[Jscheme-user] JScheme Pairs

[Peter H. <pe...@ex...>]

Hi,

A while ago I mentioned that I was using JScheme together with Antlr =
(http://www.antlr.org). My current code is a bit of a fudge, using Antlr =
to generate a Scheme 'String', which I evalute. However I'm looking to =
generate a class extending jsint.Pair and implementing =
antlr.collections.AST (the Abstract Syntax Tree interface) which should =
make a very powerful tool for language implementation.

My question is, what does my class (call it ASTPair) need to do to =
convince the Scheme interpreter that it is really a 'Pair'? The main =
issue is, how does the Pair relate to a Symbol - as with an AST every =
element is of the AST class, so for the 'first()' and 'getFirst()' =
methods of 'Pair' would I sometimes need to cast to a 'Symbol'?

thanks

Peter