[m-rev.] diff/for review: more library improvements for caribou

[Zoltan Somogyi]

On 06-Jan-2005, Michael Day <mikeday at yeslogic.com> wrote:
> Will this scanner generator be included in the extras distribution?

Yes, when it is finished.

> If so, how does it differ from lex?

In two kinds of ways. One kind is the kind forced by the pure nature of
Mercury. For example, if an action in lex wants to access global state,
it can just do so, in caribou (my lex lookalike) you have to pass a state
variable argument pair for each such piece of global state. The second
kind is syntactic. For example, Mercury uses % for comments. Using %%
to separate sections of a specification wouldn't work, so caribou uses
##declarations, ##rules and ##includes instead.

However, in spirit and in most details caribou is very much like lex.

Zoltan.
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