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

\registerctxluafile{strc-blk}{1.001}

\unprotect

% we run on top of buffers and sections
%
% todo: prefix numbers (needs further integration elsewhere)
%       check functionality
%       alternative files (needs further integration elsewhere)

\def\blockparameter#1#2{\ifcsname\??tb#1#2\endcsname\csname\??tb#1#2\endcsname\fi}

\unexpanded\def\setupblockparameters{\dodoubleargument       \dosetupblock} % fast one (for compatibility)
\unexpanded\def\setupblock          {\dodoubleargumentwithset\dosetupblock} % handles set

\def\dosetupblock[#1]{\getparameters[\??tb#1]} % [#1][#2]}

\unexpanded\def\defineblock[#1]%
  {\processcommalist[#1]\dodefineblock}

\def\dodefineblock#1%
  {\getparameters
     [\??tb#1]
     [\c!before=\blank,
      \c!after=\blank,
      \c!inner=,
      \c!style=,
      \c!file=]% todo
   \ctxlua{structure.blocks.define("#1")}%
   \setvalue{\e!begin#1}{\dodoubleempty\dobeginofblock[#1]}%
   \letvalue{\e!end#1}\relax}

\long\def\dobeginofblock[#1][#2]%
  {\normalexpanded{\noexpand\dodowithbuffer{@block@}{\e!begin#1}{\e!end#1}}
     {}{\ctxlua{structure.blocks.save("#1","#2","@block@")}}}% before after

\def\dostarthiddenblock
  {\startnointerference
   \dostartnormalblock}

\def\dostophiddenblock
  {\dostopnormalblock
   \stopnointerference}

% order matters: \c!before (think of: \c!before=\startitemize)

% no \endgroups

\let\doblocksetups\gobbleoneargument

\def\dostartnormalblock#1% name
  {\bgroup
   \visibletrue
   \edef\currentblock{#1}%
   \doblocksetups\currentblock
   \let\doblocksetups\gobbleoneargument
   \blockparameter\currentblock\c!before
   \dosetfontattribute{\??tb\currentblock}\c!style
   \dosetcolorattribute{\??tb\currentblock}\c!color
   \blockparameter\currentblock\c!inner
   \ignorespaces}

\def\dostopnormalblock
  {\removeunwantedspaces
   \blockparameter\currentblock\c!after
   \par % todo: alternative = text, paragraph
   \egroup}

\def\dosetblockstate[#1][#2][#3]% state name tag
  {\ctxlua{structure.blocks.setstate("#1","#2","#3")}}

\def\doselectblocks[#1][#2][#3][#4]% state name tag setups
  {\bgroup
   \doifassignmentelse{#3}
     {\getparameters[\??tb\??tb][\c!criterium=\v!text,#3]%
      \def\doblocksetups##1{\getparameters[\??tb##1][#3]}%
      \ctxlua{structure.blocks.select("#1","#2","","\@@tb@@tbcriterium")}}
     {\getparameters[\??tb\??tb][\c!criterium=\v!text,#4]%
      \def\doblocksetups##1{\getparameters[\??tb##1][#4]}%
      \ctxlua{structure.blocks.select("#1","#2","#3","\@@tb@@tbcriterium")}}%
   \egroup}

% hide: save, if [+] also hidden execute
% keep: save and normal execute

\def\hideblocks{\dotripleempty\dosetblockstate[hide]}
\def\keepblocks{\dotripleempty\dosetblockstate[keep]}

% use    : normal execute unless [-]
% process: hidden execute unless [-]
% select : idem use

\def\useblocks    {\doquadrupleempty\doselectblocks[use]}
\def\processblocks{\doquadrupleempty\doselectblocks[process]}
\def\selectblocks {\doquadrupleempty\doselectblocks[use]}

\protect \endinput