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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
edit local protect = require('Module:Protect')
local protectedFunc = protect(func, errFormat, options)
Arguments
editfunc
- 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">
.
- If true, then
removeLocation
(default: true)- If true, removes location information from caught error messages.
Return value
editThe 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
editlocal 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