Re: Parse::RecDescent grammar that winds its way all the way back to start

[gnosti]

in reply to Parse::RecDescent grammar that winds its way all the way back to start

You might design your parser to consume only one entry at a time. Pass your data to the parser as scalar reference. This way the scalar will be left with the remaining (unconsumed) text.

$parser->start_rule(\$data) or warn("not a job file"), return;
while( $data ){ $parser->job_statement(\$data) }

Since you're calling the parser anew each time, you won't have a problem with unwinding entries.

This doesn't address the question of how to resync if you encounter a bad entry.

[sundialsvc4]

That is a very clever strategy.   I will ponder it carefully.

In this case, “resyncing after a syntax error” is a non-issue.   I am interested in the error messages because I am debugging the grammar.

Thanks for all your help, everyone.