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Expose parsed string (before computation) so it can be reused

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This commit is contained in:
Maya Warrier 2023-03-27 22:50:21 -04:00
parent 7385c2053b
commit 8f94758c78
3 changed files with 36 additions and 16 deletions
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2
include/fast_float/ascii_number.h
View File

@ -96,6 +96,7 @@ typedef span<const char> byte_span;
struct parsed_number_string {
int64_t exponent{0};
uint64_t mantissa{0};
uint64_t integer_value{-1};
const char *lastmatch{nullptr};
bool negative{false};
bool valid{false};
@ -143,6 +144,7 @@ parsed_number_string parse_number_string(const char *p, const char *pend, parse_
const char *const end_of_integer_part = p;
int64_t digit_count = int64_t(end_of_integer_part - start_digits);
answer.integer = byte_span(start_digits, size_t(digit_count));
answer.integer_value = i;
int64_t exponent = 0;
if ((p != pend) && (*p == decimal_point)) {
++p;

12
include/fast_float/fast_float.h
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@ -62,6 +62,16 @@ FASTFLOAT_CONSTEXPR20
from_chars_result from_chars_advanced(const char *first, const char *last,
T &value, parse_options options) noexcept;
} // namespace fast_float
}
#include "ascii_number.h" // parsed_number_string
namespace fast_float {
template <typename T>
FASTFLOAT_CONSTEXPR20
from_chars_result from_chars_preparsed(parsed_number_string parsed, T& value) noexcept;
}
// namespace fast_float
#include "parse_number.h"
#endif // FASTFLOAT_FAST_FLOAT_H

38
include/fast_float/parse_number.h
View File

@ -141,24 +141,12 @@ from_chars_result from_chars(const char *first, const char *last,
template<typename T>
FASTFLOAT_CONSTEXPR20
from_chars_result from_chars_advanced(const char *first, const char *last,
T &value, parse_options options) noexcept {
from_chars_result from_chars_preparsed(parsed_number_string pns, T& value) noexcept
{
static_assert (std::is_same<T, double>::value || std::is_same<T, float>::value, "only float and double are supported");
from_chars_result answer;
#if FASTFLOAT_SKIP_WHITE_SPACE // disabled by default
while ((first != last) && fast_float::is_space(uint8_t(*first))) {
first++;
}
#endif
if (first == last) {
answer.ec = std::errc::invalid_argument;
answer.ptr = first;
return answer;
}
parsed_number_string pns = parse_number_string(first, last, options);
if (!pns.valid) {
return detail::parse_infnan(first, last, value);
}
@ -217,6 +205,26 @@ from_chars_result from_chars_advanced(const char *first, const char *last,
return answer;
}
template<typename T>
FASTFLOAT_CONSTEXPR20
from_chars_result from_chars_advanced(const char *first, const char *last,
T &value, parse_options options) noexcept {
from_chars_result answer;
#if FASTFLOAT_SKIP_WHITE_SPACE // disabled by default
while ((first != last) && fast_float::is_space(uint8_t(*first))) {
first++;
}
#endif
if (first == last) {
answer.ec = std::errc::invalid_argument;
answer.ptr = first;
return answer;
}
answer = from_chars_preparsed(parse_number_string(first, last, options), value);
return answer;
}
} // namespace fast_float
#endif