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"""Tests for grapheme cluster segmentation."""
# std imports
import os
# 3rd party
import pytest
# local
from wcwidth import iter_graphemes, iter_graphemes_reverse, grapheme_boundary_before
try:
chr(0x2fffe)
NARROW_ONLY = False
except ValueError:
NARROW_ONLY = True
def parse_grapheme_break_test_line(line):
"""Parse a line from GraphemeBreakTest.txt."""
data, _, _ = line.partition('#')
data = data.strip()
if not data:
return None, None
parts = []
current_cluster = []
for token in data.split():
if token == '÷':
if current_cluster:
parts.append(current_cluster)
current_cluster = []
elif token == '×':
pass
else:
try:
current_cluster.append(int(token, 16))
except ValueError:
continue
if current_cluster:
parts.append(current_cluster)
all_codepoints = []
expected_clusters = []
for cluster in parts:
cluster_str = ''.join(chr(cp) for cp in cluster)
expected_clusters.append(cluster_str)
all_codepoints.extend(cluster)
if not all_codepoints:
return None, None
input_str = ''.join(chr(cp) for cp in all_codepoints)
return input_str, expected_clusters
def read_grapheme_break_test():
"""Read and parse GraphemeBreakTest.txt."""
import yatest.common as yc
test_file = os.path.join(os.path.dirname(yc.source_path(__file__)), 'GraphemeBreakTest.txt')
if not os.path.exists(test_file):
return []
test_cases = []
with open(test_file, encoding='utf-8') as f:
for line_num, line in enumerate(f, 1):
line = line.strip()
if not line or line.startswith('#'):
continue
input_str, expected = parse_grapheme_break_test_line(line)
if input_str is not None:
test_cases.append(pytest.param(input_str, expected, id=f"line{line_num}"))
return test_cases
@pytest.mark.parametrize(("input_str", "expected"), [
('', []),
('a', ['a']),
('abc', ['a', 'b', 'c']),
('cafe\u0301', ['c', 'a', 'f', 'e\u0301']),
('\r\n', ['\r\n']),
('ok\r\nok', ['o', 'k', '\r\n', 'o', 'k']),
('\r', ['\r']),
('ok\rok', ['o', 'k', '\r', 'o', 'k']),
('\n', ['\n']),
('ok\nok', ['o', 'k', '\n', 'o', 'k']),
('\r\r', ['\r', '\r']),
('ok\r\rok', ['o', 'k', '\r', '\r', 'o', 'k']),
])
def test_core_grapheme(input_str, expected):
"""Basic grapheme cluster segmentation."""
assert list(iter_graphemes(input_str)) == expected
@pytest.mark.parametrize(("input_str", "start", "end", "expected"), [
('abcdef', 2, None, ['c', 'd', 'e', 'f']),
('abcdef', 0, 4, ['a', 'b', 'c', 'd']),
('abcdef', 1, 4, ['b', 'c', 'd']),
('abc', 10, None, []),
('abc', 0, 10, ['a', 'b', 'c']),
])
def test_iter_graphemes_slice(input_str, start, end, expected):
"""Grapheme iteration with start/end parameters."""
assert list(iter_graphemes(input_str, start=start, end=end)) == expected
HANGUL_LV = '\u1100\u1161'
HANGUL_LVT = '\uAC00\u11A8'
FLAG_US = '\U0001F1FA\U0001F1F8'
FLAG_AU = '\U0001F1E6\U0001F1FA'
RI_A = '\U0001F1E6'
FAMILY = '\U0001F468\u200D\U0001F469\u200D\U0001F467'
WAVE_SKIN = '\U0001F44B\U0001F3FB'
HEART_EMOJI = '\u2764\uFE0F'
@pytest.mark.skipif(NARROW_ONLY, reason="requires wide Unicode")
@pytest.mark.parametrize(("input_str", "expected"), [
(HANGUL_LV, [HANGUL_LV]),
('ok' + HANGUL_LV + 'ok', ['o', 'k', HANGUL_LV, 'o', 'k']),
(HANGUL_LVT, [HANGUL_LVT]),
('ok' + HANGUL_LVT + 'ok', ['o', 'k', HANGUL_LVT, 'o', 'k']),
(FLAG_US, [FLAG_US]),
('ok' + FLAG_US + 'ok', ['o', 'k', FLAG_US, 'o', 'k']),
(FLAG_US + RI_A, [FLAG_US, RI_A]),
('ok' + FLAG_US + RI_A + 'ok', ['o', 'k', FLAG_US, RI_A, 'o', 'k']),
(FLAG_US + FLAG_AU, [FLAG_US, FLAG_AU]),
('ok' + FLAG_US + FLAG_AU + 'ok', ['o', 'k', FLAG_US, FLAG_AU, 'o', 'k']),
(FAMILY, [FAMILY]),
('ok' + FAMILY + 'ok', ['o', 'k', FAMILY, 'o', 'k']),
(WAVE_SKIN, [WAVE_SKIN]),
('ok' + WAVE_SKIN + 'ok', ['o', 'k', WAVE_SKIN, 'o', 'k']),
(HEART_EMOJI, [HEART_EMOJI]),
('ok' + HEART_EMOJI + 'ok', ['o', 'k', HEART_EMOJI, 'o', 'k']),
])
def test_wide_unicode_graphemes(input_str, expected):
"""Grapheme segmentation for wide Unicode characters."""
assert list(iter_graphemes(input_str)) == expected
@pytest.mark.skipif(NARROW_ONLY, reason="requires wide Unicode")
@pytest.mark.skipif(not os.path.exists(os.path.join(os.path.dirname(__file__), 'GraphemeBreakTest.txt')),
reason="GraphemeBreakTest.txt is missing; run bin/update-tables.py")
@pytest.mark.parametrize(("input_str", "expected"), read_grapheme_break_test())
def test_unicode_grapheme_break_test(input_str, expected):
"""Validate against official Unicode GraphemeBreakTest.txt."""
assert list(iter_graphemes(input_str)) == expected
# Prepend: Arabic Number Sign
PREPEND_CHAR = '\u0600'
# Multiple combining marks: e + acute + grave
MULTI_COMBINE = 'e\u0301\u0300'
# grapheme_boundary_before(text, pos) returns start of grapheme cluster before pos.
# (text, pos, expected): pos=search from here, expected=where cluster starts
@pytest.mark.parametrize(("text", "pos", "expected"), [
# 'abc': 0=a, 1=b, 2=c
('abc', 3, 2), # from end -> 'c' at 2
('abc', 2, 1), # from 'c' -> 'b' at 1
('abc', 1, 0), # from 'b' -> 'a' at 0
# 'a\r\nb': CRLF is one cluster (GB3)
('a\r\nb', 3, 1), # from 'b' -> '\r\n' at 1
# 'café': e + combining acute is one cluster (GB9)
('cafe\u0301', 5, 3), # from end -> 'é' at 3
('cafe\u0301', 4, 3), # from acute -> still 'é' at 3
# Multiple combining marks: e + acute + grave (GB9)
('a' + MULTI_COMBINE + 'b', 4, 1), # from 'b' -> e+marks at 1
# Prepend + char is one cluster (GB9b)
(PREPEND_CHAR + 'a', 2, 0), # whole cluster
# Prepend + Control: control breaks (GB4)
(PREPEND_CHAR + '\n', 2, 1), # '\n' separate at 1
# C1 control (NEL, 0x85) stops backward scan in _find_cluster_start (GB4)
('X\x85\u0301', 3, 2),
])
def test_grapheme_boundary_before_basic(text, pos, expected):
"""Basic grapheme_boundary_before tests."""
assert grapheme_boundary_before(text, pos) == expected
@pytest.mark.skipif(NARROW_ONLY, reason="requires wide Unicode")
@pytest.mark.parametrize(("text", "pos", "expected"), [
# 'Hi 👋🏻!': 0=H,1=i,2=space,3=wave,4=skin,5=!; wave+skin is one cluster
('Hi \U0001F44B\U0001F3FB!', 6, 5), # from end -> '!' at 5
('Hi \U0001F44B\U0001F3FB!', 5, 3), # from '!' -> wave+skin at 3
('Hi \U0001F44B\U0001F3FB!', 3, 2), # from wave -> space at 2
# 'a🇺🇸b': 0=a,1-2=flag,3=b; flag is one cluster (GB12/13)
('a' + FLAG_US + 'b', 4, 3), # from end -> 'b' at 3
('a' + FLAG_US + 'b', 3, 1), # from 'b' -> flag at 1
# Three RIs (🇺🇸🇦): flag + solo RI
(FLAG_US + RI_A, 3, 2), # from end -> solo RI at 2
(FLAG_US + RI_A, 2, 0), # from solo -> flag at 0
# 'a👨👩👧b': 0=a,1-5=family,6=b; ZWJ sequence is one cluster (GB11)
('a' + FAMILY + 'b', 7, 6), # from end -> 'b' at 6
('a' + FAMILY + 'b', 6, 1), # from 'b' -> family at 1
])
def test_grapheme_boundary_before_unicode(text, pos, expected):
"""grapheme_boundary_before with emoji and wide Unicode."""
assert grapheme_boundary_before(text, pos) == expected
@pytest.mark.parametrize(("input_str", "expected"), [
('', []),
('abc', ['c', 'b', 'a']),
# café with combining mark mixed with CRLF
('cafe\u0301\r\nok', ['k', 'o', '\r\n', 'e\u0301', 'f', 'a', 'c']),
])
def test_iter_graphemes_reverse_basic(input_str, expected):
"""Basic iter_graphemes_reverse tests."""
assert list(iter_graphemes_reverse(input_str)) == expected
@pytest.mark.skipif(NARROW_ONLY, reason="requires wide Unicode")
@pytest.mark.parametrize(("input_str", "expected"), [
# Multiple emoji types in one string
('cafe\u0301 ' + WAVE_SKIN + ' ' + FLAG_US + '!',
['!', FLAG_US, ' ', WAVE_SKIN, ' ', 'e\u0301', 'f', 'a', 'c']),
# Two families
(FAMILY + FAMILY, [FAMILY, FAMILY]),
# Flag + solo RI + text
('Hi' + FLAG_US + RI_A + '!', ['!', RI_A, FLAG_US, 'i', 'H']),
])
def test_iter_graphemes_reverse_unicode(input_str, expected):
"""iter_graphemes_reverse with wide Unicode."""
assert list(iter_graphemes_reverse(input_str)) == expected
@pytest.mark.skipif(NARROW_ONLY, reason="requires wide Unicode")
@pytest.mark.skipif(not os.path.exists(os.path.join(os.path.dirname(__file__), 'GraphemeBreakTest.txt')),
reason="GraphemeBreakTest.txt is missing; run bin/update-tables.py")
@pytest.mark.parametrize(("input_str", "expected"), read_grapheme_break_test())
def test_grapheme_roundtrip_consistency(input_str, expected):
"""Forward and reverse iteration produce identical boundaries."""
forward = list(iter_graphemes(input_str))
reverse = list(iter_graphemes_reverse(input_str))[::-1]
assert forward == reverse
def test_grapheme_boundary_before_edge_cases():
"""Edge cases for grapheme_boundary_before."""
assert grapheme_boundary_before('abc', 0) == 0
assert grapheme_boundary_before('abc', 100) == 2 # pos > len clamps
assert grapheme_boundary_before('', 0) == 0
def test_iter_graphemes_reverse_edge_cases():
"""Edge cases for iter_graphemes_reverse."""
assert list(iter_graphemes_reverse('abcdef', start=2, end=5)) == ['e', 'd', 'c']
assert list(iter_graphemes_reverse('abc', start=0, end=100)) == ['c', 'b', 'a']
assert not list(iter_graphemes_reverse('abc', start=5))
assert not list(iter_graphemes_reverse('abc', start=2, end=2))
# PREPEND + char is one grapheme (GB9b), so start=1 yields nothing (won't split)
assert not list(iter_graphemes_reverse(PREPEND_CHAR + 'a', start=1))
# But start=0 yields the full grapheme
assert list(iter_graphemes_reverse(PREPEND_CHAR + 'a', start=0)) == [PREPEND_CHAR + 'a']
# Negative start is clamped to 0
assert list(iter_graphemes_reverse('abc', start=-5)) == ['c', 'b', 'a']
|
