I had a couple of fixes sitting in my repository that addressed some of these issues. I've since pushed them up.

Daniel Gackle wrote:

The following bug in PS broke my code today:

(ps (aref (if (and x (> (length x) 0)) (aref x 0) y) z)) => "x && x.length > 0 ? x[0] : y[z];"

This now returns:

(x && x.length > 0 ? x[0] : y)[z];

You can see a similar bug here:

(ps (aref (or (slot-value x 'y) (slot-value a 'b)) z)) => "x.y || a.b[z];"

This now returns:

(x.y || a.b)[z];

and here again:

(ps (- (if x y z))) => "-x ? y : z;"

The changes I pushed didn't help that one. As I recall, that's actually why I hadn't pushed them yet, because I wanted to look into the overall precedence issue more thoroughly (but then of course, life refocused my attention elsewhere).

Clearly, there's a problem with not parenthesizing things.

Since the last patch or two I've sent have been ignored, I won't send a new one here, but rather ask: is PS being actively maintained or not? This project is too valuable to let fade.

Vladimir may be working on integrating your patches here and making other changes in this area, so I won't step on his toes if that's the case, except to push the fixes I'd already made.

Thanks for your continued interest in the project. You're quite right that ParenScript is an important library that deserves better than the off and on interest many of us can devote to it.

Long term I think the project should be able to take a more systematic approach to supporting the ECMAScript standards. I think we can also move towards doing more parse tree analysis in the compile step rather than the simple translations we currently perform. I'd like to implement such features as termination analysis to get rid of the need for those ugly (return) statements, and perhaps add a way to unfold or trampoline tail recursions.

Cheers,

-- Travis