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# Discretionary Ligatures
# https://learn.microsoft.com/en-us/typography/opentype/spec/features_ae#dlig
# Set IgnoreMarks to skip over marks in lookups.
# For example, if we have /f/acutecomb/i, treat lookup as /f/i
# https://learn.microsoft.com/en-us/typography/opentype/spec/chapter2#lookup-table
lookupflag IgnoreMarks;
# fi
sub f' [
i idotless idotless.double itildebelow ibar igrave iacute iogonek
ihookabove idotbelow icyrillic ij i.sc
j jdotless jdotlessbar uni0249 uni0249.ccmp jcrosstail yotgreek jecyrillic
] by f.i;
# ff -> ff'
@DLIG_f_L = [ f fdotaccent feng ];
@DLIG_f_R = [ f.1 fdotaccent.1 feng.1 ];
# tt -> tt'
@DLIG_t_L = [
t tpalatalhook tcedilla tcaron tcommaaccent tdotaccent tdotbelow
tlinebelow tcircumflexbelow tdieresis
];
@DLIG_t_R = [
t.1 tpalatalhook.1 tcedilla.1 tcaron.1 tcommaaccent.1 tdotaccent.1 tdotbelow.1
tlinebelow.1 tcircumflexbelow.1 tdieresis.1
];
# left side "trigger" glyph for t.1 and f.1 sub
@DLIG_t1_L = [
@DLIG_f_L @DLIG_f_R
k khook kcommaaccent kcaron kacute kdotbelow klinebelow k.base
r rrthook uni024D rfishhook rdescend racute rcommaaccent rcaron
rdblgrave rinvertedbreve rdotaccent rdotbelow rdotbelowmacron rlinebelow
@DLIG_t_L @DLIG_t_R
v vtilde vdotbelow
w wdieresis wcircumflex wgrave wacute wdotaccent wdotbelow wring
x xdotaccent xdieresis khacyrillic chi
y ydieresis uni024F yacute ycircumflex uni0233 ydotaccent yring ygrave ydotbelow
yhookabove ytilde ucyrillic ushortcyrillic umacroncyrillic udieresiscyrillic
uhungarumlautcyrillic yogonek y.sc
# lower case glyphs with long ("beyond x-height") left vertical stroke
d dcroat drthook dhook dtopbar dcurl ddotaccent ddotbelow dlinebelow dcedilla
dcircumflexbelow dong
l lslash lbar lmidtilde lrthook lbelt lcurl ldot lacute
lcommaaccent lcaron
ldotbelow ldotbelowmacron llinebelow lcircumflexbelow
l.ss02 lslash.ss02 lbar.ss02 lmidtilde.ss02 lbelt.ss02 ldot.ss02 lacute.ss02
lcommaaccent.ss02 lcaron.ss02
ldotbelow.ss02 ldotbelowmacron.ss02 llinebelow.ss02 lcircumflexbelow.ss02
];
# ffi (note. f.i is sub'd by liga)
sub f [ f f.i ]' i by f.i.1;
# tt, ft, rt, tf, ff, ft ...
sub @DLIG_t1_L @DLIG_t_L' by @DLIG_t_R;
sub @DLIG_t1_L @DLIG_f_L' by @DLIG_f_R;
# interrobang
sub exclam question by interrobang;
sub question exclam by interrobang;
sub exclamdown questiondown by invertedinterrobang;
sub questiondown exclamdown by invertedinterrobang;
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