[enh] Migrate label services to new services organization

CHANGELOG.adoc

@@ -15,7 +15,30 @@
 - https://github.com/eclipse-syson/syson/issues/1628[#1628] [services] Introduce new services organization.
 https://doc.mbse-syson.org/syson/main/developer-guide/index.html#services_organization[See the developer guide in the documentation for more details].
 Also introduces new `ServiceMethod` helper class to build AQL service call expressions from type-safe Java method references instead of hardcoded strings.
-- [services] _isActor(Element)_ has been moved from `ViewNodeService` to `ElementQueryService`.
+- [services] _isActor(Element)_ has been moved from `ViewNodeService` to `MetamodelElementQueryService`.
+- [services] The following services have been moved from `LabelService` and `ViewLabelService` to `DiagramQueryLabelService`:
+* String getBorderNodeUsageLabel(Usage usage)
+* String getCompartmentItemLabel(Documentation documentation)
+* String getCompartmentItemLabel(Usage usage)
+* String getContainerLabel(Element element)
+* String getDefaultInitialDirectEditLabel(Comment comment)
+* String getDefaultInitialDirectEditLabel(Element element)
+* String getDefaultInitialDirectEditLabel(TextualRepresentation textualRepresentation)
+* String getDependencyLabel(Dependency dependency)
+* String getEdgeLabel(Element element)
+* String getInitialDirectEditListItemLabel(Documentation documentation)
+* String getInitialDirectEditListItemLabel(Comment comment)
+* String getInitialDirectEditListItemLabel(Usage usage)
+* String getMultiplicityLabel(Element element)
+* String getTransitionLabel(TransitionUsage transition)
+- [services] The following services have been moved from `LabelService` and `ViewLabelService` to `DiagramMutationLabelService`:
+* Element directEdit(Element element, String newLabel)
+* Element directEdit(Element element, String newLabel, String... options)
+* Element directEdit(Element element, String newLabel, boolean isCompartmentItem, String... options)
+* Element directEditNode(Element element, String newLabel)
+* Element directEditListItem(Element element, String newLabel)
+* Element editMultiplicityRangeCenterLabel(Element element, String newLabel)
+* Element editEdgeCenterLabel(Element element, String newLabel)
 
 === Dependency update
 

backend/services/syson-diagram-services/pom.xml

@@ -62,6 +62,11 @@
 			<artifactId>syson-sysml-metamodel</artifactId>
 			<version>2025.10.1</version>
 		</dependency>
+		<dependency>
+			<groupId>org.eclipse.syson</groupId>
+			<artifactId>syson-services</artifactId>
+			<version>2025.10.1</version>
+		</dependency>
 		<!-- Tests -->
 		<dependency>
 			<groupId>org.testcontainers</groupId>

backend/services/syson-diagram-services/src/main/java/org/eclipse/syson/diagram/services/DiagramMutationLabelService.java

@@ -0,0 +1,146 @@
+/*******************************************************************************
+ * Copyright (c) 2025 Obeo.
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Obeo - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.syson.diagram.services;
+
+import java.text.MessageFormat;
+import java.util.Objects;
+
+import org.antlr.v4.runtime.CharStreams;
+import org.antlr.v4.runtime.CommonTokenStream;
+import org.antlr.v4.runtime.tree.ParseTree;
+import org.antlr.v4.runtime.tree.ParseTreeWalker;
+import org.eclipse.sirius.components.core.api.IFeedbackMessageService;
+import org.eclipse.sirius.components.representations.Message;
+import org.eclipse.sirius.components.representations.MessageLevel;
+import org.eclipse.syson.direct.edit.grammars.DirectEditLexer;
+import org.eclipse.syson.direct.edit.grammars.DirectEditParser;
+import org.eclipse.syson.services.DiagramDirectEditListener;
+import org.eclipse.syson.services.LabelService;
+import org.eclipse.syson.sysml.ConstraintUsage;
+import org.eclipse.syson.sysml.Element;
+import org.eclipse.syson.sysml.RequirementConstraintMembership;
+import org.springframework.stereotype.Service;
+
+/**
+ * Label-related services doing mutations in diagrams.
+ *
+ * @author arichard
+ */
+@Service
+public class DiagramMutationLabelService {
+
+    private final IFeedbackMessageService feedbackMessageService;
+
+    public DiagramMutationLabelService(IFeedbackMessageService feedbackMessageService) {
+        this.feedbackMessageService = Objects.requireNonNull(feedbackMessageService);
+    }
+
+    /**
+     * Apply the direct edit result (i.e. the newLabel) to the given {@link Element}.
+     *
+     * @param element
+     *            the given {@link Element}.
+     * @param newLabel
+     *            the new value to apply.
+     * @return the given {@link Element}.
+     */
+    public Element directEdit(Element element, String newLabel) {
+        return this.directEdit(element, newLabel, (String[]) null);
+    }
+
+    /**
+     * Apply the direct edit result (i.e. the newLabel) to the given {@link Element}, with the provided {@code options}.
+     * <p>
+     * This method is typically used to enable direct edit with some restrictions (e.g. de-activate the ability to edit
+     * the name of an element via direct edit). See {@link #directEdit(Element, String)} to perform a direct edit with
+     * default options.
+     * </p>
+     *
+     * @param element
+     *            the given {@link Element}
+     * @param newLabel
+     *            the new value to apply
+     * @param options
+     *            the options of the direct edit
+     * @return the given {@link Element}
+     */
+    public Element directEdit(Element element, String newLabel, String... options) {
+        return this.directEdit(element, newLabel, false, options);
+    }
+
+    /**
+     * Apply the direct edit result (i.e. the newLabel) to the given {@link Element}.
+     *
+     * @param element
+     *            the given {@link Element}.
+     * @param newLabel
+     *            the new value to apply.
+     * @return the given {@link Element}.
+     */
+    public Element directEdit(Element element, String newLabel, boolean isCompartmentItem, String... options) {
+        DirectEditLexer lexer = new DirectEditLexer(CharStreams.fromString(newLabel));
+        CommonTokenStream tokens = new CommonTokenStream(lexer);
+        DirectEditParser parser = new DirectEditParser(tokens);
+        ParseTree tree;
+        if (element instanceof ConstraintUsage && element.getOwningMembership() instanceof RequirementConstraintMembership && isCompartmentItem) {
+            // Use the constraint expression parser only if the element is a constraint owned by a requirement, other
+            // constraints (including requirements) are parsed as regular elements.
+            tree = parser.constraintExpression();
+        } else if (isCompartmentItem) {
+            tree = parser.listItemExpression();
+        } else {
+            tree = parser.nodeExpression();
+        }
+        ParseTreeWalker walker = new ParseTreeWalker();
+        DiagramDirectEditListener listener = new DiagramDirectEditListener(element, this.feedbackMessageService, options);
+        walker.walk(listener, tree);
+        listener.resolveProxies().forEach(proxy -> {
+            this.feedbackMessageService.addFeedbackMessage(new Message(MessageFormat.format("Unable to resolve \u2035{0}\u2035", proxy.nameToResolve()), MessageLevel.WARNING));
+        });
+        return element;
+    }
+
+    /**
+     * Apply the direct edit result (i.e. the newLabel) to the given graphical node {@link Element}.
+     *
+     * @param element
+     *            the given {@link Element}.
+     * @param newLabel
+     *            the new value to apply.
+     * @return the given {@link Element}.
+     */
+    public Element directEditNode(Element element, String newLabel) {
+        return this.directEdit(element, newLabel, false, (String[]) null);
+    }
+
+    /**
+     * Apply the direct edit result (i.e. the newLabel) to the given graphical list item {@link Element}.
+     *
+     * @param element
+     *            the given {@link Element}.
+     * @param newLabel
+     *            the new value to apply.
+     * @return the given {@link Element}.
+     */
+    public Element directEditListItem(Element element, String newLabel) {
+        return this.directEdit(element, newLabel, true, (String[]) null);
+    }
+
+    public Element editMultiplicityRangeCenterLabel(Element element, String newLabel) {
+        return this.directEdit(element, newLabel, LabelService.NAME_OFF, LabelService.REDEFINITION_OFF, LabelService.SUBSETTING_OFF, LabelService.TYPING_OFF, LabelService.VALUE_OFF);
+    }
+
+    public Element editEdgeCenterLabel(Element element, String newLabel) {
+        return this.directEdit(element, newLabel, LabelService.REDEFINITION_OFF, LabelService.SUBSETTING_OFF, LabelService.VALUE_OFF);
+    }
+}