Re: assert message linefeed
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- Subject: Re: assert message linefeed
- From: Edgar Toernig <froese@...>
- Date: 2001年4月14日 00:15:43 +0200
Hi,
John Belmonte wrote:
>
> I'd like to suggest that assert add a linefeed to the message string for us.
> In the case of disabled traceback, lack of a linefeed leaves a "hanging"
> command line. Try running this as a script:
>
> _ERRORMESSAGE = _ALERT
> assert(nil, "oh boy")
IMHO your assumption that _ALERT is a suitable _ERRORMESSAGE function is
wrong. All error msgs (including assert msgs) have no trailing '\n'.
Try issuing a normal error("foo") - it will be printed _wrong_, too.
The msgs passed to _ERRORMESSAGE are not lines but information strings.
And _ERRORMESSAGE's job is to build nice looking error messages from them.
By setting it to _ALERT your definition of _nice_ is: "just print it with-
out any reformatting" ;-)
If you want it nicer, i.e. make it a single line, use this:
function _ERRORMESSAGE(msg)
_ALERT(msg.."\n")
end
Or if you only want a special behavior for assert (i.e. no traceback)
redefine it:
function assert(cond, msg)
if not cond then
_ALERT("assertion failed! "..(msg or "").."\n")
error() -- will not call _ERRORMESSAGE
end
end
Ciao, ET.