Re: [Caml-list] start conditions in ocamllex

[Shawn Wagner <shawnw@speakeasy.org>]

On Wed, Feb 25, 2004 at 01:07:44PM -0500, Sean Proctor wrote:
> Hi,
> 
> Has anyone thought of implementing start conditions for ocamllex? I have some
> problems that require keeping some state. They would be very simply solved
> with start conditions. I don't know much about the internals of ocamllex, but
> if the implementor of it thinks this is a good idea, I would be interested in
> writing this.
> 
> I was thinking a good syntax would be something like:
> regexp where condition
> 
> ex:
> condition startcondition
> rule entrypoint =
>   parse 'a' { start startcondition; A_TOKEN }
>     | 'a' where startcondition { finish startcondition; B_TOKEN }
> 
> so a string of a's would give alternating A_TOKEN and B_TOKEN.

Can't you get the same effect with multiple entrypoints? Though this syntax
is probably cleaner.

-- 
Shawn Wagner
shawnw@speakeasy.org

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