[Caml-list] start conditions in ocamllex

[Sean Proctor <sproctor@ccs.neu.edu>]

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.

Sean

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