> > Alan Manuel Gloria:
> >> Handle multiline comments and other #-foolery.
> >>
> >> TODO: Need to add #{weird symbol}# syntax to Guile
> >> compatibility layer.
> >
> > Youch, that's a lot of complexity to implement what is notionally a simple
> > capability.
> >
> > I'm not sure I understand why this is so complicated. Can you help me
> > understand why it's hard to localize the support for multiline functions?
Alan Manuel Gloria:
> Because of the limitations on the read interface (pass in just a port,
> get out just a datum). And the lack of unlimited readahead.
>
> In any case, in a monadic form the support for comment-tag gets hidden
> away in the plumbing, but as we are not using a monadic form (this
> being Scheme where monadic form is not idiomatic) then any changes in
> the plumbing become significant changes *everywhere*.
>
> For example, in the modern-expressions parser I sent on the list a
> long way back, I think the changes would have been *much* more
> localized into the parser backend.
>
> But since there is no parser backend in the basic implementation,
> there is nothing to locally change - every function handles the port
> directly, instead of indicating some transformation that will
> *eventually* handle the port.
>
> In short, not enough abstraction in the initial implementation ^^
>
> > Maybe we can change how we interpret something, so we can vastly simplify
> > the implementation. Before merging, I want to make sure we *have* to go
> > this way; this will have a continuing drag on any other implementation
> > work. It may be hamper acceptance, if the implementation has to be this
> > ugly; the code will certainly be part of a SRFI proposal.
> >
> > In short: Can we find another, simpler way to do this?
>
> Yeah, monads. Or macros.
Hmm. Well, we need the functionality, so it's in. Thanks for doing it, I
didn't realize that part would have as many far-reaching effects.
--- David A. Wheeler
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