%D \module
%D   [       file=core-con,
%D        version=1997.26.08,
%D          title=\CONTEXT\ Core Macros,
%D       subtitle=Conversion,
%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 Core Macros / Conversion}

\registerctxluafile{core-con}{autosuffix}

% todo: iso date ranges (from/to)

\unprotect

\ifdefined\currentlanguage \else \lettonothing\currentlanguage     \fi
\ifdefined\labeltext       \else \let\labeltext\firstofoneargument \fi

%D This module deals with all kind of conversions from numbers and dates. I
%D considered splitting this module in a support one and a core one, but to keep
%D things simple as well as preserve the overview, I decided against splitting.

\aliased\let\spr\firstofoneargument % separator
\aliased\let\stp\firstofoneargument % stopper

% needed for arab (but can disappear as no ons used it, experiment for idris)

\permanent\protected\def\isolateseparators % even works with list separator overloading
  {\enforced\permanent\def\spr##1{{##1}}%  % we can probably best mess around with zwj
   \enforced\permanent\def\stp##1{{##1}}}  % and friends

%D \macros
%D   {numbers}
%D
%D First we deal with the dummy conversion of numbers using the \TEX\ primitive
%D \type{\number}. The uppercase alternative is only there for compatibility with
%D the other conversion macros. We could do without \type{#1} but this way we get
%D rid of unwanted braces. For the savety we also define a non||sence uppercase
%D alternative.
%D
%D \showsetup{numbers}
%D
%D \starttyping
%D \def\numbers#1{\number#1}
%D \def\Numbers#1{\number#1}
%D \stoptyping
%D
%D Due to read ahead, as in \type{[\pagenumber\space]} the space will disappear,
%D unless we use:

\permanent\def\numbers#1{\purenumber{#1}}
\permanent\def\Numbers#1{\purenumber{#1}}

%D \macros
%D   {romannumerals,Romannumerals}
%D
%D \TEX\ the program uses a rather tricky conversion from numbers to their roman
%D counterparts. This conversion could of course be programmed in \TEX\ itself, but
%D I guess Knuth found the programming trick worth presenting.
%D
%D \showsetup{romannumerals}
%D \showsetup{Romannumerals}

\permanent\def\romannumerals#1{\clf_romannumerals{#1}}
\permanent\def\Romannumerals#1{\clf_Romannumerals{#1}}

%D Arabic  etc:

\permanent\def\abjadnumerals     #1{\clf_abjadnumerals     {#1}}
\permanent\def\abjadnodotnumerals#1{\clf_abjadnodotnumerals{#1}}
\permanent\def\abjadnaivenumerals#1{\clf_alphabetic        {#1}{arabic}} % okay?

\permanent\def\hebrewnumerals    #1{\clf_hebrewnumerals{#1}}
\aliased  \let\yiddishnumerals      \hebrewnumerals

\permanent\def\languagecharacters#1{\clf_alphabetic{#1}{\currentlanguage}} % new
\permanent\def\languageCharacters#1{\clf_Alphabetic{#1}{\currentlanguage}} % new

\permanent\def\alphabeticnumerals#1{\clf_alphabetic{#1}{}}
\permanent\def\Alphabeticnumerals#1{\clf_Alphabetic{#1}{}}

\permanent\def\thainumerals      #1{\clf_alphabetic{#1}{thai}}
\permanent\def\devanagarinumerals#1{\clf_decimals  {#1}{devanagari}}
\permanent\def\malayalamnumerals #1{\clf_decimals  {#1}{malayalam}}
\permanent\def\tamilnumerals     #1{\clf_decimals  {#1}{tamil}}
\permanent\def\kannadanumerals   #1{\clf_decimals  {#1}{kannada}}
\permanent\def\telugunumerals    #1{\clf_decimals  {#1}{telugu}}
\permanent\def\bengalinumerals   #1{\clf_decimals  {#1}{bengali}}
\permanent\def\gujaratinumerals  #1{\clf_decimals  {#1}{gujarati}}
\permanent\def\gurmurkhinumerals #1{\clf_decimals  {#1}{gurmurkhi}}
\permanent\def\tibetannumerals   #1{\clf_alphabetic{#1}{tibetan}}
\permanent\def\greeknumerals     #1{\clf_alphabetic{#1}{greek}}
\permanent\def\Greeknumerals     #1{\clf_Alphabetic{#1}{greek}}
\permanent\def\arabicnumerals    #1{\clf_alphabetic{#1}{arabic}}
\permanent\def\persiannumerals   #1{\clf_alphabetic{#1}{persian}}
\permanent\def\arabicdecimals    #1{\clf_decimals  {#1}{arabic}}
\permanent\def\persiandecimals   #1{\clf_decimals  {#1}{persian}}

\permanent\def\mathgreeknumerals #1{\im{\clf_alphabetic{#1}{greek}}}
\permanent\def\mathGreeknumerals #1{\im{\clf_Alphabetic{#1}{greek}}}

\aliased  \let\arabicexnumerals     \persiannumerals

\permanent\def\koreannumerals    #1{\clf_alphabetic{#1}{korean}}
\permanent\def\koreannumeralsp   #1{\clf_alphabetic{#1}{korean-parenthesis}}
\permanent\def\koreannumeralsc   #1{\clf_alphabetic{#1}{korean-circle}}

\aliased  \let\koreanparentnumerals     \koreannumeralsp
\aliased  \let\koreanparenthesisnumerals\koreannumeralsp
\aliased  \let\koreancirclenumerals     \koreannumeralsc

\permanent\def\chinesenumerals    #1{\clf_chinesenumerals{#1}{normal}}
\permanent\def\chinesecapnumerals #1{\clf_chinesenumerals{#1}{cap}}
\permanent\def\chineseallnumerals #1{\clf_chinesenumerals{#1}{all}}
\permanent\def\chinesedatenumerals#1{\clf_chinesenumerals{#1}{date}}

%D \macros
%D   {character,Character}
%D
%D Converting a number into a character can of course only be done with numbers
%D less or equal to~26. At the cost of much more macros a faster conversion is
%D possible, using:
%D
%D \starttyping
%D \setvalue{char1}{a} \def\character#1{\getvalue{char#1}}
%D \stoptyping
%D
%D But we prefer a simpel \type{\case}.
%D
%D \showsetup{character}
%D \showsetup{Character}

\permanent\def\character#1{\clf_character{#1}}
\permanent\def\Character#1{\clf_Character{#1}}

%D \macros
%D   {characters,Characters}
%D
%D Converting large numbers is supported by the next two macros. This time we
%D just count on: $\cdots$~x, y, z, aa, ab, ac~$\cdots$.
%D
%D \showsetup{characters}
%D \showsetup{Characters}

\permanent\def\characters#1{\clf_characters{#1}}
\permanent\def\Characters#1{\clf_Characters{#1}}

%D \macros
%D   {greeknumerals,Greeknumerals}
%D
%D Why should we only honour the romans, and not the greek?

% \let\greeknumerals\gobbleoneargument
% \let\Greeknumerals\gobbleoneargument

%D \macros
%D   {oldstylenumerals,oldstyleromannumerals}
%D
%D These conversions are dedicated to Frans Goddijn.

\permanent\protected\def\oldstylenumerals#1%
  {\begingroup
   \os\number#1%
   \endgroup}

\permanent\protected\def\oldstyleromannumerals#1% will become obsolete
  {\dontleavehmode
   \hbox\bgroup
   \ss\txx
   \setbox\scratchbox\hbox \s!spread .15\emwidth{\hss\uppercased{\romannumerals{#1}}\hss}%
   \scratchwidth \wd\scratchbox
   \scratchheight\ht\scratchbox
   \scratchdimen .1\exheight
   \vrule
     \s!width \scratchwidth
     \s!height{\scratchheight+\scratchdimen}%
     \s!depth {-\scratchheight+\scratchdimen}%
   \relax
   \hskip-\scratchwidth
   \vrule
     \s!width \scratchwidth
     \s!height\scratchdimen
     \s!depth \scratchdimen
   \relax
   \hskip-\scratchwidth
   \box\scratchbox
   \egroup}

%D \macros
%D   {normaltime,normalyear,normalmonth,normalday}
%D
%D The last part of this module is dedicated to converting dates. Because we want to
%D use as meaningful commands as possible, and because \TEX\ already uses up some of
%D those, we save the original meanings. The above are defined already.

%D \macros
%D   {month,MONTH}
%D
%D Converting the month number into a month name is done using a case statement,
%D abstact values and the label mechanism. This way users can easily redefine a
%D label from for instance german into austrian.
%D
%D \starttyping
%D \setuplabeltext [de] [january=J\"anner]
%D \stoptyping
%D
%D Anyhow, the conversion looks like:

\permanent\protected\def\monthlong #1{\clf_monthname{#1}}
\permanent\protected\def\monthshort#1{\clf_monthmnem{#1}}
\permanent\protected\def\daylong   #1{\clf_dayname{#1}}
\permanent\protected\def\dayshort  #1{\clf_daymnem{#1}}
\aliased            \let\convertmonth\monthlong % for old times sake

%D We redefine the \TEX\ primitive \type{\month} as:
%D
%D \showsetup{month}
%D \showsetup{MONTH}

\pushoverloadmode

\aliased\let\month\monthlong

\popoverloadmode

\permanent\protected\def\MONTH     #1{\WORD{\clf_monthname{#1}}}
\permanent\protected\def\MONTHLONG #1{\WORD{\clf_monthname{#1}}}
\permanent\protected\def\MONTHSHORT#1{\WORD{\clf_monthmnem{#1}}}

%D We never explicitly needed this, but Tobias Burnus pointed out that it would be
%D handy to convert to the day of the week. In doing so, we have to calculate the
%D total number of days, taking leapyears into account. For those who are curious:
%D
%D \startitemize[packed]
%D \item  years that can be divided by 4 are leapyears
%D \item  exept years that can be divided by 100
%D \item  unless years can be divided by 400
%D \stopitemize

%D \macros
%D   {weekday,WEEKDAY}
%D
%D The first one is sort of redundant. It takes the day number argument.
%D
%D \showsetup{weekday}
%D \showsetup{WEEKDAY}

\permanent\protected\def\weekday #1{\clf_dayname{#1}}
\permanent\protected\def\WEEKDAY #1{\WORD{\clf_dayname{#1}}}
\permanent\protected\def\DAYLONG #1{\WORD{\clf_dayname{#1}}}
\permanent\protected\def\DAYSHORT#1{\WORD{\clf_daymnem{#1}}}

%D \macros
%D   {getdayoftheweek, dayoftheweek}

\newcount\normalweekday

\permanent          \def\dayoftheweek   #1#2#3{\clf_weekdayname{#1}{#2}{#3}}                 % name
\permanent\protected\def\getdayoftheweek#1#2#3{\normalweekday\clf_weekday{#1}{#2}{#3}\relax} % number

%D Using this macro in
%D
%D \startbuffer
%D monday:   \dayoftheweek  {4} {5} {1992}
%D friday:   \dayoftheweek {16} {6} {1995}
%D monday:   \dayoftheweek {25} {8} {1997}
%D saturday: \dayoftheweek {30} {8} {1997}
%D tuesday:  \dayoftheweek  {2} {1} {1996}
%D tuesday:  \dayoftheweek  {7} {1} {1997}
%D tuesday:  \dayoftheweek {13} {1} {1998}
%D friday:   \dayoftheweek  {1} {1} {2000}
%D \stopbuffer
%D
%D \typebuffer
%D
%D gives
%D
%D \startlines
%D \getbuffer
%D \stoplines
%D
%D The macro \type {\getdayoftheweek} can be used to calculate the number \type
%D {\normalweekday}.

%D \macros
%D   {doifleapyearelse,
%D    getdayspermonth}
%D
%D Sometimes we need to know if we're dealing with a leapyear, so here is a
%D testmacro:
%D
%D \starttyping
%D \doifleapyearelse{year}{yes}{no}
%D \stoptyping
%D
%D An example of its use can be seen in the macro
%D
%D \starttyping
%D \getdayspermonth{year}{month}
%D \stoptyping
%D
%D The number of days is available in the macro \type {\numberofdays}.

\permanent\def\doifelseleapyear#1% expandable check
  {\clf_doifelseleapyear{#1}}

\aliased\let\doifleapyearelse\doifelseleapyear

\mutable\let\numberofdays\!!zerocount

\permanent\protected\def\getdayspermonth#1#2%
  {\edef\numberofdays{\clf_nofdays{#1}{#2}}}

\permanent\def\dayspermonth#1#2%
  {\clf_nofdays{#1}{#2}}

% \dayoftheweek{2006}{9}{15}
% \doifleapyearelse{2000}{OK}{NOT OK}
% \doifleapyearelse{2100}{NOT OK}{OK}
% \doifleapyearelse{2004}{OK}{NOT OK}
% \doifleapyearelse{2003}{NOT OK}{OK}
% \dayspermonth{2000}{2}
% [\the\normaltime=\the\time]

%D \macros
%D   {currentdate, rawdate, date}
%D
%D We use these conversion macros in the date formatting macro:
%D
%D \showsetup{currentdate}
%D
%D This macro takes care of proper spacing and delivers for instance:
%D
%D \startbuffer
%D \currentdate[weekday,day,month,year]
%D \currentdate[WEEKDAY,day,MONTH,year]
%D \stopbuffer
%D
%D \startlines
%D \getbuffer
%D \stoplines
%D
%D depending of course on the keywords. Here we gave:
%D
%D \typebuffer
%D
%D If needed one can also add non||keywords, like in
%D
%D \startbuffer
%D \currentdate[dd,--,mm,--,yy]
%D \stopbuffer
%D
%D \typebuffer
%D
%D or typeset: \getbuffer.
%D
%D When no argument is passed, the current date is given as specified per
%D language (using \type{\installlanguage}).
%D
%D \showsetup{currentdate}
%D
%D \startbuffer
%D \date
%D \date[d=12,m=12,y=1998][weekday]
%D \date[d=12,m=12,y=1998]
%D \stopbuffer
%D
%D We can also typeset arbitrary dates, using the previous
%D command.
%D
%D \typebuffer
%D
%D The date is specified by one character keys. When no date is given, we get the
%D current date.
%D
%D \startlines
%D \getbuffer
%D \stoplines

%D \starttabulate[|l|l|]
%D \HL
%D \NC year     \NC (\currentdate[year])     \NC\NR
%D \NC yy       \NC (\currentdate[yy])       \NC\NR
%D \NC y        \NC (\currentdate[y])        \NC\NR
%D \NC Y        \NC (\currentdate[Y])        \NC\NR
%D \HL
%D \NC month    \NC (\currentdate[month])    \NC\NR
%D \NC mm       \NC (\currentdate[mm])       \NC\NR
%D \NC m        \NC (\currentdate[m])        \NC\NR
%D \NC M        \NC (\currentdate[M])        \NC\NR
%D \HL
%D \NC day      \NC (\currentdate[day])      \NC\NR
%D \NC dd       \NC (\currentdate[dd])       \NC\NR
%D \NC d        \NC (\currentdate[d])        \NC\NR
%D \NC D        \NC (\currentdate[D])        \NC\NR
%D \HL
%D \NC weekday  \NC (\currentdate[weekday])  \NC\NR
%D \NC w        \NC (\currentdate[w])        \NC\NR
%D \NC W        \NC (\currentdate[W])        \NC\NR
%D \HL
%D \NC referral \NC (\currentdate[referral]) \NC\NR
%D \HL
%D \NC day:mnem \NC (\currentdate[day:mnem]) \NC\NR
%D \NC dd:mnem  \NC (\currentdate[dd:mnem])  \NC\NR
%D \NC d:mnem   \NC (\currentdate[d:mnem])   \NC\NR
%D \NC D:mnem   \NC (\currentdate[D:mnem])   \NC\NR
%D \HL
%D \stoptabulate
%D
%D \startbuffer
%D (\currentdate[D,.,M,.,Y])
%D (\currentdate[day,month,year])
%D (\currentdate[day,+,month,+,year])
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D
%D Some indirectness and abstraction:
%D
%D \starttyping
%D \definedate[crap][year]
%D \currentdate[crap]
%D \stoptyping

\installcorenamespace{date}

\permanent\tolerant\protected\def\definedate[#1]#,[#2]%
  {\ifarguments\else\defcsname\??date#1\endcsname{#2}\fi}

\def\syst_converters_check_date_specification#1%
  {\ifcsname\??date#1\endcsname
     \edef#1{\lastnamedcs}%
   \fi}

\newtoks\everycurrentdate

\lettonothing\m_syst_converters_date

\permanent\tolerant\protected\def\currentdate[#1]%
  {\dontleavehmode
   \begingroup
   \expand\everycurrentdate
   \edef\m_syst_converters_date{#1}%
   \syst_converters_check_date_specification\m_syst_converters_date
   \syst_converters_check_date_specification\currentdatespecification
   \clf_currentdate
     {\m_syst_converters_date}{\currentdatespecification}{\labellanguage}%
     \normalyear\normalmonth\normalday
   \endgroup}

\permanent\tolerant\protected\def\setdate[#1]% sets the date !
  {\begingroup
   \letdummyparameter\c!d\normalday
   \letdummyparameter\c!m\normalmonth
   \letdummyparameter\c!y\normalyear
   \getdummyparameters[#1]%
   \expanded
     {\endgroup
      \ifchknumber\directdummyparameter\c!d\or\normalday  \the\lastchknumber\relax\fi
      \ifchknumber\directdummyparameter\c!m\or\normalmonth\the\lastchknumber\relax\fi
      \ifchknumber\directdummyparameter\c!y\or\normalyear \the\lastchknumber\relax\fi}}

\permanent\tolerant\protected\def\date[#1]#,[#2]% sets the date !
  {\dontleavehmode
   \begingroup
   \ifhastok={#1}%
     \setdate[#1]% sets the date !
     \edef\m_syst_converters_date{#2}%
   \orelse\ifhastok={#2}%
     \setdate[#2]% sets the date !
     \edef\m_syst_converters_date{#1}%
   \else
     \edef\m_syst_converters_date{#1}%
   \fi
   \expand\everycurrentdate
%    \edef\m_syst_converters_date{#2}%
   \syst_converters_check_date_specification\m_syst_converters_date
   \syst_converters_check_date_specification\currentdatespecification
   \clf_currentdate
     {\m_syst_converters_date}{\currentdatespecification}{\labellanguage}%
     \normalyear\normalmonth\normalday
   \endgroup}

\permanent\def\rawdate[#1]% expandable and no labels
  {\clf_currentdate
     {#1}{\currentdatespecification}{}%
     \normalyear\normalmonth\normalday}

%D \macros
%D   {currenttime}
%D
%D The currenttime is actually the jobtime. You can specify a pattern similar
%D to the previous date macro using the keys \type {h}, \type {m} and a separator.

\mutable\let\currenthour  \!!plusone
\mutable\let\currentminute\!!plusone
\mutable\let\currentsecond\!!plusone

\permanent\protected\def\calculatecurrenttime
  {\edef\currenthour  {\clf_hour  }%
   \edef\currentminute{\clf_minute}%
   \edef\currentsecond{\clf_second}}

% \def\currenttimespecification{h,:,m}

\permanent\protected\def\currenttime
  {\doifelsenextoptional\syst_converters_current_time_yes\syst_converters_current_time_nop}

\protected\def\syst_converters_current_time_yes[#1]%
  {\calculatecurrenttime
   \processallactionsinset[#1][h=>\currenthour,m=>\currentminute,\s!unknown=>\commalistelement]}

\protected\def\syst_converters_current_time_nop
  {\expanded{\syst_converters_current_time_yes[\currenttimespecification]}}

\pushoverloadmode

%D A (simple) time formatter:
%D
%D \starttyping
%D time         : \the\time
%D time current : \time[method=current] % hh:mm:ss
%D time start   : \time[method=start]   % hh:mm:ss   startup time
%D time here    : \time[method=here]    % hh:mm:ss   time since startup
%D time m       : \time[m=100]          % hh:mm
%D time s       : \time[s=3661]         % hh:mm:ss
%D \stoptyping

% We keep this as an example of \LMTX\ coding:
%
% \permanent\tolerant\protected\def\time[#1]%
%   {\ifarguments
%      \expandafter\normaltime
%    \else
%      \begingroup
%      \setdummyparameter\c!separator{:}%
%      \resetdummyparameter\c!method
%      \resetdummyparameter\c!h
%      \resetdummyparameter\c!m
%      \resetdummyparameter\c!s
%      \getdummyparameters[#1]%
%      \ifcstok{\dummyparameter\c!method}\v!current
%        \clf_time\zerocount\plusone
%      \orelse\iflastnamedcs\v!start
%        \clf_time\plusone\plusone
%      \orelse\iflastnamedcs\v!here
%        \clf_time\plustwo\plusone
%      \orelse\ifcstok{\dummyparameter\c!h\dummyparameter\c!m\dummyparameter\c!s}\emptytoks
%        \clf_time\zerocount\zerocount
%      \else
%        \scratchcounterone  \ifchknumexpr\directdummyparameter\c!h\or\lastchknumber\else\zerocount\fi
%        \scratchcountertwo  \ifchknumexpr\directdummyparameter\c!m\or\lastchknumber\else\zerocount\fi
%        \scratchcounterthree\ifchknumexpr\directdummyparameter\c!s\or\lastchknumber\else\minusone \fi
%        % we could this in lua too
%        \ifnum\scratchcounterthree>\zerocount
%          \advanceby\scratchcountertwo{\scratchcounterthree/\plussixty}%
%          \scratchcounterthree{\scratchcounterthree;\plussixty}%
%        \fi
%        \advanceby\scratchcounterone{\scratchcountertwo/\plussixty}%
%        \scratchcountertwo{\scratchcountertwo;\plussixty}%
%        \scratchcounterone{\scratchcounterone;\plustwentyfour}%
%        \twodigits\scratchcounterone
%        \dummyparameter\c!separator
%        \twodigits\scratchcountertwo
%        \ifnum\scratchcounterthree<\zerocount\else
%          \dummyparameter\c!separator
%          \twodigits\scratchcounterthree
%        \fi
%      \fi
%      \endgroup
%    \fi}

\permanent\tolerant\protected\def\time[#1]% per request on the mailing list
  {\ifarguments
     \expandafter\normaltime
   \else
     \begingroup
     \resetdummyparameter\c!method
     \resetdummyparameter\c!h
     \resetdummyparameter\c!m
     \resetdummyparameter\c!s
     \getdummyparameters[#1]%
     \clf_timestring
        {\directdummyparameter\c!method}%
        {\directdummyparameter\c!h}%
        {\directdummyparameter\c!m}%
        {\directdummyparameter\c!s}%
     \endgroup
   \fi}

\popoverloadmode

%D Because we're dealing with dates, we also introduce a few day loops:
%D
%D \starttyping
%D \processmonth{year}{month}{command}
%D \processyear{year}{command}{before}{after}
%D \stoptyping
%D
%D The counters \type {\normalyear}, \type {\normalmonth} and \type {\normalday}
%D can be used for for date manipulations.

\permanent\protected\def\processmonth#1#2#3% year month command
  {\begingroup
   \getdayspermonth{#1}{#2}%
   \dostepwiserecurse\plusone\numberofdays\plusone
     {\normalyear #1\relax
      \normalmonth#2\relax
      \normalday  \recurselevel\relax
      #3}%
   \endgroup}

\permanent\protected\def\processyear#1#2#3#4% year command before after
  {\begingroup
   \dorecurse\plustwelve
     {\normalyear #1\relax
      \normalmonth\recurselevel\relax
      #3\processmonth\normalyear\normalmonth{#2}#4}%
   \endgroup}

%D \macros
%D   {defineconversion, convertnumber}
%D
%D Conversion involves the macros that we implemented earlier in this module.
%D
%D \showsetup{defineconversion}
%D \showsetup{convertnumber}
%D
%D We can feed this command with conversion macros as well as a set of conversion
%D symbols. Both need a bit different treatment.
%D
%D \starttyping
%D \defineconversion [roman] [\romannumerals]
%D \defineconversion [set 1] [$\star$,$\bullet$,$\ast$]
%D \stoptyping
%D
%D You can define a language dependent conversion with:
%D
%D \starttyping
%D \defineconversion [en] [whatever] [\something]
%D \stoptyping

\installcorenamespace {conversion}
\installcorenamespace {conversionarguments}
\installcorenamespace {conversionwords}

%D It might be better to move more to \LUA\ as we also need conversion there and
%D duplicating logic doesn't make things cleaner. It means that all conversions
%D will get a language argument too. However, we permit definitions at the \TEX\ end
%D so we have to provide some hybrid method.

% checkedconversion(method,n,language)

\permanent\tolerant\protected\def\defineconversion[#1]#*[#2]#*[#3]% from now on global (maybe local again some day)
  {\ifparameter#3\or
     \syst_converters_define_conversion_indeed{#1#2}{#1:#2}{#3}%
   \else
     \syst_converters_define_conversion_indeed{#1}{#1}{#2}%
   \fi}

\def\syst_converters_define_conversion_indeed#1#2#3%
  {\doifelseinstring{,}{\detokenize{#3}}
     {\clf_defineconversion{#2}{\detokenize{#3}}% a set e.g. of symbols
      \gdefcsname\??conversion#1\endcsname{\syst_converters_checked_conversion{#2}}}
     {\gdefcsname\??conversion#1\endcsname{#3}}}

\def\syst_converters_checked_conversion#1#2%
  {\clf_checkedconversion{#1}{#2}}

%D If a conversion is just a font switch then we need to make sure that the number
%D is indeed ends up as number in the input, so we need to handle the second
%D argument.

\permanent\def\convertnumber#1#2% expandable
  {\csname\??conversionarguments
     \ifcsname\??conversion\currentlanguage#1\endcsname1\else
     \ifcsname\??conversion                #1\endcsname2\else
                                                       3\fi\fi
   \endcsname{#1}{\number#2}}

\permanent\protected\def\uconvertnumber % unexpandable
  {\convertnumber}

\defcsname\??conversionarguments1\endcsname#1{\csname\??conversion\currentlanguage#1\endcsname}
\defcsname\??conversionarguments2\endcsname#1{\csname\??conversion                #1\endcsname}
\letcsname\??conversionarguments3\endcsname  \syst_converters_checked_conversion

% we can also add a \ctxcommand{doifelseconversion("#1","\currentlanguage")} to check
% if we have definitions that are not matched at the lua end .. eventually we might do
% that when more shows up

\permanent\def\doifelseconversiondefined#1% expandable
  {\ifcsname\??conversion\currentlanguage#1\endcsname
     \expandafter\firstoftwoarguments
   \orelse\ifcsname\??conversion#1\endcsname
     \expandafter\firstoftwoarguments
   \else
     \expandafter\secondoftwoarguments
   \fi}

\permanent\def\doifelseconversionnumber#1#2% expandable
  {\ifnum#2>{\clf_nofconversions{#1}}%
     \expandafter\secondoftwoarguments
   \else
     \expandafter\firstoftwoarguments
   \fi}

\aliased\let\doifconversiondefinedelse\doifelseconversiondefined
\aliased\let\doifconversionnumberelse \doifelseconversionnumber

%D Handy.

\defcsname\??conversionwords\v!one  \endcsname{1}
\defcsname\??conversionwords\v!two  \endcsname{2}
\defcsname\??conversionwords\v!three\endcsname{3}
\defcsname\??conversionwords\v!four \endcsname{4}
\defcsname\??conversionwords\v!five \endcsname{5}

\permanent\def\wordtonumber#1#2{\ifcsname\??conversionwords#1\endcsname\lastnamedcs\else#2\fi}

% \defineconversion[ctx][c,o,n,t,e,x,t]
%
% \doloop{\doifelseconversionnumber{ctx}{\recurselevel}{[\recurselevel]}{\exitloop}}

%D \macros
%D   {ordinalnumber, highordinalstr, ordinalstr}
%D
%D Efficient general ordinal number converters are sometimes difficult to
%D implement. Fortunately dates never exceed the number~31.

\permanent\def\highordinalstr#1{\high{\notsmallcapped{#1}}}
\permanent\def\ordinalstr    #1{\notsmallcapped{#1}}
\permanent\def\ordinalnumber #1{\clf_ordinal{#1}{\currentlanguage}}
\permanent\def\Ordinalnumber #1{\Words{\clf_ordinal{#1}{\currentlanguage}}}

\mutable\let\verbosenumberconnector\space

\permanent\def\verbosenumber#1{\clf_verbose{#1}{\currentlanguage}{\verbosenumberconnector}}
\permanent\def\VerboseNumber#1{\Words{\clf_verbose{#1}{\currentlanguage}{\verbosenumberconnector}}}

%D As longs as symbols are linked to levels or numbers, we can also use the
%D conversion mechanism, but in for instance the itemization macros, we prefer
%D symbols because they can more easier be (partially) redefined. Symbols are
%D implemented in another module.

\permanent\def\smallcappedromannumerals#1{\smallcapped{\romannumerals{#1}}}
\permanent\def\smallcappedcharacters   #1{\smallcapped{\characters   {#1}}}

\defineconversion []                     [\numbers] % the default conversion
\defineconversion [\v!empty]             [\gobbleoneargument]
\defineconversion [\v!none]              [\numbers]
\defineconversion [\s!default]           [\numbers]

\defineconversion [month]                [\monthlong]
\defineconversion [month:mnem]           [\monthshort]

\defineconversion [\v!character]         [\character]
\defineconversion [\v!Character]         [\Character]

\defineconversion [\v!characters]        [\characters]
\defineconversion [\v!Characters]        [\Characters]

\defineconversion [a]                    [\alphabeticnumerals]
\defineconversion [A]                    [\Alphabeticnumerals]
\defineconversion [AK]                   [\smallcappedcharacters]
\defineconversion [KA]                   [\smallcappedcharacters]

\defineconversion [\v!alphabetic]        [\alphabeticnumerals]
\defineconversion [\v!Alphabetic]        [\Alphabeticnumerals]

\defineconversion [\v!number]            [\numbers]
\defineconversion [\v!numbers]           [\numbers]
\defineconversion [\v!Numbers]           [\Numbers]
\defineconversion [\v!mediaeval]         [\mediaeval]

\defineconversion [\v!word]              [\verbosenumber]
\defineconversion [\v!words]             [\verbosenumber]

\defineconversion [\v!Word]              [\VerboseNumber]
\defineconversion [\v!Words]             [\VerboseNumber]

\defineconversion[\v!ordinal]            [\ordinalnumber]
\defineconversion[\v!Ordinal]            [\Ordinalnumber]

\defineconversion [n]                    [\numbers]
\defineconversion [N]                    [\Numbers]
\defineconversion [m]                    [\mediaeval]
\defineconversion [o]                    [\oldstylenumerals]
\defineconversion [O]                    [\oldstylenumerals]
\defineconversion [or]                   [\oldstyleromannumerals]

\defineconversion [\v!romannumerals]     [\romannumerals]
\defineconversion [\v!Romannumerals]     [\Romannumerals]

\defineconversion [i]                    [\romannumerals]
\defineconversion [I]                    [\Romannumerals]
\defineconversion [r]                    [\romannumerals]
\defineconversion [R]                    [\Romannumerals]

\defineconversion [KR]                   [\smallcappedromannumerals]
\defineconversion [RK]                   [\smallcappedromannumerals]

\defineconversion [\v!greek]             [\greeknumerals]
\defineconversion [\v!Greek]             [\Greeknumerals]

\defineconversion [\s!math:\v!greek]     [\mathgreeknumerals]
\defineconversion [\s!math:\v!Greek]     [\mathGreeknumerals]

\defineconversion [g]                    [\greeknumerals]
\defineconversion [G]                    [\Greeknumerals]

%defineconversion [ñ]                    [\spanishnumerals]
%defineconversion [Ñ]                    [\Spanishnumerals]

\defineconversion [abjadnumerals]        [\abjadnumerals]
\defineconversion [abjadnodotnumerals]   [\abjadnodotnumerals]
\defineconversion [abjadnaivenumerals]   [\abjadnaivenumerals]

\defineconversion [hebrewnumerals]       [\hebrewnumerals]
\defineconversion [yiddishnumerals]      [\yiddishnumerals]

% users can do: \defineconversion [he] [\hebrewnumerals]
% users can do: \defineconversion [yi] [\hebrewnumerals]

\defineconversion [thainumerals]         [\thainumerals]
\defineconversion [devanagarinumerals]   [\devanagarinumerals]
\defineconversion [malayalamnumerals]    [\malayalamnumerals]
\defineconversion [tamilnumerals]        [\tamilnumerals]
\defineconversion [kannadanumerals]      [\kannadanumerals]
\defineconversion [telugunumerals]       [\telugunumerals]
\defineconversion [bengalinumerals]      [\bengalinumerals]
\defineconversion [gurmurkhinumerals]    [\gurmurkhinumerals]
\defineconversion [gujaratinumerals]     [\gujaratinumerals]
\defineconversion [tibetannumerals]      [\tibetannumerals]
\defineconversion [greeknumerals]        [\greeknumerals]
\defineconversion [Greeknumerals]        [\Greeknumerals]
\defineconversion [arabicnumerals]       [\arabicnumerals]
\defineconversion [persiannumerals]      [\persiannumerals]
\defineconversion [arabicexnumerals]     [\arabicexnumerals]
\defineconversion [arabicdecimals]       [\arabicdecimals]
\defineconversion [persiandecimals]      [\persiandecimals]

\defineconversion [mathgreeknumerals]    [\mathgreeknumerals]
\defineconversion [mathGreeknumerals]    [\mathGreeknumerals]

\defineconversion [koreannumerals]       [\koreannumerals]
\defineconversion [koreanparennumerals]  [\koreanparenthesisnumerals] % for old times sake (for a while)
\defineconversion [koreanparenthesisnumerals]
                                         [\koreanparenthesisnumerals]
\defineconversion [koreancirclenumerals] [\koreancirclenumerals]

\defineconversion [kr]                   [\koreannumerals]
\defineconversion [kr-p]                 [\koreanparentnumerals]
\defineconversion [kr-c]                 [\koreancirclenumerals]

\defineconversion [chinesenumerals]      [\chinesenumerals]
\defineconversion [chinesecapnumerals]   [\chinesecapnumerals]
\defineconversion [chineseallnumerals]   [\chineseallnumerals]
\defineconversion [chinesedatenumerals]  [\chinesedatenumerals]

\defineconversion [cn]                   [\chinesenumerals]
\defineconversion [cn-c]                 [\chinesecapnumerals]
\defineconversion [cn-a]                 [\chineseallnumerals]
\defineconversion [cn-d]                 [\chinesedatenumerals]

%D Moved from lang-def.mkiv:
%D
%D Define these as the general character enumeration when language is Slovenian. If
%D you feel uncomfortable with this, mail Mojca, since she promised to to take the
%D heat. Pablo was next to request this. We changed characters to numerals for this
%D feature. We do need these definitions for mechanisms like itemize that check
%D for converters.

\permanent\def\sloveniannumerals#1{\clf_alphabetic{#1}{sl}}
\permanent\def\slovenianNumerals#1{\clf_Alphabetic{#1}{sl}}

\permanent\def\spanishnumerals  #1{\clf_alphabetic{#1}{es}}
\permanent\def\spanishNumerals  #1{\clf_Alphabetic{#1}{es}}

\permanent\def\russiannumerals  #1{\clf_alphabetic{#1}{ru}}
\permanent\def\russianNumerals  #1{\clf_Alphabetic{#1}{ru}}

%defineconversion [\s!sl] [character]  [\sloveniannumerals]
%defineconversion [\s!sl] [Character]  [\slovenianNumerals]
%defineconversion [\s!sl] [characters] [\sloveniannumerals]
%defineconversion [\s!sl] [Characters] [\slovenianNumerals]

\defineconversion [\s!sl] [alphabetic] [\sloveniannumerals]
\defineconversion [\s!sl] [Alphabetic] [\slovenianNumerals]

\defineconversion [\s!sl] [a]          [\sloveniannumerals]
\defineconversion [\s!sl] [A]          [\slovenianNumerals]
\defineconversion [\s!sl] [AK]         [\smallcapped\sloveniannumerals]
\defineconversion [\s!sl] [KA]         [\smallcapped\sloveniannumerals]

%defineconversion [\s!es] [character]  [\spanishnumerals]
%defineconversion [\s!es] [Character]  [\spanishNumerals]
%defineconversion [\s!es] [characters] [\spanishnumerals]
%defineconversion [\s!es] [Characters] [\spanishNumerals]

\defineconversion [\s!es] [alphabetic] [\spanishnumerals]
\defineconversion [\s!es] [Alphabetic] [\spanishNumerals]

\defineconversion [\s!es] [a]          [\spanishnumerals]
\defineconversion [\s!es] [A]          [\spanishNumerals]
\defineconversion [\s!es] [AK]         [\smallcapped\spanishnumerals]
\defineconversion [\s!es] [KA]         [\smallcapped\spanishnumerals]

%defineconversion [\s!ru] [character]  [\russiannumerals]
%defineconversion [\s!ru] [Character]  [\russianNumerals]
%defineconversion [\s!ru] [characters] [\russiannumerals]
%defineconversion [\s!ru] [Characters] [\russianNumerals]

\defineconversion [\s!ru] [alphabetic] [\russiannumerals]
\defineconversion [\s!ru] [Alphabetic] [\russianNumerals]

\defineconversion [\s!ru] [a]          [\russiannumerals]
\defineconversion [\s!ru] [A]          [\russianNumerals]
\defineconversion [\s!ru] [AK]         [\smallcapped\russiannumerals]
\defineconversion [\s!ru] [KA]         [\smallcapped\russiannumerals]

\defineconversion [sloveniannumerals]  [\sloveniannumerals]
\defineconversion [slovenianNumerals]  [\slovenianNumerals]

\defineconversion [spanishnumerals]    [\spanishnumerals]
\defineconversion [spanishNumerals]    [\spanishNumerals]

\defineconversion [russiannumerals]    [\russiannumerals]
\defineconversion [russianNumerals]    [\russianNumerals]

%D In case a font has no greek (WS):

\defineconversion [mathgreek]
  [\m{α},\m{β},\m{γ},\m{δ},\m{ε},\m{ζ},
   \m{η},\m{θ},\m{ι},\m{κ},\m{λ},\m{μ},
   \m{ν},\m{ξ},\m{ο},\m{π},\m{ρ},\m{σ},
   \m{τ},\m{υ},\m{φ},\m{χ},\m{ψ},\m{ω}]

%D Handy too (expanded!):

\permanent\def\unihex#1{\clf_unihex{#1}}

%D Symbol sets:

\ifdefined\symbol \else \def\symbol[#1]{#1} \fi % todo

% \defineconversion
%   [set 0]
%   [{\symbol[bullet]},
%    {\symbol[dash]},
%    {\symbol[star]},
%    {\symbol[triangle]},
%    {\symbol[circle]},
%    {\symbol[medcircle]},
%    {\symbol[bigcircle]},
%    {\symbol[square]},
%    {\symbol[checkmark]}]

% \defineconversion
%   [set 1]
%   [\mathematics{\star},
%    \mathematics{\star\star},
%    \mathematics{\star\star\star},
%    \mathematics{\ddagger},
%    \mathematics{\ddagger\ddagger},
%    \mathematics{\ddagger\ddagger\ddagger},
%    \mathematics{\ast},
%    \mathematics{\ast\ast},
%    \mathematics{\ast\ast\ast}]
%
% \defineconversion
%   [set 2]
%   [\mathematics{\ast},
%    \mathematics{\dag},
%    \mathematics{\ddag},
%    \mathematics{\ast\ast},
%    \mathematics{\dag\dag},
%    \mathematics{\ddag\ddag},
%    \mathematics{\ast\ast\ast},
%    \mathematics{\dag\dag\dag},
%    \mathematics{\ddag\ddag\ddag},
%    \mathematics{\ast\ast\ast\ast},
%    \mathematics{\dag\dag\dag\dag},
%    \mathematics{\ddag\ddag\ddag\ddag}]
%
% \defineconversion
%   [set 3]
%   [\mathematics{\star},
%    \mathematics{\star\star},
%    \mathematics{\star\star\star},
%    \mathematics{\ddagger},
%    \mathematics{\ddagger\ddagger},
%    \mathematics{\ddagger\ddagger\ddagger},
%    \mathematics{\P},
%    \mathematics{\P\P},
%    \mathematics{\P\P\P},
%    \mathematics{\S},
%    \mathematics{\S\S},
%    \mathematics{\S\S\S},
%    \mathematics{\ast},
%    \mathematics{\ast\ast},
%    \mathematics{\ast\ast\ast}]

\defineconversion
  [set 0]
  [\symbol{bullet},
   \symbol{dash},
   \symbol{star},
   \symbol{triangle},
   \symbol{circle},
   \symbol{medcircle},
   \symbol{bigcircle},
   \symbol{square},
   \symbol{checkmark}]

\defineconversion
  [set 1x]
  [\textormathchars{⋆}]

\defineconversion
  [set 1]
  [\textormathchars{⋆},
   \textormathchars{⋆⋆},
   \textormathchars{⋆⋆⋆},
   \textormathchars{‡},
   \textormathchars{‡‡},
   \textormathchars{‡‡‡},
   \textormathchars{∗},
   \textormathchars{∗∗},
   \textormathchars{∗∗∗}]

\defineconversion
  [set 2]
  [\textormathchars{∗},
   \textormathchars{†},
   \textormathchars{‡},
   \textormathchars{∗∗},
   \textormathchars{††},
   \textormathchars{‡‡},
   \textormathchars{∗∗∗},
   \textormathchars{†††},
   \textormathchars{‡‡‡},
   \textormathchars{∗∗∗∗},
   \textormathchars{††††},
   \textormathchars{‡‡‡‡}]

\defineconversion
  [set 3]
  [\textormathchars{⋆},
   \textormathchars{⋆⋆},
   \textormathchars{⋆⋆⋆},
   \textormathchars{‡},
   \textormathchars{‡‡},
   \textormathchars{‡‡‡},
   \textormathchars{¶},
   \textormathchars{¶¶},
   \textormathchars{¶¶¶},
   \textormathchars{§},
   \textormathchars{§§},
   \textormathchars{§§§},
   \textormathchars{∗},
   \textormathchars{∗∗},
   \textormathchars{∗∗∗}]

%D Iteration of suggestion by WS on mailinglist 2010.12.22:
%D
%D \starttyping
%D \setupfloatsplitting[conversion=continued]
%D \stoptyping

\permanent\protected\def\continuednumber#1%
  {\labeltext{\ifcase#1\or\else\v!continued\fi}}

\defineconversion
  [\v!continued]
  [\continuednumber]

%D Taken from x-asciimath (see digits-001.tex for an example):

\mutable\lettonothing\spaceddigitsmethod    % alternative methods   : 1 default, 2 and 3 only when > 4
\mutable\lettonothing\spaceddigitssymbol    % extra splitter symbol : {,}
\mutable\lettonothing\spaceddigitsseparator % separator symbol      : {\tocharacter{"2008}}

\permanent\protected\def\spaceddigits#1%
  {\clf_spaceddigits
      method    {\spaceddigitsmethod}%
      symbol    {\spaceddigitssymbol}%
      separator {\spaceddigitsseparator}%
      data      {#1}%
   \relax}

%D For those who sart counting at zero:
%D
%D \starttyping
%D \defineconversionset [zero] [n,zero] [n]
%D
%D \setuphead [sectionconversionset=zero]
%D
%D \starttext
%D     \startchapter [title=Introduction]
%D         \startsection [title=First topic]  \stopsection
%D         \startsection [title=Second topic] \stopsection
%D     \stopchapter
%D \stoptext
%D \stoptyping

\permanent\def\zeronumberconversion#1{\tointeger{#1-\plusone}}

\defineconversion [zero] [\zeronumberconversion]

\protect \endinput