From 607dbefc84944a02ea00c337d36bc45576a0ef6f Mon Sep 17 00:00:00 2001
From: Mayorov Alexander <mayorov.shurik@mail.ru>
Date: Wed, 4 Jun 2025 02:32:26 +0300
Subject: [PATCH] fix: prevent duplicate descriptor handling

---
 .../main/kotlin/org/ucfs/descriptors/DescriptorsStorage.kt    | 4 ++--
 solver/src/main/kotlin/org/ucfs/parser/Gll.kt                 | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/solver/src/main/kotlin/org/ucfs/descriptors/DescriptorsStorage.kt b/solver/src/main/kotlin/org/ucfs/descriptors/DescriptorsStorage.kt
index 4e79bb00c..f540d8df7 100644
--- a/solver/src/main/kotlin/org/ucfs/descriptors/DescriptorsStorage.kt
+++ b/solver/src/main/kotlin/org/ucfs/descriptors/DescriptorsStorage.kt
@@ -26,8 +26,8 @@ open class DescriptorsStorage<VertexType> {
         return descriptorsToHandle.removeLast()
     }
 
-    fun addToHandled(descriptor: Descriptor<VertexType>) {
-        handledDescriptors.add(descriptor)
+    fun addToHandled(descriptor: Descriptor<VertexType>): Boolean {
+        return handledDescriptors.add(descriptor)
     }
 
     fun add(descriptor: Descriptor<VertexType>) {
diff --git a/solver/src/main/kotlin/org/ucfs/parser/Gll.kt b/solver/src/main/kotlin/org/ucfs/parser/Gll.kt
index 022935439..5d163a175 100644
--- a/solver/src/main/kotlin/org/ucfs/parser/Gll.kt
+++ b/solver/src/main/kotlin/org/ucfs/parser/Gll.kt
@@ -77,7 +77,7 @@ class Gll<VertexType, LabelType : ILabel> private constructor(
      * @param descriptor - descriptor to process
      */
     override fun handleDescriptor(descriptor: Descriptor<VertexType>) {
-        ctx.descriptors.addToHandled(descriptor)
+        if (!ctx.descriptors.addToHandled(descriptor)) return
         if (descriptor.rsmState.isFinal) {
             val matchedRange = if (descriptor.sppfNode.type is EmptyType) {
                 val node = getEpsilonRange(descriptor)