Concord/concord/assemblages.lua

--- Assemblages
-- Container for registered Assemblages

local PATH = (...):gsub('%.[^%.]+$', '')

local Type = require(PATH..".type")

local Assemblages = {}

--- Registers an Assemblage.
-- @param name Name to register under
-- @param assemblage Assemblage to register
function Assemblages.register(name, assemblage)
    if (type(name) ~= "string") then
        error("bad argument #1 to 'Assemblages.register' (string expected, got "..type(name)..")", 3)
    end

    if (not Type.isAssemblage(assemblage)) then
        error("bad argument #2 to 'Assemblages.register' (assemblage expected, got "..type(assemblage)..")", 3)
    end

    if (rawget(Assemblages, name)) then
        error("bad argument #2 to 'Assemblages.register' (Assemblage with name '"..name.."' was already registerd)", 3)
    end

    Assemblages[name] = assemblage
    assemblage.__name = name
end

--- Returns true if the containter has the Assemblage with the name
-- @param name Name of the Assemblage to check
-- @return True if the containter has the Assemblage with the name, false otherwise
function Assemblages.has(name)
    return Assemblages[name] and true or false
end

--- Returns the Assemblage with the name
-- @param name Name of the Assemblage to get
-- @return Assemblage with the name
function Assemblages.get(name)
    return Assemblages[name]
end


return setmetatable(Assemblages, {
    __index = function(_, name)
        error("Attempt to index assemblage '"..tostring(name).."' that does not exist / was not registered", 2)
    end
})