Fix and test for 193461: [Editor] double-click to select the first word of a file does not work

core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/CWordFinderTest.java

@@ -0,0 +1,70 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Wind River Systems, Inc. and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Anton Leherbauer (Wind River Systems) - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.cdt.ui.tests.text;
+
+import junit.framework.TestSuite;
+
+import org.eclipse.jface.text.BadLocationException;
+import org.eclipse.jface.text.Document;
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.IRegion;
+
+import org.eclipse.cdt.ui.tests.BaseUITestCase;
+
+import org.eclipse.cdt.internal.ui.text.CWordFinder;
+
+/**
+ * Tests for CWordFinder.
+ */
+public class CWordFinderTest extends BaseUITestCase {
+
+	public static TestSuite suite() {
+		return suite(CWordFinderTest.class, "_");
+	}
+
+	protected void setUp() throws Exception {
+		super.setUp();
+	}
+
+	protected void tearDown() throws Exception {
+		super.tearDown();
+	}
+
+	public void testFindWord() throws BadLocationException {
+		IDocument doc= new Document();
+		StringBuffer buf= new StringBuffer();
+		String word= "word_0815";
+		for (int i= 0; i < 10; i++) {
+			buf.append(' ').append(word);
+		}
+		doc.set(buf.toString());
+		for (int i= 0; i < doc.getLength(); i++) {
+			IRegion wordRegion= CWordFinder.findWord(doc, i);
+			assertNotNull(wordRegion);
+			if (wordRegion.getLength() != 0) {
+				assertEquals(word.length(), wordRegion.getLength());
+				assertEquals(word, doc.get(wordRegion.getOffset(), wordRegion.getLength()));
+			}
+		}
+	}
+
+	public void testFindWordOnDocumentStart_Bug193461() {
+		IDocument doc= new Document();
+		doc.set("word");
+		for (int i= 0; i < doc.getLength(); i++) {
+			IRegion wordRegion= CWordFinder.findWord(doc, i);
+			assertNotNull(wordRegion);
+			assertEquals(doc.getLength(), wordRegion.getLength());
+			assertEquals(0, wordRegion.getOffset());
+		}
+	}
+}

core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/TextTestSuite.java

@@ -54,5 +54,8 @@ public class TextTestSuite extends TestSuite {
 		
 		// editor hyperlink tests
 		addTest(HyperlinkTest.suite());
+
+		// word detection
+		addTest(CWordFinderTest.suite());
     }
 }

core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/text/CWordFinder.java

@@ -46,7 +46,7 @@ public class CWordFinder {
 	 *         error accessing the docment data.
 	 */
 	public static IRegion findWord(IDocument document, int offset) {
-		int start = -1;
+		int start = -2;
 		int end = -1;
 
 		try {
@@ -77,7 +77,7 @@ public class CWordFinder {
 		} catch (BadLocationException x) {
 		}
 
-		if (start > -1 && end > -1) {
+		if (start >= -1 && end > -1) {
 			if (start == offset && end == offset)
 				return new Region(offset, 0);
 			else if (start == offset)