From 715019d833339394486b1a374a608ca94a2ef2bb Mon Sep 17 00:00:00 2001
From: Jesper Friis <jesper.friis@sintef.no>
Date: Tue, 16 Jan 2024 21:59:15 +0100
Subject: [PATCH] Avoid infinite recursion in set_common_prefix()

---
 ontopy/ontology.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/ontopy/ontology.py b/ontopy/ontology.py
index b4b416d5a..59076ad4f 100644
--- a/ontopy/ontology.py
+++ b/ontopy/ontology.py
@@ -551,6 +551,7 @@ def set_common_prefix(
         self,
         iri_base: str = "http://emmo.info/emmo",
         prefix: str = "emmo",
+        visited: "Optional[Set]" = None,
     ) -> None:
         """Set a common prefix for all imported ontologies
         with the same first part of the base_iri.
@@ -559,11 +560,18 @@ def set_common_prefix(
             iri_base: The start of the base_iri to look for. Defaults to
                 the emmo base_iri http://emmo.info/emmo
             prefix: the desired prefix. Defaults to emmo.
+            visited: Ontologies to skip. Only intended for internal use.
         """
+        if visited is None:
+            visited = set()
         if self.base_iri.startswith(iri_base):
             self.prefix = prefix
         for onto in self.imported_ontologies:
-            onto.set_common_prefix(iri_base=iri_base, prefix=prefix)
+            if not onto in visited:
+                visited.add(onto)
+                onto.set_common_prefix(
+                    iri_base=iri_base, prefix=prefix, visited=visited
+                )
 
     def load(  # pylint: disable=too-many-arguments,arguments-renamed
         self,