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%D \module
%D [ file=syst-con,
%D version=2006.09.16, % real old stuff ... 2000.12.10
%D title=\CONTEXT\ System Macros,
%D subtitle=Conversions,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\registerctxluafile{syst-con}{1.001}
\unprotect
%D When the number of conversions grew, it did no longer make
%D sense to spread them over multiple files. So, instead of
%D defining these in \type {font-ini}, we now have a dedicated
%D module.
%D \macros
%D {lchexnumber,uchexnumber,lchexnumbers,uchexnumbers}
%D
%D In addition to the uppercase hex conversion, as needed in
%D math families, we occasionally need a lowercase one, for
%D instance when we want to compose gbsong fontnames.
%D
%D The ugly indirectness is needed to get rid of \TEX\
%D induced spaces and \type {\relax}'s.
%D
%D \starttyping
%D [\uchexnumber{0}]
%D [\uchexnumber\scratchcounter]
%D [\uchexnumber\zerocount]
%D [\uchexnumber{\number0}]
%D [\uchexnumber{\number\scratchcounter}]
%D [\uchexnumber{\number\zerocount}]
%D [\uchexnumber{\the\scratchcounter}]
%D [\uchexnumber{\the\zerocount}]
%D [\expandafter\uchexnumber\expandafter{\number0}]
%D [\expandafter\uchexnumber\expandafter{\number\scratchcounter}]
%D [\expandafter\uchexnumber\expandafter{\number\zerocount}]
%D [\expandafter\uchexnumber\expandafter{\the\scratchcounter}]
%D [\expandafter\uchexnumber\expandafter{\the\zerocount}]
%D \stoptyping
\def\lchexnumber #1{\clf_lchexnumber \numexpr#1\relax}
\def\uchexnumber #1{\clf_uchexnumber \numexpr#1\relax}
\def\lchexnumbers#1{\clf_lchexnumbers\numexpr#1\relax}
\def\uchexnumbers#1{\clf_uchexnumbers\numexpr#1\relax}
\let\hexnumber\uchexnumber
%D \macros
%D {octnumber}
%D
%D For unicode remapping purposes, we need octal numbers.
\def\octnumber#1{\clf_octnumber\numexpr#1\relax}
%D \macros
%D {hexstringtonumber,octstringtonumber}
%D
%D This macro converts a two character hexadecimal number into
%D a decimal number, thereby taking care of lowercase characters
%D as well.
\def\hexstringtonumber#1{\clf_hexstringtonumber\numexpr#1\relax}
\def\octstringtonumber#1{\clf_octstringtonumber\numexpr#1\relax}
%D \macros
%D {rawcharacter}
%D
%D This macro can be used to produce proper 8 bit characters
%D that we sometimes need in backends and round||trips.
\def\rawcharacter#1{\clf_rawcharacter\numexpr#1\relax}
%D \macros
%D {twodigits, threedigits}
%D
%D These macros provides two or three digits always:
\def\twodigits #1{\ifnum #1<10 0\fi\number#1}
\def\threedigits#1{\ifnum#1<100 \ifnum#1<10 0\fi0\fi\number#1}
%D \macros{modulonumber}
%D
%D In the conversion macros described in \type {core-con} we
%D need a wrap||around method. The following solution is
%D provided by Taco.
%D
%D The \type {modulonumber} macro expands to the mathematical
%D modulo of a positive integer. It is crucial for it's
%D application that this macro is fully exandable.
%D
%D The expression inside the \type {\numexpr} itself is
%D somewhat bizarre because \ETEX\ uses a rounding
%D division instead of truncation. If \ETEX's division
%D would have behaved like \TEX's normal\type{\divide}, then
%D the expression could have been somewhat simpler, like
%D \type {#2-(#2/#1)*#1}. This works just as well, but a bit
%D more complex.
\def\modulonumber#1#2%
{\the\numexpr#2-((((#2+(#1/2))/#1)-1)*#1)\relax}
%D \macros{modulatednumber}
%D
%D Modulo numbers run from zero to one less than the limit,
%D but for conversion sets, we need a value between 1 and the
%D limit. The \type{\modulatednumber} arranges that. This
%D macro also needs to be fully expandable, resulting in
%D two \type{\numexpr}s.
\def\modulatednumber#1#2%
{\ifnum\the\numexpr\modulonumber{#1}{#2}\relax=0 #1%
\else \the\numexpr\modulonumber{#1}{#2}\relax \fi}
%D \macros
%D {realnumber} % used?
\def\realnumber#1{\withoutpt\the\dimexpr#1\s!pt\relax} % brrr
%D \macros
%D {setcalculatedsin,setcalculatedcos,setcalculatedtan}
\def\setcalculatedsin#1#2{\edef#1{\clf_sind#2}}
\def\setcalculatedcos#1#2{\edef#1{\clf_cosd#2}}
\def\setcalculatedtan#1#2{\edef#1{\clf_tand#2}}
\def\formatted#1{\ctxcommand{format(#1)}} % not clf
\unexpanded\def\format #1{\ctxcommand{format(#1)}} % not clf
\protect \endinput
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