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%D \module
%D [ file=font-emp,
%D version=20120106, % (moved from font-ini)
%D title=\CONTEXT\ Font Macros,
%D subtitle=Emphasis,
%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 / Emphasis}
\unprotect
%D \macros
%D {em,emphasistypeface,emphasisboldface}
%D
%D The next macro started as a copy of Donald Arseneau's \type {\em} (\TUGNEWS\
%D Vol.~3, no.~1, 1994). His implementation was a bit more sophisticated version of
%D the standard \LATEX\ one. We further enhanced the macro, so now it also adapts
%D itself to boldface mode. Because we favor {\sl slanted} type over {\it italic},
%D we made the emphasis adaptable, for instance:
%D
%D \starttyping
%D \def\emphasistypeface {\it}
%D \def\emphasisboldface {\bi}
%D \stoptyping
%D
%D But we prefer:
%D
%D \starttyping
%D \protected\def\emphasistypeface{\sl}
%D \protected\def\emphasisboldface{\bs}
%D \stoptyping
%D
%D or even better:
\let\m_font_emphasized_typeface\empty
\def\font_emphasis_checked_typeface#slanted#italic%
{\edef\m_font_emphasized_typeface{\font_bodyfontvariable\s!em}%
\ifx\m_font_emphasized_typeface\v!slanted
#slanted%
\orelse\ifx\m_font_emphasized_typeface\v!italic
#italic%
\orelse\ifempty\m_font_emphasized_typeface
#slanted%
\else
\csname\m_font_emphasized_typeface\endcsname
\fi}
\permanent\protected\def\emphasistypeface{\font_emphasis_checked_typeface\sl\it}
\permanent\protected\def\emphasisboldface{\font_emphasis_checked_typeface\bs\bi}
\permanent\protected\def\normalboldface % public
{\relax
\ifx\fontalternative\s!it\bi\orelse
\ifx\fontalternative\s!sl\bs\else
\bf\fi}
\permanent\protected\def\normalitalicface % public
{\relax
\ifx\fontalternative\s!tf\it\orelse
\ifx\fontalternative\s!bf\bi\else
\tf\fi}
\permanent\protected\def\normalslantedface % public
{\relax \ifx\fontalternative\s!tf\sl
\orelse\ifx\fontalternative\s!bf\bs
\else \tf\fi}
\permanent\protected\def\normaltypeface % public
{\relax
\ifx\fontalternative\s!bi \it \orelse
\ifx\fontalternative\s!bs \sl \else
\tf \fi}
\permanent\protected\def\swaptypeface % public
{\relax
\ifx\fontalternative\s!it \tf \orelse
\ifx\fontalternative\s!sl \tf \orelse
\ifx\fontalternative\s!bf \emphasisboldface \orelse
\ifx\fontalternative\s!bs \bf \orelse
\ifx\fontalternative\s!bi \bf \else
\emphasistypeface \fi}
\let\typeface \normaltypeface % public
\let\boldface \normalboldface % public
\let\slantedface\normalslantedface % public
\let\italicface \normalitalicface % public
\let\swapface \swaptypeface % public
%D To be set with the default body font environment: \type {em} being \type
%D {slanted} or \type {italic}.
% maybe a \csname...\fontalternative\endcsname
\newconditional\c_font_emphasis_needed
\permanent\protected\def\em
{\relax
\ifdim\slantperpoint>\zeropoint
\settrue\c_font_emphasis_needed
\else
\setfalse\c_font_emphasis_needed
\fi
\font_emphasis_set_emphasis_boldface % new
\ifx\fontalternative\s!it
\enforced\permanent\protected\def\emphasistypeface{\it}\tf
\orelse\ifx\fontalternative\s!sl
\enforced\permanent\protected\def\emphasistypeface{\sl}\tf
\orelse\ifx\fontalternative\s!bf
\emphasisboldface
\orelse\ifx\fontalternative\s!bs
\enforced\permanent\protected\def\emphasisboldface{\bs}\bf
\orelse\ifx\fontalternative\s!bi
\enforced\permanent\protected\def\emphasisboldface{\bi}\bf
\else
\emphasistypeface
\fi
\ifconditional\c_font_emphasis_needed\else
\expandafter\aftergroup
\fi
\emphasiscorrection}
%D The next feature was not present in previous versions. It takes care of \type
%D {\em \bf ...} situations.
\let\font_emphasis_saved_emphasis_boldface\relax
\def\font_emphasis_set_emphasis_boldface
{\let\font_emphasis_saved_emphasis_boldface\bf
\let\font_emphasis_set_emphasis_boldface\relax
\enforced\let\bf\font_emphasis_bold_bold}
\protected\def\font_emphasis_bold_bold
{%\relax
\enforced\let\bf\relax % new
\ifx\fontalternative\s!it
\bi
\orelse\ifx\fontalternative\s!sl
\bs
\else
\font_emphasis_saved_emphasis_boldface
\fi
\enforced\let\bf\font_emphasis_saved_emphasis_boldface}
%D Donald's (adapted) macros take the next character into account when placing
%D italic correction. As a bonus we also look for something that looks like a dash,
%D in which case we don't correct.
\let\italiccorrection=\/ % tex primitive
\permanent\protected\def\emphasiscorrection % public, not in raw alignment groups, else omit problem
{\ifhmode\ifnum\currentgrouptype=\aligngroupcode\else
\expandafter\expandafter\expandafter\font_emphasis_look
\fi\fi}
\def\font_emphasis_look
{\begingroup
\futurelet\nexttoken\font_emphasis_test}
\def\font_emphasis_test
{\ifcat\noexpand\nexttoken,% we can do better in luatex ... some day ...
\expandafter\font_emphasis_a
\else
\expandafter\font_emphasis_b
\fi}
\def\font_emphasis_a
{\futurelet\nexttoken\font_emphasis_correction}
\def\font_emphasis_correction
{\setbox\scratchbox\hbox{\nexttoken}% tricky as next can be a macro
\ifzeropt\ht\scratchbox % probably a space
\expandafter\font_emphasis_b
\orelse\ifdim\ht\scratchbox<.3\exheight
\expandafter\expandafter\expandafter\endgroup
\else
\expandafter\expandafter\expandafter\font_emphasis_b
\fi}
\def\font_emphasis_b
{\scratchskip\lastskip
\ifzeropt\scratchskip
\italiccorrection\relax
\else
\unskip\italiccorrection\hskip\scratchskip
\fi
\endgroup}
%D We end with some examples which show the behavior when some punctuation is met.
%D We also show how the mechanism adapts itself to bold, italic and slanted typing.
%D
%D \startbuffer
%D test {test}test \par
%D test {\sl test}test \par
%D test {\em test}test \par
%D test {\em test}--test \par
%D
%D test {test}, test \par
%D test {\em test}, test \par
%D
%D test {\em test {\em test {\em test} test} test} test \par
%D test {\bf test {\em test {\em test} test} test} test \par
%D test {\sl test {\em test {\em test} test} test} test \par
%D test {\it test {\em test {\em test} test} test} test \par
%D \stopbuffer
%D
%D \typebuffer
%D
%D We get:
%D
%D \startpacked
%D \getbuffer
%D \stoppacked
%D \macros
%D {emphbf,emphit,emphsl,emphtf}
%D
%D The next emphasis alternatives are for \THANH. They adapt their style as good as
%D possible. These macros are obsolete in \MKIV.
% \protected\def\emphbf{\groupedcommand{\bf\def\emphit{\bi}\def\emphsl{\bs}}{}}
% \protected\def\emphit{\groupedcommand{\it\def\emphbf{\bi}\def\emphsl{\sl}}{}}
% \protected\def\emphsl{\groupedcommand{\sl\def\emphbf{\bs}\def\emphit{\it}}{}}
% \protected\def\emphtf{\groupedcommand{\tf\def\emphbf{\bf}\def\emphit{\it}\def\emphsl{\sl}}{}}
% \protected\def\emph {\groupedcommand{\em}{}}
\protected\def\font_emphasis_bf{\bf\def\emphit{\bi}\def\emphsl{\bs}}
\protected\def\font_emphasis_it{\it\def\emphbf{\bi}\def\emphsl{\sl}}
\protected\def\font_emphasis_sl{\sl\def\emphbf{\bs}\def\emphit{\it}}
\protected\def\font_emphasis_tf{\tf\def\emphbf{\bf}\def\emphit{\it}\def\emphsl{\sl}}
\permanent\protected\def\emphbf{\triggergroupedcommandcs\font_emphasis_bf}
\permanent\protected\def\emphit{\triggergroupedcommandcs\font_emphasis_it}
\permanent\protected\def\emphsl{\triggergroupedcommandcs\font_emphasis_sl}
\permanent\protected\def\emphtf{\triggergroupedcommandcs\font_emphasis_tf}
\permanent\protected\def\emph {\triggergroupedcommandcs\em}
\permanent\protected\def\emphasized{\bgroup\em\let\nexttoken}
%D \startbuffer
%D TEXT {\emphbf text \emphit text \emphtf text \emphsl text} TEXT
%D TEXT \emphbf{text \emphit{text} \emphtf{text} \emphsl{text}} TEXT
%D \stopbuffer
%D
%D \typebuffer
%D \startlines
%D \getbuffer
%D \stoplines
\protect \endinput
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