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-- $Id: LibStub.lua 103 2014-10-16 03:02:50Z mikk $ | ||
-- LibStub is a simple versioning stub meant for use in Libraries. http://www.wowace.com/addons/libstub/ for more info | ||
-- LibStub is hereby placed in the Public Domain | ||
-- Credits: Kaelten, Cladhaire, ckknight, Mikk, Ammo, Nevcairiel, joshborke | ||
-- 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] | ||
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-- Check to see is this version of the stub is obsolete | ||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 | ||
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-- 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 | ||
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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.") | ||
minor = assert(tonumber(string.match(minor, "%d+")), "Minor version must either be a number or contain a number.") | ||
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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 | ||
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-- 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 | ||
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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 | ||
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-- LibStub:IterateLibraries() | ||
-- | ||
-- Returns an iterator for the currently registered libraries | ||
function LibStub:IterateLibraries() | ||
return pairs(self.libs) | ||
end | ||
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function LibStub:IterateLibraries() return pairs(self.libs) end | ||
setmetatable(LibStub, { __call = LibStub.GetLibrary }) | ||
end |