[antlr-interest] Enhancement request for identifying imaginary tokens

[Terence Parr]

Hi Stephen, i'm not sure what you are asking for.  You must say what  
root node to create.  How would antlr know what you want?

thanks,

Ter
On Dec 13, 2007, at 2:47 PM, Hardy, Stephen wrote:

> Maybe I missed something, but it would be nice if there was an  
> option to
> automatically "identify" all imaginary tokens.  Currently, this  
> requires
> explicit identification as per the following example:
>
> struct_declarator
>    : declarator (':' constant_expression)?	
>        -> ^(STRUCT_DECLARATOR[$start] declarator constant_expression?)
>    | ':' constant_expression			
>        -> ^(STRUCT_DECLARATOR_ANON_BITFIELD[$start]
> constant_expression)
>    ;
>
>
> Admittedly, it's not all that difficult to put the
> MY_IMAGINARY_TOKEN[$start] construct everywhere in the tree writing
> part, but it does make the code less readable.  Having an option to do
> this by default would be very handy when debugging tree walkers.
> Something like
>
> options {
>  IdentifyImaginaryTokensWithStart = true;
> }
>
> Regards,
> SJH
>