[antlr-interest] Parsing a little at a time?

[Rick Mann]

I posted this question once already, but got no response. Let me try  
rewording it.

I'd like to parse input as I get it from the user, a line at a time.  
Is this possible? Can I pass a string to the parser, and then have it  
return without error, even if the input is incomplete? Then I'd pass  
another string to the same parser instance, etc. Eventually, I'd like  
the parser to return an indication that it completed some work  
(although, in my case, I don't really even need that).

I'm about to try the experiment, but I'd hoped to know ahead of time.  
Maybe the API docs say...

TIA,
Rick