On 31-Dec-06, at 9:56 PM, askok@dnainternet.net wrote:
A perl-ish way of making error checking, but neat and effective:
_= nsfm:fileExistsAtPath(testfile)
or error "File doesn't exist!"
_= nsfm:copyPath( testfile, newfile )
or error "File copy failed!"
Currently, Lua does not allow leaving the "_=" away, since that
would make these commands and commands don't have a value ('or'
gives this a value).
In my opinion, evaluation results could be allowed even if the
value is not stored anyway. In a way, they would have a "drain"
that eats up the value.
I do know that by a function this can be overcome, but the neaty
is to have the essential thing first (the command), and ability to
switch on/off the error check by simply commenting that out.
Anyways, this is caused by my exposure to perl lately, it does
show. Perl has a lot of those thisandthat or die things.. Which I
actually like(d).
But what's wrong with:
assert(nsfm:fileExistsAtPath(testfile), "File doesn't exist!")
Or even, if fileExistsAtPath follows normal Lua conventions of
returning <nil/false, error message>,
assert(nsfm:fileExistsAtPath(testfile))
?
Another (perhaps warped) possibility is:
repeat until nsfm:fileExistsAtPath(testfile)
or Shriek "File doesn't exist"