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Merge pull request #308 from fastfloat/turing_json_into_macro_parameter

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turning json option into macro parameter
This commit is contained in:
Daniel Lemire 2025-03-10 09:02:53 -04:00 committed by GitHub
commit e019768d49
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GPG Key ID: B5690EEEBB952194
5 changed files with 21 additions and 13 deletions
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20
include/fast_float/ascii_number.h
View File

@ -279,7 +279,7 @@ report_parse_error(UC const *p, parse_error error) {
// Assuming that you use no more than 19 digits, this will
// parse an ASCII string.
template <typename UC>
template <bool basic_json_fmt, typename UC>
fastfloat_really_inline FASTFLOAT_CONSTEXPR20 parsed_number_string_t<UC>
parse_number_string(UC const *p, UC const *pend,
parse_options_t<UC> options) noexcept {
@ -292,20 +292,20 @@ parse_number_string(UC const *p, UC const *pend,
// assume p < pend, so dereference without checks;
answer.negative = (*p == UC('-'));
// C++17 20.19.3.(7.1) explicitly forbids '+' sign here
if ((*p == UC('-')) ||
(uint64_t(fmt & chars_format::allow_leading_plus) &&
!uint64_t(fmt & detail::basic_json_fmt) && *p == UC('+'))) {
if ((*p == UC('-')) || (uint64_t(fmt & chars_format::allow_leading_plus) &&
!basic_json_fmt && *p == UC('+'))) {
++p;
if (p == pend) {
return report_parse_error<UC>(
p, parse_error::missing_integer_or_dot_after_sign);
}
if (uint64_t(fmt & detail::basic_json_fmt)) {
FASTFLOAT_IF_CONSTEXPR17(basic_json_fmt) {
if (!is_integer(*p)) { // a sign must be followed by an integer
return report_parse_error<UC>(p,
parse_error::missing_integer_after_sign);
}
} else {
}
else {
if (!is_integer(*p) &&
(*p !=
decimal_point)) { // a sign must be followed by an integer or the dot
@ -329,7 +329,7 @@ parse_number_string(UC const *p, UC const *pend,
UC const *const end_of_integer_part = p;
int64_t digit_count = int64_t(end_of_integer_part - start_digits);
answer.integer = span<UC const>(start_digits, size_t(digit_count));
if (uint64_t(fmt & detail::basic_json_fmt)) {
FASTFLOAT_IF_CONSTEXPR17(basic_json_fmt) {
// at least 1 digit in integer part, without leading zeros
if (digit_count == 0) {
return report_parse_error<UC>(p, parse_error::no_digits_in_integer_part);
@ -358,14 +358,14 @@ parse_number_string(UC const *p, UC const *pend,
answer.fraction = span<UC const>(before, size_t(p - before));
digit_count -= exponent;
}
if (uint64_t(fmt & detail::basic_json_fmt)) {
FASTFLOAT_IF_CONSTEXPR17(basic_json_fmt) {
// at least 1 digit in fractional part
if (has_decimal_point && exponent == 0) {
return report_parse_error<UC>(p,
parse_error::no_digits_in_fractional_part);
}
} else if (digit_count ==
0) { // we must have encountered at least one integer!
}
else if (digit_count == 0) { // we must have encountered at least one integer!
return report_parse_error<UC>(p, parse_error::no_digits_in_mantissa);
}
int64_t exp_number = 0; // explicit exponential part

6
include/fast_float/constexpr_feature_detect.h
View File

@ -27,6 +27,12 @@
#define FASTFLOAT_HAS_IS_CONSTANT_EVALUATED 0
#endif
#if defined(__cpp_if_constexpr) && __cpp_if_constexpr >= 201606L
#define FASTFLOAT_IF_CONSTEXPR17(x) if constexpr (x)
#else
#define FASTFLOAT_IF_CONSTEXPR17(x) if (x)
#endif
// Testing for relevant C++20 constexpr library features
#if FASTFLOAT_HAS_IS_CONSTANT_EVALUATED && FASTFLOAT_HAS_BIT_CAST && \
defined(__cpp_lib_constexpr_algorithms) && \

4
include/fast_float/parse_number.h
View File

@ -305,7 +305,9 @@ from_chars_float_advanced(UC const *first, UC const *last, T &value,
return answer;
}
parsed_number_string_t<UC> pns =
parse_number_string<UC>(first, last, options);
uint64_t(fmt & detail::basic_json_fmt)
? parse_number_string<true, UC>(first, last, options)
: parse_number_string<false, UC>(first, last, options);
if (!pns.valid) {
if (uint64_t(fmt & chars_format::no_infnan)) {
answer.ec = std::errc::invalid_argument;

2
tests/json_fmt.cpp
View File

@ -131,7 +131,7 @@ int main() {
for (std::size_t i = 0; i < reject.size(); ++i) {
auto const &f = reject[i].input;
auto const &expected_reason = reject[i].reason;
auto answer = fast_float::parse_number_string(
auto answer = fast_float::parse_number_string<true>(
f.data(), f.data() + f.size(),
fast_float::parse_options(
fast_float::chars_format::json |