[antlr-interest] Gramar without semicolon

[Monty Zukowski]

It looks like your grammar should be working.  Try turning on tracing 
(-traceParser when invoking antlr.Tool) and also inspect the generated 
code to get a feel for what antlr is trying to do.

Monty

ANTLR & Java Consultant -- http://www.codetransform.com
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On Jul 27, 2004, at 1:58 PM, Joan Pujol wrote:

> Hi,
>
> I've to write a compiler for a pseudocode language to
> use in a elearning platform.
> The pseudocode language, at first, don't use semicolon
> to end instructions(it's only used as a separator to
> use multiple instructions in a single line). And I
> have some problems with the gramar.
>
> I make a simple case with only two instructions an if
> and an assignament:
>
> instructions: (instruction)+;
> instruction: inst_if | inst_assig;
> inst_if: IF expr THEN (NL)* instructions (ELSE (NL)*
> instructions)? ENDIF ((NL)+ |SEMICOLON instruction);
> inst_assig: IDENT ASSIG expr ((NL)+ |SEMICOLON
> instruction);
>
> This I think that works quite well and recognizes
> thinks like
>
> IF expr THEN inst1;inst2
> ELSE  inst1
> END IF
>
> But it can't recognize
> IF expr THEN inst1 ELSE inst2 END IF
>
> And I don't know how to manage this, I think that I've
> to use semantic predicates but I am a little confused.
>
> Somebody knows how to manage this, or has implemented
> a similar grammar (without semicolon and similar to
> Visual Basic)
>
> Cheers,
>
> =====
> ---
> Joan Jesús Pujol Espinar
>
>
> 	
> 	
> 		
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