[antlr-interest] NoViableAlt

[Kirby Bohling]

Without actually running it, I'm pretty sure it's because '3' is
lexing to be 'DIGIT' (it's the first rule, if DIGIT had been below NUM
I think it might have "worked").

So the lexer returns 'DIGIT', which no rule from your parser accepts.
You likely meant to declare the DIGIT as a fragment.  At which point,
I think it'd start doing what you expect it to.

Kirby

On Tue, Apr 13, 2010 at 5:28 PM, Rick Mann <rmann at latencyzero.com> wrote:
> Why do I get a "NoViableAltException" when parsing "3", but when parsing "asd" I get "asd" (in the ANTLRWorks Interpreter):
>
> top     :        expr;
>
> expr    :       multExpr (('+'|'-') multExpr)*;
> multExpr:       atom ('*' atom)*;
> atom    :       NUM | ID | '(' expr ')';
>
> LETTER  :       'a'..'z' | 'A'..'Z';
> DIGIT   :       '0'..'9';
> ID      :       LETTER (LETTER | DIGIT)*;
> NUM     :       DIGIT+ ('.' DIGIT+)?;
>
> TIA,
> --
> Rick
>
>
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