[antlr-interest] Re: Nondeterministically blind
epovazan
epovazan at telus.net
Sat Dec 8 17:33:25 PST 2001
> You didn't include the error message that I could see, but I'm
guessing
> you have a problem in that your string chars can include the quote
and
> double-quote chars, which will conflict with the start/end of the
> string :)
>
> Good luck,
> Terence
Wow, thank for the speedy reply!
The error is:
ANTLR Parser Generator Version 2.7.1 1989-2000 jGuru.com
PyLex.g:43: warning: lexical nondeterminism upon
PyLex.g:43: k==1:'"','\''
PyLex.g:43: k==2:'"','\''
PyLex.g:43: k==3:'"','\''
PyLex.g:43: k==4:'\u0000'..'\u00ff'
PyLex.g:43: between alts 1 and 2 of block
I modified the STRING_LIT rule as follows and it compiles ok:
STRING_LIT:
(("'''") | ("\"\"\"")) => LONG_STRING
| SHORT_STRING ;
However the generated code with the warnings looks like it will
execute correctly too.
It's crazy ... I can do anything except not get nondeterminsm
warnings. Thanks for a great tool, eventually I will "get it" and the
rest works for me well (tree parsing is great) An in a few weeks, I
will have a Python grammar for your collection :)
-Ed
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