feat(core): add tile registry and terrain properties

src/tiles.lua

@@ -0,0 +1,53 @@
+-- Central registry of tile glyphs and their terrain properties. Every module
+-- that needs to know whether a cell can be stood on, blocks sight, or is a door
+-- consults this table instead of hardcoding glyph comparisons.
+
+local Tiles = {}
+
+Tiles.WALL = "#"
+Tiles.FLOOR = "."
+Tiles.STAIRS_DOWN = ">"
+Tiles.STAIRS_UP = "<"
+Tiles.DOOR_CLOSED = "+"
+Tiles.DOOR_OPEN = "'"
+Tiles.DOOR_LOCKED = "x"
+Tiles.TRAP = "^"
+Tiles.WATER = "~"
+Tiles.RUBBLE = ":"
+
+local props = {
+  [Tiles.WALL]        = { walkable = false, blocksSight = true,  door = false },
+  [Tiles.FLOOR]       = { walkable = true,  blocksSight = false, door = false },
+  [Tiles.STAIRS_DOWN] = { walkable = true,  blocksSight = false, door = false },
+  [Tiles.STAIRS_UP]   = { walkable = true,  blocksSight = false, door = false },
+  [Tiles.DOOR_CLOSED] = { walkable = false, blocksSight = true,  door = true },
+  [Tiles.DOOR_LOCKED] = { walkable = false, blocksSight = true,  door = true, locked = true },
+  [Tiles.DOOR_OPEN]   = { walkable = true,  blocksSight = false, door = true },
+  [Tiles.TRAP]        = { walkable = true,  blocksSight = false, door = false },
+  [Tiles.WATER]       = { walkable = true,  blocksSight = false, door = false },
+  [Tiles.RUBBLE]      = { walkable = true,  blocksSight = false, door = false },
+}
+
+local wallProps = props[Tiles.WALL]
+
+function Tiles.of(glyph)
+  return props[glyph] or wallProps
+end
+
+function Tiles.isWalkable(glyph)
+  return Tiles.of(glyph).walkable
+end
+
+function Tiles.blocksSight(glyph)
+  return Tiles.of(glyph).blocksSight
+end
+
+function Tiles.isDoor(glyph)
+  return Tiles.of(glyph).door
+end
+
+function Tiles.isClosedDoor(glyph)
+  return glyph == Tiles.DOOR_CLOSED or glyph == Tiles.DOOR_LOCKED
+end
+
+return Tiles