initial commit

src/mods/Registry.lua

@@ -0,0 +1,38 @@
+-- Ordered, namespaced registries used by the native mod API.
+-- Mods register definitions here; the loader merges them into the live data
+-- only after every enabled mod has initialized successfully.
+local Registry = {}
+Registry.__index = Registry
+
+function Registry.new(name)
+  return setmetatable({ name = name, values = {}, owners = {} }, Registry)
+end
+
+function Registry:register(id, value, owner, replace)
+  assert(type(id) == "string" and id ~= "", self.name .. " id is required")
+  assert(value ~= nil, self.name .. " value is required for " .. id)
+  if self.values[id] ~= nil and not replace then
+    error(("%s already registered: %s"):format(self.name, id))
+  end
+  self.values[id] = value
+  self.owners[id] = owner
+  return value
+end
+
+function Registry:override(id, value, owner)
+  return self:register(id, value, owner, true)
+end
+
+function Registry:get(id)
+  return self.values[id]
+end
+
+function Registry:has(id)
+  return self.values[id] ~= nil
+end
+
+function Registry:items()
+  return self.values
+end
+
+return Registry