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Date: -- (:)
From: Alex Baretta <alex@b...>
Subject: Re: [Caml-list] unix.chop_extension
skaller wrote:
> # Filename.chop_extension "x.y/z";;
> - : string = "x"


This is a terrible consequence of not having (* functional *) support 
for regexps in the language or standard library. The Filename library 
uses the very weak functions of the String library to find the rightmost 
dot in the filename (* or path *), which is obviously correct only under 
a very stringent precondition, which is not the most general possible 
precondition for this function.

The Str module has a very clever implementation, but it cannot be used 
systematically in Ocaml because it is not *functional*. I'm sure that if 
we had a functional version of Str, the author of the Filename module 
would rewrite it using regular expressions instead of the rindex function.

***

There's one extra thing I'd like to point out. We have the 
chop_extension function. Why in the world is there no find_extension 
function?

find_extension "foo.bar" --> "bar"

Alex

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