[antlr-interest] Checking whether an optional rule matched or not

[Kevin J. Cummings]

On 08/22/2009 01:46 AM, Mark Wright wrote:
> Hi Achint,
> 
> Maybe something like:
> 
> first
> @init { bool second_rule_matched = false; }
>   : (second)? { second_rule_matched = true; } third

    : (second { second_rule_matches = true; })? third
> {
>     if(second_rule_matched)
>       cout<<" Second rule matched"<<endl;
> }
> ;

Put the assignment action inside the optional subrule.

-- 
Kevin J. Cummings
kjchome at rcn.com
cummings at kjchome.homeip.net
cummings at kjc386.framingham.ma.us
Registered Linux User #1232 (http://counter.li.org)