102 lines
No EOL
2.9 KiB
Lua
102 lines
No EOL
2.9 KiB
Lua
-- classes/states :: a finite state machine for objects
|
|
|
|
--[[
|
|
Copyright © 2022 Kazhnuz
|
|
|
|
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 StateMachine = Object:extend()
|
|
|
|
function StateMachine.addState(self, name, state, isDefault)
|
|
if (self.states == nil) then
|
|
self.states = {}
|
|
self.states.list = {}
|
|
end
|
|
|
|
self.states.list[name] = state
|
|
|
|
if (isDefault == true) then
|
|
self.states.default = name
|
|
end
|
|
end
|
|
|
|
function StateMachine.addStates(self, statesPath, default)
|
|
local states = require(statesPath)
|
|
for i, stateName in ipairs(states) do
|
|
local state = require(statesPath .. "." .. stateName)
|
|
self:addState(stateName, state)
|
|
end
|
|
self.states.default = default
|
|
end
|
|
|
|
function StateMachine:initStates()
|
|
if (self.states == nil) then
|
|
self.states = {}
|
|
self.states.list = {}
|
|
end
|
|
self.currentState = self.states.default or "none"
|
|
end
|
|
|
|
function StateMachine:updateState(dt)
|
|
self:playStateFunc("update", dt)
|
|
end
|
|
|
|
function StateMachine:haveState(state)
|
|
return (self.states.list[state] ~= nil)
|
|
end
|
|
|
|
function StateMachine:setState(state)
|
|
if (not self:haveState(state)) then
|
|
return self.currentState
|
|
end
|
|
self:playStateFunc("stop", state)
|
|
local currentState = self.currentState
|
|
self.currentState = state
|
|
self:playStateFunc("start", currentState)
|
|
return state
|
|
end
|
|
|
|
function StateMachine:getState()
|
|
return self.states.list[self.currentState]
|
|
end
|
|
|
|
function StateMachine:getStateVar(varName, default)
|
|
local state = self:getState()
|
|
if (state == nil) then
|
|
return nil
|
|
end
|
|
local var = state[varName]
|
|
if (var == nil) then
|
|
return default
|
|
end
|
|
return var
|
|
end
|
|
|
|
function StateMachine:playStateFunc(funcName, ...)
|
|
local state = self:getState()
|
|
if (state == nil) then
|
|
return
|
|
end
|
|
local func = state[funcName]
|
|
if (func ~= nil) then
|
|
func(self, ...)
|
|
end
|
|
end
|
|
|
|
return StateMachine |