[599] Handle ref keyword in direct edit

Bug: eclipse-syson#599
Signed-off-by: Gwendal Daniel <gwendal.daniel@obeosoft.com>

CHANGELOG.adoc

@@ -53,6 +53,7 @@ The changes are:
 - https://github.com/eclipse-syson/syson/issues/571[#571] [interconnection-view] Add ActionUsage node in Interconnection View
 - https://github.com/eclipse-syson/syson/issues/581[#581] [interconnection-view] Add documentation and action flow compartment in ActionUsage
 - https://github.com/eclipse-syson/syson/issues/590[#590] [diagrams] Add label support for referential Usages
+- https://github.com/eclipse-syson/syson/issues/599[#599] [diagrams] Add support for ref keyword in direct edit
 
 === New features
 

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

@@ -41,6 +41,8 @@ public class LabelConstants {
 
     public static final String REDEFINITION = ":>>";
 
+    public static final String REF = "ref";
+
     public static final String SPACE = " ";
 
     public static final String SUBCLASSIFICATION = ":>";

backend/services/syson-services/src/main/generated/org/eclipse/syson/services/grammars/DirectEdit.interp

@@ -1,5 +1,6 @@
 token literal names:
 null
+'ref '
 '['
 '..'
 ']'
@@ -131,6 +132,7 @@ null
 null
 null
 null
+null
 WS
 Boolean
 Integer
@@ -236,6 +238,7 @@ ANY
 
 rule names:
 expression
+referenceExpression
 multiplicityExpression
 multiplicityExpressionMember
 featureExpressions
@@ -253,4 +256,4 @@ name
 
 
 atn:
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