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luafsm.lua
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luafsm.lua
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-- create a table for the module
local luafsm = {}
-- define the create function
function luafsm.create(state)
-- basic state
if type(state) == "function" then
return state
-- super state
elseif type(state) == "table" then
local entry = state.entry
local exit = state.exit
local current = nil
local substates = {}
-- recursively construct substates
for identifer, substate in pairs(state.substates) do
substates[identifer] = luafsm.create(substate)
end
-- generate and return a super state function
return function()
if current == nil then
if type(entry) == "function" then
current = entry()
else
current = entry
end
end
-- execute the current substate
done, next = substates[current]()
if done then
-- done is true, the current substate has finished executing
if next then
current = next
return false
else
-- no next state
-- reset the current state to nil
current = nil
if exit then
-- exit was defined
if type(exit) == "table" then
return unpack(exit)
elseif type(exit) == "function" then
return exit()
else
return exit
end
else
-- exit was not defined
return true
end
end
else
-- done is false, the current substate is still executing
return false
end
end
end
end
-- return the module
return luafsm;