From e0c6872cf40896c7be36b11dcc744620f10adf1d Mon Sep 17 00:00:00 2001
From: Norbert Preining <norbert@preining.info>
Date: Mon, 2 Sep 2019 13:46:59 +0900
Subject: Initial commit

---
 macros/latex/contrib/fancynum/fancynum.dtx | 312 +++++++++++++++++++++++++++++
 1 file changed, 312 insertions(+)
 create mode 100644 macros/latex/contrib/fancynum/fancynum.dtx

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diff --git a/macros/latex/contrib/fancynum/fancynum.dtx b/macros/latex/contrib/fancynum/fancynum.dtx
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+%
+% \iffalse
+%
+%% fancynum.dtx Copyright (C) J.J.Green 1999, 2000. 
+%% $Id: fancynum.dtx,v 1.8 2000/08/08 22:28:38 jjg Exp $
+%% 
+%% This file is part of the fancynum package.
+%%
+%% It may be distributed under the terms of the LaTeX Project Public
+%% License, as described in lppl.txt in the base LaTeX distribution.
+%% Either version 1.0 or, at your option, any later version.
+%%
+%<*dtx>
+          \ProvidesFile{fancynum.dtx}
+%</dtx>
+%<package>\NeedsTeXFormat{LaTeX2e}[1995/12/01]
+%<package>\ProvidesPackage{fancynum}
+%<driver> \ProvidesFile{fancynum.sty}
+% \fi
+%         \ProvidesFile{fancynum.dtx}
+          [2000/08/08 0.92 Fancynum package]
+%
+% \iffalse
+%<*driver>
+\documentclass{ltxdoc}
+\newenvironment{option}[1]{\expandafter\macro\expandafter{%
+   \csname ds@#1\endcsname}}{\endmacro}
+\begin{document}
+ \DocInput{fancynum.dtx}
+\end{document}
+%</driver>
+% \fi
+%
+% \CheckSum{0}
+%
+% \GetFileInfo{fancynum.dtx}
+%
+% \title{The \textsf{fancynum} package\thanks{This file
+%        has version number \fileversion, last
+%        revised \filedate.}}
+% \author{J. J. Green}
+% \date{\filedate}
+% \maketitle%
+%
+% \changes{0.5}{2000/04/01}{Beta release}
+%
+% \def\star{{\ttfamily*}}
+% \makeatletter
+% \def\Describe@Macro#1{\endgroup
+%              \setbox0=\lastbox\llap{\PrintDescribeMacro{#1}}}%
+% \makeatother
+% \marginparsep0pt
+%
+% \section{Introduction}
+%
+% The fancynum package is designed to aid the typesetting of numbers,
+% particularly (but not exclusively) the ASCII representation of 
+% floating point numbers as written by computers.
+%
+% In the sequel we refer to the glyph used to separate the
+% integer and decimal parts of a decimal number as the 
+% \emph{decimal symbol}, and that used to group the
+% digits of the integer and decimal parts as the 
+% \emph{group symbol}.
+%
+% The author invites suggestions on improvements to the package.
+% In particular, any information on the typographic conventions
+% for setting numbers in different languages would be most
+% welcome.
+%
+% \section{Usage}
+%
+% The fancynum package is quite standard in its usage. After
+% including the package in the preamble,
+% the macro |\fnum| is available in mathematics mode. A call to
+% |$\fnum{3.141593e+05}$| will be set as $3{\cdot}141{,}593\times10^{5}$,
+% and so on. Further examples can be found in the file |examples.tex|
+% included in the distribution.
+%
+% The operation of the |\fnum| macro can be modified with 
+% the commands |\setfnumdsym|, |\setfnumgsym| and |\setfnummsym|,
+% which set the value of the decimal, group and multiplication
+% symbols, respectively.
+%
+%\section{Limitations}
+%
+% The |\fnum| has some limitations on the form of its
+% argument:
+% \begin{itemize}
+% \item A decimal must have at least one digit either
+%   side of the decimal symbol;
+% \item The optional exponential symbol must be |e|;
+% \item If the exponent must have at least one digit.
+% \end{itemize}
+% Consequently the strings |.312e20|, |312.e20|
+% and |3.142E20| are not acceptable arguments.
+% I hope to remove these restrictions at some point.
+% 
+% \section{Package Options}
+% The package supports a small number of options. The 
+% locale-specific options set default values for all of 
+% the typographic parameters. The \textbf{english} option
+% uses the centred dot as the decimal symbol and a comma 
+% as the group symbol.
+% The \textbf{french} option uses the comma as the decimal 
+% symbol and a lower dot as the group symbol. Compare
+% the English $3{\cdot}141{,}593$ against the French $3{,}141.593$.
+% If no local-specific option is specified then English will
+% be taken as the default.
+%
+% The remaining options give specific values over the 
+% typographic parameters, and override the locale-specific
+% options. 
+%
+% The \textbf{tight} and \textbf{loose} options specify
+% space around the $\times$ in the setting of numbers in 
+% exponential form. Compare the loose $2.3\times 10^{3}$ with 
+% the tight $2.3{\times}10^{3}$. This option is useful where space
+% is at a premium, or may be preferred for {\ae}sthetic reasons.
+%
+% The \textbf{commas}, \textbf{thinspaces} and  \textbf{plain} options
+% specify the group symbol to be used, respectively
+% |{,}|, |\,| and |\relax|.
+%
+% \section{Thanks}
+% I am grateful to Heiko Oberdiek, Norman Gray, Michael Downes
+% and Donald Arseneau for their assistance on |comp.text.tex|,
+% and to Jerzy Kucharczyk for providing a bug report.
+%
+% \section{Implementation}
+%
+%    \begin{macrocode}
+%<*package>
+%    \end{macrocode}
+%
+% \subsection{Typographic parameters}
+%
+% The decimal, group and multiplication symbols are stored in the
+% global variables |\fn@decimalsym| etc.
+% The following macros give access to the values used in the package.
+%    \begin{macrocode}
+\def\setfnumdsym#1{\gdef\fn@decimalsym{#1}}
+\def\setfnumgsym#1{\gdef\fn@groupsym{#1}}
+\def\setfnummsym#1{\gdef\fn@multsym{#1}}
+%    \end{macrocode}
+%
+% \subsection{Package options}
+%
+% The package options are simply calls the macro for the appropriate
+% parameter.
+%    \begin{macrocode}
+\DeclareOption{english}{\setfnumdsym{{\cdot}}\setfnumgsym{{,}}}
+\DeclareOption{french}{\setfnumdsym{{,}}\setfnumgsym{{.}}}
+\DeclareOption{tight}{\setfnummsym{{\times}}}
+\DeclareOption{loose}{\setfnummsym{\times}}
+\DeclareOption{commas}{\setfnumgsym{{,}}}
+\DeclareOption{thinspaces}{\setfnumgsym{\,}}
+\DeclareOption{plain}{\setfnumgsym{\relax}}
+%    \end{macrocode}
+% We set the default values before processing the options
+%    \begin{macrocode}
+\ExecuteOptions{english,loose}
+\ProcessOptions\relax
+%    \end{macrocode}
+%
+% \subsection{Utility macros}
+%
+% \begin{macro}{\fn@length}
+% Find the length of a string mod 3 (taken directly
+% from the example on p.~219 of the \TeX{}book). Here 
+% though, a call to |\fn@length| assigns the calculated 
+% value the (global) variable |\fn@strlen|.
+%    \begin{macrocode}
+\newcount\fn@strlen
+\def\fn@length#1{\fn@strlen=0 \fn@getlength#1\end}
+\def\fn@getlength#1{\ifx #1\end \let\next=\relax \else
+  \advance\fn@strlen by1
+  \ifnum\fn@strlen=3 \fn@strlen=0 \fi
+  \let\next=\fn@getlength\fi \next}
+%    \end{macrocode}
+%  \end{macro}
+%
+% \subsection{Typesetting}
+%
+% \subsubsection{The decimal}
+%
+% \begin{macro}{\fn@fracpunct}
+% Punctuate the fractional part of a decimal. An 
+% easy cyclic recursion.
+%    \begin{macrocode}
+\def\fn@fracpunct#1{\fn@fpa#1@ }
+\def\fn@fpa#1#2#3 {#1\if #2@ \else \fn@fpb#2#3 \fi}
+\def\fn@fpb#1#2#3 {#1\if #2@ \else \fn@fpc#2#3 \fi}
+\def\fn@fpc#1#2#3 {#1\if #2@ \else \fn@groupsym\fn@fpa#2#3 \fi}
+%    \end{macrocode}
+%  \end{macro}
+%
+% \begin{macro}{\fn@intpunct}
+% Punctuate the integer part of a decimal. This is not as 
+% easy as the fractional part since we need to know the length
+% before we start (no doubt there is a direct recursive method 
+% to do this, but I'm not clever enough to work it out).  
+%    \begin{macrocode}
+\def\fn@intpunct#1{\fn@ipa#1 }
+%    \end{macrocode}
+% The macro |\fn@ipa| prints the string's initial $\pm$ and passes 
+% on the rest of the string to the |\fn@ipb| macro. It might be 
+% worthwhile stripping the redundant `+' here, but I am minded not 
+% to do this since whether it is present is the choice of the user 
+% (unlike the redundancy in the sign of the exponent --- see below).
+%    \begin{macrocode}
+\def\fn@ipa#1#2 {%
+  \if +#1 +\fn@ipb#2 \else 
+  \if -#1 -\fn@ipb#2 \else
+  \fn@ipb#1#2 \fi \fi} 
+%    \end{macrocode}
+% The |\fn@ipab| macro finds the length (modulo 3) with |\fn@strlen| 
+% and calls the appropriate output macro.
+%    \begin{macrocode}
+\def\fn@ipb#1 {\fn@length{#1} 
+  \ifcase\fn@strlen
+  \fn@ipc#1 \or 
+  \fn@ipd#1 \or
+  \fn@ipe#1 \fi}
+%    \end{macrocode}
+% The |\fn@ip[cde]| macro prints the first couple of characters 
+% and then calls |\fn@ipf| which calls |\fn@fpa| (see above) to 
+% finish the job.
+%    \begin{macrocode}
+\def\fn@ipc#1#2#3#4 {#1#2#3\fn@ipf#4@ }
+\def\fn@ipd#1#2     {#1\fn@ipf#2@ }
+\def\fn@ipe#1#2#3   {#1#2\fn@ipf#3@ }
+\def\fn@ipf#1#2     {\if #1@ \else \fn@groupsym\fn@fpa#1#2 \fi}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\fn@decimal}
+% Set a proper decimal.
+% The pattern matching trick used here (and for the 
+% exponent) is due to a conversation between 
+% Heiko Oberdiek and Michael Downs on |comp.text.tex|. 
+% See the file |ctt.txt| included in the distribution for details. 
+%    \begin{macrocode}
+\def\fn@propdecimal#1#2{\fn@intpunct{#1}\fn@decimalsym\fn@fracpunct{#2}}
+\def\fn@impropdecimal#1#2{\fn@intpunct{#1}}
+\def\fn@decimalsplit#1.#2.#3#4#5{#4{#1}{#2}}
+\def\fn@decimal#1{\fn@decimalsplit#1..\fn@propdecimal\fn@impropdecimal\empty}
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{The exponent}
+%
+% \begin{macro}{\fn@signedint}
+% Set a signed exponent.
+% The C standard I/O library functions \textit{printf},
+% \textit{fprintf}, etc., as well as many Fortran compilers,
+% write a `+' in the  exponent if it is positive. 
+% Since this is superfluous, both typographically 
+% and mathematically, we remove it if we find it.
+%    \begin{macrocode}
+\def\fn@signedint#1#2 {%
+  \if +#1 
+    \fn@unsignedint#2\relax 
+  \else 
+    \if -#1 
+      -\fn@unsignedint#2\relax 
+    \else  
+       \fn@unsignedint#1#2\relax
+    \fi
+  \fi}
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\fn@unsignedint}
+% Set an unsigned exponent. Here we remove leading zeros. 
+%    \begin{macrocode}
+\def\fn@unsignedint#1#2{%
+  \ifx #2\relax \let\next=#1 
+  \else 
+    \ifx 0#1 \let\next=\fn@unsignedint 
+    \else
+    \let\next=#1
+    \fi 
+  \fi 
+  \next #2}
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{The general number}
+%
+% \begin{macro}{\fnum}
+% The setting of an floating point number.
+% Our processing is dependent on whether the argument contains
+% the letter `e'.
+%    \begin{macrocode}
+\def\fn@exp#1#2{\fn@decimal{#1}\fn@multsym10^{\fn@signedint#2 }}
+\def\fn@noexp#1#2{\fn@decimal{#1}}
+\def\fn@realsplit#1e#2e#3#4#5{#4{#1}{#2}}
+\def\fnum#1{\fn@realsplit#1ee\fn@exp\fn@noexp\empty}
+%    \end{macrocode}
+% \end{macro}
+%
+%    \begin{macrocode}
+%</package>
+%    \end{macrocode}
+%
+% \Finale
+
+
+
+
+
-- 
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