LaTeX support for texnansi encoding (LY1)

Installing

Ordinarily, you don't have to do anything, since this package is likely already present in your TeX distribution (TeX Live, MiKTeX).

But if you're on your own, then just recursively copy the directories here to your texmf-local (or some) tree, preserving structure. Then add the map files 8y.map to your dvips setup and/or update the configuration of other DVI drivers correspondingly. You will have to adjust URW vs. Adobe names as needed. (In TeX Live, this is already done in dvips35.map, etc., in conjunction with updmap, and the 8y.map files here are not used.)

Usage

The font encoding LY1 corresponds to the texnansi encoding originally used in the Y&Y TeX system. There is also an option to support the ansinew encoding that is the default encoding in Microsoft Windows.

The main file is ly1enc.def. This contains the declaration of the encoding. To use texnansi encoded fonts within LaTeX, typically you just need to add the line

\usepackage[LY1]{fontenc}

to your document preamble.

An alternative to the above line is to use the texnansi package

\usepackage{texnansi}

This will call the fontenc package, as above, to set up the LY1 encoding but then make further changes to the uppercase and lowercase tables. Note that LaTeX does not need these changes to correctly uppercase text as its MakeUppercase and MakeLowercase commands only require the uppercase and lower case codes of the letters a-z.

So for most purposes it is better to use the call to fontenc rather than use the texnansi' package. Then, if you pass thefile to a site using T1 (Cork) encoded fonts the line can more easily be changed to

\usepackage[T1]{fontenc}

The texnansi package has a package option ansinew which modifies the LY1 encoding to refer to that MS Windows encoding. However you should only do this if your TeX system can not reencode fonts to support T1 or LY1. The ansinew treatment of the left quote as a grave accent makes itrather unsuitable for TeX use. It also lacks several useful glyphs. However if you need to, you can do:

\usepackage[ansinew]{texnansi}

The other possible reason for using the texnansi package relates to the use of the lowercase table in the hyphenation algorithm. This is described below, but it is unfortunately of necessity rather technical, and you may want to stop reading at that point.

LY1 matches OT1 well enough that you can usually use it in that role also. You can \input texnansi if you want this to work exactly even in plain TeX.

Having declared the LY1 encoding to LaTeX, LaTeX will need to know the fonts that are available in this encoding. This distribution includes TeX metrics, font definition files and map files for the common "Standard PostScript" fonts.

For each encoding LaTeX needs to know an error font which is its fall back in the case that the font substitution system can find nothing better to do. ly1enc.def specifies that the Error Font for LY1 is Adobe Times-Roman. Any PostScript interpreter must be able to provide Times-Roman, so it seems a good choice as the error font. Yet you may wish to change this for any reason; just edit the lines

\DeclareErrorFont{LY1}{ptm}{m}{n}{10}
\DeclareFontSubstitution{LY1}{ptm}{m}{n}

at the top of ly1enc.def to refer to some other font set. For example if you have Y&Y TeX's "Lucida Bright" distribution you could change the two occurrences of {ptm} to {hlh} to make LaTeX fall back on Lucida Bright if all else fails. Please follow the LPPL and do not capriciously alter ly1enc.def in other ways.

For more information on LY1 encoding and see Y&Y's WWW page:

    <http://www.tug.org/yandy/usely1.htm>
    

A Note on Lowercase Codes and Hyphenation Tables

The lowercase table is used by TeX's hyphenation algorithm, so in principle one would need to change the lowercase table to match the encoding used. However, it should not be changed mid paragraph as all words, whatever font encoding they are set in, are lowercased using the table current at the end of the paragraph before being checked for hyphenation. Because of these limitations in TeX's hyphenation algorithm, LaTeX does not support changing the lowercase table mid document, so if the texnansi package is used then the texnansi lowercase table will be used for all fonts (whether or not LY1 encoded) and conversely if it is not used, the T1 table will be used, even for LY1 encoded fonts. The reason why this problem is not as serious as it may at first appear is that the majority of letters (as opposed to ligatures, and symbols) that occur in LY1 occur in the same place in T1.

The only letters that might possibly appear in a hyphenation table that are in different positions in T1 and LY1 are:

\oe  (low position OT1 high new)
\ss  (low position OT1 high new)
\v{s}
\v{z}
\l
\i   OT1  (although *composites* such as \'\i are in T1 position
           so this will only affect languages (Turkish?) that use
           an unaccented \i)
\"{y}

It should be noted that for those symbols that occur twice in LY1, the "high" copy is used if it coincides with the position used in T1 (as in the case of ae, o) otherwise the "low" copy will be used which will coincide with the OT1 position (oe, ss). (Unless the setup for ansinew is enabled in which case the high position is always used.)

Fortunately most hyphenation files for Western European languages (I checked French, German and Danish) duplicate all the hyphenation patterns using these letters so that the tables work with both T1 and OT1 (and hence LY1) encoded fonts. However if you are using a language that makes use of say, ss, but the hyphenation patterns just refer to ss as ^^ff then you will need to copy the hyphenation file and edit all occurrences of ^^ff to refer to the new position; either ^^19 (for texnansi) or ^^df (for ansinew).

The remaining letters that are in different positions, such as s caron, may be dealt with similarly, although they are mainly used in Eastern European languages. The LY1 encoding does not have as many glyphs for Eastern European languages as T1, so for those languages most likely this encoding is not suitable. (Of course TeX can produce all the accented letters required, but the hyphenation algorithm can not work with such constructed composites it can only work with composite letters that actually occur in the font.)

It would be a good thing if hyphenation tables did not refer to any explicit character positions using the ^^ab notation, but rather always accessed characters by control sequences such as ss. This would allow the remapping to be done via inputting a file such as ly1enc.def rather than by editing the hyphenation file. However currently most of the publicly available hyphenation tables unfortunately do "hard wire" the T1 character codes in this way.

Copyright 1997 David Carlisle (Updated Feb. 2001 Walter Schmidt) (Updated Jun. 2010 Karl Berry) (Updated Oct. 2010 Karl Berry – Times small caps faked as intended.) (Updated Jan. 2011 Karl Berry – missing map entries for ptmrr8ye and ptmr8yn. – irrelevant {phvl,psyr,pzdr}.tfm removed. – relevant ptm{b,r}c8y.vf included, and corresponding ptm{b,r}c8y.tfm. Thanks to Bruno Voisin for much research and debugging. ) (Updated June 2022 David Carlisle )

All the files in this directory may be redistributed and/or modified under the terms of the LaTeX Project Public License http://www.latex-project.org/lppl/ either version 1 of the License, or (at your option) any later version.