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ChoreTracker/Libs/LibQTip-1.0/LibStub/LibStub.lua

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Lua

-- $Id: LibStub.lua 76 2007-09-03 01:50:17Z mikk $
-- LibStub is a simple versioning stub meant for use in Libraries. http://www.wowace.com/wiki/LibStub for more info
-- LibStub is hereby placed in the Public Domain
-- Credits: Kaelten, Cladhaire, ckknight, Mikk, Ammo, Nevcairiel, joshborke
local LIBSTUB_MAJOR, LIBSTUB_MINOR = "LibStub", 2 -- NEVER MAKE THIS AN SVN REVISION! IT NEEDS TO BE USABLE IN ALL REPOS!
local LibStub = _G[LIBSTUB_MAJOR]
-- Check to see is this version of the stub is obsolete
if not LibStub or LibStub.minor < LIBSTUB_MINOR then
LibStub = LibStub or {libs = {}, minors = {} }
_G[LIBSTUB_MAJOR] = LibStub
LibStub.minor = LIBSTUB_MINOR
-- LibStub:NewLibrary(major, minor)
-- major (string) - the major version of the library
-- minor (string or number ) - the minor version of the library
--
-- returns nil if a newer or same version of the lib is already present
-- returns empty library object or old library object if upgrade is needed
function LibStub:NewLibrary(major, minor)
assert(type(major) == "string", "Bad argument #2 to `NewLibrary' (string expected)")
minor = assert(tonumber(strmatch(minor, "%d+")), "Minor version must either be a number or contain a number.")
local oldminor = self.minors[major]
if oldminor and oldminor >= minor then return nil end
self.minors[major], self.libs[major] = minor, self.libs[major] or {}
return self.libs[major], oldminor
end
-- LibStub:GetLibrary(major, [silent])
-- major (string) - the major version of the library
-- silent (boolean) - if true, library is optional, silently return nil if its not found
--
-- throws an error if the library can not be found (except silent is set)
-- returns the library object if found
function LibStub:GetLibrary(major, silent)
if not self.libs[major] and not silent then
error(("Cannot find a library instance of %q."):format(tostring(major)), 2)
end
return self.libs[major], self.minors[major]
end
-- LibStub:IterateLibraries()
--
-- Returns an iterator for the currently registered libraries
function LibStub:IterateLibraries()
return pairs(self.libs)
end
setmetatable(LibStub, { __call = LibStub.GetLibrary })
end