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#!/usr/bin/python
"""Test assumptions that web fonts rely on."""
import glob
import json
import unittest
from fontTools import ttLib
from nototools import coverage
from nototools import font_data
from nototools import render
from nototools import unicode_data
def load_fonts():
"""Load all web fonts."""
all_font_files = glob.glob('out/web/*.ttf')
all_fonts = [ttLib.TTFont(font) for font in all_font_files]
assert len(all_font_files) == 12
return all_font_files, all_fonts
class TestVerticalMetrics(unittest.TestCase):
"""Test the vertical metrics of fonts."""
def setUp(self):
_, self.fonts = load_fonts()
def test_ymin_ymax(self):
"""Tests yMin and yMax to be equal to the old values."""
for font in self.fonts:
head_table = font['head']
self.assertEqual(head_table.yMin, -555)
self.assertEqual(head_table.yMax, 2163)
def test_other_metrics(self):
"""Tests other vertical metrics to be equal to the old values."""
for font in self.fonts:
hhea_table = font['hhea']
self.assertEqual(hhea_table.descent, -500)
self.assertEqual(hhea_table.ascent, 1900)
os2_table = font['OS/2']
self.assertEqual(os2_table.sTypoDescender, -512)
self.assertEqual(os2_table.sTypoAscender, 1536)
self.assertEqual(os2_table.sTypoLineGap, 102)
self.assertEqual(os2_table.usWinDescent, 512)
self.assertEqual(os2_table.usWinAscent, 1946)
class TestCharacterCoverage(unittest.TestCase):
"""Tests character coverage."""
def setUp(self):
_, self.fonts = load_fonts()
self.LEGACY_PUA = frozenset({0xEE01, 0xEE02, 0xF6C3})
def test_inclusion_of_legacy_pua(self):
"""Tests that legacy PUA characters remain in the fonts."""
for font in self.fonts:
charset = coverage.character_set(font)
for char in self.LEGACY_PUA:
self.assertIn(char, charset)
def test_non_inclusion_of_other_pua(self):
"""Tests that there are not other PUA characters except legacy ones."""
for font in self.fonts:
charset = coverage.character_set(font)
pua_chars = {
char for char in charset
if 0xE000 <= char <= 0xF8FF or 0xF0000 <= char <= 0x10FFFF}
self.assertTrue(pua_chars <= self.LEGACY_PUA)
def test_lack_of_unassigned_chars(self):
"""Tests that unassigned characters are not in the fonts."""
for font in self.fonts:
charset = coverage.character_set(font)
self.assertNotIn(0x2072, charset)
self.assertNotIn(0x2073, charset)
self.assertNotIn(0x208F, charset)
class TestItalicAngle(unittest.TestCase):
"""Test the italic angle of fonts."""
def setUp(self):
_, self.fonts = load_fonts()
def test_italic_angle(self):
"""Tests the italic angle of fonts to be correct."""
for font in self.fonts:
post_table = font['post']
if 'Italic' in font_data.font_name(font):
expected_angle = -12.0
else:
expected_angle = 0.0
self.assertEqual(post_table.italicAngle, expected_angle)
class TestDigitWidths(unittest.TestCase):
"""Tests the width of digits."""
def setUp(self):
_, self.fonts = load_fonts()
self.digits = [
'zero', 'one', 'two', 'three', 'four',
'five', 'six', 'seven', 'eight', 'nine']
def test_digit_widths(self):
"""Tests all decimal digits to make sure they have the same width."""
for font in self.fonts:
hmtx_table = font['hmtx']
widths = [hmtx_table[digit][0] for digit in self.digits]
self.assertEqual(len(set(widths)), 1)
class TestNames(unittest.TestCase):
"""Tests various strings in the name table."""
def setUp(self):
self.family_name = 'RobotoDraft'
_, self.fonts = load_fonts()
self.names = []
for font in self.fonts:
self.names.append(font_data.get_name_records(font))
def test_copyright(self):
"""Tests the copyright message."""
for records in self.names:
self.assertEqual(
records[0],
'Copyright 2014 Google Inc. All Rights Reserved.')
def test_family_name(self):
"""Tests the family name."""
for records in self.names:
self.assertEqual(records[1], self.family_name)
if 16 in records:
self.assertEqual(records[16], self.family_name)
def test_unique_identifier_and_full_name(self):
"""Tests the unique identifier and full name."""
for records in self.names:
expected_name = records[1] + ' ' + records[2]
self.assertEqual(records[3], expected_name)
self.assertEqual(records[4], expected_name)
self.assertFalse(records.has_key(18))
def test_postscript_name(self):
"""Tests the postscript name."""
for records in self.names:
expected_name = records[1] + '-' + records[2].replace(' ', '')
self.assertEqual(records[6], expected_name)
class TestHints(unittest.TestCase):
"""Tests hints."""
def setUp(self):
_, self.fonts = load_fonts()
# FIXME: remove as soon as issue 100 is fixed
bad_glyphs = ['uniFB01', 'uniFB02', 'uniFB03',
'uniFB04', 'uniFFFC', 'uni048C']
self.known_missing_hints = [
(g, 'RobotoDraft Light Italic') for g in bad_glyphs]
def test_existance_of_hints(self):
"""Tests all glyphs and makes sure non-composite ones have hints."""
missing_hints = []
for font in self.fonts:
glyf_table = font['glyf']
for glyph_name in font.getGlyphOrder():
glyph = glyf_table[glyph_name]
if glyph.numberOfContours <= 0: # composite or empty glyph
continue
if len(glyph.program.bytecode) <= 0:
missing_hints.append(
(glyph_name, font_data.font_name(font)))
self.assertTrue(missing_hints <= self.known_missing_hints)
class TestSpacingMarks(unittest.TestCase):
"""Tests that spacing marks are indeed spacing."""
def setUp(self):
self.font_files, _ = load_fonts()
charset = coverage.character_set(self.font_files[0])
self.marks_to_test = [char for char in charset
if unicode_data.category(char) in ['Lm', 'Sk']]
self.advance_cache = {}
def get_advances(self, text, font):
"""Get a list of horizontal advances for text rendered in a font."""
try:
return self.advance_cache[(text, font)]
except KeyError:
hb_output = render.run_harfbuzz_on_text(text, font, '')
hb_output = json.loads(hb_output)
advances = [glyph['ax'] for glyph in hb_output]
self.advance_cache[(text, font)] = advances
return advances
def test_individual_spacing_marks(self):
"""Tests that spacing marks are spacing by themselves."""
for font in self.font_files:
print 'Testing %s for stand-alone spacing marks...' % font
for mark in self.marks_to_test:
mark = unichr(mark)
advances = self.get_advances(mark, font)
assert len(advances) == 1
self.assertNotEqual(advances[0], 0)
def test_spacing_marks_in_combination(self):
"""Tests that spacing marks do not combine with base letters."""
for font in self.font_files:
print 'Testing %s for spacing marks in combination...' % font
for base_letter in (u'A\u00C6BCDEFGHIJKLMNO\u00D8\u01A0PRST'
u'U\u01AFVWXYZ'
u'a\u00E6bcdefghi\u0131j\u0237klmn'
u'o\u00F8\u01A1prs\u017Ftu\u01B0vwxyz'
u'\u03D2'):
print 'Testing %s combinations' % base_letter
for mark in self.marks_to_test:
mark = unichr(mark)
advances = self.get_advances(base_letter + mark, font)
self.assertEqual(len(advances), 2,
'The sequence <%04X, %04X> combines, '
'but it should not' % (ord(base_letter), ord(mark)))
if __name__ == '__main__':
unittest.main()
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