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%D \module
%D [ file=strc-lab, % was part of strc-des,
%D version=2008.10.20,
%D title=\CONTEXT\ Structure Macros,
%D subtitle=Labels,
%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 / Labels}
\unprotect
% todo: reset and increment will go
%D Labels are implemented somewhat inefficient but have the advantage that they
%D can be controlled like other constructions. Who knows when that comes in
%D handy?
\installcorenamespace{labels}
\installcommandhandler \??labels {label} \??labels % plural hash, else clash with label (or rename that one)
\installcounterassociation{label}
\let\setuplabels\setuplabel
\setuplabel
[\c!alternative=\v!intext,
\c!headstyle=\v!bold,
\c!titlestyle=\v!bold,
\c!distance=\zeropoint,
\c!width=\v!fit,
\c!titledistance=.5\emwidth,
\c!margin=\v!no,
\c!titleleft=(,
\c!titleright=),
\c!display=\v!no,
\c!titlecommand=,
\c!expansion=\v!no,
\c!way=\v!by\v!text,
\c!prefix=\v!no,
\c!prefixconnector=.,
\c!text=\currentlabel,
\c!number=\v!yes, % else description
\c!start=0,
\c!state=\v!start,
\c!levels=3]
\protected\def\strc_define_commands_label#1#2#3% current level parent
{\doifelsenothing{#3}
{\normalexpanded{\defineconstruction[#1][\s!handler=\v!label,\c!level=#2]}%
\edefcsname\??label#1:\s!parent\endcsname{\??label}}%
{\normalexpanded{\defineconstruction[#1][#3][\s!handler=\v!label,\c!level=#2]}%
\edefcsname\??label#1:\s!parent\endcsname{\??label#3}}%
\ifconditional\c_strc_constructions_define_commands
\frozen\instance\protected\edefcsname\e!next #1\endcsname{\strc_labels_next {#1}{\number#2}}% obsolete
\frozen\instance\protected\edefcsname\v!reset#1\endcsname{\strc_labels_reset{#1}{\number#2}}% obsolete % should be \e!reset anyway
%frozen\instance\setuevalue{\c!set #1}{\strc_labels_set {#1}{\number#2}}% obsolete
\ifcsname\v!current#1\endcsname
% we play safe
\else
\protected\edefcsname\v!current#1\endcsname{\strc_labels_current{#1}}% % obsolete % should be \e!current anyway
\fi
\frozen\instance\protected\edefcsname#1\endcsname{\strc_labels_command[#1]}%
\fi}
% todo: \strc_labels_command for user
\let\m_strc_labels_sub\empty
\appendtoks
\let\m_strc_labels_sub\empty
\ifempty\currentlabelparent
% clone => parent | subclone => clone | subsubclone => subclone
\strc_define_commands_label
{\m_strc_labels_sub\currentlabel}%
\plusone
\empty
\edef\p_levels{\labelparameter\c!levels}%
\dostepwiserecurse\plustwo\p_levels\plusone
{\strc_define_commands_label
{\v!sub\m_strc_labels_sub\currentlabel}%
\recurselevel
{\m_strc_labels_sub\currentlabel}%
\edef\m_strc_labels_sub{\v!sub\m_strc_labels_sub}}%
\else
% clone => parent | subclone => subparent | subsubclone => subsubparent
\edef\p_levels{\labelparameter\c!levels}%
\dorecurse\p_levels
{\strc_define_commands_label
{\m_strc_labels_sub\currentlabel}%
\recurselevel
{\m_strc_labels_sub\currentlabelparent}%
\edef\m_strc_labels_sub{\v!sub\m_strc_labels_sub}}%
\fi
\edef\p_counter{\labelparameter\s!counter}% can inherit from parent
\ifempty\p_counter %
\let\p_counter\currentlabel
\fi
\doifelsecounter\p_counter\donothing{\strc_labels_define_counter\p_counter}%
\letlabelparameter\s!counter\p_counter
\to \everydefinelabel
\let\p_strc_constructions_title \empty
\let\p_strc_constructions_number\empty
\newconditional\c_strc_constructions_number_keep
\setvalue{\??constructioninitializer\v!label}%
{\let \currentlabel \currentconstruction
\enforced\let\constructionparameter \labelparameter
\enforced\let\constructionnamespace \??label
\enforced\let\detokenizedconstructionparameter\detokenizedlabelparameter
\enforced\let\letconstructionparameter \letlabelparameter
\enforced\let\useconstructionstyleandcolor \uselabelstyleandcolor
\enforced\let\setupcurrentconstruction \setupcurrentlabel
% shared with enumerations
\edef\p_strc_constructions_number{\constructionparameter\c!number}%
\ifx\p_strc_constructions_number\v!yes
\settrue\c_strc_constructions_number_state
\iftrialtypesetting
\strc_counters_save\currentconstructionnumber
\fi
\ifconditional\c_strc_constructions_number_keep \else
\strc_counters_increment_sub\currentconstructionnumber\currentconstructionlevel
\fi
\else
\setfalse\c_strc_constructions_number_state
\fi
\edef\p_strc_constructions_title{\constructionparameter\c!title}%
\ifx\p_strc_constructions_title\v!yes
\settrue\c_strc_constructions_title_state
\else
\setfalse\c_strc_constructions_title_state
\fi}
\setvalue{\??constructionfinalizer\v!label}%
{\ifconditional\c_strc_constructions_number_state
\iftrialtypesetting
\strc_counters_restore\currentconstructionnumber
\fi
\fi}
%D Interfaces:
\protected\def\strc_labels_command{\setfalse\c_strc_constructions_number_keep\nameddescription}
\protected\def\strc_labels_current{\settrue \c_strc_constructions_number_keep\nameddescription}
\protected\def\strc_labels_next {\strc_constructions_next_indeed \namedlabelparameter} % #1#2
\protected\def\strc_labels_reset {\strc_constructions_reset_indeed\namedlabelparameter} % #1#2
%protected\def\strc_labels_set {\strc_constructions_set_indeed \namedlabelparameter} % #1#2
% similar to enumerations
\def\strc_labels_define_counter#1%
{\definecounter[#1]%
\registerlabelcounter{#1}}
\appendtoks
\synchronizelabelcounters
\to \everysetuplabel
\appendtoks
\synchronizelabelcounters
\to \everydefinelabel
% no start stop here
\letcsname\??constructionmainhandler\v!label\expandafter\endcsname\csname\??constructionmainhandler\v!description\endcsname
\protected\setevalue{\??constructioncommandhandler\v!label}%
{\csname\??constructionstarthandler\v!construction\endcsname
\csname\??constructionstophandler \v!construction\endcsname
\endgroup}
\protected\setvalue{\??constructiontexthandler\v!label}%
{\begingroup
\useconstructionstyleandcolor\c!headstyle\c!headcolor
\strc_labels_text
\endgroup}
\let\strc_labels_text\strc_enumerations_text
% inline variant
\defineconstructionalternative
[\v!intext]
[\c!renderingsetup=\??constructionrenderings:\v!intext]
\startsetups[\??constructionrenderings:\v!intext]
\dontleavehmode\box\constructionheadbox
\stopsetups
\protect \endinput
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