From 2a8ebe23991d5337b09a17d0e197f32d32245e31 Mon Sep 17 00:00:00 2001
From: Ishigh1 <bonjour940@yahoo.fr>
Date: Wed, 3 Jun 2026 08:20:04 +0200
Subject: [PATCH] Core+RB: Make has_from_list, has_from_list_unique, has_group
 and has_group_unique return True if count <= 0 and list is empty (#6240)

---
 BaseClasses.py        |  8 ++++++++
 rule_builder/rules.py | 23 +++++++++++++++++------
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/BaseClasses.py b/BaseClasses.py
index 69b900212c..33e4fb041c 100644
--- a/BaseClasses.py
+++ b/BaseClasses.py
@@ -1038,6 +1038,8 @@ class CollectionState():
 
     def has_from_list(self, items: Iterable[str], player: int, count: int) -> bool:
         """Returns True if the state contains at least `count` items matching any of the item names from a list."""
+        if count <= 0:
+            return True
         found: int = 0
         player_prog_items = self.prog_items[player]
         for item_name in items:
@@ -1049,6 +1051,8 @@ class CollectionState():
     def has_from_list_unique(self, items: Iterable[str], player: int, count: int) -> bool:
         """Returns True if the state contains at least `count` items matching any of the item names from a list.
         Ignores duplicates of the same item."""
+        if count <= 0:
+            return True
         found: int = 0
         player_prog_items = self.prog_items[player]
         for item_name in items:
@@ -1077,6 +1081,8 @@ class CollectionState():
     # item name group related
     def has_group(self, item_name_group: str, player: int, count: int = 1) -> bool:
         """Returns True if the state contains at least `count` items present in a specified item group."""
+        if count <= 0:
+            return True
         found: int = 0
         player_prog_items = self.prog_items[player]
         for item_name in self.multiworld.worlds[player].item_name_groups[item_name_group]:
@@ -1089,6 +1095,8 @@ class CollectionState():
         """Returns True if the state contains at least `count` items present in a specified item group.
         Ignores duplicates of the same item.
         """
+        if count <= 0:
+            return True
         found: int = 0
         player_prog_items = self.prog_items[player]
         for item_name in self.multiworld.worlds[player].item_name_groups[item_name_group]:
diff --git a/rule_builder/rules.py b/rule_builder/rules.py
index a156848ad6..0606225ffa 100644
--- a/rule_builder/rules.py
+++ b/rule_builder/rules.py
@@ -1403,14 +1403,16 @@ class HasFromList(Rule[TWorld], game="Archipelago"):
 
     @override
     def _instantiate(self, world: TWorld) -> Rule.Resolved:
+        count = resolve_field(self.count, world, int)
+        if count <= 0:
+            return True_().resolve(world)
         if len(self.item_names) == 0:
-            # match state.has_from_list
             return False_().resolve(world)
         if len(self.item_names) == 1:
             return Has(self.item_names[0], self.count).resolve(world)
         return self.Resolved(
             self.item_names,
-            count=resolve_field(self.count, world, int),
+            count=count,
             player=world.player,
             caching_enabled=getattr(world, "rule_caching_enabled", False),
         )
@@ -1538,8 +1540,9 @@ class HasFromListUnique(Rule[TWorld], game="Archipelago"):
     @override
     def _instantiate(self, world: TWorld) -> Rule.Resolved:
         count = resolve_field(self.count, world, int)
-        if len(self.item_names) == 0 or len(self.item_names) < count:
-            # match state.has_from_list_unique
+        if count <= 0:
+            return True_().resolve(world)
+        if len(self.item_names) < count:
             return False_().resolve(world)
         if len(self.item_names) == 1:
             return Has(self.item_names[0]).resolve(world)
@@ -1657,11 +1660,14 @@ class HasGroup(Rule[TWorld], game="Archipelago"):
 
     @override
     def _instantiate(self, world: TWorld) -> Rule.Resolved:
+        count = resolve_field(self.count, world, int)
+        if count <= 0:
+            return True_().resolve(world)
         item_names = tuple(sorted(world.item_name_groups[self.item_name_group]))
         return self.Resolved(
             self.item_name_group,
             item_names,
-            count=resolve_field(self.count, world, int),
+            count=count,
             player=world.player,
             caching_enabled=getattr(world, "rule_caching_enabled", False),
         )
@@ -1731,11 +1737,16 @@ class HasGroupUnique(Rule[TWorld], game="Archipelago"):
 
     @override
     def _instantiate(self, world: TWorld) -> Rule.Resolved:
+        count = resolve_field(self.count, world, int)
+        if count <= 0:
+            return True_().resolve(world)
         item_names = tuple(sorted(world.item_name_groups[self.item_name_group]))
+        if len(item_names) < count:
+            return False_().resolve(world)
         return self.Resolved(
             self.item_name_group,
             item_names,
-            count=resolve_field(self.count, world, int),
+            count=count,
             player=world.player,
             caching_enabled=getattr(world, "rule_caching_enabled", False),
         )