summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/latex/mhequ/mhequ.sty
blob: 86a104f8c08dbcc333379f8a2a63aecdffc21748 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% mhequ.sty v1.5, Copyright 2000 by Martin Hairer
%   This package is public domain. You are strongly encouraged to
%   use it and to widespread it.
%
%   You may download the latest version of this package on my homepage:
%
%              http://www.unige.ch/math/folks/hairer/martin/
%
% Notes:
%   Version 1.5 supports the packages "showkeys" (thus the [draft] option is suppressed)
%   and "hyperref".
%
% Options:
%
%   [lefttag] : Puts the tags to the left side of the page
%   [righttag]: Puts the tags to the right side of the page (default)
%
% Syntax:
%
%   \begin{equ}[label]
%
%	label : if a label is given, the equation is numbered. (default : no label)
%
%
%   \begin{equs}[n]
%
%	n : number of columns. (default : 1) You can also choose n=0.
%           Each line can be labelled separately with the \label command.
%
%   \begin{equa}[n][label]
%
%	n : number of columns. (default : 1) You can also choose n=0.
%	label : if a label is given, the equation is numbered. (default : no label)
%     The order of [n] and [label] is irrelevant.
%
%     In both the equs and the equa environment, the number of '&' signs per line
%     has to be equal to 2*n-1 if n>0 and to 0 if n=0. If there are less '&' signs, they
%     are automatically appended at the end of the line.
%
% Provided commands:
%
%   \tag{theTag}     Replaces the number of the current equation by "theTag"
%
%   \minilab{label}  If "label" has already been used, switches to the minilab "label".
%                    If not, creates a new minilab. Inside a minilab, equations are labelled
%                    (1a), (1b),... instead of (1), (2), etc... You can refer to the number
%                    of the minilab with \ref.
%
%   \setlabtype{style}  Sets the style of the numbering of the minilab. Default is
%                    \setlabtype{alph}.
%
%   \intertext{material} Inserts 'material' between two lines in normal text mode.
%
%   \multicol{n}{material} Spans n columns of the equation array with 'material'. It
%                    has to be placed between two & signs, or at the end or the start
%                    of the line.
%
%   \text{material} Creates a \hbox containing 'material'.
%
% Warnings:
%
%   If you use the \tag command, a quite large number of runs may be needed in
%   order to get the desired output.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{mhequ}
\DeclareOption{righttag}{\global\@leftfalse}
\DeclareOption{lefttag}{\global\@lefttrue}

\newif\if@haslab
\newif\if@useminilab
\newcount\@nocols
\newcount\@nocolstot
\newif\if@tag
\newif\if@left
\@haslabfalse

\ProcessOptions

\def\@MHputleft#1{\kern-\displaywidth\rlap{#1\@MHputnumber}\kern\displaywidth} 
\def\@MHputright#1{\llap{#1\@MHputnumber}}

\if@left\let\@MHput@lbl\@MHputleft%
	\else\let\@MHput@lbl\@MHputright\fi

\def\@MHref#1{\@ifundefined{r@#1}{??}{\@saveref{#1}}}
%%%%% Computes the length of its argument
\newcount\@MHLength
\def\computelength#1{\@MHLength=0 \getlength#1\end}
\def\getlength#1{\ifx#1\end \let\next=\relax \else \advance\@MHLength by1 \let\next=\getlength \fi \next}
	
\def\@makelabel#1{\stepcounter{equation}\global\def\@mylabel{#1}
	\newcounter{lab@#1}\setcounter{lab@#1}{0}
	\global\expandafter\let\expandafter\c@MHCurrentCount\csname c@lab@#1\endcsname
	\global\@namedef{MHused@#1}{}
	\def\@currentlabel{\theequation}\MHsavelabel{#1}
	}
\def\@uselabel#1{\global\def\@mylabel{#1}
	\global\expandafter\let\expandafter\c@MHCurrentCount\csname c@lab@#1\endcsname
	}
\def\@MHreset{\global\def\@MHeqno{\theequation}\global\@useminilabfalse\global\@haslabfalse}
\def\@MHbuildlab#1{\@ifundefined{r@#1}
	{\global\def\@MHeqno{??\sublabeltype{MHCurrentCount}}}
	{\global\def\@MHeqno{\ref{\@mylabel}\sublabeltype{MHCurrentCount}}}
	}
\def\@MHUseLab#1{\@MHbuildlab{#1}\global\@useminilabtrue}
\def\minilab#1{\let\MHsavelabel=\label%
	\@MHUseLab{#1}\@ifundefined{MHused@#1}{\@makelabel{#1}}{\@uselabel{#1}}%
	\let\label=\MHsavelabel}

\newskip\MHcenter \MHcenter=0pt plus 1000pt minus 1000pt
\newskip\MHbig \MHbig=1000pt plus 0pt minus 1000pt
\newskip\@MHlineskip
\def\openup{\afterassignment\@penup\dimen@=}
\def\@penup{\advance\lineskip\dimen@
  \advance\baselineskip\dimen@
  \advance\lineskiplimit\dimen@}
\newif\ifdt@p
\def\displ@y{\global\dt@ptrue\openup\jot\m@th
  \everycr{\noalign{\ifdt@p \global\dt@pfalse \ifdim\prevdepth>-1000\p@
      \vskip-\lineskiplimit \vskip\normallineskiplimit \fi
      \else \vskip\@MHlineskip\penalty\interdisplaylinepenalty \fi}}}
\def\@lign{\tabskip\z@skip\everycr{}}%% restore inside \displ@y
\def\displaylines#1{\displ@y \tabskip\z@skip
  \halign{\hbox to\displaywidth{$\@lign\hfil\displaystyle##\hfil$}\crcr
    #1\crcr}}

\def\@MHcrl{{\ifnum0=`}\fi\@ifnextchar[{\@MHcrlwith}{\@MHcrlwith[\z@]}}
\def\@MHcrlwith[#1]{\ifnum0=`{\fi}\MH@dd@nds&\global\@MHlineskip=#1\cr}

\def\@MHcrb{{\ifnum0=`}\fi\@ifnextchar[{\@MHcrbwith}{\@MHcrbwith[\z@]}}
\def\@MHcrbwith[#1]{\ifnum0=`{\fi}\MH@dd@nds\global\@MHlineskip=#1\cr}

\def\@MHlabel#1{\global\@haslabtrue\global\def\@MHcurrentlabel{#1}}

\def\@MHwritelabel{\def\@currentlabel{\@MHeqno}%
	\if@left\kern\displaywidth\kern0.2truecm\else\kern0.2cm\fi%
	\MHsavelabel{\@MHcurrentlabel}%
	\if@left\kern-\displaywidth\kern-0.2truecm\else\kern-0.2cm\fi}

\def\@MHstep{\if@tag\else\if@useminilab\refstepcounter{MHCurrentCount}%
	\else\refstepcounter{equation}\fi\fi}
\def\@MHputnumber{\if@haslab\@MHstep\if@left\@MHwritelabel\fi%
        \hbox{\rm(\@MHeqno)}%
	\if@left\else\@MHwritelabel\fi%
	\fi\global\@haslabfalse}

\def\@saveMHComms{\@restoretag\let\MHsavecr=\\\let\\=\@MHcr\let\@saveref=\ref\let\ref=\@MHref%
	\let\MHsavelabel=\label\let\label=\@MHlabel\let\@MHsavemult\multicol%
	\let\multicol\@MHspan\let\@MHsavetext\text\let\text\hbox}
\def\@restoreMHComms{\let\\=\MHsavecr\let\label=\MHsavelabel\@MHreset\let\ref=\@saveref%
	\let\multicol\@MHsavemult\let\text\@MHsavetext}

%% Preamble commands
\def\MHpre@ne{\MHs@tr@m\hfil$\MH@lign\displaystyle{\MHsh@rp}$\tabskip\z@skip&%
	\MHdecrt@t$\MH@lign\displaystyle{{}\MHsh@rp}$}
\def\MHpretw@{\tabskip\z@skip&\hfil\MHdecrt@t$\MH@lign\displaystyle{\MHsh@rp}$%
	\tabskip\z@skip&\MHdecrt@t$\MH@lign\displaystyle{{}\MHsh@rp}$}
\def\MHprethr@@{\hfil\tabskip\MHcenter&\tabskip\z@skip\my@MHput{\MHsh@rp}\crcr}
\def\MHprethr@@notag{\hfil\tabskip\MHcenter\crcr}
\def\MHd@cr{\global\advance\MHrem@inc@ls by -1}

\def\@MHspan#1#2{\multispan{#1}\ifnum\MHrem@inc@ls<1\global\MHrem@inc@ls=\MHt@tc@ls
	\global\advance\MHrem@inc@ls by 1\fi%
	\global\advance\MHrem@inc@ls by -#1%
	{\hfill$\displaystyle{#2}$\hfill}}

%% Building the preamble
\newcount\MHC@ls
\newcount\MHt@tc@ls
\newcount\MHrem@inc@ls
\def\MH@ddonecol{\xdef\MHpre@mble{\MHpre@mble\MHpretw@}}
\def\MH@ddcols{\if\the\MHC@ls1\let\comm\relax\else%
	\global\advance\MHt@tc@ls by 2%
	\MH@ddonecol\advance\MHC@ls by -1%
	\let\comm\MH@ddcols\fi\comm}
\def\MHm@kepre@mble#1{
	\if#10
	\global\MHt@tc@ls=0
	\xdef\MHpre@mble{\MHs@tr@m\hfil$\MH@lign\displaystyle{\MHsh@rp}$\MHpre@nd}
	\else
	\MHC@ls=#1
	\global\MHt@tc@ls=1
	\xdef\MHpre@mble{\MHpre@mble\MHpre@ne}
	\MH@ddcols
	\xdef\MHpre@mble{\MHpre@mble\MHpre@nd}
	\fi
	}

%% Build enough & signs to fill up the box
\def\MHm@ke@nds{\if\the\MHrem@inc@ls0\let\comm\relax\else%
	\xdef\MH@nds{\MH@nds &}\global\advance\MHrem@inc@ls by -1%
	\let\comm\MHm@ke@nds%
	\fi\comm}
\def\MH@dd@nds{\def\MH@nds{}\MHm@ke@nds\MH@nds}
\def\MHr@mto@ne{\global\MHrem@inc@ls=\MHt@tc@ls}

\def\MH@initone{\gdef\MHpre@mble{}
	\let\MH@restoretag\relax\let\MHsh@rp\relax\let\MH@lign\relax
	\let\my@MHput\relax\let\MHdecrt@t\relax\let\MHs@tr@m\relax%\let\@MHfill\relax
	}
\def\MH@inittwo{\let\MH@restoretag\@restoretag\let\MHsh@rp##\let\MH@lign\@lign
	\let\my@MHput\@MHput@lbl\let\MHdecrt@t\MHd@cr\let\MHs@tr@m\MHr@mto@ne%\let\@MHfill\my@fill
	\MHpre@mble
	}

\def\@newalign#1{\displ@y\tabskip\MHcenter
	\MH@initone
	\let\MHpre@nd\MHprethr@@
	\MHm@kepre@mble{#1}
	\xdef\MHpre@mble{\halign to\displaywidth\bgroup\MH@restoretag\MHpre@mble}
	\MH@inittwo
	}  
\def\@newbalign#1{\vcenter\bgroup\displ@y\tabskip\MHcenter
	\MH@initone
	\let\MHpre@nd\MHprethr@@notag
	\MHm@kepre@mble{#1}
	\xdef\MHpre@mble{\halign to\displaywidth\bgroup\MHpre@mble}
	\MH@inittwo
	}  
	    

\def\@begalign[#1]{\global\let\@MHcr\@MHcrl$$\@saveMHComms\@newalign{#1}}

\def\@ealign{\@MHcr\egroup}

\def\@restoretag{\if@tag\global\@tagfalse\global\let\@MHeqno=\@MHsaveno\fi}
\def\tag#1{\global\@tagtrue\global\let\@MHsaveno=\@MHeqno\global\def\@MHeqno{#1}}

\def\@equnolabel{\global\@haslabfalse}
\def\@equlabel[#1]{\label{#1}\global\@haslabtrue}

\def\@ealignb{\@MHcr\egroup\egroup}
  
\def\@equbopt[#1]{\computelength{#1}\ifnum\@MHLength=1\@nocols=#1\else
	\label{#1}\global\@haslabtrue\fi
	\@ifnextchar[{\@equbopt}{\@equb}}
\def\@equb{\@newbalign{\the\@nocols}}

\def\equa{\global\let\@MHcr\@MHcrb$$\@saveMHComms\global\@nocols=1%
	\@ifnextchar[{\@equbopt}{\@equb}}
\def\endequa{\@ealignb\if@haslab\@MHput@lbl{}\fi%
	\@restoreMHComms$$\global\@ignoretrue}

\def\equ{$$\@saveMHComms\@ifnextchar[\@equlabel\@equnolabel}
\def\endequ{\if@haslab\if@left\leqno{\@MHputnumber}\else\eqno{\@MHputnumber}\fi\fi%
	\@restoreMHComms$$\global\@ignoretrue}

\def\equs{\@ifnextchar[{\@begalign}{\@begalign[1]}}
\def\endequs{\@ealign\@restoreMHComms$$\global\@ignoretrue}

\def\setlabtype#1{\global\expandafter\let\expandafter\sublabeltype\csname #1\endcsname}

\@MHreset
\let\sublabeltype=\alph
\def\intertext#1{\noalign{\noindent#1}}

\def\strutdepth{0pt}
\def\@MHmargin#1{\strut\vadjust{\kern-\strutdepth\@MHspecial{#1}}}
\def\@MHspecial#1{\vtop to \strutdepth{\baselineskip\strutdepth\vss\llap{#1}\null}}

\let\MHgobble\@gobblecr