Re: PEG Patches

[Noah Lavine]

Here's another patch, which in retrospect may be the most useful of
the series. It adds a section called "PEG Internals" to the manual,
and begins documenting how PEG actually works. This should make
hacking PEG a lot easier.

Noah

On Sun, Mar 6, 2011 at 12:25 AM, Noah Lavine <address@hidden> wrote:
> Hello all,
>
> Attached is a series of patches I've made for the wip-mlucy branch. It
> splits the PEG code into several little modules which go in
> module/ice-9/peg/. The original peg source file becomes very little.
> At the end it finally loses its big eval-when wrapper.
>
> There's one part of this that I'm not satisfied with, which is that
> define-nonterminal goes into module/ice-9/peg/string-peg.scm, which is
> supposed to be solely for pegs-as-strings. The reason for this is that
> I got compiler errors if I didn't do this, and I couldn't figure out
> how to stop them. I would appreciate it if someone would take a look
> and try to find what I missed.
>
> Also, a note about future ideas - the current PEG code can only parse
> strings. However, there is almost nothing string-specific about the
> parsing code - just a few calls to string-ref and substring in
> codegen.scm. I'd like to see this extended to parse vectors filled
> with arbitrary objects. This would let you use a tokenizer with it,
> which is the easiest way to implement C correctly, and also probably
> the easiest way to store line number information with tokens, which is
> necessary for ultimately giving good error messages from PEG parsers.
>
> Thanks,
> Noah
>

0001-Document-PEG-Internals.patch
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