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% tone.sty -- TIPA optional package for displaying `tone letters'.
% Copyright 2002 FUKUI Rei
%
% This program may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.2
% of this license or (at your option) any later version.
% The latest version of this license is in
% http://www.latex-project.org/lppl.txt
% and version 1.2 or later is part of all distributions of LaTeX
% version 1999/12/01 or later.
%
% This program consists of all files listed in Manifest.txt.
%
% 1996/06/10 first version.
% 2001/11/07 \stone (for a short tone bar) added.
% 2001/12/32 \@tonestembar added (due to encoding change;
% \char'277 is now exclusively used for tone letter stem.
%
\RequirePackage{tipa}[2001/12/31 TIPA version 1.1]
\newif\if@longtone
\newdimen\@tonebarhtunit
\newdimen\@tonebarhalfwd
\newcommand\@tonestembar{\tipaencoding\char'277}
\newcommand\tone[1]{\@inittone\leavevmode
\hbox{\kern\@sidegap\@tone#1\relax\kern-\@tonebarhalfwd{\@tonestembar}}}
\newcommand\rtone[1]{\@inittone\leavevmode
\hbox{{\@tonestembar}\kern-\@tonebarhalfwd\@tone#1\relax\kern\@sidegap}}
\newcommand\stone[1]{\@inittone\@longtonefalse\leavevmode
\hbox{\kern\@sidegap\@tone#1\relax\kern-\@tonebarhalfwd{\@tonestembar}}}
\newcommand\@tone[1]{%
\ifx#1\relax
\ifx\pr@vpr@vtone\relax \@outputtone\pr@vtone\pr@vtone
\else \@outputtone\pr@vpr@vtone\pr@vtone\fi
\let\next\relax
\else
\ifx\pr@vpr@vtone\relax\else
\@longtonefalse\@outputtone\pr@vpr@vtone\pr@vtone\fi
\let\pr@vpr@vtone\pr@vtone\def\pr@vtone{#1}%
\let\next\@tone \fi
\next}
\newcommand\@outputtone[2]{{%
\count\z@ #1\advance\count\z@ -#2\def\@mintone{#2}%
\ifnum\count\z@>0\count\@ne128\advance\count\@ne \count\z@
\edef\@tonecode{\the\count\@ne}% falling tone
\else
\ifnum\count\z@<0\count\@ne132\advance\count\@ne -\count\z@
\edef\@tonecode{\the\count\@ne}\def\@mintone{#1}% rising tone
\else
\def\@tonecode{128}\fi\fi % level tone
\if@longtone\else\count\z@\@tonecode
\advance\count\z@ 9 \def\@tonecode{\the\count\z@}\fi
\@longtonefalse
\count\@ne\@mintone \advance\count\@ne \m@ne
\dimen\z@\the\count\@ne\@tonebarhtunit
\raise\dimen\z@\hbox{%
\@accshift{-\dimen\z@}%
{\tipaencoding\char\@tonecode}%
\@accshift{\dimen\z@}}}}
\newcommand\@toneshift[1]{\dimen\@ne#1}
\newcommand\@inittone{%
\@getaccshift \let\c@lcshift\@toneshift
\let\pr@vtone\relax\let\pr@vpr@vtone\relax
\@longtonetrue{\setbox\z@\hbox{\@tonestembar}%
\global\@tonebarhtunit.25\ht\z@
\global\@tonebarhalfwd.5\wd\z@}}
\endinput
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