448 lines
23 KiB
Python
448 lines
23 KiB
Python
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import itertools
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import logging
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import random
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import time
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from collections import deque
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from collections.abc import Callable, Iterable
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from BaseClasses import CollectionState, Entrance, Region, EntranceType
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from Options import Accessibility
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from worlds.AutoWorld import World
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class EntranceRandomizationError(RuntimeError):
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pass
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class EntranceLookup:
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class GroupLookup:
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_lookup: dict[int, list[Entrance]]
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def __init__(self):
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self._lookup = {}
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def __len__(self):
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return sum(map(len, self._lookup.values()))
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def __bool__(self):
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return bool(self._lookup)
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def __getitem__(self, item: int) -> list[Entrance]:
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return self._lookup.get(item, [])
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def __iter__(self):
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return itertools.chain.from_iterable(self._lookup.values())
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def __repr__(self):
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return str(self._lookup)
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def add(self, entrance: Entrance) -> None:
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self._lookup.setdefault(entrance.randomization_group, []).append(entrance)
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def remove(self, entrance: Entrance) -> None:
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group = self._lookup[entrance.randomization_group]
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group.remove(entrance)
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if not group:
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del self._lookup[entrance.randomization_group]
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dead_ends: GroupLookup
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others: GroupLookup
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_random: random.Random
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_expands_graph_cache: dict[Entrance, bool]
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_coupled: bool
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def __init__(self, rng: random.Random, coupled: bool):
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self.dead_ends = EntranceLookup.GroupLookup()
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self.others = EntranceLookup.GroupLookup()
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self._random = rng
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self._expands_graph_cache = {}
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self._coupled = coupled
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def _can_expand_graph(self, entrance: Entrance) -> bool:
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"""
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Checks whether an entrance is able to expand the region graph, either by
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providing access to randomizable exits or by granting access to items or
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regions used in logic conditions.
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:param entrance: A randomizable (no parent) region entrance
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"""
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# we've seen this, return cached result
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if entrance in self._expands_graph_cache:
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return self._expands_graph_cache[entrance]
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visited = set()
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q: deque[Region] = deque()
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q.append(entrance.connected_region)
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while q:
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region = q.popleft()
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visited.add(region)
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# check if the region itself is progression
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if region in region.multiworld.indirect_connections:
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self._expands_graph_cache[entrance] = True
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return True
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# check if any placed locations are progression
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for loc in region.locations:
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if loc.advancement:
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self._expands_graph_cache[entrance] = True
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return True
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# check if there is a randomized exit out (expands the graph directly) or else search any connected
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# regions to see if they are/have progression
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for exit_ in region.exits:
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# randomizable exits which are not reverse of the incoming entrance.
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# uncoupled mode is an exception because in this case going back in the door you just came in could
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# actually lead somewhere new
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if not exit_.connected_region and (not self._coupled or exit_.name != entrance.name):
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self._expands_graph_cache[entrance] = True
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return True
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elif exit_.connected_region and exit_.connected_region not in visited:
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q.append(exit_.connected_region)
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self._expands_graph_cache[entrance] = False
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return False
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def add(self, entrance: Entrance) -> None:
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lookup = self.others if self._can_expand_graph(entrance) else self.dead_ends
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lookup.add(entrance)
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def remove(self, entrance: Entrance) -> None:
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lookup = self.others if self._can_expand_graph(entrance) else self.dead_ends
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lookup.remove(entrance)
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def get_targets(
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self,
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groups: Iterable[int],
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dead_end: bool,
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preserve_group_order: bool
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) -> Iterable[Entrance]:
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lookup = self.dead_ends if dead_end else self.others
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if preserve_group_order:
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for group in groups:
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self._random.shuffle(lookup[group])
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ret = [entrance for group in groups for entrance in lookup[group]]
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else:
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ret = [entrance for group in groups for entrance in lookup[group]]
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self._random.shuffle(ret)
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return ret
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def __len__(self):
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return len(self.dead_ends) + len(self.others)
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class ERPlacementState:
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"""The state of an ongoing or completed entrance randomization"""
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placements: list[Entrance]
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"""The list of randomized Entrance objects which have been connected successfully"""
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pairings: list[tuple[str, str]]
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"""A list of pairings of connected entrance names, of the form (source_exit, target_entrance)"""
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world: World
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"""The world which is having its entrances randomized"""
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collection_state: CollectionState
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"""The CollectionState backing the entrance randomization logic"""
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coupled: bool
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"""Whether entrance randomization is operating in coupled mode"""
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def __init__(self, world: World, coupled: bool):
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self.placements = []
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self.pairings = []
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self.world = world
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self.coupled = coupled
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self.collection_state = world.multiworld.get_all_state(False, True)
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@property
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def placed_regions(self) -> set[Region]:
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return self.collection_state.reachable_regions[self.world.player]
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def find_placeable_exits(self, check_validity: bool) -> list[Entrance]:
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if check_validity:
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blocked_connections = self.collection_state.blocked_connections[self.world.player]
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blocked_connections = sorted(blocked_connections, key=lambda x: x.name)
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placeable_randomized_exits = [connection for connection in blocked_connections
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if not connection.connected_region
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and connection.is_valid_source_transition(self)]
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else:
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# this is on a beaten minimal attempt, so any exit anywhere is fair game
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placeable_randomized_exits = [ex for region in self.world.multiworld.get_regions(self.world.player)
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for ex in region.exits if not ex.connected_region]
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self.world.random.shuffle(placeable_randomized_exits)
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return placeable_randomized_exits
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def _connect_one_way(self, source_exit: Entrance, target_entrance: Entrance) -> None:
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target_region = target_entrance.connected_region
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target_region.entrances.remove(target_entrance)
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source_exit.connect(target_region)
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self.collection_state.stale[self.world.player] = True
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self.placements.append(source_exit)
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self.pairings.append((source_exit.name, target_entrance.name))
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def test_speculative_connection(self, source_exit: Entrance, target_entrance: Entrance) -> bool:
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copied_state = self.collection_state.copy()
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# simulated connection. A real connection is unsafe because the region graph is shallow-copied and would
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# propagate back to the real multiworld.
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copied_state.reachable_regions[self.world.player].add(target_entrance.connected_region)
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copied_state.blocked_connections[self.world.player].remove(source_exit)
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copied_state.blocked_connections[self.world.player].update(target_entrance.connected_region.exits)
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copied_state.update_reachable_regions(self.world.player)
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copied_state.sweep_for_advancements()
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# test that at there are newly reachable randomized exits that are ACTUALLY reachable
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available_randomized_exits = copied_state.blocked_connections[self.world.player]
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for _exit in available_randomized_exits:
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if _exit.connected_region:
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continue
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# ignore the source exit, and, if coupled, the reverse exit. They're not actually new
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if _exit.name == source_exit.name or (self.coupled and _exit.name == target_entrance.name):
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continue
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# technically this should be is_valid_source_transition, but that may rely on side effects from
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# on_connect, which have not happened here (because we didn't do a real connection, and if we did, we would
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# not want them to persist). can_reach is a close enough approximation most of the time.
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if _exit.can_reach(copied_state):
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return True
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return False
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def connect(
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self,
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source_exit: Entrance,
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target_entrance: Entrance
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) -> tuple[list[Entrance], list[Entrance]]:
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"""
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Connects a source exit to a target entrance in the graph, accounting for coupling
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:returns: The newly placed exits and the dummy entrance(s) which were removed from the graph
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"""
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source_region = source_exit.parent_region
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target_region = target_entrance.connected_region
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self._connect_one_way(source_exit, target_entrance)
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# if we're doing coupled randomization place the reverse transition as well.
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if self.coupled and source_exit.randomization_type == EntranceType.TWO_WAY:
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for reverse_entrance in source_region.entrances:
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if reverse_entrance.name == source_exit.name:
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if reverse_entrance.parent_region:
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raise EntranceRandomizationError(
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f"Could not perform coupling on {source_exit.name} -> {target_entrance.name} "
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f"because the reverse entrance is already parented to "
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f"{reverse_entrance.parent_region.name}.")
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break
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else:
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raise EntranceRandomizationError(f"Two way exit {source_exit.name} had no corresponding entrance in "
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f"{source_exit.parent_region.name}")
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for reverse_exit in target_region.exits:
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if reverse_exit.name == target_entrance.name:
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if reverse_exit.connected_region:
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raise EntranceRandomizationError(
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f"Could not perform coupling on {source_exit.name} -> {target_entrance.name} "
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f"because the reverse exit is already connected to "
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f"{reverse_exit.connected_region.name}.")
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break
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else:
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raise EntranceRandomizationError(f"Two way entrance {target_entrance.name} had no corresponding exit "
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f"in {target_region.name}.")
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self._connect_one_way(reverse_exit, reverse_entrance)
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return [source_exit, reverse_exit], [target_entrance, reverse_entrance]
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return [source_exit], [target_entrance]
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def bake_target_group_lookup(world: World, get_target_groups: Callable[[int], list[int]]) \
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-> dict[int, list[int]]:
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"""
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Applies a transformation to all known entrance groups on randomizable exists to build a group lookup table.
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:param world: Your World instance
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:param get_target_groups: Function to call that returns the groups that a specific group type is allowed to
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connect to
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"""
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unique_groups = { entrance.randomization_group for entrance in world.multiworld.get_entrances(world.player)
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if entrance.parent_region and not entrance.connected_region }
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return { group: get_target_groups(group) for group in unique_groups }
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def disconnect_entrance_for_randomization(entrance: Entrance, target_group: int | None = None) -> None:
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"""
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Given an entrance in a "vanilla" region graph, splits that entrance to prepare it for randomization
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in randomize_entrances. This should be done after setting the type and group of the entrance.
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:param entrance: The entrance which will be disconnected in preparation for randomization.
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:param target_group: The group to assign to the created ER target. If not specified, the group from
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the original entrance will be copied.
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"""
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child_region = entrance.connected_region
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parent_region = entrance.parent_region
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# disconnect the edge
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child_region.entrances.remove(entrance)
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entrance.connected_region = None
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# create the needed ER target
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if entrance.randomization_type == EntranceType.TWO_WAY:
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# for 2-ways, create a target in the parent region with a matching name to support coupling.
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# targets in the child region will be created when the other direction edge is disconnected
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target = parent_region.create_er_target(entrance.name)
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else:
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# for 1-ways, the child region needs a target and coupling/naming is not a concern
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target = child_region.create_er_target(child_region.name)
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target.randomization_type = entrance.randomization_type
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target.randomization_group = target_group or entrance.randomization_group
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def randomize_entrances(
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world: World,
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coupled: bool,
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target_group_lookup: dict[int, list[int]],
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preserve_group_order: bool = False,
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er_targets: list[Entrance] | None = None,
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exits: list[Entrance] | None = None,
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on_connect: Callable[[ERPlacementState, list[Entrance]], None] | None = None
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) -> ERPlacementState:
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"""
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Randomizes Entrances for a single world in the multiworld.
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:param world: Your World instance
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:param coupled: Whether connected entrances should be coupled to go in both directions
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:param target_group_lookup: Map from each group to a list of the groups that it can be connect to. Every group
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used on an exit must be provided and must map to at least one other group. The default
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group is 0.
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:param preserve_group_order: Whether the order of groupings should be preserved for the returned target_groups
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:param er_targets: The list of ER targets (Entrance objects with no parent region) to use for randomization.
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Remember to be deterministic! If not provided, automatically discovers all valid targets
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in your world.
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:param exits: The list of exits (Entrance objects with no target region) to use for randomization.
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Remember to be deterministic! If not provided, automatically discovers all valid exits in your world.
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:param on_connect: A callback function which allows specifying side effects after a placement is completed
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successfully and the underlying collection state has been updated.
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"""
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if not world.explicit_indirect_conditions:
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raise EntranceRandomizationError("Entrance randomization requires explicit indirect conditions in order "
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+ "to correctly analyze whether dead end regions can be required in logic.")
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start_time = time.perf_counter()
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er_state = ERPlacementState(world, coupled)
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entrance_lookup = EntranceLookup(world.random, coupled)
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# similar to fill, skip validity checks on entrances if the game is beatable on minimal accessibility
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perform_validity_check = True
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def do_placement(source_exit: Entrance, target_entrance: Entrance) -> None:
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placed_exits, removed_entrances = er_state.connect(source_exit, target_entrance)
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# remove the placed targets from consideration
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for entrance in removed_entrances:
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entrance_lookup.remove(entrance)
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# propagate new connections
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er_state.collection_state.update_reachable_regions(world.player)
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er_state.collection_state.sweep_for_advancements()
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if on_connect:
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on_connect(er_state, placed_exits)
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def find_pairing(dead_end: bool, require_new_exits: bool) -> bool:
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nonlocal perform_validity_check
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placeable_exits = er_state.find_placeable_exits(perform_validity_check)
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|
for source_exit in placeable_exits:
|
||
|
|
target_groups = target_group_lookup[source_exit.randomization_group]
|
||
|
|
for target_entrance in entrance_lookup.get_targets(target_groups, dead_end, preserve_group_order):
|
||
|
|
# when requiring new exits, ideally we would like to make it so that every placement increases
|
||
|
|
# (or keeps the same number of) reachable exits. The goal is to continue to expand the search space
|
||
|
|
# so that we do not crash. In the interest of performance and bias reduction, generally, just checking
|
||
|
|
# that we are going to a new region is a good approximation. however, we should take extra care on the
|
||
|
|
# very last exit and check whatever exits we open up are functionally accessible.
|
||
|
|
# this requirement can be ignored on a beaten minimal, islands are no issue there.
|
||
|
|
exit_requirement_satisfied = (not perform_validity_check or not require_new_exits
|
||
|
|
or target_entrance.connected_region not in er_state.placed_regions)
|
||
|
|
needs_speculative_sweep = (not dead_end and require_new_exits and perform_validity_check
|
||
|
|
and len(placeable_exits) == 1)
|
||
|
|
if exit_requirement_satisfied and source_exit.can_connect_to(target_entrance, dead_end, er_state):
|
||
|
|
if (needs_speculative_sweep
|
||
|
|
and not er_state.test_speculative_connection(source_exit, target_entrance)):
|
||
|
|
continue
|
||
|
|
do_placement(source_exit, target_entrance)
|
||
|
|
return True
|
||
|
|
else:
|
||
|
|
# no source exits had any valid target so this stage is deadlocked. retries may be implemented if early
|
||
|
|
# deadlocking is a frequent issue.
|
||
|
|
lookup = entrance_lookup.dead_ends if dead_end else entrance_lookup.others
|
||
|
|
|
||
|
|
# if we're in a stage where we're trying to get to new regions, we could also enter this
|
||
|
|
# branch in a success state (when all regions of the preferred type have been placed, but there are still
|
||
|
|
# additional unplaced entrances into those regions)
|
||
|
|
if require_new_exits:
|
||
|
|
if all(e.connected_region in er_state.placed_regions for e in lookup):
|
||
|
|
return False
|
||
|
|
|
||
|
|
# if we're on minimal accessibility and can guarantee the game is beatable,
|
||
|
|
# we can prevent a failure by bypassing future validity checks. this check may be
|
||
|
|
# expensive; fortunately we only have to do it once
|
||
|
|
if perform_validity_check and world.options.accessibility == Accessibility.option_minimal \
|
||
|
|
and world.multiworld.has_beaten_game(er_state.collection_state, world.player):
|
||
|
|
# ensure that we have enough locations to place our progression
|
||
|
|
accessible_location_count = 0
|
||
|
|
prog_item_count = sum(er_state.collection_state.prog_items[world.player].values())
|
||
|
|
# short-circuit location checking in this case
|
||
|
|
if prog_item_count == 0:
|
||
|
|
return True
|
||
|
|
for region in er_state.placed_regions:
|
||
|
|
for loc in region.locations:
|
||
|
|
if loc.can_reach(er_state.collection_state):
|
||
|
|
accessible_location_count += 1
|
||
|
|
if accessible_location_count >= prog_item_count:
|
||
|
|
perform_validity_check = False
|
||
|
|
# pretend that this was successful to retry the current stage
|
||
|
|
return True
|
||
|
|
|
||
|
|
unplaced_entrances = [entrance for region in world.multiworld.get_regions(world.player)
|
||
|
|
for entrance in region.entrances if not entrance.parent_region]
|
||
|
|
unplaced_exits = [exit_ for region in world.multiworld.get_regions(world.player)
|
||
|
|
for exit_ in region.exits if not exit_.connected_region]
|
||
|
|
entrance_kind = "dead ends" if dead_end else "non-dead ends"
|
||
|
|
region_access_requirement = "requires" if require_new_exits else "does not require"
|
||
|
|
raise EntranceRandomizationError(
|
||
|
|
f"None of the available entrances are valid targets for the available exits.\n"
|
||
|
|
f"Randomization stage is placing {entrance_kind} and {region_access_requirement} "
|
||
|
|
f"new region/exit access by default\n"
|
||
|
|
f"Placeable entrances: {lookup}\n"
|
||
|
|
f"Placeable exits: {placeable_exits}\n"
|
||
|
|
f"All unplaced entrances: {unplaced_entrances}\n"
|
||
|
|
f"All unplaced exits: {unplaced_exits}")
|
||
|
|
|
||
|
|
if not er_targets:
|
||
|
|
er_targets = sorted([entrance for region in world.multiworld.get_regions(world.player)
|
||
|
|
for entrance in region.entrances if not entrance.parent_region], key=lambda x: x.name)
|
||
|
|
if not exits:
|
||
|
|
exits = sorted([ex for region in world.multiworld.get_regions(world.player)
|
||
|
|
for ex in region.exits if not ex.connected_region], key=lambda x: x.name)
|
||
|
|
if len(er_targets) != len(exits):
|
||
|
|
raise EntranceRandomizationError(f"Unable to randomize entrances due to a mismatched count of "
|
||
|
|
f"entrances ({len(er_targets)}) and exits ({len(exits)}.")
|
||
|
|
for entrance in er_targets:
|
||
|
|
entrance_lookup.add(entrance)
|
||
|
|
|
||
|
|
# place the menu region and connected start region(s)
|
||
|
|
er_state.collection_state.update_reachable_regions(world.player)
|
||
|
|
|
||
|
|
# stage 1 - try to place all the non-dead-end entrances
|
||
|
|
while entrance_lookup.others:
|
||
|
|
if not find_pairing(dead_end=False, require_new_exits=True):
|
||
|
|
break
|
||
|
|
# stage 2 - try to place all the dead-end entrances
|
||
|
|
while entrance_lookup.dead_ends:
|
||
|
|
if not find_pairing(dead_end=True, require_new_exits=True):
|
||
|
|
break
|
||
|
|
# stage 3 - all the regions should be placed at this point. We now need to connect dangling edges
|
||
|
|
# stage 3a - get the rest of the dead ends (e.g. second entrances into already-visited regions)
|
||
|
|
# doing this before the non-dead-ends is important to ensure there are enough connections to
|
||
|
|
# go around
|
||
|
|
while entrance_lookup.dead_ends:
|
||
|
|
find_pairing(dead_end=True, require_new_exits=False)
|
||
|
|
# stage 3b - tie all the other loose ends connecting visited regions to each other
|
||
|
|
while entrance_lookup.others:
|
||
|
|
find_pairing(dead_end=False, require_new_exits=False)
|
||
|
|
|
||
|
|
running_time = time.perf_counter() - start_time
|
||
|
|
if running_time > 1.0:
|
||
|
|
logging.info(f"Took {running_time:.4f} seconds during entrance randomization for player {world.player},"
|
||
|
|
f"named {world.multiworld.player_name[world.player]}")
|
||
|
|
|
||
|
|
return er_state
|