Show ZWSP (zero with space) as code mining

bundles/org.eclipse.ui.editors/src/org/eclipse/ui/internal/editors/text/TextEditorDefaultsPreferencePage.java

@@ -68,6 +68,8 @@
 import org.eclipse.jface.viewers.SelectionChangedEvent;
 import org.eclipse.jface.viewers.StructuredSelection;
 import org.eclipse.jface.viewers.TableViewer;
+import org.eclipse.jface.widgets.ButtonFactory;
+import org.eclipse.jface.widgets.WidgetFactory;
 
 import org.eclipse.ui.IWorkbench;
 import org.eclipse.ui.IWorkbenchPreferencePage;
@@ -451,7 +453,9 @@ private OverlayPreferenceStore createDialogOverlayStore() {
 			overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_ENCLOSED_TABS));
 			overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_TRAILING_TABS));
 			overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_CARRIAGE_RETURN));
-			overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_LINE_FEED));
+			 overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_LINE_FEED));
+			overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN,
+					AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_ZW_CHARACTERS));
 			overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.INT, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_WHITESPACE_CHARACTER_ALPHA_VALUE));
 
 			OverlayPreferenceStore.OverlayKey[] keys= new OverlayPreferenceStore.OverlayKey[overlayKeys.size()];
@@ -571,6 +575,15 @@ protected Control createDialogArea(Composite parent) {
 			preference= new Preference(AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_LINE_FEED, "", null); //$NON-NLS-1$
 			addCheckBox(tabularComposite, preference, new BooleanDomain(), 0);
 
+			WidgetFactory.label(SWT.NONE).text(TextEditorMessages.TextEditorDefaultsPreferencePage_zwcharacters)
+					.layoutData(new GridData(SWT.BEGINNING, SWT.CENTER, false, false)).create(tabularComposite);
+			ButtonFactory checkboxFactory = WidgetFactory.button(SWT.CHECK)
+					.supplyLayoutData(() -> new GridData(SWT.CENTER, SWT.CENTER, false, false)).enabled(false);
+			checkboxFactory.create(tabularComposite);
+			preference = new Preference(AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_ZW_CHARACTERS, "", null); //$NON-NLS-1$
+			addCheckBox(tabularComposite, preference, new BooleanDomain(), 0);
+			checkboxFactory.create(tabularComposite);
+
 			Composite alphaComposite= new Composite(composite, SWT.NONE);
 			layout= new GridLayout();
 			layout.numColumns= 2;
@@ -809,6 +822,8 @@ private OverlayPreferenceStore createOverlayStore() {
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_TRAILING_TABS));
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_CARRIAGE_RETURN));
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_LINE_FEED));
+		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN,
+				AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_ZW_CHARACTERS));
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.INT, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_WHITESPACE_CHARACTER_ALPHA_VALUE));
 
 		OverlayPreferenceStore.OverlayKey[] keys= new OverlayPreferenceStore.OverlayKey[overlayKeys.size()];

bundles/org.eclipse.ui.editors/src/org/eclipse/ui/internal/editors/text/TextEditorMessages.java

@@ -159,6 +159,7 @@ private TextEditorMessages() {
 	public static String TextEditorDefaultsPreferencePage_ideographicSpace;
 	public static String TextEditorDefaultsPreferencePage_leading;
 	public static String TextEditorDefaultsPreferencePage_lineFeed;
+	public static String TextEditorDefaultsPreferencePage_zwcharacters;
 	public static String TextEditorDefaultsPreferencePage_range_indicator;
 	public static String TextEditorDefaultsPreferencePage_smartHomeEnd;
 	public static String TextEditorDefaultsPreferencePage_warn_if_derived;

bundles/org.eclipse.ui.editors/src/org/eclipse/ui/internal/editors/text/TextEditorMessages.properties

@@ -61,6 +61,7 @@ TextEditorDefaultsPreferencePage_enrichHover_onClick=Enrich on click
 TextEditorDefaultsPreferencePage_ideographicSpace=Ideographic space ( \u00b0 )
 TextEditorDefaultsPreferencePage_leading=Leading
 TextEditorDefaultsPreferencePage_lineFeed=Line Feed ( \u00b6 )
+TextEditorDefaultsPreferencePage_zwcharacters=Zero-Width Characters
 TextEditorDefaultsPreferencePage_range_indicator=Show &range indicator
 TextEditorDefaultsPreferencePage_warn_if_derived= War&n before editing a derived file
 TextEditorDefaultsPreferencePage_smartHomeEnd= &Smart caret positioning at line start and end

bundles/org.eclipse.ui.editors/src/org/eclipse/ui/texteditor/AbstractDecoratedTextEditorPreferenceConstants.java

@@ -502,7 +502,8 @@ private AbstractDecoratedTextEditorPreferenceConstants() {
 	 * </p>
 	 *
 	 * <p>
-	 * The following preferences can be used for fine-grained configuration when enabled.
+	 * The following preferences can be used for fine-grained configuration when
+	 * enabled.
 	 * </p>
 	 * <ul>
 	 * <li>{@link #EDITOR_SHOW_LEADING_SPACES}</li>
@@ -516,6 +517,7 @@ private AbstractDecoratedTextEditorPreferenceConstants() {
 	 * <li>{@link #EDITOR_SHOW_TRAILING_TABS}</li>
 	 * <li>{@link #EDITOR_SHOW_CARRIAGE_RETURN}</li>
 	 * <li>{@link #EDITOR_SHOW_LINE_FEED}</li>
+	 * <li>{@link #EDITOR_SHOW_ZW_CHARACTERS}</li>
 	 * <li>{@link #EDITOR_WHITESPACE_CHARACTER_ALPHA_VALUE}</li>
 	 * </ul>
 	 *
@@ -647,6 +649,18 @@ private AbstractDecoratedTextEditorPreferenceConstants() {
 	 */
 	public static final String EDITOR_SHOW_LINE_FEED= AbstractTextEditor.PREFERENCE_SHOW_LINE_FEED;
 
+	/**
+	 * A named preference that controls the display of zero-width characters like
+	 * zero-width space. The value is used only if the value of
+	 * {@link #EDITOR_SHOW_WHITESPACE_CHARACTERS} is <code>true</code>.
+	 * <p>
+	 * Value is of type <code>Boolean</code>.
+	 * </p>
+	 *
+	 * @since 3.?
+	 */
+	public static final String EDITOR_SHOW_ZW_CHARACTERS = AbstractTextEditor.PREFERENCE_SHOW_ZW_CHARACTERS;
+
 	/**
 	 * A named preference that controls the alpha value of whitespace characters. The value is used
 	 * only if the value of {@link #EDITOR_SHOW_WHITESPACE_CHARACTERS} is <code>true</code>.
@@ -858,6 +872,7 @@ public static void initializeDefaultValues(IPreferenceStore store) {
 		store.setDefault(EDITOR_SHOW_TRAILING_TABS, true);
 		store.setDefault(EDITOR_SHOW_CARRIAGE_RETURN, true);
 		store.setDefault(EDITOR_SHOW_LINE_FEED, true);
+		store.setDefault(EDITOR_SHOW_ZW_CHARACTERS, true);
 		store.setDefault(EDITOR_WHITESPACE_CHARACTER_ALPHA_VALUE, 80);
 
 		store.setDefault(EDITOR_TEXT_DRAG_AND_DROP_ENABLED, true);

bundles/org.eclipse.ui.workbench.texteditor/plugin.properties

@@ -215,3 +215,5 @@ blockSelectionModeFont.label= Text Editor Block Selection Font
 blockSelectionModeFont.description= The block selection mode font is used by text editors in block (column) mode. A monospace font should be used.
 
 MinimapView.name=Minimap
+
+CodeMining.show.ZWSP=Show ZWSP (Zero-Width Space)

bundles/org.eclipse.ui.workbench.texteditor/plugin.xml

@@ -1491,5 +1491,13 @@
                visible="false">
          </view>
       </perspectiveExtension>
-   </extension>   
+   </extension>
+   <extension
+         point="org.eclipse.ui.workbench.texteditor.codeMiningProviders">
+      <codeMiningProvider
+            class="org.eclipse.ui.internal.texteditor.codemining.ZeroWidthCharactersLineContentCodeMiningProvider"
+            id="org.eclipse.test.codemining.zswpProvider"
+            label="%CodeMining.show.ZWSP">
+      </codeMiningProvider>
+   </extension>
 </plugin>

bundles/org.eclipse.ui.workbench.texteditor/src/org/eclipse/ui/internal/texteditor/codemining/ZeroWidthCharactersLineContentCodeMining.java

@@ -0,0 +1,63 @@
+/*******************************************************************************
+ * Copyright (c) 2025 SAP S.E. and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     SAP S.E. - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.ui.internal.texteditor.codemining;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.custom.StyledText;
+import org.eclipse.swt.graphics.Color;
+import org.eclipse.swt.graphics.GC;
+import org.eclipse.swt.graphics.Point;
+import org.eclipse.swt.widgets.Display;
+
+import org.eclipse.jface.text.Position;
+import org.eclipse.jface.text.codemining.ICodeMiningProvider;
+import org.eclipse.jface.text.codemining.LineContentCodeMining;
+
+/**
+ * A code mining that draws zero-width characters (like zero-width spaces) as
+ * line content code minings.
+ *
+ * @see ZeroWidthCharactersLineContentCodeMiningProvider
+ */
+class ZeroWidthCharactersLineContentCodeMining extends LineContentCodeMining {
+
+	private static final String ZW_CHARACTERS_MINING = "ZWSP"; //$NON-NLS-1$
+
+	public ZeroWidthCharactersLineContentCodeMining(int offset, ICodeMiningProvider provider) {
+		super(new Position(offset, 1), true, provider);
+	}
+
+	@Override
+	public boolean isResolved() {
+		return true;
+	}
+
+	@Override
+	public String getLabel() {
+		return ZW_CHARACTERS_MINING;
+	}
+
+	@Override
+	public Point draw(GC gc, StyledText textWidget, Color color, int x, int y) {
+		gc.setForeground(getColor(color));
+		Point point = super.draw(gc, textWidget, color, x, y);
+		gc.setForeground(color);
+		return point;
+	}
+
+	private Color getColor(Color predefinedColor) {
+		return Display.getCurrent() != null ? Display.getCurrent().getSystemColor(SWT.COLOR_LIST_FOREGROUND)
+				: predefinedColor;
+	}
+}

bundles/org.eclipse.ui.workbench.texteditor/src/org/eclipse/ui/internal/texteditor/codemining/ZeroWidthCharactersLineContentCodeMiningProvider.java

@@ -0,0 +1,115 @@
+/*******************************************************************************
+ * Copyright (c) 2025 SAP S.E. and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     SAP S.E. - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.ui.internal.texteditor.codemining;
+
+import static org.eclipse.ui.texteditor.AbstractTextEditor.PREFERENCE_SHOW_WHITESPACE_CHARACTERS;
+import static org.eclipse.ui.texteditor.AbstractTextEditor.PREFERENCE_SHOW_ZW_CHARACTERS;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+
+import org.eclipse.core.runtime.IProgressMonitor;
+
+import org.eclipse.jface.preference.IPreferenceStore;
+import org.eclipse.jface.util.IPropertyChangeListener;
+import org.eclipse.jface.util.PropertyChangeEvent;
+
+import org.eclipse.jface.text.ITextViewer;
+import org.eclipse.jface.text.codemining.AbstractCodeMiningProvider;
+import org.eclipse.jface.text.codemining.ICodeMining;
+import org.eclipse.jface.text.source.ISourceViewerExtension5;
+
+/**
+ * A code mining provider that draws zero-width characters (like zero-width
+ * spaces) as line content code minings.
+ * <p>
+ * The code mining is only shown if configured in the preferences.
+ * </p>
+ */
+public class ZeroWidthCharactersLineContentCodeMiningProvider extends AbstractCodeMiningProvider
+		implements IPropertyChangeListener {
+
+	private static final char ZW_SPACE = '\u200b';
+	private static final char ZW_NON_JOINER = '\u200c';
+	private static final char ZW_JOINER = '\u200d';
+	private static final char ZW_NO_BREAK_SPACE = '\ufeff';
+
+	private static final Set<Character> ZW_CHARACTERS = Set.of(ZW_SPACE, ZW_NON_JOINER, ZW_JOINER, ZW_NO_BREAK_SPACE);
+
+	private IPreferenceStore store;
+	private boolean showZwsp = false;
+
+	@Override
+	public CompletableFuture<List<? extends ICodeMining>> provideCodeMinings(ITextViewer viewer,
+			IProgressMonitor monitor) {
+		if (store == null) {
+			loadStoreAndReadProperty();
+		}
+
+		if (!showZwsp) {
+			return CompletableFuture.completedFuture(Collections.emptyList());
+		}
+
+		List<ICodeMining> list = new ArrayList<>();
+		String content = viewer.getDocument().get();
+		for (int i = 0; i < content.length(); i++) {
+			boolean isZwCharacter = ZW_CHARACTERS.contains(content.charAt(i));
+			if (isZwCharacter) {
+				list.add(createCodeMining(i));
+			}
+		}
+		return CompletableFuture.completedFuture(list);
+	}
+
+	@Override
+	public void propertyChange(PropertyChangeEvent event) {
+		if (PREFERENCE_SHOW_ZW_CHARACTERS.equals(event.getProperty())
+				|| PREFERENCE_SHOW_WHITESPACE_CHARACTERS.equals(event.getProperty())) {
+			readShowZwspFromStore();
+			updateCodeMinings();
+		}
+	}
+
+	private void updateCodeMinings() {
+		ITextViewer viewer = getAdapter(ITextViewer.class);
+		if (viewer instanceof ISourceViewerExtension5 codeMiningExtension) {
+			codeMiningExtension.updateCodeMinings();
+		}
+	}
+
+
+	@Override
+	public void dispose() {
+		store.removePropertyChangeListener(this);
+		super.dispose();
+	}
+
+	private void loadStoreAndReadProperty() {
+		store = getAdapter(IPreferenceStore.class);
+		readShowZwspFromStore();
+		store.addPropertyChangeListener(this);
+	}
+
+	private ICodeMining createCodeMining(int offset) {
+		return new ZeroWidthCharactersLineContentCodeMining(offset, this);
+	}
+
+	private void readShowZwspFromStore() {
+		showZwsp = store.getBoolean(PREFERENCE_SHOW_ZW_CHARACTERS)
+				&& store.getBoolean(PREFERENCE_SHOW_WHITESPACE_CHARACTERS);
+	}
+}

bundles/org.eclipse.ui.workbench.texteditor/src/org/eclipse/ui/texteditor/AbstractTextEditor.java

@@ -2334,10 +2334,21 @@ private int computeOffsetAtLocation(ITextViewer textViewer, int x, int y) {
 	public static final String PREFERENCE_SHOW_LINE_FEED = "showLineFeed"; //$NON-NLS-1$
 
 	/**
-	 * A named preference that controls the alpha value of whitespace characters.
-	 * The value is used only if the value of
+	 * A named preference that controls the display of zero-width characters like
+	 * zero-width space. The value is used only if the value of
 	 * {@link #PREFERENCE_SHOW_WHITESPACE_CHARACTERS} is <code>true</code>.
 	 * <p>
+	 * Value is of type <code>Boolean</code>.
+	 * </p>
+	 *
+	 * @since 3.?
+	 */
+	public static final String PREFERENCE_SHOW_ZW_CHARACTERS = "showZwsp"; //$NON-NLS-1$
+
+	/**
+	 * A named preference that controls the alpha value of whitespace characters. The value is used
+	 * only if the value of {@link #PREFERENCE_SHOW_WHITESPACE_CHARACTERS} is <code>true</code>.
+	 * <p>
 	 * Value is of type <code>Integer</code>.
 	 * </p>
 	 *