coffee/fast_float
1
0
Fork 0
mirror of https://github.com/fastfloat/fast_float.git synced 2026-02-09 11:16:45 +08:00
Code Issues Packages Projects Releases Wiki Activity

Handle digit separators in exponent and fraction parsing

Browse Source
This commit is contained in:
재욱 2026-02-08 18:21:37 +09:00
parent 587d890fa0
commit b50eeab22a
1 changed files with 17 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
include/fast_float/ascii_number.h
View File

@ -401,7 +401,10 @@ parse_number_string(UC const *p, UC const *pend,
// can occur at most twice without overflowing, but let it occur more, since // can occur at most twice without overflowing, but let it occur more, since
// for integers with many digits, digit parsing is the primary bottleneck. // for integers with many digits, digit parsing is the primary bottleneck.
if (options.digit_separator == UC('\0')) { if (options.digit_separator == UC('\0')) {
UC const *const before_simd = p;
loop_parse_if_eight_digits(p, pend, i); loop_parse_if_eight_digits(p, pend, i);
size_t const exploded = size_t(p - before_simd);
fractional_digit_count += int64_t(exploded);
} }
while (p != pend) { while (p != pend) {
@ -523,10 +526,21 @@ parse_number_string(UC const *p, UC const *pend,
++p; ++p;
} }
if (i >= minimal_nineteen_digit_integer) { // We have a big integer if (i >= minimal_nineteen_digit_integer) { // We have a big integer
exponent = end_of_integer_part - p + exp_number; int64_t remaining_integer_digits = 0;
while (p != int_end) {
if (options.digit_separator != UC('\0') &&
*p == options.digit_separator) {
++p;
continue;
}
++p;
++remaining_integer_digits;
}
exponent = remaining_integer_digits + exp_number;
} else { // We have a value with a fractional component. } else { // We have a value with a fractional component.
p = answer.fraction.ptr; p = answer.fraction.ptr;
UC const *frac_end = p + answer.fraction.len(); UC const *frac_end = p + answer.fraction.len();
int64_t fraction_digits_consumed = 0;
while ((i < minimal_nineteen_digit_integer) && (p != frac_end)) { while ((i < minimal_nineteen_digit_integer) && (p != frac_end)) {
if (options.digit_separator != UC('\0') && if (options.digit_separator != UC('\0') &&
*p == options.digit_separator) { *p == options.digit_separator) {
@ -535,8 +549,9 @@ parse_number_string(UC const *p, UC const *pend,
} }
i = i * 10 + uint64_t(*p - UC('0')); i = i * 10 + uint64_t(*p - UC('0'));
++p; ++p;
++fraction_digits_consumed;
} }
exponent = answer.fraction.ptr - p + exp_number; exponent = exp_number - fraction_digits_consumed;
} }
// We have now corrected both exponent and i, to a truncated value // We have now corrected both exponent and i, to a truncated value
} }