flickerstreak@104: -- LibStub is a simple versioning stub meant for use in Libraries.  http://www.wowace.com/wiki/LibStub for more info
flickerstreak@104: -- LibStub is hereby placed in the Public Domain Credits: Kaelten, Cladhaire, ckknight, Mikk, Ammo, Nevcairiel, joshborke
flickerstreak@104: local LIBSTUB_MAJOR, LIBSTUB_MINOR = "LibStub", 2  -- NEVER MAKE THIS AN SVN REVISION! IT NEEDS TO BE USABLE IN ALL REPOS!
flickerstreak@104: local LibStub = _G[LIBSTUB_MAJOR]
flickerstreak@104: 
flickerstreak@104: if not LibStub or LibStub.minor < LIBSTUB_MINOR then
flickerstreak@104: 	LibStub = LibStub or {libs = {}, minors = {} }
flickerstreak@104: 	_G[LIBSTUB_MAJOR] = LibStub
flickerstreak@104: 	LibStub.minor = LIBSTUB_MINOR
flickerstreak@104: 	
flickerstreak@104: 	function LibStub:NewLibrary(major, minor)
flickerstreak@104: 		assert(type(major) == "string", "Bad argument #2 to `NewLibrary' (string expected)")
flickerstreak@104: 		minor = assert(tonumber(strmatch(minor, "%d+")), "Minor version must either be a number or contain a number.")
flickerstreak@104: 		
flickerstreak@104: 		local oldminor = self.minors[major]
flickerstreak@104: 		if oldminor and oldminor >= minor then return nil end
flickerstreak@104: 		self.minors[major], self.libs[major] = minor, self.libs[major] or {}
flickerstreak@104: 		return self.libs[major], oldminor
flickerstreak@104: 	end
flickerstreak@104: 	
flickerstreak@104: 	function LibStub:GetLibrary(major, silent)
flickerstreak@104: 		if not self.libs[major] and not silent then
flickerstreak@104: 			error(("Cannot find a library instance of %q."):format(tostring(major)), 2)
flickerstreak@104: 		end
flickerstreak@104: 		return self.libs[major], self.minors[major]
flickerstreak@104: 	end
flickerstreak@104: 	
flickerstreak@104: 	function LibStub:IterateLibraries() return pairs(self.libs) end
flickerstreak@104: 	setmetatable(LibStub, { __call = LibStub.GetLibrary })
flickerstreak@104: end