Added structure-based editing stuf (not tested).

plugins/de.cau.cs.kieler.klighd.lsp/src/de/cau/cs/kieler/klighd/lsp/LSPUtil.xtend

@@ -18,6 +18,7 @@ package de.cau.cs.kieler.klighd.lsp
 
 import com.google.common.html.HtmlEscapers
 import de.cau.cs.kieler.klighd.ViewContext
+import de.cau.cs.kieler.klighd.kgraph.KEdge
 import de.cau.cs.kieler.klighd.kgraph.KNode
 
 /**
@@ -64,6 +65,26 @@ class LSPUtil {
         }
     }
 
+    /**
+     * Get a {@code KEdge} based by id.
+     * 
+     * @param diagramState The state of the diagram
+     * @param uri The uri of the model file
+     * @param edgeId The id of the edge element
+     * @return the {@code KEdge} of the edge described by {@code id}.
+     * Returns null if the {@code ViewContext} of the resource described by {@code uri} is null.
+     * Returns null if the element behind the id is no kEdge.
+     */
+    static def getKEdge(KGraphDiagramState diagramState, String uri, String nodeId) {
+        val kGraphElement = diagramState.getIdToKGraphMap(uri).get(nodeId)
+
+        if (kGraphElement instanceof KEdge) {
+            return kGraphElement as KEdge
+        } else {
+            return null
+        }
+    }
+
     /**
      * Escapes the given message to be safely displayable in a client context putting this message into an HTML page
      * to avoid possibilities of XSS attacks and a clearly readable message. Uses Google Guava's {@link HtmlEscapers}

plugins/de.cau.cs.kieler.klighd/src/de/cau/cs/kieler/klighd/structurebasedediting/InputType.java

@@ -0,0 +1,33 @@
+/*
+ * KIELER - Kiel Integrated Environment for Layout Eclipse RichClient
+ *
+ * http://rtsys.informatik.uni-kiel.de/kieler
+ * 
+ * Copyright 2024 by
+ * + Kiel University
+ *   + Department of Computer Science
+ *     + Real-Time and Embedded Systems Group
+ * 
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package de.cau.cs.kieler.klighd.structurebasedediting;
+
+/**
+ * Data class for structured editing input type.
+ */
+public class InputType {
+    String field;
+    String type;
+    String label;
+
+    public InputType(String field, String type, String label) {
+        this.field = field;
+        this.type = type;
+        this.label = label;
+    }
+
+}

plugins/de.cau.cs.kieler.klighd/src/de/cau/cs/kieler/klighd/structurebasedediting/StructureBasedEditingMessage.java

@@ -0,0 +1,35 @@
+/*
+ * KIELER - Kiel Integrated Environment for Layout Eclipse RichClient
+ *
+ * http://rtsys.informatik.uni-kiel.de/kieler
+ * 
+ * Copyright 2024 by
+ * + Kiel University
+ *   + Department of Computer Science
+ *     + Real-Time and Embedded Systems Group
+ * 
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package de.cau.cs.kieler.klighd.structurebasedediting;
+
+/**
+ * Data class for structure editing message to be send from client to server.
+ */
+public class StructureBasedEditingMessage {
+
+    String label;
+    String kind;
+    Boolean mergable;
+    InputType[] inputs;
+
+    public StructureBasedEditingMessage(String label, String kind, Boolean mergable, InputType[] inputs) {
+        this.label = label;
+        this.kind = kind;
+        this.mergable = mergable;
+        this.inputs = inputs;
+    }
+}

plugins/de.cau.cs.kieler.klighd/src/de/cau/cs/kieler/klighd/structurebasedediting/StructureBasedEditingOptions.java

@@ -0,0 +1,32 @@
+/*
+ * KIELER - Kiel Integrated Environment for Layout Eclipse RichClient
+ *
+ * http://rtsys.informatik.uni-kiel.de/kieler
+ * 
+ * Copyright 2024 by
+ * + Kiel University
+ *   + Department of Computer Science
+ *     + Real-Time and Embedded Systems Group
+ * 
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package de.cau.cs.kieler.klighd.structurebasedediting;
+
+import java.util.Map;
+
+import de.cau.cs.kieler.klighd.filtering.SemanticFilterTag;
+
+/**
+ * Property that holds the information about support structured editing messages and what elements support which message.
+ */
+public class StructureBasedEditingOptions {
+    Map<SemanticFilterTag, StructureBasedEditingMessage[]> options;
+
+    public StructureBasedEditingOptions(Map<SemanticFilterTag, StructureBasedEditingMessage[]> map) {
+        options = map;
+    }
+}

plugins/de.cau.cs.kieler.klighd/src/de/cau/cs/kieler/klighd/util/KlighdProperties.java

@@ -35,6 +35,7 @@
 import de.cau.cs.kieler.klighd.kgraph.KNode;
 import de.cau.cs.kieler.klighd.krendering.KText;
 import de.cau.cs.kieler.klighd.microlayout.Bounds;
+import de.cau.cs.kieler.klighd.structurebasedediting.StructureBasedEditingOptions;
 
 /**
  * A collection of KLighD-specific {@link IProperty IProperties}
@@ -381,6 +382,20 @@ public static boolean isSelectable(final EObject viewElement) {
     public static final IProperty<Boolean> IS_NODE_TITLE =
             new Property<Boolean>("klighd.isNodeTitle", false);
 
+    /**
+     * Property holding the structured editing options which are supported for a certain language.
+     * By default no support is given.
+     */
+    public static final IProperty<StructureBasedEditingOptions> STRUCTURED_EDITING =
+            new Property<StructureBasedEditingOptions>("klighd.StructuralEditingOptions", null);
+
+    /**
+     * Property determining if the contextmenu should be rendered on the client. Since the contextmenu is only suported
+     * for certain languages it makes sense to keep track only on the server to show it
+     */
+    public static final IProperty<Boolean> SHOW_STRUCTURED_EDITING_MENU = 
+            new Property<Boolean>("klighd.showContextmenu", true);
+
     /**
      * Property determining whether this node should be rendered as a proxy.
      */