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import os
import pytest
from fontTools.ttLib import TTFont
from fontTools.otlLib.maxContextCalc import maxCtxFont
from fontTools.feaLib.builder import addOpenTypeFeaturesFromString
def test_max_ctx_calc_no_features():
font = TTFont()
assert maxCtxFont(font) == 0
font.setGlyphOrder([".notdef"])
addOpenTypeFeaturesFromString(font, "")
assert maxCtxFont(font) == 0
def test_max_ctx_calc_features():
glyphs = ".notdef space A B C a b c".split()
features = """
lookup GSUB_EXT useExtension {
sub a by b;
} GSUB_EXT;
lookup GPOS_EXT useExtension {
pos a b -10;
} GPOS_EXT;
feature sub1 {
sub A by a;
sub A B by b;
sub A B C by c;
sub [A B] C by c;
sub [A B] C [A B] by c;
sub A by A B;
sub A' C by A B;
sub a' by b;
sub a' b by c;
sub a from [A B C];
rsub a by b;
rsub a' by b;
rsub a b' by c;
rsub a b' c by A;
rsub [a b] c' by A;
rsub [a b] c' [a b] by B;
lookup GSUB_EXT;
} sub1;
feature pos1 {
pos A 20;
pos A B -50;
pos A B' 10 C;
lookup GPOS_EXT;
} pos1;
"""
font = TTFont()
font.setGlyphOrder(glyphs)
addOpenTypeFeaturesFromString(font, features)
assert maxCtxFont(font) == 3
@pytest.mark.parametrize(
"file_name, max_context",
[
("gsub_51", 2),
("gsub_52", 2),
("gsub_71", 1),
("gpos_91", 1),
],
)
def test_max_ctx_calc_features_ttx(file_name, max_context):
ttx_path = os.path.join(
os.path.dirname(__file__), "data", "{}.ttx".format(file_name)
)
font = TTFont()
font.importXML(ttx_path)
assert maxCtxFont(font) == max_context
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