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[/] [trunk/] [Libs/] [LibBabble-Zone-3.0/] [LibStub/] [LibStub.lua] - Blame information for rev 2

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1 2 Arvak-118457
-- LibStub is a simple versioning stub meant for use in Libraries.  http://www.wowace.com/wiki/LibStub for more info
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-- LibStub is hereby placed in the Public Domain Credits: Kaelten, Cladhaire, ckknight, Mikk, Ammo, Nevcairiel, joshborke
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local LIBSTUB_MAJOR, LIBSTUB_MINOR = "LibStub", 2  -- NEVER MAKE THIS AN SVN REVISION! IT NEEDS TO BE USABLE IN ALL REPOS!
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local LibStub = _G[LIBSTUB_MAJOR]
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if not LibStub or LibStub.minor < LIBSTUB_MINOR then
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        LibStub = LibStub or {libs = {}, minors = {} }
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        _G[LIBSTUB_MAJOR] = LibStub
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        LibStub.minor = LIBSTUB_MINOR
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        function LibStub:NewLibrary(major, minor)
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                assert(type(major) == "string", "Bad argument #2 to `NewLibrary' (string expected)")
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                minor = assert(tonumber(strmatch(minor, "%d+")), "Minor version must either be a number or contain a number.")
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                local oldminor = self.minors[major]
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                if oldminor and oldminor >= minor then return nil end
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                self.minors[major], self.libs[major] = minor, self.libs[major] or {}
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                return self.libs[major], oldminor
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        end
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        function LibStub:GetLibrary(major, silent)
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                if not self.libs[major] and not silent then
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                        error(("Cannot find a library instance of %q."):format(tostring(major)), 2)
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                end
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                return self.libs[major], self.minors[major]
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        end
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        function LibStub:IterateLibraries() return pairs(self.libs) end
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        setmetatable(LibStub, { __call = LibStub.GetLibrary })
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end