At a certain point in their investigation into Lua, a Wikipedian said
that it was a done deal, barring last-minute revelations that Lua has
some sort of a sordid past. The Kollos investigation of Lua is pretty
much at the same point. I'm not making a "final" announcement, but it
looks like Lua will be the language of Kollos's semantics.
As background -- Marpa allows full Perl callbacks, but these can be
slow, especially for trivial tasks. So many of the simpler tasks (such
as return the first child, or return all the children as a blessed
array) are performed with a very fast Marpa-internal mini-VM. This
mini-VM has 22 instructions -- it's evolving into a language. There's a
history of gradually evolved languages, and it's littered with disasters
-- JCL and vim macros come to mind. The Wikipedians found their
templating language was headed in a similar direction, and realized they
needed to stop before heading down that path. Lua was their answer.
I have a question, aimed at those G+ group readers who are Lua-versed
(if there are any). What version of Lua? There is now a LuaJIT, based
on Lua 5.1, which is widely used to rave reviews. It's apparently as
fast as Java's JIT, or faster, depending on which benchmark you use.
The implications of this for Kollos interface are, I think, obvious.
Lua's latest stable version is 5.2, but LuaJIT is based on Lua 5.1, with
selected Lua 5.2 features added. Users seem to be happy with this.
CPAN has a Alien::LuaJIT, which installs LuaJIT version 2.0.2. I'm
thinking of requiring (at least initially) LuaJIT 2.0.2 or better.
Thanks, jeffrey
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