The microtype package

IMPLEMENTATION: Font setup 57\ifMT@do\MT@feat\MT@maybe@do\MT@dinfo@list\MT@checklist@989 \MT@scrubfeatures#3\relax990 \fi991 }We check all features of the current font against the lists of the currently activefont set, and set \ifMT@do accordingly.992 \newif\ifMT@do993 \def\MT@maybe@do#1{%(but only if the feature isn’t globally set to false)994 \csname ifMT@\csname MT@abbr@#1\endcsname\endcsnameBegin with setting micro-typography to true for this font. The \MT@checklist@...tests will set it to false if the property is not in the list. The first non-empty list thatdoes not contain a match will stop us (except for font).995 \MT@dotrue996 \edef\@tempa{\csname MT@#1@setname\endcsname}%997 \MT@map@clist@n{font,encoding,family,series,shape,size}{%998 \MT@ifdefined@n@TF{MT@checklist@##1}%999 {\csname MT@checklist@##1\endcsname}%1000 {\MT@checklist@{##1}}%1001 {#1}%1002 }%1003 \else1004 \MT@dofalse1005 \fi1006 \ifMT@do\MT@feat stores the current feature.1007 \def\MT@feat{#1}%1008 \csname MT@set@#1@codes\endcsname1009 \else1010 \MT@vinfo{... No \@nameuse{MT@abbr@#1}}%1011 \fi1012 }1013 \def\MT@dinfo@list#1#2#3{\MT@dinfo@nl{1}{\@nameuse{MT@abbr@#1}: #21014 \ifx\\#3\\list empty\else `\@nameuse{MT@#2}’ #3 list\fi}}The generic test (〈#1〉 is the axis, 〈#2〉 the feature, \@tempa contains the set name).1015 \def\MT@checklist@#1#2{%1016 \MT@ifdefined@n@T1017 \MT@ifdefined@n@TF1018 {MT@#2list@#1@\@tempa}{%Begin a (neatly masqueraded) \expandafter orgy to test whether the font attributeis in the list.1019 \expandafter\MT@exp@one@n\expandafter\MT@in@clist1020 \csname MT@#1\expandafter\endcsname1021 \csname MT@#2list@#1@\@tempa\endcsname1022 \ifMT@inlist@1023 \MT@dinfo@list{#2}{#1}{in}%1024 \MT@dotrue1025 \else1026 \MT@dinfo@list{#2}{#1}{not in}%1027 \MT@dofalse1028 \expandafter\MT@clist@break1029 \fi1030 }%If no limitations have been specified, i.e., the list for a font attribute has not beendefined at all, the font should be set up.