Buglet in AdobeLibrary1.jsx

Question

I thought I'd point out a technical bug in one of the functions in AdobeLibrary1.jsx. The function file.getExtension() can return wrong results when the filename has no extension because (on Windows, at least) parts of the pathname can have "." in them. This isn't real common, but is possible. So if you pass the filename "c:/bob/ted.alice/jack" to your function, it will return ".alice/jack" as the extension which is not technically correct. In reality, it should return "" since there is no extension.
In my own code, I've used a regular expression /\.[^\/\\]*$/ which is a period, followed by some number of non-path separator characters at the end of the string and this handles both cases.
--John

Answer 1

[email protected] wrote:
> I think you need to use brackets with the exec method of the re eg
>
> var re = /\.([^\.\/\\]+$)/;
> var reResultsAr = re.exec(targetstring);
> var firstBracket = reResultsAr[1];
>
> I better admit that I have not tested this, I'm just going from the Core Javascript Ref 1.5.
>
> Andrew
I knew about doing this, but he wanted a one liner, i.e. one that just used
regexp to return a result. It's not possible with JavaScripts regexp implementation.
Also, you don't need to use RegExp.exec: String.match will give you the same
behaviour.
And, if you really want to get it all on one line, do it like this:
((RegExp.__tmp = str.match(/\.([^\.\/\\]+$)/)) ? RegExp.__tmp[1] : undefined)
While something like this is (almost) obvious to me, I can't say that most PS
scripters would understand it at first glance.
ciao,
-X