%D \module
%D   [       file=strc-num,
%D        version=2008.10.20,
%D          title=\CONTEXT\ Structure Macros,
%D       subtitle=Basic Numbering,
%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 Structure Macros / Basic Numbering}

\registerctxluafile{strc-num}{1.001}

\unprotect

% work in progress
% to be checked: can we use the command handler code here?
% all settings will move to lua

\installcorenamespace{counter}

\installcommandhandler \??counter {counter} \??counter

\let\setupstructurecounting\setupcounter

\setupcounter
  [\c!way=\v!by\v!chapter,
%  \c!blockway=,
%  \c!prefixstarter=,
%  \c!prefixstopper=,
   \c!prefixconnector=.,
   \c!prefixsegments=\autostructureprefixsegments\rootcounterparameter,
   \c!start=\zerocount,
   \c!prefix=\v!yes,
   \c!state=\v!start]

\def\autostructureprefixsegments#1% todo: \c!prefixsegments=\v!auto
  {2:\thenamedheadlevel{\ctxcommand{way("#1\c!way")}}}

\appendtoks
    \resetcounterparameter\s!counter
\to \everypresetcounter

\appendtoks
    \ifx\currentcounterparent\empty
        \edef\p_start{\counterparameter\c!start}%
        \ctxcommand{definecounter {
           name    = "\currentcounter",
           start   = \ifx\p_start\empty0\else\number\p_start\fi,
           counter = "\counterparameter\s!counter",
           method  = "\counterparameter\c!method",
        }}%
        \letcounterparameter\s!name\currentcounter
    \else
        \letcounterparameter\s!name\currentcounterparent
    \fi
    \strc_counters_check_setup
\to \everydefinecounter

\appendtoks
    \ifx\currentcounter\empty \else
        \edef\p_start{\counterparameter\c!start}%
        \setexpandedcounterparameter\c!start{\ifx\p_start\empty0\else\number\p_start\fi}%
        \strc_counters_check_setup
    \fi
\to \everysetupcounter

% % % %

\def\strc_counters_way#1% slow, we need to store it at the tex end
  {\ctxcommand{way("\namedcounterparameter{#1}\c!way")}}

% \def\thenamedcounterlevel#1%
%   {\thenamedheadlevel{\strc_counters_way{#1}}}

\def\thenamedcounterlevel#1%
  {\xthenamedheadlevel{\strc_counters_way{#1}}}

% \def\strc_counters_check_setup#1% does it have to happen here?
%   {% this can be done at the lua end / a bit messy here ... todo ...
%    \ifcsname\??counter#1\c!number\endcsname
%         \doifelsevalue   {\??counter#1\c!number}{#1} {\letbeundefined{\??counter#1\c!number}}%
%        {\doifvaluenothing{\??counter#1\c!number}     {\letbeundefined{\??counter#1\c!number}}}%
%    \fi
%    \ifcsname\??counter#1\c!number\endcsname
%      % it's a clone
%    \else
%      \edef\currentcounterlevel{\thenamedcounterlevel{#1}}%
%      \edef\p_start{\counterparameter{#1}\c!start}%
%      \ctxcommand{checkcountersetup("#1",\currentcounterlevel,\ifx\p_start\empty0\else\number\p_start\fi,"\counterparameter{#1}\c!state")}%
%    \fi}

\def\strc_counters_check_setup
  {\edef\p_name{\directcounterparameter\s!name}%
   \ifx\currentcounter\p_name
     \edef\currentcounterlevel{\thenamedcounterlevel\currentcounter}%
     \edef\p_start{\counterparameter\c!start}%
     \ctxcommand{checkcountersetup("\currentcounter",\currentcounterlevel,\ifx\p_start\empty0\else\number\p_start\fi,"\counterparameter\c!state")}%
   \fi}

\unexpanded\def\doifcounterelse #1{\ctxcommand{doifelsecounter("\namedcounterparameter{#1}\s!name")}}
\unexpanded\def\doifcounter     #1{\ctxcommand{doifcounter    ("\namedcounterparameter{#1}\s!name")}}
\unexpanded\def\doifnotcounter  #1{\ctxcommand{doifnotcounter ("\namedcounterparameter{#1}\s!name")}}

\unexpanded\def\setcounter        {\dotripleempty   \strc_counters_set_interfaced}
\unexpanded\def\setcounterown     {\dotripleempty   \strc_counters_setown_interfaced}
\unexpanded\def\restartcounter    {\dotripleempty   \strc_counters_restart_interfaced}
\unexpanded\def\resetcounter      {\dodoubleempty   \strc_counters_reset_interfaced}
\unexpanded\def\incrementcounter  {\dodoubleempty   \strc_counters_increment_interfaced}
\unexpanded\def\decrementcounter  {\dodoubleempty   \strc_counters_decrement_interfaced}

\unexpanded\def\rawcounter        {\dodoubleargument\strc_counters_raw_interfaced}
\unexpanded\def\lastcounter       {\dodoubleargument\strc_counters_last_interfaced}
\unexpanded\def\firstcounter      {\dodoubleargument\strc_counters_first_interfaced}
\unexpanded\def\nextcounter       {\dodoubleargument\strc_counters_next_interfaced}
\unexpanded\def\prevcounter       {\dodoubleargument\strc_counters_prev_interfaced}
\unexpanded\def\countersubs       {\dodoubleargument\strc_counters_subs_interfaced}

\unexpanded\def\savecounter       {\dodoubleempty   \strc_counters_save_interfaced}
\unexpanded\def\restorecounter    {\dodoubleempty   \strc_counters_restore_interfaced}

\def\strc_counters_set_interfaced
  {\ifthirdargument
     \singleexpandafter\strc_counters_set_two
   \else\ifsecondargument
     \doubleexpandafter\strc_counters_set_one
   \else
     \doubleexpandafter\gobblethreeoptionals
   \fi\fi}

\def\strc_counters_setown_interfaced
  {\ifthirdargument
     \singleexpandafter\strc_counters_setown_two
   \else\ifsecondargument
     \doubleexpandafter\strc_counters_setown_one
   \else
     \doubleexpandafter\gobblethreeoptionals
   \fi\fi}

\def\strc_counters_restart_interfaced
  {\ifthirdargument
     \singleexpandafter\strc_counters_restart_two
   \else\ifsecondargument
     \doubleexpandafter\strc_counters_restart_one
   \else
     \doubleexpandafter\gobblethreeoptionals
   \fi\fi}

\def\strc_counters_reset_interfaced
  {\ifsecondargument
     \singleexpandafter\strc_counters_reset_two
   \else\iffirstargument
     \doubleexpandafter\strc_counters_reset_one
   \else
     \doubleexpandafter\gobbletwooptionals
   \fi\fi}

\def\strc_counters_increment_interfaced
  {\ifsecondargument
     \singleexpandafter\strc_counters_increment_two
   \else\iffirstargument
     \doubleexpandafter\strc_counters_increment_one
   \else
     \doubleexpandafter\gobbletwooptionals
   \fi\fi}

\def\strc_counters_decrement_interfaced
  {\ifsecondargument
     \singleexpandafter\strc_counters_decrement_two
   \else\iffirstargument
     \doubleexpandafter\strc_counters_decrement_one
   \else
     \doubleexpandafter\gobbletwooptionals
   \fi\fi}

\def\strc_counters_raw_interfaced
  {\ifsecondargument
     \singleexpandafter\strc_counters_raw_two
   \else\iffirstargument
     \doubleexpandafter\strc_counters_raw_one
   \else
     \doubleexpandafter\gobbletwooptionals
   \fi\fi}

\def\strc_counters_last_interfaced
  {\ifsecondargument
     \singleexpandafter\strc_counters_last_two
   \else\iffirstargument
     \doubleexpandafter\strc_counters_last_one
   \else
     \doubleexpandafter\gobbletwooptionals
   \fi\fi}

\def\strc_counters_first_interfaced
  {\ifsecondargument
     \singleexpandafter\strc_counters_first_two
   \else\iffirstargument
     \doubleexpandafter\strc_counters_first_one
   \else
     \doubleexpandafter\gobbletwooptionals
   \fi\fi}

\def\strc_counters_prev_interfaced
  {\ifsecondargument
     \singleexpandafter\strc_counters_prev_two
   \else\iffirstargument
     \doubleexpandafter\strc_counters_prev_one
   \else
     \doubleexpandafter\gobbletwooptionals
   \fi\fi}

\def\strc_counters_next_interfaced
  {\ifsecondargument
     \singleexpandafter\strc_counters_next_two
   \else\iffirstargument
     \doubleexpandafter\strc_counters_next_one
   \else
     \doubleexpandafter\gobbletwooptionals
   \fi\fi}

\def\strc_counters_subs_interfaced
  {\ifsecondargument
     \singleexpandafter\strc_counters_subs_two
   \else\iffirstargument
     \doubleexpandafter\strc_counters_subs_one
   \else
     \doubleexpandafter\gobbletwooptionals
   \fi\fi}

\def\strc_counters_save_interfaced
  {\iffirstargument
     \expandafter\strc_counters_save_one
   \else
     \expandafter\gobbleoneoptional
   \fi}

\def\strc_counters_restore_interfaced
  {\iffirstargument
     \expandafter\strc_counters_restore_one
   \else
     \expandafter\gobbleoneoptional
   \fi}

\def\strc_counters_set_two           [#1][#2][#3]{\strc_counters_set_sub      {#1}{#2}{#3}}
\def\strc_counters_setown_two        [#1][#2][#3]{\strc_counters_setown_sub   {#1}{#2}{#3}}
\def\strc_counters_restart_two       [#1][#2][#3]{\strc_counters_restart_sub  {#1}{#2}{#3}}
\def\strc_counters_reset_two             [#1][#2]{\strc_counters_reset_sub    {#1}{#2}}
\def\strc_counters_increment_two         [#1][#2]{\strc_counters_increment_sub{#1}{#2}}
\def\strc_counters_decrement_two         [#1][#2]{\strc_counters_decrement_sub{#1}{#2}}

\def\strc_counters_raw_two               [#1][#2]{\strc_counters_raw_sub      {#1}{#2}}
\def\strc_counters_last_two              [#1][#2]{\strc_counters_last_sub     {#1}{#2}}
\def\strc_counters_first_two             [#1][#2]{\strc_counters_first_sub    {#1}{#2}}
\def\strc_counters_next_two              [#1][#2]{\strc_counters_next_sub     {#1}{#2}}
\def\strc_counters_prev_two              [#1][#2]{\strc_counters_prev_sub     {#1}{#2}}
\def\strc_counters_subs_two              [#1][#2]{\strc_counters_subs_sub     {#1}{#2}}

\def\strc_counters_set_one           [#1][#2][#3]{\strc_counters_set_sub      {#1}\plusone{#2}}
\def\strc_counters_setown_one        [#1][#2][#3]{\strc_counters_setown_sub   {#1}\plusone{#2}}
\def\strc_counters_restart_one       [#1][#2][#3]{\strc_counters_restart_sub  {#1}\plusone{#2}}
\def\strc_counters_reset_one             [#1][#2]{\strc_counters_reset_sub    {#1}\plusone}
\def\strc_counters_increment_one         [#1][#2]{\strc_counters_increment_sub{#1}\plusone}
\def\strc_counters_decrement_one         [#1][#2]{\strc_counters_decrement_sub{#1}\plusone}

\def\strc_counters_raw_one               [#1][#2]{\strc_counters_raw_sub      {#1}\plusone}
\def\strc_counters_last_one              [#1][#2]{\strc_counters_last_sub     {#1}\plusone}
\def\strc_counters_first_one             [#1][#2]{\strc_counters_first_sub    {#1}\plusone}
\def\strc_counters_next_one              [#1][#2]{\strc_counters_next_sub     {#1}\plusone}
\def\strc_counters_prev_one              [#1][#2]{\strc_counters_prev_sub     {#1}\plusone}
\def\strc_counters_subs_one              [#1][#2]{\strc_counters_subs_sub     {#1}\plusone}

\def\strc_counters_save_one                  [#1]{\strc_counters_save         {#1}}
\def\strc_counters_restore_one               [#1]{\strc_counters_restore      {#1}}

\unexpanded\def\strc_counters_set            #1#2{\strc_counters_set_sub      {#1}\plusone{#2}}
\unexpanded\def\strc_counters_setown         #1#2{\strc_counters_setown_sub   {#1}\plusone{#2}}
\unexpanded\def\strc_counters_restart        #1#2{\strc_counters_restart_sub  {#1}\plusone{#2}}
\unexpanded\def\strc_counters_reset            #1{\strc_counters_reset_sub    {#1}\plusone}
\unexpanded\def\strc_counters_increment        #1{\strc_counters_increment_sub{#1}\plusone}
\unexpanded\def\strc_counters_decrement        #1{\strc_counters_decrement_sub{#1}\plusone}

           \def\strc_counters_raw              #1{\strc_counters_raw_sub      {#1}\plusone}
           \def\strc_counters_last             #1{\strc_counters_last_sub     {#1}\plusone}
           \def\strc_counters_first            #1{\strc_counters_first_sub    {#1}\plusone}
           \def\strc_counters_next             #1{\strc_counters_next_sub     {#1}\plusone}
           \def\strc_counters_prev             #1{\strc_counters_prev_sub     {#1}\plusone}
           \def\strc_counters_subs             #1{\strc_counters_subs_sub     {#1}\plusone}

\unexpanded\def\strc_counters_set_sub      #1#2#3{\ctxcommand{setcounter    ("\namedcounterparameter{#1}\s!name",\number#2,\number#3)}}
\unexpanded\def\strc_counters_setown_sub   #1#2#3{\ctxcommand{setowncounter ("\namedcounterparameter{#1}\s!name",\number#2,"#3")}}
\unexpanded\def\strc_counters_restart_sub  #1#2#3{\ctxcommand{restartcounter("\namedcounterparameter{#1}\s!name",\number#2,\number#3)}}
\unexpanded\def\strc_counters_reset_sub      #1#2{\ctxcommand{resetcounter  ("\namedcounterparameter{#1}\s!name",\number#2)}}
\unexpanded\def\strc_counters_increment_sub  #1#2{\ctxcommand{addcounter    ("\namedcounterparameter{#1}\s!name",\number#2,1)}}
\unexpanded\def\strc_counters_decrement_sub  #1#2{\ctxcommand{addcounter    ("\namedcounterparameter{#1}\s!name",\number#2,-1)}}

           \def\strc_counters_raw_sub        #1#2{\ctxcommand{countervalue        ("\namedcounterparameter{#1}\s!name",\number#2)}} % maybe raw
           \def\strc_counters_last_sub       #1#2{\ctxcommand{lastcountervalue    ("\namedcounterparameter{#1}\s!name",\number#2)}}
           \def\strc_counters_first_sub      #1#2{\ctxcommand{firstcountervalue   ("\namedcounterparameter{#1}\s!name",\number#2)}}
           \def\strc_counters_next_sub       #1#2{\ctxcommand{nextcountervalue    ("\namedcounterparameter{#1}\s!name",\number#2)}}
           \def\strc_counters_prev_sub       #1#2{\ctxcommand{previouscountervalue("\namedcounterparameter{#1}\s!name",\number#2)}}
           \def\strc_counters_subs_sub       #1#2{\ctxcommand{subcountervalues    ("\namedcounterparameter{#1}\s!name",\number#2)}}

\unexpanded\def\strc_counters_save             #1{\ctxcommand{savecounter   ("\namedcounterparameter{#1}\s!name")}}
\unexpanded\def\strc_counters_restore          #1{\ctxcommand{restorecounter("\namedcounterparameter{#1}\s!name")}}

\unexpanded\def\strc_counters_incremented      #1{\ctxcommand{incrementedcounter("\namedcounterparameter{#1}\s!name",1, 1)}}
\unexpanded\def\strc_counters_decremented      #1{\ctxcommand{incrementedcounter("\namedcounterparameter{#1}\s!name",1,-1)}}

\unexpanded\def\showcounter                  [#1]{\ctxcommand{tracecounter("\namedcounterparameter{#1}\s!name")}}

\unexpanded\def\incrementedcounter           [#1]{\strc_counters_incremented{#1}} % expandable, no \dosingleargument
\unexpanded\def\decrementedcounter           [#1]{\strc_counters_decremented{#1}} % expandable, no \dosingleargument

% public variants ... beware, for old cases, from now on the value variants are the
% ones that are expandable

\def\rawcountervalue  [#1]{\strc_counters_raw_sub  {#1}\plusone}
\def\lastcountervalue [#1]{\strc_counters_last_sub {#1}\plusone}
\def\firstcountervalue[#1]{\strc_counters_first_sub{#1}\plusone}
\def\nextcountervalue [#1]{\strc_counters_next_sub {#1}\plusone}
\def\prevcountervalue [#1]{\strc_counters_prev_sub {#1}\plusone}

\let\rawsubcountervalue  \strc_counters_raw_two
\let\lastsubcountervalue \strc_counters_last_two
\let\firstsubcountervalue\strc_counters_first_two
\let\nextsubcountervalue \strc_counters_next_two
\let\prevsubcountervalue \strc_counters_prev_two

% The bypage check needs a multipass reference and therefore we only check for it when we increment
% and know that some content will be placed. We could also check for spreads.

\unexpanded\def\strc_counters_increment_sub#1#2%
  {% this will be combined into one lua call
   \edef\m_strc_counters_way{\strc_counters_way{#1}}%
   \ifx\m_strc_counters_way\v!page
     \checkpagechange{#1}%
     \ifpagechanged
       \strc_counters_reset{#1}%
     \fi
   \fi
   \ctxcommand{addcounter("\namedcounterparameter{#1}\s!name",\number#2,1)}}

\unexpanded\def\convertedcounter
  {\dodoubleempty\strc_counters_converted}

\def\strc_counters_converted[#1][#2]%
  {\begingroup
   \edef\currentcounter{#1}%
   \ifsecondargument\setupcurrentcounter[#2]\fi
   \ctxlua{structures.sections.prefixedconverted(
     "\counterparameter\s!name",
     {
       prefix        = "\counterparameter\c!prefix",
       separatorset  = "\counterparameter\c!prefixseparatorset",
       conversion    = "\counterparameter\c!prefixconversion",
       conversionset = "\counterparameter\c!prefixconversionset",
       starter       = \!!bs\counterparameter\c!prefixstarter\!!es,
       stopper       = \!!bs\counterparameter\c!prefixstopper\!!es,
       set           = "\counterparameter\c!prefixset",
       segments      = "\counterparameter\c!prefixsegments",
       connector     = \!!bs\counterparameter\c!prefixconnector\!!es,
     },
     {
       order         = "\counterparameter\c!numberorder",
       separatorset  = "\counterparameter\c!numberseparatorset",
       conversion    = \!!bs\counterparameter\c!numberconversion\!!es,
       conversionset = "\counterparameter\c!numberconversionset",
       starter       = \!!bs\counterparameter\c!numberstarter\!!es,
       stopper       = \!!bs\counterparameter\c!numberstopper\!!es,
       segments      = "\counterparameter\c!numbersegments",
       type          = "\counterparameter\c!type",
       criterium     = "\counterparameter\c!criterium", % might change if we also want this with sectioning
     }
   )}%
   \endgroup}

\def\directconvertedcounter#1#2% name, type
  {\ctxlua{structures.sections.prefixedconverted(
     "\namedcounterparameter{#1}\s!name",
     {
       prefix        = "\namedcounterparameter{#1}\c!prefix",
       separatorset  = "\namedcounterparameter{#1}\c!prefixseparatorset",
       conversion    = "\namedcounterparameter{#1}\c!prefixconversion",
       conversionset = "\namedcounterparameter{#1}\c!prefixconversionset",
    %  starter       = \!!bs\namedcounterparameter{#1}\c!prefixstarter\!!es,
    %  stopper       = \!!bs\namedcounterparameter{#1}\c!prefixstopper\!!es,
       set           = "\namedcounterparameter{#1}\c!prefixset",
       segments      = "\namedcounterparameter{#1}\c!prefixsegments",
       connector     = \!!bs\namedcounterparameter{#1}\c!prefixconnector\!!es,
     },
     {
       order         = "\namedcounterparameter{#1}\c!numberorder",
       separatorset  = "\namedcounterparameter{#1}\c!numberseparatorset",
       conversion    = \!!bs\namedcounterparameter{#1}\c!numberconversion\!!es,
       conversionset = "\namedcounterparameter{#1}\c!numberconversionset",
       starter       = \!!bs\namedcounterparameter{#1}\c!numberstarter\!!es,
       stopper       = \!!bs\namedcounterparameter{#1}\c!numberstopper\!!es,
       segments      = "\namedcounterparameter{#1}\c!numbersegments",
       type          = "#2",
     }
   )}}

\unexpanded\def\convertedsubcounter
  {\dotripleempty\strc_counters_converted_sub}

\def\strc_counters_converted_sub[#1][#2][#3]% #2 can be n or n:m
  {\ifsecondargument
     \strc_counters_converted[#1][\c!numbersegments=#2,#3]%
   \else
     \secondargumentfalse\strc_counters_converted[#1][]%
   \fi}

% \unexpanded\def\doifdefinedcounter#1%
%   {\ifcsname\namedcounterhash{#1}\s!name\endcsname
%      \expandafter\firstofoneargument
%    \else
%      \expandafter\gobbleoneargument
%    \fi}
%
% \unexpanded\def\doifundefinedcounter#1%
%   {\ifcsname\namedcounterhash{#1}\s!name\endcsname
%      \expandafter\gobbleoneargument
%    \else
%      \expandafter\firstofoneargument
%    \fi}
%
% \unexpanded\def\doifdefinedcounterelse#1%
%   {\ifcsname\namedcounterhash{#1}\s!name\endcsname
%      \expandafter\firstoftwoarguments
%    \else
%      \expandafter\secondoftwoarguments
%    \fi}

\unexpanded\def\doifdefinedcounter    {\doifcommandhandler    \??counter}
\unexpanded\def\doifundefinedcounter  {\doifnotcommandhandler \??counter}
\unexpanded\def\doifdefinedcounterelse{\doifelsecommandhandler\??counter}

%D What follows is a compatibility layer.

\let \numberparameter       \namedcounterparameter  % {name}\c!key

\let \definenumber          \definecounter          % [name]
\let \setupnumber           \setupcounter           % [name][setups]

\let \setnumber             \setcounter             % [name]{value}
\let \resetnumber           \resetcounter           % [name]
\let \savenumber            \savecounter            % [name]
\let \restorenumber         \restorecounter         % [name]
\let \incrementnumber       \incrementcounter       % [name]
\let \decrementnumber       \decrementcounter       % [name]
\let \rawnumber             \rawcounter             % [name]
\let \getnumber             \convertedcounter       % [name]
\let \convertednumber       \convertedcounter       % [name]

\let \doifdefinednumber     \doifdefinedcounter     % {number}{true}
\let \doifundefinednumber   \doifnotdefinedcounter  % {number}{true}
\let \doifdefinednumberelse \doifdefinedcounterelse % {number}{true}{false}

\let \setupnumbering        \setupcounter

%D Helpers:

% call:
%
% \strc_counters_register_component
%   \currentfloat
%   \getfloatparameters \floatparameter \detokenizedfloatparameter
%   \hascaption \hastitle \hasnumber
%   [settings][userdata]
%
% sets:
%
% \m_strc_counters_last_registered_index
% \m_strc_counters_last_registered_attribute
% \m_strc_counters_last_registered_synchronize

% currentstructurecomponent => \strc_current_ or just \m_strc_

\unexpanded\def\strc_counters_register_component#1#2#3#4#5#6#7[#8][#9]% maybe also nolist
  {\begingroup
   %
   #2[\s!haslevel=1,#8]%
   \edef\p_haslevel  {#3\s!haslevel}%
   \edef\p_hascaption{#3\s!hascaption}%
   \edef\p_hastitle  {#3\s!hastitle}%
   \edef\p_hasnumber {#3\s!hasnumber}%
   %
   \edef\p_prefixsegments{#3\c!prefixsegments}%
   \ifx\p_prefixsegments\v!auto
     \edef\p_prefixsegments{\autostructureprefixsegments#3}%
   \fi
   %
   \edef\currentname{#3\s!name}%
   \ifx\currentname\empty
     \edef\currentname{#1}%
   \fi
   \edef\currentcounter{#3\s!counter}%
   \ifx\currentcounter\empty
     \let\currentcounter\currentname
   \fi
   %
   \ifx\p_hascaption\v!yes
     \xdef\currentstructurecomponentname           {#3\s!name}%
     \xdef\currentstructurecomponentlevel          {#3\c!level}%
     \edef\currentstructurecomponentexpansion      {#3\c!expansion}%
     \xdef\currentstructurecomponentxmlsetup       {#3\c!xmlsetup}%
     \xdef\currentstructurecomponentcatcodes       {#3\s!catcodes}%
     \xdef\currentstructurecomponentlabel          {#3\c!label}%
     \xdef\currentstructurecomponentreference      {#3\c!reference}%
     \xdef\currentstructurecomponentreferenceprefix{#3\c!referenceprefix}%
     \ifx\currentstructurecomponentexpansion\s!xml
       \xmlstartraw
         \xdef\currentstructurecomponenttitle   {#3\c!title}%
         \xdef\currentstructurecomponentbookmark{#3\c!bookmark}%
         \xdef\currentstructurecomponentmarking {#3\c!marking}%
         \xdef\currentstructurecomponentlist    {#3\c!list}%
       \xmlstopraw
       \ifx\currentstructurecomponentlist\empty
         \globallet\currentstructurecomponentlist\currentstructurecomponenttitle
       \fi
       \globallet\currentstructurecomponentcoding\s!xml
     \else
       \ifx\currentstructurecomponentexpansion\v!yes
         \xdef\currentstructurecomponenttitle   {#3\c!title}%
         \xdef\currentstructurecomponentbookmark{#3\c!bookmark}%
         \xdef\currentstructurecomponentmarking {#3\c!marking}%
         \xdef\currentstructurecomponentlist    {#3\c!list}%
       \else
         \xdef\currentstructurecomponenttitle   {#4\c!title}%
         \xdef\currentstructurecomponentbookmark{#4\c!bookmark}%
         \xdef\currentstructurecomponentmarking {#4\c!marking}%
         \xdef\currentstructurecomponentlist    {#4\c!list}%
         \iflocation \ifx\currentstructurecomponentbookmark\empty
           \begingroup
           \simplifycommands
           \xdef\currentstructurecomponentbookmark{\detokenize\expandafter{\normalexpanded{#3\c!title}}}%
          \endgroup
         \fi \fi
       \fi
       \ifx\currentstructurecomponentlist\empty
         \globallet\currentstructurecomponentlist\currentstructurecomponenttitle
       \fi
       \globallet\currentstructurecomponentcoding\s!tex
     \fi
     %
     \setnextinternalreference
     \xdef\m_strc_counters_last_registered_index{\ctxcommand{addtolist{
        metadata = {
            kind     = "#1",
            name     = "\currentname",
            level    = structures.sections.currentlevel(),
            catcodes  = \the\ifx\currentstructurecomponentcatcodes\empty\catcodetable\else\csname\currentstructurecomponentcatcodes\endcsname\fi,
            coding    = "\currentstructurecomponentcoding",
        \ifx\currentstructurecomponentcoding\s!xml
            xmlroot   =  "\xmldocument",
        \fi
        \ifx\currentstructurecomponentxmlsetup\empty \else
            xmlsetup  = "\currentstructurexmlsetup",
        \fi
        },
        references = {
            internal        = \nextinternalreference,
            block           = "\currentsectionblock",
            reference       = "\currentstructurecomponentreference",
            referenceprefix = "\currentstructurecomponentreferenceprefix",
            section         = structures.sections.currentid(),
        },
        titledata = {
            label    = \!!bs\detokenize\expandafter{\currentstructurecomponentlabel    }\!!es,
            title    = \!!bs\detokenize\expandafter{\currentstructurecomponenttitle    }\!!es,
        \ifx\currentstructurecomponentbookmark\currentstructurecomponenttitle \else
            bookmark = \!!bs\detokenize\expandafter{\currentstructurecomponentbookmark }\!!es,
        \fi
        \ifx\currentstructurecomponentmarking\currentstructurecomponenttitle \else
            marking  = \!!bs\detokenize\expandafter{\currentstructurecomponentmarking  }\!!es,
        \fi
        \ifx\currentstructurecomponentlist\currentstructurecomponenttitle \else
          list     = \!!bs\detokenize\expandafter{\currentstructurecomponentlist}\!!es,
        \fi
        },
    \ifx\p_hasnumber\v!yes
        prefixdata = {
            prefix        = "#3\c!prefix",
            separatorset  = "#3\c!prefixseparatorset",
            conversion    = \!!bs#3\c!prefixconversion\!!es,
            conversionset = "#3\c!prefixconversionset",
            set           = "#3\c!prefixset",
        %   segments      = "#3\c!prefixsegments",
            segments      = "\p_prefixsegments",
            connector     = \!!bs#3\c!prefixconnector\!!es,
        },
        numberdata = { % more helpers here, like compact elsewhere
            numbers       = structures.counters.compact("\currentcounter",nil,true),
            group         = "#3\c!group",
            groupsuffix   = \!!bs#3\c!groupsuffix\!!es,
            counter       = "\currentcounter",
            separatorset  = "#3\c!numberseparatorset",
            conversion    = \!!bs#3\c!numberconversion\!!es,
            conversionset = "#3\c!numberconversionset",
            starter       = \!!bs#3\c!numberstarter\!!es,
            stopper       = \!!bs#3\c!numberstopper\!!es,
            segments      = "#3\c!numbersegments",
        },
    \fi
        userdata = \!!bs\detokenize{#9}\!!es % will be converted to table at the lua end
       }
     }}%
     \xdef\m_strc_counters_last_registered_attribute  {\ctxcommand    {setinternalreference(nil,nil,\nextinternalreference)}}%
     \xdef\m_strc_counters_last_registered_synchronize{\ctxlatecommand{enhancelist(\m_strc_counters_last_registered_index)}}%
   \else
     \glet\m_strc_counters_last_registered_index      \relax
     \glet\m_strc_counters_last_registered_attribute  \attributeunsetvalue
     \glet\m_strc_counters_last_registered_synchronize\relax
   \fi
   \endgroup}

\let\m_strc_counters_last_registered_index      \relax
\let\m_strc_counters_last_registered_attribute  \relax
\let\m_strc_counters_last_registered_synchronize\relax

% This can be improved as we don't need to pas all these variables
% each time (we can set them up once).

\unexpanded\def\strc_counter_preset_using_parameter#1#2% \setupcommand \someparameter
  {#1%
    [\c!way                =#2\c!way,
     \c!prefix             =#2\c!prefix,
     \c!prefixseparatorset =#2\c!prefixseparatorset,
     \c!prefixconversion   =#2\c!prefixconversion,
     \c!prefixconversionset=#2\c!prefixconversionset,
     \c!prefixstarter      =#2\c!prefixstarter,
     \c!prefixstopper      =#2\c!prefixstopper,
     \c!prefixsegments     =#2\c!prefixsegments,
     \c!prefixset          =#2\c!prefixset,
     \c!prefixconnector    =#2\c!prefixconnector,
     \c!numberseparatorset =#2\c!numberseparatorset,
     \c!numberconversion   =#2\c!numberconversion,
     \c!numberconversionset=#2\c!numberconversionset,
     \c!numberstarter      =#2\c!numberstarter,
     \c!numberstopper      =#2\c!numberstopper,
     \c!numbersegments     =#2\c!numbersegments]}

% \unexpanded\def\strc_counter_setup_using_parameter#1#2% name \someparameter
%   {\setupcounter
%      [#1]
%      [              \c!start=#2\c!start,
%                     \c!state=#2\c!state, % beware, "" == start
%                       \c!way=#2\c!way,
%                             %
%                    \c!prefix=#2\c!prefix,
%        \c!prefixseparatorset=#2\c!prefixseparatorset,
%          \c!prefixconversion=#2\c!prefixconversion,
%       \c!prefixconversionset=#2\c!prefixconversionset,
%             \c!prefixstarter=#2\c!prefixstarter,
%             \c!prefixstopper=#2\c!prefixstopper,
%                 \c!prefixset=#2\c!prefixset,
%            \c!prefixsegments=#2\c!prefixsegments,
%                 \c!prefixset=#2\c!prefixset,
%           \c!prefixconnector=#2\c!prefixconnector,
%                             %
%        \c!numberseparatorset=#2\c!numberseparatorset,
%          \c!numberconversion=#2\c!numberconversion,
%       \c!numberconversionset=#2\c!numberconversionset,
%             \c!numberstarter=#2\c!numberstarter,
%             \c!numberstopper=#2\c!numberstopper,
%            \c!numbersegments=#2\c!numbersegments]}

\unexpanded\def\strc_counter_setup_using_parameter#1#2% name \someparameter
  {\edef\currentcounter{#1}%
   %
   \setcounterparameter              \c!start{#2\c!start}%
   \setcounterparameter              \c!state{#2\c!state}% % beware, "" == start
   \setcounterparameter                \c!way{#2\c!way}%
   %
   \setcounterparameter             \c!prefix{#2\c!prefix}%
   \setcounterparameter \c!prefixseparatorset{#2\c!prefixseparatorset}%
   \setcounterparameter   \c!prefixconversion{#2\c!prefixconversion}%
   \setcounterparameter\c!prefixconversionset{#2\c!prefixconversionset}%
   \setcounterparameter      \c!prefixstarter{#2\c!prefixstarter}%
   \setcounterparameter      \c!prefixstopper{#2\c!prefixstopper}%
   \setcounterparameter          \c!prefixset{#2\c!prefixset}%
   \setcounterparameter     \c!prefixsegments{#2\c!prefixsegments}%
   \setcounterparameter          \c!prefixset{#2\c!prefixset}%
   \setcounterparameter    \c!prefixconnector{#2\c!prefixconnector}%
   %
   \setcounterparameter \c!numberseparatorset{#2\c!numberseparatorset}%
   \setcounterparameter   \c!numberconversion{#2\c!numberconversion}%
   \setcounterparameter\c!numberconversionset{#2\c!numberconversionset}%
   \setcounterparameter      \c!numberstarter{#2\c!numberstarter}%
   \setcounterparameter      \c!numberstopper{#2\c!numberstopper}%
   \setcounterparameter     \c!numbersegments{#2\c!numbersegments}%
   %
   \the\everysetupcounter}

\unexpanded\def\mult_interfaces_counter_association#1#2#3#4#5#6#7% tag current setup parameter list sync register
  {\strc_counter_preset_using_parameter#3\rootcounterparameter
   \newtoks#5%
   \unexpanded\def   #6{\ifx#2\empty\the#5\else\strc_counter_setup_using_parameter#2#4\fi}% sync
   \unexpanded\def#7##1{\normalexpanded{#5{\the#5\strc_counter_setup_using_parameter{##1}\noexpand#4}}}} % register

\unexpanded\def\installcounterassociation#1% => synchronize#1counters register#1counter
  {\normalexpanded
     {\mult_interfaces_counter_association
        {#1}% not \??xx but xx
        \expandafter\noexpand\csname current#1\endcsname
        \expandafter\noexpand\csname setup#1\endcsname
        \expandafter\noexpand\csname #1parameter\endcsname
        \expandafter\noexpand\csname counter_association_list_#1\endcsname
        \expandafter\noexpand\csname synchronize#1counters\endcsname
        \expandafter\noexpand\csname register#1counter\endcsname}}

% needs testing:
%
% \unexpanded\def\strc_counter_setup_push#1#2#3% \someparameter \directsomeparameter \setexpandedsomeparameter
%   {\let\savedcounterparameter           \counterparameter
%    \let\saveddirectcounterparameter     \directcounterparameter
%    \let\savedsetexpandedcounterparameter\setexpandedcounterparameter
%    % remap
%    \let\counterparameter                #1%
%    \let\directcounterparameter          #2%
%    \let\setexpandedcounterparameter     #3}
%
% \unexpanded\def\strc_counter_setup_pop
%   {\let\counterparameter                \savedcounterparameter
%    \let\directcounterparameter          \saveddirectcounterparameter
%    \let\setexpandedcounterparameter     \savedsetexpandedcounterparameter}
%
% \unexpanded\def\mult_interfaces_counter_association#1#2#3#4#5#6#7% tag current setup parameter list sync register
%   {\strc_counter_preset_using_parameter#3\rootcounterparameter
%    \newtoks#5%
%    \unexpanded\def#6% sync
%      {\strc_counter_setup_push
%       \ifx#2\empty
%         \the#5%
%       \else
%         \let\currentcounter\empty
%         \the\everysetupcounter
%       \fi
%       \strc_counter_setup_pop}%
%    \unexpanded\def#7##1% register
%       {\normalexpanded{#5{\the#5\edef\noexpand\currentcounter{##1}\noexpand\the\everysetupcounter}}}}

%D For good old times (easier to explain in manuals):
%D
%D \starttyping
%D \setcounter[userpage][9]
%D \setupcounter[userpage][number=9]
%D \setupuserpagenumber[number=9]
%D \stoptyping

% needs testing: we might have conflicts with mixins
%
% \appendtoks
%     \ifx\currentcounter\empty \else
%         \edef\p_number{\counterparameter\c!number}%
%         \ifx\p_number\empty \else
%             \strc_counters_set\currentcounter\p_number
%             \letcounterparameter\c!number\empty
%         \fi
%     \fi
% \to \everysetupcounter

\protect \endinput