core: utility method for visualizing worlds as PlantUML (#1935)

* core: typing for MultiWorld.get_regions

* core: utility method for visualizing worlds as PlantUML

* core: utility method for visualizing worlds as PlantUML: update docs

.gitignore

@@ -27,6 +27,7 @@
 *.archipelago
 *.apsave
 *.BIN
+*.puml
 
 setups
 build

BaseClasses.py

@@ -8,6 +8,7 @@
 import typing  # this can go away when Python 3.8 support is dropped
 from argparse import Namespace
 from collections import ChainMap, Counter, deque
+from collections.abc import Collection
 from enum import IntEnum, IntFlag
 from typing import Any, Callable, Dict, Iterable, Iterator, List, NamedTuple, Optional, Set, Tuple, TypedDict, Union, \
     Type, ClassVar
@@ -357,7 +358,7 @@ def _recache(self):
             for r_location in region.locations:
                 self._location_cache[r_location.name, player] = r_location
 
-    def get_regions(self, player=None):
+    def get_regions(self, player: Optional[int] = None) -> Collection[Region]:
         return self.regions if player is None else self._region_cache[player].values()
 
     def get_region(self, regionname: str, player: int) -> Region:

Utils.py

@@ -29,6 +29,7 @@
 if typing.TYPE_CHECKING:
     import tkinter
     import pathlib
+    from BaseClasses import Region
 
 
 def tuplize_version(version: str) -> Version:
@@ -766,3 +767,113 @@ def freeze_support() -> None:
     import multiprocessing
     _extend_freeze_support()
     multiprocessing.freeze_support()
+
+
+def visualize_regions(root_region: Region, file_name: str, *,
+                      show_entrance_names: bool = False, show_locations: bool = True, show_other_regions: bool = True,
+                      linetype_ortho: bool = True) -> None:
+    """Visualize the layout of a world as a PlantUML diagram.
+
+    :param root_region: The region from which to start the diagram from. (Usually the "Menu" region of your world.)
+    :param file_name: The name of the destination .puml file.
+    :param show_entrance_names: (default False) If enabled, the name of the entrance will be shown near each connection.
+    :param show_locations: (default True) If enabled, the locations will be listed inside each region.
+            Priority locations will be shown in bold.
+            Excluded locations will be stricken out.
+            Locations without ID will be shown in italics.
+            Locked locations will be shown with a padlock icon.
+            For filled locations, the item name will be shown after the location name.
+            Progression items will be shown in bold.
+            Items without ID will be shown in italics.
+    :param show_other_regions: (default True) If enabled, regions that can't be reached by traversing exits are shown.
+    :param linetype_ortho: (default True) If enabled, orthogonal straight line parts will be used; otherwise polylines.
+
+    Example usage in World code:
+    from Utils import visualize_regions
+    visualize_regions(self.multiworld.get_region("Menu", self.player), "my_world.puml")
+
+    Example usage in Main code:
+    from Utils import visualize_regions
+    for player in world.player_ids:
+        visualize_regions(world.get_region("Menu", player), f"{world.get_out_file_name_base(player)}.puml")
+    """
+    assert root_region.multiworld, "The multiworld attribute of root_region has to be filled"
+    from BaseClasses import Entrance, Item, Location, LocationProgressType, MultiWorld, Region
+    from collections import deque
+    import re
+
+    uml: typing.List[str] = list()
+    seen: typing.Set[Region] = set()
+    regions: typing.Deque[Region] = deque((root_region,))
+    multiworld: MultiWorld = root_region.multiworld
+
+    def fmt(obj: Union[Entrance, Item, Location, Region]) -> str:
+        name = obj.name
+        if isinstance(obj, Item):
+            name = multiworld.get_name_string_for_object(obj)
+            if obj.advancement:
+                name = f"**{name}**"
+            if obj.code is None:
+                name = f"//{name}//"
+        if isinstance(obj, Location):
+            if obj.progress_type == LocationProgressType.PRIORITY:
+                name = f"**{name}**"
+            elif obj.progress_type == LocationProgressType.EXCLUDED:
+                name = f"--{name}--"
+            if obj.address is None:
+                name = f"//{name}//"
+        return re.sub("[\".:]", "", name)
+
+    def visualize_exits(region: Region) -> None:
+        for exit_ in region.exits:
+            if exit_.connected_region:
+                if show_entrance_names:
+                    uml.append(f"\"{fmt(region)}\" --> \"{fmt(exit_.connected_region)}\" : \"{fmt(exit_)}\"")
+                else:
+                    try:
+                        uml.remove(f"\"{fmt(exit_.connected_region)}\" --> \"{fmt(region)}\"")
+                        uml.append(f"\"{fmt(exit_.connected_region)}\" <--> \"{fmt(region)}\"")
+                    except ValueError:
+                        uml.append(f"\"{fmt(region)}\" --> \"{fmt(exit_.connected_region)}\"")
+            else:
+                uml.append(f"circle \"unconnected exit:\\n{fmt(exit_)}\"")
+                uml.append(f"\"{fmt(region)}\" --> \"unconnected exit:\\n{fmt(exit_)}\"")
+
+    def visualize_locations(region: Region) -> None:
+        any_lock = any(location.locked for location in region.locations)
+        for location in region.locations:
+            lock = "<&lock-locked> " if location.locked else "<&lock-unlocked,color=transparent> " if any_lock else ""
+            if location.item:
+                uml.append(f"\"{fmt(region)}\" : {{method}} {lock}{fmt(location)}: {fmt(location.item)}")
+            else:
+                uml.append(f"\"{fmt(region)}\" : {{field}} {lock}{fmt(location)}")
+
+    def visualize_region(region: Region) -> None:
+        uml.append(f"class \"{fmt(region)}\"")
+        if show_locations:
+            visualize_locations(region)
+        visualize_exits(region)
+
+    def visualize_other_regions() -> None:
+        if other_regions := [region for region in multiworld.get_regions(root_region.player) if region not in seen]:
+            uml.append("package \"other regions\" <<Cloud>> {")
+            for region in other_regions:
+                uml.append(f"class \"{fmt(region)}\"")
+            uml.append("}")
+
+    uml.append("@startuml")
+    uml.append("hide circle")
+    uml.append("hide empty members")
+    if linetype_ortho:
+        uml.append("skinparam linetype ortho")
+    while regions:
+        if (current_region := regions.popleft()) not in seen:
+            seen.add(current_region)
+            visualize_region(current_region)
+            regions.extend(exit_.connected_region for exit_ in current_region.exits if exit_.connected_region)
+    if show_other_regions:
+        visualize_other_regions()
+    uml.append("@enduml")
+
+    with open(file_name, "wt", encoding="utf-8") as f:
+        f.write("\n".join(uml))

docs/world api.md

@@ -559,6 +559,12 @@ def generate_basic(self) -> None:
     # in most cases it's better to do this at the same time the itempool is
     # filled to avoid accidental duplicates:
     # manually placed and still in the itempool
+
+    # for debugging purposes, you may want to visualize the layout of your world. Uncomment the following code to
+    # write a PlantUML diagram to the file "my_world.puml" that can help you see whether your regions and locations
+    # are connected and placed as desired
+    # from Utils import visualize_regions
+    # visualize_regions(self.multiworld.get_region("Menu", self.player), "my_world.puml")
 ```
 
 ### Setting Rules