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|
jin.ai = jin.ai or {}
--[[
https://github.com/kyleconroy/lua-state-machine
Copyright (c) 2012 Kyle Conroy
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
]]
local machine = {}
machine.__index = machine
local NONE = "none"
local ASYNC = "async"
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')
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
-- Export to Jin.
jin.ai.newStateMachine = machine.create
|
