|Efficient construction of LALR Parsing Tables firstname.lastname@example.org (Yasmina) (2006-08-14)|
|Re: Efficient construction of LALR Parsing Tables email@example.com (Ivan Boldyrev) (2006-08-15)|
|Re: Efficient construction of LALR Parsing Tables firstname.lastname@example.org (Yasmina) (2006-08-19)|
|From:||Ivan Boldyrev <email@example.com>|
|Date:||15 Aug 2006 18:54:39 -0400|
|Organization:||this field is intentionally left blank|
|Posted-Date:||15 Aug 2006 18:54:39 EDT|
On 9567 day of my life firstname.lastname@example.org wrote:
> " Reduction by A -> e is called for on input a if and only if there is
> a kernel item [B -> g · Cd, b] such that C => An for some n, and a is
> in FIRST(ndb). The set of nonterminals A such that C => An can be
> precomputed for each nonterminal C."
> "We shift on input a if there is a kernel item [B -> g · Cd, b] where
> C => ax in a derivation in which the last step does not use an
> e-production. The set of such a's can also be precomputed for each C"
> I don't know how to precompute the set of nonterminals A and the set of
> terminals a. I think that the only way to precompute this sets is
> derive the grammar, but this isn't efficient.
Hint: the calculation is similar to calculation of FIRST and FOLLOW sets.
.signature is under construction.
Return to the
Search the comp.compilers archives again.