[antlr-interest] Parsing comments

[Jim Idle]

You just don't consume after the '@' then and that token will stop  
there.

Jim

On Sep 17, 2009, at 9:59 AM, Soren Holstebroe <holstebroe at gmail.com>  
wrote:

> Thank you for your answer,
>
> As i understand it, your suggestion considers the whole template  
> line as a single token, but I don't want the template token to eat  
> up the rest of the line, since this is where my template wrapping  
> grammar would be.
>
> My grammar will have rules like this:
>
> wrap_option
>     : WRAP_OPTION_BEGIN
>     (  'WRAP'
>     | 'TEMPLATE' '<' type_specifier (',' type_specifier)* '>'
>     )
>     ;
>
> so I need something to match '//' WS* '@' as my WRAP_OPTION_BEGIN.
>
> Soren
>
> 2009/9/17 Indhu Bharathi <indhu.b at s7software.com>
> Try using semantic predicates to look-ahead and decide whether to  
> emit SLCOMMENT or TEMPLATE
>
>
>
> Something like:
>
>
>
> fragment SLCOMMENT
>
>                 :               ;
>
>
>
> fragment TEMPLATE
>
>                 :               ;
>
>
>
> SLCOMMENT_OR_TEMPLATE
>
>                 :               '//' (
>
>                                                 { input.LA(1)=='@' }? 
> => ( options {greedy=false;} : . )* EOL    { $type=TEMPLATE; }
>
>                                 |              ( options  
> {greedy=false;} : . )* EOL    { $type=SLCOMMENT; }
>
>                                 )
>
>                 ;
>
>
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