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%D \module
%D [ file=symb-ini,
%D version=1998.07.20,
%D title=\CONTEXT\ Symbol Libraries,
%D subtitle=Basic Symbols Commands,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%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 The macros described here used to be part of the \type
%D {core-con} module. I decided to move them here when
%D symbolsets saw the light. Let their light shine.
\writestatus{loading}{ConTeXt Symbol Libraries / Initialization}
\unprotect
%D \macros
%D {definesymbol, symbol}
%D
%D Converting numbers or levels into a character, romannumeral,
%D symbol or something else, is supported by many \CONTEXT\
%D commands. Therefore we need a mechanism for linking such
%D numbers to their counterparts.
%D
%D First we take care of symbols. These are for instance used
%D in enumerations and itemizations. We have:
%D
%D \showsetup{definesymbol}
%D \showsetup{symbol}
%D
%D Symbols are simply linked to a tag. Such tags can be numbers
%D or strings.
%D
%D \starttyping
%D \definesymbol [1] [$\bullet$]
%D \definesymbol [level 5] [$\star$]
%D \stoptyping
% ss:tag -> symbol
% ss:set:tag -> symbol out of set
% sstag -> list of symbols in set
\def\definesymbol
{\dotripleempty\dodefinesymbol}
% \def\dodefinesymbol[#1][#2][#3]% class name meaning
% {\ifthirdargument
% \setvalue{\??ss:#1:#2}{#3}%
% \doifsomething{#1}{\addvalue{\??ss*#1}{#2}}%
% \else
% \setvalue{\??ss:\currentsymboldef:#1}{#2}%
% \fi}
\def\dodefinesymbol[#1][#2][#3]% class name meaning
{\ifthirdargument
\setvalue{\??ss:#1:#2}{#3}%
\doifsomething{#1}{\addvalue{\??ss*#1}{#2}}%
\else
\setvalue{\??ss:\currentsymboldef:#1}{#2}%
\addvalue{\??ss*\currentsymboldef}{#1}%
\fi}
\def\doifinsymbolsetelse#1#2{\doifdefinedelse{\??ss:#1:#2}}
\def\doifinsymbolset #1#2{\doifdefined {\??ss:#1:#2}}
\def\doifsymbolsetelse #1{\doifdefinedelse{\??ss*#1}}
\def\symbolset#1{\executeifdefined{\??ss*#1}\empty} % no [#1], to be used in commalists etc
%D Since symbols are used frequently in interactive
%D documents, we speed up this one. Well, that was history,
%D since now we simplified things a bit, because the low
%D level macros have been sped up now and then.
\unexpanded\def\symbol % This one always gobbles spaces,
{\dodoubleempty\dosymbol} % so never change it again!
\newif\ifnosymbol \newtoks\everysymbol
\def\dodosymbol#1#2% \relax's prevent lookahead problems
{\nosymbolfalse{\the\everysymbol\csname\??ss:#1:#2\endcsname\relax}\relax}
\def\directsymbol#1#2% no \relax, there can be an argument, see lists
{\executeifdefined{\??ss:#1:#2}\firstofoneargument}
% We support both:
%
% Test test \symbol[whatever]\ test \symbol[whatever].
% Test test \symbol{whatever} test \symbol{whatever}.
\def\dosymbol % so we also handle \symbol{name}
{\iffirstargument % which is nicer with following spaces
\expandafter\donormalsymbol
\else
\expandafter\dospecialsymbol
\fi}
\def\dospecialsymbol[#1][#2]#3%
{\firstargumenttrue
\secondargumentfalse
\donormalsymbol[#3][]}
\def\donormalsymbol[#1][#2]%
{\nosymboltrue
\ifsecondargument
\edef\currentsymbol{#2}%
\doifinsymbolset{#1}{#2}{\dodosymbol{#1}{#2}}%
\else
\edef\currentsymbol{#1}%
\fi
\ifnosymbol
\the\symbolsetups
\ifnosymbol
\redosymbol\currentsymbol
\fi
\fi}
\def\fetchsymbol#1%
{\ifnosymbol
\doifinsymbolset{#1}\currentsymbol{\dodosymbol{#1}\currentsymbol}%
\fi}
\def\redosymbol#1%
% {\doifinsymbolsetelse\empty{#1}{\dodosymbol\empty{#1}}{#1}} % more efficient:
{\doifinsymbolsetelse\empty{#1}{\dodosymbol\empty}\firstofoneargument{#1}}
% % % % %
% this should go in symb-fig, to be loaded after core-fig
%D \macros
%D {definefiguresymbol}
%D
%D To simplify defining figure symbols, we offer:
%D
%D \showsetup{definefiguresymbol}
%D
%D By default, such symbols scale along the current bodyfont
%D size or running font size (which is better).
\def\defaultsymbolfactor{10}
\def\defaultsymbolheight{1.25ex}
\def\figuresymbol
{\dodoubleempty\dofiguresymbol}
\ifx\externalfigure \undefined \def\externalfigure[#1][#2]{#1} \fi
\ifx\resetexternalfigures\undefined \let\resetexternalfigures\relax \fi
\def\dofiguresymbol[#1][% #2]%
{\externalfigure[#1][\c!reset=\v!yes,\c!symbol=\v!yes,\c!height=\defaultsymbolheight,}% #2]}
\appendtoks \resetexternalfigures \to \everysymbol
\def\definefiguresymbol
{\dotripleempty\dodefinefiguresymbol}
\def\dodefinefiguresymbol[#1][#2][#3]%
{\ifsecondargument
\definesymbol[#1][{\dofiguresymbol[#2][#3]}]%
\fi}
% but for the moment we keep it here
% % % % % %
%\def\objectsymbol[#1]%
% {\dopresetfieldsymbol{#1}\dogetfieldsymbol{#1}}
%D \macros
%D {doifsymboldefinedelse}
%D
%D A handy private one:
% a bit messy
\def\xfetchsymbol#1%
{\ifnosymbol
\doifinsymbolset{#1}\currentsymbol\nosymbolfalse
\fi}
\def\xredosymbol#1%
{\doifinsymbolset\empty\currentsymbol\nosymbolfalse}
\def\doifsymboldefinedelse#1%
{\bgroup
\edef\currentsymbol{#1}%
\let\fetchsymbol\xfetchsymbol
\nosymboltrue
\the\symbolsetups
\ifnosymbol
\xredosymbol\currentsymbol
\ifnosymbol
\egroup\@EAEAEA\secondoftwoarguments
\else
\egroup\@EAEAEA\firstoftwoarguments
\fi
\else
\egroup\@EA\firstoftwoarguments
\fi}
%D \macros
%D {setupsymbolset,startsymbolset}
%D
%D From these macro definitions one can deduce that symbols can
%D be grouped in symbol sets:
%D
%D \starttyping
%D \startsymbolset [navigation 1]
%D \definefiguresymbol [Next] [mp-symb.1]
%D \definefiguresymbol [Prev] [mp-symb.2]
%D \stopsymbolset
%D \stoptyping
%D
%D Such a symbol can be typeset with:
%D
%D \starttyping
%D \setupsymbolset[navigation 1]\symbol[Next]
%D \stoptyping
%D
%D or simply:
%D
%D \starttyping
%D \symbol[navigation 1][Next]
%D \stoptyping
%D
%D Formally:
%D
%D \showsetup{setupsymbolset}
%D \showsetup{startsymbolset}
\let\currentsymboldef\empty
\def\startsymbolset[#1]%
{\def\currentsymboldef{#1}}
\def\stopsymbolset
{\let\currentsymboldef\empty}
\newtoks\symbolsetups
\def\setupsymbolset[#1]%
{\prependtoksonce\fetchsymbol{#1}\to\symbolsetups}
\def\resetsymbolset
{\symbolsetups\emptytoks}
\def\forcesymbolset[#1]%
{\symbolsetups{\fetchsymbol{#1}}}
%D \macros
%D {showsymbolset}
%D
%D \showsetup{showsymbolset}
\fetchruntimecommand \showsymbolset {\f!symbolprefix\s!run}
%D \macros
%D {usesymbols}
%D
%D \showsetup{usesymbols}
\def\dousesymbols#1%
{\startreadingfile
\readsysfile{\truefilename{\f!symbolprefix#1}.\mksuffix}
{\showmessage\m!symbols1{#1}}
{\readsysfile{\truefilename{\f!symbolprefix#1}}
{\showmessage\m!symbols1{#1}}
\donothing}%
\stopreadingfile}
\def\usesymbols[#1]%
{\processcommalist[#1]\dousesymbols}
%D As longs as symbols are linked to levels or numbers, we can
%D also use the conversion mechanism, but in for instance the
%D itemization macros, we prefer symbols because they can more
%D easier be (partially) redefined.
\protect \endinput
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