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#!/usr/bin/python
"""Test assumptions that Android relies 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 fonts built for Android."""
all_font_files = glob.glob('out/android/*.ttf')
all_fonts = [ttLib.TTFont(font) for font in all_font_files]
assert len(all_font_files) == 18
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 what Android expects."""
for font in self.fonts:
head_table = font['head']
self.assertEqual(head_table.yMin, -555)
self.assertEqual(head_table.yMax, 2163)
class TestCharacterCoverage(unittest.TestCase):
"""Tests character coverage."""
def setUp(self):
_, self.fonts = load_fonts()
self.LEGACY_PUA = frozenset({0xEE01, 0xEE02, 0xF6C3})
def test_lack_of_arrows_and_combining_keycap(self):
"""Tests that arrows and combining keycap are not in the fonts."""
for font in self.fonts:
charset = coverage.character_set(font)
self.assertNotIn(0x20E3, charset) # COMBINING ENCLOSING KEYCAP
self.assertNotIn(0x2191, charset) # UPWARDS ARROW
self.assertNotIn(0x2193, charset) # DOWNWARDS ARROW
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)
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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