generated from sage/tiny-ecs-love-template
37 lines
1.2 KiB
Lua
37 lines
1.2 KiB
Lua
---@generic T
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---@param shape T | fun()
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---@param process fun(entity: T, dt: number, system: System) | nil
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---@param compare nil | fun(system: System, entityA: T, entityB: T): boolean
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---@return System | { entities: T[] }
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function filteredSystem(name, shape, process, compare)
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assert(type(name) == "string")
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assert(type(shape) == "table" or type(shape) == "function")
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assert(process == nil or type(process) == "function")
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local system = compare and tiny.sortedProcessingSystem() or tiny.processingSystem()
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system.compare = compare
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system.name = name
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if type(shape) == "table" then
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local keys = {}
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for key, value in pairs(shape) do
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local isTable = type(value) == "table"
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local isMaybe = isTable and value.maybe ~= nil
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if not isMaybe then
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-- ^ Don't require any Maybe types
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keys[#keys + 1] = key
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end
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end
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system.filter = tiny.requireAll(unpack(keys))
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elseif type(shape) == "function" then
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system.filter = shape
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end
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if not process then
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return World:addSystem(system)
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end
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function system:process(e, dt)
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process(e, dt, self)
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end
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return World:addSystem(system)
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end
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