Re: GSOC PEG project

[Ludovic Courtès]

Hello,

No Itisnt <address@hidden> writes:

> On Mon, Jul 5, 2010 at 6:59 PM, Michael Lucy <address@hidden> wrote:
>> On Mon, Jul 5, 2010 at 5:40 PM, Ludovic Courtès <address@hidden> wrote:
>>> Michael Lucy <address@hidden> writes:
>>>
>>>> Files I've added so far:
>>>> guile/modules/ice-9/peg.scm (I assume this is the right place to put this?)
>>>
>>> No, it should rather go under ‘module/language/peg.scm’, for the sake of
>>> consistency with other compiler front-ends.  But see below.
>>
>> I'm not quite sure how this qualifies as a compiler front-end.  The
>> functionality is mostly done (if unoptimized), so it shouldn't be too
>> hard to turn it into one if that's what you want, but the original
>> thought was just to build a compiling parser.  E.g.:
>>
>> (use-modules (ice-9 peg))
>> (peg-find "'b'+" "aabbcc")
>> --> (2 4 "bb")

[...]

>>>> PEG compiler: Works for all the grammars I've tested, no known bugs.
>>>> Currently compiles to Scheme code rather than Tree-IL for debugging.
>>>
>>> It should rather compiler to tree-IL, like other front-ends, which is
>>> very close to Scheme anyway.
>
> I think you are both misunderstanding eachother:
>
> - The PEG functions, useful in their own right, would be exposed as (ice-9 
> peg).
> - There is an additional syntax for expressing grammars, so it can be
> better used as a parser generator. That would go in as (language peg).

OK, I understand now.  Sorry for the confusion!

Ludo’.