Thank you all for your replies.
I was able to fix it and better understanding grammars :-)
Regards,
David Santiago
Patrick R. Michaud <pmich...@pobox.com> escreveu no dia quinta,
21/05/2020 à(s) 21:05:
>
> On Thu, May 21, 2020 at 08:40:08PM +0000, David Santiago wrote:
> > Can someone explain me why my grammar isn't working? Unfortunately i
> > can't figure it out :-(
> >
> > | headers
> > | | header
> > | | * MATCH "Proxy-Connection"
> > | | header-value
> > | | * MATCH "keep-alive\n"
> > | | crlf
> > | | * FAIL
> > | * FAIL
> > * FAIL
> > Nil
>
> Notice how <header-value> is capturing the newline in "keep-alive\n"? That
> means there's not a newline for the <.crlf> subrule that follows, and thus
> the match fails.
>
> Try changing "rule header-value" to be a "token" instead. That will prevent
> it from consuming any whitespace immediately following the <graph>+ sequence.
> When I tried your script with header-value defined as a token, it got a lot
> farther into the match:
>
> $ rakudo test.raku
> TOP
> | request-line
> | | method
> | | * MATCH "CONNECT"
> | | request-uri
> | | * MATCH "ssl.gstatic.com:443"
> | | http-version
> | | * MATCH "HTTP/1.1"
> | | crlf
> | | * MATCH "\n"
> | * MATCH "CONNECT ssl.gstatic.com:443 HTTP/1.1\n"
> | headers
> | | header
> | | * MATCH "Proxy-Connection"
> | | header-value
> | | * MATCH "keep-alive"
> | | crlf
> | | * MATCH "\n"
> | * MATCH "Proxy-Connection: keep-alive\n"
> * MATCH "CONNECT ssl.gstatic.com:443 HTTP/1.1\nProxy-Connection: keep-"
> Nil
>
>
> Personally, I would likely define <header-value> to be something more like
>
> token header-value { \N+ }
>
> which gets any sequence of non-newline characters, since some of the headers
> coming afterwards contain spaces and characters which aren't part of <graph>.
>
> Pm
