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%D \module
%D [ file=strc-sbe,
%D version=2008.10.20,
%D title=\CONTEXT\ Structure Macros,
%D subtitle=Section Block Environments,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright=PRAGMA-ADE / Hans Hagen]
%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 / Section Block Environments}
\unprotect
% \def\ChapterEntry#1#2#3%
% {chapter : \hbox to \hsize{\strut\bf#2\hss#3}\endgraf\placelist[section]}
%
% \startfrontmatter % optional
% \placelist[chapter][alternative=command,command=\ChapterEntry,criterium=text] \page
% \stopfrontmatter % optional
%
% \startbodymatter % optional
% \chapter{first} \section{one} test \section{two} test \page
% \chapter{second} \section{alpha} test \section{beta} test \page
% \stopbodymatter % optional
\definesystemvariable {nb}
\def\v!structureblockenvironment{structureblockenvironment}
\unexpanded\def\definestructureblock{\dotripleargument\dodefinestructureblock}
\unexpanded\def\setupstructureblock {\dodoubleargument\dosetupstructureblock}
\def\setstructureblock {\dosingleargument\dosetstructureblock}
% \def\structureblockparameter#1{\executeifdefined{\??nb\currentstructureblock#1}\empty}
\def\structureblockparameter#1%
{\csname
\ifcsname\??nb\currentstructureblock#1\endcsname\??nb\currentstructureblock#1\else\s!empty\fi
\endcsname}
\newtoks \everybeforestructureblock
\newtoks \everyafterstructureblock
\def\dodefinestructureblock[#1][#2][#3]% singular plural settings
{\getparameters
[\??nb#1]
[\c!number=\v!yes,
\c!page=\v!right, % anders worden marks te vroeg gereset !
#3]%
\expandafter\newif\csname if#2\endcsname % better a mode
\setstructureblockenvironment{#1}\empty
\setvalue {\e!start#2}{\startstructureblock[#1]}%
\setvalue {\e!stop #2}{\stopstructureblock}}
\appendtoks
\doifsomething{\structureblockparameter\c!page}{\page[\structureblockparameter\c!page]}%
% TODO \resetsectionmarks\zerosection
\getstructureblockenvironment\currentstructureblock
\structureblockparameter\c!before % don't move
\dostarttagged\t!division\currentstructureblock
\to \everybeforestructureblock
\appendtoks
\structureblockparameter\c!after % don't move
\doifsomething{\structureblockparameter\c!page}{\page[\structureblockparameter\c!page]}%
\dostoptagged
% TODO \resetsectionmarks\zerosection
\to \everyafterstructureblock
\def\dosetupstructureblock[#1]%
{\getparameters[\??nb#1]}% [#2]
\def\dosetstructureblock[#1]% used to set the default
{\edef\currentstructureblock{\ctxlua{structures.sections.setblock("#1")}}}
\let\currentstructureblock\s!unknown
\unexpanded\def\startstructureblock[#1]%
{%\ctxlua{structures.counters.check(0)}% we assume sane usage of \page, as this is the only workable place (in push)
\begingroup
\edef\currentstructureblock{\ctxlua{structures.sections.pushblock("#1")}}%
\csname #1true\endcsname % for old times sake
\setsystemmode\currentstructureblock
\the\everybeforestructureblock\relax
\showmessage\m!structures1\currentstructureblock}
\unexpanded\def\stopstructureblock
{\showmessage\m!structures2\currentstructureblock
\the\everyafterstructureblock\relax
\edef\currentstructureblock{\ctxlua{structures.sections.popblock()}}%
\endgroup}
\long\def\setstructureblockenvironment#1#2%
{\long\setvalue{\??nb\s!do#1}{\do{#2}}}
\def\getstructureblockenvironment#1%
{\let\do\firstofoneargument
%\structureblockparameter{\s!do#1}}
\csname\??nb\s!do#1\endcsname}
%D \starttyping
%D \startsectionblockenvironment[frontpart]
%D \setuppagenumbering[conversion=romannumerals]
%D \stopsectionblockenvironment
%D
%D \startsectionblockenvironment[bodypart]
%D \setuppagenumber[number=1]
%D \stopsectionblockenvironment
%D
%D \startsectionblockenvironment[frontpart]
%D \setuppagenumbering[conversion=character]
%D \stopsectionblockenvironment
%D
%D \starttext
%D \startfrontmatter \chapter{test} \stopfrontmatter
%D \startbodymatter \chapter{test} \stopbodymatter
%D \startappendices \chapter{test} \stopappendices
%D \stoptext
%D \stoptyping
\setvalue{\e!start\v!structureblockenvironment}%
{\dosingleargument\dostartstructureblockenvironment}
\def\dostartstructureblockenvironment[#1]% evt \pushendofline \popendofline
{\long\def\do##1##2{\setstructureblockenvironment{#1}{##1##2}}%
%\grabuntil{\e!stop\v!structureblockenvironment}{\structureblockparameter{\s!do#1}}}
\grabuntil{\e!stop\v!structureblockenvironment}{\csname\??nb\s!do#1\endcsname}}
% this will become: (we ran in parallel for a while during transition)
\setvalue{\e!start\v!sectionblockenvironment}%
{\dosingleargument\dostartsectionblockenvironment}
\def\dostartsectionblockenvironment[#1]% evt \pushendofline \popendofline
{\long\def\do##1##2{\setstructureblockenvironment{#1}{##1##2}}%
%\grabuntil{\e!stop\v!sectionblockenvironment}{\structureblockparameter{\s!do#1}}}
\grabuntil{\e!stop\v!sectionblockenvironment}{\csname\??nb\s!do#1\endcsname}}
\protect \endinput
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