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-% language=uk
-
-\environment luatex-style
-\environment luatex-logos
-
-\startcomponent luatex-introduction
-
-\startchapter[title=Introduction]
-
-This is the reference manual of \LUATEX. We don't claim it is complete and we
-assume that the reader knows about \TEX\ as described in \quotation {The \TEX\
-Book}, the \quotation {\ETEX\ manual}, the \quotation {\PDFTEX\ manual}, etc.
-Additional reference material is published in journals of user groups and
-\CONTEXT\ related documentation.
-
-It took about a decade to reach stable version 1.0, but for good reason.
-Successive versions brought new functionality, more control, some cleanup of
-internals and experimental features evolved into stable ones or were dropped.
-Already quite early \LUATEX\ could be used for production and it was used on a
-daily basis by the authors. Successive versions sometimes demanded a adaption to
-the \LUA\ interfacing, but the concepts were unchanged. The current version can
-be considered stable in functionality and there will be no fundamental changes.
-Of course we then can decide to move towards version 2.00 with different
-properties.
-
-Don't expect \LUATEX\ to behave the same as \PDFTEX ! Although the core
-functionality of that 8 bit engine was starting point, it has been combined with
-the directional support of \OMEGA\ (\ALEPH). But, \LUATEX\ can behave different
-due to its wide (32 bit) characters, many registers and large memory support.
-There is native \UTF\ input, support for large (more that 8 bit) fonts, and the
-math machinery is tuned for \OPENTYPE\ math. There is support for directional
-typesetting too. The log output can differ from other engines and will likely
-differ more as we move forward. When you run plain \TEX\ for sure \LUATEX\ runs
-slower than \PDFTEX\ but when you run for instance \CONTEXT\ \MKIV\ in many cases
-it runs faster, especially when you have a bit more complex documents or input.
-Anyway, 32 bit all||over combined with more features has a price, but on a modern
-machine this is no real problem.
-
-Testing is done with \CONTEXT, but \LUATEX\ should work fine with other macro
-packages too. For that purpose we provide generic font handlers that are mostly
-the same as used in \CONTEXT. Discussing specific implementations is beyond this
-manual. Even when we keep \LUATEX\ lean and mean, we already have enough to
-discuss here.
-
-\LUATEX\ consists of a number of interrelated but (still) distinguishable parts.
-The organization of the source code is adapted so that it can glue all these
-components together. We continue cleaning up side effects of the accumulated
-code in \TEX\ engines (especially code that is not needed any longer).
-
-\startitemize[packed]
-    \startitem
-        Most of \PDFTEX\ version 1.40.9, converted to \CCODE. Some experimental
-        features have been removed and some utility macros are not inherited as
-        their functionality can be done in \LUA. The number of backend interface
-        commands has been reduced to a few. The extensions are separated from the
-        core (which we keep close to the original \TEX\ core). Some mechanisms
-        like expansion and protrusion can behave different from the original due
-        to some cleanup and optimization. Some whatsit based functionality (image
-        support and reusable content) is now core functionality.
-    \stopitem
-    \startitem
-        The direction model and some other bits from \ALEPH\ RC4 (derived from
-        \OMEGA) is included. The related primitives are part of core \LUATEX\ but
-        at the node level directional support is no longer based on so called
-        whatsits but on real nodes. In fact, whatsits are now only used for
-        backend specific extensions.
-    \stopitem
-    \startitem
-        Neither \ALEPH's I/O translation processes, nor tcx files, nor \ENCTEX\
-        can be used, these encoding|-|related functions are superseded by a
-        \LUA|-|based solution (reader callbacks). In a similar fashion all file
-        \IO\ can be intercepted.
-    \stopitem
-    \startitem
-        We currently use \LUA\ 5.2.*. At some point we might decide to move to
-        5.3.* but that is yet to be decided. There are few \LUA\ libraries that
-        we consider part of the core \LUA\ machinery, for instance \type {lpeg}.
-        There are additional \LUA\ libraries that interface to the internals of
-        \TEX.
-    \stopitem
-    \startitem
-        There are various \TEX\ extensions but only those that cannot be done
-        using the \LUA\ interfaces. The math machinery often has two code paths:
-        one traditional and the other more suitable for wide \OPENTYPE\ fonts.
-    \stopitem
-    \startitem
-        The fontloader uses parts of \FONTFORGE\ 2008.11.17 combined with
-        additional code specific for usage in a \TEX\ engine. We try to minimize
-        specific font support to what \TEX\ needs: character references and
-        dimensions and delegate everything else to \LUA. That way we keep \TEX\
-        open for extensions without touching the core.
-    \stopitem
-    \startitem
-        The \METAPOST\ library is integral part of \LUATEX. This gives \TEX\ some
-        graphical capabilities using a relative high speed graphical subsystem.
-        Again \LUA\ is used as glue between the frontend and backend. Further
-        development of \METAPOST\ is closely related to \LUATEX.
-    \stopitem
-\stopitemize
-
-The \TEXLIVE\ version is to be considered the current stable version. Any version
-between the yearly \TEXLIVE\ releases are to be considered beta. The beta
-releases are normally available via the \CONTEXT\ distribution channels (the
-garden and so called minimals).
-
-\blank[1*big]
-
-Hans Hagen, Harmut Henkel, \crlf
-Taco Hoekwater \& Luigi Scarso
-
-\blank[3*big]
-
-\starttabulate
-\NC Version  \EQ \currentdate \NC \NR
-\NC \LUATEX  \EQ Snapshot \number\luatexversion.\luatexrevision \NC \NR
-\NC \CONTEXT \EQ \contextversion \NC \NR
-\stoptabulate
-
-\stopchapter
-
-\stopcomponent