[antlr-interest] Preserve C/C++ comments in ANTLR v3
Amal Khailtash
akhailtash at gmail.com
Sun Dec 16 19:41:59 PST 2007
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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