6/1/2010 3:33 PM keltezéssel, Nathan Eloe írta:
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> Hello all,
> I'm working on an AST parser for the Bash language and I've come across the
> following strange behavior:
> I'm trying to handle comments, so I used the comments token you can get when
> you start a new grammar in ANTLRworks. It works.
>
> COMMENT
> : '#' ~('\n'|'\r')* '\r'? '\n' {$channel=HIDDEN;}
> ;
>
> The problem arises when the comment is the last thing from the input (i.e, no
> new line before EOF). Removing the '\n' from the token causes it to freak
> out when I run the tests, but I can't get it to match comments at the end of
> file. Leaving that '\n' in lets the code compile, but I still can't match
> that last case.
>
> Here's where the interesting part happens. When I run it through the
> debugger with the same test case that I use in gunit, the debugger allows the
> input and parses it correctly (meaning, it ignores it as it should) and
> correctly generates the expected AST.
>
> Does the debugger allow the code to be more robust in its decision making
> abilities? Or does it do something to the input to allow it to be matched to
> a token.
>
> Thanks for the help!
>
> Nathan
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>
What about
COMMENT
: '#' ~('\n'|'\r')* ('\r'? '\n')? {$channel=HIDDEN;}
;
?
Have you tried that?
Marton Papp
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