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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}%
\frozen\protected\edefcsname\e!begin\currentblock\endcsname{\strc_blocks_begin{\currentblock}}%
\frozen \letcsname \e!end \currentblock\endcsname\donothing
\to \everydefineblock
% 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>"
\lettonothing\m_block
\lettonothing\m_subblock
\protected\def\strc_blocks_begin#1%
{\edef\m_block{#1}%
\lettonothing\m_subblock
\doifelsenextoptionalcs\strc_blocks_begin_yes\strc_blocks_begin_nop}
\protected\def\strc_blocks_begin_yes[#1]%
{\doifelseassignmentcs{#1}%
\strc_blocks_begin_indeed
\strc_blocks_begin_tagged
{#1}}
\protected\def\strc_blocks_begin_tagged#1%
{\edef\m_subblock{#1}%
\doifelsenextoptionalcs\strc_blocks_begin_yes_yes\strc_blocks_begin_nop}
\protected\def\strc_blocks_begin_yes_yes[#1]%
{\strc_blocks_begin_indeed{#1}}
\protected\def\strc_blocks_begin_nop
{\strc_blocks_begin_indeed{}}
\protected\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}
% \tolerant\protected\def\strc_blocks_begin#1#*[#2]#*[#3]% #:#/% get rid of spaces and pars
% {\edef\m_block{#1}%
% \lettonothing\m_subblock
% \ifhastok={#2}%
% \expandafter\strc_blocks_begin_a % [settings]
% \orelse\ifparameter#2\or
% \expandafter\strc_blocks_begin_b % [tag] [settings]
% \else
% \expandafter\strc_blocks_begin_c %
% \fi{#2}{#3}}% #4}
%
% \protected\def\strc_blocks_begin_a#1#2% settings dummy
% {\normalexpanded{\buff_pickup{\??block}{\e!begin\m_block}{\e!end\m_block}}%
% {}%
% {\clf_savestructureblock{\m_block}{\m_subblock}{#1}{\??block}}%
% \plusone}
%
% \protected\def\strc_blocks_begin_b#1#2% tag settings
% {\edef\m_subblock{#1}%
% \strc_blocks_begin_a{#2}{}}
%
% \protected\def\strc_blocks_begin_c#1#2%
% {\strc_blocks_begin_a{}{}}
\let\strc_blocks_setup\relax
\newconstant \c_strc_blocks_index
\newconditional\c_strc_blocks_display
\permanent\protected\def\dostarthiddenblock % called at lua end
{\begingroup
\visiblefalse % blocks float
\startnointerference
\strc_start_block}
\permanent\protected\def\dostophiddenblock % called at lua end
{\strc_stop_block
\stopnointerference
\endgroup}
\permanent\protected\def\dostartnormalblock % called at lua end
{\begingroup
\visibletrue
\strc_start_block}
\permanent\protected\def\dostopnormalblock % called at lua end
{\strc_stop_block
\endgroup}
\def\strc_start_block#1#2%
{\cdef\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}
\tolerant\def\strc_blocks_set_state[#1]#*[#2]#*[#3]% state name tag % todo: we could use the lua one directly
{\clf_setstructureblockstate{#1}{#2}{#3}}
\tolerant\def\strc_blocks_select[#1]#*[#2]#*[#3]#*[#4]% state name tag setups
{\begingroup
\ifhastok={#3}%
\getparameters[\??blocktemp][\c!criterium=\v!text,#3]%
\def\strc_blocks_setup{\setupcurrentblock[#3]}%
\clf_selectstructureblock{#1}{#2}{}{\begincsname\??blocktemp\c!criterium\endcsname}%
\else
\getparameters[\??blocktemp][\c!criterium=\v!text,#4]%
\def\strc_blocks_setup{\setupcurrentblock[#4]}%
\clf_selectstructureblock{#1}{#2}{#3}{\begincsname\??blocktemp\c!criterium\endcsname}%
\fi
\endgroup}
\permanent\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
\permanent\protected\def\hideblocks {\strc_blocks_set_state[hide]}
\permanent\protected\def\keepblocks {\strc_blocks_set_state[keep]}
\permanent\protected\def\useblocks {\strc_blocks_select [use]}
\permanent\protected\def\processblocks{\strc_blocks_select [process]}
\permanent\protected\def\selectblocks {\strc_blocks_select [use]}
\permanent\protected\def\doifelseblocksempty{\clf_doifelsestructureblocksempty} % {name}{tag}{criterium}
\protect \endinput
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