[news.eclipse.modeling.tmf] Re: Lookahead value of xtext grammar

[knut.wannheden@xxxxxxxxxx (Knut Wannheden)]

Hi Erol,

If you use the ANTLR parser with Xtext you get an ANTLR v3 parser which 
uses an LL(*) parsing algorithm -- i.e. arbitrary lookahead -- so you 
shouldn't have to restrict the lookahead. But if you want you can do this 
by specifying a nested <options> element to the 
XtextAntlrGeneratorFragment in your MWE workflow (in this example I've 
also enabled backtracking with memoization):

           <fragment 
class="de.itemis.xtext.antlr.XtextAntlrGeneratorFragment">
                   <options k="4" backtrack="true" memoize="true"/>
           </fragment>

Hope that helps,

--knut

Erol Akarsu wrote:

> I am stress testing tmf xtext with a little large grammar.
> I have to parse it with lookahead value 4 bceause lookahead =1 is not 
> enough for the nature of grammar.

> How can I specify the lookahead value?

> Regards

> Erol Akarsu