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termstr: Handle strings already containing zero-width chars

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This commit is contained in:
Andrew Hamilton 2022-08-31 21:09:02 +10:00
parent f0159eb6ff
commit 766956025d
2 changed files with 17 additions and 3 deletions
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13
termstr/termstr.py
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@ -173,8 +173,15 @@ _ZERO_WIDTH_SPACE = "\u200b"
def _pad_wide_chars(str_):
padded_str = "".join(f"{char}{_ZERO_WIDTH_SPACE}"
if cwcwidth.wcwidth(char) == 2 else char for char in str_)
parts = []
last_width = None
for char in str_:
width = cwcwidth.wcwidth(char)
parts.append(f"{_ZERO_WIDTH_SPACE}{char}" if width != 0 and last_width == 2 else char)
last_width = width
padded_str = "".join(parts)
if len(padded_str) > 0 and cwcwidth.wcwidth(padded_str[-1]) == 2:
padded_str += _ZERO_WIDTH_SPACE
return str_ if len(padded_str) == len(str_) else padded_str
@ -307,7 +314,7 @@ class TermStr(collections.UserString):
if len(data) == 0:
result = ""
else:
first_char = " " if data[0] == _ZERO_WIDTH_SPACE else data[0]
first_char = " " if cwcwidth.wcwidth(data[0]) == 0 else data[0]
if len(data) == 1:
result = first_char
else:

7
termstr/tests/termstr_test.py
View file

@ -116,6 +116,13 @@ class TermStrTests(unittest.TestCase):
self.assertEqual(baz[3:], termstr.TermStr("z"))
self.assertEqual(baz[:2], termstr.TermStr("b "))
self.assertEqual(baz[2:], termstr.TermStr(" z"))
baz = termstr.TermStr("b⭐" + chr(65039) + "z")
self.assertEqual(len(baz), 4)
self.assertEqual(baz[3:], termstr.TermStr("z"))
self.assertEqual(baz[:2], termstr.TermStr("b "))
self.assertEqual(baz[2:], termstr.TermStr(" z"))
baz = termstr.TermStr("⭐⭐")
self.assertEqual(len(baz), 4)
def test_from_term(self):
def test_round_trip(term_str):