Module:Protect/doc

这是Module:Protect的文档页面

這個模板被使用在系統訊息中。
對此模板的修改會立即反映在維基百科用戶介面上，為避免造成大規模的影響，任何編輯應該先在此模板的沙盒頁面、測試樣例或您自己的用戶子頁面中測試，測試過後的修改才能在單次編輯中添加到此模板。請在做任何修改之前在此討論頁中進行討論。

This metamodule simplifies error handling in other modules. It transforms a function, which may throw an error, into a function, which returns a specified error message in that case.

Usage

 local protect = require('Module:Protect')
 local protectedFunc = protect(func, errFormat, options)

Arguments

func
Function to be transformed.
errFormat (default: 'Error: %s')
Custom error message.

Use '%s' to include the message from a caught error.
options – optional table with the following fields:
- raw (default: false)
  If true, then errFormat will be used as is, otherwise it will be wrapped inside a tag <strong class="error">.
- removeLocation (default: true)
  If true, removes location information from caught error messages.

Return value

The resulting protectedFunc is a function, which calls the original function func, passing all arguments to it, and returns all its return values. If func throws an error, the specified error message is returned instead.

Example

local protect = require('Module:Protect')

local p = {}

function p.main(frame)
    if not frame.args[1] then
        error('missing argument')
    end
    return frame.args[1]
end

p.main = protect(p.main)

return p

Invoking the main function without arguments will output: Error: missing argument