[antlr-interest] Expr example in Wiki compile error Eclipseusing ANTLRworks

[Terence Parr]

On Dec 16, 2006, at 4:35 PM, Foolish Ewe wrote:

> Hello All:
>
> Thanks Ter, my initial thought was I had made some sort of error,  
> but was just too dense to see it.
> Given the amount of improved functionality the ANTLR folks are  
> introducing in ANTLR3
> and ANTLRworks, I am actually pleased with how robust the  
> environment is and how fast
> fixes are applied in when something is discovered.

Thanks!  we are getting closer and closer to a final release, but I'm  
fixing bugs only when they interfere with what I am typing in the  
book. ;) My deadline is essentially end of January for the book in  
order to get it published and in stores by May. then I will devote  
full time to getting a full 3.0 release out.

> I have an additional question about the example grammar, the lexer  
> and perhaps Eclipse itself.
> The example, Expr appears to hang when I run it in Eclipse, and  
> I've added debugging
> output and actions to all  non terminals (Please see attached  
> source for details).
> In the trace for Expr in the wiki, it appears to read until it  
> reaches EOF, I've tried entering
> ^D (control D) into the Eclipse console window but that doesn't  
> seem to trigger the EOF
> condition, nor do I see any of the expected output.  Running it in  
> the debugger seems to indicate
> that the ANTLRInputStream constructor does not terminate.  Why is  
> that?
>
> My questions are:
> 1) Have I somehow screwed things up that the symptoms I'm seeing  
> are my own fault?

I think eclipse probably does not know how to say EOF.  Convert to  
use ANTLRFileStream and pass it a file name with that input.

> 2) In Eclipse, is it possible to pass an EOF to System.in? (not an  
> Antlr question, but maybe I'll
>    get lucky).

Some  eclipse guy can tell, but I cannot ;)

> 3) If I want to limit buffering to one line of input at a time, is  
> there some other input class
>    I should be using in ANTLR.

Right now, ANTLR sucks everything in by default. I believe people are  
working on some on-demand stuff.

Ter