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Merge pull request #249 from zejal/main

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from_chars_advanced overload function taking parsed_number_string_t
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Daniel Lemire 2024-07-16 10:17:08 -04:00 committed by GitHub
commit 92c79d078b
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1 changed files with 41 additions and 22 deletions
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63
include/fast_float/parse_number.h
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@ -187,35 +187,20 @@ from_chars_result_t<UC> from_chars(UC const * first, UC const * last,
return from_chars_caller<T>::call(first, last, value, parse_options_t<UC>(fmt)); return from_chars_caller<T>::call(first, last, value, parse_options_t<UC>(fmt));
} }
/**
* This function overload takes parsed_number_string_t structure that is created and populated
* either by from_chars_advanced function taking chars range and parsing options
* or other parsing custom function implemented by user.
*/
template<typename T, typename UC> template<typename T, typename UC>
FASTFLOAT_CONSTEXPR20 FASTFLOAT_CONSTEXPR20
from_chars_result_t<UC> from_chars_advanced(UC const * first, UC const * last, from_chars_result_t<UC> from_chars_advanced(parsed_number_string_t<UC>& pns,
T &value, parse_options_t<UC> options) noexcept { T &value) noexcept {
static_assert (is_supported_float_type<T>(), "only some floating-point types are supported"); static_assert (is_supported_float_type<T>(), "only some floating-point types are supported");
static_assert (is_supported_char_type<UC>(), "only char, wchar_t, char16_t and char32_t are supported"); static_assert (is_supported_char_type<UC>(), "only char, wchar_t, char16_t and char32_t are supported");
from_chars_result_t<UC> answer; from_chars_result_t<UC> answer;
#ifdef 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_t<UC> pns = parse_number_string<UC>(first, last, options);
if (!pns.valid) {
if (options.format & chars_format::no_infnan) {
answer.ec = std::errc::invalid_argument;
answer.ptr = first;
return answer;
} else {
return detail::parse_infnan(first, last, value);
}
}
answer.ec = std::errc(); // be optimistic answer.ec = std::errc(); // be optimistic
answer.ptr = pns.lastmatch; answer.ptr = pns.lastmatch;
@ -276,6 +261,40 @@ from_chars_result_t<UC> from_chars_advanced(UC const * first, UC const * last,
return answer; return answer;
} }
template<typename T, typename UC>
FASTFLOAT_CONSTEXPR20
from_chars_result_t<UC> from_chars_advanced(UC const * first, UC const * last,
T &value, parse_options_t<UC> options) noexcept {
static_assert (is_supported_float_type<T>(), "only some floating-point types are supported");
static_assert (is_supported_char_type<UC>(), "only char, wchar_t, char16_t and char32_t are supported");
from_chars_result_t<UC> answer;
#ifdef 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_t<UC> pns = parse_number_string<UC>(first, last, options);
if (!pns.valid) {
if (options.format & chars_format::no_infnan) {
answer.ec = std::errc::invalid_argument;
answer.ptr = first;
return answer;
} else {
return detail::parse_infnan(first, last, value);
}
}
// call overload that takes parsed_number_string_t directly.
return from_chars_advanced(pns, value);
}
template <typename T, typename UC, typename> template <typename T, typename UC, typename>
FASTFLOAT_CONSTEXPR20 FASTFLOAT_CONSTEXPR20