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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}
+
+\def\definestructureblock{\dotripleargument\dodefinestructureblock}
+\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
+\to \everybeforestructureblock
+
+\appendtoks
+    \structureblockparameter\c!after % don't move
+    \doifsomething{\structureblockparameter\c!page}{\page[\structureblockparameter\c!page]}%
+% TODO    \resetsectionmarks\zerosection
+\to \everyafterstructureblock
+
+\def\dosetupstructureblock[#1]%
+  {\getparameters[\??nb#1]}% [#2]
+
+\def\dosetstructureblock[#1]% used to set the default
+  {\edef\currentstructureblock{\ctxlua{structure.sections.setblock("#1")}}}
+
+\let\currentstructureblock\s!unknown
+
+\def\startstructureblock[#1]%
+  {\begingroup
+   \edef\currentstructureblock{\ctxlua{structure.sections.pushblock("#1")}}%
+   \csname #1true\endcsname % for old times sake
+   \setsystemmode\currentstructureblock
+   \the\everybeforestructureblock\relax
+   \showmessage\m!structures1\currentstructureblock}
+
+\def\stopstructureblock
+ {\showmessage\m!structures2\currentstructureblock
+  \the\everyafterstructureblock\relax
+  \edef\currentstructureblock{\ctxlua{structure.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