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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 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 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}
\registerctxluafile{symb-ini}{1.001}
\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
\installcorenamespace{symbol}
\installcorenamespace{symbolset}
\let\currentsymbol \empty
\let\currentsymbolset\empty
\newtoks\t_symb_setups
\let\m_symb_current_set\empty
\newconditional\c_symb_found
\newtoks\everysymbol
%D We don't use the commandhandler as symbols have their own
%D subsystem for resolving values.
\unexpanded\def\definesymbol
{\dotripleempty\symb_define}
\def\symb_define[#1][#2][#3]% class name meaning
{\ifthirdargument
\setvalue{\??symbol#1:#2}{#3}%
\doifsomething{#1}{\addvalue{\??symbolset#1}{#2}}%
\else
\setvalue{\??symbol\m_symb_current_set:#1}{#2}%
\addvalue{\??symbolset\m_symb_current_set}{#1}%
\fi}
\letvalue{\??symbolset}\empty
\unexpanded\def\doifinsymbolsetelse#1#2{\ifcsname\??symbol#1:#2\endcsname\expandafter\firstoftwoarguments\else\expandafter\secondoftwoarguments\fi}
\unexpanded\def\doifinsymbolset #1#2{\ifcsname\??symbol#1:#2\endcsname\expandafter\firstofoneargument \else\expandafter\gobbleoneargument \fi}
\unexpanded\def\doifsymbolsetelse #1{\ifcsname\??symbolset#1\endcsname\expandafter\firstoftwoarguments\else\expandafter\secondoftwoarguments\fi}
\def\symbolset#1{\csname\??symbolset\ifcsname\??symbolset#1\endcsname#1\fi\endcsname} % 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 every now and then.
% We support both:
%
% Test test \symbol[whatever]\ test \symbol[whatever].
% Test test \symbol{whatever} test \symbol{whatever}.
\unexpanded\def\symbol % This one always gobbles spaces,
{\dodoubleempty\symb_place} % so never change it again!
\def\symb_place % so we also handle \symbol{name}
{\iffirstargument % which is nicer with following spaces
\expandafter\symb_place_normal
\else
\expandafter\symb_place_special
\fi}
\def\symb_place_normal
{\ifsecondargument
\expandafter\symb_place_normal_a
\else
\expandafter\symb_place_normal_b
\fi}
\def\symb_place_normal_a[#1][#2]%
{\edef\currentsymbol{#2}%
\ifcsname\??symbol#1:#2\endcsname
\symb_place_indeed{#1:#2}%
\else
\symb_place_normal_c
\fi}
\def\symb_place_normal_b[#1][#2]%
{\edef\currentsymbol{#1}%
\ifcsname\??symbol\currentsymbolset:#1\endcsname
\symb_place_indeed{\currentsymbolset:#1}%
\else
\symb_place_normal_c
\fi}
\def\symb_place_normal_c
{\setfalse\c_symb_found
\the\t_symb_setups
\ifconditional\c_symb_found \else
\symb_place_retry\currentsymbol % hm, isn't this redundant?
\fi}
\def\symb_place_special[#1][#2]#3%
{\firstargumenttrue
\secondargumentfalse
\symb_place_normal[#3][]}
\def\symb_place_indeed#1% \relax's prevent lookahead problems
{\settrue\c_symb_found
\begingroup
\the\everysymbol
\csname\??symbol#1\endcsname\relax
\endgroup}
\letvalue{\??symbol}\firstofoneargument
\def\directsymbol#1#2% no \relax, there can be an argument, see lists
{\csname\??symbol\ifcsname\??symbol#1:#2\endcsname#1:#2\fi\endcsname}
\unexpanded\def\symb_fetch
{\ifconditional\c_symb_found
\expandafter\gobbleoneargument
\else
\expandafter\symb_fetch_indeed
\fi}
\def\symb_fetch_indeed#1%
{\ifcsname\??symbol#1:\currentsymbol\endcsname
\symb_place_indeed{#1:\currentsymbol}%
\fi}
\def\symb_place_retry#1%
{\ifcsname\??symbol:#1\endcsname
\symb_place_indeed{:#1}%
\else
#1%
\fi}
%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}
\unexpanded\def\figuresymbol
{\dodoubleempty\symb_figure}
\ifdefined\externalfigure \else \def\externalfigure[#1][#2]{#1} \fi
\ifdefined\resetexternalfigures \else \let\resetexternalfigures\relax \fi
\def\symb_figure[#1][% #2]%
{\externalfigure[#1][\c!reset=\v!yes,\c!symbol=\v!yes,\c!height=\defaultsymbolheight,}% #2]}
\appendtoks \resetexternalfigures \to \everysymbol
\unexpanded\def\definefiguresymbol
{\dotripleempty\symb_figure_define}
\def\symb_figure_define[#1][#2][#3]%
{\ifsecondargument
\definesymbol[#1][{\symb_figure[#2][#3]}]%
\fi}
%D \macros
%D {doifsymboldefinedelse}
%D
%D A handy private one:
\def\symb_fetch_first
{\ifconditional\c_symb_found
\expandafter\gobbleoneargument
\else
\expandafter\symb_fetch_first_indeed
\fi}
\def\symb_fetch_first_indeed#1%
{\doifinsymbolset{#1}\currentsymbol{\settrue\c_symb_found}}
\def\symb_fetch_second#1%
{\doifinsymbolset\empty\currentsymbol{\settrue\c_symb_found}}
\def\doifsymboldefinedelse#1%
{\begingroup
\edef\currentsymbol{#1}%
\let\symb_fetch\symb_fetch_first
\setfalse\c_symb_found
\the\t_symb_setups
\ifconditional\c_symb_found
\endgroup\expandafter\firstoftwoarguments
\else
\symb_fetch_second\currentsymbol
\ifconditional\c_symb_found
\endgroup\doubleexpandafter\firstoftwoarguments
\else
\endgroup\doubleexpandafter\secondoftwoarguments
\fi
\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}
\installcorenamespace{symbolsets}
\unexpanded\def\startsymbolset[#1]%
{\pushmacro\m_symb_current_set
\def\m_symb_current_set{#1}}
\unexpanded\def\stopsymbolset
{\popmacro\m_symb_current_set}
\unexpanded\def\setupsymbolset[#1]%
{\edef\currentsymbolset{#1}%
\ifcsname\??symbolsets\currentsymbolset\endcsname \else
\symb_setup_symbol_set
\fi}
\def\symb_setup_symbol_set
{\normalexpanded{\t_symb_setups{\symb_fetch{\currentsymbolset}\the\t_symb_setups}}%
\letvalue{\??symbolsets\currentsymbolset}\empty} % speedup
\unexpanded\def\resetsymbolset
{\t_symb_setups\emptytoks}
\unexpanded\def\forcesymbolset[#1]%
{\t_symb_setups{\symb_fetch{#1}}}
%D \macros
%D {showsymbolset}
%D
%D \showsetup{showsymbolset}
\fetchruntimecommand \showsymbolset {\f!symbolprefix\s!run}
%D \macros
%D {usesymbols}
%D
%D \showsetup{usesymbols}
\unexpanded\def\usesymbols[#1]{\ctxcommand{usesymbols("#1")}}
%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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