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%% This is part of OpTeX project, see http://petr.olsak.net/optex
\_codedecl \nopagenumbers {Output routine <2020-03-28>} % preloaded in format
\_doc -----------------------------
\`\_optexoutput` is default output routine. You can create another...
\_cod -----------------------------
\_output={\_optexoutput}
\_def \_optexoutput{\_begoutput \_shipout\_completepage \_endoutput}
\_doc -----------------------------
Default \`\_begoutput` and \`\_endoutput` is defined.
If you need another functionality implemented in the output routine, you can
\^`\addto``\_begoutput{...}` or \^`\addto``\_endoutput{...}`. The settings
here is local in the `\output` group.
The \`\_prepoffsets` can set `\hoffset` differently for left or right
page. It is re-defined by the \^`\margins` macro..
The \^`\_regmark` tokens list includes accumulated `#2` from the \^`\regmacro`.
Logos and another macros are re-defined here (locally) for their usage
in headlines or footlines.
\_cod -----------------------------
\_def \_begoutput{\_incr\_gpageno
\_immediate\_wref\_Xpage{{\the\gpageno}{\_folio}}%
\_prepoffsets \_the\_regmark} %
\_def \_endoutput{\_advancepageno
{\_globaldefs=1 \_the\_nextpages \_nextpages={}}%
\_ifnum\_outputpenalty>-20000 \_else\_dosupereject\_fi
}
\_def \_prepoffsets {}
\_doc -----------------------------
\`\gpageno` counts pages from one in whole document
\_cod -----------------------------
\_newcount\_gpageno
\_public \gpageno ;
\_doc -----------------------------
The \`\_completepage` is similar what plain \TeX/ does in its output routine.
New is only \`\_backgroundbox`. It is `\vbox` with zero height with its
contents (from \^`\pgbackground`) llaped down. It is shifted directly to the
left-upper corner of the paper.
The \`\_ensureblack` sets the typesetting of its parameter locally to `\Black`
color. We needn't do this if colors are never used in the document. So,
default value of the `\_ensureblack` macro is empty. But first usage of
color macros in the document re-defines `\_ensureblack`.
See the section~\ref[colors] for more details.
\_cod -----------------------------
\_def\_completepage{\_vbox{%
\_istoksempty \_pgbackground
\_iffalse \_ensureblack{\_backgroundbox{\_the\_pgbackground}}\_nointerlineskip \_fi
\_ensureblack{\_makeheadline}%
\_vbox to\_vsize {\_boxmaxdepth=\_maxdepth \_pagecontents}% \pagebody in plainTeX
\_ensureblack{\_makefootline}}%
}
\_def \_ensureblack #1{#1} % will be re-defined by color macros
\_let \_openfnotestack = \_relax % will be re-defined by color macros
\_def \_backgroundbox #1{\_moveleft\_hoffset\_vbox to0pt{\_kern-\voffset #1\_vss}}
\_doc -----------------------------
\`\_makeheadline` creates `\vbox to0pt` with its contents (the \^`\headline`)
shifted by \^`\headlinedist` up.
\_cod -----------------------------
\_def\_makeheadline {\_istoksempty \_headline \_iffalse
\_vbox to0pt{\_vss
\_baselineskip=\_headlinedist \_lineskiplimit=-\maxdimen
\_line{\_the\_headline}\_hbox{}}\_nointerlineskip
\_fi
}
\_doc -----------------------------
The \`\_makefootline` appends the \^`\footline` to the page-body box.
\_cod -----------------------------
\_def\_makefootline{\_istoksempty \_footline \_iffalse
\_baselineskip=\_footlinedist
\_lineskiplimit=-\maxdimen \_line{\_the\_footline}
\_fi
}
\_doc -----------------------------
The \`\_pagecontents` is similar as in plain \TeX/. The only differnece is
that the \`\_pagedest` is inserted at the top of `\_pagecontents` and
\^`\_ensureblack` is applied to the \^`\topins` and \^`\footins` material.\nl
The \`\_footnoterule` is defined here.
\_cod -----------------------------
\_def\_pagecontents{\_pagedest % destination of the page
\_ifvoid\_topins \_else \_ensureblack{\_unvbox\_topins}\_fi
\_dimen0=\dp255 \_unvbox255 % open up \box255
\_ifvoid\_footins \_else % footnote info is present
\_vskip\_skip\_footins
\_ensureblack{\_footnoterule \_openfnotestack \_unvbox\_footins}\fi
\kern-\_dimen0 \_vskip \_pgbottomskip
}
\_def \_pagedest {{\_def\_destheight{25pt}\_dest[pg:\_the\_gpageno]}}
\_def \_footnoterule {\kern-3pt \hrule width 2truein \kern 2.6pt }
\_doc -----------------------------
\`\pageno`, \`\folio`, \`\nopagenumbers`, \`\advancepageno`
and \`\normalbottom`
used in the context of the output routine
from plain \TeX/ is defined here.
Only the \`\raggedbottom` macro is defined differently. We use the
\^`\pgbottomskip` register here which is set to 0\,pt by default.
\_cod -----------------------------
\_countdef\_pageno=0 \_pageno=1 % first page is number 1
\_def \_folio {\_ifnum\_pageno<0 \_romannumeral-\_pageno \_else \_number\_pageno \_fi}
\_def \_nopagenumbers {\_footline={}}
\_def \_advancepageno {%
\_ifnum\_pageno<0 \_global\_advance\_pageno by-1 \_else \_incr\_pageno \_fi
} % increase |pageno|
\_def \_raggedbottom {\_topskip=\_dimexpr\_topskip plus60pt \_pgbottomskip=0pt plus1fil\_relax}
\_def \_normalbottom {\_topskip=\_dimexpr\_topskip \_pgbottomskip=0pt\_relax}
\_public \pageno \folio \nopagenumbers \advancepageno \raggedbottom \normalbottom ;
\_doc -----------------------------
Macros for footnotes are the same as in plain \TeX. There is only one
difference: \`\vfootnote` is implemented as \`\_opfootnote` with empty
parameter `#1`. This parameter should do a local settings inside
the \`\footins` group and it does it when `\fnote` macro is used.\nl
The `\_opfootnote` nor `\vfootnote` don't take the footnote text
as a parameter. This is due to user can do catcode settings (like inline
verbatim) in the footnote text. This idea is adapted from plain \TeX.\nl
The \`\footnote` and \`\footstrut` is defined as in plain \TeX/.
\_cod -----------------------------
\_newinsert\_footins
\_def \_footnote #1{\_let\_osf=\_empty % parameter #2 (the text) is read later
\_ifhmode \_edef\_osf{\_spacefactor\_the\_spacefactor}\/\_fi
#1\_osf\_vfootnote{#1}}
\_def\_vfootnote{\_opfootnote{}}
\_def \_opfootnote #1#2{\_insert\_footins\_bgroup
\_interlinepenalty=\_interfootnotelinepenalty
\_leftskip=0pt \_rightskip=0pt \_spaceskip=0pt \_xspaceskip=0pt \_relax
\_let\_colorstackcnt=\_fnotestack % special color stack for footnotes
#1\_relax % local settings used by \fnote macro
\_splittopskip=\_ht\_strutbox % top baseline for broken footnotes
\_splitmaxdepth=\_dp\_strutbox \_floatingpenalty=20000
\_textindent{#2}\_footstrut
\_isnextchar \_bgroup
{\_bgroup \_aftergroup\_vfootA \_afterassignment\_ignorespaces \_let\_next=}{\_vfootB}%
}
\_def\_vfootA{\_unskip\_strut\_isnextchar\_colorstackpop\_closefncolor\_vfootF}
\_def\_vfootB #1{#1\_uskip\_strut\_vfootF}
\_def\_vfootF{\_egroup} % close \_insert\_footins\_bgroup
\_def\_closefncolor#1{#1\_isnextchar\_colorstackpop\_closefncolor\_vfootF}
\_def \_footstrut {\_vbox to\_splittopskip{}}
\_skip\_footins=\_bigskipamount % space added when footnote is present
\_count\_footins=1000 % footnote magnification factor (1 to 1)
\_dimen\_footins=8in % maximum footnotes per page
\_public
\footins \footnote \vfootnote \footstrut ;
\_doc -----------------------------
The \`\topins` macros
\`\topinsert`, \`\midinsert`, \`\pageinsert`, \`\endinsert`
are the same as in plain \TeX/.
\_cod -----------------------------
\_newinsert\_topins
\_newifi\_ifupage \_newifi\_ifumid
\_def \_topinsert {\_umidfalse \_upagefalse \_oins}
\_def \_midinsert {\_umidtrue \_oins}
\_def \_pageinsert {\_umidfalse \_upagetrue \_oins}
\_skip\_topins=\_zoskip % no space added when a topinsert is present
\_count\_topins=1000 % magnification factor (1 to 1)
\_dimen\_topins=\_maxdimen % no limit per page
\_def \_oins {\_par \_begingroup\_setbox0=\_vbox\_bgroup} % start a \_vbox
\_def \_endinsert {\_par\_egroup % finish the \_vbox
\_ifumid \_dimen0=\_ht0 \_advance\_dimen0 by\_dp0 \_advance\_dimen0 by\_baselineskip
\_advance\_dimen0 by\_pagetotal \_advance\_dimen0 by-\_pageshrink
\_ifdim\_dimen0>\_pagegoal \_umidfalse \_upagefalse \_fi \_fi
\_ifumid \_bigskip \_box0 \_bigbreak
\_else \_insert \_topins {\_penalty100 % floating insertion
\_splittopskip=0pt
\_splitmaxdepth=\_maxdimen \_floatingpenalty=0
\_ifupage \_dimen0=\_dp0
\_vbox to\_vsize {\_unvbox0 \_kern-\_dimen0}% depth is zero
\_else \_box0 \_nobreak \_bigskip \_fi}\_fi\_endgroup}
\_public \topins \topinsert \midinsert \pageinsert \endinsert ;
\_doc -----------------------------
The \`\draft` macro is an example of usage `\_pgbackground` to create
water color marks.
\_cod -----------------------------
\_def \_draft {\_pgbackground={\_draftbox{\_draftfont DRAFT}}%
\_fontdef\_draftfont{\_setfontsize{at10pt}\_bf}%
\_global\_let\_draftfont=\_draftfont
}
\_def \_draftbox #1{\_setbox0=\_hbox{#1}%
\_kern.5\_vsize \_kern4.5\_wd0
\_hbox to0pt{\_kern.5\_hsize \_kern-1\_wd0
\_pdfsave \_pdfrotate{55}\_pdfscale{10}{10}%
\_hbox to0pt{\_localcolor\LightGrey \_box0\_hss}%
\_pdfrestore
\_hss}%
}
\_public \draft ;
\_endcode % -------------------------------------
The output routine \^`\_optexoutput` is similar as in plain \TeX. It does:
\begitems
* \^`\_begoutput` which does:
\begitems
* increments \^`\gpageno`,
* prints `\_Xpage{<gpageno>}{<pageno>}` to the `.ref` file
(if \^`\openref` is active),
* calculates `\hoffset`,
* sets local meaning of macros used in headlines/footlines (see \^`\regmacro`).
\enditems
* `\shipout`\^`\_completepage`, which is `\vbox` of --
\begitems
* backrground box, if \^`\pgbackground` is non-empty,
* headline box by \^`\_makeheadline`, if the \^`\headline` is nonempty,
* `\vbox to\vsize` of \^`\_pagecontents` which cosnists of --
\begitems
* \^`\_pagedest`, the page destination `pg:<gpageno>` for hyperlinks is created here,
* \^`\topins` box if non-empty (from \^`\topinsert`s),
* `\box255` with completed vertical material from main vertical mode,
* \^`\_footnoterule` and \^`\footins` box if nonempty (from \^`\fnote`, \^`\footnote`),
* \^`\pgbottomskip` (default is 0\,pt).
\enditems
* footline box by `\_makefootline`, if the \^`\footline` is nonempty
\enditems
* \^`\_endoutput` which does:
\begitems
* increments \^`\pageno` using \^`\advancepageno`
* runs output routine repeatedly if \^`\dosupereject` is activated.
\enditems
\enditems
|
