On Mon, Jan 18, 2010 at 8:42 AM, Brendan Eich <[email protected]> wrote:
> On Jan 18, 2010, at 4:38 AM, Mark S. Miller wrote: > > Obviously, I will have many positive things to say about the Valija > approach for accommodating legacy. In fact, it was invented in order to cope > with the "highly popular Prototype library" you mention below. However, the > picture is not as rosy as "a burden [only] on implementors". The semantics > of computing between Valija contexts are complicated, in similar but > different manner to how the semantics of JS across frames is complicated > today. If there's interest, I can present Valija with slides 10-15 of < > http://ses.json.org/millerses.pdf>. > > > Perhaps Valija is not the last word on this approach :-/. There's the > system Adam Barth is developing -- have you checked that out? > > Yes. AFAICT, it is solving a different problem. > > >> * The highly popular Prototype library, and a lot of extant code, >> modifying primordials. If all such code must be rewritten to work in/with >> modules, then modules have a steep adoption hill to climb. >> >> > I don't quite understand this. Prototype does not currently work with > modules, so some rewrite is necessary in any case. As long as we're talking > about future Prototype, my impression is that they wanted to migrate away > from mutating primordials eventually anyway. > > > Tobie et al. may want to, but I know many *users* of Prototype who do not. > We're talking about a large number of actual uses, some of which might want > to migrate into a module, not necessarily be used cross-module. The cost of > doing so is low if primordials in that module can be mutated. It goes way up > if they can't. > > Huh? I don't understand this. If they wish to be in the same mutated-primordial-sandbox as Prototype, as you indicate and seems likely, then it would not help them if Prototype were packaged as a module and modules were the unit of primordial-mutation-sandboxing. Why should they not just load the existing Prototype into their frame the old fashioned way? Or, yes, they could do the Valija thing, in order to multiplex a frame among multiple sandboxes. But a Valija sandbox is not a module. I think we're confusing levels. /be > > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > > -- Cheers, --MarkM
_______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
