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authorNorbert Preining <norbert@preining.info>2021-04-20 03:00:55 +0000
committerNorbert Preining <norbert@preining.info>2021-04-20 03:00:55 +0000
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tree6829c46d8881891365b9be3fb660dba3ca79e6f5 /macros/luatex/optex/base/parameters.opm
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-%% This is part of the OpTeX project, see http://petr.olsak.net/optex
-
-\_codedecl \normalbaselineskip {Parameter settings <2020-03-17>} % preloaded in format
-
- \_doc -----------------------------
- \secc Primitive registers
- The primitive registers with the same default value as in plain \TeX/ follow:
- \_cod -----------------------------
-
-\_parindent=20pt % indentation of paragraphs
-\_pretolerance=100 % parameters used in paragraph breaking algorithm
-\_tolerance=200
-\_hbadness=1000
-\_vbadness=1000
-\_doublehyphendemerits=10000
-\_finalhyphendemerits=5000
-\_adjdemerits=10000
-\_uchyph=1
-\_defaulthyphenchar=`\-
-\_defaultskewchar=-1
-\_hfuzz=0.1pt
-\_vfuzz=0.1pt
-\_overfullrule=5pt
-\_linepenalty=10 % penalty between lines inside the paragraph
-\_hyphenpenalty=50 % when a word is bro-ken
-\_exhyphenpenalty=50 % when the hyphenmark is used explicitly
-\_binoppenalty=700 % between binary operators in math
-\_relpenalty=500 % between relations in math
-\_brokenpenalty=100 % after lines if they end by a broken word.
-\_displaywidowpenalty=50 % before last line of paragraph if display math follows
-\_predisplaypenalty=10000 % above display math
-\_postdisplaypenalty=0 % below display math
-\_delimiterfactor=901 % parameter for scaling delimiters
-\_delimitershortfall=5pt
-\_nulldelimiterspace=1.2pt
-\_scriptspace=0.5pt
-\_maxdepth=4pt
-\_splitmaxdepth=\_maxdimen
-\_boxmaxdepth=\_maxdimen
-\_parskip=0pt plus 1pt
-\_abovedisplayskip=12pt plus 3pt minus 9pt
-\_abovedisplayshortskip=0pt plus 3pt
-\_belowdisplayskip=12pt plus 3pt minus 9pt
-\_belowdisplayshortskip=7pt plus 3pt minus 4pt
-\_parfillskip=0pt plus 1fil
-\_thinmuskip=3mu
-\_medmuskip=4mu plus 2mu minus 4mu
-\_thickmuskip=5mu plus 5mu
-
- \_doc -----------------------------
- Note that `\topskip` and `\splittopskip` are changed when first
- `\typosize` sets the main values (default font size and default
- `\baselineskip`).
- \_cod -----------------------------
-
-\_topskip=10pt % top edge of page-box to first baseline distance
-\_splittopskip=10pt
-
- \_doc -----------------------------
- \secc Plain \TeX/ registers
- Declared registers used in plain \TeX/
- \_cod -----------------------------
-
-% We also define special registers that function like parameters:
-\_newskip\_smallskipamount \_smallskipamount=3pt plus 1pt minus 1pt
-\_newskip\_medskipamount \_medskipamount=6pt plus 2pt minus 2pt
-\_newskip\_bigskipamount \_bigskipamount=12pt plus 4pt minus 4pt
-\_newskip\_normalbaselineskip \_normalbaselineskip=12pt
-\_newskip\_normallineskip \_normallineskip=1pt
-\_newdimen\_normallineskiplimit \_normallineskiplimit=0pt
-\_newdimen\_jot \_jot=3pt
-\_newcount\_interdisplaylinepenalty \_interdisplaylinepenalty=100
-\_newcount\_interfootnotelinepenalty \_interfootnotelinepenalty=100
-
-\_def\_normalbaselines{\_lineskip=\_normallineskip
- \_baselineskip=\_normalbaselineskip \_lineskiplimit=\_normallineskiplimit}
-
-\_def\_frenchspacing{\_sfcode`\.=1000 \_sfcode`\?=1000 \_sfcode`\!=1000
- \_sfcode`\:=1000 \_sfcode`\;=1000 \_sfcode`\,=1000 }
-\_def\_nonfrenchspacing{\_sfcode`\.=3000 \_sfcode`\?=3000 \_sfcode`\!=3000
- \_sfcode`\:=2000 \_sfcode`\;=1500 \_sfcode`\,=1250 }
-
-\_public \normalbaselines \frenchspacing \nonfrenchspacing
- \smallskipamount \medskipamount \bigskipamount
- \normalbaselineskip \normallineskip \normallineskiplimit
- \jot \interdisplaylinepenalty \interfootnotelinepenalty ;
-
- \_doc -----------------------------
- \secc Different settings than in plain \TeX/
-
- Default \"baseline setting" is for 10\,pt fonts (like in plain \TeX/).
- But `\typosize` and `\typoscale` macros re-declare it if another font size is used.
-
- The \`\nonfrenchspacing` is not set by default because
- the author of \OpTeX/ is living in Europe.
- If you set `\enlang` hyphenation patterns then `\nonfrenchspacing`
- is set.
- \_cod -----------------------------
-
-\_normalbaselines % baseline setting, 10 pt font size
-
- \_doc -----------------------------
- Different values than in plain \TeX/ have the following primitive registers.
- We prohibit orphans, set more information for tracing boxes, set page origin
- to the upper left corner of the paper (no at 1\,in, 1\,in coordinates)
- and set default page dimensions as A4, no letter.
- \_cod -----------------------------
-
-\_emergencystretch=20pt % we want to use third pass of paragraph building algoritmh
- % we need not keep the compatibility with old documents
-
-\_clubpenalty=10000 % after first line of paragraph
-\_widowpenalty=10000 % before last line of paragraph
-
-\_showboxbreadth=150 % for tracing boxes
-\_showboxdepth=7
-\_errorcontextlines=15
-\_tracinglostchars=2 % missing chracter warnings on terminal too
-
-\_outputmode=1 % PDF ouput
-\_pdfvorigin=0pt % orgin is exatly at left upper corner
-\_pdfhorigin=0pt
-\_hoffset=25mm % margins are 2.5cm, no 1in
-\_voffset=25mm
-\_hsize=160mm % 210mm (from A4 size) - 2*25mm (default margins)
-\_vsize=244mm % 297mm (from A4 size) - 2*25mm (default margins) -3mm baseline correction
-\_pagewidth=210 true mm
-\_pageheight=297 true mm
-
- \_doc -----------------------------
- If you insist on plain \TeX/ values of these parameters then you can
- call the `\plaintexsetting` macro.
- \_cod -----------------------------
-
-\_def\_plaintexsetting{%
- \_emergencystretch=0pt
- \_clubpenalty=150
- \_widowpenalty=150
- \_pdfvorigin=1in
- \_pdfhorigin=1in
- \_hoffset=0pt
- \_voffset=0pt
- \_hsize=6.5in
- \_vsize=8.9in
- \_pagewidth=8.5 true in
- \_pageheight=11 true in
- \_nonfrenchspacing
-}
-\_public \plaintexsetting ;
-
- \_doc -----------------------------
- \secc[oparams] \OpTeX/ parameters
-
- The main principle of how to configure \OpTeX/ is not to use only parameters.
- A designer can copy macros from \OpTeX/ and re-define them as required.
- This is a reason why we don't implement dozens of parameters,
- but we keep \OpTeX/ macros relatively simple. Example: do you want
- another design of section titles? Copy macros `\_printsec` and
- `\_printsecc` from `sections.opm` file to your macro file and re-define them.
-
- Notice for OPmac users: there is an important difference: all "string-like"
- parameters are token lists in \OpTeX/ (OPmac uses macros for them). The reason of
- this difference: if a user sets parameter by unprefixed (public) control sequence,
- an \OpTeX/ macro can read {\em the same data} using a prefixed (private) control sequence.
-
- The \`\picdir` tokens list can include a directory where image files
- (loaded by `\inspic`) are saved. Empty `\picdir` (default value) means
- that image files are in the current directory (or somewhere in the \TeX/
- system where \LuaTeX/ can find them). If you set a non-empty value to
- the `\picdir`, then it must end by `/` character, for example
- `\picdir={img/}` means that there exists a directory `img` in your
- current directory and the image files are stored here.
- \_cod -----------------------------
-
-\_newtoks\_picdir
-\_public \picdir ;
-
- \_doc -----------------------------
- You can control the dimensions of included images by
- the parameters \`\picwidth` (which is equivalent to \`\picw`) and
- \`\picheight`. By default these parameters are set to zero: the native
- dimension of the image is used. If only `\picwidth` has a nonzero value,
- then this is the width of the image (height is calculated automatically in
- order to respect the aspect of the image). If only `\picheight` has
- a nonzero value then the height is given, the width is calculated. If both
- parameters are non-zero, the height and width are given and the aspect
- ratio of the image is (probably) broken. We recommend setting these
- parameters locally in the group where \^`\inspic` is used in order to not
- influence the dimensions of other images. But there exist many
- situations you need to put the same dimensions to more images,
- so you can set this parameter only once before more \^`\inspic` macros.
- \_cod -----------------------------
-
-\_newdimen\_picwidth \_picwidth=0pt \_let\picw=\_picwidth
-\_newdimen\_picheight \_picheight=0pt
-\_public \picwidth \picheight ;
-
- \_doc -----------------------------
- The \`\everytt` is the token list used in
- \^`\begtt`...\^`\endtt` environment and
- in the verbatim group opened by \^`\verbinput` macro. You can include a
- code which is processed inside the group after basic settings were done
- On the other hand, it is processed before the scanner of verbatim text is started.
- Your macros should influence scanner (catcode settings) or printing
- process of the verbatim code or both.
-
- The code from the line immediately after \^`\begtt` is processed after
- the \^`\everytt`. This code should overwrite \^`\everytt` settings. Use
- \^`\everytt` for all verbatim environments in your document and use a code
- after \^`\begtt` locally only for this environment.
-
- The \`\everyintt` token list does similar work
- but acts in the in-line verbatim
- text processed by a pair of \^`\verbchar` characters or by \^`\code``{<text>}`.
- You can set `\everyintt={\Red}` for example if you want in-line verbatim
- in red color.
- \_cod -----------------------------
-
-\_newtoks\_everytt
-\_newtoks\_everyintt
-\_public \everytt \everyintt ;
-
- \_doc -----------------------------
- The \`\ttline` is used
- in \^`\begtt`...\^`\endtt` environment or in the code
- printed by \^`\verbinput`. If `\ttline` is positive or zero, then the
- verbatim code has numbered lines from `\ttline+1`. The `\ttline`
- register is re-set to a new value after a code piece is printed, so next
- code pieces have numbered lines continuously. If `\ttline=-1`, then
- \^`\begtt`...\^`\endtt` lines are without numbers and \^`\verbinput` lines
- show the line numbers of inputted file. If `\ttline`\code{<-1}
- then no line numbers are printed.
- \_cod -----------------------------
-
-\_newcount\_ttline \_ttline=-1 % last line number in \begtt...\endtt
-\_public \ttline ;
-
- \_doc -----------------------------
- The \`\ttindent` gives default indentation
- of verbatim lines printed by \^`\begtt`...\^`\endtt` pair or by
- \^`\verbinput`.
- \nl
- The \`\ttshift` gives the amount of shift of all verbatim lines to the right.
- Despite the \^`\ttindent`, it does not shift the line numbers, only
- the text.
- \nl
- The \`\iindent` gives default indentations used in the table of contents,
- captions, lists, bib references,
- \nl
- It is strongly recommended to re-set this value if you set `\parindent`
- to another value than plain \TeX/ default 20pt. A well-typeset
- document should have the same dimension for all indentations, so
- you should say `\ttindent=\parindent` and `\iindent=\parindent`.
- \_cod -----------------------------
-
-\_newdimen\_ttindent \_ttindent=\_parindent % indentation in verbatim
-\_newdimen\_ttshift
-\_newdimen\_iindent \_iindent=\_parindent
-\_public \ttindent \ttshift \iindent ;
-
- \_doc -----------------------------
- The tabulator `^^I` has its category code like space: it behaves as a
- space in normal text. This is a common plain \TeX/ setting.
- But in the multiline verbatim environment it
- is active and expands to the `\hskip<dimen>` where `<dimen>`
- is the width of \`\tabspaces` spaces.
- Default `\tabspaces=3` means
- that tabulator behaves like three spaces in multiline verbatim.
- \_cod -----------------------------
-
-\_newcount \_tabspaces \_tabspaces=3
-\_public \tabspaces ;
-
- \_doc -----------------------------
- If \`\hicolors` is non-empty then its contents is used instead
- `\_hicolors<name>` declared in the file `hisyntax-<name>.opm`.
- The user can give his/her preferences about colors for
- syntax highlighting by this tokens list.
- The full color set must be declared here.
- \_cod -----------------------------
-
-\_newtoks\_hicolors
-\_public \hicolors ;
-
- \_doc -----------------------------
- The default item mark used between \^`\begitems` and \^`\enditems` is the bullet.
- The \`\defaultitem` tokens list declares this default item mark.
- \nl
- The \`\everyitem` tokens list is applied in vertical mode
- at the start of each item.
- \nl
- The \`\everylist` tokens list is applied after the group is opened by \^`\begitems`
- \nl
- The \`\ilevel` keeps the value of the current nesting level of the items list.
- \nl
- The \`\listskipamount` gives vertical skip above and below the items list
- if `\ilevel=1`.
- \_cod -----------------------------
-
-\_newtoks\_defaultitem \_defaultitem={$\_bullet$\_enspace}
-\_newtoks\_everyitem
-\_newtoks\_everylist
-\_newskip \_listskipamount \_listskipamount=\_medskipamount
-\_newcount \_ilevel
-\_public \defaultitem \everyitem \everylist \listskipamount \ilevel ;
-
- \_doc -----------------------------
- The \^`\tit` macro includes `\vglue`\`\titskip` above the title of the document.
- \_cod -----------------------------
-
-\_newskip\_titskip \_titskip=40pt \_relax % \vglue above title printed by \tit
-\_public \titskip ;
-
- \_doc ----------------------------
- The \^`\begmulti` and \^`\endmulti` pair creates more columns. The parameter
- \`\colsep` declares the space between columns. If $n$ columns are specified
- then we have $n-1$ `\colseps` and $n$ columns in total `\hsize`. This
- gives the definite result of the width of the columns.
- \_cod ----------------------------
-
-\_newdimen\_colsep \_colsep=20pt % space between columns
-\_public \colsep ;
-
- \_doc -----------------------------
- Each line in the Table of contents is printed in a group.
- The \`\everytocline` tokens list is processed here before
- the internal `\_tocl:<num>` macro which starts printing the line.
- \_cod -----------------------------
-
-\_newtoks \_everytocline
-\_public \everytocline ;
-
- \_doc -----------------------------
- The \`\bibtexhook` tokens list is used inside the group when `\usebib` command is
- processed after style file is loaded and before printing bib-entries.
- You can re-define a behavior of the style file here or you can modify the
- more declaration for printing (fonts, baselineskip, etc.) or you can
- define specific macros used in your `.bib` file.
- \_cod -----------------------------
-
-\_newtoks\_bibtexhook
-\_public \bibtexhook ;
-
- \_doc -----------------------------
- \`\everycapitonf` is used before printing caption in figures and
- \`\everycapitont` is used before printing caption in tables.
- \_cod -----------------------------
-
-\_newtoks\_everycaptiont \_newtoks\_everycaptionf
-\_public \everycaptiont \everycaptionf ;
-
- \_doc -----------------------------
- The \`\everyii` tokens list is used before `\noindent` for each
- Index item when printing the Index.
- \_cod -----------------------------
-
-\_newtoks\_everyii
-\_public \everyii ;
-
- \_doc -----------------------------
- The \`\everymnote` is used in the \^`\mnote` group before `\noindent` which
- immediately precedes marginal note text.
- \nl
- The \`\mnotesize` is the horizontal size of the marginal notes.
- \nl
- The \`\mnoteindent` is horizontal space between body-text and marginal note.
- \_cod -----------------------------
-
-\_newtoks\_everymnote
-\_newdimen\_mnotesize \_mnotesize=20mm % the width of the mnote paragraph
-\_newdimen\_mnoteindent \_mnoteindent=10pt % ditance between mnote and text
-\_public \everymnote \mnotesize \mnoteindent ;
-
- \_doc -----------------------------
- The \^`\table` parameters follow. The \`\thistable` tokens list
- register should be used for giving an exception for only one `\table`
- which follows. It should change locally other parameters of the `\table`.
- It is reset to an empty list after the table is printed.
- \nl
- The \`\everytable` tokens list register is applied in every table.
- There is another difference between these two registers.
- The `\thistable` is used first, then strut and baselineskip settings are
- done, then `\everytable` is applied and then the table is printed.
- \nl
- \`\tabstrut` configures the height and depth of lines in the table.
- You can declare `\tabstrut={}`, then normal baselineskip is used in the
- table. This can be used when you don't use horizontal nor vertical
- lines in tables.
- \nl
- \`\tabiteml` is applied before each item,
- \`\tabitemr` is applied after each item of the table.
- \nl
- \`\tablinespace` is additional vertical space between horizontal rules
- and the lines of the table.
- \nl
- \`\hhkern` gives the space between horizontal lines if they are doubled and
- \`\vvkern` gives the space between such vertical lines.
- \nl
- \`\tabskipl` is `\tabskip` used before first column,
- \`\tabskipr` is `\tabskip` used after the last column.
- \nl
- \`\tsize` is virtual unit of the width of paragraph-like table items when
- `\table pxto<size>` is used.
- \_cod -----------------------------
-
-\_newtoks\_everytable \_newtoks\_thistable
-\_newtoks\_tabiteml \_newtoks\_tabitemr \_newtoks\_tabstrut
-\_newdimen\_tablinespace \_newdimen\_vvkern \_newdimen\_hhkern \_newdimen\_tsize
-\_newskip\_tabskipl \_newskip\_tabskipr
-\_everytable={} % code used after settings in \vbox before table processing
-\_thistable={} % code used when \vbox starts, is is removed after using it
-\_tabstrut={\_strut}
-\_tabiteml={\_enspace} % left material in each column
-\_tabitemr={\_enspace} % right material in each column
-\_tablinespace=2pt % additional vertical space before/after horizontal rules
-\_vvkern=1pt % space between double vertical line and used in \frame
-\_hhkern=1pt % space between double horizontal line and used in \frame
-\_tabskipl=0pt\_relax % \tabskip used before first column
-\_tabskipr=0pt\_relax % \tabskip used after the last column
-\_public \everytable \thistable \tabiteml \tabitemr \tabstrut \tablinespace
- \vvkern \hhkern \tsize \tabskipl \tabskipr ;
-
- \_doc -----------------------------
- The \^`\eqalign` macro can be configured by \`\eqlines` and \`\eqstyle`
- tokens lists. The default values are set in order these macro beahaves
- as in Plain \TeX. The \`\eqspace` is horizontal space put
- between equation systems if more columns in \^`\eqalign` are used.
- \_cod -----------------------------
-
-\_newtoks \_eqlines \_eqlines={\_openup\_jot}
-\_newtoks \_eqstyle \_eqstyle={\_strut\_displaystyle}
-\_newdimen \_eqspace \_eqspace=20pt
-\_public \eqlines \eqstyle \eqspace ;
-
- \_doc -----------------------------
- \`\lmfil` is \"left matrix filler" (for `\matrix` columns). The default
- value does centering because the right matrix filler is directly set to `\hfil`.
- \_cod -----------------------------
-
-\_newtoks \_lmfil \_lmfil={\_hfil}
-\_public \lmfil ;
-
- \_doc -----------------------------
- The output routine uses token list \`\headline` and \`\footline` in the
- same sense as in plain \TeX/. If they are non-empty then `\hfil` or `\hss`
- must be here because they are used inside `\hbox to\hsize`.
-
- Assume that page-body text can be typeset in different sizes and
- different fonts and we don't know in what font context the output routine
- is invoked. So, it is strongly recommended to declare fixed variants of
- fonts at the beginning of your document. For example `\fontdef\rmfixed{\rm}`,
- `\fontdef\itfixed{\it}`. Then use them in headline and footline:
- \begtt
- \headline={\itfixed Text of headline, section: \fistmark \hss}
- \footline={\rmfixed \ifodd\pageno \hfill\fi \folio \hfil}
- \endtt
- \_cod -----------------------------
-
-\_newtoks\_headline \_headline={}
-\_newtoks\_footline \_footline={\_hss\_rmfixed \_folio \_hss}
-\_public \headline \footline ;
-
- \_doc -----------------------------
- The distance between the `\headline` and the top of the page text
- is controlled by the \`\headlinedist` register.
- The distance between the bottom of
- page-text and `\footline` is \`\footlinedist`.
- More precisely: baseline of
- headline and baseline of the first line in page-text have distance
- `\headlinedist+\topskip`. The baseline of the last line in page-text and
- the baseline of the footline have distance `\footlinedist`.
- Default values are inspired by plain \TeX/.
- \_cod -----------------------------
-
-\_newdimen \_headlinedist \_headlinedist=14pt
-\_newdimen \_footlinedist \_footlinedist=24pt
-\_public \headlinedist \footlinedist ;
-
- \_doc -----------------------------
- The \`\pgbottomskip` is inserted to the page bottom
- in the output routine. You can set less tolerance here than
- `\raggedbotom` does. By default, no tolerance is given.
- \_cod -----------------------------
-
-\_newskip \_pgbottomskip \_pgbottomskip=0pt \_relax
-\_public \pgbottomskip ;
-
- \_doc -----------------------------
- The \`\nextpages` tokens list can include settings which will be used at
- next pages. It is processed at the end of output routine with
- `\globaldefs=1` prefix. The `\nextpages` is reset to empty after
- processing. Example of usage:
- \begtt
- \headline={} \nexptages={\headline={\rmfixed \firstmark \hfil}}
- \endtt
- This example sets current page with empty headline, but next pages have
- non-empty headlines.
- \_cod -----------------------------
-
-\_newtoks \_nextpages
-\_public \nextpages ;
-
- \_doc -----------------------------
- The \`\pgbackground` token list can include macros which generate a
- vertical list. It is used as page background. The top-left corner of such
- `\vbox` is at the top-left corner of the paper. Example creates the
- background of all pages yellow:
- \begtt
- \pgbackground={\Yellow \hrule height 0pt depth\pdfpageheight width\pdfpagewidth}
- \endtt
- \_cod -----------------------------
-
-\_newtoks \_pgbackground \_pgbackground={} % for page background
-\_public \pgbackground ;
-
- \_doc -----------------------------
- The parameters used in \^`\inoval` and \^`\incircle` macros
- can be re-set by \`\ovalparams`, \`\circleparams` tokens lists.
- The default values (documented in the user manual) are set in the macros.
- \_cod -----------------------------
-
-\_newtoks \_ovalparams
-\_newtoks \_circleparams
-%\_ovalparams={\_roundness=2pt \_fcolor=\Yellow \_lcolor=\Red \_lwidth=.5bp
-% \_shadow=N \_overlapmargins=N \_hhkern=0pt \_vvkern=0pt }
-%\_circleparams={\_ratio=1 \_fcolor=\Yellow \_lcolor=\Red \_lwidth=.5bp
-% \_shadow=N \_overlapmargins=N \_hhkern=3pt \_vvkern=3pt}
-
-\_newdimen \_roundness \_roundness=5mm % used in \clippingoval macro
-
-\_public \ovalparams \circleparams \roundness ;
-
- \_doc -----------------------------
- \OpTeX/ defines \"Standard \OpTeX/ markup language"%
- \fnote{Will be developed in 2021.}
- which lists selected commands from chapter~1 and gives their behavior when a
- converter from \OpTeX/ document to HTML or Markdown or \LaTeX/ is used.
- The structure-oriented commands are selected here, but the commands which
- declare typographical appearance (page layout, dimensions, selected font
- family) are omitted. More information for such a converter should be
- given in \`\cnvinfo``{<data>}`.
- \OpTeX/ simply ignores this but the converter can read its configuration
- from here. For example, a user can write:
- \begtt \catcode`\<=13
- \cnvinfo {type=html, <cnv-to-html-data>}
- \cnvinfo {type=markdown, <cnv-to-markdown-data>}
- \endtt
- and the document can be processed by \OpTeX/ to create PDF, or by a
- converter to create HTML, or by another converter to create Markdown.
- \_cod -----------------------------
-
-\_let\cnvinfo=\_ignoreit
-
-
-\_endcode %----------------------------------------------------
-
-The behavior of document processing by \OpTeX/ is
-controlled by {\em parameters}. The parameters are
-\begitems
-* primitive registers used in build-in algorithms of \TeX/,
-* registers declared and used by \OpTeX/ macros.
-\enditems
-Both groups of registers have their type: number, dimension, skip, token
-list.
-
-The registers are represented by their names (control sequences). If the user
-re-defines this control sequence then the appropriate register exists
-steadily and build-in algorithms are using it without change. But user
-cannot access its value in this case. \OpTeX/ declares two control sequences
-for each register: prefixed (private) and unprefixed (public). \OpTeX/ macros use only
-prefixed variants of control sequences. The user should use the unprefixed variant
-with the same meaning and set or read the values of registers using the
-unprefixed variant. If the user re-defines the unprefixed control sequence of
-a register then \OpTeX/ macros still work without change.
-
-%There are only a few parameters declared by \OpTeX/ macros. All of them
-%are listed in this section. This is the desired feature of the \OpTeX/.
-%If you want to do more
-%changes which cannot be controlled by parameters listed here then you
-%can copy the appropriate \OpTeX/ macro to your macro file and you
-%can completely re-define it. The typical examples are `\_printsomething`
-%macros which declare the design of the document.
-
-\_endinput
-
-History:
-2020-04-04 ... \tabspaces added
-2020-04-03 ... \hicolors added