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gh-87790: support thousands separators for formatting fractional part of floats (#125304)

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```pycon
>>> f"{123_456.123_456:_._f}"  # Whole and fractional
'123_456.123_456'
>>> f"{123_456.123_456:_f}"    # Integer component only
'123_456.123456'
>>> f"{123_456.123_456:._f}"   # Fractional component only
'123456.123_456'
>>> f"{123_456.123_456:.4_f}"  # with precision
'123456.1_235'
```
This commit is contained in:
Sergey B Kirpichev 2025-02-25 18:27:07 +03:00 • committed by GitHub
parent fa6a8140dd
commit f39a07be47
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GPG key ID: B5690EEEBB952194
9 changed files with 218 additions and 45 deletions
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27
Objects/stringlib/localeutil.h
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@ -47,7 +47,7 @@ InsertThousandsGrouping_fill(_PyUnicodeWriter *writer, Py_ssize_t *buffer_pos,
PyObject *digits, Py_ssize_t *digits_pos,
Py_ssize_t n_chars, Py_ssize_t n_zeros,
PyObject *thousands_sep, Py_ssize_t thousands_sep_len,
Py_UCS4 *maxchar)
Py_UCS4 *maxchar, int forward)
{
if (!writer) {
/* if maxchar > 127, maxchar is already set */
@ -59,24 +59,39 @@ InsertThousandsGrouping_fill(_PyUnicodeWriter *writer, Py_ssize_t *buffer_pos,
}
if (thousands_sep) {
*buffer_pos -= thousands_sep_len;
if (!forward) {
*buffer_pos -= thousands_sep_len;
}
/* Copy the thousands_sep chars into the buffer. */
_PyUnicode_FastCopyCharacters(writer->buffer, *buffer_pos,
thousands_sep, 0,
thousands_sep_len);
if (forward) {
*buffer_pos += thousands_sep_len;
}
}
*buffer_pos -= n_chars;
*digits_pos -= n_chars;
if (!forward) {
*buffer_pos -= n_chars;
*digits_pos -= n_chars;
}
_PyUnicode_FastCopyCharacters(writer->buffer, *buffer_pos,
digits, *digits_pos,
n_chars);
if (forward) {
*buffer_pos += n_chars;
*digits_pos += n_chars;
}
if (n_zeros) {
*buffer_pos -= n_zeros;
if (!forward) {
*buffer_pos -= n_zeros;
}
int kind = PyUnicode_KIND(writer->buffer);
void *data = PyUnicode_DATA(writer->buffer);
unicode_fill(kind, data, '0', *buffer_pos, n_zeros);
if (forward) {
*buffer_pos += n_zeros;
}
}
}