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author | Karl Berry <karl@freefriends.org> | 2016-10-07 22:24:58 +0000 |
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committer | Karl Berry <karl@freefriends.org> | 2016-10-07 22:24:58 +0000 |
commit | d30aa38d9b8e86cd7916fb2de8db58c73be41f03 (patch) | |
tree | 13d9be1a0d1399c554c2bcdc633cdf57f73027ff /Master/texmf-dist/source/latex | |
parent | a54d580a3fabbe9506227e953f7e31598ada525c (diff) |
spalign (7oct16)
git-svn-id: svn://tug.org/texlive/trunk@42225 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Master/texmf-dist/source/latex')
-rw-r--r-- | Master/texmf-dist/source/latex/spalign/spalign.dtx | 1211 | ||||
-rw-r--r-- | Master/texmf-dist/source/latex/spalign/spalign.ins | 55 |
2 files changed, 1266 insertions, 0 deletions
diff --git a/Master/texmf-dist/source/latex/spalign/spalign.dtx b/Master/texmf-dist/source/latex/spalign/spalign.dtx new file mode 100644 index 00000000000..c59e2246cbc --- /dev/null +++ b/Master/texmf-dist/source/latex/spalign/spalign.dtx @@ -0,0 +1,1211 @@ +% \iffalse meta-comment +% +% Copyright (C) 2016 by Joseph Rabinoff <rabinoff@math.gatech.edu> +% ------------------------------------------------------- +% +% This file may be distributed and/or modified under the +% conditions of the LaTeX Project Public License, either version 1.3 +% 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 1.3 or later is part of all distributions of LaTeX +% version 2005/12/01 or later. +% +% \fi +% +% \iffalse +%<*driver> +\ProvidesFile{spalign.dtx} +%</driver> +%<package>\NeedsTeXFormat{LaTeX2e}[2005/12/01] +%<package>\ProvidesPackage{spalign} +%<*package> + [2016/10/05 aligns delimited by spaces] +%</package> +% +%<*driver> +\documentclass{ltxdoc} +\usepackage{spalign}[2016/10/05] +\usepackage[charter,sfscaled,ttscaled,cal=cmcal]{mathdesign} +\usepackage{amsmath} + +\def\usage#1#2{\textbf{Usage:} \texttt{\string#1} #2\vadjust{\vskip 1ex}\\} + +\newdimen\poptskip\poptskip=1.3cm +\advance\poptskip by 1ex +\def\poption #1:{% + \hangindent=\poptskip\hangafter=1% + \noindent\hbox to 1.3cm{\hfil\bf#1:}\hskip 1ex% + } +\def\endopt{\par\vskip2pt} + +\let\tvs=\textvisiblespace + +\EnableCrossrefs +\CodelineIndex +\RecordChanges +\begin{document} + \DocInput{spalign.dtx} + \PrintChanges + \PrintIndex +\end{document} +%</driver> +% \fi +% +% \CharacterTable +% {Upper-case \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z +% Lower-case \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z +% Digits \0\1\2\3\4\5\6\7\8\9 +% Exclamation \! Double quote \" Hash (number) \# +% Dollar \$ Percent \% Ampersand \& +% Acute accent \' Left paren \( Right paren \) +% Asterisk \* Plus \+ Comma \, +% Minus \- Point \. Solidus \/ +% Colon \: Semicolon \; Less than \< +% Equals \= Greater than \> Question mark \? +% Commercial at \@ Left bracket \[ Backslash \\ +% Right bracket \] Circumflex \^ Underscore \_ +% Grave accent \` Left brace \{ Vertical bar \| +% Right brace \} Tilde \~} +% +% +% \changes{v1.0}{2016/10/05}{Initial version} +% +% \GetFileInfo{spalign.dtx} +% +% \DoNotIndex{\newcommand,\newenvironment} +% +% +% \title{The \textsf{spalign} package\thanks{This document +% corresponds to the version of \textsf{spalign} dated \filedate.}} +% \author{Joseph Rabinoff \\ \texttt{rabinoff@math.gatech.edu}} +% +% \maketitle +% +% \section{Introduction} +% +% The purpose of this package is to decrease the number of keystrokes needed to +% typeset small amounts of aligned material (matrices, arrays, etc.). For +% instance, it is inconvenient to type (using the \textsf{amsmath} package) +% \begin{verbatim} +% \[ \begin{matrix} +% 1 & 12 & -3 \\ +% 24 & -2 & 2 \\ +% 0 & 0 & 1 +% \end{matrix} \]\end{verbatim} +% in a document where several hundred such +% matrices must be typeset. Of course +% one can always define a macro |\mat| which puts its argument inside a +% |matrix| environment, but it is still necessary to type the align character +% |&| and the end-of-row control sequence |\\| many times for each matrix. +% +% This package provides a facility for typesetting matrices, and using other +% alignment environments and macros, with spaces as the +% alignment delimiter and semicolons (by default) as the end-of-row indicator. So +% the above matrix could be produced using the command: +% \begin{verbatim} +% \[ \spalignmat{1 12 -3; 24 -2 2; 0 0 1} \]\end{verbatim} +% This package also contains utility macros for typesetting augmented matrices, +% vectors, arrays, and more, and is easily extendable to other situations that use +% alignments. +% +% \section{Usage} +% +% In~\S\ref{sec:alignment} the simplified alignment format used by arguments to +% macros in this package is described. In~\S\ref{sec:utility} the utility +% macros provided by the \textsf{spalign} package are presented; these are the +% macros that most users will need. Section~\ref{sec:options} contains the +% package options. The macros designed to allow the user to adapt the +% \textsf{spalign} package to other situations are presented +% in~\S\ref{sec:general}. +% +% \subsection{Alignment format}\label{sec:alignment} +% The core functionality of the \textsf{spalign} package is to convert spaces to +% alignment characters `|&|' and semicolons to end-of-row control sequences +% `|\\|'. This process is called \textit{retokenization}. The retokenization +% procedure is designed to work more or less how one would expect. +% Retokenization of a string \meta{text} proceeds as follows. +% \begin{enumerate} +% \item Spaces at the beginning and end of \meta{text} are ignored, as are +% spaces at the beginning and end of a line, and spaces before and after a +% semicolon or a comma. +% \item Multiple spaces are combined into one space. +% \item Spaces between non-space characters are converted to |&| (really, to +% the contents of |\spalignaligntab|). +% \item Commas (really, the contents of |\spalignseparator|) are also converted to +% |&|. +% \item Semicolons (really, the contents of |\spalignendofrow|) are +% converted to |\\| (really, to the contents of |\spalignendline|). +% \item Text in braces |{...}| is treated as a unit: the contents are not +% retokenized, and the braces are preserved. +% \end{enumerate} +% These rules are best understood by example. +% +% \medskip\noindent\textbf{Example.} The command +% \begin{verbatim} +% \[ \spalignmat{ 1 +% -2 3 ; 4 +% 55 2^3; +% \frac{1 1}2 {1 +% 3} {1 0 1} } \]\end{verbatim} +% produces +% \[\spalignmat{ 1 +% -2 3 ; 4 +% 55 2^3 ; +% \frac{1 1}2 {1 +% 3} {1 0 1} }. +% \] +% +% \medskip\noindent\textbf{Example.} The command +% \begin{verbatim} +% \[ \spalignmat{ \cos\theta, \sin\theta; +% -\sin\theta, \cos\theta} \]\end{verbatim} +% produces +% \[\spalignmat{ \cos\theta, \sin\theta; +% -\sin\theta, \cos\theta}. +% \] +% Here the commas are necessary: \TeX\ will not tokenize spaces following a +% command sequence, so +% \begin{verbatim} +% \[ \spalignmat{ \cos\theta \sin\theta; +% -\sin\theta \cos\theta} \]\end{verbatim} +% produces the (presumably unexpected) result +% \[\spalignmat{ \cos\theta \sin\theta; +% -\sin\theta \cos\theta}. +% \] +% Instead of commas, one could also type, for instance, +% \begin{verbatim} +% \[ \spalignmat{ \cos\theta{} \sin\theta; +% -\sin{\theta} \cos\theta} \]\end{verbatim} +% +% \medskip\noindent\textbf{Example.} The fact that expressions between braces +% |{...}| are not retokenized allows for arbitrarily complex entries in +% \textsf{spalign} macros---although these macros are probably not terribly +% useful in such cases. The \textsf{spalign} macros can even be nested: for +% instance, +% \begin{verbatim} +% \[ \spalignmat{ \spalignmat{a b; c d} \spalignmat{a' b'; c' d'}; +% \spalignmat{d e; f g} \spalignmat{d' e'; f' g'} } \] \end{verbatim} +% produces +% \[ \spalignmat{ \spalignmat{a b; c d} \spalignmat{a' b'; c' d'}; +% \spalignmat{d e; f g} \spalignmat{d' e'; f' g'} }. \] +% +% +% \subsection{Utility macros}\label{sec:utility} +% Most math-mode utility macros use the |array| environment internally. This +% can be the vanilla \LaTeX\ |array| environment, or the one from the +% \textsf{array} package; it makes no difference. All math-mode utility macros +% have an un-starred version and a starred version. The un-starred version +% produces arrays with the delimiters defined by the package options +% (see~\ref{sec:options}), and the starred version omits the delimiters (and the +% glue between the delimiters and the array). +% +% As the only purpose of this package is to save keystrokes, the user may want +% to put +% \begin{verbatim} +% \let\mat=\spalignmat +% \let\amat=\spalignaugmat +% \let\vec=\spalignvector\end{verbatim} +% or something similar after |\usepackage{spalign}|. Note that |\mat*| will now +% also be synonymous with |\spalignmat*|, etc. +% +% \bigskip +% \noindent +% \DescribeMacro{\spalignarray} +% \DescribeMacro{\spalignarray*} +% \usage\spalignarray{\marg{alignment specifier}\marg{text}} +% Produces a (potentially delimited) |array| environment, passing it +% \meta{alignment specifier}, after retokenizing \meta{text}. This is exactly +% like the matrix environments below, except that it is possible to specify the +% alignment of each column separately, add vertical bars, etc. +% For example, +% \begin{verbatim} +% \[ \spalignarray{l|c|r}{1 1 1; 100 100 100} \]\end{verbatim} +% produces +% \[ \DeleteShortVerb{\|} +% \spalignarray{l|c|r}{1 1 1; 100 100 100}. +% \MakeShortVerb{\|} +% \] +% Note that |\spalignarray*| simply produces an |array| environment surrounding +% the retokenized \meta{text}. +% +% \bigskip +% \noindent +% \DescribeMacro{\spalignmat} +% \DescribeMacro{\spalignmat*} +% \usage\spalignmat{\oarg{column alignment}\marg{text}} +% Produces a matrix whose columns are aligned according to the +% \meta{column alignment}, after retokenizing \meta{text}. The \meta{column alignment} +% is an array environment alignment specifier for a single column (usually |l|, +% |c|, or |r|), which is used for each column. The default is |c|. For example, +% \begin{verbatim} +% \[ \spalignmat[l]{1 1 1; 100 100 100} \]\end{verbatim} +% produces +% \[ \spalignmat[l]{1 1 1; 100 100 100}. \] +% +% \bigskip +% \noindent +% \DescribeMacro{\spalignvector} +% \DescribeMacro{\spalignvector*} +% \usage\spalignvector{\oarg{column alignment}\marg{text}} +% Produces a matrix with one column. Spaces, commas, and semicolons are all +% retokenized to the end-of-row control sequence `|\\|'. The +% \meta{column alignment} is interpreted as in |\spalignmat|; the default is +% |c|. For example, +% \begin{verbatim} +% \[ \spalignvector[r]{1 100 1000} \]\end{verbatim} +% produces +% \[ \spalignvector[r]{1 100 1000}. \] +% +% \bigskip +% \noindent +% \DescribeMacro{\spalignaugmatn} +% \DescribeMacro{\spalignaugmatn*} +% \usage\spalignaugmatn{\oarg{column alignment}\marg{augmented columns}\marg{text}} +% Produces a matrix with a vertical divider located \meta{augmented columns} from the +% right side of the matrix. The \meta{column alignment} is interpreted as in +% |\spalignmat|; the default is |r|. For example, +% \begin{verbatim} +% \[ \spalignaugmatn[c]{3}{1 2 3 4; 10 20 30 40} \]\end{verbatim} +% produces +% \[ \spalignaugmatn[c]{3}{1 2 3 4; 10 20 30 40}. \] +% +% \bigskip +% \noindent +% \DescribeMacro{\spalignaugmat} +% \DescribeMacro{\spalignaugmat*} +% \usage\spalignaugmat{\oarg{column alignment}\marg{text}} +% This is the same as |\spalignaugmatn|, with \meta{augmented columns} equal to +% $1$. For example, +% \begin{verbatim} +% \[ \spalignaugmat{1 2 3 4; 10 20 30 40} \]\end{verbatim} +% produces +% \[ \spalignaugmat{1 2 3 4; 10 20 30 40}. \] +% +% \bigskip +% \noindent +% \DescribeMacro{\spalignaugmathalf} +% \DescribeMacro{\spalignaugmathalf*} +% \usage\spalignaugmathalf{\oarg{column alignment}\marg{text}} +% This is the same as |\spalignaugmatn|, with \meta{augmented columns} equal to +% the largest integer less or equal to half of the total number of columns +% parsed from \meta{text}. For example, +% \begin{verbatim} +% \[ \spalignaugmathalf[l]{1 2 3 4; 10 20 30 40} \]\end{verbatim} +% produces +% \[ \spalignaugmathalf[l]{1 2 3 4; 10 20 30 40}. \] +% +% \bigskip +% \noindent +% \DescribeMacro{\spalignsys} +% \DescribeMacro{\spalignsys*} +% \usage\spalignsys{\marg{text}} +% Typesets systems of simple equations so that binary operators and relations +% are aligned vertically, and variables are right-justified. This macro assumes +% that variables are in odd columns and that binary operators and relations are +% in even columns. For example, +% \begin{verbatim} +% \[ \spalignsys{2x + y = 4; x - 3y = -17} \]\end{verbatim} +% produces +% \[ \spalignsys{2x + y = 4; x - 3y = -17\rlap.} \] +% Within \marg{text} the macro |\+| is defined to be an empty box with the size +% and spacing of a binary operator, the macro |\=| is defined to be an empty box +% with the size and spacing of a relation, and the macro |\.| is defined to be +% empty. (Ordinarily, the latter two macros produce th\=ese acc\.ents, but they +% cannot be used in math mode.) This allows one to deal with empty columns in +% an easy-to-read way: for example, +% \begin{verbatim} +% \[ \spalignsys{ +% 2x \+ \. - 3z = 1; +% \. \+ 4y + z = -4} +% \]\end{verbatim} +% produces +% \[ \spalignsys{ +% 2x \+ \. - 3z = 1; +% \. \+ 4y + z = -4\rlap.} +% \] +% As with the matrix macros, delimiters can be changed with the package options. +% +% \bigskip +% \noindent +% \DescribeMacro{\spaligntabular} +% \usage\spaligntabular{\marg{alignment specifier}\marg{text}} +% Produces an (undelimited) |tabular| environment, passing it +% \meta{alignment specifier}, after retokenizing \meta{text}. This macro may be +% used outside of math mode, and therefore is undelimited. +% For example, +% \begin{verbatim} +% \spaligntabular{lrc}{a b c; aa bb cc}\end{verbatim} +% produces +% \[ \spaligntabular{lcr}{a b c; aa bb cc} \] +% +% \subsection{Package options}\label{sec:options} +% The following package options can be specified as key-value pairs when the +% package is loaded, as in +% \begin{verbatim} +% \usepackage[sep={,},endofrow=;]{spalign} \end{verbatim} +% They can also be set directly with macros, which are described as well. +% +% \bigskip +% \noindent +% \DescribeMacro{delims} +% \DescribeMacro{\spaligndelims} +% \poption Use: Specifies the delimiters used by all matrix macros.\endopt +% \poption Format: Must contain exactly two delimiter tokens, the first for the left +% delimiter, the second for the right.\endopt +% \poption Default: |delims=()|\endopt +% \poption Macro: |\spaligndelims|\marg{left-delim}\marg{right-delim}\endopt +% \smallskip +% It is easier to specify |\{\}| as delimiters using the macro form. +% For example, +% \begin{verbatim} +% \[ \spaligndelims\vert\vert \spalignmat{a b; c d} \]\end{verbatim} +% produces +% \[ \spaligndelims\vert\vert \spalignmat{a b; c d}. \] +% +% \bigskip +% \noindent +% \DescribeMacro{sysdelims} +% \DescribeMacro{\spalignsysdelims} +% These function the same way as |delims| and |\spaligndelims|, except they +% apply only to the |\spalignsys| macro. The default is |\spalignsysdelims\{.|, +% i.e., left brace and no right delimiter. +% +% \bigskip +% \noindent +% \DescribeMacro{matdelimskip} +% \DescribeMacro{\spalignmatdelimskip} +% \poption Use: Specifies the glue to insert between delimiters and the internal +% |array| environment in (un-starred) math-mode matrix macros, i.e., all +% math-mode utility macros except |\spalignvector|.\endopt +% \poption Format: Should either be empty, or expand to a legal |\hskip|, +% |\mskip|, or |\kern| command. (Really any sequence of tokens can be +% specified; they will dutifully be inserted between the delimiters and the +% |array|, but this behavior may change in future versions.)\endopt +% \poption Default: |matdelimskip=\,|\endopt +% \poption Macro: |\def\spalignmatdelimskip|\marg{skip}\endopt +% \smallskip +% Actually, an additional skip of |\hskip-\arraycolsep| is always added; the +% effect is that if |matdimskip| is empty, then there is no extra space between +% the outer columns of the |array| and the delimiters. This is how the +% \textsf{amsmath} package's |matrix| environment is defined. It is this +% package author's opinion that matrices look better when a thin space is added +% between the outer columns of the |array| and the delimiters. To keep the +% original array spacing inside the delimiters, specify +% |matdelimskip=\hskip\arraycolsep|. +% +% Here are four matrices typeset, respectively, with |matdelimskip| +% set to |{}|, |\,|, |\;|, and |{\hskip\arraycolsep}|. +% \[ \def\spalignmatdelimskip{} \spalignmat{10 20; 30 40} \quad +% \def\spalignmatdelimskip{\,} \spalignmat{10 20; 30 40} \quad +% \def\spalignmatdelimskip{\;} \spalignmat{10 20; 30 40} \quad +% \def\spalignmatdelimskip{\hskip\arraycolsep} \spalignmat{10 20; 30 40} +% \] +% +% \bigskip +% \noindent +% \DescribeMacro{vecdelimskip} +% \DescribeMacro{\spalignvecdelimskip} +% These function the same way as |matdelimskip| and |\spalignmatdelimskip|, +% except they apply only to the |\spalignvector| macro. The default is no extra +% skip in vectors, i.e., |vecdelimskip={}|. +% +% \bigskip +% \noindent +% \DescribeMacro{sysdelimskip} +% \DescribeMacro{\spalignsysdelimskip} +% These function the same way as |matdelimskip| and |\spalignmatdelimskip|, +% except they apply only to the |\spalignsys| macro. The default is +% |sysdelimskip=\,|. +% +% Actually there is a slight difference: the |\halign| primitive used in the +% |\spalignsys| macro does not put glue on the outsides of the columns, so that +% it is unnecessary to subtract any |\arraycolsep| glue. +% +% \bigskip +% \noindent +% \DescribeMacro{systabspace} +% \DescribeMacro{\spalignsystabspace} +% \poption Use: Specifies the amount of glue between columns in +% |\spsysalign|.\endopt +% \poption Format: Must be a legal glue specification.\endopt +% \poption Default: |systabspace=1pt|\endopt +% \poption Macro: |\spalignsystabspace=|\meta{glue}\endopt +% \smallskip +% Equations with operators, relations, and variables all aligned look a +% better with a bit of extra spacing between these three. Setting |systabspace| +% to zero will cause the equations to use their natural spacing, subject to +% the alignment. For example, the following systems of equations were typeset, +% respectively, with |systabspace| set to |0pt|, |1pt|, and |5pt|. +% \[ +% \spalignsystabspace=0pt \spalignsys{2x + y = 4; x - 3y = -17} \qquad +% \spalignsystabspace=1pt \spalignsys{2x + y = 4; x - 3y = -17} \qquad +% \spalignsystabspace=5pt \spalignsys{2x + y = 4; x - 3y = -17\rlap.} +% \] +% +% \bigskip +% \noindent +% \DescribeMacro{endofrow} +% \DescribeMacro{\spalignendofrow} +% \poption Use: Specifies the token to convert into the end-of-row +% control sequence |\\| (really into the contents of |\spalignendline|) during +% retokenization.\endopt +% \poption Format: Must consist of a single token.\endopt +% \poption Default: |endofrow=;|\endopt +% \poption Macro: |\def\spalignendofrow|\marg{token}\endopt +% \smallskip +% For example, +% \begin{verbatim} +% \[ \def\spalignendofrow{|} +% \spalignmat{1;2 3;4 | 5;6 7;8} \]\end{verbatim} +% produces +% \[ \def\spalignendofrow{|} \spalignmat{1;2 3;4 | 5;6 7;8}. \] +% +% \bigskip +% \noindent +% \DescribeMacro{separator} +% \DescribeMacro{\spalignseparator} +% \poption Use: Specifies a token (in addition to space tokens) to convert into +% the alignment character `|&|' (really the contents of |\spalignseparator|) +% during retokenization.\endopt +% \poption Format: Must consist of a single token.\endopt +% \poption Default: |separator={,}|\endopt +% \poption Macro: |\def\spalignseparator|\marg{token}\endopt +% \smallskip +% For example, +% \begin{verbatim} +% \[ \def\spalignseparator{|} +% \spalignmat{(1,2)|(3,4);(5,6)|(7,8)} \]\end{verbatim} +% produces +% \[ \def\spalignseparator{|} \spalignmat{(1,2)|(3,4);(5,6)|(7,8)}. \] +% +% \bigskip +% The following commands can be redefined to affect the behavior of the package, +% but cannot be specified as key-value pairs when the package is loaded. +% +% \bigskip +% \noindent +% \DescribeMacro{\spalignendline} +% \poption Use: The end-of-row token is replaced by the top-level expansion of +% this macro during retokenization.\endopt +% \poption Format: May contain any tokens.\endopt +% \poption Default: |\def\spalignendline{\\}|\endopt +% \smallskip +% This is useful, for instance, when using \textsf{spalign} in conjunction with +% plain \TeX-style alignment macros that use |\cr| as the end-of-row token. +% See the documentation for |\spalignrun| in~\S\ref{sec:general} and the +% implementation of |\spalignsys| for examples. +% +% \bigskip +% \noindent +% \DescribeMacro{\spalignaligntab} +% \poption Use: Spaces and the contents of |\spalignseparator| are replaced by the +% top-level expansion of this macro during retokenization.\endopt +% \poption Format: May contain any tokens.\endopt +% \poption Default: |\def\spalignaligntab{&}|\endopt +% \smallskip +% This is useful, for instance, in one-column alignments. For example, +% \begin{verbatim} +% \[ \def\spalignaligntab{\\} \spalignmat{12 1 2 13} \]\end{verbatim} +% produces +% \[ \def\spalignaligntab{\\} \spalignmat{12 1 2 13}. \] +% The |\spalignvector| macro is defined in this way. +% +% +% \subsection{General macros}\label{sec:general} +% The following macros are meant to make it easy to make new utility macros +% in different situations using \textsf{spalign}. +% +% \bigskip +% \noindent +% \DescribeMacro{\spalignretokenize} +% \usage\spalignretokenize{\marg{text}} +% Applies the retokenization procedure to \meta{text}, and expands to the +% retokenized version. For instance, |\spalignretokenize{1 2; 3 4}| expands to +% |1&2\\3&4|. +% For example, using the |split| environment from the +% \textsf{amsmath} package, +% \begin{verbatim} +% \[ \begin{split} +% \spalignretokenize{f_0 =1; f_1 =1; f_{n+2} =f_n+f_{n+1}} +% \end{split} \]\end{verbatim} +% produces +% \[ \begin{split} +% \spalignretokenize{f_0 =1; f_1 =1; f_{n+2} =f_n+f_{n+1}}. +% \end{split} \] +% +% \bigskip +% \noindent +% \DescribeMacro{\spalignrun} +% \usage\spalignrun{\marg{tokens}\marg{text}} +% Applies the retokenization procedure to \meta{text}, saving the result into +% the token register |\spaligntoks| (see below). Then executes \meta{tokens}, +% which presumably makes reference to |\spaligntoks|. For example, +% \begin{verbatim} +% \[ \def\spalignendline{\cr} +% \spalignrun{\bordermatrix{\the\spaligntoks}} +% {, x y; u 1 2; v 3 4} \]\end{verbatim} +% produces +% \[ \def\spalignendline{\cr} +% \spalignrun{\bordermatrix{\the\spaligntoks}} +% {, x y; u 1 2; v 3 4}. \] +% +% \bigskip +% \noindent +% \DescribeMacro{\spalignenv} +% \usage\spalignenv{\marg{before-tokens}\marg{after-tokens}\marg{text}} +% Convenience macro that expands to +% \[ \hbox{|\spalignrun{|\meta{before-tokens} +% |\the\spaligntoks| \meta{after-tokens}|}{|\meta{text}|}|.} \] +% For example, using the |align*| environment from the +% \textsf{amsmath} package, +% \begin{verbatim} +% \spalignenv{\begin{align*}}{\end{align*}}% +% {x =y x' =y'; z =w z' =w'.}\end{verbatim} +% produces +% \spalignenv{\begin{align*}}{\end{align*}}% +% {x =y x' =y'; z =w z' =w'.} +% +% \bigskip +% The \meta{tokens} arguments of |\spalignrun| and |\spalignenv| have access to +% the following registers, which are defined locally in a group inside +% |\spalignrun| and |\spalignenv|. +% +% \bigskip +% \noindent +% \DescribeMacro{\spaligntoks} +% A tokens register that contains the result of the retokenizing procedure. +% +% \bigskip +% \noindent +% \DescribeMacro{\spalignmaxcols} +% A count register that contains the maximum number of columns in any given row, +% as parsed by the retokenizer. This is used in |\spalignmat| and in the +% |\spalignaugmat| family of macros. + +% \StopEventually{} +% +% \section{Implementation} +% +% \subsection{Options processing} +% +% \begin{macrocode} +\makeatletter + +\RequirePackage{kvoptions} +% \end{macrocode} +% With the following options, the key |foo| gets stored as |\spalign@foo|. +% \smallskip +% \begin{macrocode} +\SetupKeyvalOptions{family=spalign,prefix=spalign@} + +\DeclareStringOption[()]{delims} +\DeclareStringOption[\{.]{sysdelims} +\DeclareStringOption[\,]{matdelimskip} +\DeclareStringOption[]{vecdelimskip} +\DeclareStringOption[\,]{sysdelimskip} +\DeclareStringOption[1pt]{systabspace} +\DeclareStringOption[;]{endofrow} +\DeclareStringOption[,]{separator} + +\ProcessLocalKeyvalOptions* + +\def\spaligndelims#1#2{% + \def\spalign@leftdelim{#1}\def\spalign@rightdelim{#2}} +\expandafter\spaligndelims\spalign@delims +\def\spalignsysdelims#1#2{% + \def\spalign@sysleftdelim{#1}\def\spalign@sysrightdelim{#2}} +\expandafter\spalignsysdelims\spalign@sysdelims +\let\spalignmatdelimskip=\spalign@matdelimskip +\let\spalignvecdelimskip=\spalign@vecdelimskip +\let\spalignsysdelimskip=\spalign@sysdelimskip +\newdimen\spalignsystabspace +\spalignsystabspace=\spalign@systabspace +\let\spalignendofrow=\spalign@endofrow +\let\spalignseparator=\spalign@separator +\def\spalignendline{\\} +\def\spalignaligntab{&} +% \end{macrocode} +% +% \bigskip +% \subsection{Main retokenizing code} +% The retokenizer processes the input token list one ``item'' at a time, +% performing replacements as necessary, and saving the resulting tokens in +% |\spaligntoks|. The difficulties arise because of the special treatment that +% \TeX\ gives to spaces and braces. First let's review the rules of the game: +% \begin{enumerate}\itemsep=1\jot\parskip=0pt +% \item Spaces after a control sequence are not tokenized. +% \item Multiple spaces are tokenized into a single space. +% \item Space tokens between a control sequence and its argument are ignored: +% undelimited spaces are never interpreted as a macro argument. +% \item Braces around a macro argument are stripped. +% \item The |\futurelet|\meta{control sequence}\meta{token1}\meta{token2} syntax +% will |\let| the specified \meta{control sequence} be \meta{token2}, nomatter +% what kind of token \meta{token2} is. +% \end{enumerate} +% Consider then a macro |\retokenize#1{...}| and the token sequence +% \[ \hbox{|\retokenize |\tvs|{\bf a}b|} \] +% The |\retokenize| macro needs to recognize both the space (as it should be +% replaced by an align token, if other non-space tokens have just been processed), +% and the braces (so |{\bf a}b| is not replaced by |\bf ab|). However, the +% argument to |\retokenize| will be |\bf a|; the space and braces are ignored. +% +% The solution, of course, is judicious use of |\futurelet|. (One could +% conceivably use |\let| and |\futurelet| exclusively, except then one would +% have the opposite problem: we \emph{want} the retokenizer to swallow whole +% arguments in braces.) This is still somewhat tricky: +% \[ \hbox{|\futurelet\next\retokenize |\tvs|{\bf a}b|} \] +% will expand |\retokenize| with the argument set to |\bf a| and |\next| +% behaving like \tvs, but the braces will still disappear. Hence one has to use +% the |\futurelet| in a macro which does not take any arguments. +% +% Here is the outline of the solution to the problem used in this package. The +% |\spalign@gobble@spaces| macro has the effect of deleting the subsequent +% sequence of space tokens and replacing them with the token +% |\spalign@parsetoks|. It sets |\spalign@saw@spacetrue| if it ate at least +% one space token, and in any case it sets |\spalign@nexttok| to the following +% token. The |\spalign@parsetoks| macro takes one argument. When it is +% executed, |\spalign@nexttok| represents a non-space token. Now +% |\spalign@parsetoks| knows if the token beginning its argument is a brace, and +% it knows if there was a space preceding the brace as well, using +% |\ifspalign@saw@space|. It can proceed to parse its argument in a +% straightforward manner, eventually expanding back into +% |\splign@gobble@spaces|, unless it sees |\spalign@end|, which signifies the +% end of input. +% +% See Appendix~D in the {\TeX}book for a discussion of these kinds of tricks. +% +% \begin{macro}{\spalign@makespace} +% This macro expands to a single space token. It is mildly tricky to +% construct, since \TeX\ allows one optional space token after |\let\foo| or +% |\let\foo=|, but multiple spaces are combined into one space token. Here is +% one trick for producing two consecutive space tokens. See Exercise~24.6 in +% the {\TeX}book. +% \begin{macrocode} +\begingroup +\def\\{\global\let\spalign@space= } \\ % +\endgroup +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalign@end} +% Sentinel macro that is used to mark the end-of-input for +% |\spalign@parsetoks|. Defining it recursively like this has the +% disadvantage that \LaTeX\ will hang if it tries to expand |\spalign@end|. +% On the other hand, one can test whether a token is |\spalign@end| using +% |\ifx| without using some other sentinel expansion of the macro, and the +% only reason |\spalign@end| would be executed is if there is a bug in this +% package. +% \begin{macrocode} +\def\spalign@end{\spalign@end} +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalign@bgroup} +% This is just used to test whether a token is a literal |\bgroup| (as opposed +% to an actual open brace |{|) using |\ifx|. +% \begin{macrocode} +\def\spalign@bgroup{\bgroup} +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalign@curcols} +% This counter keeps track of how many columns are in the current row. +% \begin{macrocode} +\newcount\spalign@curcols +% \end{macrocode} +% \end{macro} +% \begin{macro}{\ifspalign@ignorespaces} +% Boolean variable which keeps track of whether spaces should be ignored in +% the current state, like after an end-of-row token. +% \begin{macrocode} +\newif\ifspalign@ignorespaces +% \end{macrocode} +% \end{macro} +% \begin{macro}{\ifspalign@saw@space} +% Boolean variable which is true if the argument to |\spalign@parsetoks| was +% preceded by at least one space token. +% \begin{macrocode} +\newif\ifspalign@saw@space +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalign@gobble@spaces} +% This macro has the effect of deleting any subsequent space tokens, replacing +% them with |\spalign@parsetoks|. It sets |\spalign@nexttok| to the next +% (non-space) token, and sets |\spalign@saw@spacetrue| if it ate at least one +% space. The boolean variable |\ifspalign@saw@space| should be false before +% |\spalign@gobble@spaces| is first executed. +% +% The macro |\spalign@gobble@next| has the effect of replacing the following +% token with |\spalign@gobble@spaces|. +% \begin{macrocode} +\def\spalign@gobble@next{% + \afterassignment\spalign@gobble@spaces\let\spalign@atoken= } +\def\spalign@check@space{% + \ifx\spalign@nexttok\spalign@space% + \spalign@saw@spacetrue% + \let\spalign@next=\spalign@gobble@next% + \else% +% \end{macrocode} +% Don't set |\spalign@saw@spacefalse| here: eventually we will run +% into a non-space token. +% \begin{macrocode} + \let\spalign@next=\spalign@parsetoks% + \fi% + \spalign@next% + } +\def\spalign@gobble@spaces{% + \futurelet\spalign@nexttok\spalign@check@space} +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalign@append} +% Convenience macro that appends its argument, unexpanded, onto the token +% register |\spaligntoks|. +% \begin{macrocode} +\def\spalign@append#1{% + \begingroup% + \toks255={#1}% +% \end{macrocode} +% The |\edef| and |\xdef| macros do not expand tokens obtained by expanding a +% token register. +% \begin{macrocode} + \xdef\spalign@settok{% + \spaligntoks={\the\spaligntoks\the\toks255}}% + \endgroup% + \spalign@settok% + } +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalign@addcol} +% Convenience macro to take care of housekeeping when an align column has been +% parsed but the row is not complete. Note that it appends the top-level +% expansion of |\spaligntab| to |\spaligntoks|, not the token |\spaligntab| +% itself. +% \begin{macrocode} +\def\spalign@addcol{% + \expandafter\spalign@append\expandafter{\spalignaligntab}% + \advance\spalign@curcols by 1 % + } +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalign@endrow} +% Convenience macro to take care of housekeeping when a row has been ended, +% either by an end-of-row token or an end-of-input token. +% \begin{macrocode} +\def\spalign@endrow{% + \advance\spalign@curcols by 1 % + \ifnum\spalign@curcols>\spalignmaxcols% + \spalignmaxcols=\spalign@curcols% + \fi% + \spalign@curcols=0% + \spalign@ignorespacestrue% + } +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalign@normaltok} +% Convenience macro to take care of housekeeping when a non-special token (not +% a space, end-of-row token, separator token, or end-of-input token) has been +% parsed. The boolean variable |\ifspalign@saw@space| will be true if the token +% preceding the non-special token was a space. +% \begin{macrocode} +\def\spalign@normaltok{% + \ifspalign@saw@space% + \ifspalign@ignorespaces% + \else% + \spalign@addcol% + \fi% + \fi% + \spalign@ignorespacesfalse% + } +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalign@parsetoks} +% This is the main retokenizing routine. It is only called by +% |\spalign@gobble@spaces|. When it is expanded, |\spalign@nexttok| is the +% token that immediately follows the |\spalign@parsetoks| token itself; this +% is not a space. The value of the boolean variable |\ifspalign@saw@space| is +% true if there was a space before the argument of |\spalign@parsetoks| in the +% token list. +% \begin{macrocode} +\def\spalign@parsetoks#1{% + \let\spalign@next=\spalign@gobble@spaces% +% \end{macrocode} +% This is for |\ifx| comparisons: +% \begin{macrocode} + \def\spalign@arg{#1}% +% \end{macrocode} +% Anything in braces is passed through untouched: +% \begin{macrocode} + \ifx\spalign@nexttok\bgroup% + \spalign@normaltok% + \ifx\spalign@arg\spalign@bgroup% +% \end{macrocode} +% The argument is a literal |\bgroup|, not a brace. +% \begin{macrocode} + \spalign@append{#1}% + \else% +% \end{macrocode} +% Re-wrap the argument in braces and append. +% \begin{macrocode} + \spalign@append{{#1}}% + \fi% + \else% +% \end{macrocode} +% The argument is not wrapped in braces. +% \begin{macrocode} + \ifx\spalign@arg\spalignendofrow% +% \end{macrocode} +% End-of-row token. Append the top-level expansion of |\spalignendline|. +% (Ignore previous spaces.) +% \begin{macrocode} + \expandafter\spalign@append\expandafter{\spalignendline}% + \spalign@endrow% + \else% + \ifx\spalign@arg\spalignseparator% +% \end{macrocode} +% Separator token. (Ignore previous spaces.) +% \begin{macrocode} + \spalign@addcol% + \spalign@ignorespacestrue% + \else% + \ifx\spalign@arg\spalign@end% +% \end{macrocode} +% End-of-input token. End the current row to record |\spalign@maxcols|. +% (Ignore previous spaces.) +% \begin{macrocode} + \let\spalign@next=\relax% + \spalign@endrow% + \else% +% \end{macrocode} +% Non-special token. +% \begin{macrocode} + \spalign@normaltok% + \spalign@append{#1}% + \fi% + \fi% + \fi% + \fi% +% \end{macrocode} +% Reset |\ifspalign@saw@space| for the next |\spalign@gobble@spaces|. +% \begin{macrocode} + \spalign@saw@spacefalse% + \spalign@next% + } +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalign@process} +% This is a wrapper for |\spalign@parsetoks|. It initializes registers and +% boolean variables, then starts the parsing routine with +% |\spalign@gobble@spaces|. It should be run in a local group. It stops +% processing at |\spalign@end|. It fills |\spalignmaxcols| and |\spaligntoks| +% with the results of the retokenization. It replaces everything in the token +% list up through |\spalign@end| with |\relax|. +% \begin{macrocode} +\def\spalign@process{% + \spaligntoks={}% + \spalignmaxcols=0% + \spalign@curcols=0% + \spalign@ignorespacestrue% + \spalign@saw@spacefalse% + \spalign@gobble@spaces% + } +% \end{macrocode} +% \end{macro} +% +% \subsection{Poor man's starred commands} +% There are several excellent packages that allow for flexible command +% specifications. However, the needs of this package are minimal as regards +% starred commands, so in order to reduce dependencies, this package contains +% its own simple implimentation. +% +% \begin{macro}{\ifspalign@star} +% Boolean variable which records whether or not the current command has a star +% on it. +% \begin{macrocode} +\newif\ifspalign@star +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalign@def@star} +% Used like |\def|, the command |\spalign@def@star\foo{...}| defines a macro +% |\foo| which can be called as |\foo| or |\foo*|. In the body of |\foo|, +% the boolean variable |\ifspalign@star| indicates whether the command was +% called with a star. +% +% This command actually defines three commands: |\foo|, |\foo@x|, and +% |\foo@star|. The first calls the second with |\spalign@nexttok| defined via +% |\futurelet| to the token following |\foo|. The command |\foo@x| checks +% whether or not the next token is a star, and if it is, it is removed from +% the token list. It then sets |\ifspalign@star| appropriately and calls +% |\foo@star|, which contains the original command definition. Of course, +% |\foo@star| can then be redefined, for instance using |\newcommand|, to take +% advantage of \LaTeX's optional argument parsing. +% \begin{macrocode} +\def\spalign@gobble@one#1{} + +\def\spalign@def@star#1{% +% \end{macrocode} +% If |#1| is |\foo|, then |\spalign@cmd| expands to |\foo|, +% |\spalign@cmd@x| expands to |\foo@x|, and |\spalign@cmd@star| expands to +% |\foo@star|. +% \begin{macrocode} + \def\spalign@cmd{#1}% + \edef\spalign@cmd@x{% + \csname\expandafter\spalign@gobble@one\string#1@x\endcsname}% + \edef\spalign@cmd@star{% + \csname\expandafter\spalign@gobble@one\string#1@star\endcsname}% +% \end{macrocode} +% Make |\foo@x| unexpandable. (The |\csname...\endcsname| construction +% already does this, but only if |\foo@x| was previously undefined.) This +% makes it easier to define |\foo|. +% \begin{macrocode} + \expandafter\let\spalign@cmd@x=\relax + \expandafter\edef\spalign@cmd{% + \futurelet\noexpand\spalign@nexttok\spalign@cmd@x}% +% \end{macrocode} +% I don't know a less annoying but still short way of defining a token list +% where only one token in the middle is to be expanded, and that one token only +% once (not recursively). +% \begin{macrocode} + \def\spalign@mkcmd##1{% + \expandafter\def\spalign@cmd@x{% + \ifx\spalign@nexttok*% + \spalign@startrue% + \let\spalign@next=\spalign@gobble@one% + \else% + \spalign@starfalse% + \def\spalign@next{}% + \fi% +% \end{macrocode} +% Expanding |\spalign@gobble@one| before |##1| (which is |\foo@star|) eats the +% star before parsing the arguments for |\foo@star|. +% \begin{macrocode} + \expandafter##1\spalign@next% + }% + }% + \expandafter\spalign@mkcmd\spalign@cmd@star% + \expandafter\def\spalign@cmd@star% + } +% \end{macrocode} +% \end{macro} +% +% \subsection{General macros} +% +% Here are the definitions of the macros presented in~\S\ref{sec:general}. +% \begin{macrocode} +\newtoks\spaligntoks +\newcount\spalignmaxcols +% \end{macrocode} +% \begin{macro}{\spalignrun} +% Calls |\spalign@process| on |#2|, then inserts |#1|, in a group. +% Presumably |#1| will refer to |\spaligntoks| and/or |\spalignmaxcols|. +% \begin{macrocode} +\def\spalignrun#1#2{% + \begingroup% + \spalign@process#2\spalign@end% + %\showthe\spaligntoks% For debugging + #1% + \endgroup% + } +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalignenv} +% This effectively calls |\spalign@process| on |#3|, then puts the resulting +% token list between |#1| and |#2|. Both |#1| and |#2| have access to +% |\spaligntoks| and |\spalignmaxcols|. +% \begin{macrocode} +\def\spalignenv#1#2{% + \spalignrun{% + #1% + \the\spaligntoks% + #2% + }% + } +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalignretokenize} +% This calls |\spalign@process| on |#1|, then expands to |\the\spaligntoks|. +% \begin{macrocode} +\def\spalignretokenize#1{% + \begingroup% + \spalign@process#1\spalign@end% + \expandafter\endgroup\the\spaligntoks% + } +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spaligntabular} +% Tabular utility macro. +% \begin{macrocode} +\def\spaligntabular#1#2{% + \begin{tabular}{#1}\spalignretokenize{#2}\end{tabular}} +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalign@maybedelim} +% This is like |\spalignenv|, but it adds delimiters and the glue specified in +% |#3| before |#1| and after |#2|, if |\ifspalign@star| is false. +% \begin{macrocode} +\def\spalign@maybedelim#1#2#3{% + \spalignenv% + {\ifspalign@star\else\left\spalign@leftdelim#3\fi#1}% + {#2\ifspalign@star\else#3\right\spalign@rightdelim\fi}% + } +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalignarray} +% Array utility macro with delimiters. +% \begin{macrocode} +\spalign@def@star\spalignarray#1{% + \spalign@maybedelim% + {\begin{array}{#1}}% + {\end{array}}% + {\hskip-\arraycolsep\spalignmatdelimskip}% + } +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalignvector} +% Vector utility macro: an array with one column, with |\spaligntab| set to +% |\\| so that spaces produce new rows. +% \begin{macrocode} +\spalign@def@star\spalignvector{} +\renewcommand\spalignvector@star[2][c]{% + \begingroup% + \def\spalignaligntab{\\}% + \spalign@maybedelim% + {\begin{array}{#1}}% + {\end{array}}% +% \end{macrocode} +% Note the use of |\spalignvecdelimskip| here. +% \begin{macrocode} + {\hskip-\arraycolsep\spalignvecdelimskip}% + {#2}% + \endgroup% + } +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalign@repeat} +% Sets |\spalign@repeated| to |#1|, repeated |#2| times. Used for +% auto-constructing |array| alignment specifications from |\spalignmaxcols|. +% \begin{macrocode} +\def\spalign@repeat#1#2{% + \begingroup% + \count255=0 % + \toks255={}% + \loop\ifnum\count255<#2% + \edef\spalign@settok{\toks255={\the\toks255 #1}}% + \spalign@settok% + \advance\count255 by 1 % + \repeat% + \xdef\spalign@repeated{\the\toks255}% + \endgroup + } +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalignmat} +% Matrix utility macro. Uses |\spalignmaxcols| and |\spalign@repeat| to +% construct the |array| align specification. +% \begin{macrocode} +\spalign@def@star\spalignmat{} +\renewcommand\spalignmat@star[1][c]{% + \spalign@maybedelim{% + \spalign@repeat{#1}{\spalignmaxcols}% + \edef\spalign@barray{\noexpand\begin{array}{% + \spalign@repeated}}% + \spalign@barray% + }{\end{array}% + }{\hskip-\arraycolsep\spalignmatdelimskip}% + } +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalignaugmatn} +% Augmented matrix with |#2| columns on the right of the vertical bar. Uses +% |\spalignmaxcols| and |\spalign@repeat| to construct the |array| align +% specification. +% \begin{macrocode} +\spalign@def@star\spalignaugmatn{} +\renewcommand\spalignaugmatn@star[2][r]{% + \spalign@maybedelim{% + \advance\spalignmaxcols by -#2 % + \spalign@repeat{#1}{\spalignmaxcols}% + \let\spalign@repeated@one=\spalign@repeated% + \spalign@repeat{#1}{#2}% + \let\spalign@repeated@two=\spalign@repeated% + \edef\spalign@barray{\noexpand\begin{array}{% + \spalign@repeated@one|\spalign@repeated@two}}% + \spalign@barray% + }{\end{array}% + }{\hskip-\arraycolsep\spalignmatdelimskip}% + }% +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalignaugmat} +% Augmented matrix with one column on the right of the vertical bar. +% \begin{macrocode} +\spalign@def@star\spalignaugmat{} +\renewcommand\spalignaugmat@star[1][r]{% + \spalignaugmatn@star[#1]{1}% + }% +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalignaugmathalf} +% Augmented matrix with (ceiling of) half the columns on the right. +% \begin{macrocode} +\spalign@def@star\spalignaugmathalf{} +\renewcommand\spalignaugmathalf@star[1][r]{% + \spalign@maybedelim{% + \count255=\spalignmaxcols% + \divide\spalignmaxcols by 2 % + \advance\count255 by -\spalignmaxcols% + \spalign@repeat{#1}{\spalignmaxcols}% + \let\spalign@repeated@one=\spalign@repeated% + \spalignmaxcols=\count255% + \spalign@repeat{#1}{\spalignmaxcols}% + \let\spalign@repeated@two=\spalign@repeated% + \edef\spalign@barray{\noexpand\begin{array}{% + \spalign@repeated@one|\spalign@repeated@two}}% + \spalign@barray% + }{\end{array}% + }{\hskip-\arraycolsep\spalignmatdelimskip}% + }% +% \end{macrocode} +% \end{macro} +% \begin{macro}{\spalignsys} +% System of equations with aligned operators and variables. +% \begin{macrocode} +\spalign@def@star\spalignsys#1{% + \ifspalign@star\else% + \left\spalign@sysleftdelim\spalignsysdelimskip% + \fi% + \vcenter{% + \def\spalignendline{\cr}% + \openup1pt% + \tabskip=0pt% + \def\+{\mathbin{\phantom{+}}}% + \def\={\mathrel{\phantom{=}}}% + \def\.{}% + \halign{% +% \end{macrocode} +% Adding |{}| to each side of the align argument in the even columns causes +% binary operators ($+$, $-$, $\ldots$) and relations ($=$, $<$, $\ldots$) to +% use their natural spacing. Assuming the even columns contain only binary +% operators (resp.\ only relations), these columns will all be the same width. +% The |\hfil| in the odd columns right-justifies. There should be no spaces in +% the templates. +% \begin{macrocode} + \tabskip=\spalignsystabspace% + &$\hfil##$&${}##{}$\cr% + \spalignretokenize{#1}\crcr% + }% +% \end{macrocode} +% It seems that one can't specify tabskip glue for after the last column when +% there are repeated templates. +% \begin{macrocode} + }\hskip-\spalignsystabspace% + \ifspalign@star\else% + \spalignsysdelimskip\right\spalign@sysrightdelim% + \fi% + } +% \end{macrocode} +% \end{macro} +% \begin{macrocode} +\makeatother +% \end{macrocode} +% \Finale +\endinput diff --git a/Master/texmf-dist/source/latex/spalign/spalign.ins b/Master/texmf-dist/source/latex/spalign/spalign.ins new file mode 100644 index 00000000000..ba66ef710f6 --- /dev/null +++ b/Master/texmf-dist/source/latex/spalign/spalign.ins @@ -0,0 +1,55 @@ +%% +%% Copyright (C) 2016 by Joseph Rabinoff <rabinoff@math.gatech.edu> +%% +%% This file may be distributed and/or modified under the conditions of +%% the LaTeX Project Public License, either version 1.3 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 1.3 or later is part of all distributions of LaTeX version +%% 2005/12/01 or later. +%% + +\input docstrip.tex +\keepsilent + +\usedir{tex/latex/spalign} + +\preamble + +This is a generated file. + +Copyright (C) 2016 by Joseph Rabinoff <rabinoff@math.gatech.edu> + +This file may be distributed and/or modified under the conditions of +the LaTeX Project Public License, either version 1.3 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 1.3 or later is part of all distributions of LaTeX version +2005/12/01 or later. + +\endpreamble + +\generate{\file{spalign.sty}{\from{spalign.dtx}{package}}} + +\obeyspaces +\Msg{*************************************************************} +\Msg{* *} +\Msg{* To finish the installation you have to move the following *} +\Msg{* file into a directory searched by TeX: *} +\Msg{* *} +\Msg{* spalign.sty *} +\Msg{* *} +\Msg{* To produce the documentation run the file spalign.dtx *} +\Msg{* through LaTeX. *} +\Msg{* *} +\Msg{* Happy TeXing! *} +\Msg{* *} +\Msg{*************************************************************} + +\endbatchfile |