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# Copyright 2021-2025 Sebastian Ramacher <sebastian@ramacher.at>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# cython: language_level=3, warn.unused=True
from libc.stddef cimport wchar_t, size_t
from cpython.mem cimport PyMem_Free
cdef extern from "Python.h":
wchar_t* PyUnicode_AsWideCharString(object, Py_ssize_t*) except NULL
Py_ssize_t PyUnicode_AsWideChar(object, wchar_t*, Py_ssize_t)
cdef extern from "wcwidth_compat.h" nogil:
int c_wcswidth "wcswidth" (const wchar_t*, size_t)
int c_wcwidth "wcwidth" (wchar_t)
cdef extern from "<wchar.h>" nogil:
size_t wcslen(const wchar_t*)
cdef int wcswidth_loop(const wchar_t* s, size_t n) nogil:
cdef int v
cdef int ret = 0
for c in s[:n]:
v = c_wcwidth(c)
if v == -1:
return -1
ret += v
return ret
def wcswidth(str pwcs not None, n=None):
"""Return the printable length of a unicode character on a terminal.
Note that this function slightly deviates from wcswidth(3) behavior when the string includes
null characters. As strings are not null terminated, they are treated as characters of width 0
and processing continues until the end of the string.
See wcswidth(3) for more details.
"""
cdef Py_ssize_t actual_length
cdef wchar_t* s = PyUnicode_AsWideCharString(pwcs, &actual_length)
cdef size_t length = actual_length
cdef size_t null_byte_pos = wcslen(s)
cdef size_t converted_n
try:
if n is not None:
converted_n = <size_t>n
if converted_n < length:
length = converted_n
if <size_t>actual_length != null_byte_pos:
# In this case pwcs contains a null character. libc's wcwidth (and other string
# processing functions) will stop when encountering a null character, but in Python the
# null character will just be skipped. So in this case we will emulate wcwidth's
# behavior and sum up the widths of all characters individually.
return wcswidth_loop(s, length)
return c_wcswidth(s, length)
finally:
PyMem_Free(s)
def wcwidth(str wc not None):
"""Return the printable length of a unicode character on a terminal.
See wcwidth(3) for more details.
"""
if len(wc) != 1:
raise ValueError("Expected one unicode character")
cdef wchar_t c
PyUnicode_AsWideChar(wc, &c, 1)
return c_wcwidth(c)
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