138 lines
3.6 KiB
Python
138 lines
3.6 KiB
Python
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from io import BytesIO
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import pytest
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import logging
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from matplotlib import afm
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from matplotlib import font_manager as fm
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# See note in afm.py re: use of comma as decimal separator in the
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# UnderlineThickness field and re: use of non-ASCII characters in the Notice
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# field.
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AFM_TEST_DATA = b"""StartFontMetrics 2.0
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Comment Comments are ignored.
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Comment Creation Date:Mon Nov 13 12:34:11 GMT 2017
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FontName MyFont-Bold
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EncodingScheme FontSpecific
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FullName My Font Bold
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FamilyName Test Fonts
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Weight Bold
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ItalicAngle 0.0
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IsFixedPitch false
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UnderlinePosition -100
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UnderlineThickness 56,789
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Version 001.000
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Notice Copyright \xa9 2017 No one.
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FontBBox 0 -321 1234 369
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StartCharMetrics 3
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C 0 ; WX 250 ; N space ; B 0 0 0 0 ;
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C 42 ; WX 1141 ; N foo ; B 40 60 800 360 ;
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C 99 ; WX 583 ; N bar ; B 40 -10 543 210 ;
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EndCharMetrics
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EndFontMetrics
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"""
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def test_nonascii_str():
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# This tests that we also decode bytes as utf-8 properly.
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# Else, font files with non ascii characters fail to load.
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inp_str = "привет"
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byte_str = inp_str.encode("utf8")
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ret = afm._to_str(byte_str)
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assert ret == inp_str
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def test_parse_header():
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fh = BytesIO(AFM_TEST_DATA)
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header = afm._parse_header(fh)
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assert header == {
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b'StartFontMetrics': 2.0,
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b'FontName': 'MyFont-Bold',
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b'EncodingScheme': 'FontSpecific',
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b'FullName': 'My Font Bold',
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b'FamilyName': 'Test Fonts',
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b'Weight': 'Bold',
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b'ItalicAngle': 0.0,
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b'IsFixedPitch': False,
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b'UnderlinePosition': -100,
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b'UnderlineThickness': 56.789,
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b'Version': '001.000',
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b'Notice': b'Copyright \xa9 2017 No one.',
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b'FontBBox': [0, -321, 1234, 369],
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b'StartCharMetrics': 3,
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}
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def test_parse_char_metrics():
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fh = BytesIO(AFM_TEST_DATA)
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afm._parse_header(fh) # position
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metrics = afm._parse_char_metrics(fh)
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assert metrics == (
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{0: (250.0, 'space', [0, 0, 0, 0]),
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42: (1141.0, 'foo', [40, 60, 800, 360]),
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99: (583.0, 'bar', [40, -10, 543, 210]),
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},
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{'space': (250.0, 'space', [0, 0, 0, 0]),
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'foo': (1141.0, 'foo', [40, 60, 800, 360]),
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'bar': (583.0, 'bar', [40, -10, 543, 210]),
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})
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def test_get_familyname_guessed():
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fh = BytesIO(AFM_TEST_DATA)
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font = afm.AFM(fh)
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del font._header[b'FamilyName'] # remove FamilyName, so we have to guess
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assert font.get_familyname() == 'My Font'
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def test_font_manager_weight_normalization():
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font = afm.AFM(BytesIO(
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AFM_TEST_DATA.replace(b"Weight Bold\n", b"Weight Custom\n")))
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assert fm.afmFontProperty("", font).weight == "normal"
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@pytest.mark.parametrize(
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"afm_data",
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[
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b"""nope
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really nope""",
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b"""StartFontMetrics 2.0
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Comment Comments are ignored.
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Comment Creation Date:Mon Nov 13 12:34:11 GMT 2017
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FontName MyFont-Bold
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EncodingScheme FontSpecific""",
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],
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)
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def test_bad_afm(afm_data):
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fh = BytesIO(afm_data)
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with pytest.raises(RuntimeError):
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header = afm._parse_header(fh)
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@pytest.mark.parametrize(
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"afm_data",
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[
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b"""StartFontMetrics 2.0
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Comment Comments are ignored.
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Comment Creation Date:Mon Nov 13 12:34:11 GMT 2017
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Aardvark bob
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FontName MyFont-Bold
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EncodingScheme FontSpecific
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StartCharMetrics 3""",
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b"""StartFontMetrics 2.0
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Comment Comments are ignored.
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Comment Creation Date:Mon Nov 13 12:34:11 GMT 2017
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ItalicAngle zero degrees
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FontName MyFont-Bold
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EncodingScheme FontSpecific
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StartCharMetrics 3""",
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],
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)
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def test_malformed_header(afm_data, caplog):
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fh = BytesIO(afm_data)
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with caplog.at_level(logging.ERROR):
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header = afm._parse_header(fh)
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assert len(caplog.records) == 1
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