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From: Neil Madden on 2 Jul 2008 16:12
jalitt(a)gmail.com wrote:
> Okay, taming spidermonkey is one possibility. I also found -
> http://browsex.com/jstcl.html , which might be able to do the trick.
> The source is available from the site. Maybe I'll get a chance to
> play around with that or spidermonkey in the near future. I think
> that developing a method of HTTP access behind these large corporate
> firewalls would be an asset to the community.

I've also wanted easy access to JavaScript from Tcl before (web-scraping
needs it more and more these days). Well, I didn't feel like hacking
around with SpiderMonkey (the install instructions seemed to start with
a dozen or so dependencies, like most Mozilla stuff...), so I instead
opted to quickly wrap the NJS JavaScript interpreter library
(http://www.njs-javascript.org/), which is lightweight and pretty
decent. I've put the result up at: http://www.cs.nott.ac.uk/~nem/tcl/ as
the "tcljs" package. Note: it's LGPL as that is the license NJS uses
(fine for me). Usage:

package require tcljs 1.0
tcljs js ;# create interpreter instance
js eval {
function foo(a, b) { return a * b; }
foo(12, 23)
}

Should make things pretty simple :-) Note though, that NJS does mention
that it is not an entirely standards-compliant interpreter, so possibly
might fail on some things. Should be fine for proxy .pac files, I'd
guess, though.

I was thinking about adding some more features to this, but then I
remembered that TkHTML also has a JavaScript library -- this time to the
SEE lib. See http://tkhtml.tcl.tk/hv3.html and the file hv3see.c for
details. So, it looks like we are now spoiled for choice of JS
interpreter bindings in Tcl... :-)

Cheers,

-- Neil
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