Lars, Could you comment on this?
I see from your post @ http://www.nabble.com/Eval-invisible-let-bindings-td14182651.html#a14182651 that you have definite ideas about "the current ES4 proposal" for eval. What is that proposal? Is it written down anywhere? I tried the reference implementation, but it seems to implement eval as a simple string identity operation: ~/src/es4$ ./es4 ECMAScript Edition 4 RI v0.0M2 (Fri Feb 15 13:37:13 2008) >> x=1 1 >> eval('x') x >> I see some notes written down @ http://wiki.ecmascript.org/doku.php?id=proposals:resurrected_eval and http://wiki.ecmascript.org/doku.php? id=discussion:resurrected_eval, but they make no mention of "this", and both posts point to open questions, not a finished proposal. I searched bugs.ecmascript.org but the best thing I found was ticket #226, which discusses when ES4-style eval should kick in, not what it is. Is there anywhere else I should be looking? Thanks, Geoff On Mar 5, 2008, at 7:26 PM, Geoffrey Garen wrote: > Hi all. > > I'm trying to implement an ES4-compliant version of eval, but I'm > having trouble understanding what the specified behavior is. > > In ES4, > > eval(x) > > is distinct from all of > > window.eval(x) > > eval.call(myThisObject, x) > > frames[0].eval(x) > > in that the first form is an operator, and the last three forms are > function calls. > > Right? > > OK, for the eval operator, the eval function, the eval function called > with a specified 'this' object, and the eval function called on > another global object, respectively: > > What scope chain should be used? > > What variable object should be used? > > What value should 'this' take on? > > What gets called if window.eval has been overridden, as in (at global > scope): > > eval = function() { return "overridden"; } > eval(x); > > or > > window.eval = function() { return "overridden"; } > window.eval(x); > > What gets called if the "eval" identifier has been shadowed by a > variable in scope, as in: > > with({ eval: function() { return "overridden"; } }) { > eval(x); > } > > or > > try { > throw function() { return "overridden"; }; > } catch(eval) { > eval(x); > } > > ? > > Thanks, > Geoff > _______________________________________________ > Es4-discuss mailing list > Es4-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es4-discuss _______________________________________________ Es4-discuss mailing list Es4-discuss@mozilla.org https://mail.mozilla.org/listinfo/es4-discuss
