【高级技巧】调试技巧：变量监视与条件断点模拟

local function watchVar(fn, targetName, cond)
    return function(...)
        local hookHit = false
        local function hook(event, line)
            if hookHit then
                return
            end
            local i = 1
            while true do
                local name, value = debug.getlocal(3, i)
                if name == nil then
                    break
                end
                if name == targetName and cond(value) then
                    hookHit = true
                    debug.sethook()
                    print("命中 " .. targetName .. "=" .. tostring(value))
                    return
                end
                i = i + 1
            end
        end
        debug.sethook(hook, "l")
        local a, b, c = fn(...)
        debug.sethook()
        return a, b, c
    end
end
local function calcRed(atk, base)
    local red = atk - base
    return red
end
local watched = watchVar(calcRed, "red", function(v)
    return v < 0
end
)
watched(1500, 2000)

local hits = 0
local function onLine()
    hits = hits + 1
end