Bug 510794 - Tab character is ignored at the beginning of line inside a

raw string literal

Change-Id: Idc8dfba8900495933f681f809dc96c4d92a6db8a

core/org.eclipse.cdt.ui.tests/resources/indentation/rawString/After.cpp

@@ -0,0 +1,3 @@
+const char* s = R"(
+ 	 Some text
+)";

core/org.eclipse.cdt.ui.tests/resources/indentation/rawString/Before.cpp

@@ -0,0 +1,3 @@
+const char* s = R"(
+  Some text
+)";

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

@@ -8,16 +8,12 @@
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *     Anton Leherbauer (Wind River Systems)
+ *     Sergey Prigogin (Google)
  *******************************************************************************/
 package org.eclipse.cdt.ui.tests.text;
 
 import java.util.ListResourceBundle;
 
-import junit.extensions.TestSetup;
-import junit.framework.Test;
-import junit.framework.TestCase;
-import junit.framework.TestSuite;
-
 import org.eclipse.jface.text.IDocument;
 import org.eclipse.jface.text.source.SourceViewer;
 
@@ -31,6 +27,11 @@ import org.eclipse.cdt.ui.testplugin.ResourceTestHelper;
 import org.eclipse.cdt.internal.ui.actions.IndentAction;
 import org.eclipse.cdt.internal.ui.editor.CEditor;
 
+import junit.extensions.TestSetup;
+import junit.framework.Test;
+import junit.framework.TestCase;
+import junit.framework.TestSuite;
+
 /**
  * Test the IndentAction.
  */
@@ -89,11 +90,11 @@ public class IndentActionTest extends TestCase {
 		EditorTestHelper.closeEditor(fEditor);
 	}
 
-	private void assertIndentResult() throws Exception {
+	private void assertIndentResult(boolean isTabAction) throws Exception {
 		String afterFile= createFileName("After");
 		String expected= ResourceTestHelper.read(afterFile).toString();
 
-		new IndentAction(new EmptyBundle(), "prefix", fEditor, false).run();
+		new IndentAction(new EmptyBundle(), "prefix", fEditor, isTabAction).run();
 
 		assertEquals(expected, fDocument.get());
 	}
@@ -110,16 +111,22 @@ public class IndentActionTest extends TestCase {
 
 	public void testUnchanged() throws Exception {
 		selectAll();
-		assertIndentResult();
+		assertIndentResult(false);
 	}
 
 	public void testSample() throws Exception {
 		selectAll();
-		assertIndentResult();
+		assertIndentResult(false);
 	}
 
 	public void testComplex() throws Exception {
 		selectAll();
-		assertIndentResult();
+		assertIndentResult(false);
+	}
+
+	// See http://bugs.eclipse.org/510794
+	public void testRawString() throws Exception {
+		fSourceViewer.setSelectedRange(fDocument.getLineOffset(1) + 1, 0);
+		assertIndentResult(true);
 	}
 }

core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/actions/IndentAction.java

@@ -7,7 +7,7 @@
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
- *     Sergey Prigogin, Google
+ *     Sergey Prigogin (Google)
  *     Anton Leherbauer (Wind River Systems)
  *******************************************************************************/
 package org.eclipse.cdt.internal.ui.actions;
@@ -212,8 +212,27 @@ public class IndentAction extends TextEditorAction {
 			} else if (startingPartition.getType().equals(ICPartitions.C_PREPROCESSOR)) {
 				indent= computePreprocessorIndent(document, line, startingPartition);
 			} else if (startingPartition.getType().equals(ICPartitions.C_STRING) && offset > startingPartition.getOffset()) {
-				// don't indent inside (raw-)string
+				// Don't indent inside (raw-)string, but if the indent action was triggered by a Tab key,
-				return false;
+				// insert a '\t' character or spaces at the caret position.
+				if (!fIsTabAction)
+					return false;
+
+				String text = "\t"; //$NON-NLS-1$
+				if (useSpaces()) {
+					int tabSize = getTabSize();
+					if (tabSize == 0)
+						return false;
+
+					int numSpaces = tabSize - (caret - offset) % tabSize;
+					StringBuilder buf = new StringBuilder(numSpaces);
+					for (int i = 0; i < numSpaces; i++) {
+						buf.append(' ');
+					}
+					text = buf.toString();
+				}
+				document.replace(caret, 0, text);
+				fCaretOffset= caret + text.length();
+				return true;
 			} else if (!fIsTabAction && startingPartition.getOffset() == offset && startingPartition.getType().equals(ICPartitions.C_SINGLE_LINE_COMMENT)) {
 				// line comment starting at position 0 -> indent inside
 				if (indentInsideLineComments()) {