[antlr-interest] Grammar Problem

[Henrique]

Thanks for your replies guys!
Jim, I tried your suggestion but I get the same error...
Johannes, I believe I followed the approach suggested but the thing is I
need buncha_replacements optional...
Furthermore, when I try to parse this:

rule Foo {
    CIRCLE {}
}

I works good. So I'm guessing it's got something to do with me not making
buncha_adjustments optional the right way:

rule    : RULE USER_STRING (USER_RATIONAL)? LEFTBRACKET buncha_replacements?
RIGHTBRACKET;


buncha_replacements
    :    (replacement)+
    ;

replacement
    :    USER_STRING modification
    |    USER_STRING STAR modification USER_STRING modification
    ;

modification
    :    LEFTBRACKET buncha_adjustments? RIGHTBRACKET
    |    LEFTBRACE buncha_adjustments? RIGHTBRACE
    ;

buncha_adjustments
    :    (adjustment)+
    ;

Any more suggestions?
Thanks!

Henrique Nunes


On Thu, Aug 7, 2008 at 6:53 PM, Jim Idle <jimi at temporal-wave.com> wrote:

>  On Thu, 2008-08-07 at 18:40 +0100, Henrique wrote:
>
> Hi guys!
> I'm having some trouble with my grammar for parsing CFA files... As I
> posted before, I'm trying to convert their Yacc grammar to ANTLR and now I'm
> having some trouble. I suspect it's the left recursions or rather the way I
> got ridden of them.
> The grammar is attached and can also be seen here<http://hjrnunes.googlepages.com/antlrgrammar>
> .
>
> here's the rules I'm having trouble with:
>
> rule    :    RULE USER_STRING LEFTBRACKET buncha_replacements? RIGHTBRACKET
>     |    RULE USER_STRING USER_RATIONAL LEFTBRACKET buncha_replacements?
> RIGHTBRACKET
>     ;
>
>
> Try
>
> rule: RULE USER_STRING (USER_RATIONAL {set flag to say this is here or
> something} )? LEFTBRACKET buncha_replacements? RIGHTBRACKET;
>
>      Jim
>
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