gh-130273: Fix incorrectly colored error locations when wide unicode characters exists #130277
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| for i in range(start, len(line)): | ||
| if width <= 0: | ||
| return i, line[start:i] | ||
| width -= 2 if east_asian_width(line[i]) in _WIDE_CHAR_SPECIFIERS else 1 |
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does this correctly handle zero-width characters? e.g. the '\u0301' from 'cafe\u0301'
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No.
However, _display_width() does not correctly handle zero-width characters for carets positions either.
>>> café = 1/0
Traceback (most recent call last):
File "<python-input-0>", line 1, in <module>
café = 1/0
~^~
ZeroDivisionError: division by zero
>>> They can be fixed in the same way. I wonder how I can find all the zero-width characters.
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It looks like there are many zero-width characters: https://wcwidth.readthedocs.io/en/latest/specs.html#width-of-0
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This is how wcwidth implements wcswidth() and wcwidth(): https://wcwidth.readthedocs.io/en/latest/_modules/wcwidth/wcwidth.html#wcswidth
Maybe it is too complicated for our traceback? Could we have a simple way that can handle most of the cases?
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