[NTG-context] update

[Hans Hagen]

Hi,

I uploaded a new version (both mkiv and lmtx). We removed some low level 
no longer used code (older engines), normalized some in the process, 
fixed a few things, etc.

=== lmtx only ===

While updating the cld manual I decided to also add an other table 
mechanism (in addition to the one already reported in an earlier mail). 
I have no clue how useful it is, but as usual with tex, users find ways 
to (ab)use it. This one behaves a bit more like registers. A hashed one 
is defined as:

\newhashedtable\somehashtable

\somehashtable{ foo = 123, bar = "foo" }
[123 = \the\somehashtable{foo}] [123 = \the\somehashtable foo ]
[foo = \the\somehashtable{bar}] [foo = \the\somehashtable bar ]

\bgroup
\somehashtable{ foo = 456, bar = "oof" }
[456 = \the\somehashtable{foo}]
[oof = \the\somehashtable{bar}]
\egroup

[123 = \the\somehashtable{foo}]
[foo = \the\somehashtable{bar}]

\bgroup
\global\somehashtable{ foo = 456 }
        \somehashtable{ bar = "oof" }
[456 = \the\somehashtable{foo}]
[oof = \the\somehashtable{bar}]
\egroup

[456 = \the\somehashtable{foo}]
[foo = \the\somehashtable{bar}]

or an indexed one:

\newindexedtable\someindextable

\someindextable{ 123, "foo" }
[123 = \the\someindextable 1] [123 = \the\someindextable \numexpr 2 - 
1\relax]
[foo = \the\someindextable 2] [foo = \the\someindextable \numexpr 1 + 
1\relax]

\bgroup
\someindextable{ 456, "oof" }
[456 = \the\someindextable 1]
[oof = \the\someindextable 2]
\egroup

[123 = \the\someindextable 1]
[foo = \the\someindextable 2]

\bgroup
\global\someindextable{ [1] = 456 }
        \someindextable{ [2] = "oof" }
[456 = \the\someindextable 1]
[oof = \the\someindextable 2]
\egroup

[456 = \the\someindextable 1]
[foo = \the\someindextable 2]

In both cases, local and global assignments are supported.

At the Lua end you can access these tables too:

context.hashedtables.somehashtable.bar
context.indexedtables.someindextable[2]

There is some overhead involved but performance and memory usage is 
quiite okay.

Hans



-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------