Am Donnerstag, 19. November 2015 20:25:19 UTC+1 schrieb rns: > > [a-zA-Z0-9_]+ is a quantified rule RHS and it just needs its own LHS as > you did above with identifier_extend, otherwise it is a SLIF DSL syntax > error. > > Note that RHS primary can't be a quantified character class -- there are > quantified rules for that -- > https://metacpan.org/pod/distribution/Marpa-R2/pod/Scanless/DSL.pod#Quantified-rule > > <https://www.google.com/url?q=https%3A%2F%2Fmetacpan.org%2Fpod%2Fdistribution%2FMarpa-R2%2Fpod%2FScanless%2FDSL.pod%23Quantified-rule&sa=D&sntz=1&usg=AFQjCNE2elwoh6QgqnUMdydmPV0KdA17ig> >
I already have learned this limitation. On Thu, Nov 19, 2015 at 11:07 AM, <[email protected] <javascript:>> wrote: > >> The following grammar part works fine: >> >> limited_identifier ~ [a-zA-Z_] identifier_extend >> identifier_extend ~ [a-zA-Z0-9_]+ >> >> >> But this one throws the error: >> >> limited_identifier ~ [a-zA-Z_] [a-zA-Z0-9_]+ >> >> >> For me there is no difference. But there seems to be a difference for >> Marpa. >> >> What is the difference? >> > The question is why does this limitation exist, because it looks a bit odd. As far as I know lexing is normally done by regular expressions. And regular expression typically do not have such a limitation. So where does it come from? -- You received this message because you are subscribed to the Google Groups "marpa parser" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
