[antlr-interest] Unreachable production

[Darach Ennis]

Hi Andrei,
You can make ID and QW 'fragment' rules as follows to get rid of the
warning:

grammar Name;
start: wordList ;
wordList: '[' Name (',' Name)* ']';
Name:   ID | QW;
fragment ID:    ('a'..'z'|'A'..'Z')+ ;
fragment QW:    '"' ('a'..'z'|'A'..'Z') (' '|'a'..'z'|'A'..'Z')*
('a'..'z'|'A'..'Z') '"';
WS:    (' '|'\t' |'\r'|'\n')+ {skip();} ;

Regards,

Darach.

On Sun, Mar 30, 2008 at 9:02 PM, <andrei.majidian at bt.com> wrote:

>  Hi
>
> I am trying the Interpreter for the following grammar Name.g
>
> _____________________________________________
> grammar Name;
>
> start: wordList ;
>
> wordList: '[' Name (',' Name)* ']';
>
> Name:   ID | QW;
>
> ID:    ('a'..'z'|'A'..'Z')+ ;
> QW:    '"' ('a'..'z'|'A'..'Z') (' '|'a'..'z'|'A'..'Z')*
> ('a'..'z'|'A'..'Z') '"';
> WS:    (' '|'\t' |'\r'|'\n')+ {skip();} ;
> ____________________________________________________
>
> With the following input:
>
> ["wild  animal", "friendly", timid]
>
> It gave me the following Warning in the console
>
> "[21:52:57] warning(208): Name.g:10:1: The following token definitions are
> unreachable: ID,QW
> [21:52:57] Interpreting…"
>
> What does this mean?  The parse-tree is correctly produced. I don't
> understand the warning.
>
> Thanks
>
> Andrei
>
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