement(target.getSelectionStart()).getStartOffset();
        int end;
        if (target.getSelectionStart() == target.getSelectionEnd()) {
            end = pDoc.getParagraphElement(target.getSelectionEnd()).getEndOffset();
        } else {
            // if more than one line is selected, we need to subtract one from the end
            // so that we do not select the line with the caret and no selection in it
            end = pDoc.getParagraphElement(target.getSelectionEnd() - 1).getEndOffset();
        }
        target.select(start, end);
        lines = pDoc.getText(start, end - start).split("\n");
        target.select(start, end);
    } catch (BadLocationException ex) {
        Logger.getLogger(ActionUtils.class.getName()).log(Level.SEVERE, null, ex);
        lines = EMPTY_STRING_ARRAY;
    }
    return lines;
}
 

/**
 * Return the line of text at the given position. The returned value may
 * be null. It will not contain the trailing new-line character.
 * 
 * @param doc
 * @param pos
 * @return
 */
public static String getLineAt(PlainDocument doc, int pos) {
    String line = null;
    int start = doc.getParagraphElement(pos).getStartOffset();
    int end = doc.getParagraphElement(pos).getEndOffset();
    try {
        line = doc.getText(start, end - start);
        if (line != null && line.endsWith("\n")) {
            line = line.substring(0, line.length() - 1);
        }
    } catch (BadLocationException e) {
        LOG.error(e.getMessage(), e);
    }
    
    return line;
}
 

private MyTextField() {
  super(40);
  enableEvents(AWTEvent.KEY_EVENT_MASK);
  myCompletionKeyStroke = getShortcut(IdeActions.ACTION_CODE_COMPLETION);
  forwardStroke = getShortcut(IdeActions.ACTION_GOTO_FORWARD);
  backStroke = getShortcut(IdeActions.ACTION_GOTO_BACK);
  setFocusTraversalKeysEnabled(false);
  putClientProperty("JTextField.variant", "search");
  setDocument(new PlainDocument() {
    @Override
    public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
      super.insertString(offs, str, a);
      if (str != null && str.length() > 1) {
        handlePaste(str);
      }
    }
  });
}
 

public void testExcludeTwoLayers() {
    OffsetsBag bag = new OffsetsBag(new PlainDocument());
    
    MemoryMimeDataProvider.reset(null);
    MemoryMimeDataProvider.addInstances(
        "text/plain", new SingletonLayerFactory("layer", ZOrder.DEFAULT_RACK, true, bag));

    JEditorPane pane = new JEditorPane();
    String [] removed = new String[] {"^org\\.netbeans\\.modules\\.editor\\.lib2\\.highlighting\\..*$", "^org\\.netbeans\\.modules\\.editor\\.lib2\\.highlighting\\.TextSelectionHighlighting$"};
    pane.putClientProperty("HighlightsLayerExcludes", removed);
    pane.setContentType("text/plain");
    assertEquals("The pane has got wrong mime type", "text/plain", pane.getContentType());
    
    HighlightingManager hm = HighlightingManager.getInstance(pane);
    HighlightsContainer hc = hm.getHighlights(HighlightsLayerFilter.IDENTITY);

    assertNotNull("Can't get fixed HighlightsContainer", hc);
    assertFalse("There should be no fixed highlights", hc.getHighlights(0, Integer.MAX_VALUE).moveNext());
}
 

private PositionsBag mergeContainers(boolean merge, String [] layerNames, HighlightsContainer[] containers) {
    PositionsBag bag = new PositionsBag(new PlainDocument(), merge);

    for (int i = 0; i < containers.length; i++) {
        HighlightsSequence layerHighlights = 
            containers[i].getHighlights(START, END);
        
        for ( ; layerHighlights.moveNext(); ) {
            bag.addHighlight(
                new SimplePosition(layerHighlights.getStartOffset()), 
                new SimplePosition(layerHighlights.getEndOffset()), 
                layerHighlights.getAttributes());
        }
    }
    
    return bag;
}
 

public void testCuriosities() throws Exception {
    // Test position at offset 0 does not move after insert
    Document doc = new PlainDocument();
    doc.insertString(0, "test", null);
    Position pos = doc.createPosition(0);
    assertEquals(0, pos.getOffset());
    doc.insertString(0, "a", null);
    assertEquals(0, pos.getOffset());
    
    // Test there is an extra newline above doc.getLength()
    assertEquals("\n", doc.getText(doc.getLength(), 1));
    assertEquals("atest\n", doc.getText(0, doc.getLength() + 1));
    
    // Test the last line element contains the extra newline
    Element lineElem = doc.getDefaultRootElement().getElement(0);
    assertEquals(0, lineElem.getStartOffset());
    assertEquals(doc.getLength() + 1, lineElem.getEndOffset());

    // Test that once position gets to zero it won't go anywhere else (unless undo performed)
    pos = doc.createPosition(1);
    doc.remove(0, 1);
    assertEquals(0, pos.getOffset());
    doc.insertString(0, "b", null);
    assertEquals(0, pos.getOffset());
}
 

public void testEvents() {
    PlainDocument doc = new PlainDocument();
    PositionsBag hsA = new PositionsBag(doc);
    PositionsBag hsB = new PositionsBag(doc);
    
    ProxyHighlightsContainer chc = new ProxyHighlightsContainer(doc, new HighlightsContainer [] { hsA, hsB });
    Listener listener = new Listener();
    chc.addHighlightsChangeListener(listener);
    
    hsA.addHighlight(new SimplePosition(10), new SimplePosition(20), new SimpleAttributeSet());
    assertEquals("Wrong number of events", 1, listener.eventsCnt);
    assertEquals("Wrong change start offset", 10, listener.lastEventStartOffset);
    assertEquals("Wrong change end offset", 20, listener.lastEventEndOffset);

    listener.reset();
    hsB.addHighlight(new SimplePosition(11), new SimplePosition(12), new SimpleAttributeSet());
    assertEquals("Wrong number of events", 1, listener.eventsCnt);
    assertEquals("Wrong change start offset", 11, listener.lastEventStartOffset);
    assertEquals("Wrong change end offset", 12, listener.lastEventEndOffset);
}
 

/**
 * Return the lines that span the selection (split as an array of Strings)
 * if there is no selection then current line is returned.
 *
 * Note that the strings returned will not contain the terminating line feeds
 * If the document is empty, then an empty string array is returned.  So
 * you can always iterate over the returned array without a null check
 *
 * The text component will then have the full lines set as selection
 * @param target
 * @return String[] of lines spanning selection / or line containing dot
 */
public static String[] getSelectedLines(JTextComponent target) {
	String[] lines = null;
	try {
		PlainDocument pDoc = (PlainDocument) target.getDocument();
		int start = pDoc.getParagraphElement(target.getSelectionStart()).getStartOffset();
		int end;
		if (target.getSelectionStart() == target.getSelectionEnd()) {
			end = pDoc.getParagraphElement(target.getSelectionEnd()).getEndOffset();
		} else {
			// if more than one line is selected, we need to subtract one from the end
			// so that we do not select the line with the caret and no selection in it
			end = pDoc.getParagraphElement(target.getSelectionEnd() - 1).getEndOffset();
		}
		target.select(start, end);
		lines = pDoc.getText(start, end - start).split("\n");
		target.select(start, end);
	} catch (BadLocationException ex) {
		Logger.getLogger(ActionUtils.class.getName()).log(Level.SEVERE, null, ex);
		lines = EMPTY_STRING_ARRAY;
	}
	return lines;
}
 

public void actionPerformed(ActionEvent e) {
    JTextComponent target = getTextComponent(e);
    Integer tabStop = (Integer) target.getDocument().getProperty(PlainDocument.tabSizeAttribute);
    String indent = ActionUtils.SPACES.substring(0, tabStop);
    if (target != null) {
        String[] lines = ActionUtils.getSelectedLines(target);
        int start = target.getSelectionStart();
        StringBuilder sb = new StringBuilder();
        for (String line : lines) {
            if (line.startsWith(indent)) {
                sb.append(line.substring(indent.length()));
            } else if (line.startsWith("\t")) {
                sb.append(line.substring(1));
            } else {
                sb.append(line);
            }
            sb.append('\n');
        }
        target.replaceSelection(sb.toString());
        target.select(start, start + sb.length());
    }
}
 

@Test
public void testPos() throws Exception {
    Document doc = new PlainDocument();
    doc.insertString(0, "\t\t\n\n", null);
    Position pos1 = doc.createPosition(1);
    Position pos2 = doc.createPosition(2);
    
    Position pos10 = ComplexPositions.create(pos1, 0);
    Position pos11 = ComplexPositions.create(pos1, 1);
    Position pos20 = ComplexPositions.create(pos2, 0);
    Position pos21 = ComplexPositions.create(pos2, 1);
    
    assertEquals(0, ComplexPositions.getSplitOffset(pos1));
    assertEquals(0, ComplexPositions.getSplitOffset(pos10));
    assertEquals(1, ComplexPositions.getSplitOffset(pos11));
    comparePos(pos1, pos10, 0);
    comparePos(pos10, pos11, -1);
    comparePos(pos1, pos2, -1);
    comparePos(pos10, pos20, -1);
    comparePos(pos20, pos21, -1);
}
 

/**
 * Check a token list with writing.
 *
 * @param documentContent
 * @param offset
 * @param text
 * @param startOffset
 * @param golden expected words
 * @throws Exception
 */
private void tokenListTestWithWriting(String documentContent, int offset, String text, int startOffset, String... golden) throws Exception {
    Document doc = new PlainDocument();
    doc.putProperty(Language.class, PHPTokenId.language());
    doc.insertString(0, PHPTAG + documentContent, null);
    List<String> words = new ArrayList<>();
    TokenList tokenList = new PHPTokenList(doc);
    while (tokenList.nextWord()) {
    }

    doc.insertString(offset + PHPTAG.length(), text, null);
    tokenList.setStartOffset(startOffset + PHPTAG.length());
    while (tokenList.nextWord()) {
        words.add(tokenList.getCurrentWordText().toString());
    }
    assertEquals(Arrays.asList(golden), words);
}
 

public void testOrdering() {
    PlainDocument doc = new PlainDocument();
    PositionsBag hsA = new PositionsBag(doc);
    PositionsBag hsB = new PositionsBag(doc);

    SimpleAttributeSet attribsA = new SimpleAttributeSet();
    SimpleAttributeSet attribsB = new SimpleAttributeSet();
    
    attribsA.addAttribute("attribute", "value-A");
    attribsB.addAttribute("attribute", "value-B");
    
    hsA.addHighlight(new SimplePosition(5), new SimplePosition(15), attribsA);
    hsB.addHighlight(new SimplePosition(10), new SimplePosition(20), attribsB);
    
    CompoundHighlightsContainer chc = new CompoundHighlightsContainer(doc, new HighlightsContainer [] { hsA, hsB });
    HighlightsSequence highlights = chc.getHighlights(0, Integer.MAX_VALUE);

    assertTrue("Wrong number of highlights", highlights.moveNext());
    assertEquals("1. highlight - wrong attribs", "value-A", highlights.getAttributes().getAttribute("attribute"));

    assertTrue("Wrong number of highlights", highlights.moveNext());
    assertEquals("2. highlight - wrong attribs", "value-B", highlights.getAttributes().getAttribute("attribute"));

    assertTrue("Wrong number of highlights", highlights.moveNext());
    assertEquals("3. highlight - wrong attribs", "value-B", highlights.getAttributes().getAttribute("attribute"));
}
 

public void testConcurrentModification() throws Exception {
    PlainDocument doc = new PlainDocument();
    PositionsBag bag = createRandomBag(doc, "layer");
    HighlightsContainer [] layers = new HighlightsContainer [] { bag };
    
    CompoundHighlightsContainer hb = new CompoundHighlightsContainer(doc, layers);
    HighlightsSequence hs = hb.getHighlights(0, Integer.MAX_VALUE);
    
    assertTrue("No highlights", hs.moveNext());
    int s = hs.getStartOffset();
    int e = hs.getEndOffset();
    AttributeSet a = hs.getAttributes();

    // Change the layers
    hb.setLayers(doc, layers);
    
    assertEquals("Different startOffset", s, hs.getStartOffset());
    assertEquals("Different endOffset", e, hs.getEndOffset());
    assertEquals("Different attributes", a, hs.getAttributes());
    
    assertFalse("There should be no further highlighs after co-modification", hs.moveNext());
}
 

/**
 * Return the line of text at the given position.  The returned value may
 * be null.  It will not contain the trailing new-line character.
 * @param target the text component
 * @param pos char position
 * @return
 */
public static String getLineAt(JTextComponent target, int pos) {
	String line = null;
	Document doc = target.getDocument();
	if (doc instanceof PlainDocument) {
		PlainDocument pDoc = (PlainDocument) doc;
		int start = pDoc.getParagraphElement(pos).getStartOffset();
		int end = pDoc.getParagraphElement(pos).getEndOffset();
		try {
			line = doc.getText(start, end - start);
			if (line != null && line.endsWith("\n")) {
				line = line.substring(0, line.length() - 1);
			}
		} catch (BadLocationException ex) {
			Logger.getLogger(ActionUtils.class.getName()).log(Level.SEVERE, null, ex);
		}
	}
	return line;
}
 

public void testEvents() {
    PlainDocument doc = new PlainDocument();
    PositionsBag hsA = new PositionsBag(doc);
    PositionsBag hsB = new PositionsBag(doc);
    
    CompoundHighlightsContainer chc = new CompoundHighlightsContainer(doc, new HighlightsContainer [] { hsA, hsB });
    Listener listener = new Listener();
    chc.addHighlightsChangeListener(listener);
    
    hsA.addHighlight(new SimplePosition(10), new SimplePosition(20), new SimpleAttributeSet());
    assertEquals("Wrong number of events", 1, listener.eventsCnt);
    assertEquals("Wrong change start offset", 10, listener.lastEventStartOffset);
    assertEquals("Wrong change end offset", 20, listener.lastEventEndOffset);

    listener.reset();
    hsB.addHighlight(new SimplePosition(11), new SimplePosition(12), new SimpleAttributeSet());
    assertEquals("Wrong number of events", 1, listener.eventsCnt);
    assertEquals("Wrong change start offset", 11, listener.lastEventStartOffset);
    assertEquals("Wrong change end offset", 12, listener.lastEventEndOffset);
}
 

public void testEvents2() {
    PlainDocument doc = new PlainDocument();
    PositionsBag hsA = new PositionsBag(doc);
    PositionsBag hsB = new PositionsBag(doc);

    hsA.addHighlight(new SimplePosition(10), new SimplePosition(20), new SimpleAttributeSet());
    hsB.addHighlight(new SimplePosition(11), new SimplePosition(12), new SimpleAttributeSet());

    CompoundHighlightsContainer chc = new CompoundHighlightsContainer();
    Listener listener = new Listener();
    chc.addHighlightsChangeListener(listener);

    // changing delegate layers fires event covering 'all' offsets
    chc.setLayers(doc, new HighlightsContainer [] { hsA, hsB });
    assertEquals("Wrong number of events", 1, listener.eventsCnt);
    assertEquals("Wrong change start offset", 0, listener.lastEventStartOffset);
    assertEquals("Wrong change end offset", Integer.MAX_VALUE, listener.lastEventEndOffset);
}
 

public void testAddWeakPropertyChangeListenerSupported() {
    SampleListener sl = new SampleListener();
    // This simulates the construction of the BaseDocument
    PlainDocument pd = new PlainDocument();
    PropertyChangeSupport pcs = new PropertyChangeSupport(pd);
    pd.putProperty(PropertyChangeSupport.class, pcs);

    PropertyChangeListener weakListener = DocumentUtilities.addWeakPropertyChangeListener(pd, sl);
    // A PropertyChangeListener added through addWeakPropertyChangeListener
    // to a PropertyChangeListener supporting document, must be reflected
    // in a non-null return value
    assertNotNull(weakListener);

    // the backing listner needs to be invoked when a property is changed
    pcs.firePropertyChange("demoProperty", null, "demoValue");
    assertEquals(1, sl.getCallCount("demoProperty"));

    // The returned Listner must be usable for listener removal
    DocumentUtilities.removePropertyChangeListener(pd, weakListener);
    sl.reset();
    pcs.firePropertyChange("demoProperty", null, "demoValue");
    assertEquals(0, sl.getCallCount("demoProperty"));

}
 

public SyntaxDocument(Lexer lexer) {
    super();
    putProperty(PlainDocument.tabSizeAttribute, 4); // outside ?!
    this.lexer = lexer;
    
    // Listen for undo and redo events
    addUndoableEditListener(new UndoableEditListener() {

        public void undoableEditHappened(UndoableEditEvent event) {
            if (event.getEdit().isSignificant()) {
                undo.addEdit(event.getEdit());
            }
        }
        
    });
}
 

public void testZeroPosition() throws BadLocationException {
    PlainDocument doc = new PlainDocument();
    TestHighlighsContainer thc = new TestHighlighsContainer();
    CompoundHighlightsContainer chc = new CompoundHighlightsContainer();

    chc.setLayers(doc, new HighlightsContainer[] { thc });
    doc.insertString(0, "0123456789", null);

    chc.getHighlights(0, Integer.MAX_VALUE);
    assertEquals("Should have been queried", 2, thc.queries.size());
    assertEquals("Wrong query startOffset", 0, (int) thc.queries.get(0));

    thc.queries.clear();
    doc.insertString(0, "abcd", null);
    assertEquals("Should not have been queried", 0, thc.queries.size());

    chc.getHighlights(0, Integer.MAX_VALUE);
    assertEquals("Should have been queried again", 2, thc.queries.size());
    assertEquals("Wrong query startOffset", 0, (int) thc.queries.get(0));

    thc.queries.clear();
    chc.getHighlights(0, Integer.MAX_VALUE);
    assertEquals("Should not have been queried again", 0, thc.queries.size());
}
 

private Document createCBTextFieldDocument() {
    Document doc = new PlainDocument();
    String valueType = evaluator.getProperty(JNLP_CBASE_TYPE);
    String docString = "";
    if (CB_TYPE_LOCAL.equals(valueType)) {
        docString = getProjectDistDir();
    } else if (CB_TYPE_WEB.equals(valueType)) {
        docString = CB_URL_WEB;
    } else if (CB_TYPE_USER.equals(valueType)) {
        docString = getCodebaseLocation();
    }
    try {
        doc.insertString(0, docString, null);
    } catch (BadLocationException ex) {
        // do nothing, just return PlainDocument
        // XXX log the exc
    }
    return doc;
}
 

public void testOffset0Forward() throws Exception {
    Document doc = new PlainDocument();
    WordMatch wordMatch = WordMatch.get(doc);
    //                   012345678901234567890123456789
    doc.insertString(0, "abc abc dab ab a abab+c", null);
    int docLen = doc.getLength();
    wordMatch.matchWord(0, true);
    compareText(doc, 0, "abca", docLen + 3);
    wordMatch.matchWord(0, true);
    compareText(doc, 0, "daba", docLen + 3);
    wordMatch.matchWord(0, true);
    compareText(doc, 0, "aba", docLen + 2);
    wordMatch.matchWord(0, true);
    compareText(doc, 0, "aa", docLen + 1);
    wordMatch.matchWord(0, true);
    compareText(doc, 0, "ababa", docLen + 4);
    wordMatch.matchWord(0, true);
    compareText(doc, 0, "ca", docLen + 1);
    wordMatch.matchWord(0, true);
    compareText(doc, 0, "ca", docLen + 1);

    wordMatch.matchWord(0, false);
    compareText(doc, 0, "ababa", docLen + 4);
}
 

public void testOffsetDocLenBackward() throws Exception {
    Document doc = new PlainDocument();
    WordMatch wordMatch = WordMatch.get(doc);
    //                   012345678901234567890123456789
    doc.insertString(0, "abc abc dab ab a", null);
    int docLen = doc.getLength();
    wordMatch.matchWord(docLen, false);
    compareText(doc, docLen - 1, "ab", docLen + 1);
    wordMatch.matchWord(docLen, false);
    compareText(doc, docLen - 1, "abc", docLen + 2);
    wordMatch.matchWord(docLen, false);
    compareText(doc, docLen - 1, "abc", docLen + 2);

    wordMatch.matchWord(docLen, true);
    compareText(doc, docLen - 1, "ab", docLen + 1);
    wordMatch.matchWord(docLen, true);
    compareText(doc, docLen - 1, "a", docLen);
}
 

public void testUTF8() throws Exception {
    clearWorkDir();

    FileObject grammar = FileUtil.createData(FileUtil.getConfigRoot(), "Editors/text/test/grammar.json");
    try (OutputStream out = grammar.getOutputStream();
         Writer w = new OutputStreamWriter(out)) {
        w.write("{ \"scopeName\": \"test\", " +
                " \"patterns\": [\n" + 
                "  { \"name\": \"ident.test\",\n" +
                "    \"match\": \"[^ ]+\"\n" +
                "   }\n" +
                "]}\n");
    }
    grammar.setAttribute(LanguageHierarchyImpl.GRAMMAR_MARK, "test");
    Document doc = new PlainDocument();
    doc.insertString(0, " večerníček večerníček  ", null);
    doc.putProperty(Language.class, new LanguageHierarchyImpl("text/test", "test").language());
    TokenHierarchy<Document> hi = TokenHierarchy.get(doc);
    TokenSequence<?> ts = hi.tokenSequence();
    LexerTestUtilities.assertNextTokenEquals(ts, TextmateTokenId.TEXTMATE, " ");
    assertTokenProperties(ts, "test");
    LexerTestUtilities.assertNextTokenEquals(ts, TextmateTokenId.TEXTMATE, "večerníček");
    assertTokenProperties(ts, "test", "ident.test");
    LexerTestUtilities.assertNextTokenEquals(ts, TextmateTokenId.TEXTMATE, " ");
    assertTokenProperties(ts, "test");
    LexerTestUtilities.assertNextTokenEquals(ts, TextmateTokenId.TEXTMATE, "večerníček");
    assertTokenProperties(ts, "test", "ident.test");
    LexerTestUtilities.assertNextTokenEquals(ts, TextmateTokenId.TEXTMATE, "  ");
    assertTokenProperties(ts, "test");
    LexerTestUtilities.assertNextTokenEquals(ts, TextmateTokenId.TEXTMATE, "\n");
    assertFalse(ts.moveNext());
}
 

public void testAddWeakPropertyChangeListenerUnsupported() {
    // It is expected, that if the backing document does not support
    // PropertyChangeListener (PlainDocument), null is returned
    SampleListener sl = new SampleListener();
    PlainDocument pd = new PlainDocument();
    PropertyChangeListener weakListener = DocumentUtilities.addWeakPropertyChangeListener(pd, sl);
    assertNull(weakListener);
}
 

public void testMultiDocs() throws Exception {
    JEditorPane pane = new JEditorPane();
    pane.setText("abc ax ec ajo");
    JFrame frame = new JFrame();
    frame.getContentPane().add(pane);
    frame.pack(); // Allows to EditorRegistry.register() to make an item in the component list
    EditorApiPackageAccessor.get().setIgnoredAncestorClass(JEditorPane.class);
    EditorApiPackageAccessor.get().register(pane);
    
    Document doc = new PlainDocument();
    WordMatch wordMatch = WordMatch.get(doc);
    //                   012345678901234567890123456789
    doc.insertString(0, "abc a x ahoj", null);
    int docLen = doc.getLength();
    int offset = 5;
    wordMatch.matchWord(offset, false);
    compareText(doc, offset - 1, "abc ", docLen + 2);
    wordMatch.matchWord(offset, false);
    compareText(doc, offset - 1, "ahoj ", docLen + 3);
    wordMatch.matchWord(offset, false);
    compareText(doc, offset - 1, "ax ", docLen + 1);
    wordMatch.matchWord(offset, false);
    compareText(doc, offset - 1, "ajo ", docLen + 2);
    wordMatch.matchWord(offset, false);
    compareText(doc, offset - 1, "ajo ", docLen + 2);
    pane.setText(""); // Ensure this doc would affect WordMatch for other docs
}
 

public void testGetText() throws Exception {
    PlainDocument doc = new PlainDocument();
    CharSequence text = DocumentUtilities.getText(doc);
    assertEquals(1, text.length());
    assertEquals('\n', text.charAt(0));

    text = DocumentUtilities.getText(doc);
    doc.insertString(0, "a\nb", null);
    for (int i = 0; i < doc.getLength() + 1; i++) {
        assertEquals(doc.getText(i, 1).charAt(0), text.charAt(i));
    }
}
 

protected @Override void setUp() {
        cnt = this.getTestNumber();
        bag = new PositionsBag(new PlainDocument(), false);
        
        for(int i = 0; i < cnt; i++) {
            bag.addHighlight(new SimplePosition(i * 10), new SimplePosition(i * 10 + 5), SimpleAttributeSet.EMPTY);
        }

        startOffset = 10 * cnt / 5 - 1;
        endOffset = 10 * (cnt/ 5 + 1) - 1;
        
//        System.out.println("cnt = " + cnt + " : startOffset = " + startOffset + " : endOffset = " + endOffset);
    }
 

@Override
protected JComponent init() {
  inputField = new JTextField();
  PlainDocument doc = (PlainDocument) inputField.getDocument();
  doc.setDocumentFilter(filter);
  resetImpl();
  return inputField;
}