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authorHans Hagen <pragma@wxs.nl>2020-11-23 19:48:34 +0100
committerContext Git Mirror Bot <phg@phi-gamma.net>2020-11-23 19:48:34 +0100
commit18499e46a49b8ccf4346686d1cf626ada33935b8 (patch)
treebd0ae7b601b323e20954c10c07598637d9403e00 /tex/context/base/mkxl/mult-aux.mkxl
parent4b089e589d39346a66a27d04f9857fe16e4b7b41 (diff)
downloadcontext-18499e46a49b8ccf4346686d1cf626ada33935b8.tar.gz
2020-11-23 18:39:00
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+%D \module
+%D [ file=mult-aux,
+%D version=2010.08.2,
+%D title=\CONTEXT\ Multilingual Macros,
+%D subtitle=Helpers,
+%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.
+
+%D A generalization of \MKIV-like inheritance. Just something to play with
+%D (interface might change). The code here evolved in an email exchange between me
+%D and Wolgang Schuster.
+
+\writestatus{loading}{ConTeXt Multilingual Macros / Helpers}
+
+\registerctxluafile{mult-aux}{}
+
+\unprotect
+
+\immutable\edef\??empty{\Uchar25} \immutable\letvalue{\Uchar25}\empty % hex 19
+
+% \edef\s!parent{\Uchar29} % inlining  is ugly, a tiny bit faster, but neglectable on a run
+
+%D \starttyping
+%D \unprotect
+%D \def\????aa{@@@@aa}
+%D
+%D \installparameterhandler \????aa {whatever}
+%D \installsetuphandler \????aa {whatever}
+%D \installdefinehandler \????aa {whatever} \????aa % #3 == defaultroot
+%D \installfontandcolorhandler\????aa {whatever}
+%D
+%D % \installcommandhandler \????aa {whatever} \????aa
+%D \protect
+%D
+%D % \whateverparameter \c!test
+%D % \whateverparameterhash \c!test
+%D % \namedwhateverparameter \mycurrentwhatever \c!test
+%D % \usewhateverstyleandcolor \c!style \c!color
+%D % \everydefinewhatever (sets \currentwhatever)
+%D % \everypresetwhatever (can be used to reset parameters as we can redefine)
+%D % \everysetupwhatever (sets \currentwhatever)
+%D
+%D \starttext
+%D \definewhatever[first] \definewhatever[second][first]
+%D test: \def\currentwhatever{first} \whateverparameter{method} \par
+%D \setupwhatever [method=unset] test: \def\currentwhatever{first} \whateverparameter{method} \par
+%D \setupwhatever[first] [method=first] test: \def\currentwhatever{first} \whateverparameter{method} \par
+%D test: \def\currentwhatever{second} \whateverparameter{method} \par
+%D \setupwhatever[second][method=second] test: \def\currentwhatever{second} \whateverparameter{method} \par
+%D \stoptext
+%D \stoptyping
+
+% problem: every* could clash
+%
+% There can be less {} in the following definitions if we assume \??aa and \c!somecs
+%
+% todo: \def\detokenized...parameter#1{\detokenize\expandafter\expandafter\expandafter{\csname#1#2\endcsname}} % always root
+%
+% it might be more efficient to do this at the lua and
+%
+% watch the push/pop and predefinition of current .. this is needed for nested
+% definitions and overloaded defines using the predefined one
+
+% todo: add (relaxed) postsetup and postdefine hooks, just after the everys
+
+%D Start of experimental code: especially tables can have many assignments and
+%D although most time is spent in the typesetting anyway, we can squeeze out a
+%D little bit. Of course having 500 rows of 50 columns each with some setting does
+%D not happen that often. One should keep in mind that in the average document
+%D having some 500 assignments is no exception but there we're talking of
+%D neglectable runtime for them. Of course in the definitions below there is no real
+%D gain, only in the generated \setup* commands. Another situation with many
+%D assignments is \XML\ where we can pass attributes and normally don't do testing
+%D of them making sense.
+%
+% \testfeatureonce{100000}{\getparameters[bla][a=111,b=222,c=333]}% 1.669s
+% \testfeatureonce{100000}{\mult_interfaces_get_parameters{bla} [a=111,b=222,c=333]}% 1.529s
+% \testfeatureonce{100000}{\def\m_mult_interfaces_namespace{bla}\mult_interfaces_get_parameters_indeed[a=111,b=222,c=333]}% 1.466s
+
+% KEEP THIS:
+%
+% \let\m_mult_interfaces_namespace\empty
+%
+% \def\mult_interfaces_get_parameters#1[#2%
+% {\if\noexpand#2]%
+% \expandafter\gobbleoneargument
+% \else
+% \def\m_mult_interfaces_namespace{#1}%
+% \expandafter\mult_interfaces_get_parameters_indeed
+% \fi#2}
+%
+% \def\mult_interfaces_get_parameters_indeed#1]% namespace already set
+% {\mult_interfaces_get_parameters_item#1,],^^^^0004}
+%
+% \def\mult_interfaces_get_parameters_item#1,#2% #2 takes space before ,
+% {\if,#1,% dirty trick for testing #1=empty
+% \expandafter\mult_interfaces_get_parameters_item
+% \orelse\if]#1%
+% \expandafter\gobbleoneargument
+% \else
+% \mult_interfaces_get_parameters_assign#1==\empty^^^^0004%
+% % \expandafter\mult_interfaces_get_parameters_item % saves skipping when at end
+% \fi#2}
+%
+% \def\mult_interfaces_get_parameters_error#1#2% #3%
+% {\mult_interfaces_get_parameters_error_indeed{#1}{#2}%
+% \gobbleoneargument}
+%
+% \def\mult_interfaces_get_parameters_error_indeed#1#2%
+% {\showassignerror{#2}{\the\inputlineno\space(#1)}}
+%
+% \def\mult_interfaces_get_parameters_assign#1=#2=#3#0^^^^0004%
+% {\ifx\empty#1\empty
+% \expandafter\mult_interfaces_get_parameters_error
+% \orelse\ifx#3\empty
+% \expandafter\mult_interfaces_get_parameters_error
+% \else
+% \expandafter\mult_interfaces_adef % assignment def
+% \fi
+% \m_mult_interfaces_namespace{#1}{#2}%
+% \doubleexpandafter\mult_interfaces_get_parameters_item}
+%
+% \startinterface english
+%
+% % some 10% faster
+%
+% \let\mult_interfaces_get_parameters_error\undefined
+%
+% \def\mult_interfaces_get_parameters_error_one#0\csname#2#3\endcsname#0%
+% {\mult_interfaces_get_parameters_error_indeed{#2}{#3}\iftrue}
+%
+% \def\mult_interfaces_get_parameters_error_two#0\csname#2#3\endcsname#0%
+% {\mult_interfaces_get_parameters_error_indeed{#2}{#3}}
+%
+% \def\mult_interfaces_get_parameters_assign#1=#2=#3#0^^^^0004%
+% {\ifx\empty#1\empty
+% \mult_interfaces_get_parameters_error_one
+% \orelse\ifx#3\empty
+% \mult_interfaces_get_parameters_error_two
+% \else
+% \defcsname\m_mult_interfaces_namespace#1\endcsname{#2}%
+% \fi
+% \doubleexpandafter\mult_interfaces_get_parameters_item}
+%
+% \stopinterface
+%
+% \newif\ifassignment
+%
+% \def\mult_check_for_assignment_indeed#0=#2#0^^^^0004%
+% {\if#2^^^^0003\assignmentfalse\else\assignmenttrue\fi}
+%
+% \def\mult_check_for_assignment_indeed_begin_#0=#2#0^^^^0004%
+% {\if#2^^^^0003}
+%
+% \def\mult_check_for_assignment#1%
+% {\expandafter\mult_check_for_assignment_indeed\detokenize{#1}=^^^^0003^^^^0003^^^^0004}
+%
+% % End of experimental code.
+
+%D We keep the above as reference, btu from now on experiment with the following
+%D implementation. In principle this one is faster, but because normally we don't
+%D have that many assignments it doesn't get noticed. For instance, the \LUAMETATEX\
+%D manual does less than 6000 assignments and the payoff starts around a tenfold of
+%D that. But \unknown\ it's less tracing, so that's another benefit.
+
+%D Watch out: we accept that a \[k=v,,k=v] will generate a case where a key can become
+%D a comma and trigger a warning but we intercept that elsewhere. The alternative is
+%D to skip to the comma first which takes more time.
+
+\let\m_mult_interfaces_namespace\empty
+
+\def\mult_interfaces_get_parameters#1[%
+ {\def\m_mult_interfaces_namespace{#1}%
+ \futureexpandis]\gobbleoneargument\mult_interfaces_get_parameters_indeed}
+
+\def\mult_interfaces_get_parameters_indeed#1]%
+ {\mult_interfaces_get_parameters_item#1\ignorearguments\ignorearguments}
+
+\def\mult_interfaces_get_parameters_item#*#1,%
+ {\ifarguments \else
+ \mult_interfaces_get_parameters_item_okay#1,\ignorearguments
+ \expandafter\mult_interfaces_get_parameters_item
+ \fi}
+
+\def\mult_interfaces_get_parameters_item_okay#1=#2,%
+ {\ifarguments
+ % done
+ \or
+ \mult_interfaces_get_parameters_item_error
+ \else
+ \mult_interfaces_adef\m_mult_interfaces_namespace{#1}{#2}%
+ \fi}
+
+% \def\mult_interfaces_get_parameters_item_error#0#0#0#4#5%
+% {\if,#5\else\mult_interfaces_get_parameters_error_indeed{#4}{#5}\fi}
+
+\def\mult_interfaces_get_parameters_item_error#-#-#-#1#2%
+ {\if,#2\else\mult_interfaces_get_parameters_error_indeed{#1}{#2}\fi}
+
+\startinterface english
+
+ \def\mult_interfaces_get_parameters_item_okay#1=#2,%
+ {\ifarguments
+ % done
+ \or
+ \mult_interfaces_get_parameters_item_error
+ \else
+ \defcsname\m_mult_interfaces_namespace#1\endcsname{#2}%
+ \fi}
+
+ \def\mult_interfaces_get_parameters_item_error#-\defcsname#1#2\endcsname#-%
+ {\if,#2\else\mult_interfaces_get_parameters_error_indeed{#1}{#2}\fi}
+
+\stopinterface
+
+%D Used?
+
+\def\mult_check_for_assignment_indeed#-=#1#-^^^^0004%
+ {\if#1^^^^0003\assignmentfalse\else\assignmenttrue\fi}
+
+\def\mult_check_for_assignment_indeed_begin_#-=#1#-^^^^0004%
+ {\if#1^^^^0003}
+
+\def\mult_check_for_assignment#1%
+ {\expandafter\mult_check_for_assignment_indeed\detokenize{#1}=^^^^0003^^^^0003^^^^0004}
+
+%D Beware, zero arguments is an assignment!
+
+\def\mult_aux_no_assignment_indeed#1=#2]{\ifcase\ifarguments\plusone\or\zerocount\else\plusone\fi}
+\def\mult_aux_no_assignment#1]{\mult_aux_no_assignment_indeed#1\ignorearguments\relax}
+
+%D This can give wrong results when we pass e.g. \type{\c!format}, so either we need
+%D to use the \type {\k!} ones, but these are not defined in the english interface
+%D so from now on we assume that the low level ones are used with the symbolic names
+%D and that only the high level setup commands are used with language specific
+%D interfaces.
+
+% \startinterface english
+ \protected\def\mult_interfaces_let #1#2{\letcsname#1#2\endcsname}
+ \protected\def\mult_interfaces_lete#1#2{\letcsname#1#2\endcsname\empty}
+ \protected\def\mult_interfaces_def #1#2{\defcsname#1#2\endcsname}
+ \protected\def\mult_interfaces_edef#1#2{\edefcsname#1#2\endcsname}
+ \protected\def\mult_interfaces_gdef#1#2{\gdefcsname#1#2\endcsname}
+ \protected\def\mult_interfaces_xdef#1#2{\xdefcsname#1#2\endcsname}
+% \stopinterface
+
+%D Do, we only interface the assignment definition:
+
+\protected\def\mult_interfaces_adef#1#2{\defcsname#1\ifcsname\k!prefix!#2\endcsname\csname\k!prefix!#2\endcsname\else#2\fi\endcsname}
+
+\startinterface english
+ \protected\def\mult_interfaces_adef#1#2{\defcsname#1#2\endcsname}
+\stopinterface
+
+% the commented detokenized variant that backtracks ... needs testing usage first
+%
+% \let\whatever\relax
+%
+% \definetest[oeps][bagger=\whatever]
+%
+% \def\currenttest{oeps} \edef\hans{\detokenizedtestparameter{bagger}}\meaning\hans\par
+% \def\currenttest{oeps} \edef\hans{\detokenizedtestparameter{reggab}}\meaning\hans\par
+%
+% slower: \def#3##1{\csname\ifcsname#1#2:##1\endcsname\expandafter\csstring\lastnamedcs\else\expandafter#5\csname#1#2:\s!parent\endcsname{##1}\fi\endcsname}%
+
+%D pre-expansion can be a bit faster but handly any effect on a normal run so let's
+%D go for saving some memory
+
+\def\mult_interfaces_detokenize{\expandafter\expandafter\expandafter\detokenize\expandafter\expandafter\expandafter}
+
+\protected\def\mult_interfaces_install_parameter_handler#1#2#3#4#5#6#7#8#9%
+ {\frozen\def#3##1{\csname\ifcsname#1#2:##1\endcsname#1#2:##1\else\expandafter#5\csname#1#2:\s!parent\endcsname{##1}\fi\endcsname}%
+ \frozen\def#4##1##2{\ifcsname##1:##2\endcsname##1:##2\else\expandafter#5\csname##1:\s!parent\endcsname{##2}\fi}%
+ \frozen\edef#5##1##2{\noexpand\ifx##1\relax\??empty\noexpand\else\noexpand#4##1{##2}\noexpand\fi}% is {} needed around ##1 ?
+ \frozen\def#6##1##2{\csname\ifcsname#1##1:##2\endcsname#1##1:##2\else\expandafter#5\csname#1##1:\s!parent\endcsname{##2}\fi\endcsname}%
+ \frozen\def#7##1{\detokenize\expandafter\expandafter\expandafter{\csname#1#2:##1\endcsname}}% always root, no backtrack
+ \frozen\def#8##1{\begincsname#1#2:##1\endcsname}%
+ % TODO
+ \frozen\def#9##1##2{\expandafter\let\expandafter##1\csname\ifcsname#1#2:##2\endcsname#1#2:##2\else\expandafter#5\csname#1#2:\s!parent\endcsname{##2}\fi\endcsname}}
+
+\permanent\protected\def\installparameterhandler#1#2%
+ {\mutable\letcsname current#2\endcsname\empty
+ \normalexpanded
+ {\mult_interfaces_install_parameter_handler
+ {\noexpand#1}% \??aa
+ \expandafter\noexpand\csname current#2\endcsname
+ \expandafter\noexpand\csname #2parameter\endcsname
+ \expandafter\noexpand\csname do#2parameter\endcsname % or: #2_parameter
+ \expandafter\noexpand\csname do#2parentparameter\endcsname % or: #2_parent_parameter
+ \expandafter\noexpand\csname named#2parameter\endcsname
+ \expandafter\noexpand\csname detokenized#2parameter\endcsname
+ \expandafter\noexpand\csname direct#2parameter\endcsname
+ \expandafter\noexpand\csname letfrom#2parameter\endcsname}} % strict#2parameter is gone
+
+\protected\def\mult_interfaces_install_root_parameter_handler#1#2#3%
+ {\frozen\def#2##1{\detokenize\expandafter\expandafter\expandafter{\csname#1:##1\endcsname}}% always root
+ \frozen\def#3##1{\begincsname#1:##1\endcsname}}
+
+\permanent\protected\def\installrootparameterhandler#1#2%
+ {\normalexpanded
+ {\mult_interfaces_install_root_parameter_handler
+ {\noexpand#1}% \??aa
+ \expandafter\noexpand\csname detokenizedroot#2parameter\endcsname
+ \expandafter\noexpand\csname root#2parameter\endcsname}}
+
+\protected\def\mult_interfaces_install_parameter_hash_handler#1#2#3#4#5#6#7#8#9%
+ {\frozen\def#3##1{#1#4{#1#2}{##1}:}% leading #1 was missing .. is this one used?
+ \frozen\def#4##1##2{\ifcsname##1:##2\endcsname##1\else\expandafter#5\csname##1:\s!parent\endcsname{##2}\fi}%
+ \frozen\def#5##1##2{\ifx##1\relax\else#4##1{##2}\fi}%
+ \frozen\def#6{#1#2:}%
+ \frozen\def#7##1{#1##1:}%
+ \frozen\def#8{\ifempty#2\orelse\ifcsname#1#2:\s!parent\endcsname\else\letcsname#1#2:\s!parent\endcsname#1\fi}%
+ \frozen\protected\def#9##1{\edefcsname#1##1:\s!parent\endcsname{#1#2}}}
+
+\permanent\protected\def\installparameterhashhandler#1#2%
+ {\mutable\letcsname current#2\endcsname\empty
+ \immutable\letcsname#2namespace\endcsname#1%
+ \normalexpanded
+ {\mult_interfaces_install_parameter_hash_handler
+ {\noexpand#1}% \??aa
+ \expandafter\noexpand\csname current#2\endcsname
+ \expandafter\noexpand\csname #2parameterhash\endcsname
+ \expandafter\noexpand\csname do#2parameterhash\endcsname % or : #2_parameter_hash
+ \expandafter\noexpand\csname do#2parentparameterhash\endcsname % or : #2_parent_parameter_hash
+ \expandafter\noexpand\csname current#2hash\endcsname
+ \expandafter\noexpand\csname named#2hash\endcsname
+ \expandafter\noexpand\csname check#2parent\endcsname
+ \expandafter\noexpand\csname chaintocurrent#2\endcsname}}
+
+%D In \MKIV\ we can probably use the english variant for all other languages too.
+
+% todo: inline the def/let
+
+% \startinterface english
+ \protected\def\mult_interfaces_install_parameter_set_handler#1#2#3#4#5#6%
+ {\frozen\protected\def#3##1{\defcsname#1#2:##1\endcsname}% ##1 {##2} (braces are mandate)
+ \frozen\protected\def#4##1{\edefcsname#1#2:##1\endcsname}% ##1 {##2} (braces are mandate)
+ \frozen\protected\def#5##1{\letcsname#1#2:##1\endcsname}% ##1 ##2
+ \frozen\protected\def#6##1{\letcsname#1#2:##1\endcsname\empty}}% ##1
+% \stopinterface
+
+\permanent\protected\def\installparametersethandler#1#2%
+ {\mutable\letcsname current#2\endcsname\empty
+ \normalexpanded
+ {\mult_interfaces_install_parameter_set_handler
+ {\noexpand#1}% \??aa
+ \expandafter\noexpand\csname current#2\endcsname
+ \expandafter\noexpand\csname set#2parameter\endcsname
+ \expandafter\noexpand\csname setexpanded#2parameter\endcsname
+ \expandafter\noexpand\csname let#2parameter\endcsname
+ \expandafter\noexpand\csname reset#2parameter\endcsname}}
+
+\let\dousecurrentstyleparameter\relax
+\let\dousecurrentcolorparameter\relax
+
+\let\currentstyleparameter\empty
+\let\currentcolorparameter\empty
+
+\protected\def\mult_interfaces_install_style_and_color_handler#1#2#3#4%
+ {\frozen\protected\def#2##1##2% style color
+ {\edef\currentstyleparameter{#1{##1}}% this name is public (can also set color e.g. in underline)
+ \ifempty\currentstyleparameter\else\dousecurrentstyleparameter\fi
+ \edef\currentcolorparameter{#1{##2}}% this name is public (so we do this after the style switch)
+ \ifempty\currentcolorparameter\else\dousecurrentcolorparameter\fi}%
+ \frozen\protected\def#3##1% style
+ {\edef\currentstyleparameter{#1{##1}}% this name is public
+ \ifempty\currentstyleparameter\else\dousecurrentstyleparameter\fi}%
+ \frozen\protected\def#4##1% color
+ {\edef\currentcolorparameter{#1{##1}}% this name is public
+ \ifempty\currentcolorparameter\else\dousecurrentcolorparameter\fi}}
+
+\permanent\protected\def\installstyleandcolorhandler#1#2%
+ {\normalexpanded
+ {\mult_interfaces_install_style_and_color_handler
+ \expandafter\noexpand\csname #2parameter\endcsname
+ \expandafter\noexpand\csname use#2styleandcolor\endcsname % maybe an alias use#2styleandcolorparameters
+ \expandafter\noexpand\csname use#2styleparameter\endcsname
+ \expandafter\noexpand\csname use#2colorparameter\endcsname}}
+
+\let\definehandlerparent\empty
+
+\def\mult_check_for_parent#1#2#3#4%
+ {\ifcsname#1#4:\s!parent\endcsname\orelse\ifx#4\empty\else
+ \writestatus\m!system{error: invalid parent #4 for #3, #4 defined too (best check it)}%
+ \edefcsname#1#4:\s!parent\endcsname{#2}%
+ \fi}
+
+ \def\mult_interfaces_chain#1#2{\ifcsname#1#2:\s!chain\endcsname\lastnamedcs\space\fi}
+\permanent\def\getparentchain #1#2{\begincsname#1#2:\s!chain\endcsname}
+\permanent\def\getcurrentparentchain#1#2{\begincsname#1#2:\s!chain\endcsname}
+
+% we could have a \setcurrent... macro and then always make them a frozen
+% but it might have a little impact on performance ... something to leave
+% to when we're done with the transition (it's kind of massive)
+
+\protected\def\mult_interfaces_install_define_handler#1#2#3#4#5#6#7#8% why is \expanded still needed in clones
+ {\newtoks#5%
+ \newtoks#6%
+ \frozen\tolerant\protected\def#2[##1]##*[##2]##*[##3]% [child][parent][settings] | [child][settings] | [child][parent] | [child]
+ {\let#8#4%
+ % watch out: no \edef#4{##1} before the ifarguments because #1 can have macros
+ \ifarguments
+ \let#4\empty
+ \the#5% predefine
+ \let#7\empty
+ \letcsname#1#4:\s!chain\endcsname\empty
+ \edefcsname#1#4:\s!parent\endcsname{#3}%
+ \or
+ \edef#4{##1}%
+ \the#5% predefine
+ \let#7\empty
+ \edefcsname#1#4:\s!chain\endcsname{##1}%
+ \edefcsname#1#4:\s!parent\endcsname{#3}%
+ \or
+ \edef#4{##1}%
+ \the#5% predefine
+ \relax
+ \ifhastok={##2}%
+ \let#7\empty
+ \edefcsname#1#4:\s!chain\endcsname{##1}%
+ \edefcsname#1#4:\s!parent\endcsname{#3}%
+ \mult_interfaces_get_parameters{#1#4:}[##2]%
+ \else
+ \edef#7{##2}%
+ \ifempty#7%
+ \edefcsname#1#4:\s!chain\endcsname{##1}%
+ \edefcsname#1#4:\s!parent\endcsname{#3}%
+ \else
+ \mult_check_for_parent{#1}{#3}#4#7%
+ \edefcsname#1#4:\s!chain\endcsname{\mult_interfaces_chain#1{##2}##1}%
+ \edefcsname#1#4:\s!parent\endcsname{#1##2}%
+ \fi
+ \fi
+ \or
+ \edef#4{##1}%
+ \the#5% predefine
+ \edef#7{##2}%
+ \mult_check_for_parent{#1}{#3}#4#7%
+ \edefcsname#1#4:\s!chain\endcsname{\mult_interfaces_chain#1{##2}##1}%
+ \edefcsname#1#4:\s!parent\endcsname{#1##2}%
+ \mult_interfaces_get_parameters{#1#4:}[##3]%
+ \fi
+ \the#6%
+ \let#4#8}}
+
+\permanent\protected\def\installdefinehandler#1#2#3%
+ {\mutable\letcsname current#2\endcsname\empty
+ \mutable\letcsname current#2parent\endcsname\empty
+ \normalexpanded
+ {\mult_interfaces_install_define_handler
+ {\noexpand#1}% \??aa
+ \expandafter\noexpand\csname define#2\endcsname
+ {\noexpand#3}% root
+ \expandafter\noexpand\csname current#2\endcsname
+ \expandafter\noexpand\csname everypreset#2\endcsname
+ \expandafter\noexpand\csname everydefine#2\endcsname
+ \expandafter\noexpand\csname current#2parent\endcsname
+ \expandafter\noexpand\csname saved_defined_#2\endcsname}}
+
+\protected\def\mult_interfaces_install_setup_handler#1#2#3#4#5#6#7#8%
+ {\newtoks#4%
+ \newtoks#7%
+ \frozen\protected\def#5{\mult_interfaces_get_parameters{#1#3:}}% no every ! don't change it
+ \frozen\tolerant\protected\def#2[##1]##*[##2]% maybe helper
+ {\let#6#3%
+ \ifnum\lastarguments=\plustwo
+ \def#8####1% we will have a simple one as well
+ {\edef#3{####1}%
+ \mult_interfaces_get_parameters{#1#3:}[##2]%
+ \the#4}%
+ \processcommalist[##1]#8%
+ \else
+ \let#3\empty
+ \mult_interfaces_get_parameters{#1:}[##1]%
+ \the#4%
+ \fi
+ \let#3#6%
+ \the#7}}
+
+\permanent\protected\def\installsetuphandler#1#2%
+ {\mutable\letcsname current#2\endcsname\empty
+ \normalexpanded
+ {\mult_interfaces_install_setup_handler
+ {\noexpand#1}% \??aa
+ \expandafter\noexpand\csname setup#2\endcsname
+ \expandafter\noexpand\csname current#2\endcsname
+ \expandafter\noexpand\csname everysetup#2\endcsname
+ \expandafter\noexpand\csname setupcurrent#2\endcsname
+ \expandafter\noexpand\csname saved_setup_current#2\endcsname
+ \expandafter\noexpand\csname everysetup#2root\endcsname
+ \expandafter\noexpand\csname nested_setup_current#2\endcsname}}
+
+\let\doingrootsetupnamed\plusone % \setuplayout[name][key=value]
+\let\doingrootsetuproot \plustwo % \setuplayout [key=value]
+\let\doingrootsetnamed \plusthree % \setuplayout[name]
+\let\doingrootsetroot \plusfour % \setuplayout
+
+\protected\def\mult_interfaces_install_switch_setup_handler_a#1#2#3%
+ {\frozen\protected\def#3{\mult_interfaces_get_parameters{#1#2:}}}
+
+\protected\def\mult_interfaces_install_switch_setup_handler_b#1#2#3#4#5#6#7#8#9%
+ {\newtoks#5%
+ \newconstant#2%
+ \newtoks#8%
+ \newtoks#9%
+ \frozen\tolerant\protected\def#4[##1]##*[##2]% maybe helper
+ {\ifarguments
+ % \setuplayout
+ \let#6#3% % previous becomes current
+ \let#3\empty % current becomes empty
+ #2\doingrootsetroot
+ \the#5%
+ \the#8% switchsetups
+ \or
+ \ifhastok={##1}%
+ % \setuplayout[key=value]
+ \let#7#3%
+ \let#6#3%
+ \let#3\empty
+ #2\doingrootsetuproot
+ \mult_interfaces_get_parameters{#1:}[##1]%
+ \the#5%
+ \the#8% switchsetups
+ \let#3#7%
+ \else
+ % \setuplayout[whatever]
+ \let#6#3% % previous becomes current
+ \edef#3{##1}% this will catch reset so one needs to test for it
+ \ifempty#3%
+ \let#7#6%
+ #2\doingrootsetuproot
+ \the#5%
+ \the#8% switchsetups
+ \let#3#7%
+ \else
+ #2\doingrootsetnamed
+ \the#5% % we can check for previous vs current
+ \the#8% switchsetups
+ \fi
+ \fi
+ \or
+ % \setuplayout[whatever][key=value]
+ \let#7#3%
+ \let#6#3%
+ \edef#3{##1}%
+ #2\doingrootsetupnamed
+ \mult_interfaces_get_parameters{#1#3:}[##2]%
+ \the#5%
+ \ifx#3#6\the#8\fi % only switchsetups if previous == current
+ \let#3#7%
+ \fi
+ #2\zerocount % mode is always zero at the end
+ \the#9}}
+
+\permanent\protected\def\installswitchsetuphandler#1#2%
+ {\mutable\letcsname current#2\endcsname\empty
+ \mutable\letcsname previous#2\endcsname\empty
+ \normalexpanded
+ {\mult_interfaces_install_switch_setup_handler_a
+ {\noexpand#1}% \??aa
+ \expandafter\noexpand\csname current#2\endcsname
+ \expandafter\noexpand\csname setupcurrent#2\endcsname
+ \mult_interfaces_install_switch_setup_handler_b
+ {\noexpand#1}% \??aa
+ \expandafter\noexpand\csname #2setupmode\endcsname
+ \expandafter\noexpand\csname current#2\endcsname
+ \expandafter\noexpand\csname setup#2\endcsname
+ \expandafter\noexpand\csname everysetup#2\endcsname
+ \expandafter\noexpand\csname previous#2\endcsname
+ \expandafter\noexpand\csname saved_setup_current#2\endcsname
+ \expandafter\noexpand\csname everyswitch#2\endcsname
+ \expandafter\noexpand\csname everysetup#2root\endcsname}}
+
+\protected\def\mult_interfaces_install_auto_setup_handler#1#2#3#4#5#6#7#8%
+ {\newtoks#4%
+ \frozen\protected\def#5{\mult_interfaces_get_parameters{#1#3:}}%
+ \frozen\tolerant\protected\def#2[##1]##*[##2]##*[##3]%
+ {\let#7#3%
+ \ifarguments
+ \let#3\empty
+ \the#5%
+ \or
+ \let#3\empty
+ \mult_interfaces_get_parameters{#1:}[##1]%
+ \the#4%
+ \or
+ \def#8####1%
+ {\edef#3{####1}%
+ #6% checks parent and sets if needed
+ \mult_interfaces_get_parameters{#1#3:}[##2]%
+ \the#4}%
+ \processcommalist[##1]#8%
+ \or
+ \def#8####1%
+ {\edef#3{####1}%
+ \defcsname#1#3:\s!parent\endcsname{#1##2}%
+ \mult_interfaces_get_parameters{#1#3:}[##3]% always sets parent
+ \the#4}%
+ \processcommalist[##1]#8%
+ \fi
+ \let#3#7}}
+
+\permanent\protected\def\installautosetuphandler#1#2%
+ {\mutable\letcsname current#2\endcsname\empty
+ \normalexpanded
+ {\mult_interfaces_install_auto_setup_handler
+ {\noexpand#1}% \??aa
+ \expandafter\noexpand\csname setup#2\endcsname
+ \expandafter\noexpand\csname current#2\endcsname
+ \expandafter\noexpand\csname everysetup#2\endcsname
+ \expandafter\noexpand\csname setupcurrent#2\endcsname
+ \expandafter\noexpand\csname check#2parent\endcsname
+ \expandafter\noexpand\csname saved_setup_current#2\endcsname
+ \expandafter\noexpand\csname nested_setup_current#2\endcsname}}
+
+\permanent\protected\def\installbasicparameterhandler#1#2%
+ {\installparameterhandler {#1}{#2}%
+ \installparameterhashhandler{#1}{#2}%
+ \installparametersethandler {#1}{#2}%
+ \installrootparameterhandler{#1}{#2}}
+
+\permanent\protected\def\installbasicautosetuphandler#1#2#3% \??self name \??parent (can be \??self)
+ {\installbasicparameterhandler{#1}{#2}%
+ \installautosetuphandler {#1}{#2}}
+
+\permanent\protected\def\installstylisticautosetuphandler#1#2#3% \??self name \??parent (can be \??self)
+ {\installbasicparameterhandler{#1}{#2}%
+ \installautosetuphandler {#1}{#2}%
+ \installstyleandcolorhandler {#1}{#2}}
+
+\permanent\protected\def\installcommandhandler#1#2#3% \??self name \??parent (can be \??self)
+ {\installbasicparameterhandler{#1}{#2}%
+ \installdefinehandler {#1}{#2}{#3}%
+ \installsetuphandler {#1}{#2}%
+ \installstyleandcolorhandler {#1}{#2}}
+
+\permanent\protected\def\installswitchcommandhandler#1#2#3% \??self name \??parent (can be \??self)
+ {\installbasicparameterhandler{#1}{#2}%
+ \installdefinehandler {#1}{#2}{#3}%
+ \installswitchsetuphandler {#1}{#2}%
+ \installstyleandcolorhandler {#1}{#2}}
+
+\permanent\protected\def\installautocommandhandler#1#2#3% automatically defined cloned setups
+ {\installbasicparameterhandler{#1}{#2}%
+ \installdefinehandler {#1}{#2}{#3}%
+ \installautosetuphandler {#1}{#2}%
+ \installstyleandcolorhandler {#1}{#2}}
+
+\permanent\protected\def\installsimplecommandhandler#1#2#3% no define (experiment) - use \check*parent when defining
+ {\installbasicparameterhandler{#1}{#2}%
+ \installsetuphandler {#1}{#2}%
+ \installstyleandcolorhandler {#1}{#2}}
+
+%D Many mechanisms have some kind of inheritance in place, and these are the
+%D speed||critical ones. Therefore there is no reason to stick to \type {\@@xxkey}
+%D for the sake of performance. For this reason we also provide a direct variant.
+%D This permits a more consistent treatment of namespaces. A \type
+%D {\whateverparameter} call is three times slower and a \type
+%D {\directwhateverparameter} call two times but for some 100K expansions we only
+%D loose some .1 second which is neglectable given the small amount of expansions in
+%D real runs.
+
+%D We don't need colons for such simple cases.
+
+\protected\def\mult_interfaces_install_direct_parameter_handler#1#2#3#4#5%
+ {\frozen\def#3##1{\begincsname#1##1\endcsname}%
+ \frozen\def#4##1{\detokenize\expandafter\expandafter\expandafter{\csname#1##1\endcsname}}%
+ \frozen\def#5##1{\begincsname#1##1\endcsname}}
+
+\permanent\protected\def\installdirectparameterhandler#1#2%
+ {\mutable\letcsname current#2\endcsname\empty
+ \normalexpanded
+ {\mult_interfaces_install_direct_parameter_handler
+ {\noexpand#1}%
+ \expandafter\noexpand\csname current#2\endcsname
+ \expandafter\noexpand\csname #2parameter\endcsname
+ \expandafter\noexpand\csname detokenized#2parameter\endcsname
+ \expandafter\noexpand\csname direct#2parameter\endcsname}}
+
+\protected\def\mult_interfaces_install_direct_setup_handler#1#2#3#4%
+ {\newtoks#4%
+ \frozen\protected\def#2[##1]{\ifarguments\or\mult_interfaces_get_parameters#1[##1]\fi\the#4}%
+ \frozen\def#3{\mult_interfaces_get_parameters#1}}
+
+\permanent\protected\def\installdirectsetuphandler#1#2%
+ {\normalexpanded
+ {\mult_interfaces_install_direct_setup_handler
+ {\noexpand#1}% \??aa
+ \expandafter\noexpand\csname setup#2\endcsname
+ \expandafter\noexpand\csname setupcurrent#2\endcsname % no \every (we use 'current' for consistency)
+ \expandafter\noexpand\csname everysetup#2\endcsname}}
+
+% \startinterface english
+ \protected\def\mult_interfaces_install_direct_parameter_set_handler#1#2#3#4#5%
+ {\frozen\protected\def#2##1{\defcsname#1##1\endcsname}%
+ \frozen\protected\def#3##1{\edefcsname#1##1\endcsname}%
+ \frozen\protected\def#4##1{\letcsname#1##1\endcsname}%
+ \frozen\protected\def#5##1{\letcsname#1##1\endcsname\empty}}%
+% \stopinterface
+
+\permanent\protected\def\installdirectparametersethandler#1#2%
+ {\normalexpanded
+ {\mult_interfaces_install_direct_parameter_set_handler
+ {\noexpand#1}% \??aa
+ \expandafter\noexpand\csname set#2parameter\endcsname
+ \expandafter\noexpand\csname setexpanded#2parameter\endcsname
+ \expandafter\noexpand\csname let#2parameter\endcsname
+ \expandafter\noexpand\csname reset#2parameter\endcsname}}
+
+\aliased\let\installdirectstyleandcolorhandler\installstyleandcolorhandler
+
+\permanent\protected\def\installdirectcommandhandler#1#2%
+ {\installdirectparameterhandler {#1}{#2}%
+ \installdirectsetuphandler {#1}{#2}%
+ \installdirectparametersethandler {#1}{#2}%
+ \installdirectstyleandcolorhandler{#1}{#2}}
+
+\permanent\protected\def\installsetuponlycommandhandler#1#2%
+ {\installdirectparameterhandler{#1}{#2}%
+ \installdirectsetuphandler {#1}{#2}%
+ }% maybe \installdirectparametersethandler {#1}{#2}%
+
+% Experiment:
+
+% \installcorenamespace {one}
+% \installcorenamespace {two}
+%
+% \installcommandhandler \??one {one} \??one
+% \installcommandhandler \??two {two} \??two
+%
+% \defineone[test] \setupone[test][alpha=first]
+% \definetwo[test] \setuptwo[test][beta=second]
+%
+% \protect
+%
+% \def\currentone{test}
+% \def\currenttwo{test}
+%
+% \relateparameterhandlers {two} {test} {one} {test}
+%
+% yes:\oneparameter{alpha}\par
+% nop:\oneparameter{beta}\par
+% yes:\twoparameter{alpha}\par
+% yes:\twoparameter{beta}\par
+
+\permanent\protected\def\relateparameterhandlers#1#2#3#4% {from} {instance} {to} {instance}
+ {\immutable\edefcsname#1namespace\endcsname#2:\s!parent\endcsname{\csname#3namespace\endcsname#4}}
+
+\permanent\protected\def\relateparameterhandlersbyns#1#2#3#4% {from} {instance} {to} {instance}
+ {\edefcsname#1#2:\s!parent\endcsname{#3#4}}
+
+%D Here is another experiment:
+
+\protected\def\mult_interfaces_install_action_handler#1#2#3%
+ {\frozen\tolerant\protected\defcsname#1\endcsname[##1]##*[##2]%
+ {\begingroup
+ \ifarguments
+ \let#2\empty
+ \or
+ %\ifcondition\expandafter\mult_check_for_assignment_indeed_begin_\detokenize{##1}=^^^^0003^^^^0003^^^^0004%
+ % \ifcondition\mult_aux_no_assignment_indeed##1\ignorearguments
+ % \edef#2{##1}%
+ % \else
+ % \let#2\empty
+ % #3[##1]%
+ % \fi
+ \ifhastok={##1}%
+ \let#2\empty
+ #3[##1]%
+ \else
+ \edef#2{##1}%
+ \fi
+ \or
+ \edef#2{##1}%
+ #3[##2]%
+ \fi
+ \directsetup{handler:action:#1}%
+ \endgroup}}
+
+\permanent\protected\def\installactionhandler#1%
+ {\mutable\letcsname current#1\endcsname\empty
+ \normalexpanded
+ {\mult_interfaces_install_action_handler
+ {#1}%
+ \expandafter\noexpand\csname current#1\endcsname
+ \expandafter\noexpand\csname setupcurrent#1\endcsname}}
+
+% First we had, in tune with the regular system variables:
+%
+% \starttyping
+% \protected\def\installnamespace#1{\setvalue{????#1}{@@@@#1}}
+% \stoptyping
+%
+% The following variant is nicer and in principle faster but that gets unnoticed
+% unless lots of expansion happens. Also, we can use long tags but the internal
+% expansion will be relatively small (and unlikely more than 4 characters). For
+% instance, \??xx used to expand to @@xx but now becomes for instance 123::. This
+% is one character more but in quite some cases we had : after such a tag in the
+% old situation. In the new situation we create more namespaces and don't need that
+% : any more, so we end up with on the average the same amount of tokens and
+% definitely less when we consider cases like \??xx:\c!align: which now is just
+% \??somealign and therefore has length 5 now (instead of 4+1+5+1=10).
+%
+% Eventualy we will have a verbose \blablanamespace and the difference between core
+% and regular can go ... after all, \xxxparameter can already clash between the two
+% prefix groups .. if users use this mechanism a lot they should use verbose names
+% anyway (the old two character names were mostly an optimization as they also
+% expanded to these characters).
+
+% todo: register namespaces at lua end for logging and reverse resolve
+% todo: move this to syst-ini so that we can use it real early
+
+\newcount\c_mult_interfaces_n_of_namespaces
+
+\def\v_interfaces_prefix_template
+ {\number\c_mult_interfaces_n_of_namespaces>}
+
+\permanent\protected\def\installnamespace#1% for modules and users
+ {\ifcsname ????#1\endcsname
+ \writestatus\m!system{duplicate user namespace '#1'}\wait
+ \else
+ \global\advance\c_mult_interfaces_n_of_namespaces\plusone
+ \immutable\edefcsname ????#1\endcsname{\v_interfaces_prefix_template}%
+ \fi}
+
+\permanent\protected\def\installcorenamespace#1%
+ {\ifcsname ??#1\endcsname
+ \writestatus\m!system{duplicate core namespace '#1'}\wait
+ \else
+ \global\advance\c_mult_interfaces_n_of_namespaces\plusone
+ \immutable\edefcsname ??#1\endcsname{\v_interfaces_prefix_template}%
+ \clf_registernamespace\c_mult_interfaces_n_of_namespaces{#1}%
+ \fi}
+
+\def\mult_interfaces_get_parameters_error_indeed#1#2%
+ {\clf_showassignerror{#1}{#2}\inputlineno}
+
+% We install two core namespaces here, as we want nice error messages. Maybe
+% we will reserve the first 9.
+
+\installcorenamespace{fontinstanceready}
+\installcorenamespace{fontinstancebasic}
+\installcorenamespace{fontinstanceclass}
+
+%D The next one is handy for local assignments.
+
+\installcorenamespace{dummy}
+
+\letvalue\??dummy\empty
+
+\permanent \def\dummyparameter #1{\begincsname\??dummy#1\endcsname}
+\permanent \def\directdummyparameter #1{\begincsname\??dummy#1\endcsname}
+\permanent\protected\def\setdummyparameter #1{\defcsname\??dummy#1\endcsname}
+\permanent\protected\def\setexpandeddummyparameter#1{\edefcsname\??dummy#1\endcsname}
+\permanent\protected\def\letdummyparameter #1{\letcsname\??dummy#1\endcsname}
+
+\edef\mult_interfaces_dummy{\??dummy} % nor immutable
+
+\permanent\protected\def\getdummyparameters[#1%
+ {\if\noexpand#1]%
+ \expandafter\gobbleoneargument
+ \else
+ \let\m_mult_interfaces_namespace\mult_interfaces_dummy
+ \expandafter\mult_interfaces_get_parameters_indeed
+ \fi#1}
+
+\mult_interfaces_install_style_and_color_handler
+ \directdummyparameter
+ \usedummystyleandcolor
+ \usedummystyleparameter
+ \usedummycolorparameter
+
+% Maybe a \definecorenamespace[name][directparameter,directsetup][parent] but we
+% don't gain much. Actually we might just inline all definitions.
+
+% \enabletrackers[interfaces.namespaces,context.flush]
+%
+% \definenamespace
+% [xy]
+% [type=module,
+% comment=test module,
+% version=1,
+% name=test,
+% style=yes,
+% command=yes,
+% setup=list,
+% set=yes,
+% parent=xy]
+%
+% \unprotect
+% \getparameters
+% [\????xy]
+% [text=]
+% \protect
+%
+% \definetest[one]
+%
+% \starttext
+%
+% “\testparameter{text}”
+%
+% \setuptest[text=foo]
+%
+% “\testparameter{text}”
+%
+% \setuptest[one][text=bar]
+%
+% “\testparameter{text}”
+%
+% \stoptext
+%
+% This is a user (module) command:
+
+\permanent\tolerant\protected\def\definenamespace[#1]#*[#2]% namespace settings
+ {\clf_definenamespace{#1}{#2}}
+
+\permanent\protected\def\listnamespaces
+ {\clf_listnamespaces}
+
+%D Helper:
+%D
+%D \starttyping
+%D \showparentchain{@@am}{left}
+%D \stoptyping
+
+\permanent\protected\def\showparentchain#1#2%
+ {\writestatus\m!system{chain: [ \mult_interfaces_show_parent_chain{#1#2}]}}
+
+\def\mult_interfaces_show_parent_chain#1%
+ {#1 => %
+ \ifcsname#1:\s!parent\endcsname
+ \expandafter\mult_interfaces_show_parent_chain\lastnamedcs
+ \fi}
+
+%D Another helper (needs to be applied):
+
+\permanent\protected\def\doifelsecommandhandler#1#2% namespace name
+ {\ifcsname#1#2:\s!parent\endcsname
+ \expandafter\firstoftwoarguments
+ \else
+ \expandafter\secondoftwoarguments
+ \fi}
+
+\aliased\let\doifcommandhandlerelse\doifelsecommandhandler
+
+\permanent\protected\def\doifcommandhandler#1#2% namespace name
+ {\ifcsname#1#2:\s!parent\endcsname
+ \expandafter\firstofoneargument
+ \else
+ \expandafter\gobbleoneargument
+ \fi}
+
+\permanent\protected\def\doifnotcommandhandler#1#2% namespace name
+ {\ifcsname#1#2:\s!parent\endcsname
+ \expandafter\gobbleoneargument
+ \else
+ \expandafter\firstofoneargument
+ \fi}
+
+% another set of (fast) helpers (grep for usage):
+
+\permanent\def\expandnamespaceparameter#1#2#3% \??xx \getp \c!xx \v!yy
+ {\csname#1\ifcsname#1\expandafter\expandafter\expandafter\mult_aux_expand_namespace_parameter#2#3}
+
+\def\mult_aux_expand_namespace_parameter#1#2% \cs \v!yy
+ {#1\endcsname#1\else#2\fi\endcsname}
+
+\permanent\def\expandnamespacemacro#1#2#3% \??xx \some_edefed_cs \c!yy
+ {\csname#1\ifcsname#1#2\endcsname#2\else#3\fi\endcsname}
+
+\permanent\def\expandnamespacevalue#1#2% \??xx {...} \c!yy == optimized \expandcheckedcsname
+ {\csname#1\ifcsname#1\normalexpanded{\noexpand\syst_helpers_expand_checked_value{#2}}}
+
+\def\syst_helpers_expand_checked_value#1#2%
+ {#1\endcsname#1\else#2\fi\endcsname}
+
+%D Conventions:
+%D
+%D \starttyping
+%D \newcount \c_class_whatever
+%D \newconditional \c_class_whatever
+%D \newconstant \c_class_whatever
+%D \newdimen \d_class_whatever
+%D \newskip \s_class_whatever
+%D \newmuskip \s_class_whatever
+%D \newbox \b_class_whatever
+%D \newtoks \t_class_whatever
+%D
+%D \edef\p_class_whatever{\classparameter\c!whatever}
+%D \edef\m_class_whatever{whatever}
+%D \stoptyping
+
+% experiment: in principle this is faster but not that noticeable as we don't do that
+% many assignments and mechanism that do are also slow; the advantage is mostly nicer
+% in tracing
+
+\let\c_mult_set\relax
+
+\protected\def\mult_interfaces_install_definition_set#1#2#3#4#5#6#7%
+ {\newcount#3%
+ \let#6\empty
+ \protected\def#2%
+ {\expandafter\let\expandafter\c_mult_set\csname #1_t_#6\endcsname
+ \ifx\c_mult_set\relax
+ \expandafter\newtoks\c_mult_set
+ \letcsname#1_t_#6\endcsname\c_mult_set
+ \fi}
+ \frozen\protected\def#4##1%
+ {\pushmacro#6%
+ \advance#3\plusone
+ \edef#6{##1}%
+ \unprotect}%
+ \frozen\protected\def#5%
+ {\protect
+ \advance#3\minusone
+ \popmacro#6}%
+ \frozen\protected\def#7##1%
+ {\edef#6{##1}%
+ #2%
+ \the\c_mult_set\relax}}
+
+\permanent\protected\def\installdefinitionset#1#2%
+ {\normalexpanded
+ {\mult_interfaces_install_definition_set
+ {\noexpand#1}% \??aa
+ \expandafter\noexpand\csname set_#2_toks\endcsname
+ \expandafter\noexpand\csname #2_nesting_depth\endcsname
+ \expandafter\noexpand\csname push#2\endcsname
+ \expandafter\noexpand\csname pop#2\endcsname
+ \expandafter\noexpand\csname current#2\endcsname
+ \expandafter\noexpand\csname use#2\endcsname}}
+
+\protected\def\mult_interfaces_install_definition_set_member#1#2#3#4#5#6#7#8#9% no everysetups etc
+ {\let#5#2%
+ \frozen\protected\def#2%
+ {\ifcase#4\relax\expandafter#5\else\expandafter#6\fi}%
+ \tolerant\protected\def#6[##1]##*[##2]%
+ {\ifarguments\or
+ #3\toksapp\c_mult_set{#7[##1]}%
+ \or
+ #3\toksapp\c_mult_set{#8[##1][##2]}%
+ \fi}}
+
+\permanent\protected\def\installdefinitionsetmember#1#2#3#4%
+ {\normalexpanded
+ {\mult_interfaces_install_definition_set_member
+ {\noexpand#3}% \??aa
+ \expandafter\noexpand\csname setup#4\endcsname
+ \expandafter\noexpand\csname set_#2_toks\endcsname
+ \expandafter\noexpand\csname #2_nesting_depth\endcsname
+ \expandafter\noexpand\csname normal_setup_#4\endcsname
+ \expandafter\noexpand\csname delayed_setup_#4\endcsname
+ \expandafter\noexpand\csname setup#4_\s!single\endcsname
+ \expandafter\noexpand\csname setup#4_\s!double\endcsname}}
+
+%D Another experiment:
+
+\protected\def\mult_interfaces_install_parent_injector#1#2#3#4%
+ {\frozen\protected\def#4##1%
+ {\ifempty#3%
+ \defcsname#1#2:\s!parent\endcsname{#1##1}%
+ \fi}}
+
+\permanent\protected\def\installparentinjector#1#2%
+ {\normalexpanded{\mult_interfaces_install_parent_injector
+ {\noexpand#1}%
+ \expandafter\noexpand\csname current#2\endcsname
+ \expandafter\noexpand\csname current#2parent\endcsname
+ \expandafter\noexpand\csname inject#2parent\endcsname}}
+
+% The \LUA\ based variant is twice as fast as the above but as said, we don't use
+% this one that often. It's more about less tracing than speed here.
+
+\permanent\protected\def\installmacrostack#1%
+ {\ifdefined#1\else\mutable\let#1\empty\fi
+ \protected\gdefcsname push_macro_\csstring#1\endcsname{\localpushmacro#1}%
+ \protected\gdefcsname pop_macro_\csstring#1\endcsname{\localpopmacro #1}}
+
+\permanent\protected\def\installglobalmacrostack#1%
+ {\ifdefined#1\else\mutable\glet#1\empty\fi
+ \protected\gdefcsname push_macro_\csstring#1\endcsname{\globalpushmacro#1}%
+ \protected\gdefcsname pop_macro_\csstring#1\endcsname{\globalpopmacro #1}}
+
+% \showmacrostack can be used to see if there are different entries
+
+% \unprotect
+%
+% \installcorenamespace {test} \installcommandhandler \??test {test} \??test
+% \protected\def\TestMeA[#1]%
+% {\edef\currenttest{#1}
+% \edef\p_before{\testparameter\c!before}%
+% \ifx\p_before\empty \relax \else \relax \fi}
+% \protected\def\TestMeB[#1]%
+% {\edef\currenttest{#1}
+% \doifelsenothing{\testparameter\c!before}\relax\relax}
+% \protected\def\TestMeC[#1]%
+% {\edef\currenttest{#1}
+% \expandafter\expandafter\expandafter\ifx\testparameter\c!before\empty \relax \else \relax \fi}
+% \protected\def\TestMeD[#1]%
+% {\edef\currenttest{#1}
+% \doubleexpandafter\ifx\testparameter\c!before\empty \relax \else \relax \fi}
+%
+% \protect
+%
+% \starttext
+% \definetest[foo] \definetest[bar][foo] \setuptest[bar][before=indeed]
+% \testfeatureonce{100000}{\TestMeA[bar]} A:\elapsedtime \par % 0.502
+% \testfeatureonce{100000}{\TestMeB[bar]} B:\elapsedtime \par % 0.530
+% \testfeatureonce{100000}{\TestMeC[bar]} C:\elapsedtime \par % 0.487
+% \testfeatureonce{100000}{\TestMeD[bar]} D:\elapsedtime \par % 0.493
+% \stoptext
+
+% There is no real demand for this ... even if this is two to three times as fast we
+% only gain a few milliseconds:
+%
+% \starttyping
+% \protected\def\foo#1{[foo:#1]}
+%
+% \installcommalistprocessor {foo} \foo
+% \installcommalistprocessorcommand \processfoolist \foo
+%
+% \infofont
+%
+% \commalistprocessor{foo}[a,b,c,{x,y,z},d]\par
+% \processfoolist[a, b, c, {x,y,z}, d]\par
+% \processcommalist[{x,y,z}]\foo\blank
+%
+% \commalistprocessor{foo}[{x,y,z},a]\par
+% \commalistprocessor{foo}[{x,y,z}]\par
+% \processfoolist[{x,y,z},a]\par
+% \processfoolist[{x,y,z}]\par
+% \processcommalist[{x,y,z}]\foo\blank
+%
+% \protected\def\foo#1{}
+%
+% \testfeatureonce{400000}{\processfoolist [fixed,middle,bar]} \elapsedtime\quad
+%%\testfeatureonce{400000}{\commalistprocessor{foo}[fixed,middle,bar]} \elapsedtime\quad
+% \testfeatureonce{400000}{\processcommalist [fixed,middle,bar]\foo} \elapsedtime\quad
+% \stoptyping
+%
+% For instance the luatex manual only has some 3000 calls. But I keep this around as one
+% never knows when we might need it.
+
+\installcorenamespace{commalistprocessor}
+\installcorenamespace{commalistprocessorwrap}
+\installcorenamespace{commalistprocessorfirst}
+\installcorenamespace{commalistprocessornext}
+\installcorenamespace{commalistprocessoraction}
+
+\permanent\protected\def\installcommalistprocessor#1#2% 5 macro names overhead
+ {\protected\edefcsname\??commalistprocessor#1\endcsname[%
+ {\csname\??commalistprocessorwrap#1\endcsname\relax}% \relax preserves {}
+ \protected\edefcsname\??commalistprocessorwrap#1\endcsname##1]%
+ {\csname\??commalistprocessorfirst#1\endcsname##1,]}
+ \protected\edefcsname\??commalistprocessorfirst#1\endcsname\relax
+ {\csname\??commalistprocessornext#1\endcsname}%
+ \protected\edefcsname\??commalistprocessornext#1\endcsname
+ {\noexpand\futureexpandis]%
+ \noexpand\gobbleoneargument
+ \csname\??commalistprocessoraction#1\endcsname}
+ \protected\edefcsname\??commalistprocessoraction#1\endcsname##1,%
+ {\noexpand#2{##1}%
+ \csname\??commalistprocessornext#1\endcsname}}
+
+\permanent\protected\def\installcommalistprocessorcommand#1#2% \processor \action
+ {\edef\p_name{\csstring#2}%
+ \installcommalistprocessor\p_name{#2}%
+ \expandafter\let\expandafter#1\csname\??commalistprocessor\p_name\endcsname}
+
+\permanent\protected\def\commalistprocessor#1{\csname\??commalistprocessor#1\endcsname}
+
+\protect \endinput