[antlr-interest] Faster expression parsing

[Terence Parr]

On Aug 29, 2008, at 12:40 PM, James Mansion wrote:

> Terence Parr wrote:
>> This one is much more efficient but I am not sure it will show up   
>> unless you have a huge input.
>>
> Isn't the optimisation of:
>
>   <some-elided-constructs> foo <some-more-elided-constructs> -> foo
>
> to
>
>   foo
>
> something that antlr could do fairly easily?

nope... how can I be sure you do not want those elided constructs?

foo -> foo

I suppose I could get rid of, but two compilers really get rid of a=a;?

Ter