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%D \module
%D [ file=typo-tal, % spac-cha (2012.06.08) supp-ali (2000.04.17)
%D version=2013.10.04,
%D title=\CONTEXT\ Typesetting Macros,
%D subtitle=Character Alignment,
%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.
\writestatus{loading}{ConTeXt Typesetting Macros / Character Alignment}
%D This module replaces the \MKII\ character alignment code which hooked into
%D table mechanisms but used parsing. In fact, this might be one of these cases
%D where a \TEX\ based solution is faster, but a \LUA\ one a bit more robust.
%D Anyway, as I had to fix something (to fit the newer table mechanisms) I
%D decided to go the mixed route, a rather easy going effort in the aftermath of
%D the 2013 \CONTEXT\ meeting.
\unprotect
\registerctxluafile{typo-tal}{1.001}
\definesystemattribute[characteralign][public]
%D This mechanism is mostly meant for tables:
%D
%D \startbuffer
%D \starttabulate[|l|g{,}|r|]
%D \NC test \NC 1.234.456,99 \NC \NC test \NR
%D \NC test \NC 234.456,9 \NC \NC test \NR
%D \NC test \NC 234.456 \NC \NC test \NR
%D \NC test \NC 456 \NC \NC test \NR
%D \NC test \NC \bf whatever \NC \NC test \NR
%D \stoptabulate
%D \stopbuffer
%D
%D \typebuffer \blank \getbuffer \blank
%D \startbuffer
%D \bTABLE
%D \bTR \bTD[aligncharacter=yes] € 1,1 \eTD \eTR
%D \bTR \bTD[aligncharacter=yes] € 11,11 \eTD \eTR
%D \bTR \bTD[aligncharacter=yes] € 12\punctuationspace111,11 \eTD \eTR
%D \bTR \bTD[aligncharacter=yes] € 12 111,11 \eTD \eTR
%D \bTR \bTD[aligncharacter=yes] € 1.234.451,22222 \eTD \eTR
%D \bTR \bTD[aligncharacter=yes] € 234.451,2 \eTD \eTR
%D \bTR \bTD[aligncharacter=yes] € 234.451 \eTD \eTR
%D \bTR \bTD[aligncharacter=yes] € 451 \eTD \eTR
%D \bTR \bTD \bf some text \eTD \eTR
%D \eTABLE
%D \stopbuffer
%D
%D \typebuffer \blank \getbuffer \blank
\unexpanded\def\signalcharacteralign#1#2{\attribute\characteralignattribute=\numexpr#1*\plushundred+#2\relax}
\unexpanded\def\setcharacteralign #1#2{\ctxcommand{setcharacteralign(\number#1,"#2")}}
\unexpanded\def\resetcharacteralign {\ctxcommand{resetcharacteralign()}}
%D Mostly downward compatible:
%D
%D \startbuffer
%D \startcharacteralign
%D \checkcharacteralign{123.456,78}
%D \checkcharacteralign{456}
%D \checkcharacteralign{23.456}
%D \checkcharacteralign{78,9}
%D \stopcharacteralign
%D \stopbuffer
%D
%D \typebuffer \blank \getbuffer \blank
\def\alignmentcharacter{,}
\unexpanded\def\typo_charalign_pass_one
{\advance\scratchcounter\plusone
\setbox\scratchbox\typo_charalign_pass}
\unexpanded\def\typo_charalign_pass_two
{\advance\scratchcounter\plusone
\typo_charalign_pass}
\def\typo_charalign_pass
{\hbox\bgroup\signalcharacteralign\plusone\scratchcounter\let\next}
\unexpanded\def\startcharacteralign#1\stopcharacteralign
{\bgroup
\setcharacteralign\plusone\alignmentcharacter
\begingroup
\scratchcounter\zerocount
\let\checkcharacteralign\typo_charalign_pass_one
\settrialtypesetting
#1\relax
\endgroup
\begingroup
\scratchcounter\zerocount
\let\checkcharacteralign\typo_charalign_pass_two
#1\relax
\endgroup
\resetcharacteralign
\egroup}
\let\stopcharacteralign \relax
\let\checkcharacteralign\gobbleoneargument
\def\setfirstpasscharacteralign {\let\checkcharacteralign\gobbleoneargument}
\def\setsecondpasscharacteralign{\let\checkcharacteralign\firstofoneargument}
%D We need fonts to provide tabular digits that is, the digits need to have the same
%D width.
%D
%D \startbuffer
%D \startbuffer[demo]
%D \switchtobodyfont[pagella]
%D \setupTABLE[column][1][alignmentcharacter=.,aligncharacter=yes]
%D \bTABLE
%D \bTR \bTD 11.111 \eTD \bTD 11.111 \eTD \eTR
%D \bTR \bTD 2.2 \eTD \bTD 2.2 \eTD \eTR
%D \bTR \bTD 444.444 \eTD \bTD 444.444 \eTD \eTR
%D \eTABLE
%D \stopbuffer
%D
%D \start inlinenumbers: \crlf \addfeature[inlinenumbers] \getbuffer \stop
%D \start tabularnumbers: \crlf \addfeature[tabularnumbers] \getbuffer \stop
%D \start oldstylenumbers:\crlf \addfeature[oldstylenumbers] \getbuffer \stop
%D \stopbuffer
%D
%D \enabledirectives[typesetters.characteralign.autofont]
%D \typebuffer \blank \getbuffer \blank
%D \disabledirectives[typesetters.characteralign.autofont]
%D \typebuffer \blank \getbuffer \blank
%D \enabledirectives[typesetters.characteralign.autofont]
\definefontfeature
[system:tabnum]
[tnum=yes,
lnum=no]
\newconditional\c_tabl_ntb_char_align_auto_font \settrue\c_tabl_ntb_char_align_auto_font
\installtexdirective % yes or no ?
{typesetters.characteralign.autofont}
{\settrue \c_tabl_ntb_char_align_auto_font}
{\setfalse\c_tabl_ntb_char_align_auto_font}
\def\m_font_feature_auto_tabnum{system:tabnum}
\unexpanded\def\typo_charalign_adapt_font_indeed
{\let\m_font_feature_asked\m_font_feature_auto_tabnum
\font_feature_reset_add_indeed}
\def\typo_charalign_adapt_font % slow but seldom used (expanded in preamble)
{\ifconditional\c_tabl_ntb_char_align_auto_font
\typo_charalign_adapt_font_indeed
\fi}
\protect \endinput
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