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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Simpler Wick Contractions
% Copyright (C) 2014 Joshua Ellis
%
% An simpler implementation of the Wick contractions.
%
%
% This work 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.
%
% This work has the LPPL maintenance status `maintained'.
%
% The Current Maintainer of this work is Joshua Ellis.
%
% This program is distributed in the hope that it will be useful, but WITHOUT
% ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
% FOR A PARTICULAR PURPOSE. See the LaTeX Project Public License for more
% details.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ProvidesPackage{simpler-wick}[2015/12/11 Simpler Wick contractions]
\RequirePackage{tikz}
\RequirePackage{pgfopts}
\usetikzlibrary{calc}
\usetikzlibrary{external}
\pgfkeys{
/simplerwick/.is family,
/simplerwick,
sep/.store in=\swick@sep,
sep=3pt,
offset/.store in=\swick@offset,
offset=1em}
\ProcessPgfOptions{/simplerwick}
% Works just like \@ifnextchar[, except for digits [1-9]
\def\swick@ifnextdigit#1#2{
\@ifnextchar 1{#1}{
\@ifnextchar 2{#1}{
\@ifnextchar 3{#1}{
\@ifnextchar 4{#1}{
\@ifnextchar 5{#1}{
\@ifnextchar 6{#1}{
\@ifnextchar 7{#1}{
\@ifnextchar 8{#1}{
\@ifnextchar 9{#1}{#2}}}}}}}}}}
% A count to keep track of how many contraction are currently open.
\countdef\swick@count=0
% Convert the digit to its representation as a word
\def\swick@translate#1{%
\ifcase#1\or
one\or
two\or
three\or
four\or
five\or
six\or
seven\or
eight\or
nine\fi
}
% Keeping track of which contraction is open or closed.
\newif\ifswick@if@one@
\newif\ifswick@if@two@
\newif\ifswick@if@three@
\newif\ifswick@if@four@
\newif\ifswick@if@five@
\newif\ifswick@if@six@
\newif\ifswick@if@seven@
\newif\ifswick@if@eight@
\newif\ifswick@if@nine@
% Shortcut to the ith 'if' variable
\def\swick@settrue@#1{
\csname swick@if@\swick@translate{#1}@true\endcsname}
\def\swick@setfalse@#1{
\csname swick@if@\swick@translate{#1}@false\endcsname}
% Returns true or false based on whether the ith. Use as:
%
% \if\swick@cond@4
% <if true>
% \else
% <if false
% \fi
\def\swick@cond@#1{
TT\fi
\csname ifswick@if@\swick@translate{#1}@\endcsname}
% Check if *any* of the ifs is true.
\def\swick@cond@any#1#2{
\if\swick@cond@1{#1}\else
\if\swick@cond@2{#1}\else
\if\swick@cond@3{#1}\else
\if\swick@cond@4{#1}\else
\if\swick@cond@5{#1}\else
\if\swick@cond@6{#1}\else
\if\swick@cond@7{#1}\else
\if\swick@cond@8{#1}\else
\if\swick@cond@9{#1}\else
{#2}
\fi\fi\fi\fi\fi\fi\fi\fi\fi}
% Set all ifs back to false.
\def\swick@cond@reset{
\swick@setfalse@1
\swick@setfalse@2
\swick@setfalse@3
\swick@setfalse@4
\swick@setfalse@5
\swick@setfalse@6
\swick@setfalse@7
\swick@setfalse@8
\swick@setfalse@9
}
% Do nothing
\def\swick@ignore#1{}
% Delegate to the appropriate subfunction based on the next char:
% - 0: do nothing
% - [1-9]: Open the given contraction
% - anything else: Open contraction 1
\def\swick@smart{
\@ifnextchar0{
\swick@ignore
}{
\swick@ifnextdigit{
\swick@smart@
}{
\swick@smart@1
}}}
% Open or close the given contraction.
\def\swick@smart@#1#2{
\if\swick@cond@#1
\swick@end#1{#2}
\else
\swick@begin#1{#2}
\fi}
% Open a contraction
\def\swick@begin#1#2{
% swick@max keeps track of the tallest contraction yet.
\ifnum\swick@max<#1
\def\swick@max{#1}
\fi
\swick@settrue@#1
\tikzexternaldisable
\begin{tikzpicture}[remember picture, baseline=(swick-open#1.base)]
\node[use as bounding box, inner sep=0pt, outer sep=0pt] (swick-open#1) {$\displaystyle #2$};
\end{tikzpicture}
\tikzexternalenable
}
\def\swick@end#1#2{
\swick@setfalse@#1
\tikzexternaldisable
\begin{tikzpicture}[remember picture, baseline=(swick-close#1.base)]
\node[use as bounding box, inner sep=0pt, outer sep=0pt] (swick-close#1) {$\displaystyle #2$};
\end{tikzpicture}
\tikz[remember picture, overlay]
\draw ($(swick-open#1.north) + (0, 3pt)$)
-- ($(swick-open#1.base) + (0, \swick@offset) + #1*(0, \swick@sep)$)
-- ($(swick-close#1.base) + (0, \swick@offset) + #1*(0, \swick@sep)$)
-- ($(swick-close#1.north) + (0, 3pt)$);
\tikzexternalenable}
% Start the \wick environment, checking optional arguments if needed.
\def\wick{
\@ifnextchar[{
\wick@
}{
\wick@[]
}}
\def\wick@[#1]#2{
\ifmmode
\begingroup
\pgfkeys{
simplerwick,
#1}
% Define the variables and commands
\swick@cond@reset
\swick@count=0
\def\swick@max{0}
\def\c{\swick@smart}
% Here is the text
#2
% Add a vbox equal to max height
\dimen0=\swick@sep
\multiply\dimen0 by \swick@max
\advance\dimen0 by \swick@offset
\vbox to \dimen0{}
% Check that every has been closed
\swick@cond@any{
\PackageWarning{simpler-wick}{%
I have reached the end of \protect\wick\space with some unclosed
contractions%
}{}
}{}
\endgroup
\else
\PackageWarning{simpler-wick}{%
\protect\wich\space has been called outside a math environment, this will
be ignore%
}
\fi
}
\endinput
% Local Variables:
% TeX-master: "simpler-wick"
% End:
|
