From c350c24f6247f8c6f1e5c51de3745232dc7350f0 Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Fri, 28 Jul 2017 09:51:59 -0700
Subject: [PATCH] Add link nodes to collections and check for their presence.
 This prevents infinite loops, as Link nodes do not follow regular addInto
 behavior.

---
 src/org/nwapw/abacus/lexing/pattern/LinkNode.java | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/org/nwapw/abacus/lexing/pattern/LinkNode.java b/src/org/nwapw/abacus/lexing/pattern/LinkNode.java
index 7c85c0f..63b5335 100644
--- a/src/org/nwapw/abacus/lexing/pattern/LinkNode.java
+++ b/src/org/nwapw/abacus/lexing/pattern/LinkNode.java
@@ -11,7 +11,10 @@ public class LinkNode<T> extends PatternNode<T> {
 
     @Override
     public void addInto(Collection<PatternNode<T>> into) {
-        addOutputsInto(into);
+        if(!into.contains(this)) {
+            into.add(this);
+            addOutputsInto(into);
+        }
     }
 
 }