you're probably right, this could be regarded as dead code for ghc 7.8 (esp
since alex and happy must be the recent versions to even build ghc HEAD ! )
On Tue, Jan 7, 2014 at 2:25 AM, Mateusz Kowalczyk
Greetings,
When looking at the GHC lexer (Lexer.x), there's:
$unispace = \x05 -- Trick Alex into handling Unicode. See alexGetChar. $whitechar = [\ \n\r\f\v $unispace] $white_no_nl = $whitechar # \n $tab = \t
Scrolling down to alexGetChar and alexGetChar', we see the comments:
-- backwards compatibility for Alex 2.x alexGetChar :: AlexInput -> Maybe (Char,AlexInput)
-- This version does not squash unicode characters, it is used when -- lexing strings. alexGetChar' :: AlexInput -> Maybe (Char,AlexInput)
What's the reason for these? I was under the impression that since 3.0, Alex has natively supported unicode. Is it just dead code? Could all the hex $uni* functions be removed? If not, why not?
-- Mateusz K. _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs