feat: Use symbol tags in views to display visibility and other details

Affected views
- Outline view
- Call hierarchy view
- Type hierachy view (and quick type hierarchy dialog)

This change is an implementation of the proposal from
microsoft/language-server-protocol#2003
See also #977
and llvm/llvm-project#167536

Author: travkin79

org.eclipse.lsp4e.test/src/org/eclipse/lsp4e/test/symbols/SymbolsUtilTest.java

@@ -0,0 +1,88 @@
+/*******************************************************************************
+ * Copyright (c) 2024 Advantest 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:
+ *  Dietrich Travkin (Solunar GmbH) - initial implementation
+ *******************************************************************************/
+package org.eclipse.lsp4e.test.symbols;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.eclipse.lsp4e.operations.symbols.SymbolsUtil;
+import org.eclipse.lsp4j.DocumentSymbol;
+import org.eclipse.lsp4j.SymbolInformation;
+import org.eclipse.lsp4j.SymbolTag;
+import org.eclipse.lsp4j.WorkspaceSymbol;
+import org.junit.jupiter.api.Test;
+
+public class SymbolsUtilTest {
+	
+	private static final List<SymbolTag> symbolTagsWithDeprecated = Arrays.asList(
+			SymbolTag.Package, SymbolTag.Deprecated, SymbolTag.ReadOnly);
+	private static final List<SymbolTag> symbolTagsWithoutDeprecated = Arrays.asList(
+			SymbolTag.Public, SymbolTag.Declaration, SymbolTag.Static);
+	
+	@Test
+	public void testDeprecatedCheckForSymbolInformation() {
+		var symbolInformation = new SymbolInformation();
+		
+		assertFalse(SymbolsUtil.isDeprecated(symbolInformation));
+		
+		symbolInformation.setDeprecated(true);
+		
+		assertTrue(SymbolsUtil.isDeprecated(symbolInformation));
+		
+		symbolInformation = new SymbolInformation();
+		symbolInformation.setTags(symbolTagsWithDeprecated);
+		
+		assertTrue(SymbolsUtil.isDeprecated(symbolInformation));
+		
+		symbolInformation.setTags(symbolTagsWithoutDeprecated);
+		
+		assertFalse(SymbolsUtil.isDeprecated(symbolInformation));
+	}
+	
+	@Test
+	public void testDeprecatedCheckForWorkspaceSymbol() {
+		var workspaceSymbol = new WorkspaceSymbol();
+		
+		assertFalse(SymbolsUtil.isDeprecated(workspaceSymbol));
+		
+		workspaceSymbol.setTags(symbolTagsWithDeprecated);
+		
+		assertTrue(SymbolsUtil.isDeprecated(workspaceSymbol));
+		
+		workspaceSymbol.setTags(symbolTagsWithoutDeprecated);
+		
+		assertFalse(SymbolsUtil.isDeprecated(workspaceSymbol));
+	}
+	
+	@Test
+	public void testDeprecatedCheckForDocumentSymbol() {
+		var documentSymbol = new DocumentSymbol();
+		
+		assertFalse(SymbolsUtil.isDeprecated(documentSymbol));
+		
+		documentSymbol.setDeprecated(true);
+		
+		assertTrue(SymbolsUtil.isDeprecated(documentSymbol));
+		
+		documentSymbol = new DocumentSymbol();
+		documentSymbol.setTags(symbolTagsWithDeprecated);
+		
+		assertTrue(SymbolsUtil.isDeprecated(documentSymbol));
+		
+		documentSymbol.setTags(symbolTagsWithoutDeprecated);
+		
+		assertFalse(SymbolsUtil.isDeprecated(documentSymbol));
+	}
+
+}

org.eclipse.lsp4e.test/src/org/eclipse/lsp4e/test/utils/LSPImagesTest.java

@@ -0,0 +1,58 @@
+/*******************************************************************************
+ * Copyright (c) 2024 Advantest 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:
+ *  Dietrich Travkin (Solunar GmbH) - initial implementation
+ *******************************************************************************/
+package org.eclipse.lsp4e.test.utils;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.eclipse.jface.resource.ImageDescriptor;
+import org.eclipse.lsp4e.ui.LSPImages;
+import org.eclipse.lsp4j.CompletionItem;
+import org.eclipse.lsp4j.CompletionItemKind;
+import org.eclipse.lsp4j.SymbolKind;
+import org.eclipse.lsp4j.SymbolTag;
+import org.eclipse.swt.graphics.Image;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EnumSource;
+import org.junit.jupiter.params.provider.EnumSource.Mode;
+
+public class LSPImagesTest {
+	
+	@ParameterizedTest
+	@EnumSource(SymbolKind.class)
+	public void testAllImagesForSymbolKindAvailable(SymbolKind kind) {
+		Image img = LSPImages.imageFromSymbolKind(kind);
+		
+		assertNotNull(img);
+	}
+	
+	@ParameterizedTest
+	@EnumSource(SymbolTag.class)
+	public void testAllOverlayImagesForSymbolTagAvailable(SymbolTag tag) {
+		ImageDescriptor descriptor = LSPImages.imageDescriptorOverlayFromSymbolTag(tag);
+		Image img = LSPImages.imageOverlayFromSymbolTag(tag);
+		
+		assertNotNull(descriptor);
+		assertNotNull(img);
+	}
+	
+	@ParameterizedTest
+	@EnumSource(value=CompletionItemKind.class, mode=Mode.EXCLUDE, names= { "Color", "Event", "Operator" })
+	public void testAllImagesForCompletionItemKindAvailable(CompletionItemKind kind) {
+		CompletionItem item = new CompletionItem();
+		item.setKind(kind);
+		
+		Image img = LSPImages.imageFromCompletionItem(item);
+		
+		assertNotNull(img);
+	}
+
+}