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%D \module
%D   [       file=strc-doc,
%D        version=2008.10.20,
%D          title=\CONTEXT\ Structure Macros,
%D       subtitle=Document Structure,
%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 / Document Structure}

\registerctxluafile{strc-doc}{1.001}

\unprotect

\def\c!xmlsetup{xmlsetup}

% We operate in a \type {@@ns} namespace. All data is passed through
% variables. Of course we can built another interface on top of this
% that accepts multiple arguments. We might change this approach and
% remove this layer but it was needed for the transition.

\installcorenamespace{structure}

\installdirectcommandhandler \??structure {structure} % unchecked, so we need to initialize used parameters

% \definesystemvariable{ns}
% \def\structureparameter#1{\csname\??ns#1\endcsname}
% \def\detokenizedstructureparameter#1{\detokenize\expandafter\expandafter\expandafter{\csname\??ns#1\endcsname}}

\setupstructure % not a user command so we might need to change the name
  [\c!number=,
   \c!level=,
   \c!name=,
   \c!title=,
   \c!bookmark=,
   \c!marking=,
   \c!list=,
   \c!label=,
   \c!coupling=,
   \c!ownnumber=,
   \c!sectionseparatorset=\s!default,
   \c!sectionconversionset=\s!default,
   \c!sectionstopper=,
   \c!sectionstarter=,
   \c!sectionsegments=,
   \c!sectionresetset=,
   \c!reference=,
   \c!backreference=,
   \c!expansion=\v!no,
   \c!xmlsetup=,
   \s!catcodes=,
   \c!saveinlist=\v!yes,
   \c!command=\showstructuredata]

% maybe flags for list, bm, mark

\def\structurereferenceprefixon {+}
\def\structurereferenceprefixoff{-}

\def\setstructurereferenceprefix
  {\ifx\currentstructurereferenceprefix\empty
     % nothing
   \else\ifx\currentstructurereferenceprefix\structurereferenceprefixon
     \setupglobalreferenceprefix[\currentstructurereference]%
   \else\ifx\currentstructurereferenceprefix\structurereferenceprefixoff
     \setupglobalreferenceprefix[]%
   \else
     \setupglobalreferenceprefix[\currentstructurereferenceprefix]%
   \fi\fi\fi
   \let\currentstructurereferenceprefix\referenceprefix}

% why xdef ?

\unexpanded\def\structurecomponent
  {\dodoubleempty\dostructurecomponent}

\def\dostructurecomponent[#1][#2]% #1=interfaced-settings, #2=optional user data (not yet supported)
  {\begingroup
   \setupstructure[#1]%
   \xdef\currentstructurename           {\structureparameter\c!name}%
   \xdef\currentstructurecoupling       {\structureparameter\c!coupling}%
   \xdef\currentstructureownnumber      {\structureparameter\c!ownnumber}% optional own number
   \xdef\currentstructurelevel          {\structureparameter\c!level}%
   \edef\currentstructureexpansion      {\structureparameter\c!expansion}%
   \xdef\currentstructurexmlsetup       {\structureparameter\c!xmlsetup}%
   \xdef\currentstructurecatcodes       {\structureparameter\s!catcodes}%
   \xdef\currentstructurelabel          {\structureparameter\c!label}%
   \xdef\currentstructurereference      {\structureparameter\c!reference}%
   \xdef\currentstructurereferenceprefix{\structureparameter\c!referenceprefix}%
   \xdef\currentstructurebackreference  {\structureparameter\c!backreference}%
   \xdef\currentstructureshownumber     {\structureparameter\c!number}%
   \xdef\currentstructuresaveinlist     {\structureparameter\c!saveinlist}%
   \xdef\currentstructureincrementnumber{\structureparameter\c!incrementnumber}%
   \ifx\currentstructureexpansion\s!xml
     \xmlstartraw
       \xdef\currentstructuretitle   {\structureparameter\c!title}%
       \xdef\currentstructurebookmark{\structureparameter\c!bookmark}%
       \xdef\currentstructuremarking {\structureparameter\c!marking}%
       \xdef\currentstructurelist    {\structureparameter\c!list}%
     \xmlstopraw
     \ifx\currentstructurelist\empty
       \globallet\currentstructurelist\currentstructuretitle
     \fi
     \globallet\currentstructurecoding\s!xml
   \else
     \ifx\currentstructureexpansion\v!yes
       \xdef\currentstructuretitle   {\structureparameter\c!title}%
       \xdef\currentstructurebookmark{\structureparameter\c!bookmark}%
       \xdef\currentstructuremarking {\structureparameter\c!marking}%
       \xdef\currentstructurelist    {\structureparameter\c!list}%
     \else
       \xdef\currentstructuretitle   {\detokenizedstructureparameter\c!title}%
       \xdef\currentstructurebookmark{\detokenizedstructureparameter\c!bookmark}%
       \xdef\currentstructuremarking {\detokenizedstructureparameter\c!marking}%
       \xdef\currentstructurelist    {\detokenizedstructureparameter\c!list}%
       \iflocation \ifx\currentstructurebookmark\empty
         \begingroup
         \simplifycommands
         \xdef\currentstructurebookmark{\detokenize\expandafter{\normalexpanded{\structureparameter\c!title}}}%
        \endgroup
       \fi \fi
     \fi
     \ifx\currentstructurelist\empty
       \globallet\currentstructurelist\currentstructuretitle
     \fi
     \globallet\currentstructurecoding\s!tex
   \fi
   \setnextinternalreference
   \setstructurereferenceprefix
   \xdef\currentstructurenumber{\ctxlua{ % todo: combine with next call, adapt marks accordingly
        structures.sections.somelevel {
            references = {
                internal        = \nextinternalreference,
                block           = "\currentsectionblock",
                reference       = "\currentstructurereference",
                referenceprefix = "\currentstructurereferenceprefix",
                backreference   = "\currentstructurebackreference",
            },
            directives = {
                resetset   = "\structureparameter\c!sectionresetset",
            },
            metadata = {
                kind      = "section",
                name      = "\currentstructurename",
                catcodes  = \the\ifx\currentstructurecatcodes\empty\catcodetable\else\csname\currentstructurecatcodes\endcsname\fi,
                coding    = "\currentstructurecoding",
            \ifx\currentstructurecoding\s!xml
                xmlroot   =  "\xmldocument",
            \fi
            \ifx\currentstructurexmlsetup\empty \else
                xmlsetup  = "\currentstructurexmlsetup",
            \fi
            \ifx\currentstructuresaveinlist\v!no
                nolist    = true,
            \fi
            \ifx\currentstructureincrementnumber\v!yes
                increment = "\currentstructureincrementnumber",
            \fi
            },
            titledata = { % we can add mark and reference
                label    = \!!bs\detokenize\expandafter{\currentstructurelabel    }\!!es,
                title    = \!!bs\detokenize\expandafter{\currentstructuretitle    }\!!es,
            \ifx\currentstructurebookmark\currentstructuretitle \else
                bookmark = \!!bs\detokenize\expandafter{\currentstructurebookmark }\!!es,
            \fi
            \ifx\currentstructuremarking\currentstructuretitle \else
                marking  = \!!bs\detokenize\expandafter{\currentstructuremarking  }\!!es,
            \fi
            \ifx\currentstructuresaveinlist\v!no \else
              \ifx\currentstructurelist\currentstructuretitle \else
                list     = \!!bs\detokenize\expandafter{\currentstructurelist}\!!es,
              \fi
            \fi
            },
            numberdata = {
                % needed ?
                block         = "\currentsectionblock",
                hidenumber    = \ifx\currentstructureshownumber\v!no true\else nil\fi, % titles
                % so far
                separatorset  = "\structureparameter\c!sectionseparatorset",
                conversion    = "\structureparameter\c!sectionconversion", % for good old times sake
                conversionset = "\structureparameter\c!sectionconversionset",
                starter       = \!!bs\structureparameter\c!sectionstarter\!!es,
                stopper       = \!!bs\structureparameter\c!sectionstopper\!!es,
                set           = "\structureparameter\c!sectionset",
                segments      = "\structureparameter\c!sectionsegments",
                ownnumber     = "\currentstructureownnumber",
            },
            userdata = \!!bs\detokenize{#2}\!!es % will be converted to table at the lua end
        }
    }}%
   \xdef\currentstructurelistnumber{\ctxcommand{addtolist(structures.sections.current())}}%
   % \currentstructuresynchronize has to be called someplace, since it introduces a node
   \setstructuresynchronization\currentstructurelistnumber
   \structureparameter\c!command
   \endgroup}

\let\currentstructurenumber     \!!zerocount
\let\currentsectioncountervalue \!!zerocount % redefined later
\let\previoussectioncountervalue\!!zerocount % redefined later

% todo: a direct flusher (needed when hidden)

\def\setstructuresynchronization#1% todo: use ctxcontext
  {\xdef\currentstructureattribute  {\ctxlua        {tex.write(structures.references.setinternalreference("\currentstructurereferenceprefix","\currentstructurereference",\nextinternalreference,"\interactionparameter\c!focus"))}}%
   \xdef\currentstructuresynchronize{\ctxlatecommand{enhancelist(#1)}}}

\def\reportcurrentstructure{\ctxlua{structures.sections.reportstructure()}}

% Beware: we need to flush the data to the list explicitly. This is because
% node in inserted and we may want control over when that happens.

\def\showstructuredata
  {\par
   \dontleavehmode\begingroup
   \currentstructuresynchronize
   \currentstructureattribute
   [\currentstructurename: \showstructurelevel: \currentstructuretitle]
   \endgroup\par}

% We can access the (stored) data with the following macros.
%
% \def\MyHeadCommand  #1#2{\framed{#1}\framed{#2 / \structureuservariable{subtitle}}}
% \def\MyListCommand#1#2#3{\externalfigure[\structurelistuservariable{figure}][height=5mm]#2}
%
% \setuphead[chapter][command=\MyHeadCommand]
% \setuplist[chapter][alternative=command,command=\MyListCommand]
%
% \starttext
%     \setupheadertexts[chapter]
%     \setupinteraction[state=start]
%     \placebookmarks[chapter]
%     \placelist[chapter]
%     \startchapter[ownnumber=10,title=Ton,list=Hans,marking=Kees,bookmark=Bram][figure=cow.pdf,subtitle=oeps]
%     \stopchapter
% \stoptext

% todo: #1 => "#1" ... adapt lua code for name and number

\def\structurenumber               {\ctxcommand{structurenumber()}}
\def\structuretitle                {\ctxcommand{structuretitle()}}
\def\structurevariable           #1{\ctxcommand{structurevariable("#1")}}
\def\structureuservariable       #1{\ctxcommand{structureuservariable("#1")}}
\def\structurecatcodedget        #1{\ctxcommand{structurecatcodedget("#1")}} % bad name
\def\structuregivencatcodedget #1#2{\ctxcommand{structuregivencatcodedget("#1",\number#2)}} % bad name
\def\structureautocatcodedget  #1#2{\ctxcommand{structureautocatcodedget ("#1","#2")}}

\def\namedstructurevariable    #1#2{\ctxcommand{namedstructurevariable    ("#1","#2")}}
\def\namedstructureuservariable#1#2{\ctxcommand{namedstructureuservariable("#1","#2")}}

\protect \endinput