On 9/25/2015 4:09 PM, Orion Poplawski wrote:
I'm just starting to take a look how luatex makes use of lua. And it
appears that luatex does not merely use lua, but extends it in various
ways, essentially creating new lua dialect. Is the assessment correct?
Is there any documentation on this?
Indeed we have some more on board. Keep in mind that lua is used as
extension language so whenever it's used in an application there can be
extensions.
Btw, a dialect implies a different language. Adding a couple of
functions is not making it a dialect.
Also, is luajit used in the same way, or would it be possible to use a
system installed luajit in building luatex?
The only benefit of luajit is the faster virtual machine. A downside is
that there are some limitations in memory cq. stack usage. We use a
patch that makes the string hashing faster (we use the normal lua method
instead of the luajit one that is optimizied for urls and that can make
luajit slower than lua).
Becaus eluatex uses lua as extension language it will always be shipped
with a specific version (linked in or alongside the binary).
Hans
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