[antlr-interest] RE: Lexer: C-style comments with DOS/UNIX newlines

[Nigel Sheridan-Smith]

> -----Original Message-----
> From: Nigel Sheridan-Smith [mailto:nbsherid at secsme.org.au]
> Sent: Friday, 20 August 2004 12:43 PM
> To: 'antlr-interest at yahoogroups.com'
> Subject: Lexer: C-style comments with DOS/UNIX newlines
> 
> 
> Hi there,
> 
> I'm a relative newcomer to ANTLR. I am trying to define C/C++/Java style
> comments, and having some trouble.
> 
> I have the following rule, similar to that in the manual (with k=3 and
> ANTLR 2.7.4):
> 
> 
> /* COMMENT rules */
> CCOMMENT: "/*"
>         ( options {greedy=false;}
> 
>          : '\r' ('\n')? {newline();}
>          | '\n' {newline();}
>          | .
>         )*
>        "*/";
> 


Just worked it out for myself, by looking at ANTLR's own grammar:
'antlr.g'... I changed it to the following:


/* COMMENT rules */
CCOMMENT: "/*"
        ( options {greedy=false; generateAmbigWarnings=false;}
        
         : '\r'      {newline();}
         | '\r' '\n' {newline();}
         | '\n'      {newline();}
         | ~('\n' | '\r') 
        )*
       "*/";


Thanks anyway!! I'm sure I will have another question soon enough :)

Nigel




--
Nigel Sheridan-Smith
PhD research student

Faculty of Engineering
University of Technology, Sydney
Phone: 02 9514 7946
Fax: 02 9514 2435





 
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