UKTeX Digest Friday, 14 Sep 1990
Volume 90 : Issue 31
Today's Topics:
Extended TeX Font Encoding Scheme - Latin; request for comments
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E d i t o r 's N o t e
This is a special TUG90 Cork edition of the digest, announcing
a proposed font encoding scheme. The next regular issue should
appear on Mon, 24th September.
--Ed.
------------------------------------------------------------
Subject: Extended TeX Font Encoding Scheme - Latin; request for comments
Reply-To: Norbert Schwarz <p920021@dbohub01.bitnet>
Date: Fri, 14 Sep 90 10:41:46 BST
From: David Osborne <cczdao@uk.ac.nott.clan>
At the TUG90 meeting in Cork, the font-encoding Birds-of-a-Feather
meeting devised the following encoding scheme for using all 256
glyphs supported by the 8-bit facilities in TeX 3.0.
This is currently a draft for which comments are sought:
please direct all correspondence to Norbert Schwarz
<p920021@dbohub01.bitnet>
The TeX file which follows should be typeset using the Plain format,
and uses no extended characters. It can be typeset using TeX 2.x
% This is the final definition of a 256 character code set for
% TeX prepared by the TEX-CHAR working group, discussed at
% the TeX conference at Cork.
%
% Cork, September 12, 1990
%
% -----------------------------------------------------------------------
%
%
\advance\voffset by -1.5truecm
\advance\vsize by 3truecm
%
\nopagenumbers
\leftline{\bf Extended \TeX\ Font Encoding Scheme --- Latin }
\medskip
\hrule height 1pt
\medskip
\medskip
\leftline{finished in Cork, September 12, 1990 (corrected a typo in
text)}
\bigskip
%
%
%
\newcount\m \newcount\n \newdimen\dim
\def\oct#1{\hbox{\rm\'{}\kern-.2em\it#1\/\kern.05em}} % octal constant
\def\hex#1{\hbox{\rm\H{}\tt#1}} % hexadecimal constant
\def\setdigs#1"#2{\gdef\h{#2}% \h=hex prefix; \0\1=corresponding octal
\m=\n \divide\m by 64 \xdef\0{\the\m}%
\multiply\m by-64 \advance\m by\n \divide\m by 8 \xdef\1{\the\m}}
\def\oddline{\cr
\noalign{\nointerlineskip}
\multispan{19}\hrulefill&
\setbox0=\hbox{\lower 2.3pt\hbox{\hex{\h x}}}\smash{\box0}\cr
\noalign{\nointerlineskip}}
\def\evenline{
\ifnum\n<256 \m=\n \divide\m 16 \chardef\next=\m
\expandafter\setdigs\meaning\next\fi
\ifnum\n=256 \let\next=\endchart\else\let\next=\morechart\fi
\next}
\def\morechart{\cr\noalign{\hrule\penalty5000}
\chartline \oddline \m=\1 \advance\m 1 \xdef\1{\the\m}
\chartline \evenline}
\def\chartline{&\oct{\0\1x}&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&\:&&}
\def\chartstrut{\lower4.5pt\vbox to14pt{}}
\def\table{$$\global\n=0
\halign to\hsize\bgroup
\chartstrut##\tabskip0pt plus10pt&
&\hfil##\hfil&\vrule##\cr
\lower6.5pt\null
&&&\oct0&&\oct1&&\oct2&&\oct3&&\oct4&&\oct5&&\oct6&&\oct7&\evenline}
\def\endchart{\cr\noalign{\hrule}
\raise11.5pt\null&&&\hex 8&&\hex 9&&\hex A&&\hex B&
&\hex C&&\hex D&&\hex E&&\hex F&\cr\egroup$$\par}
\def\:{\setbox0=\hbox{\csname ec\number\n\endcsname}%
\ifdim\ht0>7.5pt\reposition
\else\ifdim\dp0>2.5pt\reposition\fi\fi
\box0\global\advance\n 1 }
\def\reposition{\setbox0=\vbox{\kern2pt\box0}\dim=\dp0
\advance\dim 2pt \dp0=\dim}
\def\centerlargechars{
\def\reposition{\setbox0=\hbox{$\vcenter{\kern2pt\box0\kern2pt}$}}}
\font\minisan=cmss10
\font\san=cmss10 scaled \magstep1
\font\San=cmss10 scaled \magstep2
\def\eng{{\san r \hskip-6pt\j}}
\def\Eng{{\San r \hskip-7pt\j}}
\def\Thorn{{\San\lower4pt\hbox{l} \hskip-8.5pt\relax b}}
\def\thorn{{\san\lower3pt\hbox{l} \hskip-7pt\relax b}}
\def\eth{{\minisan \raise4pt\hbox{$\times$} \hskip-8.5pt\relax o}}
%
\def\ogonek#1{\setbox0=\hbox{`}\ooalign{%
\hidewidth\lower\ht0\copy0\hidewidth\crcr#1\crcr}}
\font\tenu=cmu10
\def\ec#1{\expandafter\def\csname ec\number\n\endcsname{#1}\advance\n by 1{}}
\n=0
%
%
% accents
%
% '000-'015
%
\ec{\`{}} \ec{\'{}} \ec{\^{}} \ec{\~{}}
\ec{\"{}} \ec{\H{}} \ec{\char23} \ec{\v{}}
%
\ec{\u{}} \ec{\={}} \ec{\.{}} \ec{\c{}}
\ec{\ogonek{\ }}
%
% quotation marks
%
% '016-'024
\ec{,} \ec{$\scriptstyle<$} \ec{$\scriptstyle>$} \ec{``} \ec{''}
\ec{,\hskip-1pt ,} \ec{$\scriptstyle\ll$} \ec{$\scriptstyle\gg$}
% dashes
\ec{--}\ec{---}
%
% compound word mark
%
\ec{{\tt<\san cwm\tt>}}
%
% a small 0, to extend % into 0/00 and 0/000
\ec{$_0$}
% dotless i and j
\ec{\i}\ec{\j}
% f ligatures
\ec{ff}\ec{fi}\ec{fl}\ec{ffi}\ec{ffl}
% visible space
\ec{{\tt\char32}}
% the ASCII character set
\ec{!}\ec{{\tt"}}\ec{\#}\ec{\$}\ec{\%}\ec{\&}\ec{'}
\ec{(}\ec{)}\ec{*}\ec{+}\ec{,}\ec{-}\ec{.}\ec{/}
\n=48
\ec{0}\ec{1}\ec{2}\ec{3}\ec{4}\ec{5}\ec{6}\ec{7}\ec{8}\ec{9}
\ec{:}\ec{;}\ec{$<$}\ec{=}\ec{$>$}\ec{?}
\n=64
\ec{@}
\ec{A}\ec{B}\ec{C}\ec{D}\ec{E}\ec{F}\ec{G}\ec{H}\ec{I}\ec{J}\ec{K}\ec{L}\ec{M}
\ec{N}\ec{O}\ec{P}\ec{Q}\ec{R}\ec{S}\ec{T}\ec{U}\ec{V}\ec{W}\ec{X}\ec{Y}\ec{Z}
\ec{\lbrack}
\ec{$\backslash$}
\ec{\rbrack}
\ec{{\tt\^{}}}
\ec{{\tt\char`\_}}
\n=96
\ec{`}
\ec{a}\ec{b}\ec{c}\ec{d}\ec{e}\ec{f}\ec{g}\ec{h}\ec{i}\ec{j}\ec{k}\ec{l}\ec{m}
\ec{n}\ec{o}\ec{p}\ec{q}\ec{r}\ec{s}\ec{t}\ec{u}\ec{v}\ec{w}\ec{x}\ec{y}\ec{z}
\ec{$\{$}
\ec{$|$}
\ec{$\}$}
\ec{{\tt\~{}}}
\n=127
% hyphenation character
\ec{{\sevenrm (hyph.char) }-}
%
% accented letters, mainly from ISO Latin 2 (8859/2), and some more
%
% '200-'237 uppercase
%
\ec{\u A} \ec{\ogonek{A}} \ec{\'C} \ec{\v C}
\ec{\v D} \ec{\v E} \ec{\ogonek{E}} \ec{\u G}
%
\ec{\'L} \ec{L\kern-2pt'} \ec{\L} \ec{\'N}
\ec{\v N} \ec{Eng/\Eng} \ec{\H O} \ec{\'R}
%
\ec{\v R} \ec{\'S} \ec{\v S} \ec{\c S}
\ec{\v T} \ec{\c T} \ec{\H U} \ec{\accent 23U}
%%
\ec{\"Y} \ec{\'Z} \ec{\v Z} \ec{\.Z}
\ec{IJ} \ec{\.I} \ec{d\llap{\raise0.7ex\hbox{--}}} \ec{\S}
%
% '240-'277
%
\ec{\u a} \ec{\ogonek{a}} \ec{\'c} \ec{\v c}
\ec{d\kern-1pt'} \ec{\v e} \ec{\ogonek{e}} \ec{\u g}
%
\ec{\'l} \ec{l\kern-1pt'} \ec{\l} \ec{\'n}
\ec{\v n} \ec{eng/\eng} \ec{\H o} \ec{\'r}
%
\ec{\v r} \ec{\'s} \ec{\v s} \ec{\c s}
\ec{t\kern-1pt'} \ec{\c t} \ec{\H u} \ec{\accent 23u}
%
\ec{\"y} \ec{\'z} \ec{\v z} \ec{\.z}
\ec{ij} \ec{!`} \ec{?`} \ec{{\tenu\$}}
%
% accented letters, mainly from ISO Latin 1
%
% '300-'337 uppercase characters
%
\ec{\`A} \ec{\'A} \ec{\^A} \ec{\~A}
\ec{\"A} \ec{\AA} \ec{\AE} \ec{\c C}
%
\ec{\`E} \ec{\'E} \ec{\^E} \ec{\"E}
\ec{\`I} \ec{\'I} \ec{\^I} \ec{\"I}
%
\ec{Eth/\rlap{\raise0.3ex\hbox{--}}D} \ec{\~N} \ec{\`O} \ec{\'O}
\ec{\^O} \ec{\~O} \ec{\"O} \ec{\OE}
%
\ec{\O} \ec{\`U} \ec{\'U} \ec{\^U}
\ec{\"U} \ec{\'Y} \ec{Thorn/\Thorn} \ec{SS}
%
% '340-'377 lowercase characters
%
\ec{\`a} \ec{\'a} \ec{\^a} \ec{\~a}
\ec{\"a} \ec{\aa} \ec{\ae} \ec{\c c}
%
\ec{\`e} \ec{\'e} \ec{\^e} \ec{\"e}
\ec{\`\i} \ec{\'\i} \ec{\^\i} \ec{\"\i}
%
\ec{eth/\eth} \ec{\~n} \ec{\`o} \ec{\'o}
\ec{\^o} \ec{\~o} \ec{\"o} \ec{\oe}
%
\ec{\o} \ec{\`u} \ec{\'u} \ec{\^u}
\ec{\"u} \ec{\'y} \ec{thorn/\thorn} \ec{\ss}
%
\table
\noindent{\bf A few words of explanation:}
\medskip
\noindent
\oct{000}--\oct{014} are accents. \oct{014} is an ogonek.
\oct{015}--\oct{024} are quotation marks.
\oct{030} is a small 0 to put after the per cent sign, to turn it into
a per thousand (\%$_0$) or per million (\%$_{00}$) sign.
\oct{027} ({\san cwm}) is a compound word mark
(a zero-width invisible character) used e.g.\ for avoiding ligatures.
\oct{040} is a visible space.
\oct{042} is a {\it straight} double quotation mark.
\noindent \oct{041}--\oct{176} is like the 7 bit ASCII code.
Some characters that --- at first glance --- appear duplicated as accent
characters usually have a different shape.
\noindent \oct{177} is the hyphen character (that may be different from
the dash (\oct{055})).
\oct{201}, \oct{206}, \oct{241}, and \oct{246} are A's and E's with
ogonek accents.
\medskip
\noindent The table has been sorted to reflect {\tt\string\uppercase}
{\tt\string\lowercase} mechanism for all characters.
\medskip
\noindent This table shows the character codes positions, but the
shapes are only approximations.
\bye
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