On Fri, Oct 31, 2008 at 08:47:09PM -0700, Chris Dolan via RT wrote:
> It seems to be Regex.pir that is taking all of the invocations. I have
> discovered that, beyond <text>, I cannot create tokens/rules named
> "null", "ws", etc. The latter is particularly problematic in writing
> parsers in Perl6. The following simple example shows the failure:
>
> grammar WSOverride {
> token TOP { <tok_foo> <.ws> <tok_bar> };
> token tok_foo { foo };
> token tok_bar { bar };
> token ws { [ \h | \v | '%' ]+ };
> }
>
> ok('foo bar' ~~ WSOverride::TOP); # succeeds
> ok("foo\nbar" ~~ WSOverride::TOP); # succeeds
> ok("foo%%%\nbar" ~~ WSOverride::TOP); # fails
First, note that C< 'foo bar' ~~ WSOverride::TOP > isn't
really the correct syntax for invoking a rule -- but the
synopses don't really specify what the correct syntax is yet.
At the moment we do know that it's not likely to be
C< 'foo' ~~ Grammar::rule >.
Beyond that, the problem appears to be that Rakudo is not
presently creating its grammars properly -- it appears to
be deriving them directly from Any instead of from a PGE
grammar class of some sort. As a result, inheritance and
method dispatch don't seem to be working quite properly,
and we'll need to get that fixed.
Pm
