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1 -- $Id: LibStub.lua 76 2007-09-03 01:50:17Z mikk $
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2 -- LibStub is a simple versioning stub meant for use in Libraries. http://www.wowace.com/wiki/LibStub for more info
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3 -- LibStub is hereby placed in the Public Domain
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4 -- Credits: Kaelten, Cladhaire, ckknight, Mikk, Ammo, Nevcairiel, joshborke
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5 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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6 local LibStub = _G[LIBSTUB_MAJOR]
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7
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8 -- Check to see is this version of the stub is obsolete
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9 if not LibStub or LibStub.minor < LIBSTUB_MINOR then
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10 LibStub = LibStub or {libs = {}, minors = {} }
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11 _G[LIBSTUB_MAJOR] = LibStub
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12 LibStub.minor = LIBSTUB_MINOR
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13
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14 -- LibStub:NewLibrary(major, minor)
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15 -- major (string) - the major version of the library
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16 -- minor (string or number ) - the minor version of the library
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17 --
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18 -- returns nil if a newer or same version of the lib is already present
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19 -- returns empty library object or old library object if upgrade is needed
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20 function LibStub:NewLibrary(major, minor)
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21 assert(type(major) == "string", "Bad argument #2 to `NewLibrary' (string expected)")
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22 minor = assert(tonumber(strmatch(minor, "%d+")), "Minor version must either be a number or contain a number.")
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23
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24 local oldminor = self.minors[major]
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25 if oldminor and oldminor >= minor then return nil end
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26 self.minors[major], self.libs[major] = minor, self.libs[major] or {}
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27 return self.libs[major], oldminor
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28 end
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29
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30 -- LibStub:GetLibrary(major, [silent])
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31 -- major (string) - the major version of the library
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32 -- silent (boolean) - if true, library is optional, silently return nil if its not found
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33 --
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34 -- throws an error if the library can not be found (except silent is set)
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35 -- returns the library object if found
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36 function LibStub:GetLibrary(major, silent)
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37 if not self.libs[major] and not silent then
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38 error(("Cannot find a library instance of %q."):format(tostring(major)), 2)
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39 end
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40 return self.libs[major], self.minors[major]
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41 end
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42
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43 -- LibStub:IterateLibraries()
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44 --
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45 -- Returns an iterator for the currently registered libraries
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46 function LibStub:IterateLibraries()
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47 return pairs(self.libs)
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48 end
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49
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50 setmetatable(LibStub, { __call = LibStub.GetLibrary })
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51 end
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