【网络通信】动作与表情：社交广播的轻量协议

---动作表情：轻量的广播协议
function Emote.play(actor, emoteId)
    local player = class(actor)
    if not player then return false end
    -- 频控：10 秒内最多 3 次
    local n = Emote.countIn10s(actor)
    if n >= 3 then
        sendmsg(actor, 1, "动作太频繁了，休息一下")
        return false
    end
    -- 动作表校验：合法的表情 ID
    if not EMOTE_DEF[emoteId] then
        sendmsg(actor, 1, "未知的动作")
        return false
    end
    -- 视野内广播：2 字节的轻量包
    local pkt = Emote.pack(actor, emoteId)
    for _, watcher in pairs(View.of(actor)) do
        sendmsg(watcher, 1, pkt)
    end
    return true
end

---指向性表情：对特定目标的互动
function Emote.directed(actor, targetName, emoteId)
    local player = class(actor)
    if not player then return false end
    local target = getplayerbyname(targetName)
    if not target then return false end
    -- 距离校验：互动表情要求 3 格内
    if not Emote.inRange(actor, target, 3) then
        sendmsg(actor, 1, "距离太远，走近些再互动")
        return false
    end
    -- 双方与视野内的三方可同时看到
    sendmsg(target, 1, actor .. " 向这边做了「" ..
        EMOTE_DEF[emoteId].name .. "」")
    Emote.play(actor, emoteId)
    return true
end