[2105] Display textual representation of expressions in the Explorer

CHANGELOG.adoc

@@ -46,6 +46,7 @@ Stakeholders are by default represented with a dedicated graphical node connecte
 - https://github.com/eclipse-syson/syson/issues/2111[#2111] [diagrams] Leverage the latest change of the selection dialog to allow creating a `Stakeholder` graphical node without specialization.
 - https://github.com/eclipse-syson/syson/issues/2122[#2122] [diagrams] Leverage the latest change of the selection dialog to allow creating a `Subject` graphical node without specialization.
 - https://github.com/eclipse-syson/syson/issues/2129[#2129] [diagrams] Leverage the latest change of the selection dialog to allow creating a `FlowUsage` from a `ConnectionUsage` without selection a `PayloadFeature`
+- https://github.com/eclipse-syson/syson/issues/2105[#2105] [explorer] In the _Explorer_ view, `Expression` elements now display their full textual representation.
 
 === New features
 

backend/application/syson-application/src/test/java/org/eclipse/syson/application/data/ActionTransitionUsagesProjectData.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2025 Obeo.
+ * Copyright (c) 2025, 2026 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
@@ -42,6 +42,8 @@ public static final class GraphicalIds {
      */
     public static final class SemanticIds {
 
+        public static final String DOCUMENT_ID = "26a78eef-bfa1-4de0-9d0a-c1f86a1b97d5";
+
         public static final String PACKAGE_1_ID = "2264f62c-b223-4b9b-ae41-96dc2ba0070e";
 
         public static final String A0_ID = "82a2fa10-e736-4c3e-b27a-e94f76d7456d";

backend/metamodel/syson-sysml-metamodel/src/main/java/org/eclipse/syson/sysml/helper/EMFUtils.java

@@ -282,7 +282,6 @@ public static <T extends EObject> List<T> getAncestors(Class<T> type, EObject ob
      */
     public static <T extends EObject> Optional<T> getFirstAncestor(Class<T> type, EObject object, Predicate<EObject> ancestorPredicate) {
         var current = object;
-        List<T> results = new ArrayList<>();
         while (current != null) {
             if (type.isInstance(current) && (ancestorPredicate == null || ancestorPredicate.test(current))) {
                 return Optional.of((T) current);

backend/services/syson-sysml-metamodel-services/src/main/java/org/eclipse/syson/sysml/metamodel/services/MetamodelQueryElementService.java

@@ -28,6 +28,7 @@
 import org.eclipse.syson.sysml.ReferenceUsage;
 import org.eclipse.syson.sysml.StakeholderMembership;
 import org.eclipse.syson.sysml.SubjectMembership;
+import org.eclipse.syson.sysml.Usage;
 
 /**
  * Element-related services doing queries. This class should not depend on sirius-web services or other spring services.
@@ -78,6 +79,19 @@ public boolean isStakeholder(Element element) {
         return element instanceof PartUsage && element.getOwningMembership() instanceof StakeholderMembership;
     }
 
+    /**
+     * Check if a given {@code element} is an {@link Expression} definition. We can not simply rely on whether the
+     * element is an instance of {@link Expression} as many types in SysMLv2 inherit from this type without being
+     * themselves an actual expressions.
+     *
+     * @param element
+     *            the element to test.
+     * @return true if the element is an actual expression definition.
+     */
+    public boolean isExpressionDefinition(Element element) {
+        return element instanceof Expression && !(element instanceof Usage);
+    }
+
     /**
      * Get the source of a {@link Connector}.
      *
@@ -144,7 +158,7 @@ public <T extends Element> Optional<T> getCommonOwnerAncestor(Element e1, Elemen
      * Gets the value expression of a feature (Value of the FeatureValue owned by this feature).
      *
      * @param feature
-     *         a non null feature
+     *            a non null feature
      * @return an optional expression
      */
     public Optional<Expression> getValueExpression(Feature feature) {

backend/services/syson-tree-services/src/main/java/org/eclipse/syson/tree/explorer/services/SysONDefaultExplorerServices.java

@@ -38,8 +38,13 @@
 import org.eclipse.sirius.web.domain.boundedcontexts.representationdata.RepresentationMetadata;
 import org.eclipse.sirius.web.domain.boundedcontexts.representationdata.services.api.IRepresentationMetadataSearchService;
 import org.eclipse.syson.sysml.Element;
+import org.eclipse.syson.sysml.Expression;
 import org.eclipse.syson.sysml.Type;
 import org.eclipse.syson.sysml.ViewUsage;
+import org.eclipse.syson.sysml.metamodel.services.MetamodelQueryElementService;
+import org.eclipse.syson.sysml.textual.SysMLElementSerializer;
+import org.eclipse.syson.sysml.textual.SysMLSerializingOptions;
+import org.eclipse.syson.sysml.textual.utils.FileNameDeresolver;
 import org.eclipse.syson.sysml.util.ElementUtil;
 import org.eclipse.syson.tree.explorer.fragments.KerMLStandardLibraryDirectory;
 import org.eclipse.syson.tree.explorer.fragments.LibrariesDirectory;
@@ -74,6 +79,8 @@ public class SysONDefaultExplorerServices implements ISysONDefaultExplorerServic
 
     private final IReadOnlyObjectPredicate readOnlyObjectPredicate;
 
+    private final MetamodelQueryElementService metamodelQueryElementService;
+
     public SysONDefaultExplorerServices(IIdentityService identityService, IContentService contentService, IRepresentationMetadataSearchService representationMetadataSearchService,
             IExplorerServices explorerServices, ILabelService labelService, ISysONExplorerFilterService filterService, final IReadOnlyObjectPredicate readOnlyObjectPredicate) {
         this.identityService = Objects.requireNonNull(identityService);
@@ -83,6 +90,7 @@ public SysONDefaultExplorerServices(IIdentityService identityService, IContentSe
         this.labelService = Objects.requireNonNull(labelService);
         this.filterService = Objects.requireNonNull(filterService);
         this.readOnlyObjectPredicate = Objects.requireNonNull(readOnlyObjectPredicate);
+        this.metamodelQueryElementService = new MetamodelQueryElementService();
     }
 
     @Override
@@ -148,6 +156,8 @@ public String getLabel(Object self) {
         String label = "";
         if (self instanceof ISysONExplorerFragment fragment) {
             label = fragment.getLabel();
+        } else if (self instanceof Expression expression && this.metamodelQueryElementService.isExpressionDefinition(expression)) {
+            label = this.getValueExpressionTextualRepresentation(expression);
         } else if (self instanceof Type type) {
             String name = type.getName();
             if (name != null) {
@@ -159,6 +169,25 @@ public String getLabel(Object self) {
         return label;
     }
 
+    private String getValueExpressionTextualRepresentation(Expression value) {
+        String result = "";
+        if (value != null) {
+            SysMLSerializingOptions options = new SysMLSerializingOptions.Builder()
+                    .lineSeparator("\n")
+                    .nameDeresolver(new FileNameDeresolver())
+                    .indentation("\t")
+                    .needEscapeCharacter(false)
+                    .build();
+            String textualFormat = new SysMLElementSerializer(options, s -> {
+                // Do nothing for now
+            }).doSwitch(value);
+            if (textualFormat != null) {
+                result = textualFormat;
+            }
+        }
+        return result;
+    }
+
     private String getFallbackLabel(Object self) {
         StyledString styledLabel = this.labelService.getStyledLabel(self);
         if (styledLabel != null) {

doc/content/modules/user-manual/pages/release-notes/2026.5.0.adoc

@@ -37,6 +37,12 @@ image::release-notes-stakeholder-node.png[Default representation of Stakeholder
 ** Improve the tool to create a `Subject` graphical node by making specialization selection optional.
 ** Improve the tool to create a `FlowUsage` from a `ConnectionUsage` by making the payload selection optional.
 
+* In the _Explorer_ view:
+
+** `Expression` elements now display their full textual representation:
++
+image::explorer-expression-text.png[Expression textual representation]
+
 == Technical details
 
 * For technical details on this {product} release (including breaking changes), please refer to https://github.com/eclipse-syson/syson/blob/main/CHANGELOG.adoc[changelog].

frontend/syson-components/src/extensions/InsertTextualSysMLv2Modal.tsx

@@ -22,7 +22,6 @@ import { Theme } from '@mui/material/styles';
 import TextField from '@mui/material/TextField';
 import { useEffect, useState } from 'react';
 import { makeStyles } from 'tss-react/mui';
-
 import { InsertTextualSysMLv2ModalProps, InsertTextualSysMLv2ModalState } from './InsertTextualSysMLv2Modal.types';
 import { NewObjectAsTextReport } from './NewObjectAsTextDocumentReport';
 import { useInsertTextualSysMLv2 } from './useInsertTextualSysMLv2';
@@ -106,7 +105,7 @@ export const InsertTextualSysMLv2Modal = ({ editingContextId, item, onClose }: I
             onClick={(event) => onInsertTextualSysMLv2(event)}
             startIcon={
               state.insertInProgress ? (
-                <CircularProgress size="20px" data-testid="arrange-all-circular-loading" />
+                <CircularProgress size="20px" data-testid="create-objects-circular-loading" />
               ) : (
                 <PublishIcon />
               )

frontend/syson-components/src/extensions/useInsertTextualSysMLv2.ts

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2025 Obeo.
+ * Copyright (c) 2025, 2026 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
@@ -19,7 +19,7 @@ import {
   GQLInsertTextualSysMLv2MutationData,
   GQLInsertTextualSysMLv2Payload,
   UseInsertTextualSysMLv2Value,
-} from './useInsertTextualSysML.v2types';
+} from './useInsertTextualSysMLv2.types';
 
 const insertTextualSysMLv2Mutation = gql`
   mutation insertTextualSysMLv2($input: InsertTextualSysMLv2Input!) {

frontend/syson-components/src/extensions/useInsertTextualSysML.v2types.ts → frontend/syson-components/src/extensions/useInsertTextualSysMLv2.types.ts

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2024, 2025 Obeo.
+ * Copyright (c) 2024, 2026 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

scripts/check-coverage.jsh

@@ -40,18 +40,18 @@ var moduleCoverageData = List.of(
   new ModuleCoverage("syson-form-services", 100.0),
   new ModuleCoverage("syson-model-services", 94.0),
   new ModuleCoverage("syson-representation-services", 100.0),
-  new ModuleCoverage("syson-services", 64.0),
+  new ModuleCoverage("syson-services", 65.0),
   new ModuleCoverage("syson-siriusweb-customnodes-metamodel", 41.0),
   new ModuleCoverage("syson-siriusweb-customnodes-metamodel-edit", 0.0),
   new ModuleCoverage("syson-standard-diagrams-view", 97.0),
   new ModuleCoverage("syson-sysml-export", 71.0),
   new ModuleCoverage("syson-sysml-import", 85.0),
-  new ModuleCoverage("syson-sysml-metamodel", 76.0),
+  new ModuleCoverage("syson-sysml-metamodel", 77.0),
   new ModuleCoverage("syson-sysml-metamodel-edit", 17.0),
   new ModuleCoverage("syson-sysml-metamodel-services", 92.0),
   new ModuleCoverage("syson-sysml-rest-api-services", 93.0),
   new ModuleCoverage("syson-sysml-validation", 97.0),
-  new ModuleCoverage("syson-table-requirements-view", 72.0),
+  new ModuleCoverage("syson-table-requirements-view", 73.0),
   new ModuleCoverage("syson-table-services", 100.0),
   new ModuleCoverage("syson-tree-explorer-view", 88.0),
   new ModuleCoverage("syson-tree-services", 80.0)