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
|
%%
%% longmath.sty is part of longmath version 1.0.
%%
%% (c) 2024 Hans-Jürgen Matschull
%%
%% 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.
%% 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.
%%
%% This work has the LPPL maintenance status 'maintained'.
%%
%% The Current Maintainer of this work is Hans-Jürgen Matschull
%%
%% see README for a list of files belonging to longmath.
%%
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{longmath}[2024/07/04]
\RequirePackage{luatexbase}
% generic attribute used to mark special objects and send mathstyle to Lua.
\newattribute\longmath@info
% attribute to tag large operators.
\newattribute\longmath@limits
\def\ignorelimits{\setattribute{\longmath@limits}{1}}
\def\includelimits{\unsetattribute{\longmath@limits}}
% Save original primitives.
\let \longmath@left \left
\let \longmath@middle \middle
\let \longmath@right \right
\directlua{ require( 'longmath.lua' ) }
% Registers.
\newcount\delimiterscale \delimiterscale 902
\newdimen\longmathlinesep \longmathlinesep 3pt
\newif\iflongmath@star
\newcount\longmath@lines
\newdimen\longmath@extra
\newdimen\longmath@width
\newcount\longmath@xscale
\newcount\longmath@yscale
\newbox\longmath@box
% The prefix for tags.
\def\longmath@prefix{}
\def\delimiterprefix#1{\def\longmath@prefix{#1}}
% User macros
\def\lleft {\longmath@delimA \mathopen {1000}{opn}}
\def\rright {\longmath@delimA \mathclose {1000}{cls}}
\def\mleft {\longmath@delimA \mathopen {1000}{mid}}
\def\mright {\longmath@delimA \mathclose {1000}{mid}}
\def\mmord {\longmath@delimA \mathord \delimiterscale {mid}}
\def\mmbin {\longmath@delimA \mathbin \delimiterscale {mid}}
\def\mmrel {\longmath@delimA \mathrel \delimiterscale {mid}}
\def\mmpunct{\longmath@delimA \mathpunct \delimiterscale {mid}}
\def\mmiddle{\longmath@delimA \mathinner \delimiterscale {mid}}
\def\mmop {\longmath@delimA \mathop \delimiterscale {mid}}
% This sets the math atom type, the default scale factor, and the command to be send to Lua,
% then checks if a tag in {} is following.
\def\longmath@delimA #1#2#3{\begingroup
\let\longmath@type #1 \longmath@xscale = #2 \relax \edef\longmath@comm{#3}
\futurelet \longmath@token \longmath@delimB }
% If a tag is following, read it. Otherwise, skip this step.
\def\longmath@delimB{\ifx\longmath@token\bgroup \expandafter \longmath@delimC
\else \expandafter \longmath@delimD \fi }
% Read the tag, prepend the prefix and append a @, then add it to the command.
\def\longmath@delimC #1{\edef\longmath@comm{\longmath@comm:\longmath@prefix#1@} \longmath@delimD }
% Read the optional scale factor. If none is given, the scale is set to 0.
\def\longmath@delimD #1{\afterassignment\longmath@delimE \longmath@yscale = 0#1}
% This creates a \special whatsit with the command as string argument, followed by
% a fake delimiter group with the requested delimiter always being the right one.
% For the delimiter nodes, the info attribute is set to the current math style.
% For the empty \hbox, it is set to the requested scale factor.
\def\longmath@delimE{
\setattribute\longmath@info{\mathstyle} \special{\longmath@comm}
\longmath@type\bgroup \longmath@left . \aftergroup\egroup \aftergroup\endgroup
\begingroup \setattribute\longmath@info{\ifnum \longmath@yscale < 1 \longmath@xscale \else \longmath@yscale \fi}
\hbox{} \endgroup \longmath@right }
% magic number to identify the variable delimiter.
\delcode`* = "FEFEFE %"
% scanner to read the delimiter sample and create a nested \left-\right-group.
\def\longmath@autoL #1#2\relax{\ifx *#1 \longmath@autoR #2\relax
\else \longmath@left #1 \longmath@autoL #2\relax \fi }
\def\longmath@autoR #1#2\relax{\ifx *#1
\else \longmath@right #1 \longmath@autoR #2\relax \fi}
% Read the sample provided by the user, insert a set command, and typeset it into a box.
\def\autodelimiters #1{\begingroup \longmath@info = 0
\setbox\longmath@box\hbox{$ \special{set} \longmath@autoL #1***\relax $}
\endgroup\aftergroup\longmath@autoreset}
% To make the setting local to the current TeX group, send a reset command at the end of the group.
\def\longmath@autoreset{\begingroup \longmath@info = 0
\setbox\longmath@box\hbox{$ \special{res} {} $}
\endgroup}
% Counter for automatic tag generation.
\newcount\longmath@tagnum
% Stack to store pushed tags, separated by spaces.
\def\longmath@stack{}
% Create a unique tag.
\def\longmath@unique{
\global\advance\longmath@tagnum\@ne
\global\edef\longmath@stack{@\the\longmath@tagnum\space\longmath@stack}
}
% Create an invisible closing delimiter.
\def\pushdelimiter{\longmath@unique
\expandafter\longmath@push\longmath@stack\relax}
\def\longmath@push #1 #2\relax{\ifmmode\begingroup
\def\longmath@comm{mid:#1} \let\longmath@type\mathclose \longmath@yscale=1\relax
\longmath@delimE . \fi}
% Create an invisible opening delimiter.
\def\pulldelimiter{\ifx\longmath@stack\empty \longmath@unique \fi
\expandafter\longmath@pull\longmath@stack\relax}
\def\longmath@pull #1 #2\relax{\global\edef\longmath@stack{#2}\ifmmode\begingroup
\def\longmath@comm{mid:#1} \let\longmath@type\mathopen \longmath@yscale=1\relax
\longmath@delimE . \fi}
% Read width argument for the longmath environment.
% Expects to numbers or dimensions terminted by +.
% Numbers are multplied by \hsize.
\def\longmath@gobble #1\relax{}
\def\longmath@setwidth #1+#2+#3\relax{
\afterassignment\longmath@gobble \longmath@width = #1 \hsize \relax
\afterassignment\longmath@gobble \longmath@extra = #2 \hsize \relax }
% Alignment for the longmath box.
\let\longmath@align@t@\vtop
\let\longmath@align@b@\vbox
\let\longmath@align@c@\vcenter
% Save and restore the current math style.
\newcount\longmath@style
\def\longmath@getstyle{\longmath@style = \mathstyle \relax}
\def\longmath@setstyle{\ifcase\longmath@style \relax \displaystyle \or \crampeddisplaystyle \or
\textstyle \or \crampedtextstyle \or \scriptstyle \or \crampedscriptstyle \or
\scriptscriptstyle \or \crampedscriptscriptstyle \else \textstyle \fi }
% Begin of longmath environment.
% Set alignment and width and save the current math style.
% Then start a horizontal box in math mode.
\def\longmath@begin #1#2{\begingroup
\expandafter\let\expandafter\longmath@align\csname longmath@align@#1@\endcsname
\ifx \longmath@align\relax \let\longmath@align\longmath@align@c@ \fi
\longmath@getstyle \longmath@setwidth #2+0+\relax
%\rlap{\textcolor{green}{\rule{\longmath@width}{0.1pt}}\textcolor{yellow}{\rule{\longmath@extra}{0.1pt}}}
\setbox\longmath@box\hbox\bgroup $ \mathpenaltiesmode = 1 \longmath@setstyle
}
% End of longmath environment.
% If the width of the box is smaller than the requested width, just use it as is.
% Otherwise, modify the requested width if the * version was used.
% Then \unhbox the content into a paragraph with the requested width.
% \box0 and \box1 are used to adapt the baselineskip to the math style.
% \leftskip and \rightskip are set such that lines are centered but not justified.
% The glue is removed from the beginning of the first line with \hskip,
% and from the end of the last line with \parfilskip.
% If \longmath@extra is non-zero, Lua will stack the lines of the paragraph.
\def\longmath@end{$\egroup
\ifdim \wd\longmath@box < \dimexpr \longmath@width + \longmath@extra \relax
\longmath@extra = \z@
\box\longmath@box
\else
\iflongmath@star
\longmath@lines = \dimexpr ( 1.1\wd\longmath@box + 0.5\longmath@width ) / \longmath@width \relax
\longmath@width = \dimexpr ( 1.1\wd\longmath@box / \longmath@lines )
\fi
\setbox0\hbox{$1$}
\setbox1\hbox{$\longmath@setstyle 1$}
\longmath@align{\hsize\longmath@width
\baselineskip \dimexpr \baselineskip * \ht1 / \ht0 \relax \lineskip\z@ \lineskiplimit\z@
\openup \longmathlinesep
\leftskip 0pt plus 0.6\longmath@width
\rightskip 0pt plus 0.6\longmath@width
\parfillskip-\rightskip \noindent\hskip-\leftskip \unhbox\longmath@box}
\longmath@extra = \z@
\fi \endgroup
}
\newenvironment{longmath}[2][c]
{\longmath@starfalse\longmath@begin{#1}{#2}}{\longmath@end}
\newenvironment{longmath*}[2][c]
{\longmath@startrue\longmath@begin{#1}{#2}}{\longmath@end}
% Read the dimensions of tagged groups from the aux file.
\def\longmath@group#1#2{\directlua{longmath.read_group({#1},{#2})}}
\def\longmath@skip#1#2{}
% Save the dimensions of the tagged groups at the end of the document.
\def\longmath@save{\let\longmath@group\longmath@skip\directlua{longmath.save_groups(\the\@auxout)}}
\AtEndDocument{\longmath@save}
|
