[antlr-interest] rule is ambiguous (tree grammar)

jeroen.v.schagen at gmail.com jeroen.v.schagen at gmail.com
Sun Aug 16 01:39:48 PDT 2009


Nevermind the above question, the problem was caused by a $markupChain  
reference in my action code.

On Aug 16, 2009 10:33am, jeroen.v.schagen at gmail.com wrote:
> The below parser grammar works, however when copying the rewrite rules  
> into my tree grammar (as stated in the book). I seem to get the following  
> error: reference $markupChain is ambiguous; rule markupChain is enclosing  
> rule and referenced in the production (assuming enclosing rule). Anybody  
> knows a solution that will fix my tree grammar?

> Thanks in advance,
> Jeroen


> Parser grammar

> markupChain: markup markupChain
> -> ^( MARKUP_CHAIN markup markupChain )
> | expression ';'
> -> ^( MARKUP_CHAIN expression ';' )
> | statement
> -> ^( MARKUP_CHAIN statement )
> | embedding ';'
> -> ^( MARKUP_CHAIN embedding ';' )
> | ';'
> -> ^( MARKUP_CHAIN ';' ) ;

> Tree grammar

> markupChain: ^( MARKUP_CHAIN markup markupChain )
> | ^( MARKUP_CHAIN expression ';' )
> | ^( MARKUP_CHAIN statement )
> | ^( MARKUP_CHAIN embedding ';' )
> | ^( MARKUP_CHAIN ';' ) ;

> URL:  
> http://code.google.com/p/waebric/source/browse/trunk/implementations/java/antlr/src/main/grammar/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.antlr.org/pipermail/antlr-interest/attachments/20090816/192c1a55/attachment.html 


More information about the antlr-interest mailing list