[antlr-interest] How exclude a symbol from lexer rule?

[Sergiy Karpenko]

Yeah  I know this way. But it is complicated when lexer rule has a lot of subrules. And I need both of them. Original rule and modified.      
    So, in this case there is a lot of work for update each subrule.  
  Decision, I chose, is:      
    CHAR:   CHARSET_WITHOUT_EXCHARS    I    EXCLUDED_CHARS;      
    CHARSET_WITHOUT_EXCHARS: ('a'..'j')|('l'..'z')|('0'..'9');      
    EXCLUDED_CHARS:   'k';      
    Thanks  
      
    Am 07.10.2008 16:40, Sergiy Karpenko schrieb:    
> Hi, all    
> For axample we have a lexer rule:    
>    
> CHAR : ('a'..'z')|('0'..'9');    
>    
> But, I want exclude from this sequence 'k' symbol.    
> Somethig like    
> EXTCHAR: CHAR ~'k' ;    
> [...]    
    
You can do it the other way around:    
    
EXTCHAR: ('a'..'j')|('l'..'z')|('0'..'9');    
CHAR: EXTCHAR|'k';    
    
HTH,    
Dennis Benzinger    
    
    
    
    
    
  
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