├── README.md
└── statemachine
    ├── demo.lua
    └── statemachine.lua


/README.md:
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 1 | lua-state-machine
 2 | =================
 3 | 
 4 | lua state machine taking advantage of first class functions.
 5 | 
 6 | example
 7 | =================
 8 | dofile("statemachine.lua")
 9 | 
10 | sm = stateManager:new(true)
11 | 
12 | firstState = state:new("first state", {function () print("first") sm.nextState() end})
13 | 
14 | secondState = state:new("first state", {function () print("second") sm.stop() end})
15 | 
16 | sm.add(firstState)
17 | 
18 | sm.add(secondState)
19 | 
20 | sm.run()
21 | =================
22 | 


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/statemachine/demo.lua:
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1 | dofile("statemachine.lua")
2 | 
3 | sm = stateManager:new(true)
4 | firstState = state:new("first state", {function () print("demo") end})
5 | 


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/statemachine/statemachine.lua:
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 1 | local state = {}
 2 | local state_mt = {__index = state}
 3 | 
 4 | function state:new(new_id, new_wrap)
 5 |   local new_inst = {id = new_id, wrap = {func = new_wrap[1]}, orig}
 6 |   self.orig = self.wrap
 7 |   setmetatable(new_inst, state_mt)
 8 |   return new_inst
 9 | end
10 | 
11 | function state:getName()
12 |   return self.id
13 | end
14 | 
15 | function state:update()
16 |   self.wrap.func()
17 | end
18 | 
19 | local stateManager = {}
20 | local stateManager_mt = {__index = stateManager}
21 | function stateManager:new(isDebugMode)
22 |   local new_inst = {running = true, selected = 1, list = {}, previousState = 1, debugMode = isDebugMode}
23 |   setmetatable(new_inst, stateManager_mt)
24 |   return new_inst
25 | end
26 | 
27 | function stateManager:debugModeOn(isDebugMode)
28 |   self.debugMode = isDebugMode
29 |   if self.debugMode == true then
30 |     print("# of states "  .. #self.list)
31 |   end
32 | end
33 | function stateManager:rollback()
34 |   temp = self.selected
35 |   self.selected = self.previousState
36 |   self.previousState = temp
37 |   if self.debugMode == true then print("rolled back to " .. self.list[self.selected]:getName() .. " state...") end
38 | end
39 | function stateManager:add(new_state)
40 |   table.insert(self.list, new_state)
41 | end
42 | 
43 | function stateManager:nextState()
44 |   self.previousState = self.selected
45 |   if #self.list > self.selected then
46 |     self.selected = self.selected + 1
47 |   else
48 |     self.selected = 1
49 |   end
50 |   if self.debugMode == true then print("changed to " .. self.list[self.selected]:getName() .. " state...") end
51 | end
52 | 
53 | function stateManager:changeStateTo(new_selected)
54 |   self.previousState = self.selected
55 |   if type(new_selected) == "number" then
56 |     if new_selected > #self.list or new_selected < 1 then
57 |       if self.debugMode then print("invalid state number...") end
58 |     else
59 |       self.selected = new_selected
60 |       if self.debugMode == true then print("changed to " .. self.list[self.selected]:getName() .. " state...") end
61 |     end
62 |   elseif type(new_selected) == "string" then
63 |     for i = 1, #self.list do
64 |       if self.list[i]:getName() == new_selected then
65 |             self.selected = i
66 |         if self.debugMode == true then print("changed to " .. self.list[self.selected]:getName() .. " state...") end
67 |             break
68 |       else
69 |             if i == #self.list then
70 |               if self.debugMode == true then print("can't find state id...") end
71 |             end
72 |       end
73 |     end
74 |   else
75 |     if self.debugMode == true then print("unknown type...") end
76 |   end
77 | end
78 | 
79 | function stateManager:run()
80 |   self:changeStateTo(1)
81 |   if #self.list >= 1 then
82 |     while self.running do
83 |       self.list[self.selected]:update()
84 |     end
85 |   else
86 |     if self.debugMode == true then print("state list empty...") end
87 |   end
88 | end
89 | function stateManager:stop()
90 |   self.running = false
91 |   if self.debugMode == true then print("state machine has stopped running") end
92 | end
93 | 


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