mirror of
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33 lines
No EOL
999 B
Lua
33 lines
No EOL
999 B
Lua
--- Systems
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-- Container for registered SystemClasses
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local PATH = (...):gsub('%.[^%.]+$', '')
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local Type = require(PATH..".type")
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local Systems = {}
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--- Registers a SystemClass.
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-- @param name Name to register under
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-- @param systemClass SystemClass to register
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function Systems.register(name, systemClass)
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if (type(name) ~= "string") then
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error("bad argument #1 to 'Systems.register' (string expected, got "..type(name)..")", 3)
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end
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if (not Type.isSystemClass(systemClass)) then
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error("bad argument #2 to 'Systems.register' (systemClass expected, got "..type(systemClass)..")", 3)
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end
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if (rawget(Systems, name)) then
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error("bad argument #2 to 'Systems.register' (System with name '"..name.."' is already registerd)", 3)
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end
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Systems[name] = systemClass
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end
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return setmetatable(Systems, {
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__index = function(_, name)
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error("Attempt to index system '"..tostring(name).."' that does not exist / was not registered", 2)
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end
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}) |