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diff --git a/Master/texmf-dist/doc/context/sources/general/manuals/luatex/luatex-preamble.tex b/Master/texmf-dist/doc/context/sources/general/manuals/luatex/luatex-preamble.tex deleted file mode 100644 index 8293179776d..00000000000 --- a/Master/texmf-dist/doc/context/sources/general/manuals/luatex/luatex-preamble.tex +++ /dev/null @@ -1,110 +0,0 @@ -% language=uk - -\environment luatex-style - -\startcomponent luatex-preamble - -\startchapter[reference=preamble,title={Preamble}] - -\topicindex{nodes} -\topicindex{boxes} -\topicindex{\LUA} - -This is a reference manual, not a tutorial. This means that we discuss changes -relative to traditonal \TEX\ and also present new functionality. As a consequence -we will refer to concepts that we assume to be known or that might be explained -later. - -The average user doesn't need to know much about what is in this manual. For -instance fonts and languages are normally dealt with in the macro package that -you use. Messing around with node lists is also often not really needed at the -user level. If you do mess around, you'd better know what you're dealing with. -Reading \quotation {The \TEX\ Book} by Donald Knuth is a good investment of time -then also because it's good to know where it all started. A more summarizing -overview is given by \quotation {\TEX\ by Topic} by Victor Eijkhout. You might -want to peek in \quotation {The \ETEX\ manual} and documentation about \PDFTEX. - -But \unknown\ if you're here because of \LUA, then all you need to know is that -you can call it from within a run. The macro package that you use probably will -provide a few wrapper mechanisms but the basic \lpr {directlua} command that -does the job is: - -\starttyping -\directlua{tex.print("Hi there")} -\stoptyping - -You can put code between curly braces but if it's a lot you can also put it in a -file and load that file with the usual \LUA\ commands. - -If you still decide to read on, then it's good to know what nodes are, so we do a -quick introduction here. If you input this text: - -\starttyping -Hi There -\stoptyping - -eventually we will get a linked lists of nodes, which in \ASCII\ art looks like: - -\starttyping -H <=> i <=> [glue] <=> T <=> h <=> e <=> r <=> e -\stoptyping - -When we have a paragraph, we actually get something: - -\starttyping -[localpar] <=> H <=> i <=> [glue] <=> T <=> h <=> e <=> r <=> e <=> [glue] -\stoptyping - -Each character becomes a so called glyph node, a record with properties like the -current font, the character code and the current language. Spaces become glue -nodes. There are many node types that we will discuss later. Each node points -back to a previous node or next node, given that these exist. - -It's also good to know beforehand that \TEX\ is basically centered around -creating paragraphs and pages. The par builder takes a list and breaks it into -lines. We turn horizontal material into vertical. Lines are so called boxes and -can be separated by glue, penalties and more. The page builder accumulates lines -and when feasible triggers an output routine that will take the list so far. -Constructing the actual page is not part of \TEX\ but done using primitives that -permit manipulation of boxes. The result is handled back to \TEX\ and flushed to -a (often \PDF) file. - -The \LUATEX\ engine provides hooks for \LUA\ code at nearly every reasonable -point in the process: collecting content, hyphenating, applying font features, -breaking into lines, etc. This means that you can overload \TEX's natural -behaviour, which still is the benchmark. When we refer to \quote {callbacks} we -means these hooks. - -Where plain \TEX\ is basically a basic framework for writing a specific style, -macro packages like \CONTEXT\ and \LATEX\ provide the user a whole lot of -additional tools to make documents look good. They hide the dirty details of font -management, language demands, turning structure into typeset results, wrapping -pages, including images, and so on. You should be aware of the fact that when you -hook in your own code to manipulate lists, this can interfere with the macro -package that you use. - -When you read about nodes in the following chapters it's good to keep in mind their -commands that relate to then. Here are a few: - -\starttabulate[|l|l|p|] -\DB command \BC node \BC explanation \NC \NR -\TB -\NC \prm {hbox} \NC \nod {hlist} \NC horizontal box \NC \NR -\NC \prm {vbox} \NC \nod {vlist} \NC vertical box with the baseline at the bottom \NC \NR -\NC \prm {vtop} \NC \nod {vlist} \NC vertical box with the baseline at the top \NC \NR -\NC \prm {hskip} \NC \nod {glue} \NC horizontal skip with optional stretch and shrink \NC \NR -\NC \prm {vskip} \NC \nod {glue} \NC vertical skip with optional stretch and shrink \NC \NR -\NC \prm {kern} \NC \nod {kern} \NC horizontal or vertical fixed skip \NC \NR -\NC \prm {discretionary} \NC \nod {disc} \NC hyphenation point (pre, post, replace) \NC \NR -\NC \prm {char} \NC \nod {glyph} \NC a character \NC \NR -\NC \prm {hrule} \NC \nod {rule} \NC a horizontal rule \NC \NR -\NC \prm {vrule} \NC \nod {rule} \NC a vertical rule \NC \NR -\NC \prm {textdir(ection)} \NC \nod {dir} \NC a change in text direction \NC \NR -\LL -\stoptabulate - -For now this should be enough to enable you to understand the next chapters. - -\stopchapter - -\stopcomponent |