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adam@3
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1 -- LibStub is a simple versioning stub meant for use in Libraries. http://www.wowace.com/wiki/LibStub for more info
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yellowfive@57
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2 -- LibStub is hereby placed in the Public Domain Credits: Kaelten, Cladhaire, ckknight, Mikk, Ammo, Nevcairiel, joshborke
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adam@3
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3 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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adam@3
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4 local LibStub = _G[LIBSTUB_MAJOR]
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adam@3
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5
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adam@3
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6 if not LibStub or LibStub.minor < LIBSTUB_MINOR then
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adam@3
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7 LibStub = LibStub or {libs = {}, minors = {} }
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adam@3
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8 _G[LIBSTUB_MAJOR] = LibStub
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adam@3
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9 LibStub.minor = LIBSTUB_MINOR
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adam@3
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10
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adam@3
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11 function LibStub:NewLibrary(major, minor)
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adam@3
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12 assert(type(major) == "string", "Bad argument #2 to `NewLibrary' (string expected)")
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adam@3
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13 minor = assert(tonumber(strmatch(minor, "%d+")), "Minor version must either be a number or contain a number.")
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adam@3
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14
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adam@3
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15 local oldminor = self.minors[major]
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adam@3
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16 if oldminor and oldminor >= minor then return nil end
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adam@3
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17 self.minors[major], self.libs[major] = minor, self.libs[major] or {}
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adam@3
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18 return self.libs[major], oldminor
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adam@3
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19 end
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adam@3
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20
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adam@3
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21 function LibStub:GetLibrary(major, silent)
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adam@3
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22 if not self.libs[major] and not silent then
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adam@3
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23 error(("Cannot find a library instance of %q."):format(tostring(major)), 2)
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adam@3
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24 end
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adam@3
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25 return self.libs[major], self.minors[major]
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adam@3
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26 end
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adam@3
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27
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yellowfive@57
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28 function LibStub:IterateLibraries() return pairs(self.libs) end
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adam@3
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29 setmetatable(LibStub, { __call = LibStub.GetLibrary })
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adam@3
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30 end
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