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
|
\catcode`\@=11 % use the private prefix ``II@''
\newif\ifII@itis % main result of the macro
%% helper macros
\def\II@rmsign #1{\ifx#1+\else\ifx#1-\else
\II@endrm#1\fi\fi\II@rmsign}
\def\II@endrm #1\fi\fi#2{\fi\fi#1}
\def\II@zeros #1{\ifx#1''\else\ifx#1""\else
\II@cont#1\fi\fi\II@zeros}
\def\II@cont #1\fi\fi#2{\fi\fi\II@hdlzero#1}
\def\II@hdlzero #1{\ifx#10 \else
\II@xchgfi #1\fi\II@hdlzero}
\def\II@xchgfi #1\fi#2{\fi\ifx#1`\else0\fi#1}
%% constants with the sentinel `W'
\def\II@cfd{02147483647W}% canonical forms with
\def\II@cfh{"07FFFFFFFW}% W of TeX's max integer
\def\II@cfo{'017777777777W}% in dec, hex, oct
\def\II@W{W}\def\II@hexW{"W}% all unsigned input
\def\II@octW{'W}% with W for which TeX inserts 0
%% assignments
\let\Boolend=\iffalse \font\II@font=cmr10
\let\IIcurrentmode=\errorstopmode % CONFIGURE
%% main macro
\def\ifisint #1\Boolend{\II@itisfalse % see S1.2
\edef\II@digs{\II@rmsign#1W}% S1.1 with 2 \edef
\edef\II@digs{\expandafter\II@rmsign\II@digs}%
\ifx\II@digs\II@W\else\ifx\II@digs\II@octW
\else\ifx\II@digs\II@hexW\else % S1.2 finished
\edef\II@cf{\expandafter\II@zeros\II@digs}% S2
\wlog{=== start ignore}\batchmode\begingroup
\setbox0=\hbox{\count255=\II@cf
\xdef\II@val{\the\count255}}%
\setbox0=\hbox{\II@font\count255=#1W}% S3.1
\xdef\II@wd{\the\wd0}%
\endgroup\IIcurrentmode\wlog{=== stop ignore}%
\ifdim\II@wd=10.2778pt % \wd of hbox `W'; S3.2
\II@itistrue \ifnum\II@val=2147483647 % S4.1
\ifx\II@cf\II@cfd
\else\ifx\II@cf\II@cfh
\else\ifx\II@cf\II@cfo % S4.2
\else \II@itisfalse % S4.3
\fi\fi\fi\fi
\else \II@itisfalse % S3.3
\fi\fi\fi\fi \ifII@itis}
\catcode`\@=12
|
