102 lines
2.9 KiB
Lua
102 lines
2.9 KiB
Lua
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-- classes/states :: a finite state machine for objects
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--[[
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Copyright © 2022 Kazhnuz
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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]]
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local StateMachine = Object:extend()
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function StateMachine.addState(self, name, state, isDefault)
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if (self.states == nil) then
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self.states = {}
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self.states.list = {}
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end
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self.states.list[name] = state
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if (isDefault == true) then
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self.states.default = name
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end
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end
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function StateMachine.addStates(self, statesPath, default)
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local states = require(statesPath)
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for i, stateName in ipairs(states) do
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local state = require(statesPath .. "." .. stateName)
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self:addState(stateName, state)
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end
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self.states.default = default
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end
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function StateMachine:initStates()
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if (self.states == nil) then
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self.states = {}
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self.states.list = {}
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end
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self.currentState = self.states.default or "none"
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end
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function StateMachine:updateState(dt)
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self:playStateFunc("update", dt)
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end
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function StateMachine:haveState(state)
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return (self.states.list[state] ~= nil)
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end
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function StateMachine:setState(state)
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if (not self:haveState(state)) then
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return self.currentState
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end
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self:playStateFunc("stop", state)
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local currentState = self.currentState
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self.currentState = state
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self:playStateFunc("start", currentState)
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return state
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end
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function StateMachine:getState()
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return self.states.list[self.currentState]
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end
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function StateMachine:getStateVar(varName, default)
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local state = self:getState()
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if (state == nil) then
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return nil
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end
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local var = state[varName]
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if (var == nil) then
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return default
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end
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return var
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end
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function StateMachine:playStateFunc(funcName, ...)
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local state = self:getState()
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if (state == nil) then
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return
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end
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local func = state[funcName]
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if (func ~= nil) then
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func(self, ...)
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end
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end
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return StateMachine
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