On 1/2/13, David A. Wheeler <dwhee...@dwheeler.com> wrote:
> Alan Manuel Gloria:
>> It should be trivial to create a Scheme interpreter in Java.
>> Actually, you don't even need a scheme interpreter: you just need a
>> set of classes to represent common Scheme types, and a virtual member
>> function on the base class to print out an s-expression. That way we
>> can use its output directly into a Scheme script that executes the
>> Java code on the t-expr input, slurps its s-expr output, and compares
>> it to the reference s-expr.
>
> I've done something like that in Java, and it's working! I've created
> output/scheme/Pair.java; a Pair represents a Scheme Pair, and it has static
> Scheme-like routines like cons, list, append, nullp (for "null?"), pairp,
> and so on. It's not a full Scheme, but it's enough so that action rules
> have a trivial mapping to Scheme (they basically use Scheme procedure names,
> with Java syntax). Scheme's () is represented as Java null, Scheme atoms
> are represented as Java strings, and rule results are "$RULENAME.v". Data
> is represented as Java type "Object" (which is the root of the Java class
> hierarchy).
>
> Here's an example, it looks pretty clear to me:
>
> body returns [Object v] :
> i_expr (same body1=body {$v = cons($i_expr.v, $body1.v);}
> | dedent {$v = list($i_expr.v);} ) ;
>
> Thoughts?
>
> I think this is better done in Java than in C++. For one thing, Java has
> automatic garbage collection, and C++ doesn't, which makes Java a better
> match to the problem.
*shrug* std::shared_ptr (or boost::shared_ptr for pre-C++11) should do
fine, especially since we don't handle the circular #1= stuff in the
spec anyway. Still, since there's already a Java class, that's fine
too.
Sincerely,
AmkG
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