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import os
import pytest
import unittest
from fontTools.ttLib import TTFont
from fontTools.ttLib.tables.ttProgram import Program
from extractor.stream import InstructionStream
sample = """PUSHB[ ] /* 4 values pushed */
1 2 3 4
PUSHW[ ] /* 2 values pushed */
1 -1
PUSHW[ ] /* 2 values pushed */
5 512
SPVTCA[0] /* SetPVectorToAxis */
SPVTCA[1] /* SetPVectorToAxis */
SFVTL[0] /* SetFVectorToLine */
SFVTL[1] /* SetFVectorToLine */
MDAP[0] /* MoveDirectAbsPt */
MDAP[1] /* MoveDirectAbsPt */
IF[ ] /* If */
SHP[0] /* ShiftPointByLastPoint */
SHC[1] /* ShiftContourByLastPt */
EIF[ ] /* EndIf */
MSIRP[1] /* MoveStackIndirRelPt */
MD[0] /* MeasureDistance */
GC[1] /* GetCoordOnPVector */
ROUND[01] /* Round */
MDRP[00110] /* MoveDirectRelPt */"""
expected_vtt = """#PUSHOFF
#PUSH, 1, 2, 3, 4
#PUSH, 1, -1
#PUSH, 5, 512
SPVTCA[Y] /* SetPVectorToAxis */
SPVTCA[X] /* SetPVectorToAxis */
SFVTL[r] /* SetFVectorToLine */
SFVTL[R] /* SetFVectorToLine */
MDAP[r] /* MoveDirectAbsPt */
MDAP[R] /* MoveDirectAbsPt */
IF[] /* If */
SHP[2] /* ShiftPointByLastPoint */
SHC[1] /* ShiftContourByLastPt */
EIF[] /* EndIf */
MSIRP[M] /* MoveStackIndirRelPt */
MD[N] /* MeasureDistance */
GC[O] /* GetCoordOnPVector */
ROUND[Bl] /* Round */
MDRP[m<RWh] /* MoveDirectRelPt */
#PUSHON"""
sample_keyerror = "MDRP[00111] /* MoveDirectRelPt */"
def data_path(file_name):
return os.path.join(
os.path.dirname(__file__),
"data",
"ibm_plex",
file_name,
)
class InstructionStreamTests(unittest.TestCase):
def _compile(self, ttassembly: str) -> bytes:
pgm = Program()
pgm.fromAssembly(ttassembly)
return pgm.getBytecode()
def test_extract_ttx(self):
font = TTFont(data_path("IBM Plex Serif-Text-FL.ttf"))
with open(data_path("IBM Plex Serif-Text-FL.fpgm.ttxasm")) as f:
expected_fpgm = f.read()
fpgm = font["fpgm"]
stream = InstructionStream(program_bytes=fpgm.program.getBytecode())
print(stream)
expected_lines = expected_fpgm.splitlines()
for i, line in enumerate(str(stream).splitlines()):
assert line == expected_lines[i]
def test_extract_vtt(self):
font = TTFont(data_path("IBM Plex Serif-Text-FL.ttf"))
with open(data_path("IBM Plex Serif-Text-FL.fpgm.vttasm")) as f:
expected_fpgm = f.read()
fpgm = font["fpgm"]
stream = InstructionStream(program_bytes=fpgm.program.getBytecode())
expected_lines = expected_fpgm.splitlines()
for i, line in enumerate(stream.vtt_assembly.splitlines()):
assert line == expected_lines[i]
def test_complex_ttx(self):
stream = InstructionStream(program_bytes=self._compile(sample))
# Roundtripped sample should be identical
expected_lines = sample.splitlines()
for i, line in enumerate(str(stream).splitlines()):
assert line == expected_lines[i]
def test_complex_vtt(self):
stream = InstructionStream(program_bytes=self._compile(sample))
expected_lines = expected_vtt.splitlines()
for i, line in enumerate(stream.vtt_assembly.splitlines()):
assert line == expected_lines[i]
def test_illegal_ttx(self):
# Sample contains illegal flags, ttx does ignore this
stream = InstructionStream(
program_bytes=self._compile(sample_keyerror)
)
# Roundtripped sample should be identical
assert str(stream) == sample_keyerror
def test_illegal_vtt(self):
# Sample contains illegal flags, vtt should raise an error
stream = InstructionStream(
program_bytes=self._compile(sample_keyerror)
)
with pytest.raises(KeyError):
assert stream.vtt_assembly == sample
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