sample_mark_mkmk_features.py

sample_mark_mkmk_features.py

from ufo2ft.featureWriters.markFeatureWriter import MarkFeatureWriter
from fontTools.feaLib.ast import FeatureFile
from ufoLib2 import Font

fea = FeatureFile()

font = Font()

a = font.newGlyph("a")
a.appendAnchor({"name": "top", "x": 500, "y": 600})
a.appendAnchor({"name": "bottom", "x": 500, "y": -100})

b = font.newGlyph("b")
b.appendAnchor({"name": "bottom", "x": 400, "y": -50})

acutecomb = font.newGlyph("acutecomb")
# matching mark anchor prefixed with "_"
acutecomb.appendAnchor({"name": "_top", "x": 300, "y": 700})
# oh look, we have a mark-to-mark! We can stack acute marks on top of one another
acutecomb.appendAnchor({"name": "top", "x": 400, "y": 900})

brevecomb = font.newGlyph("brevecomb")
brevecomb.appendAnchor({"name": "_top", "x": 250, "y": 650})

ogonekcomb = font.newGlyph("ogonekcomb")
ogonekcomb.appendAnchor({"name": "_bottom", "x": 400, "y": 0})
# mark-to-mark ogoneks?! why not
ogonekcomb.appendAnchor({"name": "bottom", "x": 380, "y": -300})

writer = MarkFeatureWriter()
writer.write(font, fea)

print(fea)

"""
markClass ogonekcomb <anchor 400 0> @MC_bottom;
markClass acutecomb <anchor 300 700> @MC_top;
markClass brevecomb <anchor 250 650> @MC_top;

feature mark {
    lookup mark2base {
        pos base a
            <anchor 500 -100> mark @MC_bottom
            <anchor 500 600> mark @MC_top;
        pos base b
            <anchor 400 -50> mark @MC_bottom;
    } mark2base;

} mark;

feature mkmk {
    lookup mark2mark_bottom {
        @MFS_mark2mark_bottom = [ogonekcomb];
        lookupflag UseMarkFilteringSet @MFS_mark2mark_bottom;
        pos mark ogonekcomb
            <anchor 380 -300> mark @MC_bottom;
    } mark2mark_bottom;

    lookup mark2mark_top {
        @MFS_mark2mark_top = [acutecomb brevecomb];
        lookupflag UseMarkFilteringSet @MFS_mark2mark_top;
        pos mark acutecomb
            <anchor 400 900> mark @MC_top;
    } mark2mark_top;

} mkmk;
"""