Am Donnerstag, 26. November 2015 23:53:26 UTC+1 schrieb Jeffrey Kegler:
>
> The LHS is available to an action via context variables
> <http://search.cpan.org/~jkegl/Marpa-R2-3.000000/pod/Semantics.pod#Action_context>.
>
> So you could write your own dispatcher and either make it the default
> action or apply it selectively.
>
Thanks. This action helps me getting warm with Marpa actions:
sub lhs {
my ($lhs) = map {
$Marpa::R2::Context::slg->symbol_display_form($_)
} $Marpa::R2::Context::slg->rule_expand($Marpa::R2::Context::rule);
return $lhs;
}
sub dump_and_exit
{
my ($self, @args) = @_;
print lhs, "\n", Dumper (@args);
exit;
}
I use it gradually from the top to the bottom of the grammar. After
reaching the bottom I can go back to the top by replacing each
dump_and_exit by some useful code. Together with the default action
[name,values] I think I can finish my task pretty fast.
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