52 lines
2.2 KiB
Lua
52 lines
2.2 KiB
Lua
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-- $Id: LibStub.lua 76 2007-09-03 01:50:17Z mikk $
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-- 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
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-- 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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-- Check to see is this version of the stub is obsolete
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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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-- LibStub:NewLibrary(major, minor)
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-- major (string) - the major version of the library
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-- minor (string or number ) - the minor version of the library
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--
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-- returns nil if a newer or same version of the lib is already present
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-- returns empty library object or old library object if upgrade is needed
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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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-- LibStub:GetLibrary(major, [silent])
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-- major (string) - the major version of the library
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-- silent (boolean) - if true, library is optional, silently return nil if its not found
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--
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-- throws an error if the library can not be found (except silent is set)
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-- returns the library object if found
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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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-- LibStub:IterateLibraries()
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--
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-- Returns an iterator for the currently registered libraries
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function LibStub:IterateLibraries()
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return pairs(self.libs)
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end
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setmetatable(LibStub, { __call = LibStub.GetLibrary })
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end
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