error-handling - 您如何抛出Lua错误？

Question

是否可以从调用该函数的脚本处理的函数中引发Lua错误？

例如，以下内容将在指定的注释处引发错误

local function aSimpleFunction(...)
    string.format(...) -- Error is indicated to be here
end

aSimpleFunction("An example function: %i",nil)

但是我更愿意做的是捕获错误并由函数调用者抛出一个自定义错误

local function aSimpleFunction(...)
    if pcall(function(...)
        string.format(...)
    end) == false then
       -- I want to throw a custom error to whatever is making the call to this function
    end

end

aSimpleFunction("An example function: %i",nil) -- Want the error to start unwinding here 

目的是在我的实际用例中，我的功能会更复杂，并且我想提供更有意义的错误消息

Answer 1

抛出新错误时可以指定错误的堆栈级别

error("Error Message") -- Throws at the current stack
error("Error Message",2) -- Throws to the caller
error("Error Message",3) -- Throws to the caller after that

Usually, error adds some information about the error position at the beginning of the message. The level argument specifies how to get the error position. With level 1 (the default), the error position is where the error function was called. Level 2 points the error to where the function that called error was called; and so on. Passing a level 0 avoids the addition of error position information to the message.

使用问题中给出的示例

local function aSimpleFunction(...)
    if pcall(function(...)
        string.format(...)
    end) == false then
       error("Function cannot format text",2)
    end

end

aSimpleFunction("An example function: %i",nil) --Error appears here