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%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 \& \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 / Blockmoves}
\registerctxluafile{strc-blk}{}
\unprotect
% we run on top of buffers and sections
%
% todo: prefix numbers (needs further integration elsewhere)
% check functionality
% alternative files (needs further integration elsewhere)
%
% order matters: \c!before (think of: \c!before=\startitemize)
%
% no \endgroups
\installcorenamespace {block}
\installcorenamespace {blocktemp}
\installcommandhandler \??block {block} \??block
\appendtoks
\clf_definestructureblock{\currentblock}%
\setuevalue{\e!begin\currentblock}{\strc_blocks_begin{\currentblock}}%
\letvalue {\e!end \currentblock}\donothing
\to \everydefineblock
% The naive way:
%
% \unexpanded\def\strc_blocks_begin#1%
% {\dotripleempty\strc_blocks_begin_indeed[#1]}
%
% \unexpanded\def\strc_blocks_begin_indeed[#1][#2][#3]%
% {\normalexpanded{\buff_pickup{\??block}{\e!begin#1}{\e!end#1}}
% {}%
% {\clf_savestructureblock{#1}{#2}{#3}{\??block}}%
% \plusone}%
%
% We need to prevent too much lookahead which will gobble newlines
% that are needed for buffers. See blocks-002.tex as example.
% maybe: systemmode "block:<name>"
\let\m_block \empty
\let\m_subblock\empty
\unexpanded\def\strc_blocks_begin#1%
{\edef\m_block {#1}%
\let \m_subblock\empty
\doifelsenextoptionalcs\strc_blocks_begin_yes\strc_blocks_begin_nop}
\unexpanded\def\strc_blocks_begin_yes[#1]%
{\doifelseassignmentcs{#1}%
\strc_blocks_begin_indeed
\strc_blocks_begin_tagged
{#1}}
\unexpanded\def\strc_blocks_begin_tagged#1%
{\edef\m_subblock{#1}%
\doifelsenextoptionalcs\strc_blocks_begin_yes_yes\strc_blocks_begin_nop}
\unexpanded\def\strc_blocks_begin_yes_yes[#1]%
{\strc_blocks_begin_indeed{#1}}
\unexpanded\def\strc_blocks_begin_nop
{\strc_blocks_begin_indeed{}}
\unexpanded\def\strc_blocks_begin_indeed#1%
{\normalexpanded{\buff_pickup{\??block}{\e!begin\m_block}{\e!end\m_block}}%
{}%
{\clf_savestructureblock{\m_block}{\m_subblock}{#1}{\??block}}%
\plusone}
\let\strc_blocks_setup\relax
\newconstant \c_strc_blocks_index
\newconditional\c_strc_blocks_display
\unexpanded\def\dostarthiddenblock % called at lua end
{\begingroup
\visiblefalse % blocks float
\startnointerference
\strc_start_block}
\unexpanded\def\dostophiddenblock % called at lua end
{\strc_stop_block
\stopnointerference
\endgroup}
\unexpanded\def\dostartnormalblock % called at lua end
{\begingroup
\visibletrue
\strc_start_block}
\unexpanded\def\dostopnormalblock % called at lua end
{\strc_stop_block
\endgroup}
\def\strc_start_block#1#2%
{\edef\currentblock{#2}%
\c_strc_blocks_index#1\relax
\strc_blocks_setup
\let\strc_blocks_setup\relax
\edef\p_alternative{\blockparameter\c!alternative}%
\ifx\p_alternative\v!text
\setfalse\c_strc_blocks_display
\else
\settrue\c_strc_blocks_display
\fi
\ifconditional\c_strc_blocks_display
\blockparameter\c!before
\fi
\begingroup
\usesetupsparameter\blockparameter\relax
\dostarttagged\t!block\currentblock
\useblockstyleandcolor\c!style\c!color
\blockparameter\c!inner % old
\ifconditional\c_strc_blocks_display
\usealignparameter\blockparameter
\else
\blockparameter\c!left
\fi
\ignorespaces}
\def\strc_stop_block
{\removeunwantedspaces
\ifconditional\c_strc_blocks_display
\par
\else
\blockparameter\c!right
\fi
\dostoptagged
\endgroup
\ifconditional\c_strc_blocks_display
\blockparameter\c!after
\fi}
\def\strc_blocks_set_state[#1][#2][#3]% state name tag
{\clf_setstructureblockstate{#1}{#2}{#3}}
\def\strc_blocks_select[#1][#2][#3][#4]% state name tag setups
{\begingroup
\doifelseassignment{#3}
{\getparameters[\??blocktemp][\c!criterium=\v!text,#3]%
\def\strc_blocks_setup{\setupcurrentblock[#3]}%
\clf_selectstructureblock{#1}{#2}{}{\csname\??blocktemp\c!criterium\endcsname}}
{\getparameters[\??blocktemp][\c!criterium=\v!text,#4]%
\def\strc_blocks_setup{\setupcurrentblock[#4]}%
\clf_selectstructureblock{#1}{#2}{#3}{\csname\??blocktemp\c!criterium\endcsname}}%
\endgroup}
\def\blockuservariable#1%
{\clf_structureblockuservariable\c_strc_blocks_index{#1}}
% hide : save, if [+] also hidden execute
% keep : save and normal execute
% use : normal execute unless [-]
% process: hidden execute unless [-]
% select : idem use
\unexpanded\def\hideblocks {\dotripleempty \strc_blocks_set_state[hide]}
\unexpanded\def\keepblocks {\dotripleempty \strc_blocks_set_state[keep]}
\unexpanded\def\useblocks {\doquadrupleempty\strc_blocks_select [use]}
\unexpanded\def\processblocks{\doquadrupleempty\strc_blocks_select [process]}
\unexpanded\def\selectblocks {\doquadrupleempty\strc_blocks_select [use]}
\protect \endinput
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