[antlr-interest] Re: A question about extracting comments

[Brian Smith]

Fan,

I'm sorry, I didn't read your problem correctly. It indeed seems like 
you will need to use a predicate. I've never used a predicate in the 
lexer before so I'm not sure how it all works.

Sorry,
Brian

Fan Yang wrote:
> Hi Brian,
> 
> According to your suggestion, I have modified my lexter which is 
> showing below. I think I used it in a wrong because there is an error 
> like:
> 
> ANTLR Parser Generator   Version 2.7.1   1989-2000 jGuru.com
> error: Lexer rule REM is not defined
> MyVB.g:804: no definition of rule mREM
> 
> I'm sorry I ask you guys so many naive questions. 
> 
> Regards,
> 
> fan
> /* ---  Test.g Begin  --- */
> 
> class MyLexer extends Lexer;
> options {
>  k=4;                	
>  exportVocab=DIALECT;	
>  testLiterals=false;
>  caseSensitiveLiterals=false;
>  caseSensitive=false;
> }
> 
> tokens{
> REM="rem";
> }
> 
> COMMENT
>   : (REM |'\'')
>     (~('\n'|'\r'))* ('\n'|'\r'('\n')?)
>     {std::cout<<$getText<<std::endl; $setType(ANTLR_USE_NAMESPACE     
> (antlr)Token::SKIP); newline();}
>   ;		
> 		
> // Whitespace -- ignored
> WS_ 
>   :(' '
>    |'\t'
>    ){ _ttype = ANTLR_USE_NAMESPACE(antlr)Token.SKIP; }
>   ;
> 
> /* ---  Test.g End  --- */
> 
> --- In antlr-interest at y..., Brian Smith <brian-l-smith at u...> wrote:
> 
>>tokens {
>>    REM="rem";
>>}
>>
>>Fan Yang wrote:
>>
>>>Thank all of you.
>>>
>>>I don't know how to put "rem" into the lexer's tokens table:(. 
>>
> Would 
> 
>>>you please give me some hints?
>>>
>>>BTW, I'm looking for Ter's post on the list.
>>>
>>>Have a nice weekend,
>>>
>>>Fan
>>
> 
> 
>  
> 
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> 


 

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