Hello,
Le samedi 26 juillet 2014, Richard Hipp a écrit :
>
> Historical note: I wrote Lemon back in the 80s (on a Sun3, IIRC)
You were a visionary, Lemon is probably the only viable option for a parser
generator in C/C++ at this moment.
because
> the $1,$2,$3 notation of Yacc wasn't working for me and also because Yacc
> wanted the parser to call the lexer, not the other way around, and because
> it was difficult to stop memory leaks in Yacc when there was a syntax
> error. There was a companion LL(1) parser generator called "Lime" which
> has been lost. Lemon was originally a bunch of separate source files,
> many of which were automatically generated. But at some point I
> concatenated them all together into the single "lemon.c" file. All that
> happened prior to the beginning of SQLite. Anyhow, the current lemon.c
> code is a mess, for which I apologize.
But it does mostly work, so I've
> never gotten around to rewriting it from scratch, which is what it
> desperately needs.
Lemon is a master piece, it deserves it.
I propose my help, I am interested in the domain, but I might not be
capable enough. However I would be highly motivated if I am guided by
someone like you.
>
> The %wildcard token matches any token that cannot be matched by another
> rule in the current context.
>
>
It is exactly what I needed, I tried it and it is wonderful. I try to parse
some plsql code, but I only need to be superficial, then everything between
begin / end will be eaten by the wildcar
> I had to add the %wildcard feature to the parser generator when we added
> virtual tables to SQLite back in 2006 - in order to support the full text
> search extension. The virtual table syntax allows one put any arbitrary
> sequence of tokens as the argument, as long as parentheses match up.
> Keywords, literals, operators - any tokens are allowed. And the most
> memory-efficient way to do that was to enhance the parser generate with
> some special features to support it. Hence: "%wildcard".
>
>
I am lucky ;-)
> The lack of documentation is probably just because we never got around to
> it
> > if yes, could it be added in the documentation?
> >
>
> Do you have a patch :-)
>
>
Your documentation is among the best, I can help also there I think, how do
you want the patch to be done, I just need a little bit of explanation to
start. (I am on MacOS X)
>
> >
> > ps: I am pretty impressed by lemon, I am really having fun.
> >
> > Best regards,
> > Sylvain
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> >
>
>
>
> --
> D. Richard Hipp
> d...@sqlite.org
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>
Best regards,
Sylvain
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