[il-antlr-interest: 25248] Re: [antlr-interest] Lexer rules

Sat, 15 Aug 2009 08:01:24 -0700

Sam Barnett-Cormack wrote: 
Marwan Ajraoui wrote:
  
Hi everybody;

Having this lexer rules, parsing the input doesn't recognize 'integer'
as a type, only recognize types vector of integer as a token like
integer[] or integet[][][].

CORCHE_CIERE:']';

CORCHE_ABRE: '[';

fragment ENTERO_T: 'integer';

ENTERO_V: ENTERO_T(CORCHE_ABRE CORCHE_CIERE)*;

Am i missing something; I did try without fragment, and the same result.
    

Off the top of my head, it should match any of 'integer', 'integer[]' 
and 'interger[][][]' as ENTERO_V tokens.

I think there's some rethinking wants to be done between what is in the 
lexer and what is in the parser. For example, isn't '[]' really an 
operator, or modifier, and wants to be dealt with in the parser, not 
bundled into the same token?
ENTERO_T needs to be a non-fragment, ENTERO_V needs to be a parser rule, you need to cater for whitespace and so on...

CORCHE_CIERE : ']';

CORCHE_ABRE  : '[';

ENTERO_T     : 'integer';


entero_v     : ENTERO_T (CORCHE_ABRE CORCHE_CIERE)* EOF;


Jim





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