feat: temporary grammar

InkBlot/ParseHierarchy/MultiDivert.cs

@@ -1,3 +1,27 @@
-namespace InkBlot.ParseHierarchy;
+using OneOf;
 
-public record MultiDivert : StoryNode;
+namespace InkBlot.ParseHierarchy;
+
+[GenerateOneOf]
+public partial class
+    MultiDivert : OneOfBase<ThreadDivert, DivertsListWithReturnFromTunnel, DivertsListWithoutReturnFromTunnel>,
+    IStoryNode
+{
+}
+
+public record Identifier(string[] Elements /* TODO: expressions */);
+
+// <- thread_name
+public record ThreadDivert(Identifier Identifier) : IStoryNode;
+
+// -> ... ->->                      // return from tunnel
+// or
+// -> ... ->-> tunnelReplacement    // return from tunnel, but replace destination
+public record DivertsListWithReturnFromTunnel(Identifier[] Identifiers, Identifier? TunnelReplacement)
+    : IStoryNode;
+
+// -> ... -> div             // not a tunnel
+// or
+// -> ... -> div ->          // is tunnel
+public record DivertsListWithoutReturnFromTunnel(Identifier[] Identifiers, bool IsTunnel)
+    : IStoryNode;