Preserve C/C++ comments in ANTLR v3

I need to extract comments from C/C++/Java source file. Normally
comments
are thrown away and they are defined as lexer rules (in ANTLR v3):


    // Single-line comments
    SL_COMMENT
        : '//' ( ~('\r'|'\n')* ) '\r'? '\n' {skip();}
        ;


    // Multi-line comments
    ML_COMMENT
        : '/*' (options {greedy=false;} : .)* '*/' {skip();}
        ;


Basically I need something like this:


    comment : sl_comment | ml_comment ;


    sl_comment : '//' COMMENT_LINE ;


    ml_comment : '/*' COMMENT_TEXT '*/' ;


How do I define COMMENT_LINE and COMMENT_TEXT? Especially if I am
ignoring
whitespace, it becomes more confusing.


Any hints or pointers would be appreciated,
-- Amal

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