[antlr-interest] greedy options on parser rule or look ahead sematics predicate

[向秦贤]

oops, soooorry again, this test grammar should be this,
grammar OnGreedy;
options{output=AST; ASTLabelType=CommonTree;}
tokens{ARRAY;STRING;STR;}
pairs	:	pair (';'LINE? pair)* (';' | LINE)?;
pair	:	stringArray ':' stringArray;
stringArray:string (options{greedy=false;}:(',' LINE? string)*) (','
|LINE)?->^(ARRAY string+);

string: words->^(STR[$text]);

words: WORD+;
WORD:(~(' '| '\t'|',' |';' | ':' | '\r' | '\n'))+;
WS	:	(' ' | '\t')+ {$channel=HIDDEN;};
LINE	:	('\r'?'\n')+
//	{$channel=HIDDEN;}
	;

Sooooorry:)
Questions is questions:)

2007/8/28, 向秦贤 <fyaoxy at gmail.com>:
> So Sooooorry, this grammar should be this,
>
> grammar OnGreedy;
> options{output=AST; ASTLabelType=CommonTree;}
> tokens{ARRAY;STRING;STR;}
> pairs   :       pair (';' pair)* (';' | LINE);
> pair    :       stringArray ':' stringArray;
> stringArray:string (options{greedy=false;}:(',' LINE? string)*) (','
> |LINE)?->^(ARRAY string+);
>
> string: words->^(STR[$text]);
> words: WORD+;
> WORD:(~(' '| '\t'|',' |';' | ':' | '\r' | '\n'))+;
> WS      :       (' ' | '\t')+ {$channel=HIDDEN;};
> LINE    :       ('\r'?'\n')+
> //      {$channel=HIDDEN;}
>         ;
>
> Questions is yet that questions:)
> I mistake at extracting it from full grammar.
> Thanks
>
> 2007/8/28, 向秦贤 <fyaoxy at gmail.com>:
> > Hi,
> > I have a grammar with conflict semantics, I cannot handle this right.
> > here is grammar.
> >
> > grammar OnGreedy;
> > options{output=AST; ASTLabelType=CommonTree;}
> > tokens{ARRAY;STRING;STR;}
> > pairs   :       pair (':' pair)* (';' | LINE);
> > pair    :       stringArray ':' stringArray;
> > stringArray:string (options{greedy=false;}:',' LINE? string)* ','
> > LINE?->^(ARRAY string+);
> >
> > string: words->^(STR[$text]);
> > words: WORD+;
> > WORD:(~(' '| '\t'|',' |';' | ':' | '\r' | '\n'))+;
> > WS      :       (' ' | '\t')+ {$channel=HIDDEN;};
> > LINE    :       ('\r'?'\n')+
> > //      {$channel=HIDDEN;}
> >         ;
> >
> > Supported input:
> > name:a,b,c,
> > a,b,c,
> > a,b,c:value;
> >
> > As you see, I hope this parsed result is :
> > name:a,b,c,a,b,c;
> > a,b,c:value;
> > Yes, I hope pair rule's value part (stringArray) greedy, and make
> > closest rule match next to a new pair.
> >
> > My questions are:
> > 1, I hope greedy options can work fine like in lexer. seems I cannot
> > get right result.
> > 2, I wanna use semantics predicate like some syntactics predicate rewrite rule,
> > (stringArray !pair)=>stringArray
> > 3, maybe in code do this work, but there need handle newline, and
> > match follow rule, I not sure if it is acceptable or effective.
> >
> > There are some good ways to handle this case?
> > Thanks
> >
> > --
> > 致敬
> > 向秦贤
> >
>
>
> --
> 致敬
> 向秦贤
>


-- 
致敬
向秦贤