Re: [Haskell-cafe] Re: Proving my point

On Fri, 16 May 2008, Achim Schneider wrote:

Philippa Cowderoy wrote:

...

On Fri, 16 May 2008, Achim Schneider wrote:

Guess who ran into that with a separate token for layout-inserted braces?

It can't be me, as I attempted to be as lazy as possible, not going for a tokenising pass, and ended up being too lazy.

Nah, you just picked the wrong way to attempt discipline. I don't use separate tokenising/lexing passes in a lot of my code (though you can't really avoid it when you want to do layout), it's a matter of knowing how it's done. Unless you've got a lexical structure that prevents it (which is to say, there're situations in which two tokens following each other aren't allowed to have whitespace between them), it's a good idea to have your token productions eat any whitespace following them, and then your toplevel becomes: do {whitespace; r <- realTopLevel; eof; return r} and then you need never worry about it again. -- flippa@flippac.org Ivanova is always right. I will listen to Ivanova. I will not ignore Ivanova's recomendations. Ivanova is God. And, if this ever happens again, Ivanova will personally rip your lungs out!