summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/source/latex/oberdiek/engord.dtx
blob: 6c75953200263d137bb64c105ea3f753e04dcb38 (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
% \iffalse meta-comment
%
% File: engord.dtx
% Version: 2016/05/16 v1.9
% Info: Provides English ordinal numbers
%
% Copyright (C)
%    2000, 2003, 2006-2008, 2010 Heiko Oberdiek
%    2016-2019 Oberdiek Package Support Group
%    https://github.com/ho-tex/oberdiek/issues
%
% This work 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. This version of this license is in
%    https://www.latex-project.org/lppl/lppl-1-3c.txt
% and the latest version of this license is in
%    https://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 Maintainers of this work are
% Heiko Oberdiek and the Oberdiek Package Support Group
% https://github.com/ho-tex/oberdiek/issues
%
% The Base Interpreter refers to any `TeX-Format',
% because some files are installed in TDS:tex/generic//.
%
% This work consists of the main source file engord.dtx
% and the derived files
%    engord.sty, engord.pdf, engord.ins, engord.drv, engord-test1.tex.
%
% Distribution:
%    CTAN:macros/latex/contrib/oberdiek/engord.dtx
%    CTAN:macros/latex/contrib/oberdiek/engord.pdf
%
% Unpacking:
%    (a) If engord.ins is present:
%           tex engord.ins
%    (b) Without engord.ins:
%           tex engord.dtx
%    (c) If you insist on using LaTeX
%           latex \let\install=y\input{engord.dtx}
%        (quote the arguments according to the demands of your shell)
%
% Documentation:
%    (a) If engord.drv is present:
%           latex engord.drv
%    (b) Without engord.drv:
%           latex engord.dtx; ...
%    The class ltxdoc loads the configuration file ltxdoc.cfg
%    if available. Here you can specify further options, e.g.
%    use A4 as paper format:
%       \PassOptionsToClass{a4paper}{article}
%
%    Programm calls to get the documentation (example):
%       pdflatex engord.dtx
%       makeindex -s gind.ist engord.idx
%       pdflatex engord.dtx
%       makeindex -s gind.ist engord.idx
%       pdflatex engord.dtx
%
% Installation:
%    TDS:tex/generic/oberdiek/engord.sty
%    TDS:doc/latex/oberdiek/engord.pdf
%    TDS:source/latex/oberdiek/engord.dtx
%
%<*ignore>
\begingroup
  \catcode123=1 %
  \catcode125=2 %
  \def\x{LaTeX2e}%
\expandafter\endgroup
\ifcase 0\ifx\install y1\fi\expandafter
         \ifx\csname processbatchFile\endcsname\relax\else1\fi
         \ifx\fmtname\x\else 1\fi\relax
\else\csname fi\endcsname
%</ignore>
%<*install>
\input docstrip.tex
\Msg{************************************************************************}
\Msg{* Installation}
\Msg{* Package: engord 2016/05/16 v1.9 Provides English ordinal numbers (HO)}
\Msg{************************************************************************}

\keepsilent
\askforoverwritefalse

\let\MetaPrefix\relax
\preamble

This is a generated file.

Project: engord
Version: 2016/05/16 v1.9

Copyright (C)
   2000, 2003, 2006-2008, 2010 Heiko Oberdiek
   2016-2019 Oberdiek Package Support Group

This work 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. This version of this license is in
   https://www.latex-project.org/lppl/lppl-1-3c.txt
and the latest version of this license is in
   https://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 Maintainers of this work are
Heiko Oberdiek and the Oberdiek Package Support Group
https://github.com/ho-tex/oberdiek/issues


The Base Interpreter refers to any `TeX-Format',
because some files are installed in TDS:tex/generic//.

This work consists of the main source file engord.dtx
and the derived files
   engord.sty, engord.pdf, engord.ins, engord.drv, engord-test1.tex.

\endpreamble
\let\MetaPrefix\DoubleperCent

\generate{%
  \file{engord.ins}{\from{engord.dtx}{install}}%
  \file{engord.drv}{\from{engord.dtx}{driver}}%
  \usedir{tex/generic/oberdiek}%
  \file{engord.sty}{\from{engord.dtx}{package}}%
%  \usedir{doc/latex/oberdiek/test}%
%  \file{engord-test1.tex}{\from{engord.dtx}{test1}}%
}

\catcode32=13\relax% active space
\let =\space%
\Msg{************************************************************************}
\Msg{*}
\Msg{* To finish the installation you have to move the following}
\Msg{* file into a directory searched by TeX:}
\Msg{*}
\Msg{*     engord.sty}
\Msg{*}
\Msg{* To produce the documentation run the file `engord.drv'}
\Msg{* through LaTeX.}
\Msg{*}
\Msg{* Happy TeXing!}
\Msg{*}
\Msg{************************************************************************}

\endbatchfile
%</install>
%<*ignore>
\fi
%</ignore>
%<*driver>
\NeedsTeXFormat{LaTeX2e}
\ProvidesFile{engord.drv}%
  [2016/05/16 v1.9 Provides English ordinal numbers (HO)]%
\documentclass{ltxdoc}
\usepackage{holtxdoc}[2011/11/22]
\begin{document}
  \DocInput{engord.dtx}%
\end{document}
%</driver>
% \fi
%
%
%
% \GetFileInfo{engord.drv}
%
% \title{The \xpackage{engord} package}
% \date{2016/05/16 v1.9}
% \author{Heiko Oberdiek\thanks
% {Please report any issues at \url{https://github.com/ho-tex/oberdiek/issues}}}
%
% \maketitle
%
% \begin{abstract}
% The package generates the suffix of English ordinal numbers.
% It can be used with plain and \LaTeX\ formats.
% \end{abstract}
%
% \tableofcontents
%
% \section{Usage}
%
% \begin{declcs}{engord}\,\M{\LaTeX\ counter name}
% \end{declcs}
% It prints the value of the \LaTeX\ counter as English
% ordinal number. It can be used in the same way as
% \cs{arabic}, \cs{roman}, or \cs{alph}. The command is
% not available in \plainTeX.
%
% \begin{declcs}{engordnumber}\,\M{any \TeX\ number}
% \end{declcs}
% It prints the number as English ordinal number.
%
% \begin{declcs}{engordletters}\,|{#1}|
% \end{declcs}
% This command formats the English ordinal letters
% after the number. It defaults to \cs{textsuperscript}.
%
% \begin{declcs}{engorderror}\,|{#1}|
% \end{declcs}
% It can be redefined, if an other error handling is
% wanted. The argument is a negative number or zero.
%
% \begin{declcs}{engordraisetrue}\\
%   \SpecialUsageIndex{\engordraisefalse}\cs{engordraisefalse}
% \end{declcs}
% These commands set the switch \cs{ifengordraise} that is
% asked by the default \cs{engordletters} before raising the
% ordinal letters.
%
% \subsection{Package options}
%
% \begin{description}
% \item[\xoption{normal}:] \cs{engordraisefalse}
% \item[\xoption{raise}:] \cs{engordraisetrue}
% \end{description}
% Default is \xoption{raise}.
%
% \subsection{Examples}
%
% \begin{itemize}
% \item
%   |\usepackage[normal]{engord}|\\
%   \begin{tabular}{@{}l@{ $\rightarrow$ }l@{}}
%     |\engordnumber{1}|   & 1st\\
%     |\engordnumber{12}|  & 12th\\
%     |\engordnumber{123}| & 123rd\\
%     |\engord{page}|      & 1st (if page has the value of one)\\
%     \multicolumn{2}{@{}l}{\cs{engordraisetrue}}\\
%     |\engordnumber{12}|  & 12\textsuperscript{th}
%   \end{tabular}
% \item
%     The default output of a counter can be redefined:
%     \begin{quote}
%       |\newcounter{mycounter}|\\
%       |\renewcommand{\theengcounter}{\engord{mycounter}}|
%     \end{quote}
% \item
%     Because the implementation of \cs{engord} and \cs{engordnumber}
%     is kept expandable, these commands can be used to make
%     command names with an appropriate definition of
%     \cs{engordletters}:
%     \begin{quote}
%       |\renewcommand*{\engordletters}[1]{#1}|\\
%       |\@namedef{My\engordnumber{3}Command}{...}|
%     \end{quote}
%     This generates the command name `\cs{My4rdCommand}'.
%     Since version 1.2 the redefinition can be dropped if
%     the letters are not raised.
% \item
%     If the letters should not be raised, use \LaTeX\ package
%     option \xoption{normal} or use
%     \begin{quote}
%       \cs{engordraisefalse}
%     \end{quote}
%     Also \cs{engordletters} could be redefined for this purpose:
%     \begin{quote}
%       |\renewcommand*{\engordletters}[1]{#1}|
%     \end{quote}
% \end{itemize}
%
% \StopEventually{
% }
%
% \section{Implementation}
%
% \subsection{Reload check and identification}
%
%    \begin{macrocode}
%<*package>
%    \end{macrocode}
%    Reload check, especially if the package is not used with \LaTeX.
%    \begin{macrocode}
\begingroup\catcode61\catcode48\catcode32=10\relax%
  \catcode13=5 % ^^M
  \endlinechar=13 %
  \catcode35=6 % #
  \catcode39=12 % '
  \catcode44=12 % ,
  \catcode45=12 % -
  \catcode46=12 % .
  \catcode58=12 % :
  \catcode64=11 % @
  \catcode123=1 % {
  \catcode125=2 % }
  \expandafter\let\expandafter\x\csname ver@engord.sty\endcsname
  \ifx\x\relax % plain-TeX, first loading
  \else
    \def\empty{}%
    \ifx\x\empty % LaTeX, first loading,
      % variable is initialized, but \ProvidesPackage not yet seen
    \else
      \expandafter\ifx\csname PackageInfo\endcsname\relax
        \def\x#1#2{%
          \immediate\write-1{Package #1 Info: #2.}%
        }%
      \else
        \def\x#1#2{\PackageInfo{#1}{#2, stopped}}%
      \fi
      \x{engord}{The package is already loaded}%
      \aftergroup\endinput
    \fi
  \fi
\endgroup%
%    \end{macrocode}
%    Package identification:
%    \begin{macrocode}
\begingroup\catcode61\catcode48\catcode32=10\relax%
  \catcode13=5 % ^^M
  \endlinechar=13 %
  \catcode35=6 % #
  \catcode39=12 % '
  \catcode40=12 % (
  \catcode41=12 % )
  \catcode44=12 % ,
  \catcode45=12 % -
  \catcode46=12 % .
  \catcode47=12 % /
  \catcode58=12 % :
  \catcode64=11 % @
  \catcode91=12 % [
  \catcode93=12 % ]
  \catcode123=1 % {
  \catcode125=2 % }
  \expandafter\ifx\csname ProvidesPackage\endcsname\relax
    \def\x#1#2#3[#4]{\endgroup
      \immediate\write-1{Package: #3 #4}%
      \xdef#1{#4}%
    }%
  \else
    \def\x#1#2[#3]{\endgroup
      #2[{#3}]%
      \ifx#1\@undefined
        \xdef#1{#3}%
      \fi
      \ifx#1\relax
        \xdef#1{#3}%
      \fi
    }%
  \fi
\expandafter\x\csname ver@engord.sty\endcsname
\ProvidesPackage{engord}%
  [2016/05/16 v1.9 Provides English ordinal numbers (HO)]%
%    \end{macrocode}
%
% \subsection{Help commands for plain compatibility}
%
%    \begin{macrocode}
\begingroup\catcode61\catcode48\catcode32=10\relax%
  \catcode13=5 % ^^M
  \endlinechar=13 %
  \catcode123=1 % {
  \catcode125=2 % }
  \catcode64=11 % @
  \def\x{\endgroup
    \expandafter\edef\csname EO@AtEnd\endcsname{%
      \endlinechar=\the\endlinechar\relax
      \catcode13=\the\catcode13\relax
      \catcode32=\the\catcode32\relax
      \catcode35=\the\catcode35\relax
      \catcode61=\the\catcode61\relax
      \catcode64=\the\catcode64\relax
      \catcode123=\the\catcode123\relax
      \catcode125=\the\catcode125\relax
    }%
  }%
\x\catcode61\catcode48\catcode32=10\relax%
\catcode13=5 % ^^M
\endlinechar=13 %
\catcode35=6 % #
\catcode64=11 % @
\catcode123=1 % {
\catcode125=2 % }
\def\TMP@EnsureCode#1#2{%
  \edef\EO@AtEnd{%
    \EO@AtEnd
    \catcode#1=\the\catcode#1\relax
  }%
  \catcode#1=#2\relax
}
\TMP@EnsureCode{33}{12}% !
\TMP@EnsureCode{36}{3}% $
\TMP@EnsureCode{39}{12}% '
\TMP@EnsureCode{42}{12}% *
\TMP@EnsureCode{46}{12}% .
\TMP@EnsureCode{47}{12}% /
\TMP@EnsureCode{60}{12}% <
\TMP@EnsureCode{91}{12}% [
\TMP@EnsureCode{93}{12}% ]
\TMP@EnsureCode{94}{7}% ^(superscript)
\TMP@EnsureCode{96}{12}% `
\edef\EO@AtEnd{\EO@AtEnd\noexpand\endinput}
%    \end{macrocode}
%
%    \begin{macro}{\EO@def}
%    Definitions, \cs{newcommand} does not exist in \plainTeX.
%    \begin{macrocode}
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname newcommand\endcsname\relax
  \def\EO@def{\def}%
\else
  \def\EO@def#1{%
    \newcommand*{#1}{}%
    \def#1%
  }%
\fi
%    \end{macrocode}
%    \end{macro}
%    \begin{macrocode}
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname RequirePackage\endcsname\relax
  \input infwarerr.sty\relax
  \input ltxcmds.sty\relax
\else
  \RequirePackage{infwarerr}[2007/09/09]%
  \RequirePackage{ltxcmds}[2016/05/16]%
\fi
%    \end{macrocode}
%
% \subsection{User macros}
%
%    \begin{macro}{\ifengordraise}
%    The switch \cs{ifengordraise}, whether the ordinal letters
%    are raised or not. Default is raised because of compatibility.
%    \begin{macrocode}
\ltx@newif\ifengordraise
\engordraisetrue
%    \end{macrocode}
%    \end{macro}
%    In \LaTeX\ this also can be controlled by option \xoption{normal}
%    or \xoption{raise}.
%    \begin{macrocode}
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname DeclareOption\endcsname\relax
\else
  \DeclareOption{normal}{\engordraisefalse}%
  \DeclareOption{raise}{\engordraisetrue}%
  \ProcessOptions*\relax
\fi
%    \end{macrocode}
%
%    \begin{macro}{\engordletters}
%    \cs{engordletters} is called with one argument, the english
%    ordinal letters, and contains the code to format them. It
%    defaults to \cs{textsuperscript} depending on \cs{ifengordraise}.
%    \begin{macrocode}
\expandafter\ifx\csname engordletters\endcsname\relax
  \EO@def\engordletters{%
    \ifengordraise
      \expandafter\engordtextsuperscript
    \fi
  }%
\fi
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\engordtextsuperscript}
%    For \plainTeX\ the definition is quite ugly, redefine
%    \cs{engordtextsuperscript} if you have a better one.
%    \begin{macrocode}
\expandafter\ifx\csname engordtextsuperscript\endcsname\relax
  \begingroup\expandafter\expandafter\expandafter\endgroup
  \expandafter\ifx\csname textsuperscript\endcsname\relax
    \def\engordtextsuperscript#1{%
      \relax
      \ifmmode
        ^{\rm#1}%
      \else
        $^{\rm#1}$%
      \fi
    }%
  \else
    \def\engordtextsuperscript{\textsuperscript}%
  \fi
\fi
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\engorderror}
%    \cs{engorderror} is called, if the number is zero
%    or negative.
%    \begin{macrocode}
\expandafter\ifx\csname engorderror\endcsname\relax
  \EO@def\engorderror#1{%
    #1\engordletters{!ERROR!}%
    \@PackageWarning{engord}{%
      `#1' is not an ordinal number%
    }%
  }%
\fi
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\engord}
%    \cs{engord} expects a \LaTeX\ counter name as argument and
%    calls \cs{engordnumber}. It is defined only, if \LaTeX\ is used.
%    \begin{macrocode}
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname newcounter\endcsname\relax
\else
  \EO@def\engord#1{%
    \engordnumber{\value{#1}}%
  }%
\fi
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\engordnumber}
%    \cs{engordnumber} is the user command to print a number as
%    english ordinal number. The argument can be any
%    \TeX\ number like explicit numbers, register values, \dots
%
%    In a safe way it converts the \TeX\ number argument
%    into a form that only consists of decimal digits.
%    \begin{macrocode}
\EO@def\engordnumber#1{%
  \expandafter\EO@number\expandafter{\number#1}%
}
%    \end{macrocode}
%    \end{macro}
%
% \subsection{Suffix generation}
%
%    \begin{macro}{\EO@number}
%    \cs{EO@number} expects a number with decimal digits as
%    argument and looks at the size of the number and
%    the count of the digits:
%    \begin{macrocode}
\def\EO@number#1{%
  \ifnum#1<1 % handle the error case
    \engorderror{#1}%
  \else
    \ifnum#1<21 %
      \EO@ord{#1}%
    \else
      \ifnum#1<100 %
        \EO@twodigits#1%
      \else
        \@ReturnAfterFi{%
          \EO@reverse#1\@nil{}\EO@afterreverse
        }%
      \fi
    \fi
  \fi
}
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\@ReturnAfterFi}
%    An internal help macro to prevent a too deep \cs{if} nesting.
%    \begin{macrocode}
\long\def\@ReturnAfterFi#1\fi{\fi#1}
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\EO@ord}
%    \cs{EO@ord} prints the number with ord letters.\\
%    |#1|: decimal digits, |#1| $<$ 21
%    \begin{macrocode}
\def\EO@ord#1{%
  #1%
  \expandafter\engordletters
  \ifcase#1{th}\or
    {st}\or
    {nd}\or
    {rd}\else
    {th}%
  \fi
}
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\EO@twodigits}
%    \cs{EO@twodigits} expects a number with two digits,\\
%    20 $<$ number $<$ 100
%    \begin{macrocode}
\def\EO@twodigits#1#2{%
  #1\EO@ord{#2}%
}
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\EO@reverse}
%    \cs{EO@reverse} reverses the digits of the number.\\
%    |#1|: next digit\\
%    |#2|: rest of the digits\\
%    |#3|: already reversed digits\\
%    |#4|: next command to call with the reversed number
%    as argument
%    \begin{macrocode}
\def\EO@reverse#1#2\@nil#3#4{%
  \ifx\\#2\\%
    #4{#1#3}%
  \else
    \@ReturnAfterFi{%
      \EO@reverse#2\@nil{#1#3}{#4}%
    }%
  \fi
}
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\EO@afterreverse}
%    \cs{EO@afterreverse} calls \cs{EO@reverseback} so that
%    \cs{EO@reverseback} can inspect the digits of the number.
%    \begin{macrocode}
\def\EO@afterreverse#1{%
  \EO@reverseback#1\@nil
}
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\EO@reverseback}
%    \cs{EO@reverseback} reverses the reversion.\\
%    |#1|: the last digit of the number\\
%    |#2|: the second last digit of the number\\
%    |#3|: first digits of the number in reversed order,
%     it is not empty, because \cs{EO@reverseback} is
%     only called with numbers $>$ 100.
%    \begin{macrocode}
\def\EO@reverseback#1#2#3\@nil{%
  \EO@reverse#3\@nil{}\@firstofone
  \ifnum#2#1<21 %
    \EO@ord{#2#1}%
  \else
    #2\EO@ord{#1}%
  \fi
}
%    \end{macrocode}
%    \end{macro}
%
%    \begin{macrocode}
\EO@AtEnd%
%    \end{macrocode}
%
%    \begin{macrocode}
%</package>
%    \end{macrocode}
%% \section{Installation}
%
% \subsection{Download}
%
% \paragraph{Package.} This package is available on
% CTAN\footnote{\CTANpkg{engord}}:
% \begin{description}
% \item[\CTAN{macros/latex/contrib/oberdiek/engord.dtx}] The source file.
% \item[\CTAN{macros/latex/contrib/oberdiek/engord.pdf}] Documentation.
% \end{description}
%
%
% \paragraph{Bundle.} All the packages of the bundle `oberdiek'
% are also available in a TDS compliant ZIP archive. There
% the packages are already unpacked and the documentation files
% are generated. The files and directories obey the TDS standard.
% \begin{description}
% \item[\CTANinstall{install/macros/latex/contrib/oberdiek.tds.zip}]
% \end{description}
% \emph{TDS} refers to the standard ``A Directory Structure
% for \TeX\ Files'' (\CTANpkg{tds}). Directories
% with \xfile{texmf} in their name are usually organized this way.
%
% \subsection{Bundle installation}
%
% \paragraph{Unpacking.} Unpack the \xfile{oberdiek.tds.zip} in the
% TDS tree (also known as \xfile{texmf} tree) of your choice.
% Example (linux):
% \begin{quote}
%   |unzip oberdiek.tds.zip -d ~/texmf|
% \end{quote}
%
% \subsection{Package installation}
%
% \paragraph{Unpacking.} The \xfile{.dtx} file is a self-extracting
% \docstrip\ archive. The files are extracted by running the
% \xfile{.dtx} through \plainTeX:
% \begin{quote}
%   \verb|tex engord.dtx|
% \end{quote}
%
% \paragraph{TDS.} Now the different files must be moved into
% the different directories in your installation TDS tree
% (also known as \xfile{texmf} tree):
% \begin{quote}
% \def\t{^^A
% \begin{tabular}{@{}>{\ttfamily}l@{ $\rightarrow$ }>{\ttfamily}l@{}}
%   engord.sty & tex/generic/oberdiek/engord.sty\\
%   engord.pdf & doc/latex/oberdiek/engord.pdf\\
%   engord.dtx & source/latex/oberdiek/engord.dtx\\
% \end{tabular}^^A
% }^^A
% \sbox0{\t}^^A
% \ifdim\wd0>\linewidth
%   \begingroup
%     \advance\linewidth by\leftmargin
%     \advance\linewidth by\rightmargin
%   \edef\x{\endgroup
%     \def\noexpand\lw{\the\linewidth}^^A
%   }\x
%   \def\lwbox{^^A
%     \leavevmode
%     \hbox to \linewidth{^^A
%       \kern-\leftmargin\relax
%       \hss
%       \usebox0
%       \hss
%       \kern-\rightmargin\relax
%     }^^A
%   }^^A
%   \ifdim\wd0>\lw
%     \sbox0{\small\t}^^A
%     \ifdim\wd0>\linewidth
%       \ifdim\wd0>\lw
%         \sbox0{\footnotesize\t}^^A
%         \ifdim\wd0>\linewidth
%           \ifdim\wd0>\lw
%             \sbox0{\scriptsize\t}^^A
%             \ifdim\wd0>\linewidth
%               \ifdim\wd0>\lw
%                 \sbox0{\tiny\t}^^A
%                 \ifdim\wd0>\linewidth
%                   \lwbox
%                 \else
%                   \usebox0
%                 \fi
%               \else
%                 \lwbox
%               \fi
%             \else
%               \usebox0
%             \fi
%           \else
%             \lwbox
%           \fi
%         \else
%           \usebox0
%         \fi
%       \else
%         \lwbox
%       \fi
%     \else
%       \usebox0
%     \fi
%   \else
%     \lwbox
%   \fi
% \else
%   \usebox0
% \fi
% \end{quote}
% If you have a \xfile{docstrip.cfg} that configures and enables \docstrip's
% TDS installing feature, then some files can already be in the right
% place, see the documentation of \docstrip.
%
% \subsection{Refresh file name databases}
%
% If your \TeX~distribution
% (\TeX\,Live, \mikTeX, \dots) relies on file name databases, you must refresh
% these. For example, \TeX\,Live\ users run \verb|texhash| or
% \verb|mktexlsr|.
%
% \subsection{Some details for the interested}
%
% \paragraph{Unpacking with \LaTeX.}
% The \xfile{.dtx} chooses its action depending on the format:
% \begin{description}
% \item[\plainTeX:] Run \docstrip\ and extract the files.
% \item[\LaTeX:] Generate the documentation.
% \end{description}
% If you insist on using \LaTeX\ for \docstrip\ (really,
% \docstrip\ does not need \LaTeX), then inform the autodetect routine
% about your intention:
% \begin{quote}
%   \verb|latex \let\install=y\input{engord.dtx}|
% \end{quote}
% Do not forget to quote the argument according to the demands
% of your shell.
%
% \paragraph{Generating the documentation.}
% You can use both the \xfile{.dtx} or the \xfile{.drv} to generate
% the documentation. The process can be configured by the
% configuration file \xfile{ltxdoc.cfg}. For instance, put this
% line into this file, if you want to have A4 as paper format:
% \begin{quote}
%   \verb|\PassOptionsToClass{a4paper}{article}|
% \end{quote}
% An example follows how to generate the
% documentation with pdf\LaTeX:
% \begin{quote}
%\begin{verbatim}
%pdflatex engord.dtx
%makeindex -s gind.ist engord.idx
%pdflatex engord.dtx
%makeindex -s gind.ist engord.idx
%pdflatex engord.dtx
%\end{verbatim}
% \end{quote}
%
% \begin{History}
%   \begin{Version}{2000/05/23 v1.0}
%   \item
%     First public release, published in newsgroup \xnewsgroup{de.comp.text.tex}:\\
%     \URL{``\link{Re: Ordinalzahlen in LaTeX?}''}^^A
%     {https://groups.google.com/group/de.comp.text.tex/msg/738e2cb4c51759d6}
%   \end{Version}
%   \begin{Version}{2003/04/28 v1.1}
%   \item
%     Bug fix for 30, 40, 50, \dots, 100, 130, \dots
%   \item
%     \cs{ordletters} renamed to documented \cs{engordletters}.
%   \end{Version}
%   \begin{Version}{2006/02/20 v1.2}
%   \item
%     Support for \plainTeX.
%   \item
%     Switch \cs{ifengordraise} added.
%   \item
%     Package options \xoption{raise} and \xoption{normal} added.
%   \item
%     DTX framework.
%   \end{Version}
%   \begin{Version}{2007/04/11 v1.3}
%   \item
%     Line ends sanitized.
%   \end{Version}
%   \begin{Version}{2007/04/26 v1.4}
%   \item
%     Use of package \xpackage{infwarerr}.
%   \end{Version}
%   \begin{Version}{2007/09/09 v1.5}
%   \item
%     Catcode section added.
%   \end{Version}
%   \begin{Version}{2007/09/20 v1.6}
%   \item
%     Short description fixed (George White).
%   \end{Version}
%   \begin{Version}{2008/08/11 v1.7}
%   \item
%     Code is not changed.
%   \item
%     URLs updated.
%   \end{Version}
%   \begin{Version}{2010/03/01 v1.8}
%   \item
%     Compatibility with \iniTeX.
%   \end{Version}
%   \begin{Version}{2016/05/16 v1.9}
%   \item
%     Documentation updates.
%   \end{Version}
% \end{History}
%
% \PrintIndex
%
% \Finale
\endinput