【工具链】表差异对比：热更前后的配置差异报告

-- 表差异对比：三态计算
local player = class(actor)
local function diffTables(old, new, path)
    path = path or "root"
    local report = {}
    for k, v in pairs(new) do
        local keyPath = path .. "." .. tostring(k)
        if old[k] == nil then
            report[#report + 1] = "ADD " .. keyPath .. " = " .. tostring(v)
        elseif type(v) == "table" and type(old[k]) == "table" then
            local sub = diffTables(old[k], v, keyPath)
            for _, line in ipairs(sub) do report[#report + 1] = line end
        elseif old[k] ~= v then
            report[#report + 1] = "MOD " .. keyPath .. " : " ..
                tostring(old[k]) .. " -> " .. tostring(v)
        end
    end
    for k in pairs(old) do
        if new[k] == nil then
            report[#report + 1] = "DEL " .. path .. "." .. tostring(k)
        end
    end
    return report
end

-- 差异归档：审批留痕
local player = class(actor)
local function archiveDiff(player, trainId, report)
    setsysvarex("DiffLog_" .. trainId, table.concat(report, "\n"), true)
    setsysvarex("DiffOwner_" .. trainId, getbaseinfo(player, 3), true)
    if #report > 50 then
        sendmsg(player, 1, 0, "差异 " .. #report .. " 条超过阈值，需总监复核。")
        return false
    end
    sendmsg(player, 1, 0, "差异 " .. #report .. " 条已归档，允许热更。")
    return true
end