On Sat, Apr 05, 2008 at 07:59:36PM -0000, John M. Dlugosz wrote:
> I'm trying to fathom STD.pm.
>
> Maybe someone can help me trace through this one?
>
> How is
> $obj!privA = 1;
> parsed?
>
> Reading expect_term, it trys <noun>, then <variable> sees the
> "$" and commits to the decision, reads "obj" as a <desigilname>,
> then checks for a ".", but doesn't have similar logic for "!".
I'm not sure what you mean by "then checks for a '.'" -- I don't
the dot in the <variable> rule isn't the same as the method dot.
I think the way it parses is that we get $obj from the
<noun> => <variable> sequence at the beginning of <expect_term>,
and then !privA is parsed via the <post> => dotty:sym<!> sequence.
So the parse tree looks something like:
<expect_term> = {
<noun> = {
<variable> = {
<sigil> # "$"
<desigilname> # "obj"
}
}
<post> = [
[0] = {
<dotty> = {
<sym> # "!"
<methodop> = {
<name> # "privA"
}
}
}
]
}
Pm
