To exclude the /* and */ would something like this work?
COMMENT
: '/*'! ( options {greedy=false;} : . )* '*/'!
;
-----Original Message-----
From: antlr-interest-boun...@antlr.org
[mailto:antlr-interest-boun...@antlr.org] On Behalf Of Andreas Volz
Sent: September 23, 2009 5:36 PM
To: antlr-inter...@antlr.org
Subject: [antlr-interest] Question with greedy
Hello,
I wrote this grammar:
startrule
: (property comment property)*
;
comment
: COMMENT { printf("Comment: \%s\n", $COMMENT.text->chars); }
;
COMMENT
: '/*' ( options {greedy=false;} : . )* '*/'
;
property
: TOKEN { printf("Property: \%s\n", $TOKEN.text->chars);}
TOKEN
: (ALPHA | DIGIT)+
fragment DIGIT
: '0'..'9'
;
fragment ALPHA
: 'a'..'z' | 'A'..'Z' |'@'|'.'| ' '
;
The input is:
This is a test /* with a comment */ in the middle
This is a test /* with a comment */ in the middle
This is a test /* with a comment */ in the middle
The result looks good, but some errors are print out:
test.txt(1) : lexer error 3 :
at offset 49, near char(0XA) :
This is a test /* w
test.txt(2) : lexer error 3 :
at offset 50, near char(0XA) :
This is a test /* w
test.txt(3) : lexer error 3 :
at offset 50, near char(0XA) :
Property: This is a test
Comment: /* with a comment */
Property: in the middle
Property: This is a test
Comment: /* with a comment */
Property: in the middle
Property: This is a test
Comment: /* with a comment */
Property: in the middle
BTW: The line ending in this file is 0x0A.
Could anyone explain this error and how to prevent it?
Second question: How do I not include the '/*' and '*/' tags in the
comment match?
regards
Andreas
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