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1%D \module
2%D   [       file=syst-con,
3%D        version=2006.09.16, % real old stuff ... 2000.12.10
4%D          title=\CONTEXT\ System Macros,
5%D       subtitle=Conversions,
6%D         author=Hans Hagen,
7%D           date=\currentdate,
8%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
9%C
10%C This module is part of the \CONTEXT\ macro||package and is
11%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
12%C details.
13
14\registerctxluafile{syst-con}{}
15
16\unprotect
17
18%D \macros{lchexnumber,uchexnumber,lchexnumbers,uchexnumbers}
19%D
20%D In addition to the uppercase hex conversion, as needed in math families, we
21%D occasionally need a lowercase one.
22
23\permanent\def\lchexnumber #1{\clf_lchexnumber \numexpr#1\relax}
24\permanent\def\uchexnumber #1{\clf_uchexnumber \numexpr#1\relax}
\permanent\def\lchexnumbers#1{\clf_lchexnumbers\numexpr#1\relax}
\permanent\def\uchexnumbers#1{\clf_uchexnumbers\numexpr#1\relax}
27
28\aliased\let\hexnumber\uchexnumber
29
30%D \macros{octnumber}
31%D
32%D For \UNICODE\ remapping purposes, we need octal numbers.
33
34\permanent\def\octnumber#1{\clf_octnumber\numexpr#1\relax}
35
36%D \macros{hexstringtonumber,octstringtonumber}
37%D
38%D This macro converts a two character hexadecimal number into a decimal number,
39%D thereby taking care of lowercase characters as well.
40
41\permanent\def\hexstringtonumber#1{\clf_hexstringtonumber\numexpr#1\relax}
42\permanent\def\octstringtonumber#1{\clf_octstringtonumber\numexpr#1\relax}
43
44%D \macros{twodigits, threedigits}
45%D
46%D These macros provides two or three digits always:
47
48\permanent\def\twodigits  #1{\ifnum             #1<10     0\fi\number#1}
49\permanent\def\threedigits#1{\ifnum#1<100 \ifnum#1<10 0\fi0\fi\number#1}
50
51%D \macros{modulonumber}
52%D
53%D In the conversion macros described in \type {core-con} we need a wrap||around
54%D method. The following solution is provided by Taco.
55%D
56%D The \type {modulonumber} macro expands to the mathematical modulo of a positive
57%D integer. It is crucial for it's application that this macro is fully exandable.
58%D
59%D The expression inside the \type {\numexpr} itself is somewhat bizarre because
60%D \ETEX\ uses a rounding division instead of truncation. If \ETEX's division would
61%D have behaved like \TEX's normal\type {\divide}, then the expression could have
62%D been somewhat simpler, like \type {#2-(#2/#1)*#1}. This works just as well, but a
63%D bit more complex.
64
65%permanent\def\modulonumber#1#2{\the\numexpr#2-((((#2+(#1/2))/#1)-1)*#1)\relax}
66%permanent\def\modulonumber#1#2{\the\numexpr#2-(#2:#1)*#1\relax}
67
68%D \macros{setcalculatedsin,setcalculatedcos,setcalculatedtan}
69
70\permanent\protected\def\setcalculatedsin#1#2{\edef#1{\clf_sind#2}}
71\permanent\protected\def\setcalculatedcos#1#2{\edef#1{\clf_cosd#2}}
72\permanent\protected\def\setcalculatedtan#1#2{\edef#1{\clf_tand#2}}
73
74%D \macros{formatted,format}
75
76\permanent          \def\formatted#1{\ctxcommand{format(#1)}} % not clf
77\permanent\protected\def\format   #1{\ctxcommand{format(#1)}} % not clf
78
79%D The \type {\modulatednumber} and \type {\realnumber} macros have been removed.
80
81%D \macros{tobits}
82%D
83%D Thso macro expects a number of bits, chunk size and the number.
84%D
85%D \starttyping
86%D \tobits 32 4 "00000003
87%D \stoptyping
88
89\protect \endinput
90