Core: introduce finalize_multiworld and pre_output stages (#5700)

Co-authored-by: Ishigh1 <bonjour940@yahoo.fr>
Co-authored-by: Duck <31627079+duckboycool@users.noreply.github.com>
Co-authored-by: black-sliver <59490463+black-sliver@users.noreply.github.com>

Main.py

@@ -207,6 +207,9 @@ def main(args, seed=None, baked_server_options: dict[str, object] | None = None)
     else:
         logger.info("Progression balancing skipped.")
 
+    AutoWorld.call_all(multiworld, "finalize_multiworld")
+    AutoWorld.call_all(multiworld, "pre_output")
+
     # we're about to output using multithreading, so we're removing the global random state to prevent accidental use
     multiworld.random.passthrough = False
 

test/bases.py

@@ -248,6 +248,7 @@ class WorldTestBase(unittest.TestCase):
         with self.subTest("Game", game=self.game, seed=self.multiworld.seed):
             distribute_items_restrictive(self.multiworld)
             call_all(self.multiworld, "post_fill")
+            call_all(self.multiworld, "finalize_multiworld")
             self.assertTrue(fulfills_accessibility(), "Collected all locations, but can't beat the game.")
             placed_items = [loc.item for loc in self.multiworld.get_locations() if loc.item and loc.item.code]
             self.assertLessEqual(len(self.multiworld.itempool), len(placed_items),

test/general/test_ids.py

@@ -88,6 +88,7 @@ class TestIDs(unittest.TestCase):
                 multiworld = setup_solo_multiworld(world_type)
                 distribute_items_restrictive(multiworld)
                 call_all(multiworld, "post_fill")
+                call_all(multiworld, "finalize_multiworld")
                 datapackage = world_type.get_data_package_data()
                 for item_group, item_names in datapackage["item_name_groups"].items():
                     self.assertIsInstance(item_group, str,

test/general/test_implemented.py

@@ -46,6 +46,8 @@ class TestImplemented(unittest.TestCase):
             with self.subTest(game=game_name, seed=multiworld.seed):
                 distribute_items_restrictive(multiworld)
                 call_all(multiworld, "post_fill")
+                call_all(multiworld, "finalize_multiworld")
+                call_all(multiworld, "pre_output")
                 for key, data in multiworld.worlds[1].fill_slot_data().items():
                     self.assertIsInstance(key, str, "keys in slot data must be a string")
                     convert_to_base_types(data)  # only put base data types into slot data
@@ -93,6 +95,7 @@ class TestImplemented(unittest.TestCase):
             with self.subTest(game=game_name, seed=multiworld.seed):
                 distribute_items_restrictive(multiworld)
                 call_all(multiworld, "post_fill")
+                call_all(multiworld, "finalize_multiworld")
 
                 # Note: `multiworld.get_spheres()` iterates a set of locations, so the order that locations are checked
                 # is nondeterministic and may vary between runs with the same seed.

test/general/test_items.py

@@ -123,6 +123,7 @@ class TestBase(unittest.TestCase):
             call_all(multiworld, "pre_fill")
             distribute_items_restrictive(multiworld)
             call_all(multiworld, "post_fill")
+            call_all(multiworld, "finalize_multiworld")
             self.assertTrue(multiworld.can_beat_game(CollectionState(multiworld)), f"seed = {multiworld.seed}")
 
         for game_name, world_type in AutoWorldRegister.world_types.items():

test/multiworld/test_multiworlds.py

@@ -61,6 +61,7 @@ class TestAllGamesMultiworld(MultiworldTestBase):
         with self.subTest("filling multiworld", seed=self.multiworld.seed):
             distribute_items_restrictive(self.multiworld)
             call_all(self.multiworld, "post_fill")
+            call_all(self.multiworld, "finalize_multiworld")
             self.assertTrue(self.fulfills_accessibility(), "Collected all locations, but can't beat the game")
 
 
@@ -78,4 +79,5 @@ class TestTwoPlayerMulti(MultiworldTestBase):
         with self.subTest("filling multiworld", games=world_type.game, seed=self.multiworld.seed):
             distribute_items_restrictive(self.multiworld)
             call_all(self.multiworld, "post_fill")
+            call_all(self.multiworld, "finalize_multiworld")
             self.assertTrue(self.fulfills_accessibility(), "Collected all locations, but can't beat the game")

worlds/AutoWorld.py

@@ -430,6 +430,23 @@ class World(metaclass=AutoWorldRegister):
         This happens before progression balancing, so the items may not be in their final locations yet.
         """
 
+    def finalize_multiworld(self) -> None:
+        """
+        Optional Method that is called after fill and progression balancing.
+        This is the last stage of generation where worlds may change logically relevant data,
+        such as item placements and connections. To not break assumptions,
+        only ever increase accessibility, never decrease it.
+        """
+        pass
+
+    def pre_output(self):
+        """
+        Optional method that is called before output generation.
+        Items and connections are not meant to be moved anymore,
+        anything that would affect logical spheres is forbidden at this point.
+        """
+        pass
+
     def generate_output(self, output_directory: str) -> None:
         """
         This method gets called from a threadpool, do not use multiworld.random here.