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101 lines
3 KiB
C++
101 lines
3 KiB
C++
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/*
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* Copyright (c) 2022, David Tuin <davidot@serenityos.org>
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* Copyright (c) 2025, Tim Flynn <trflynn89@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StringConversions.h>
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#include <AK/StringView.h>
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#include <fast_float/fast_float.h>
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namespace AK {
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#define ENUMERATE_INTEGRAL_TYPES \
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__ENUMERATE_TYPE(i8) \
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__ENUMERATE_TYPE(i16) \
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__ENUMERATE_TYPE(i32) \
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__ENUMERATE_TYPE(long) \
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__ENUMERATE_TYPE(long long) \
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__ENUMERATE_TYPE(u8) \
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__ENUMERATE_TYPE(u16) \
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__ENUMERATE_TYPE(u32) \
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__ENUMERATE_TYPE(unsigned long) \
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__ENUMERATE_TYPE(unsigned long long)
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#define ENUMERATE_ARITHMETIC_TYPES \
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ENUMERATE_INTEGRAL_TYPES \
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__ENUMERATE_TYPE(float) \
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__ENUMERATE_TYPE(double)
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template<Arithmetic T>
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Optional<ParseFirstNumberResult<T>> parse_first_number(StringView string, TrimWhitespace trim_whitespace, int base)
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{
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if (trim_whitespace == TrimWhitespace::Yes)
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string = StringUtils::trim_whitespace(string, TrimMode::Both);
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auto const* begin = string.characters_without_null_termination();
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auto const* end = begin + string.length();
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T value { 0 };
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fast_float::parse_options_t<char> options;
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options.base = base;
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options.format |= fast_float::chars_format::no_infnan;
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if constexpr (IsSigned<T> || IsFloatingPoint<T>) {
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options.format |= fast_float::chars_format::allow_leading_plus;
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}
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auto result = fast_float::from_chars_advanced(begin, end, value, options);
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if constexpr (IsFloatingPoint<T>) {
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if (result.ec == std::errc::result_out_of_range && (__builtin_isinf(value) || value == 0))
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result.ec = {};
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}
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if (result.ec != std::errc {})
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return {};
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return ParseFirstNumberResult { value, static_cast<size_t>(result.ptr - begin) };
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}
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#define __ENUMERATE_TYPE(type) \
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template Optional<ParseFirstNumberResult<type>> parse_first_number(StringView, TrimWhitespace, int);
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ENUMERATE_ARITHMETIC_TYPES
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#undef __ENUMERATE_TYPE
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template<Arithmetic T>
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Optional<T> parse_number(StringView string, TrimWhitespace trim_whitespace, int base)
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{
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if (trim_whitespace == TrimWhitespace::Yes)
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string = StringUtils::trim_whitespace(string, TrimMode::Both);
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auto result = parse_first_number<T>(string, TrimWhitespace::No, base);
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if (!result.has_value())
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return {};
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if (result->characters_parsed != string.length())
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return {};
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return result->value;
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}
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#define __ENUMERATE_TYPE(type) \
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template Optional<type> parse_number(StringView, TrimWhitespace, int);
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ENUMERATE_ARITHMETIC_TYPES
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#undef __ENUMERATE_TYPE
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template<Integral T>
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Optional<T> parse_hexadecimal_number(StringView string, TrimWhitespace trim_whitespace)
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{
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return parse_number<T>(string, trim_whitespace, 16);
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}
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#define __ENUMERATE_TYPE(type) \
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template Optional<type> parse_hexadecimal_number(StringView, TrimWhitespace);
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ENUMERATE_INTEGRAL_TYPES
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#undef __ENUMERATE_TYPE
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}
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