52 lines
2.1 KiB
Lua
52 lines
2.1 KiB
Lua
-- $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
|
|
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]
|
|
|
|
-- Check to see is this version of the stub is obsolete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
|
|
|
|
-- 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
|
|
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.")
|
|
|
|
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
|
|
|
|
-- 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
|
|
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
|
|
|
|
-- LibStub:IterateLibraries()
|
|
--
|
|
-- Returns an iterator for the currently registered libraries
|
|
function LibStub:IterateLibraries()
|
|
return pairs(self.libs)
|
|
end
|
|
|
|
setmetatable(LibStub, { __call = LibStub.GetLibrary })
|
|
end
|