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25 lines
616 B
Python
25 lines
616 B
Python
import re
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import unicodedata
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import functools
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ANSI_ESCAPE_SEQUENCE = re.compile(r"\x1b\[[ -@]*[A-~]")
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@functools.cache
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def str_width(c: str) -> int:
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if ord(c) < 128:
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return 1
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w = unicodedata.east_asian_width(c)
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if w in ('N', 'Na', 'H', 'A'):
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return 1
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return 2
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def wlen(s: str) -> int:
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if len(s) == 1 and s != '\x1a':
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return str_width(s)
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length = sum(str_width(i) for i in s)
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# remove lengths of any escape sequences
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sequence = ANSI_ESCAPE_SEQUENCE.findall(s)
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ctrl_z_cnt = s.count('\x1a')
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return length - sum(len(i) for i in sequence) + ctrl_z_cnt
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