adam@3: -- LibStub is a simple versioning stub meant for use in Libraries.  http://www.wowace.com/wiki/LibStub for more info
yellowfive@57: -- LibStub is hereby placed in the Public Domain Credits: Kaelten, Cladhaire, ckknight, Mikk, Ammo, Nevcairiel, joshborke
adam@3: local LIBSTUB_MAJOR, LIBSTUB_MINOR = "LibStub", 2  -- NEVER MAKE THIS AN SVN REVISION! IT NEEDS TO BE USABLE IN ALL REPOS!
adam@3: local LibStub = _G[LIBSTUB_MAJOR]
adam@3: 
adam@3: if not LibStub or LibStub.minor < LIBSTUB_MINOR then
adam@3: 	LibStub = LibStub or {libs = {}, minors = {} }
adam@3: 	_G[LIBSTUB_MAJOR] = LibStub
adam@3: 	LibStub.minor = LIBSTUB_MINOR
adam@3: 	
adam@3: 	function LibStub:NewLibrary(major, minor)
adam@3: 		assert(type(major) == "string", "Bad argument #2 to `NewLibrary' (string expected)")
adam@3: 		minor = assert(tonumber(strmatch(minor, "%d+")), "Minor version must either be a number or contain a number.")
adam@3: 		
adam@3: 		local oldminor = self.minors[major]
adam@3: 		if oldminor and oldminor >= minor then return nil end
adam@3: 		self.minors[major], self.libs[major] = minor, self.libs[major] or {}
adam@3: 		return self.libs[major], oldminor
adam@3: 	end
adam@3: 	
adam@3: 	function LibStub:GetLibrary(major, silent)
adam@3: 		if not self.libs[major] and not silent then
adam@3: 			error(("Cannot find a library instance of %q."):format(tostring(major)), 2)
adam@3: 		end
adam@3: 		return self.libs[major], self.minors[major]
adam@3: 	end
adam@3: 	
yellowfive@57: 	function LibStub:IterateLibraries() return pairs(self.libs) end
adam@3: 	setmetatable(LibStub, { __call = LibStub.GetLibrary })
adam@3: end