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# std imports
import os
import codecs
# 3rd party
import pytest
try:
# python 2
_ = unichr
except NameError:
# python 3
unichr = chr
# some tests cannot be done on some builds of python, where the internal
# unicode structure is limited to 0x10000 for memory conservation,
# "ValueError: unichr() arg not in range(0x10000) (narrow Python build)"
try:
unichr(0x2fffe)
NARROW_ONLY = False
except ValueError:
NARROW_ONLY = True
# local
import wcwidth
def make_sequence_from_line(line):
# convert '002A FE0F ; ..' -> (0x2a, 0xfe0f) -> chr(0x2a) + chr(0xfe0f)
return ''.join(unichr(int(cp, 16)) for cp in line.split(';', 1)[0].strip().split())
@pytest.mark.skipif(NARROW_ONLY, reason="Test cannot verify on python 'narrow' builds")
def emoji_zwj_sequence():
u"""
Emoji zwj sequence of four codepoints is just 2 cells.
"""
phrase = (u"\U0001f469" # Base, Category So, East Asian Width property 'W' -- WOMAN
u"\U0001f3fb" # Modifier, Category Sk, East Asian Width property 'W' -- EMOJI MODIFIER FITZPATRICK TYPE-1-2
u"\u200d" # Joiner, Category Cf, East Asian Width property 'N' -- ZERO WIDTH JOINER
u"\U0001f4bb") # Fused, Category So, East Asian Width peroperty 'W' -- PERSONAL COMPUTER
# This test adapted from https://www.unicode.org/L2/L2023/23107-terminal-suppt.pdf
expect_length_each = (2, 0, 0, 2)
expect_length_phrase = 2
# exercise,
length_each = tuple(map(wcwidth.wcwidth, phrase))
length_phrase = wcwidth.wcswidth(phrase)
# verify.
assert length_each == expect_length_each
assert length_phrase == expect_length_phrase
@pytest.mark.skipif(NARROW_ONLY, reason="Test cannot verify on python 'narrow' builds")
def test_unfinished_zwj_sequence():
u"""
Ensure index-out-of-bounds does not occur for zero-width joiner without any following character
"""
phrase = (u"\U0001f469" # Base, Category So, East Asian Width property 'W' -- WOMAN
u"\U0001f3fb" # Modifier, Category Sk, East Asian Width property 'W' -- EMOJI MODIFIER FITZPATRICK TYPE-1-2
u"\u200d") # Joiner, Category Cf, East Asian Width property 'N' -- ZERO WIDTH JOINER
expect_length_each = (2, 0, 0)
expect_length_phrase = 2
# exercise,
length_each = tuple(map(wcwidth.wcwidth, phrase))
length_phrase = wcwidth.wcswidth(phrase)
# verify.
assert length_each == expect_length_each
assert length_phrase == expect_length_phrase
@pytest.mark.skipif(NARROW_ONLY, reason="Test cannot verify on python 'narrow' builds")
def test_non_recommended_zwj_sequence():
"""
Verify ZWJ is measured as though successful with characters that cannot be joined, wcwidth does not verify
"""
phrase = (u"\U0001f469" # Base, Category So, East Asian Width property 'W' -- WOMAN
u"\U0001f3fb" # Modifier, Category Sk, East Asian Width property 'W' -- EMOJI MODIFIER FITZPATRICK TYPE-1-2
u"\u200d") # Joiner, Category Cf, East Asian Width property 'N' -- ZERO WIDTH JOINER
expect_length_each = (2, 0, 0)
expect_length_phrase = 2
# exercise,
length_each = tuple(map(wcwidth.wcwidth, phrase))
length_phrase = wcwidth.wcswidth(phrase)
# verify.
assert length_each == expect_length_each
assert length_phrase == expect_length_phrase
@pytest.mark.skipif(NARROW_ONLY, reason="Test cannot verify on python 'narrow' builds")
def test_another_emoji_zwj_sequence():
phrase = (
u"\u26F9" # PERSON WITH BALL
u"\U0001F3FB" # EMOJI MODIFIER FITZPATRICK TYPE-1-2
u"\u200D" # ZERO WIDTH JOINER
u"\u2640" # FEMALE SIGN
u"\uFE0F") # VARIATION SELECTOR-16
expect_length_each = (1, 0, 0, 1, 0)
expect_length_phrase = 2
# exercise,
length_each = tuple(map(wcwidth.wcwidth, phrase))
length_phrase = wcwidth.wcswidth(phrase)
# verify.
assert length_each == expect_length_each
assert length_phrase == expect_length_phrase
@pytest.mark.skipif(NARROW_ONLY, reason="Test cannot verify on python 'narrow' builds")
def test_longer_emoji_zwj_sequence():
"""
A much longer emoji ZWJ sequence of 10 total codepoints is just 2 cells!
Also test the same sequence in duplicate, verifying multiple VS-16 sequences
in a single function call.
"""
# 'Category Code', 'East Asian Width property' -- 'description'
phrase = (u"\U0001F9D1" # 'So', 'W' -- ADULT
u"\U0001F3FB" # 'Sk', 'W' -- EMOJI MODIFIER FITZPATRICK TYPE-1-2
u"\u200d" # 'Cf', 'N' -- ZERO WIDTH JOINER
u"\u2764" # 'So', 'N' -- HEAVY BLACK HEART
u"\uFE0F" # 'Mn', 'A' -- VARIATION SELECTOR-16
u"\u200d" # 'Cf', 'N' -- ZERO WIDTH JOINER
u"\U0001F48B" # 'So', 'W' -- KISS MARK
u"\u200d" # 'Cf', 'N' -- ZERO WIDTH JOINER
u"\U0001F9D1" # 'So', 'W' -- ADULT
u"\U0001F3FD" # 'Sk', 'W' -- EMOJI MODIFIER FITZPATRICK TYPE-4
) * 2
# This test adapted from https://www.unicode.org/L2/L2023/23107-terminal-suppt.pdf
expect_length_each = (2, 0, 0, 1, 0, 0, 2, 0, 2, 0) * 2
expect_length_phrase = 4
# exercise,
length_each = tuple(map(wcwidth.wcwidth, phrase))
length_phrase = wcwidth.wcswidth(phrase)
# verify.
assert length_each == expect_length_each
assert length_phrase == expect_length_phrase
def read_sequences_from_file(filename):
fp = codecs.open(os.path.join(os.path.dirname(__file__), filename), 'r', encoding='utf-8')
lines = [line.strip()
for line in fp.readlines()
if not line.startswith('#') and line.strip()]
fp.close()
sequences = [make_sequence_from_line(line) for line in lines]
return lines, sequences
@pytest.mark.skipif(NARROW_ONLY, reason="Some sequences in text file are not compatible with 'narrow' builds")
def test_recommended_emoji_zwj_sequences():
"""
Test wcswidth of all of the unicode.org-published emoji-zwj-sequences.txt
"""
# given,
lines, sequences = read_sequences_from_file('emoji-zwj-sequences.txt')
errors = []
# Exercise, track by zipping with original text file line, a debugging aide
num = 0
for sequence, line in zip(sequences, lines):
num += 1
measured_width = wcwidth.wcswidth(sequence)
if measured_width != 2:
errors.append({
'expected_width': 2,
'line': line,
'measured_width': measured_width,
'sequence': sequence,
})
# verify
assert errors == []
assert num >= 1468
def test_recommended_variation_16_sequences():
"""
Test wcswidth of all of the unicode.org-published emoji-variation-sequences.txt
"""
# given,
lines, sequences = read_sequences_from_file('emoji-variation-sequences.txt')
errors = []
num = 0
for sequence, line in zip(sequences, lines):
num += 1
if '\ufe0f' not in sequence:
# filter for only \uFE0F (VS-16)
continue
measured_width = wcwidth.wcswidth(sequence)
if measured_width != 2:
errors.append({
'expected_width': 2,
'line': line,
'measured_width': wcwidth.wcswidth(sequence),
'sequence': sequence,
})
# verify
assert errors == []
assert num >= 742
def test_unicode_9_vs16():
"""Verify effect of VS-16 on unicode_version 9.0 and later"""
phrase = (u"\u2640" # FEMALE SIGN
u"\uFE0F") # VARIATION SELECTOR-16
expect_length_each = (1, 0)
expect_length_phrase = 2
# exercise,
length_each = tuple(wcwidth.wcwidth(w_char, unicode_version='9.0') for w_char in phrase)
length_phrase = wcwidth.wcswidth(phrase, unicode_version='9.0')
# verify.
assert length_each == expect_length_each
assert length_phrase == expect_length_phrase
def test_unicode_8_vs16():
"""Verify that VS-16 has no effect on unicode_version 8.0 and earler"""
phrase = (u"\u2640" # FEMALE SIGN
u"\uFE0F") # VARIATION SELECTOR-16
expect_length_each = (1, 0)
expect_length_phrase = 1
# exercise,
length_each = tuple(wcwidth.wcwidth(w_char, unicode_version='8.0') for w_char in phrase)
length_phrase = wcwidth.wcswidth(phrase, unicode_version='8.0')
# verify.
assert length_each == expect_length_each
assert length_phrase == expect_length_phrase
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