Thanks for the response. I'm aware of the left factoring approach, however then the alternative:
markup+ ';' will have a higher priority then: markup+ expression ';' which is invalid for my language. Is there any way to specify priorities other then the ordering of alternatives? On Aug 29, 2009 2:20pm, Martijn Reuvers <[email protected]> wrote: > Hi Jeroen, > I would rewrite the markupStatement like this: > markupStatement : > markup+ (expression | regularStatement | embedding)? ';' > That way its valid again. The markup+ in each of your choices is the > problem now I guess. > Martijn > On Sat, Aug 29, 2009 at 12:57 PM, Jeroen van > [email protected]> wrote: > > Can somebody please tell me what is recursive about the markupStatement > > production in the following grammar? The problem disappears when I > remove > > the expression NT symbol from argument, but this is required for my > > language. Is it solvable without having to enable backtracking? > > markupStatement: markup+ expression ';' > > | markup+ regularStatement ';' > > | markup+ embedding ';' > > | markup+ ';' > > ; > > where.. > > markup: IDCON attributes arguments? > > -> ^( MARKUP IDCON attributes arguments? ) ; > > attributes: attribute* > > -> ^( ATTRIBUTES attribute* ); > > attribute: '#' IDCON // ID attribute > > | '.' IDCON // Class attribute > > | '$' IDCON // Name attribute > > | ':' IDCON // Type attribute > > | '@' NATCON // Width attribute > > | '@' NATCON '%' NATCON // Width-height attribute > > ; > > arguments: '(' argument? ( ',' argument )* ')' ; > > argument: expression > > | IDCON '=' expression ; > > expression: ( IDCON | NATCON | TEXT | SYMBOLCON > > | '[' expression? ( ',' expression )* ']' // List > > | '{' keyValuePair? ( ',' keyValuePair )* '}' // Record > > ) ( '+' expression | '.' IDCON )* ; > > keyValuePair: IDCON ':' expression ; > > regularStatement: 'echo' expression ';' ; > > embedding: PRETEXT embed textTail ; > > embed: markup* expression ; > > textTail: POSTTEXT | MIDTEXT embed textTail ; > > > > List: http://www.antlr.org/mailman/listinfo/antlr-interest > > Unsubscribe: > > http://www.antlr.org/mailman/options/antlr-interest/your-email-address > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "il-antlr-interest" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/il-antlr-interest?hl=en -~----------~----~----~----~------~----~------~--~---
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