[antlr-interest] Adding one newline changes tokens recognized
Jan van Mansum
janvanmansum at gmail.com
Mon Oct 6 08:02:52 PDT 2008
Hello group,
I have the following grammar:
--- TestComment.g ---
grammar TestComment;
input
: (statement ';')*
;
statement
: ANNOTATION
;
ANNOTATION
: '--!' .* '\n'
;
COMMENT
: '--' .* '\r'? '\n' {$channel = HIDDEN;}
;
WS : (' '|'\n'|'\r'|'\t')+ {$channel = HIDDEN;}
;
---
And the following input (without the double quotes):
"--!myAnnotation
;"
This doesn't work. "--!myAnnotation" is considered an ordinary comment by
Antlr and hidden. I don't understand why, as I thought that antlr should
match the tokens in order, and so find that ANNOTATION matches the input.
If I add one more newline to the file that does happen.
Can anyone explain to me why that is? I am puzzled.
I am using antlr 3.0.1 by the way.
Thanks for any help,
best regards,
--
Jan van Mansum
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