Thanks for repeating your reply to the group.  I have two follow-up 
questions inline below:

On Sunday, September 24, 2017 at 5:19:44 PM UTC-7, Jeffrey Kegler wrote:
>
> In addition to AH, a few papers have described ways to reduce the number 
> of Earley items, but these focus on taking things as far as the recognizer 
> -- they produce the Earley tables and stop.  Often the question of the cost 
> of undoing the compression at evaluation time is not addressed, and the 
> cost of the more complex evaluation phase seems likely to eliminate any 
> speed-up in the recognizer.
>

I'd be interested in which papers you're referring to as having described 
ways to reduce the number of Earley items.  Would you list a few?
 

> I want to point out that in that same paper, Aycock and Horspool, as a 
> side issue, describe a way of handling nulled symbols and productions via 
> grammar rewrites.
>
 
To clarify, are you referring to "Practical Earley Parsing", section 8 
"Reconstructing Derivations" [1]?

[1]: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.12.4254 

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