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fonttools/Tests/ttLib/tables/_k_e_r_n_test.py

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from __future__ import print_function, absolute_import
from fontTools.misc.py23 import *
from fontTools.ttLib import newTable
from fontTools.ttLib.tables._k_e_r_n import (
KernTable_format_0, KernTable_format_unkown)
from fontTools.misc.textTools import deHexStr
from fontTools.misc.testTools import FakeFont, getXML, parseXML
import pytest
KERN_VER_0_FMT_0_DATA = deHexStr(
'0000 ' # 0: version=0
'0001 ' # 2: nTables=1
'0000 ' # 4: version=0 (bogus field, unused)
'0020 ' # 6: length=32
'0000 ' # 8: coverage=0
'0003 ' # 10: nPairs=3
'000C ' # 12: searchRange=12
'0001 ' # 14: entrySelector=1
'0006 ' # 16: rangeShift=6
'0004 000C FFD8 ' # 18: l=4, r=12, v=-40
'0004 001C 0028 ' # 24: l=4, r=28, v=40
'0005 0028 FFCE ' # 30: l=5, r=40, v=-50
)
assert len(KERN_VER_0_FMT_0_DATA) == 36
KERN_VER_0_FMT_0_XML = [
'<version value="0"/>',
'<kernsubtable coverage="0" format="0">',
' <pair l="E" r="M" v="-40"/>',
' <pair l="E" r="c" v="40"/>',
' <pair l="F" r="o" v="-50"/>',
'</kernsubtable>',
]
KERN_VER_1_FMT_0_DATA = deHexStr(
'0001 0000 ' # 0: version=1
'0000 0001 ' # 4: nTables=1
'0000 0022 ' # 8: length=34
'0000 ' # 12: coverage=0
'0000 ' # 14: tupleIndex=0
'0003 ' # 16: nPairs=3
'000C ' # 18: searchRange=12
'0001 ' # 20: entrySelector=1
'0006 ' # 22: rangeShift=6
'0004 000C FFD8 ' # 24: l=4, r=12, v=-40
'0004 001C 0028 ' # 30: l=4, r=28, v=40
'0005 0028 FFCE ' # 36: l=5, r=40, v=-50
)
assert len(KERN_VER_1_FMT_0_DATA) == 42
KERN_VER_1_FMT_0_XML = [
'<version value="1.0"/>',
'<kernsubtable coverage="0" format="0" tupleIndex="0">',
' <pair l="E" r="M" v="-40"/>',
' <pair l="E" r="c" v="40"/>',
' <pair l="F" r="o" v="-50"/>',
'</kernsubtable>',
]
KERN_VER_0_FMT_UNKNOWN_DATA = deHexStr(
'0000 ' # 0: version=0
'0002 ' # 2: nTables=2
'0000 ' # 4: version=0
'000A ' # 6: length=10
'0004 ' # 8: coverage=4 (format 4 doesn't exist)
'1234 5678 ' # 10: garbage...
'0000 ' # 14: version=0
'000A ' # 16: length=10
'0005 ' # 18: coverage=5 (format 5 doesn't exist)
'9ABC DEF0 ' # 20: garbage...
)
assert len(KERN_VER_0_FMT_UNKNOWN_DATA) == 24
KERN_VER_1_FMT_UNKNOWN_DATA = deHexStr(
'0001 0000 ' # 0: version=1
'0000 0002 ' # 4: nTables=2
'0000 000C ' # 8: length=12
'0004 ' # 12: coverage=4 (format 4 doesn't exist)
'0000 ' # 14: tupleIndex=0
'1234 5678' # 16: garbage...
'0000 000C ' # 20: length=12
'0005 ' # 18: coverage=5 (format 5 doesn't exist)
'0000 ' # 20: tupleIndex=0
'9ABC DEF0 ' # 22: garbage...
)
assert len(KERN_VER_1_FMT_UNKNOWN_DATA) == 32
@pytest.fixture
def font():
return FakeFont(list("ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"))
class KernTableTest(object):
@pytest.mark.parametrize(
"data, version",
[
(KERN_VER_0_FMT_0_DATA, 0),
(KERN_VER_1_FMT_0_DATA, 1.0),
],
ids=["version_0", "version_1"]
)
def test_decompile_single_format_0(self, data, font, version):
kern = newTable("kern")
kern.decompile(data, font)
assert kern.version == version
assert len(kern.kernTables) == 1
st = kern.kernTables[0]
assert st.apple is (version == 1.0)
assert st.format == 0
assert st.coverage == 0
assert st.tupleIndex == (0 if st.apple else None)
assert len(st.kernTable) == 3
assert st.kernTable == {
('E', 'M'): -40,
('E', 'c'): 40,
('F', 'o'): -50
}
@pytest.mark.parametrize(
"version, expected",
[
(0, KERN_VER_0_FMT_0_DATA),
(1.0, KERN_VER_1_FMT_0_DATA),
],
ids=["version_0", "version_1"]
)
def test_compile_single_format_0(self, font, version, expected):
kern = newTable("kern")
kern.version = version
apple = version == 1.0
st = KernTable_format_0(apple)
kern.kernTables = [st]
st.coverage = 0
st.tupleIndex = 0 if apple else None
st.kernTable = {
('E', 'M'): -40,
('E', 'c'): 40,
('F', 'o'): -50
}
data = kern.compile(font)
assert data == expected
@pytest.mark.parametrize(
"xml, version",
[
(KERN_VER_0_FMT_0_XML, 0),
(KERN_VER_1_FMT_0_XML, 1.0),
],
ids=["version_0", "version_1"]
)
def test_fromXML_single_format_0(self, xml, font, version):
kern = newTable("kern")
for name, attrs, content in parseXML(xml):
kern.fromXML(name, attrs, content, ttFont=font)
assert kern.version == version
assert len(kern.kernTables) == 1
st = kern.kernTables[0]
assert st.apple is (version == 1.0)
assert st.format == 0
assert st.coverage == 0
assert st.tupleIndex == (0 if st.apple else None)
assert len(st.kernTable) == 3
assert st.kernTable == {
('E', 'M'): -40,
('E', 'c'): 40,
('F', 'o'): -50
}
@pytest.mark.parametrize(
"version, expected",
[
(0, KERN_VER_0_FMT_0_XML),
(1.0, KERN_VER_1_FMT_0_XML),
],
ids=["version_0", "version_1"]
)
def test_toXML_single_format_0(self, font, version, expected):
kern = newTable("kern")
kern.version = version
apple = version == 1.0
st = KernTable_format_0(apple)
kern.kernTables = [st]
st.coverage = 0
st.tupleIndex = 0 if apple else None
st.kernTable = {
('E', 'M'): -40,
('E', 'c'): 40,
('F', 'o'): -50
}
xml = getXML(kern.toXML, font)
assert xml == expected
@pytest.mark.parametrize(
"data, version, header_length, st_length",
[
(KERN_VER_0_FMT_UNKNOWN_DATA, 0, 4, 10),
(KERN_VER_1_FMT_UNKNOWN_DATA, 1.0, 8, 12),
],
ids=["version_0", "version_1"]
)
def test_decompile_format_unknown(
self, data, font, version, header_length, st_length):
kern = newTable("kern")
kern.decompile(data, font)
assert kern.version == version
assert len(kern.kernTables) == 2
st_data = data[header_length:]
st0 = kern.kernTables[0]
assert st0.format == 4
assert st0.data == st_data[:st_length]
st_data = st_data[st_length:]
st1 = kern.kernTables[1]
assert st1.format == 5
assert st1.data == st_data[:st_length]
@pytest.mark.parametrize(
"version, st_length, expected",
[
(0, 10, KERN_VER_0_FMT_UNKNOWN_DATA),
(1.0, 12, KERN_VER_1_FMT_UNKNOWN_DATA),
],
ids=["version_0", "version_1"]
)
def test_compile_format_unknown(self, version, st_length, expected):
kern = newTable("kern")
kern.version = version
kern.kernTables = []
for unknown_fmt, kern_data in zip((4, 5), ("1234 5678", "9ABC DEF0")):
coverage = unknown_fmt
if version > 0:
header_fmt = deHexStr(
"%08X %04X %04X" % (st_length, coverage, 0))
else:
header_fmt = deHexStr(
"%04X %04X %04X" % (0, st_length, coverage))
st = KernTable_format_unkown(unknown_fmt)
st.data = header_fmt + deHexStr(kern_data)
kern.kernTables.append(st)
data = kern.compile(font)
assert data == expected
def test_getkern(self, table):
table = newTable("kern")
table.version = 0
table.kernTables = []
assert table.getkern(0) is None
st0 = KernTable_format_0()
table.kernTables.append(st0)
assert table.getkern(0) is st0
assert table.getkern(4) is None
st1 = KernTable_format_unkown(4)
table.kernTables.append(st1)
class KernTable_format_0_Test(object):
def test_decompileBadGlyphId(self, font):
subtable = KernTable_format_0()
subtable.decompile(
b'\x00' + b'\x00' + b'\x00' + b'\x1a' + b'\x00' + b'\x00' +
b'\x00' + b'\x02' + b'\x00' * 6 +
b'\x00' + b'\x01' + b'\x00' + b'\x03' + b'\x00' + b'\x01' +
b'\x00' + b'\x01' + b'\xFF' + b'\xFF' + b'\x00' + b'\x02',
font)
assert subtable[("B", "D")] == 1
assert subtable[("B", "glyph65535")] == 2
if __name__ == "__main__":
import sys
sys.exit(pytest.main(sys.argv))
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