【Lua实战】状态机模式：NPC对话流程的状态管理

-- NPC对话状态机
local player = class(actor)
local DIALOG = {
    start = {text = "欢迎来到比奇城！", options = {shop = "商店", quest = "任务"}},
    shop = {text = "需要什么？", options = {buy = "购买", sell = "出售", back = "返回"}},
    quest = {text = "有一个任务等待接取。", options = {accept = "接受", back = "返回"}},
}
local curState = "start"
local function handleOption(player, option)
    local state = DIALOG[curState]
    if state.options[option] then
        curState = option
        sendmsg(player, 1, 0, DIALOG[option].text or "...")
    end
end

-- 状态校验与回退
local player = class(actor)
local stateHistory = {}
local function goTo(player, newState)
    if DIALOG[newState] == nil then
        sendmsg(player, 1, 0, "无效的对话状态。")
        return
    end
    stateHistory[#stateHistory + 1] = curState
    curState = newState
    if #stateHistory > 20 then table.remove(stateHistory, 1) end
end
local function goBack(player)
    if #stateHistory > 0 then
        curState = table.remove(stateHistory)
    end
end