feat: add support inserting surrounding pairs for text selections

org.eclipse.tm4e.languageconfiguration.tests/src/main/java/org/eclipse/tm4e/languageconfiguration/tests/TestSurroundingPairs.java

@@ -0,0 +1,60 @@
+/**
+ * Copyright (c) 2024 Vegard IT GmbH and others.
+ *
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ * - Sebastian Thomschke (Vegard IT) - initial implementation
+ */
+package org.eclipse.tm4e.languageconfiguration.tests;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.ByteArrayInputStream;
+
+import org.eclipse.core.resources.IFile;
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.ResourcesPlugin;
+import org.eclipse.swt.custom.StyledText;
+import org.eclipse.swt.widgets.Control;
+import org.eclipse.tm4e.ui.internal.utils.UI;
+import org.eclipse.ui.ide.IDE;
+import org.eclipse.ui.texteditor.ITextEditor;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
+
+public class TestSurroundingPairs {
+
+	@AfterEach
+	public void tearDown() throws Exception {
+		UI.getActivePage().closeAllEditors(false);
+		for (final IProject p : ResourcesPlugin.getWorkspace().getRoot().getProjects()) {
+			p.delete(true, null);
+		}
+	}
+
+	@Test
+	public void testSurroundingPairs() throws Exception {
+		final IProject p = ResourcesPlugin.getWorkspace().getRoot().getProject(getClass().getName() + System.currentTimeMillis());
+		p.create(null);
+		p.open(null);
+		final IFile file = p.getFile("test.lc-test");
+		file.create(new ByteArrayInputStream(new byte[0]), true, null);
+		final ITextEditor editor = (ITextEditor) IDE.openEditor(UI.getActivePage(), file);
+		final StyledText text = (StyledText) editor.getAdapter(Control.class);
+
+		text.setText("the mountain is high");
+		text.setSelection(4, 12);
+		assertEquals(12, text.getCaretOffset());
+		assertEquals("mountain", text.getSelectionText());
+		text.insert("(");
+		assertEquals("the (mountain) is high", text.getText());
+		assertEquals("mountain", text.getSelectionText());
+		assertEquals(13, text.getCaretOffset());
+
+	}
+}

org.eclipse.tm4e.languageconfiguration/src/main/java/org/eclipse/tm4e/languageconfiguration/internal/LanguageConfigurationAutoEditStrategy.java

@@ -14,6 +14,7 @@
 import static org.eclipse.tm4e.languageconfiguration.internal.utils.TextUtils.*;
 
 import java.util.Arrays;
+import java.util.List;
 
 import org.eclipse.core.runtime.content.IContentType;
 import org.eclipse.jdt.annotation.Nullable;
@@ -22,9 +23,9 @@
 import org.eclipse.jface.text.DocumentCommand;
 import org.eclipse.jface.text.IAutoEditStrategy;
 import org.eclipse.jface.text.IDocument;
-import org.eclipse.jface.text.ITextViewer;
 import org.eclipse.tm4e.core.model.TMToken;
 import org.eclipse.tm4e.languageconfiguration.LanguageConfigurationPlugin;
+import org.eclipse.tm4e.languageconfiguration.internal.model.AutoClosingPair;
 import org.eclipse.tm4e.languageconfiguration.internal.model.AutoClosingPairConditional;
 import org.eclipse.tm4e.languageconfiguration.internal.model.CursorConfiguration;
 import org.eclipse.tm4e.languageconfiguration.internal.registry.LanguageConfigurationRegistryManager;
@@ -44,12 +45,11 @@ public class LanguageConfigurationAutoEditStrategy implements IAutoEditStrategy
 
 	private IContentType[] contentTypes = EMPTY_CONTENT_TYPES;
 	private @Nullable IDocument document;
-	private @Nullable ITextViewer viewer;
 
 	/**
 	 * @see <a href=
 	 *      "https://github.com/microsoft/vscode/blob/ba2cf46e20df3edf77bdd905acde3e175d985f70/src/vs/editor/common/cursor/cursorTypeOperations.ts#L934">
-	 *      github.com/microsoft/vscode/src/vs/editor/common/cursor/cursorTypeOperations.ts</a>
+	 *      github.com/microsoft/vscode/src/vs/editor/common/cursor/cursorTypeOperations.ts#typeWithInterceptors</a>
 	 */
 	@Override
 	public void customizeDocumentCommand(@Nullable final IDocument doc, @Nullable final DocumentCommand command) {
@@ -62,22 +62,46 @@ public void customizeDocumentCommand(@Nullable final IDocument doc, @Nullable fi
 			this.document = doc;
 		}
 
-		if (contentTypes.length == 0)
+		if (contentTypes.length == 0 || command.getCommandCount() > 1)
 			return;
 
-		installViewer();
-
 		if (isEnter(doc, command)) {
-			// key enter pressed
+			// enter-key pressed
 			final var cursorCfg = TextEditorPrefs.getCursorConfiguration(UI.getActiveTextEditor());
 			onEnter(cursorCfg, doc, contentTypes, command);
 			return;
 		}
 
 		final var registry = LanguageConfigurationRegistryManager.getInstance();
 
-		// auto close pair
 		if (command.text.length() == 1) {
+			// auto surround pair
+			final var textSelection = UI.getActiveTextSelection();
+			if (textSelection != null && textSelection.getLength() > 0) {
+				for (final IContentType contentType : contentTypes) {
+					final List<AutoClosingPair> surroundingPairs = registry.getSurroundingPairs(contentType);
+					if (surroundingPairs.isEmpty())
+						continue;
+
+					for (final AutoClosingPair pair : surroundingPairs) {
+						if (command.text.equals(pair.open)) {
+							// surround selection with pairs
+							command.length = 0;
+							try {
+								command.addCommand(command.offset + textSelection.getLength(),
+										0, pair.close, null);
+								command.caretOffset = command.offset + textSelection.getLength() + pair.open.length();
+								command.shiftsCaret = false;
+							} catch (final BadLocationException ex) {
+								LanguageConfigurationPlugin.logError(ex);
+							}
+							return;
+						}
+					}
+				}
+			}
+
+			// auto close pair
 			for (final IContentType contentType : contentTypes) {
 				final var autoClosingPair = registry.getAutoClosingPair(doc.get(), command.offset, command.text, contentType);
 				if (autoClosingPair == null) {
@@ -274,10 +298,4 @@ private static void onEnter(final CursorConfiguration cursorCfg, final IDocument
 		// fail back to default for indentation
 		new DefaultIndentLineAutoEditStrategy().customizeDocumentCommand(doc, command);
 	}
-
-	private void installViewer() {
-		if (viewer == null) {
-			viewer = UI.getActiveTextViewer();
-		}
-	}
 }

org.eclipse.tm4e.ui/src/main/java/org/eclipse/tm4e/ui/internal/utils/UI.java

@@ -17,6 +17,7 @@
 import org.eclipse.jdt.annotation.Nullable;
 import org.eclipse.jface.dialogs.Dialog;
 import org.eclipse.jface.resource.JFaceResources;
+import org.eclipse.jface.text.ITextSelection;
 import org.eclipse.jface.text.ITextViewer;
 import org.eclipse.jface.viewers.StructuredSelection;
 import org.eclipse.jface.viewers.TableViewer;
@@ -77,6 +78,15 @@ public static ITextEditor getActiveTextEditor() {
 		return null;
 	}
 
+	public static @Nullable ITextSelection getActiveTextSelection() {
+		final var editor = getActiveTextEditor();
+		if (editor == null)
+			return null;
+		if (editor.getSelectionProvider().getSelection() instanceof final ITextSelection sel)
+			return sel;
+		return null;
+	}
+
 	@Nullable
 	public static ITextViewer getActiveTextViewer() {
 		final var editor = getActiveTextEditor();