The microtype package

IMPLEMENTATION: Preliminaries 49\MT@rbba@protrusion\MT@rbba@expansion\MT@rbba@spacing\MT@rbba@kerning\MT@rbba@tracking\MT@features\MT@features@long\MT@is@feature692 \def\MT@abbr@ex{expansion}693 \def\MT@abbr@pr@c{protrusion codes}694 \def\MT@abbr@ex@c{expansion codes}695 \def\MT@abbr@pr@inh{protrusion inheritance}696 \def\MT@abbr@ex@inh{expansion inheritance}697 \def\MT@abbr@nl{noligatures}698 \def\MT@abbr@sp{spacing}699 \def\MT@abbr@sp@c{interword spacing codes}700 \def\MT@abbr@sp@inh{interword spacing inheritance}701 \def\MT@abbr@kn{kerning}702 \def\MT@abbr@kn@c{kerning codes}703 \def\MT@abbr@kn@inh{kerning inheritance}704 \def\MT@abbr@tr{tracking}705 \def\MT@abbr@tr@c{tracking amount}These we also need the other way round.706 \def\MT@rbba@protrusion{pr}707 \def\MT@rbba@expansion{ex}708 \def\MT@rbba@spacing{sp}709 \def\MT@rbba@kerning{kn}710 \def\MT@rbba@tracking{tr}We can work on these lists to save some guards in the dtx file.711 \def\MT@features{pr,ex,sp,kn,tr}712 \def\MT@features@long{protrusion,expansion,spacing,kerning,tracking}Whenever an optional argument accepts a list of features, we can use this commandto check whether a feature exists in order to prevent a rather confusing‘Missing \endcsname inserted’ error message. The feature (long form) must be in\@tempa, the type of list to ignore in 〈#1〉, then comes the action.713 \def\MT@is@feature#1{%714 \MT@exp@one@n\MT@in@clist\@tempa\MT@features@long715 \ifMT@inlist@716 \expandafter\@firstofone717 \else718 \MT@error{`\@tempa’ is not an available micro-typographic\MessageBreak719 feature. Ignoring #1}{Available features are: `\MT@features@long’.}%720 \expandafter\@gobble721 \fi722 }14.1.5 CompatibilityFor the record, the following L A TEX kernel commands will be modified by microtype:• \pickup@font• \do@subst@correction• \add@accent (all in section 14.2.9)• \showhyphens (in section 14.4.6)\MT@setup@The wordcount package redefines the font-switching commands, which willbreak microtype. Since microtype doesn’t have an effect on the number of wordsin the document anyway, we will simply disable ourselves.723 \@ifl@aded{tex}{wordcount}{%724 \MT@warning@nl{Detected the `wordcount’ utility.\MessageBreak725 Disabling `\MT@MT’, since it wouldn’t work}%726 \MT@clear@options\endinput}\relaxThe setup is deferred until the end of the preamble. This has a couple of advantages:\microtypesetup can be used to change options later on in the preamble, and fonts