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local machine = {}
machine.__index = machine
local NONE = "none"
local ASYNC = "async"
-- Compatibility for Lua 5.1 vs 5.2+
local unpack = unpack or table.unpack
local function call_handler(handler, params)
if handler then
return handler(unpack(params))
end
end
local function create_transition(name)
local can, to, from, params
local function transition(self, ...)
if self.asyncState == NONE then
can, to = self:can(name)
from = self.current
params = { self, name, from, to, ...}
if not can then return false end
self.currentTransitioningEvent = name
local beforeReturn = call_handler(self["onbefore" .. name], params)
local leaveReturn = call_handler(self["onleave" .. from], params)
if beforeReturn == false or leaveReturn == false then
return false
end
self.asyncState = name .. "WaitingOnLeave"
if leaveReturn ~= ASYNC then
transition(self, ...)
end
return true
elseif self.asyncState == name .. "WaitingOnLeave" then
self.current = to
local enterReturn = call_handler(self["onenter" .. to] or self["on" .. to], params)
self.asyncState = name .. "WaitingOnEnter"
if enterReturn ~= ASYNC then
transition(self, ...)
end
return true
elseif self.asyncState == name .. "WaitingOnEnter" then
call_handler(self["onafter" .. name] or self["on" .. name], params)
call_handler(self["onstatechange"], params)
self.asyncState = NONE
self.currentTransitioningEvent = nil
return true
else
if string.find(self.asyncState, "WaitingOnLeave") or string.find(self.asyncState, "WaitingOnEnter") then
self.asyncState = NONE
transition(self, ...)
return true
end
end
self.currentTransitioningEvent = nil
return false
end
return transition
end
local function add_to_map(map, event)
if type(event.from) == 'string' then
map[event.from] = event.to
else
for _, from in ipairs(event.from) do
map[from] = event.to
end
end
end
function machine.create(options)
assert(options.events)
local fsm = {}
setmetatable(fsm, machine)
fsm.options = options
fsm.current = options.initial or 'none'
fsm.asyncState = NONE
fsm.events = {}
for _, event in ipairs(options.events or {}) do
local name = event.name
fsm[name] = fsm[name] or create_transition(name)
fsm.events[name] = fsm.events[name] or { map = {} }
add_to_map(fsm.events[name].map, event)
end
for name, callback in pairs(options.callbacks or {}) do
fsm[name] = callback
end
return fsm
end
function machine:is(state)
return self.current == state
end
function machine:can(e)
local event = self.events[e]
local to = event and event.map[self.current] or event.map['*']
return to ~= nil, to
end
function machine:cannot(e)
return not self:can(e)
end
function machine:todot(filename)
local dotfile = io.open(filename,'w')
assert(dotfile~=nil)
dotfile:write('digraph {\n')
local transition = function(event,from,to)
dotfile:write(string.format('%s -> %s [label=%s];\n',from,to,event))
end
for _, event in pairs(self.options.events) do
if type(event.from) == 'table' then
for _, from in ipairs(event.from) do
transition(event.name,from,event.to)
end
else
transition(event.name,event.from,event.to)
end
end
dotfile:write('}\n')
dotfile:close()
end
function machine:transition(event)
if self.currentTransitioningEvent == event then
return self[self.currentTransitioningEvent](self)
end
end
function machine:cancelTransition(event)
if self.currentTransitioningEvent == event then
self.asyncState = NONE
self.currentTransitioningEvent = nil
end
end
machine.NONE = NONE
machine.ASYNC = ASYNC
return machine