I have a very simple grammar where I am attempting to parse some C++ code. The
input is very simple and I am having trouble figuring out how to parse (lex?) a
line. What I want to do is match a '#define" and then the rest of the line. I
don't care what is in the rest of the line (even if empty) but I do want it
passed to a processing function where I can examine its contents. The code
snippet I have used is
definestatement
: '#define' defineoption
;
defineoption
: RESTOFLINE
;
...
COMMENT
: '/*' ( options {greedy=false;} : . )* '*/' {$channel=HIDDEN;}
;
LINE_COMMENT
: '//' ~('\n'|'\r')* '\r'? '\n' {$channel=HIDDEN;}
;
RESTOFLINE
: ~('\n'|'\r')* '\r'? '\n'
;
This was taken out of the example grammar for 'C' and modified.
The problem is that when I attempt to use a RESTOFLINE in the grammar, the
parser stops with an Unexpected Token at the terminal */ of the comment in the
header. It doesn't seem to make any difference if I modify LINE_COMMENT to
contain the RESTOFLINE item or not.
Questions:
1. How can I capture the rest of the line into a string that I can examine in
the function handling that expression?
2. Why doesn't the above construct work?
The grammar generates and compiles ok in Visual Studio 2008.
Thanks
Sterling
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