summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/source/latex/eqparbox/eqparbox.dtx
blob: 3a91ea1b2e5371b715c3e7e9e824ef18f08414d5 (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
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
% \iffalse meta-comment
%
% Copyright (C) 2013 Scott Pakin <scott+eqp@pakin.org>
% ----------------------------------------------------
%
% This package may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3c
% 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 1.3c or later is part of all distributions of LaTeX
% version 2008/05/04 or later.
%
% \fi
%
% \iffalse
%<*driver>
\ProvidesFile{eqparbox.dtx}
%</driver>
%<package>\NeedsTeXFormat{LaTeX2e}[1999/12/01]
%<package>\ProvidesPackage{eqparbox}
%<*package>
    [2013/03/15 v4.0 Create equal-widthed boxes]
%</package>
%
%<*driver>
\documentclass{ltxdoc}
\usepackage{eqparbox}
\usepackage{calligra}
\usepackage{array}
\usepackage{boxedminipage}
\usepackage{needspace}
\usepackage{ifmtarg}
\usepackage[subrefformat=parens,labelformat=parens]{subfig}
\usepackage[bookmarksopen]{hyperref}
\EnableCrossrefs
\CodelineIndex
\RecordChanges

% Uncomment the following line if you don't want to include a
% source-code listing.
%\OnlyDescription

\begin{document}
  \sloppy
  \DocInput{eqparbox.dtx}
  \Needspace{10\baselineskip}
  \phantomsection\addcontentsline{toc}{section}{Change History}
  \PrintChanges
  \makeatletter
  \let\orig@index@prologue=\index@prologue
  \def\index@prologue{%
    \phantomsection\addcontentsline{toc}{section}{Index}
    \orig@index@prologue
  }%
  \makeatother
  \Needspace{12\baselineskip}
  \PrintIndex
\end{document}
%</driver>
% \fi
%
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% \CheckSum{474}
%
% \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}{2001/04/19}{Initial version}
% \changes{v2.0}{2004/07/31}{Rewrote to use only two \meta{dimen}s total
%   and the rest macros (problem reported by Gilles P\'erez-Lambert and
%   Plamen Tanovski; solution suggested by David Kastrup and Donald
%   Arseneau)}
%
% \GetFileInfo{eqparbox.dtx}
%
% \DoNotIndex{\\}
% \DoNotIndex{\@auxout,\@cons,\@ifnextchar,\@ifundefined,\@ne}
% \DoNotIndex{\@tempdima,\@tempboxa}
% \DoNotIndex{\advance,\begin,\begingroup,\bgroup,\box}
% \DoNotIndex{\csname,\DeclareRobustCommand,\def}
% \DoNotIndex{\egroup,\else,\end,\endcsname,\endgroup,\expandafter}
% \DoNotIndex{\fi,\gdef,\global}
% \DoNotIndex{\hbox,\ifdim,\ifx,\immediate,\let,\m@ne,\mbox}
% \DoNotIndex{\newcommand,\newdimen,\newif,\newlength,\noexpand}
% \DoNotIndex{\relax,\romannumeral}
% \DoNotIndex{\sbox,\setbox,\space,\string,\the,\wd,\xdef,\z@}
%
% ^^A  The following environment, which typesets a declaration of a command
% ^^A  in a box set out into the margin, was copied almost verbatim from
% ^^A  ltxguide.cls.
% \newenvironment{decl}[1][]^^A
%     {\par\small\addvspace{4.5ex plus 1ex}^^A
%      \vskip -\parskip
%      \ifx\relax#1\relax
%         \def\@decl@date{}^^A
%      \else
%         \def\@decl@date{\NEWfeature{#1}}^^A
%      \fi
%      \noindent\hspace{-\leftmargini}^^A
%      \begin{tabular}{|l|}\hline\ignorespaces}^^A
%     {\\\hline\end{tabular}\nobreak\@decl@date\par\nobreak
%      \vspace{2.3ex}\vskip -\parskip}
%
% ^^A  Define a style for typesetting package names.
% \DeclareRobustCommand{\pkgname}[1]{^^A
%   \textsf{#1}\index{#1=\textsf{#1} (package)}}
%
% ^^A  Give LaTeX some more leeway in placing floats
% ^^A  (suggested by Donald Arseneau <asnd@triumf.ca>).
% \renewcommand{\topfraction}{0.85}
% \renewcommand{\bottomfraction}{0.7}
% \renewcommand{\textfraction}{0.15}
% \renewcommand{\floatpagefraction}{0.66}
% \renewcommand{\dbltopfraction}{0.66}
% \renewcommand{\dblfloatpagefraction}{0.66}
% \setcounter{topnumber}{9}
% \setcounter{bottomnumber}{9}
% \setcounter{totalnumber}{20}
% \setcounter{dbltopnumber}{9}
%
% ^^A  Because we put table captions *above* tables, we should add a
% ^^A  little extra space between the caption and the table.
% \setlength{\belowcaptionskip}{2ex}
%
% ^^A  Properly hyphenate Rob Verhoeven's name.
% \hyphenation{Ver-hoe-ven}
%
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% \title{The \pkgname{eqparbox} package\thanks{This document
%   corresponds to \pkgname{eqparbox}~\fileversion, dated \filedate.}}
% \author{Scott Pakin \\ \textit{scott+eqp@pakin.org}}
% \hypersetup{^^A
%   pdftitle={The eqparbox package},
%   pdfauthor={Scott Pakin <scott+eqp@pakin.org>},
%   pdfsubject={LaTeX package for typesetting text in equal-widthed boxes},
%   pdfkeywords={LaTeX2e, parbox, makebox, framebox, savebox, boxes, automatic width, largest}
% }
%
% \maketitle
%
% \begin{abstract}
%   The \pkgname{eqparbox} package makes it easy to define a group of
%   boxes (such as those produced by |\parbox| or |\makebox|) whose
%   members all have the same width, the natural width of the widest
%   member.  A document can contain any number of groups, and each group
%   can contain any number of members.  This simple, equal-width
%   mechanism can be used for a variety of alignment purposes, as is
%   evidenced by the examples in this document.
% \end{abstract}
%
% \section{Motivation}
% \label{sec:motivation}
%
% Let's start with a little test.  How would you typeset
% Figure~\ref{fig:quotations}, in which the names of the quotations'
% authors are left-justified relative to each other but as a group abut
% the right margin?  And second, how would you typeset the r\'esum\'e
% excerpt shown in Figure~\ref{fig:resume-excerpt} while meeting the
% following requirements:
%
% \begin{enumerate}
%   \item The header columns must be left-justified relative to each
%         other.
%   \item The header columns should be evenly spaced across the page.
%   \item Page breaks should be allowed within the r\'esum\'e.
% \end{enumerate}
%
% \begin{figure}[htbp]
%   \centering
%   \makeatletter
%   \newcommand{\showquote}[2]{^^A
%     \begin{flushright}
%       ---~\eqparbox{quotebox}{\sffamily#1}^^A
%       \@ifnotmtarg{#2}{\\
%         \mbox{}\phantom{---}~\eqparbox{quotebox}{\sffamily\itshape#2}^^A
%       }^^A
%     \end{flushright}^^A
%     \par
%   }
%   \makeatother
%   \begin{boxedminipage}{\linewidth}
%     The only medicine for suffering, crime, and all other woes of mankind,
%     is wisdom. Teach a man to read and write, and you have put into his
%     hands the great keys of the wisdom box. But it is quite another thing
%     to open the box.
%     \showquote{Thomas Huxley}{}
%
%     I would like a simple life \\
%     yet all night I am laying \\
%     poems away in a long box. \par
%     \bigskip
%     It is my immortality box, \\
%     my lay-away plan, \\
%     my coffin.
%     \showquote{Anne Sexton}{The Ambition Bird}
%
%     \bigskip
%
%     We have four boxes with which to defend our freedom: the soap box, the
%     ballot box, the jury box, and the cartridge box.
%     \showquote{Larry McDonald}{}
%
%     \bigskip
%
%     I saw the Count lying within the box upon the earth, some of which the
%     rude falling from the cart had scattered over him. He was deathly
%     pale, just like a waxen image, and the red eyes glared with the
%     horrible vindictive look which I knew so well.
%     \showquote{Bram Stoker}{Dracula}
%
%     \bigskip
%
%     Life in a box is better than no life at all, I expect. You'd
%     have a chance, at least. You could lie there thinking, ``Well,
%     at least I'm not dead.''
%     \showquote{Tom Stoppard}{Rosencrantz~\& Guildenstern Are Dead}
%
%     \bigskip
%
%     Alla fin del gioco tanto va nel sacco il re quanto la pedina. \\
%     \textit{(After the game, the king and pawn go into the same box.)}
%     \showquote{Italian proverb}{}
%   \end{boxedminipage}
%   \caption{Quotations with left-aligned attributions}
%   \label{fig:quotations}
% \end{figure}
%
% \begin{figure}[htbp]
% \bigskip\noindent\rule{\linewidth}{1pt}\bigskip\par
% \noindent
% \eqparbox{place}{\textbf{Widgets, Inc.}} \hfill
% \eqparbox{title}{\textbf{Senior Widget Designer}} \hfill
% \eqparbox{dates}{\textbf{1/95--present}}
%
% \begin{itemize}
%   \item Supervised the development of the new orange and blue widget lines.
%   \item Improved the design of various widgets, making them less sticky
%         and far less likely to explode.
%   \item Made widget management ten times more cost-effective.
% \end{itemize}
%
% \noindent
% \eqparbox{place}{\textbf{Thingamabobs, Ltd.}} \hfill
% \eqparbox{title}{\textbf{Lead Engineer}} \hfill
% \eqparbox{dates}{\textbf{9/92--12/94}}
%
% \begin{itemize}
%   \item Found a way to make thingamabobs run on solar power.
%   \item Drafted a blueprint for a new doohickey-compatibility module for
%         all cool-mint thingamabobs.
%   \item Upgraded superthingamabob specification document from Microsoft
%         Word to \LaTeXe.
% \end{itemize}
% \noindent\rule{\linewidth}{1pt}
% \caption{Excerpt from a sample r\'esum\'e}
% \label{fig:resume-excerpt}
% \end{figure}
%
% The two questions can be answered the same way: by putting various
% blocks of text into equal-widthed boxes.  If the author names in
% Figure~\ref{fig:quotations} are placed within a |flushright|
% environment and in |\parbox|es as wide as the widest text
% (``Rosencrantz~\& Guildenstern Are Dead''), they will appear as
% desired.  Similarly, if the company names in
% Figure~\ref{fig:resume-excerpt} are both put in a |\parbox| as wide as
% ``Thingamabobs, Ltd.,'' the job titles in a |\parbox| as wide as
% ``Senior Widget Designer,'' and the dates in a |\parbox| as wide as
% ``1/95--present,'' then they can be spaced evenly by separating them
% with |\hfill|s.
%
% The problem is in choosing the width for each set of |\parbox|es.
% Considering for now just Figure~\ref{fig:resume-excerpt}, the user
% must typeset the r\'esum\'e once to see which entry in each column is
% the widest and then assign lengths appropriately:
%
% \begin{verbatim}
%     \newlength{\placewidth}
%     \settowidth{\placewidth}{Thingamabobs, Ltd.}         % Employment 2
%     \newlength{\jobtitlewidth}
%     \settowidth{\jobtitlewidth}{Senior Widget Designer}  % Employment 1
%     \newlength{\dateswidth}
%     \settowidth{\dateswidth}{1/95--present}              % Employment 1
% \end{verbatim}
%
% \noindent
% Every time a piece of information changes, it must be changed in two
% places: in the r\'esum\'e itself and in the |\settowidth|
% command.  When employment information is added or deleted, the
% |\settowidth| commands must be modified to reflect the new
% maximum-widthed entry in each column.  If only there were a simpler
% way to keep a set of |\parbox|es as wide as the widest entry in the
% set\,\dots
%
% That simpler way is the \pkgname{eqparbox} package.
% \pkgname{eqparbox} exports an |\eqparbox| macro that works just like
% |\parbox|, except that instead of specifying the width of the box, one
% specifies the group that the box belongs to.  All boxes in the same
% group will be typeset as wide as the widest member of the group.  In
% that sense, an |\eqparbox| behaves like a cell in an~|l|, |c|, or~|r|
% column in a |tabular|; |\eqparbox|es in the same group are analogous
% to cells in the same column.  Unlike the cells in a |tabular| column,
% however, a group of |\eqparbox|es can be spread throughout the
% document.
%
% \section{Usage}
% \label{sec:usage}
%
% \begin{decl}
%   |\eqparbox| \oarg{pos} \oarg{height} \oarg{inner-pos} \marg{tag} \marg{text} \\
%   |\eqmakebox| \oarg{tag} \oarg{pos} \marg{text} \\
%   |\eqframebox| \oarg{tag} \oarg{pos} \marg{text} \\
%   |\eqsavebox| \marg{cmd} \oarg{tag} \oarg{pos} \marg{text} \\[1ex]
%   |\begin{eqminipage}| \oarg{pos} \oarg{height} \oarg{inner-pos} \marg{tag} \\
%   \quad \meta{text} \\
%   |\end{eqminipage}|
% \end{decl}
%
% These are almost identical to, respectively, the |\parbox|,
% |\makebox|, |\framebox|, and |\savebox| macros and the |minipage|
% environment.  The key difference is that the \meta{width} argument is
% replaced by a \meta{tag} argument.  (For a description of the
% remaining arguments, look up |\parbox|, |\makebox|, |\framebox|,
% |\savebox|, and |minipage| in any \LaTeXe\ book or in the
% \texttt{usrguide.pdf} file that comes with all \TeX\ distributions.)
% \meta{tag} can be any valid identifier.  All boxes produced using the
% same tag are typeset in a box wide enough to hold the widest of them.
% Discounting \TeX's limitations, any number of tags can be used in the
% same document, and any number of boxes can share a tag.  The only
% catch is that \texttt{latex} will need to be run a second time for the
% various box widths to stabilize.
%
% \begin{decl}
% |\eqboxwidth|
% \end{decl}
%
% It is sometimes useful to take the width of a box produced by one of
% the preceding commands.  While the width can be determined by creating
% an |\eqparbox| and using |\settowidth| to measure it, the
% \pkgname{eqparbox} package defines a convenience routine called
% |\eqboxwidth| that achieves the same result.
%
% |\eqboxwidth| makes it easy to typeset something like
% Table~\ref{tbl:mixed-tabular}.  Table~\ref{tbl:mixed-tabular}'s only
% column expands to fit the widest cell in the column, excluding the
% final cell.  The final cell's text word-wraps within whatever space is
% allocated to it.  In a sense, the first four cells behave as if they
% were typeset in an~|l| column, while the final cell behaves as if it
% were typeset in a~|p| column.  In actuality, the column is an~|l|
% column; an |\eqparbox| for the first four cells ensures the column
% stretches appropriately while a |\parbox| of width
% |\eqboxwidth{|\meta{tag}|}| in the final cell ensures that the final
% cell word-wraps.
%
% Section~\ref{sec:tabular-l-p} presents a more general version of this
% approach that doesn't require cells to be divided explicitly into
% |\eqparbox| cells and |\parbox| cells.
%
% \begin{table}[htbp]
% \centering
% \caption{A \texttt{tabular} that stretches to fit some cells while
% forcing others to wrap}
% \label{tbl:mixed-tabular}
% \DeleteShortVerb{\|}
% \begin{tabular}{|@{}l@{}|}
%   \hline
%   \eqparbox[b]{wtab}{Wide} \\ \hline
%   \eqparbox[b]{wtab}{Wider} \\ \hline
%   \eqparbox[b]{wtab}{Wider than that} \\ \hline
%   \eqparbox[b]{wtab}{This is a fairly wide cell} \\ \hline
%   \parbox[b]{\eqboxwidth{wtab}}{\strut
%     While this cell's text wraps, the previous cells (whose text
%     doesn't wrap) determine the width of the column.} \\ \hline
% \end{tabular}
% \MakeShortVerb{\|}
% \end{table}
%
% \begin{decl}
%   |\eqsetminwidth| \marg{tag} \marg{width} \\
%   |\eqsetmaxwidth| \marg{tag} \marg{width}
% \end{decl}
%
% These macros override the width calculation for boxes associated with
% tag \meta{tag}, ensuring that they are no narrower than a given
% minimum (|\eqsetminwidth|) and no wider than a given maximum
% (|\eqsetmaxwidth|).
%
% \begin{decl}
%   |\eqsetminwidthto| \marg{tag} \marg{text} \\
%   |\eqsetmaxwidthto| \marg{tag} \marg{text}
% \end{decl}
%
% These macros are analogous to |\eqsetminwidth| and |\eqsetmaxwidth|
% but automatically compute the natural width of the given text and use
% that as the minimum (|\eqsetminwidthto|) or maximum
% (|\eqsetmaxwidthto|) width for boxes using tag \meta{tag}.
%
%
% \section{Examples}
% \label{sec:examples}
%
% This section presents some sample uses of the macros described in
% Section~\ref{sec:usage}.
%
% \subsection{Figures and tables from previous sections}
% \label{sec:prev-figs-tabs}
%
% Figure~\ref{fig:quotations} was typeset using an |\eqparbox|-based
% helper macro, |\showquote|:
%
% \begin{verbatim}
%     \usepackage{ifmtarg}
%     \makeatletter
%     \newcommand{\showquote}[2]{%
%       \begin{flushright}
%         ---~\eqparbox{quotebox}{\sffamily#1}%
%         \@ifnotmtarg{#2}{\\
%           \mbox{}\phantom{---}~\eqparbox{quotebox}{\sffamily\itshape#2}%
%         }%
%       \end{flushright}%
%       \par
%     }
%     \makeatother
% \end{verbatim}
% \centerline{$\vdots$}
% \begin{verbatim}
%     Alla fin del gioco tanto va nel sacco il re quanto la pedina. \\
%     \textit{(After the game, the king and pawn go into the same box.)}
%     \showquote{Italian proverb}{}
% \end{verbatim}
%
% Figure~\ref{fig:resume-excerpt}'s headings were typeset with the
% following code:
%
% \begin{verbatim}
%     \noindent
%     \eqparbox{place}{\textbf{Widgets, Inc.}} \hfill
%     \eqparbox{title}{\textbf{Senior Widget Designer}} \hfill
%     \eqparbox{dates}{\textbf{1/95--present}}
% \end{verbatim}
% \centerline{$\vdots$}
% \begin{verbatim}
%     \noindent
%     \eqparbox{place}{\textbf{Thingamabobs, Ltd.}} \hfill
%     \eqparbox{title}{\textbf{Lead Engineer}} \hfill
%     \eqparbox{dates}{\textbf{9/92--12/94}}
% \end{verbatim}
% \centerline{$\vdots$}
% \bigskip
%
% Finally, Table~\ref{tbl:mixed-tabular} was typeset using the
% following code:
%
% \begin{verbatim}
%     \begin{tabular}{|@{}l@{}|}
%       \hline
%       \eqparbox[b]{wtab}{Wide} \\ \hline
%       \eqparbox[b]{wtab}{Wider} \\ \hline
%       \eqparbox[b]{wtab}{Wider than that} \\ \hline
%       \eqparbox[b]{wtab}{This is a fairly wide cell} \\ \hline
%       \parbox[b]{\eqboxwidth{wtab}}{\strut
%         While this cell's text wraps, the previous cells (whose text
%         doesn't wrap) determine the width of the column.} \\ \hline
%     \end{tabular}
% \end{verbatim}
%
% \subsection{Lists within \texttt{tabular}s}
% \label{sec:lists-tabulars}
%
% List environments (|itemize|, |enumerate|, etc.) cannot appear
% directly within a |tabular| cell.  Instead, they must be wrapped
% within a |\parbox|.  The problem is that the |\parbox| width must be
% specified; it can't be determined automatically.  Fortunately, as of
% version~4.0 of \pkgname{eqparbox}, the |\eqparbox| macro can contain
% list environments, and these are automatically sized to their widest
% item, just like any other |\eqparbox| contents.
% Table~\ref{tbl:lists-tabular} presents an example of |enumerate| lists
% appearing within |tabular| cells.  The code for this is
% straightforward, thanks to \pkgname{eqparbox}:
%
% \begin{table}[tbp]
%   \centering
%   \caption{Lists within a \texttt{tabular}}
%   \label{tbl:lists-tabular}
%   \begin{tabular}{c|c}
%     \textbf{Meeting date} & \textbf{Topics discussed} \\
%     \hline
%     2013-02-22
%     & \eqparbox{topiclist}{^^A
%         \begin{enumerate}
%           \item Hardware upgrades
%           \item Barbara's retirement
%           \item Revised 27B/6 paperwork
%         \end{enumerate}
%       }^^A
%     \\ \hline
%     2013-03-01
%     & \eqparbox{topiclist}{^^A
%         \begin{enumerate}
%           \item Printer low on toner
%           \item Message from the V.P.
%         \end{enumerate}
%     }^^A
%     \\ \hline
%     2013-03-08
%     & \eqparbox{topiclist}{^^A
%         \begin{enumerate}
%           \item Product to ship next week
%           \item Floors to be recarpeted
%           \item Too many meetings
%         \end{enumerate}
%       }^^A
%   \end{tabular}
% \end{table}
%
% \begin{verbatim}
%     2013-02-22 & \eqparbox{topiclist}{%
%                    \begin{enumerate}
%                      \item Hardware upgrades
%                      \item Barbara's retirement
%                      \item Revised 27B/6 paperwork
%                    \end{enumerate}
%                   } \\ \hline
% \end{verbatim}
%
% \subsection{Hanging indentation}
% \label{sec:hang-indent}
%
% Consider the paragraphs depicted in Figure~\ref{fig:hang-indent}.
% We'd like the paragraph labels set on the left, as shown, but we'd
% also like to allow both intra-~and inter-paragraph page breaks.  Of
% course, if the labels are made wider or narrower, we'd like the
% paragraph widths to adjust automatically.  By using a custom |list|
% environment that typesets its labels with |\eqparbox| this is fairly
% straightforward:
%
% \begin{verbatim}
%     \begin{list}{}{%
%       \renewcommand{\makelabel}[1]{\eqparbox[b]{listlab}{#1}}%
%       \setlength{\labelwidth}{\eqboxwidth{listlab}}%
%       \setlength{\labelsep}{2em}%
%       \setlength{\parsep}{2ex plus 2pt minus 1pt}%
%       \setlength{\itemsep}{0pt}%
%       \setlength{\leftmargin}{\labelwidth+\labelsep}%
%       \setlength{\rightmargin}{0pt}}
%
%       \item[Stuff about me]  I am great.  Blah, blah, blah, ...
%
%       \item[More stuff]  I am wonderful.  Blah, blah, blah, ...
%
%       \item[The final exciting thing]  I am fantastic.  Blah,
%          blah, blah, ...
%     \end{list}
% \end{verbatim}
%
% \begin{figure}[htbp]
% \rule{\linewidth}{1pt}
% \begin{list}{}{^^A
%   \renewcommand{\makelabel}[1]{\eqparbox[b]{listlab}{#1}}^^A
%   \setlength{\labelwidth}{\eqboxwidth{listlab}}^^A
%   \setlength{\labelsep}{2em}^^A
%   \setlength{\parsep}{2ex plus 2pt minus 1pt}^^A
%   \setlength{\itemsep}{0pt}^^A
%   \setlength{\leftmargin}{\labelwidth}^^A
%   \addtolength{\leftmargin}{\labelsep}^^A
%   \setlength{\rightmargin}{0pt}}
%
%   \item[Stuff about me] I am great.  Blah, blah, blah, blah, blah,
%   blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah,
%   blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah,
%   blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah,
%   blah.
%
%   \item[More stuff] I am wonderful.  Blah, blah, blah, blah, blah,
%   blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah,
%   blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah,
%   blah.
%
%   Did I mention that blah, blah, blah, blah, blah, blah, blah, blah,
%   blah, blah, blah, blah, blah, blah, blah?
%
%   \item[The final exciting thing] I am fantastic.  Blah, blah, blah,
%   blah, blah, blah, blah, blah, blah, blah, blah, blah, blah, blah,
%   blah, blah, blah, blah, blah, blah, blah, blah, blah.
% \end{list}
% \rule{\linewidth}{1pt}
% \caption{Paragraphs with hanging indentation}
% \label{fig:hang-indent}
% \end{figure}
%
% \subsection{Justified, parallel text}
% \label{sec:parallel-text}
%
% Consider line-by-line transcription of a piece of text as illustrated
% by the mockup in Figure~\ref{fig:line-by-line}.  The idea is to
% juxtapose a scanned piece of handwritten text with its typeset version
% (or, similarly, to typeset a piece of text in one language alongside a
% line-by-line translation into another language).  The challenge is in
% ensuring that (1)~the same words appear on corresponding lines of text
% and that (2)~the typeset text is fully justified.  While the
% \pkgname{parallel} package can typeset fully justified paragraphs
% aligned in parallel columns, it does not support the alignment of
% individual lines.  |tabular| and |minipage| environments provide
% control of line breaks but do not support full justification of the
% text when explicit line breaks are used.
%
% \begin{figure}[htbp]
% \centering
% \DeleteShortVerb{\|}
% \newsavebox{\tstretchbox}
% \newcolumntype{S}[1]{^^A
%   >{\begin{lrbox}{\tstretchbox}}^^A
%   l^^A
%   <{\end{lrbox}^^A
%   \eqmakebox[#1][s]{\unhcopy\tstretchbox}}}
% \begin{tabular}{|l|l|}
%   \hline
%   \calligra
%   \begin{tabular}{S{handwritten}}
%     Lorem ipsum dolor sit amet,      \\
%     consectetur adipiscing elit.     \\
%     Phasellus volutpat, nibh sit     \\
%     amet mattis convallis, metus     \\
%     libero rhoncus justo, sed auctor \\
%     erat mauris sit amet tellus.     \\
%   \end{tabular}
%   &
%   \begin{tabular}{S{typeset}}
%     Lorem ipsum dolor sit amet,      \\
%     consectetur adipiscing elit.     \\
%     Phasellus volutpat, nibh sit     \\
%     amet mattis convallis, metus     \\
%     libero rhoncus justo, sed auctor \\
%     erat mauris sit amet tellus.     \\
%   \end{tabular} \\
%   \hline
% \end{tabular}
% \MakeShortVerb{\|}
% \caption{Line-by-line transcription of text with full justification}
% \label{fig:line-by-line}
% \end{figure}
%
% One solution is to use \pkgname{eqparbox}'s |\eqmakebox| macro.  Like
% |\makebox|, |\eqmakebox| supports the ``|s|'' (stretch) value for the
% \meta{pos} argument, which causes the \meta{text} argument to stretch
% to the width of the box.  However, while |\makebox| requires the width
% to be specified explicitly, |\eqmakebox| automatically sizes all boxes
% that use the same tag (in this case, each line of the input paragraph)
% to the widest text's natural width.  Here's how to use the
% \pkgname{array} package's |\newcolumntype| macro to define a new
% |tabular| column type, ``|S|'', that stretches whitespace as needed to
% fit the widest line in the column:
%
% \begin{verbatim}
%     \newsavebox{\tstretchbox}
%     \newcolumntype{S}[1]{%
%       >{\begin{lrbox}{\tstretchbox}}%
%       l%
%       <{\end{lrbox}%
%       \eqmakebox[#1][s]{\unhcopy\tstretchbox}}}
% \end{verbatim}
%
% \noindent
% That code works by storing the current cell's contents within a box
% called |\tstretchbox| then passing |\tstretchbox|'s contents to
% |\eqmakebox|.  (The |tabular| environment does not enable a cell's
% contents to be passed directly to a macro, hence the |lrbox|
% trickery.)  Note that the ``|S|'' column type takes an argument, which
% is the tag to pass to |\eqmakebox|.  Using the preceding definition we
% can typeset Figure~\ref{fig:line-by-line} as follows.  To simulate
% scanned handwriting in the left column we use the Calligra handwriting
% font provided by the \pkgname{calligra} package.
%
% \begin{verbatim}
%     \begin{tabular}{|l|l|}
%       \hline
%       \calligra
%       \begin{tabular}{S{handwritten}}
%         Lorem ipsum dolor sit amet,      \\
%         consectetur adipiscing elit.     \\
%         Phasellus volutpat, nibh sit     \\
%         amet mattis convallis, metus     \\
%         libero rhoncus justo, sed auctor \\
%         erat mauris sit amet tellus.     \\
%       \end{tabular}
%       &
%       \begin{tabular}{S{typeset}}
%         Lorem ipsum dolor sit amet,      \\
%         consectetur adipiscing elit.     \\
%         Phasellus volutpat, nibh sit     \\
%         amet mattis convallis, metus     \\
%         libero rhoncus justo, sed auctor \\
%         erat mauris sit amet tellus.     \\
%       \end{tabular} \\
%       \hline
%     \end{tabular}
% \end{verbatim}
%
% \subsection{Combining \texttt{l} and \texttt{p} column properties in a \texttt{tabular}}
% \label{sec:tabular-l-p}
%
% In a |tabular| environment, |l|~columns, which automatically fit the
% column to its contents, are good for short pieces of text.  Long
% pieces of text are best set within a |p|~column, which wraps text
% within a specified width.  But which column type should you use to
% typeset text whose width is unknown (e.g.,~if the text is generated
% programmatically)?  With the help of \pkgname{eqparbox}'s
% |\eqsetmaxwidth| macro (and the \pkgname{array} package's
% |\newcolumntype| macro), it is possible to define a column type that
% behaves like~|l| for short pieces of text and like~|p| for long pieces
% of text:
%
% \begin{verbatim}
%     \newcolumntype{M}[1]{%
%       >{\begin{lrbox}{\csname#1box\endcsname}}%
%       l%
%       <{\end{lrbox}%
%         \eqparbox[t]{#1}{\unhcopy\csname#1box\endcsname\strut}}%
%     }
% \end{verbatim}
%
% This can then be used as follows to produce the output shown in
% Figure~\subref*{fig:maxwd-narrow}:
%
% \begin{verbatim}
%     \eqsetmaxwidth{maybebig}{0.5\linewidth}
%     \newsavebox{\maybebigbox}
%     \begin{tabular}{|M{maybebig}|l|}
%       \hline
%       Very short & Good \\
%       A little bit longer & Okay \\
%     \end{tabular}
% \end{verbatim}
%
% \noindent
% Because the text in the first column is narrower than half the line
% width, the column behaves like an |l|~column.  Now observe what
% happens if we add a long piece of text to the column:
%
% \begin{verbatim}
%     \eqsetmaxwidth{maybebig}{0.5\linewidth}
%     \newsavebox{\maybebigbox}
%     \begin{tabular}{|M{maybebig}|l|}
%       \hline
%       Very short & Good \\
%       A little bit longer & Okay \\
%       Almost certainly excessively long, even given the point we're
%       trying to make about box widths & Bad \\
%     \end{tabular}
% \end{verbatim}
%
% \noindent
% As Figure~\subref*{fig:maxwd-wide} shows, the first column now behaves
% like a |p|~column, specifically |p{0.5\linewidth}|.
%
% \begin{figure}[htbp]
%   \centering
%   \subfloat[Output when the text is narrow\label{fig:maxwd-narrow}]{%
%     \begin{tabular}{|l|l|}
%       \hline
%       Very short & Good \\
%       A little bit longer & Okay \\
%       \hline
%     \end{tabular}%
%   }
%   \par
%   \subfloat[Output when the text is wide\label{fig:maxwd-wide}]{%
%     \begin{tabular}{|p{0.5\linewidth}|l|}
%       \hline
%       Very short & Good \\
%       A little bit longer & Okay \\
%       Almost certainly excessively long, even given the point we're
%       trying to make about box widths & Bad \\
%       \hline
%     \end{tabular}%
%   }
%   \caption{Combining the features of \texttt{l} and \texttt{p} columns}
%   \label{fig:maxwd}
% \end{figure}
%
% \subsection{Centering a column of right-justified data}
% \label{tbl:center-justified}
%
% The data in each of the Sales columns in Table~\ref{tbl:sales-data}
% are centered relative to their column header.  However, they are also
% right-justified relative to each other.  To achieve this effect we
% simply need to put the data in each column in a right-justified box
% using |\eqmakebox|\oarg{tag}|[r]|\marg{text} and center that:
%
% \begin{verbatim}
%     \begin{tabular}{@{}lccc@{}} \hline
%       & \multicolumn{3}{c}{Sales (in millions)} \\ \cline{2-4}
%       \multicolumn{1}{c}{\raisebox{1ex}[2ex]{Product}} &
%       October & November & December \\ \hline
%
%       Widgets      & \eqmakebox[oct][r]{           55.2} &
%                      \eqmakebox[nov][r]{\bfseries  89.2} &
%                      \eqmakebox[dec][r]{           57.9} \\
%       Doohickeys   & \eqmakebox[oct][r]{\bfseries  65.0} &
%                      \eqmakebox[nov][r]{\tiny       N/A} &
%                      \eqmakebox[dec][r]{            9.3} \\
%       Thingamabobs & \eqmakebox[oct][r]{           10.4} &
%                      \eqmakebox[nov][r]{            8.0} &
%                      \eqmakebox[dec][r]{\bfseries 109.7} \\ \hline
%     \end{tabular}
% \end{verbatim}
%
% \begin{table}[htbp]
% \centering
% \caption{Sample sales data}
% \label{tbl:sales-data}
% \begin{tabular}{@{}lccc@{}} \hline
%   & \multicolumn{3}{c}{Sales (in millions)} \\ \cline{2-4}
%   \multicolumn{1}{c}{\raisebox{1ex}[2ex]{Product}} &
%   October & November & December \\ \hline
%
%   Widgets      & \eqmakebox[oct][r]{           55.2} &
%                  \eqmakebox[nov][r]{\bfseries  89.2} &
%                  \eqmakebox[dec][r]{           57.9} \\
%   Doohickeys   & \eqmakebox[oct][r]{\bfseries  65.0} &
%                  \eqmakebox[nov][r]{\tiny       N/A} &
%                  \eqmakebox[dec][r]{            9.3} \\
%   Thingamabobs & \eqmakebox[oct][r]{           10.4} &
%                  \eqmakebox[nov][r]{            8.0} &
%                  \eqmakebox[dec][r]{\bfseries 109.7} \\ \hline
% \end{tabular}
% \end{table}
%
%
% \section{Limitations}
% \label{sec:limitations}
%
% Unfortunately, \pkgname{eqparbox}'s macros have a number of
% limitations not exhibited by the corresponding \LaTeXe\ commands.
% First, \pkgname{eqparbox}'s macros internally typeset the given text
% within a |tabular| environment---specifically, using ``|@{}l@{}|'' as
% the template---in order to determine the text's natural width.
% Consequently, commands not valid within such a |tabular|
% (e.g.,~|verbatim| environments) are also not valid within the
% \meta{text} argument of an \pkgname{eqparbox} macro.  As a corollary,
% the macros defined by the \pkgname{eqparbox} package can appear only
% where a |tabular| is also acceptable.
%
% A second limitation is that \pkgname{eqparbox}'s macros typeset their
% \meta{text} argument \emph{twice}: once within a |tabular| to
% determine the natural width and again within a box wide enough to hold
% all text associated with tag \meta{tag}.  This approach may cause
% unexpected results if \meta{text} is non-idempotent (i.e.,~has side
% effects).  For example, if \meta{text} increments a counter, the
% counter will be incremented twice per invocation of |\eqparbox|.
%
% \StopEventually{}
%
% \section{Implementation}
% \label{sec:implementation}
%
% The one-sentence summary of the implementation is, ``As
% \pkgname{eqparbox} goes along, it keeps track of the maximum width of
% each box type, and when it's finished, it writes those widths to
% the~|.aux| file for use on subsequent runs.''  If you're satisfied
% with that summary, then read no further.  Otherwise, get ready to
% tackle the following annotated code listing.
%
% \subsection{Preliminaries}
%
% \begin{macro}{\eqp@tempdima}
% \begin{macro}{\eqp@tempdimb}
% Define a couple temporary \meta{dimen}s for use in a variety of locations.
%    \begin{macrocode}
\newlength{\eqp@tempdima}
\newlength{\eqp@tempdimb}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\eqp@taglist}
% Define a list of all of the tags we encountered in the author's document.
%    \begin{macrocode}
\def\eqp@taglist{}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ifeqp@must@rerun}
% \begin{macro}{\eqp@must@reruntrue}
% \begin{macro}{\eqp@must@rerunfalse}
% If an |eqparbox| is wider than the maximum-width |eqparbox| with the
% same tag, we need to store the new maximum width and request that the
% user re-run |latex|.  We use |\ifeqp@must@rerun| and |\eqp@must@reruntrue|
% to assist with this.
%    \begin{macrocode}
\newif\ifeqp@must@rerun
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% The |\eqp@settowidth| macro requires the \pkgname{array} package's
% ability to inject code into every cell.
%    \begin{macrocode}
\RequirePackage{array}
%    \end{macrocode}
%
% \begin{macro}{\eqp@tabular@box}
% \begin{macro}{\eqp@list@box}
% The |\eqp@settowidth| macro requires a box, |\eqp@tabular@box|, in
% which to store the entire input text.  |\eqp@settowidth| also requires
% a box, |\eqp@list@box|, in which to store nested |list| environments.
%    \begin{macrocode}
\newsavebox{\eqp@tabular@box}
\newsavebox{\eqp@list@box}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\eqp@list@indent}
% The |\eqp@settowidth| macro stores the accumulated |list| indentation
% in |\eqp@list@indent|.
%    \begin{macrocode}
\newlength{\eqp@list@indent}
%    \end{macrocode}
% \end{macro}
%
% The |eqminipage| environment requires the \pkgname{environ} package's
% |\Collect@Body|, which passes the body of an environment to a macro as
% a single argument.
%    \begin{macrocode}
\RequirePackage{environ}
%    \end{macrocode}
%
%
% \subsection{Width calculation}
%
% \begin{macro}{\eqp@storefont}
% \begin{macro}{\eqp@restorefont}
% To find the natural width of a piece of text, we put it in a table and
% take the width of that.  The problem is that font changes are not
% preserved across line breaks (table cells).  We therefore define an
% |\eqp@storefont| macro which itself defines an |\eqp@restorefont|
% macro that restores the current font and font size to its current
% state.
%    \begin{macrocode}
\newcommand*{\eqp@storefont}{%
  \xdef\eqp@restorefont{%
    \noexpand\usefont{\f@encoding}{\f@family}{\f@series}{\f@shape}%
    \noexpand\fontsize{\f@size}{\f@baselineskip}%
    \noexpand\selectfont
  }%
}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\eqp@settowidth}
% This macro is just like |\settowidth|, but it puts its argument in a
% |tabular|, which means that it can contain |\\|.  We use the
% \pkgname{array} package's ``|>|'' and ``|<|'' template parameters to
% inject an |\eqp@restorefont| at the start of every cell and an
% |\eqp@storefont| at the end of every cell.  Doing so preserves fonts
% and font sizes across |\\| boundaries, just like |\parbox|.
%
% One catch is that lists cannot be included directly within a
% |tabular|.  True, they can be placed within a |\parbox| that itself is
% within a |tabular| cell, but the whole point is that we're trying to
% calculate how wide that |\parbox| should be, The trick we use here,
% therefore, is to redefine the |list| environment as a single-column
% |tabular| plus space for |\labelwidth| and |\labelsep|---we ignore all
% other list-formatting parameters---and |\item| as~|\\|.  There will be
% an extra row at the beginning, but all we care about here is computing
% a width, not a height, so that's acceptable.
% \changes{v2.0}{2004/08/01}{Modified to store and restore the font
%   across \texttt{\string\string\string\\}~boundaries (suggested by
%   Mike Shell)}
% \changes{v4.0}{2013/03/09}{Added support for list environments}
% \changes{v4.0}{2013/03/15}{Added support for multi-paragraph input}
%    \begin{macrocode}
\newcommand{\eqp@settowidth}[2]{%
  \begingroup
    \global\setbox\eqp@tabular@box=\hbox{%
%    \end{macrocode}
% \begin{macro}{\eqp@endings}
% Unfortunately, we can't simply redefine the |list| environment, which
% underlies |itemize|, |enumerate|, and |description| lists, because
% their definitions in the standard classes do not include a proper
% |\begin{list}|\dots\linebreak[0]|\end{list}|.  Instead, those parent
% environments call |\list| directly and
% |\let\end|\{|itemize|,\linebreak[0]|enumerate|,\linebreak[0]|description|\}|=\endlist|.
% Our workaround is to reissue those |\let| bindings after redefining
% |\list| and |\endlist| ourselves.
%    \begin{macrocode}
      \def\eqp@endings{}%
      \ifx\enditemize\endlist
        \g@addto@macro\eqp@endings{\let\enditemize=\endlist}%
      \fi
      \ifx\endenumerate\endlist
        \g@addto@macro\eqp@endings{\let\endenumerate=\endlist}%
      \fi
      \ifx\enddescription\endlist
        \g@addto@macro\eqp@endings{\let\enddescription=\endlist}%
      \fi
%    \end{macrocode}
% \begin{environment}{list}
% As described above, we locally redefine the |list| environment as a
% single-column |tabular| and the |\item| macro as~|\\|.  We begin by
% copying a block of code from |ltlists.dtx| that sets the default
% formatting parameters for a list of the current depth.  This is
% important because |trivlist| environments (e.g.,~|center| and
% |flushleft|) reset some of the parameters, which would otherwise screw
% up our width calculation.
%    \begin{macrocode}
      \renewenvironment{list}[2]{%
        \ifnum \@listdepth >5\relax
          \@toodeep
        \else
          \global\advance\@listdepth\@ne
        \fi
        \rightmargin\z@
        \listparindent\z@
        \itemindent\z@
        \csname @list\romannumeral\the\@listdepth\endcsname
        ##2\relax
%    \end{macrocode}
% \begin{macro}{\item}
% We locally redefine |\item| to start a new row of the |tabular|, then
% flush any nested lists from the previous |\item| at the current
% nesting level, and finally adjust the current indentation based on
% the item's label.
%    \begin{macrocode}
        \renewcommand*{\item}[1][]{%
          \mbox{}\\
          \box\eqp@list@box\mbox{} \\
          \sbox\@tempboxa{\makelabel{####1}}%
          \ifdim\wd\@tempboxa>\labelwidth
            \advance\eqp@list@indent by -\labelwidth
            \advance\eqp@list@indent by \wd\@tempboxa
          \fi
          \hspace*{\eqp@list@indent}%
        }%
%    \end{macrocode}
% To measure the width of a |list| we introduce a single-column
% |tabular| that includes |\eqp@list@indent|'s worth of padding ($\sum$
% |\leftmargin|~$+$ |\rightmargin|~$+$ |\itemindent|) to mimic the width
% of the original |list| environment.
%    \begin{macrocode}
        \hspace*{-\eqp@list@indent}%
        \advance\eqp@list@indent by \leftmargin
        \advance\eqp@list@indent by \rightmargin
        \advance\eqp@list@indent by \itemindent
        \global\setbox\eqp@list@box=\hbox\bgroup
        \begin{tabular}{@{}l@{}}%
      }{%
        \item[]%
        \end{tabular}%
        \egroup
        \global\advance\@listdepth\m@ne
      }%
      \eqp@endings
%    \end{macrocode}
% Finally, we place the given text---list or not---within a |tabular| so
% the preceding |\settowidth| can measure its width.  Because the text
% may contain paragraph breaks we redefine |\par| as~|\\| to turn them
% into line breaks and restore |\par|'s original definition when the
% |tabular| ends.
%    \begin{macrocode}
      \global\let\eqp@par=\par
      \eqp@storefont
      \begin{tabular}{@{}>{\eqp@restorefont}l<{\eqp@storefont}@{}}%
        \global\@setpar{\\}%
        #2%
        \\ \box\eqp@list@box
      \end{tabular}%
      \global\@restorepar
    }%
  \endgroup
%    \end{macrocode}
% Now that we've constructed a |tabular| with lines of the input text as
% cells we can use \LaTeX's |\settowidth| macro to take its width.
%    \begin{macrocode}
  \settowidth{#1}{\box\eqp@tabular@box}%
}
%    \end{macrocode}
% \end{macro}
% \end{environment}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\eqp@compute@width}
% The following function does all the real work for the
% \pkgname{eqparbox} package.  It takes two parameters---\meta{tag} and
% \meta{text}---and ensures that all boxes with the same tag will be as
% wide as the widest box with that tag.  It ends by passing \meta{tag}
% and \meta{text} to the |\eqp@produce@box| command, which was defined
% by the calling macro to produce a box using one of the existing
% \LaTeXe\ commands.
%
% To keep track of box widths, |\eqp@compute@width| makes use of two global
% variables for each tag: |\eqp@this@|\meta{tag} and
% |\eqp@next|\meta{tag}.  |\eqp@this@|\meta{tag} is the maximum width
% ever seen for tag \meta{tag}, including in previous |latex| runs.
% |\eqp@next@|\meta{tag} works the same way but is always initialized
% to~|0.0pt|.  It represents the maximum width to assume in
% \emph{subsequent} |latex| runs.  It is needed to detect whether the
% dest text with tag \meta{tag} has been removed/shrunk.  At the end of
% a run, \pkgname{eqparbox} prepares the next run (via the~|.aux| file)
% to initialize |\eqp@this@|\meta{tag} to the final value of
% |\eqp@next@|\meta{tag}.
% \changes{v2.0}{2004/07/30}{Removed extraneous \texttt{\string\string\string\global}s
%   (suggested by David Kastrup)}
% \changes{v3.1}{2010/01/01}{Restructured the package to make all
%   user-callable functions eventually call
%   \texttt{\string\string\string\eqp@compute@width}, which does the
%   bulk of the work}
%    \begin{macrocode}
\long\def\eqp@compute@width#1#2{%
  \eqp@settowidth{\eqp@tempdimb}{#2}%
%    \end{macrocode}
% We first clamp the box width, currently in |\eqp@tempdimb|, to the
% range [|\eqp@minwd@|\meta{tag}, |\eqp@maxwd@|\meta{tag}].  As these
% bounds are not necessarily defined we first have to check for their
% existence.
%    \begin{macrocode}
  \@ifundefined{eqp@minwd@#1}{}{%
    \ifdim\eqp@tempdimb<\csname eqp@minwd@#1\endcsname
      \eqp@tempdimb=\csname eqp@minwd@#1\endcsname
    \fi
  }%
  \@ifundefined{eqp@maxwd@#1}{}{%
    \ifdim\eqp@tempdimb>\csname eqp@maxwd@#1\endcsname
      \eqp@tempdimb=\csname eqp@maxwd@#1\endcsname
    \fi
  }%
  \expandafter
  \ifx\csname eqp@this@#1\endcsname\relax
%    \end{macrocode}
% If we get here, then we've never encountered tag \meta{tag}, even in a
% previous |latex| run.  We request that the user re-run |latex| This is
% not always necessary (e.g.,~when all uses of the |\eqparbox| with tag
% \meta{tag} are left-justified), but it's better to be safe than sorry.
%    \begin{macrocode}
    \global\eqp@must@reruntrue
    \expandafter\xdef\csname eqp@this@#1\endcsname{\the\eqp@tempdimb}%
    \expandafter\xdef\csname eqp@next@#1\endcsname{\the\eqp@tempdimb}%
  \else
%    \end{macrocode}
% If we get here, then we \emph{have} previously seen tag \meta{tag}.
% We just have to keep track of the maximum text width associated with
% it.
%    \begin{macrocode}
    \eqp@tempdima=\csname eqp@this@#1\endcsname\relax
    \ifdim\eqp@tempdima<\eqp@tempdimb
      \expandafter\xdef\csname eqp@this@#1\endcsname{\the\eqp@tempdimb}%
      \global\eqp@must@reruntrue
    \fi
%    \end{macrocode}
%    \begin{macrocode}
    \eqp@tempdima=\csname eqp@next@#1\endcsname\relax
    \ifdim\eqp@tempdima<\eqp@tempdimb
      \expandafter\xdef\csname eqp@next@#1\endcsname{\the\eqp@tempdimb}%
    \fi
  \fi
%    \end{macrocode}
%
% The first time we encounter tag \meta{tag} in the current document we
% ensure \LaTeX{} will notify the user if he needs to re-run |latex| on
% account of that tag.
%    \begin{macrocode}
  \@ifundefined{eqp@seen@#1}{%
    \expandafter\gdef\csname eqp@seen@#1\endcsname{}%
    \@cons\eqp@taglist{{#1}}%
  }{}%
%    \end{macrocode}
%
% Finally, we can call |\eqp@produce@box|.  We pass it
% |\eqp@this@|\meta{tag} for its \meta{width} argument and |#2| for its
% \meta{text} argument.
%    \begin{macrocode}
  \eqp@tempdima=\csname eqp@this@#1\endcsname\relax
  \eqp@produce@box{\eqp@tempdima}{#2}%
}
%    \end{macrocode}
% \end{macro}
%
% \subsection{Author macros}
%
% \begin{macro}{\eqparbox}
% We want |\eqparbox| to take the same arguments as |\parbox|, with the
% same default values for the optional arguments.  The only difference
% in argument processing is that |\eqparbox| has a \meta{tag} argument
% where |\parbox| has \meta{width}.
%
% Because |\eqparbox| has more than one optional argument, we can't use
% a single function defined by |\DeclareRobustCommand|.  Instead, we
% have to split |\eqparbox| into |\eqparbox|, |\eqparbox@i|,
% |\eqparbox@ii|, and |\eqparbox@iii| macros, which correspond to
% |\parbox|, |\@iparbox|, |\@iiparbox|, and |\@iiiparbox| in
% |ltboxes.dtx|.
%
% |\eqparbox| takes an optional \meta{pos} argument that defaults
% to~|c|.  It passes the value of this argument to |\eqparbox@i|.
%    \begin{macrocode}
\DeclareRobustCommand{\eqparbox}{%
  \@ifnextchar[%]
    {\eqparbox@i}%
    {\eqparbox@iii[c][\relax][s]}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\eqparbox@i}
% |\eqparbox@i| takes a \meta{pos} argument followed by an optional
% \meta{height} argument that defaults to~|\relax|.  It passes both
% \meta{pos} and \meta{height} to |\eqparbox@ii|.
%    \begin{macrocode}
\def\eqparbox@i[#1]{%
  \@ifnextchar[%]
    {\eqparbox@ii[#1]}%
    {\eqparbox@iii[#1][\relax][s]}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\eqparbox@ii}
% |\eqparbox@ii| takes \meta{pos} and \meta{height} arguments followed
% by an optional \meta{inner-pos} argument that defaults to \meta{pos}.
% It passes \meta{pos}, \meta{height}, and \meta{inner-pos} to
% |\eqparbox@iii|.
%    \begin{macrocode}
\def\eqparbox@ii[#1][#2]{%
  \@ifnextchar[%]
    {\eqparbox@iii[#1][#2]}%
    {\eqparbox@iii[#1][#2][#1]}%
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\eqparbox@iii}
% \begin{macro}{\eqp@produce@box}
% |\eqparbox@iii| takes \meta{pos}, \meta{height} and \meta{inner-pos}
% arguments.  It defines an |\eqp@produce@box| macro that takes a
% \meta{width} argument and a \meta{text} argument and passes all of
% \meta{pos}, \meta{height}, \meta{inner-pos}, \meta{width}, and
% \meta{text} to \LaTeX's |\parbox| macro.  |\eqparbox@iii| ends by
% calling |\eqp@compute@width|, which will eventually invoke
% |\eqp@produce@box|.
%    \begin{macrocode}
\def\eqparbox@iii[#1][#2][#3]{%
  \long\gdef\eqp@produce@box##1##2{%
    \parbox[#1][#2][#3]{##1}{##2}%
  }%
  \eqp@compute@width
}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{environment}{eqminipage}
% The |eqminipage| environment is implemented almost exactly like the
% |\eqparbox| macro above.  Just like |\eqparbox|, |eqminipage| takes an
% optional \meta{pos} argument that defaults to~|c|.  It passes the
% value of this argument to |\eqminipage@i|.
% \changes{v4.0}{2013/03/14}{Introduced this environment}
%    \begin{macrocode}
\DeclareRobustCommand{\eqminipage}{%
  \@ifnextchar[%]
    {\eqminipage@i}%
    {\eqminipage@iii[c][\relax][s]}%
}
\let\endeqpminipage=\relax
%    \end{macrocode}
% \end{environment}
%
% \begin{macro}{\eqminipage@i}
% |\eqminipage@i| takes a \meta{pos} argument followed by an optional
% \meta{height} argument that defaults to~|\relax|.  It passes both
% \meta{pos} and \meta{height} to |\eqminipage@ii|.
%    \begin{macrocode}
\long\def\eqminipage@i[#1]{%
  \@ifnextchar[%]
    {\eqminipage@ii[#1]}%
    {\eqminipage@iii[#1][\relax][s]}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\eqminipage@ii}
% |\eqminipage@ii| takes \meta{pos} and \meta{height} arguments followed
% by an optional \meta{inner-pos} argument that defaults to \meta{pos}.
% It passes \meta{pos}, \meta{height}, and \meta{inner-pos} to
% |\eqminipage@iii|.
%    \begin{macrocode}
\def\eqminipage@ii[#1][#2]{%
  \@ifnextchar[%]
    {\eqminipage@iii[#1][#2]}%
    {\eqminipage@iii[#1][#2][#1]}%
}
%    \end{macrocode}
% \end{macro}
% \begin{macro}{\eqminipage@iii}
% This is where |eqminipage| differs from |\eqparbox|.  Like
% |\eqparbox@iii|, |\eqminipage@iii| takes \meta{pos}, \meta{height} and
% \meta{inner-pos} arguments.  However, while |\eqparbox@iii| expects to
% be followed by a tag and text, |\eqminipage@iii| consumes the tag
% itself.  |\eqminipage@iii| then uses \pkgname{environ}'s
% |\Collect@Body| macro to collect everything up to the
% |\end{eqminipage}| into a single argument, which it passes to
% |\eqminipage@iv|.
%    \begin{macrocode}
\def\eqminipage@iii[#1][#2][#3]#4{%
%    \end{macrocode}
% \begin{macro}{\eqminipage@iv}
% \begin{macro}{\eqp@produce@box}
% This code is a bit confusing due to the definition of a macro within a
% macro within a macro.  |\eqminipage@iv|, which is invoked by
% |\collect@body|, is passed the body of the |eqminipage| environment as
% an argument.  In then defines an |\eqp@produce@box| macro with the
% parameter list that |\eqp@compute@width| expects: a width (|####1|)
% and text (|####2|).  |\eqp@produce@box| typesets a |minipage| with
% that width and text and the formatting parameters provided to
% |\eqminipage@iii| (|#1|, |#2|, and~|#3|).  Finally, |\eqminipage@iv|
% invokes |\eqp@compute@width| with the tag passed to |\eqminipage@iii|
% as~|#4| and the text passed to |\eqminipage@iv| as~|##1|.
%    \begin{macrocode}
  \long\def\eqminipage@iv##1{%
    \long\gdef\eqp@produce@box####1####2{%
      \begin{minipage}[#1][#2][#3]{####1}%
        ####2%
      \end{minipage}%
    }%
    \eqp@compute@width{#4}{##1}%
  }%
  \Collect@Body\eqminipage@iv
}
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\eqmakebox}
% |\eqmakebox| provides an automatic-width analogue to \LaTeX's
% |\makebox|.  It takes the same arguments as |\makebox| with the same
% default values for the optional arguments.  The only difference in
% argument processing is that |\eqmakebox| has a \meta{tag} argument
% where |\makebox| has \meta{width}.  Note that if \meta{width} is not
% specified, |\eqmakebox| simply invokes |\makebox|.
% \changes{v3.0}{2010/01/01}{Included Rob Verhoeven's
%   \texttt{\string\string\string\eqmakebox} macro}
% \changes{v3.1}{2010/01/01}{Modified the argument processing to match
%   \texttt{\string\string\string\makebox}'s}
%    \begin{macrocode}
\DeclareRobustCommand{\eqmakebox}{%
  \@ifnextchar[%]
    {\eqlrbox@i\makebox}%
    {\makebox}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\eqframebox}
% |\eqframebox| provides an automatic-width analogue to \LaTeX's
% |\framebox|.  It takes the same arguments as |\framebox| with the same
% default values for the optional arguments.  The only difference in
% argument processing is that |\eqframebox| has a \meta{tag} argument
% where |\framebox| has \meta{width}.  Note that if \meta{width} is not
% specified, |\eqframebox| simply invokes |\framebox|.
% \changes{v3.1}{2010/01/01}{Introduced this macro}
%    \begin{macrocode}
\DeclareRobustCommand{\eqframebox}{%
  \@ifnextchar[%]
    {\eqlrbox@i\framebox}%
    {\framebox}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\eqsavebox}
% |\eqsavebox| provides an automatic-width analogue to \LaTeX's
% |\savebox|.  It takes the same arguments as |\savebox| with the same
% default values for the optional arguments.  The only difference in
% argument processing is that |\eqsavebox| has a \meta{tag} argument
% where |\savebox| has \meta{width}.  Note that if \meta{width} is not
% specified, |\eqsavebox| simply invokes |\savebox|.
% \changes{v3.1}{2010/01/01}{Introduced this macro}
%    \begin{macrocode}
\DeclareRobustCommand{\eqsavebox}[1]{%
  \@ifnextchar[%]
    {\eqlrbox@i{\savebox{#1}}}%
    {\savebox{#1}}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\eqlrbox@i}
% |\eqlrbox@i| takes a \marg{command} argument (one of |\makebox|,
% |\framebox|, or |\savebox|\marg{cmd}) and a \oarg{tag} argument and
% checks if those arguments are followed by a \oarg{pos} argument.  If
% not, then \meta{pos} defaults to ``|c|''.  All of \meta{command},
% \meta{tag}, and \meta{pos} are passed to |\eqlrbox@ii|.
%    \begin{macrocode}
\def\eqlrbox@i#1[#2]{%
  \@ifnextchar[%]
    {\eqlrbox@ii{#1}[#2]}%
    {\eqlrbox@ii{#1}[#2][c]}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\eqlrbox@ii}
% \begin{macro}{\eqp@produce@box}
% |\eqlrbox@i| takes a \marg{command} argument (one of |\makebox|,
% |\framebox|, or |\savebox|\marg{cmd}), a \oarg{tag} argument, and a
% \oarg{pos} argument.  It defines |\eqp@produce@box| to take a
% \meta{width} argument and a \meta{text} argument and invoke
% \meta{command}\oarg{width}\oarg{pos}\marg{text}.  |\eqlrbox@ii| ends
% by calling |\eqp@compute@width|, which will eventually invoke
% |\eqp@produce@box|.
%    \begin{macrocode}
\def\eqlrbox@ii#1[#2][#3]{%
  \long\gdef\eqp@produce@box##1##2{%
    #1[##1][#3]{##2}%
  }%
  \eqp@compute@width{#2}%
}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\eqboxwidth}
% For the times that the user wants to make something other than a box to
% match an |\eqparbox|'s width, we provide |\eqboxwidth|.  |\eqboxwidth|
% returns the width of a box corresponding to a given tag.  More
% precisely, if |\eqp@this@|\meta{tag} is defined, it's returned.
% Otherwise,~|0pt| is returned.
% \changes{v2.1}{2004/08/02}{Rewrote so as to be compatible with the
%   \pkgname{calc} package's \texttt{\string\string\string\setlength}
%   command (problem initially reported by Gary L. Gray and narrowed
%   down by Martin Vaeth)}
%    \begin{macrocode}
\newcommand*{\eqboxwidth}[1]{%
  \@ifundefined{eqp@this@#1}{0pt}{\csname eqp@this@#1\endcsname}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\eqsetminwidth}
% The |\eqsetminwidth| macro accepts a tag and a length and records that
% the user wants the associated box to be no narrower than the given
% length.
% \changes{v4.0}{2013/03/04}{Introduced this macro}
%    \begin{macrocode}
\newcommand{\eqsetminwidth}[2]{%
  \@tempdima=#2\relax
  \expandafter\xdef\csname eqp@minwd@#1\endcsname{\the\@tempdima}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\eqsetmaxwidth}
% The |\eqsetmaxwidth| macro accepts a tag and a length and records that
% the user wants the associated box to be no wider than the given
% length.
% \changes{v4.0}{2013/03/04}{Introduced this macro}
%    \begin{macrocode}
\newcommand{\eqsetmaxwidth}[2]{%
  \@tempdima=#2\relax
  \expandafter\xdef\csname eqp@maxwd@#1\endcsname{\the\@tempdima}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\eqsetminwidthto}
% The |\eqsetminwidthto| macro accepts a tag and a piece of text and
% records that the user wants the associated box to be no narrower than
% the text, typeset at its natural width.
% \changes{v4.0}{2013/03/04}{Introduced this macro}
%    \begin{macrocode}
\newcommand{\eqsetminwidthto}[2]{%
  \eqp@settowidth{\@tempdima}{#2}%
  \expandafter\xdef\csname eqp@minwd@#1\endcsname{\the\@tempdima}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\eqsetmaxwidthto}
% The |\eqsetmaxwidthto| macro accepts a tag and a piece of text and
% records that the user wants the associated box to be no wider than
% the text, typeset at its natural width.
% \changes{v4.0}{2013/03/04}{Introduced this macro}
%    \begin{macrocode}
\newcommand{\eqsetmaxwidthto}[2]{%
  \eqp@settowidth{\@tempdima}{#2}%
  \expandafter\xdef\csname eqp@maxwd@#1\endcsname{\the\@tempdima}%
}
%    \end{macrocode}
% \end{macro}
%
% \subsection{End-of-document processing}
%
% At the |\end{document}|, for each tag \meta{tag} we see if
% |\eqp@next@|\meta{tag}, which was initialized to~|0.0pt|, is different
% from |\eqp@this@|\meta{tag}, which was initialized to the maximum box
% width from the previous run.  If so, we issue an informational
% message.  In any case, we initialize the next run's
% |\eqp@this@|\meta{tag} to |\eqp@next@|\meta{tag} and the next run's
% |\eqp@next@|\meta{tag} to |0pt|.
%    \begin{macrocode}
\AtEndDocument{%
  \begingroup
%    \end{macrocode}
% \begin{macro}{\@elt}
% The |\eqp@taglist| list is of the form ``|\@elt| |{|\meta{tag$_1$}|}|
% |\@elt| |{|\meta{tag$_2$}|}|~\ldots''.  We therefore locally define
% |\@elt| to take the name of a tag and perform all of the checking
% described above and then merely execute |\eqp@taglist|.
% \changes{v2.0}{2004/08/01}{Modified to allow numbers in tag names
%   (suggested by Martin Vaeth)}
% \changes{v4.0}{2013/03/04}{Modified to honor minimum and maximum
%   text widths, as set by
%   \texttt{\string\string\string\eqset}\{\texttt{max},\texttt{min}\}\texttt{width} and
%   \texttt{\string\string\string\eqset}\{\texttt{max},\texttt{min}\}\texttt{widthto}}
%    \begin{macrocode}
    \def\@elt#1{%
%    \end{macrocode}
% Complain if the tag's minimum width is greater than its maximum width.
%    \begin{macrocode}
      \@ifundefined{eqp@minwd@#1}{}{%
        \@ifundefined{eqp@maxwd@#1}{}{%
          \ifdim\csname eqp@minwd@#1\endcsname>\csname eqp@maxwd@#1\endcsname
            \PackageWarning{eqparbox}{For tag `#1',
              minimum width (\csname eqp@minwd@#1\endcsname) >
              maximum width (\csname eqp@maxwd@#1\endcsname)}%
          \fi
        }%
      }%
%    \end{macrocode}
% Make the |.aux| file define |\eqp@this@|\meta{tag} to the current
% value of |\eqp@next@|\meta{tag} and |\eqp@next@|\meta{tag} to |0pt|.
%    \begin{macrocode}
      \eqp@tempdima\csname eqp@this@#1\endcsname\relax
      \eqp@tempdimb\csname eqp@next@#1\endcsname\relax
      \ifdim\eqp@tempdima=\eqp@tempdimb
      \else
        \@latex@warning@no@line{Rerun to correct the width of eqparbox `#1'}%
      \fi
      \immediate\write\@auxout{%
        \string\expandafter\string\gdef\string\csname\space
        eqp@this@#1\string\endcsname{%
          \csname eqp@next@#1\endcsname
        }%
        ^^J%
        \string\expandafter\string\gdef\string\csname\space
         eqp@next@#1\string\endcsname{0pt}%
      }%
%    \end{macrocode}
% Also make the |.aux| file define |\eqp@minwd@|\meta{tag} and
% |\eqp@maxwd@|\meta{tag} to their current value, if any.
%    \begin{macrocode}
      \@ifundefined{eqp@minwd@#1}{}{%
        \immediate\write\@auxout{%
          \string\expandafter\string\gdef\string\csname\space
          eqp@minwd@#1\string\endcsname{%
            \csname eqp@minwd@#1\endcsname
          }%
        }%
      }%
      \@ifundefined{eqp@maxwd@#1}{}{%
        \immediate\write\@auxout{%
          \string\expandafter\string\gdef\string\csname\space
          eqp@maxwd@#1\string\endcsname{%
            \csname eqp@maxwd@#1\endcsname
          }%
        }%
      }%
    }%
    \eqp@taglist
  \endgroup
%    \end{macrocode}
% We output a generic ``rerun |latex|'' message if we encountered a
% tag that was not present on the previous run.  (This is always the
% case on the first run or the first run after deleting the
% corresponding |.aux| file.
%    \begin{macrocode}
  \ifeqp@must@rerun
    \@latex@warning@no@line{Rerun to correct eqparbox widths}
  \fi
}
%    \end{macrocode}
% \end{macro}
%
% \Finale
\endinput