mirror of
https://github.com/marzer/tomlplusplus.git
synced 2024-10-06 23:09:56 +00:00
537eb30080
also: - fixed parsing table headers allowing invalid characters - fixed implicit fallthrough warnings - fixed some issues parsing dates and times - added `table::erase` - added `array::operator[]` - added `value::operator*` - added stream operators for date, time and date_time - added `impl::print_to_stream` - added more parsing diagnostics - added many tests
287 lines
8.9 KiB
C++
287 lines
8.9 KiB
C++
#pragma once
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#include "toml_common.h"
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namespace toml::impl
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{
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// Q: "why does print_to_stream() exist? why not just use ostream::write(), ostream::put() etc?"
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// A: - I'm supporting C++20's char8_t as well; wrapping streams allows switching string modes transparently.
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// - <charconv> is locale-independent.
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// - I can avoid forcing users to drag in <sstream> and <iomanip>.
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template <typename CHAR1, typename CHAR2>
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TOML_ALWAYS_INLINE
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void print_to_stream(std::basic_string_view<CHAR1> str, std::basic_ostream<CHAR2>& stream) TOML_MAY_THROW
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{
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static_assert(sizeof(CHAR1) == 1);
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static_assert(sizeof(CHAR2) == 1);
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stream.write(str.data(), str.length());
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}
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template <typename CHAR1, typename CHAR2>
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TOML_ALWAYS_INLINE
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void print_to_stream(const std::basic_string<CHAR1>& str, std::basic_ostream<CHAR2>& stream) TOML_MAY_THROW
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{
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static_assert(sizeof(CHAR1) == 1);
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static_assert(sizeof(CHAR2) == 1);
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stream.write(str.data(), str.length());
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}
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template <typename CHAR>
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TOML_ALWAYS_INLINE
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void print_to_stream(char character, std::basic_ostream<CHAR>& stream) TOML_MAY_THROW
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{
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static_assert(sizeof(CHAR) == 1);
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stream.put(static_cast<CHAR>(character));
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}
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template <typename CHAR>
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TOML_GCC_ATTR(nonnull) TOML_ALWAYS_INLINE
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void print_to_stream(const char* str, size_t len, std::basic_ostream<CHAR>& stream) TOML_MAY_THROW
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{
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static_assert(sizeof(CHAR) == 1);
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stream.write(reinterpret_cast<const CHAR*>(str), static_cast<std::streamsize>(len));
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}
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#if defined(__cpp_lib_char8_t)
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template <typename CHAR>
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TOML_ALWAYS_INLINE
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void print_to_stream(char8_t character, std::basic_ostream<CHAR>& stream) TOML_MAY_THROW
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{
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static_assert(sizeof(CHAR) == 1);
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stream.put(static_cast<CHAR>(character));
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}
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template <typename CHAR>
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TOML_GCC_ATTR(nonnull) TOML_ALWAYS_INLINE
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void print_to_stream(const char8_t* str, size_t len, std::basic_ostream<CHAR>& stream) TOML_MAY_THROW
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{
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static_assert(sizeof(CHAR) == 1);
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stream.write(reinterpret_cast<const CHAR*>(str), static_cast<std::streamsize>(len));
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}
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#endif
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template <typename T> inline constexpr size_t charconv_buffer_length = 0;
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template <> inline constexpr size_t charconv_buffer_length<double> = 60;
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template <> inline constexpr size_t charconv_buffer_length<float> = 40;
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template <> inline constexpr size_t charconv_buffer_length<uint64_t> = 20; //strlen("18446744073709551615")
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template <> inline constexpr size_t charconv_buffer_length<int64_t> = 20; //strlen("-9223372036854775808")
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template <> inline constexpr size_t charconv_buffer_length<int32_t> = 11; //strlen("-2147483648")
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template <> inline constexpr size_t charconv_buffer_length<int16_t> = 6; //strlen("-32768")
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template <> inline constexpr size_t charconv_buffer_length<int8_t> = 4; //strlen("-128")
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template <> inline constexpr size_t charconv_buffer_length<uint32_t> = 10; //strlen("4294967295")
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template <> inline constexpr size_t charconv_buffer_length<uint16_t> = 5; //strlen("65535")
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template <> inline constexpr size_t charconv_buffer_length<uint8_t> = 3; //strlen("255")
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template <typename T, typename CHAR>
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inline void print_integer_to_stream(T val, std::basic_ostream<CHAR>& stream) TOML_MAY_THROW
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{
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static_assert(
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sizeof(CHAR) == 1,
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"The stream's underlying character type must be 1 byte in size."
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);
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TOML_GCC_ATTR(uninitialized) char buf[charconv_buffer_length<T>];
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const auto res = std::to_chars(buf, buf + sizeof(buf), val);
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print_to_stream(buf, static_cast<size_t>(res.ptr - buf), stream);
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}
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#define TOML_P2S_OVERLOAD(type) \
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template <typename CHAR> \
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TOML_ALWAYS_INLINE \
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void print_to_stream(type val, std::basic_ostream<CHAR>& stream) TOML_MAY_THROW \
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{ \
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static_assert(sizeof(CHAR) == 1); \
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print_integer_to_stream(val, stream); \
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}
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TOML_P2S_OVERLOAD(int8_t)
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TOML_P2S_OVERLOAD(int16_t)
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TOML_P2S_OVERLOAD(int32_t)
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TOML_P2S_OVERLOAD(int64_t)
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TOML_P2S_OVERLOAD(uint8_t)
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TOML_P2S_OVERLOAD(uint16_t)
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TOML_P2S_OVERLOAD(uint32_t)
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TOML_P2S_OVERLOAD(uint64_t)
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#undef TOML_P2S_OVERLOAD
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template <typename T, typename CHAR>
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inline void print_floating_point_to_stream(T val, std::basic_ostream<CHAR>& stream) TOML_MAY_THROW
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{
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static_assert(
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sizeof(CHAR) == 1,
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"The stream's underlying character type must be 1 byte in size."
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);
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static constexpr auto needs_decimal_point = [](auto&& s) noexcept
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{
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for (auto c : s)
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if (c == '.' || c == 'E' || c == 'e')
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return false;
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return true;
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};
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#if TOML_USE_STREAMS_FOR_FLOATS
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{
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std::ostringstream oss;
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oss << val;
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const auto str = oss.str();
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print_to_stream(str, stream);
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if (needs_decimal_point(str))
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print_to_stream(".0"sv, stream);
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}
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#else
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{
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TOML_GCC_ATTR(uninitialized) char buf[charconv_buffer_length<T>];
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const auto res = std::to_chars(buf, buf + sizeof(buf), val);
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const auto str = std::string_view{ buf, static_cast<size_t>(res.ptr - buf) };
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print_to_stream(str, stream);
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if (needs_decimal_point(str))
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print_to_stream(".0"sv, stream);
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}
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#endif
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}
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#define TOML_P2S_OVERLOAD(type) \
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template <typename CHAR> \
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TOML_ALWAYS_INLINE \
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void print_to_stream(type val, std::basic_ostream<CHAR>& stream) TOML_MAY_THROW \
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{ \
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static_assert(sizeof(CHAR) == 1); \
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print_floating_point_to_stream(val, stream); \
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}
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TOML_P2S_OVERLOAD(float)
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TOML_P2S_OVERLOAD(double)
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#undef TOML_P2S_OVERLOAD
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template <typename CHAR>
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TOML_ALWAYS_INLINE
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void print_to_stream(bool& val, std::basic_ostream<CHAR>& stream) TOML_MAY_THROW
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{
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static_assert(sizeof(CHAR) == 1);
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print_to_stream(val ? "true"sv : "false"sv, stream);
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}
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template <typename T, typename CHAR>
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inline void print_to_stream(T val, std::basic_ostream<CHAR>& stream, size_t zero_pad_to_digits) TOML_MAY_THROW
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{
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static_assert(sizeof(CHAR) == 1);
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TOML_GCC_ATTR(uninitialized) char buf[charconv_buffer_length<T>];
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const auto res = std::to_chars(buf, buf + sizeof(buf), val);
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const auto len = static_cast<size_t>(res.ptr - buf);
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for (size_t i = len; i < zero_pad_to_digits; i++)
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print_to_stream('0', stream);
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print_to_stream(buf, static_cast<size_t>(res.ptr - buf), stream);
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}
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template <typename CHAR>
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inline void print_to_stream(const toml::date& val, std::basic_ostream<CHAR>& stream) TOML_MAY_THROW
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{
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static_assert(sizeof(CHAR) == 1);
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print_to_stream(val.year, stream, 4_sz);
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print_to_stream('-', stream);
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print_to_stream(val.month, stream, 2_sz);
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print_to_stream('-', stream);
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print_to_stream(val.day, stream, 2_sz);
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}
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template <typename CHAR>
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inline void print_to_stream(const toml::time& val, std::basic_ostream<CHAR>& stream) TOML_MAY_THROW
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{
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static_assert(sizeof(CHAR) == 1);
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print_to_stream(val.hour, stream, 2_sz);
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print_to_stream(':', stream);
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print_to_stream(val.minute, stream, 2_sz);
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print_to_stream(':', stream);
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print_to_stream(val.second, stream, 2_sz);
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if (val.nanosecond && val.nanosecond <= 999999999u)
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{
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print_to_stream('.', stream);
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auto ns = val.nanosecond;
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size_t digits = 9_sz;
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while (ns % 10u == 0u)
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{
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ns /= 10u;
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digits--;
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}
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print_to_stream(ns, stream, digits);
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}
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}
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template <typename CHAR>
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inline void print_to_stream(const toml::time_offset& val, std::basic_ostream<CHAR>& stream) TOML_MAY_THROW
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{
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static_assert(sizeof(CHAR) == 1);
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if (!val.minutes)
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print_to_stream('Z', stream);
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else
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{
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auto mins = static_cast<int>(val.minutes);
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if (mins < 0)
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{
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print_to_stream('-', stream);
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mins = -mins;
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}
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else
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print_to_stream('+', stream);
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const auto hours = mins / 60;
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if (hours)
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{
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print_to_stream(static_cast<unsigned int>(hours), stream, 2_sz);
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mins -= hours * 60;
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}
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else
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print_to_stream("00"sv, stream);
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print_to_stream(':', stream);
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print_to_stream(static_cast<unsigned int>(mins), stream, 2_sz);
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}
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}
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template <typename CHAR>
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inline void print_to_stream(const toml::date_time& val, std::basic_ostream<CHAR>& stream) TOML_MAY_THROW
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{
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static_assert(sizeof(CHAR) == 1);
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print_to_stream(val.date, stream);
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print_to_stream('T', stream);
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print_to_stream(val.time, stream);
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if (val.time_offset)
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print_to_stream(*val.time_offset, stream);
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}
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}
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namespace toml
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{
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template <typename CHAR>
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inline std::basic_ostream<CHAR>& operator << (std::basic_ostream<CHAR>& lhs, const date& rhs) TOML_MAY_THROW
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{
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impl::print_to_stream(rhs, lhs);
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return lhs;
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}
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template <typename CHAR>
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inline std::basic_ostream<CHAR>& operator << (std::basic_ostream<CHAR>& lhs, const time& rhs) TOML_MAY_THROW
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{
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impl::print_to_stream(rhs, lhs);
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return lhs;
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}
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template <typename CHAR>
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inline std::basic_ostream<CHAR>& operator << (std::basic_ostream<CHAR>& lhs, const time_offset& rhs) TOML_MAY_THROW
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{
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impl::print_to_stream(rhs, lhs);
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return lhs;
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}
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template <typename CHAR>
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inline std::basic_ostream<CHAR>& operator << (std::basic_ostream<CHAR>& lhs, const date_time& rhs) TOML_MAY_THROW
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{
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impl::print_to_stream(rhs, lhs);
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return lhs;
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}
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}
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