[antlr-interest] insert after tree?

[Gavin Lambert]

At 07:56 7/01/2008, Geoff hendrey wrote:
>likeExpression
>     :(concatenationExpression 'LIKE' concatenationExpression) 
> ->^('LIKE' concatenationExpression+ ESCAPE)     ;
>
>I added the imaginary ESCAPE token, but I have not had any luck 
>in my Java trying to replace the imaginary escape token with the 
>real text "ESCAPE '~'". If only I could add a *real* token 
>through my rewrite rule above , I would be in business.

The tree is a tree of tokens, not a tree of characters.  So you 
can't add an arbitrary '~' to it; you can only add a token 
representing a '~'.  Any tokens you insert manually into the 
stream are imaginary tokens, because they're not tied to the input 
stream.  This is no different.

Note that even if you do add a TILDE token or something that 
represents the '~', unless you do something convoluted it won't 
have any text or source location.  You'll need to match it based 
on token type rather than contents.