Module:Protect/doc
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This is the documentation page for Module:Protect
 | This Lua module is used in system messages, and on approximately 224,000 pages. Changes to it can cause immediate changes to the Stiles.casa Wiki user interface. To avoid major disruption and server load, any changes should be tested in the module's /sandbox or /testcases subpages, or in your own Module:Protect. The tested changes can be added to this page in a single edit. Please discuss changes on the talk page before implementing them. |
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
errFormatwill be used as is, otherwise it will be wrapped inside a tag<strong class="error">.
- If true, then
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