[antlr-interest] Re: Request enhancement ANTLR

Ric Klaren klaren at cs.utwente.nl
Mon Sep 16 01:54:58 PDT 2002


On Sat, Sep 14, 2002 at 09:20:57PM -0700, Terence Parr wrote:
> I've added getFilename/setFilename methods (empty impl) to Token.java, 
> but I'm not sure about adding the ctor to NoViableAltException and the 
> code generator.  Seems that now you'll get the filename but unless I 
> add real functionality to Token it will have a bogus default filename.  
> Hmm...plus, what about other exceptions?  Seems I'd have to make wide 
> changes.  I'll add the basic interface for now and see what happens I 
> guess.

Maybe in the long run we should remove the column/line/filename stuff and
replace it by a user definable class, with according set/get methods. This
would add most flexibility in possiblities to store stuff with the token.

Something like this:

public NoViableAltException( Token t, Parser p ) {
   super("NoViableAlt", p.getFilename(), p.getLine(), p.getColumn());
   token = t;

Then if we add options to specify the name of the used NoViableException or
a factory or something like it, then we have all the tools to customize
easily at will.

If I ever get time for a C++ backend TNG then I'll probably go that way,
for a first prototype.


    ---- Ric Klaren ----- klaren at cs.utwente.nl ----- +31 53 4893722  ----
     Innovation makes enemies of all those who prospered under the old
   regime, and only lukewarm support is forthcoming from those who would
               prosper under the new. --- Niccolò Machiavelli


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