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%D \module
%D [ file=strc-bkm,
%D version=2009.04.01,
%D title=\CONTEXT\ Structure Macros,
%D subtitle=Bookmarks,
%D author=Wolfgang Schuster,
%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 / Userdata}
\registerctxluafile{strc-usr}{}
%D It's a bit like blocks that also use buffers but more lightweight and with
%D inplace settings.
%D
%D \starttyping
%D \defineuserdata [test] [style=italic]
%D
%D \samplefile{klein}
%D
%D \startuserdata [before=\blank,after=\blank,color=red]
%D \samplefile{greenfield}
%D \stopuserdata
%D
%D \samplefile{sapolsky}
%D
%D \startuserdata [test]
%D \samplefile{bryson}
%D \stopuserdata
%D
%D \samplefile{jojomayer}
%D
%D \startuserdata [test] [before=\blank,after=\blank,color=red]
%D \samplefile{linden}
%D \stopuserdata
%D
%D \samplefile{montgomery}
%D \stoptyping
%D
%D Or from \LUA:
%D
%D \starttyping
%D \startluacode
%D context.startuserdata({color="blue"})
%D context.samplefile("klein")
%D context.stopuserdata()
%D \stopluacode
%D \stoptyping
%D
%D An example of an alternative:
%D
%D \starttyping
%D \defineuserdataalternative [epigraph] [renderingsetup=userdata:epigraph]
%D
%D \startsetups [userdata:epigraph]
%D \startframedtext [location=right,frame=off,align={flushleft,broad},style=\tfx,offset=.25ex,width=.5\textwidth]
%D \begstrut\inlinebuffer[userdata]\endstrut
%D \hairline
%D \wordright{\userdataparameter{author}}
%D \stopframedtext
%D \stopsetups
%D
%D \defineuserdata
%D [epigraph]
%D [alternative=epigraph]
%D
%D \startuserdata [epigraph] [author={Sean B. Carrol}]
%D The fraction of fossil olfactory receptor genes is significantly higher in
%D all species with full color vision. This suggests that the evolution of
%D trichromatic vision --- which allows these primates to detect food, mates,
%D and danger with visual cues --- has reduced their reliance on the sense of
%D smell.
%D \stopuserdata
%D
%D \startuserdata [epigraph] [author={Sean B. Carrol}]
%D \samplefile{carrol}
%D \stopuserdata
%D \stoptyping
\unprotect
\installnamespace {userdata}
\installnamespace {userdataalternative}
\installnamespace {userdatarenderings}
\installcommandhandler \????userdata {userdata} \????userdata
\installcommandhandler \????userdataalternative {userdataalternative} \????userdataalternative
\appendtoks
\frozen\protected\instance\edefcsname\e!start\currentuserdata\endcsname{\userdata_start_instance{\currentuserdata}}%
\frozen\protected\instance\letcsname \e!stop \currentuserdata\endcsname\userdata_stop_instance
\to \everydefineuserdata
\permanent\protected\def\startuserdata
{\begingroup
\lettonothing\currentuserdata
\doifelsenextoptionalcs\userdata_start_delayed\userdata_start_indeed}
\def\userdata_start_delayed[#1]%
{\doifelseassignmentcs{#1}%
\userdata_start_delayed_parameters
\userdata_start_delayed_name
[#1]}
\def\userdata_start_delayed_parameters[#1]%
{\setupcurrentuserdata[#1]%
\userdata_start_indeed}
\def\userdata_start_delayed_name[#1]%
{\edef\currentuserdata{#1}%
\checkuserdataparent
\doifelsenextoptionalcs\userdata_start_delayed_parameters\userdata_start_indeed}
\protected\tolerant\def\userdata_start_instance#1#*[#2]%
{\begingroup
\edef\currentuserdata{#1}%
\setupcurrentuserdata[#2]%
\grabbufferdatadirect
% {\s!userdata:\currentuserdata}%
{\s!userdata}% unnested, as before
{\e!start\currentuserdata}%
{\e!stop \currentuserdata}}
\def\userdata_start_indeed
{\grabbufferdatadirect
% {\s!userdata:\currentuserdata}%
{\s!userdata}% unnested, as before
{\csstring\startuserdata}%
{\csstring\stopuserdata}}
\permanent\protected\def\stopuserdata
{\userdataparameter\c!before
\dostarttagged\t!userdata\currentuserdata
\begingroup
\useuserdatastyleandcolor\c!style\c!color
\usealignparameter\userdataparameter
\edef\currentuserdataalternative{\userdataparameter\c!alternative}%
\ifcsname\currentuserdataalternativehash\s!parent\endcsname \else
\let\currentuserdataalternative\s!default
\fi
\usesetupsparameter\userdataparameter
\edef\p_renderingsetup{\userdataalternativeparameter\c!renderingsetup}%
\directsetup\p_renderingsetup
\endgroup
\dostoptagged
\userdataparameter\c!after
\endgroup}
\aliased\let\userdata_stop_instance\stopuserdata
% kind of nested, when we need it:
%
% \permanent\tolerant\protected\def\getuserdata [#1]{\normalexpanded{\getbufferdata[\s!userdata:\ifparameter#1\or#1\else\currentuserdata\fi]}}
% \permanent\tolerant\protected\def\getinlineuserdata[#1]{\normalexpanded{\inlinebuffer [\s!userdata:\ifparameter#1\or#1\else\currentuserdata\fi]}}
% unnested, as before:
\permanent\tolerant\protected\def\getuserdata [#1]{\getbufferdata[\s!userdata]}
\permanent\tolerant\protected\def\getinlineuserdata[#1]{\inlinebuffer [\s!userdata]}
\defineuserdataalternative
[\s!default]
[\c!renderingsetup=\????userdatarenderings:\s!default]
% \startsetups[\????userdatarenderings:\s!default]
% \userdataparameter\c!before
% \usesetupsparameter\userdataparameter
% \getbufferdata[\s!userdata]
% \userdataparameter\c!after
% \stopsetups
\startsetups[\????userdatarenderings:\s!default]
\getuserdata
\stopsetups
\setupuserdata
[\c!alternative=\s!default]
\protect
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