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+%D \module
+%D [ file=font-sty,
+%D version=2011.01.13, % (copied fron font-ini)
+%D title=\CONTEXT\ Font Macros,
+%D subtitle=Styles,
+%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 Font Macros / Styles}
+
+\unprotect
+
+%D \macros
+%D {definealternativestyle}
+%D
+%D In the main modules we are going to implement lots of
+%D parameterized commands and one of these parameters will
+%D concern the font to use. To suit consistent use of fonts we
+%D here implement a mechanism for defining the keywords that
+%D present a particular style or alternative.
+%D
+%D \starttyping
+%D \definealternativestyle [keywords] [\style] [\nostyle]
+%D \stoptyping
+%D
+%D The first command is used in the normal textflow, while the
+%D second command takes care of headings and alike. Consider
+%D the next two definitions:
+%D
+%D \starttyping
+%D \definealternativestyle [bold] [\bf] []
+%D \definealternativestyle [cap] [\cap] [\cap]
+%D \stoptyping
+%D
+%D A change \type{\bf} in a heading which is to be set in
+%D \type{\tfd} does not look that well, so therefore we leave
+%D the second argument of \type{\definealternativestyle} empty.
+%D When we capatalize characters using the pseudo small cap
+%D command \type{\cap}, we want this to take effect in both
+%D text and headings, which is accomplished by assigning both
+%D arguments.
+
+\installcorenamespace{alternativestyles}
+
+\setnewconstant \c_font_current_alternative_style_index \plusone
+
+\unexpanded\def\definealternativestyle
+ {\dotripleempty\font_basics_define_alternative_style}
+
+\def\font_basics_define_alternative_style[#commands][#variantone][#varianttwo]%
+ {\processcommalist[#commands]{\font_basics_define_alternative_style_indeed{#variantone}{#varianttwo}}}
+
+\let\definestyle\definealternativestyle % later redefined
+
+\def\font_basics_define_alternative_style_indeed#variantone#varianttwo#command%
+ {\ifcsname#command\endcsname
+ % no redefinition
+ \else
+ \setuvalue{#command}{\groupedcommand{#variantone}{}}%
+ \fi
+ \setvalue{\??alternativestyles#command}{\font_helpers_apply_alternative_style{#variantone}{#varianttwo}}}%
+
+\def\font_helpers_apply_alternative_style
+ {\ifcase\c_font_current_alternative_style_index
+ \expandafter\gobbletwoarguments
+ \or
+ \expandafter\firstoftwoarguments
+ \or
+ \expandafter\secondoftwoarguments
+ \else
+ \expandafter\firstoftwoarguments
+ \fi}
+
+\def\applyalternativestyle#name% public
+ {\begincsname\??alternativestyles#name\endcsname}
+
+%D Maybe too geneneric, but probably ok is the following. (Maybe one
+%D day we will use a dedicated grouped command for styles.)
+
+% \appendtoks
+% \let\groupedcommand\thirdofthreearguments
+% \to \everysimplifycommands
+
+%D This command also defines the keyword as command. This means
+%D that the example definition of \type{bold} we gave before,
+%D results in a command \type{\bold} which can be used as:
+%D
+%D \startbuffer
+%D He's a \bold{bold} man with a {\bold head}.
+%D \stopbuffer
+%D
+%D \typebuffer
+%D
+%D or
+%D
+%D \startexample
+%D \definealternativestyle[bold][\bf][]\getbuffer
+%D \stopexample
+%D
+%D Such definitions are of course unwanted for \type{\cap}
+%D because this would result in an endless recursive call.
+%D Therefore we check on the existance of both the command and
+%D the substitution. The latter is needed because for instance
+%D \type{\type} is an entirely diferent command. That command
+%D handles verbatim, while the style command would just switch
+%D to teletype font. This is just an example of a tricky
+%D naming coincidence.
+
+%D \macros
+%D {doconvertfont,noconvertfont,
+%D dontconvertfont,redoconvertfont}
+%D
+%D After having defined such keywords, we can call for them by
+%D using
+%D
+%D \starttyping
+%D \doconvertfont{keyword}{text}
+%D \stoptyping
+%D
+%D We deliberately pass an argument. This enables us to
+%D assign converters that handle one argument, like
+%D \type{\cap}.
+%D
+%D By default the first specification is used to set the style,
+%D exept when we say \type{\dontconvertfont}, after which the
+%D second specification is used. We can also directly call for
+%D \type{\noconvertfont}. In nested calls, we can restore the
+%D conversion by saying \type{\redoconvertfont}.
+
+%D These commands are not grouped! Grouping is most probably
+%D done by the calling macro's and would lead to unnecessary
+%D overhead.
+
+\let\m_current_convert_font \empty
+\let\m_current_convert_font_dt\empty
+
+\unexpanded\def\doconvertfont#specification% takes second argument / this command is obsolete
+ {\edef\m_current_convert_font{#specification}%
+ \ifx\m_current_convert_font\empty
+ %\expandafter\firstofoneargument
+ \else
+ \expandafter\font_helpers_do_convert_font
+ \fi}
+
+\def\font_helpers_do_convert_font
+ {\edef\m_current_convert_font_dt{\detokenize\expandafter{\m_current_convert_font}}%
+ \ifcsname\??alternativestyles\m_current_convert_font_dt\endcsname
+ \expandafter\lastnamedcs
+ \else\ifcsname\m_current_convert_font_dt\endcsname
+ \doubleexpandafter\lastnamedcs
+ \else
+ \doubleexpandafter\m_current_convert_font
+ \fi\fi}
+
+%D Low level switches (downward compatible, but we keep them as one can use
+%D them in styles):
+%D
+%D \starttyping
+%D \usemodule[abr-02]
+%D \setuphead[chapter][style=\bfb]
+%D \setupfooter[style=\dontconvertfont\bf]
+%D \chapter{This is \TEX}
+%D \stoptyping
+
+\unexpanded\def\dontconvertfont{\c_font_current_alternative_style_index\plustwo} % needs checking in usage
+\unexpanded\def\redoconvertfont{\c_font_current_alternative_style_index\plusone} % needs checking in usage
+
+%D The new one:
+
+\setfalse\fontattributeisset
+
+\unexpanded\def\dousestyleparameter#value%
+ {\edef\currentstyleparameter{#value}%
+ \ifx\currentstyleparameter\empty\else
+ \expandafter\dousecurrentstyleparameter
+ \fi}
+
+\unexpanded\def\dousestylehashparameter#hash#parameter%
+ {\ifcsname#hash#parameter\endcsname
+ \expandafter\dousestyleparameter\lastnamedcs
+ \fi}
+
+\unexpanded\def\dousecurrentstyleparameter % empty check outside here
+ {\edef\detokenizedstyleparameter{\detokenize\expandafter{\currentstyleparameter}}%
+ \settrue\fontattributeisset % reset is done elsewhere
+ \ifcsname\??alternativestyles\detokenizedstyleparameter\endcsname
+ \lastnamedcs
+ \else\ifcsname\detokenizedstyleparameter\endcsname
+ \lastnamedcs
+ \else
+ \currentstyleparameter
+ \fi\fi}
+
+\let\dosetfontattribute\dousestylehashparameter % for a while
+
+%D New commands (not yet interfaced):
+%D
+%D \startbuffer
+%D \definestyle[one][style=bold,color=darkblue]
+%D
+%D test \one{test} test
+%D test \style[one]{test} test
+%D test \style[color=red]{test} test
+%D test \style[Serif at 20pt]{test} test
+%D \stopbuffer
+%D
+%D \typebuffer \startlines \getbuffer \stoplines
+
+% definitions .. no tagging here
+
+\installcorenamespace{style}
+\installcorenamespace{stylecheck}
+
+\installcommandhandler \??style {style} \??style
+
+\setupstyle
+ [%\c!style=,
+ %\c!color=,
+ \c!method=\v!command]
+
+\appendtoks
+ \letvalue{\??stylecheck\currentstyle}\relax
+ \edef\p_method{\styleparameter\c!method}%
+ \ifx\p_method\v!command
+ \setuevalue{\e!start\currentstyle}{\font_styles_apply_start{\currentstyle}}%
+ \setuevalue{\e!stop \currentstyle}{\font_styles_apply_stop}%
+ \setuevalue {\currentstyle}{\font_styles_apply_grouped{\currentstyle}}% no longer groupedcommand here
+ \fi
+\to \everydefinestyle
+
+\unexpanded\def\font_styles_apply_start#name%
+ {\begingroup
+ \font_styles_use_defined{#name}}
+
+\unexpanded\def\font_styles_apply_stop
+ {\endgroup}
+
+\unexpanded\def\font_styles_apply_grouped#name% assumes that the next is { or \bgroup
+ {\bgroup
+ \def\g_style{\font_styles_use_defined{#name}}%
+ \afterassignment\g_style
+ \let\nexttoken}
+
+\unexpanded\def\font_styles_use_defined#name%
+ {\edef\currentstyle{#name}%
+ \usestylestyleandcolor\c!style\c!color}
+
+\unexpanded\def\font_styles_use_generic#specification%
+ {\let\currentstyle\s!unknown % reasonable generic tag
+ \letstyleparameter\c!style\empty
+ \letstyleparameter\c!color\empty
+ \setupcurrentstyle[#specification]%
+ \usestylestyleandcolor\c!style\c!color}
+
+% commands
+
+\installcorenamespace{styleargument}
+
+\unexpanded\def\style[#name]% as this is can be a switch we use groupedcommand
+ {\csname\??styleargument
+ \ifcsname\??stylecheck#name\endcsname
+ 2% defined as style
+ \else\ifcsname#name\endcsname
+ 1% defined as command
+ \else
+ 3% specification
+ \fi\fi
+ \endcsname{#name}}
+
+\setvalue{\??styleargument1}#name%
+ {\groupedcommand{\csname#name\endcsname}{}}
+
+\setvalue{\??styleargument2}#name%
+ {\groupedcommand{\font_styles_use_defined{#name}}{}} % or {\font_styles_apply_grouped{#name}}
+
+\setvalue{\??styleargument3}#specification%
+ {\doifelseassignment{#specification}\font_styles_assignment\font_styles_direct{#specification}}
+
+\def\font_styles_assignment#specification{\groupedcommand{\font_styles_use_generic{#specification}}{}}
+\def\font_styles_direct #specification{\groupedcommand{\definedfont[#specification]}{}}
+
+% environments
+
+\installcorenamespace{styleenvironment}
+
+\unexpanded\def\startstyle[#name]%
+ {\begingroup
+ \csname\??styleenvironment
+ \ifcsname\??stylecheck#name\endcsname
+ 2% defined as style
+ \else\ifcsname#name\endcsname
+ 1% defined as command
+ \else
+ 3% specification
+ \fi\fi
+ \endcsname{#name}}
+
+\unexpanded\def\stopstyle
+ {\endgroup
+ \autoinsertnextspace} % will be configurable, maybe also in \definestartstop
+
+\setvalue{\??styleenvironment1}#name%
+ {\csname#name\endcsname}
+
+\setvalue{\??styleenvironment2}#name%
+ {\font_styles_use_defined{#name}}
+
+\setvalue{\??styleenvironment3}#specification%
+ {\doifelseassignment{#specification}\font_styles_start_assignment\font_styles_start_direct{#specification}}
+
+\def\font_styles_start_assignment#specification{\font_styles_use_generic{#specification}}
+\def\font_styles_start_direct #specification{\definedfont[#specification]\relax}
+
+%D Still experimental (might even go away).
+
+% \definestylecollection[mine]
+
+% \definestyleinstance[mine][default][sorry]
+% \definestyleinstance[mine][tt][bs][ttbs:\rm\sl]
+% \definestyleinstance[mine][tt][bf][ttbf:\rm\sl]
+% \definestyleinstance[mine][bf][\sl]
+% \definestyleinstance[mine][sl][\tt]
+
+% {\bf test \mine test \sl test \mine test \bs oeps \mine oeps {\tt test \mine \bf test}}
+
+\installcorenamespace{stylecollection}
+
+\unexpanded\def\definestylecollection
+ {\dosingleargument\font_styles_define_style_collection}
+
+\def\font_styles_define_style_collection[#name]%
+ {\iffirstargument
+ \setuvalue{#name}{\styleinstance[#name]}%
+ \def\font_styles_define_style_collection_a#style%
+ {\def\font_styles_define_style_collection_b#alternative{\undefinevalue{\??stylecollection#name:#style:#alternative}}%
+ \font_helpers_process_alternative_list\font_styles_define_style_collection_b
+ \font_styles_define_style_collection_b\s!default}%
+ \font_helpers_process_style_list\font_styles_define_style_collection_a
+ \font_styles_define_style_collection_a\s!default
+ \fi}
+
+\let\font_styles_define_style_collection_a\relax
+\let\font_styles_define_style_collection_b\relax
+
+\unexpanded\def\definestyleinstance
+ {\doquadrupleargument\font_styles_define_style_instance}
+
+\def\font_styles_define_style_instance[#instance][#2][#3][#4]% [name] [rm|ss|tt|..] [sl|bf|...] [whatever]
+ {\iffirstargument
+ \ifcsname#instance\endcsname\else\font_styles_define_style_collection[#instance]\fi
+ \fi
+ \iffourthargument
+ \setvalue{\??stylecollection#instance:#2:#3}{#4}%
+ \else\ifthirdargument
+ \setvalue{\??stylecollection#instance::#2}{#3}%
+ \else\ifsecondargument
+ \letvalueempty{\??stylecollection#instance::#2}%
+ \fi\fi\fi}
+
+% \unexpanded\def\styleinstance[#instance]% will be made faster
+% {%\begingroup\normalexpanded{\noexpand\infofont[#1:\fontstyle:\fontalternative]}\endgroup
+% \executeifdefined{\??stylecollection#instance:\fontstyle:\fontalternative}%
+% {\executeifdefined{\??stylecollection#instance:\fontstyle:\s!default}%
+% {\executeifdefined{\??stylecollection#instance::\fontalternative}
+% {\getvalue {\??stylecollection#instance::\s!default}}}}}
+
+\unexpanded\def\styleinstance[#instance]% maybe \lastnamedcs here too
+ {\csname\??stylecollection#instance:%
+ \ifcsname\??stylecollection#instance:\fontstyle:\fontalternative\endcsname
+ \fontstyle:\fontalternative
+ \else\ifcsname\??stylecollection#instance:\fontstyle:\s!default\endcsname
+ \fontstyle:\s!default
+ \else\ifcsname\??stylecollection#instance::\fontalternative\endcsname
+ :\fontalternative
+ \else
+ :\s!default
+ \fi\fi\fi
+ \endcsname}
+
+%D Variant selectors
+%D
+%D \starttyping
+%D \mathematics {\vsone{\utfchar{0x2229}}}
+%D \mathematics {\utfchar{0x2229}\vsone{}}
+%D \stoptyping
+
+\unexpanded\edef\vsone#character{#character\normalUchar"FE00 } % used
+\unexpanded\edef\vstwo#character{#character\normalUchar"FE01 } % not used but handy for testing
+
+%D For historic reasons we keep the following around but they are no longer
+%D that relevant for \MKIV.
+
+\unexpanded\def\doattributes#1#2#3#4%
+ {\begingroup % geen \bgroup, anders in mathmode lege \hbox
+ \dousestylehashparameter{#1}{#2}%
+ \dousecolorhashparameter{#1}{#3}%
+ #4%
+ \endgroup}
+
+\unexpanded\def\dostartattributes#1#2#3%
+ {\begingroup % geen \bgroup, anders in mathmode lege \hbox
+ \dousestylehashparameter{#1}{#2}%
+ \dousecolorhashparameter{#1}{#3}}
+
+\let\dostopattributes\endgroup
+
+\protect \endinput