931 lines
31 KiB
C++
931 lines
31 KiB
C++
//# This file is a part of toml++ and is subject to the the terms of the MIT license.
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//# Copyright (c) 2019-2020 Mark Gillard <mark.gillard@outlook.com.au>
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//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
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// SPDX-License-Identifier: MIT
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#pragma once
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#include "toml_node.h"
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#include "toml_print_to_stream.h"
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#ifndef DOXYGEN
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#if TOML_WINDOWS_COMPAT
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#define TOML_SA_VALUE_MESSAGE_WSTRING TOML_SA_LIST_SEP "std::wstring"
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#else
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#define TOML_SA_VALUE_MESSAGE_WSTRING
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#endif
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#ifdef __cpp_lib_char8_t
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#define TOML_SA_VALUE_MESSAGE_U8STRING_VIEW TOML_SA_LIST_SEP "std::u8string_view"
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#define TOML_SA_VALUE_MESSAGE_CONST_CHAR8 TOML_SA_LIST_SEP "const char8_t*"
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#else
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#define TOML_SA_VALUE_MESSAGE_U8STRING_VIEW
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#define TOML_SA_VALUE_MESSAGE_CONST_CHAR8
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#endif
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#define TOML_SA_VALUE_EXACT_FUNC_MESSAGE(type_arg) \
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"The " type_arg " must be one of:" \
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TOML_SA_LIST_NEW "A native TOML value type" \
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TOML_SA_NATIVE_VALUE_TYPE_LIST \
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\
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TOML_SA_LIST_NXT "A non-view type capable of losslessly representing a native TOML value type" \
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TOML_SA_LIST_BEG "std::string" \
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TOML_SA_VALUE_MESSAGE_WSTRING \
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TOML_SA_LIST_SEP "any signed integer type >= 64 bits" \
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TOML_SA_LIST_SEP "any floating-point type >= 64 bits" \
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TOML_SA_LIST_END \
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\
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TOML_SA_LIST_NXT "An immutable view type not requiring additional temporary storage" \
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TOML_SA_LIST_BEG "std::string_view" \
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TOML_SA_VALUE_MESSAGE_U8STRING_VIEW \
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TOML_SA_LIST_SEP "const char*" \
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TOML_SA_VALUE_MESSAGE_CONST_CHAR8 \
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TOML_SA_LIST_END
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#define TOML_SA_VALUE_FUNC_MESSAGE(type_arg) \
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"The " type_arg " must be one of:" \
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TOML_SA_LIST_NEW "A native TOML value type" \
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TOML_SA_NATIVE_VALUE_TYPE_LIST \
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\
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TOML_SA_LIST_NXT "A non-view type capable of losslessly representing a native TOML value type" \
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TOML_SA_LIST_BEG "std::string" \
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TOML_SA_VALUE_MESSAGE_WSTRING \
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TOML_SA_LIST_SEP "any signed integer type >= 64 bits" \
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TOML_SA_LIST_SEP "any floating-point type >= 64 bits" \
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TOML_SA_LIST_END \
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\
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TOML_SA_LIST_NXT "A non-view type capable of (reasonably) representing a native TOML value type" \
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TOML_SA_LIST_BEG "any other integer type" \
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TOML_SA_LIST_SEP "any floating-point type >= 32 bits" \
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TOML_SA_LIST_END \
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\
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TOML_SA_LIST_NXT "An immutable view type not requiring additional temporary storage" \
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TOML_SA_LIST_BEG "std::string_view" \
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TOML_SA_VALUE_MESSAGE_U8STRING_VIEW \
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TOML_SA_LIST_SEP "const char*" \
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TOML_SA_VALUE_MESSAGE_CONST_CHAR8 \
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TOML_SA_LIST_END
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#endif // !DOXYGEN
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TOML_PUSH_WARNINGS
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TOML_DISABLE_ARITHMETIC_WARNINGS
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TOML_IMPL_NAMESPACE_START
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{
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template <typename T, typename...>
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struct native_value_maker
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{
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template <typename... Args>
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[[nodiscard]]
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static T make(Args&&... args) noexcept(std::is_nothrow_constructible_v<T, Args&&...>)
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{
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return T(std::forward<Args>(args)...);
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}
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};
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template <typename T>
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struct native_value_maker<T, T>
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{
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template <typename U>
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[[nodiscard]]
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TOML_ALWAYS_INLINE
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static U&& make(U&& val) noexcept
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{
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return std::forward<U>(val);
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}
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};
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#if defined(__cpp_lib_char8_t) || TOML_WINDOWS_COMPAT
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struct string_maker
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{
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template <typename T>
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[[nodiscard]]
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static std::string make(T&& arg) noexcept
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{
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#ifdef __cpp_lib_char8_t
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if constexpr (is_one_of<std::decay_t<T>, char8_t*, const char8_t*>)
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return std::string(reinterpret_cast<const char*>(static_cast<const char8_t*>(arg)));
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else if constexpr (is_one_of<remove_cvref_t<T>, std::u8string, std::u8string_view>)
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return std::string(reinterpret_cast<const char*>(static_cast<const char8_t*>(arg.data())), arg.length());
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#endif // __cpp_lib_char8_t
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#if TOML_WINDOWS_COMPAT
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if constexpr (is_wide_string<T>)
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return narrow(std::forward<T>(arg));
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#endif // TOML_WINDOWS_COMPAT
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}
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};
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#ifdef __cpp_lib_char8_t
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template <> struct native_value_maker<std::string, char8_t*> : string_maker {};
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template <> struct native_value_maker<std::string, const char8_t*> : string_maker {};
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template <> struct native_value_maker<std::string, std::u8string> : string_maker {};
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template <> struct native_value_maker<std::string, std::u8string_view> : string_maker {};
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#endif // __cpp_lib_char8_t
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#if TOML_WINDOWS_COMPAT
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template <> struct native_value_maker<std::string, wchar_t*> : string_maker {};
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template <> struct native_value_maker<std::string, const wchar_t*> : string_maker {};
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template <> struct native_value_maker<std::string, std::wstring> : string_maker {};
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template <> struct native_value_maker<std::string, std::wstring_view> : string_maker {};
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#endif // TOML_WINDOWS_COMPAT
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#endif // defined(__cpp_lib_char8_t) || TOML_WINDOWS_COMPAT
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template <typename T>
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[[nodiscard]]
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TOML_ATTR(const)
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inline optional<T> node_integer_cast(int64_t val) noexcept
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{
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static_assert(node_type_of<T> == node_type::integer);
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static_assert(!is_cvref<T>);
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using traits = value_traits<T>;
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if constexpr (!traits::is_signed)
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{
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if constexpr ((sizeof(T) * CHAR_BIT) < 63) // 63 bits == int64_max
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{
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using common_t = decltype(int64_t{} + T{});
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if (val < int64_t{} || static_cast<common_t>(val) > static_cast<common_t>(traits::max))
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return {};
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}
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else
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{
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if (val < int64_t{})
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return {};
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}
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}
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else
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{
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if (val < traits::min || val > traits::max)
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return {};
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}
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return { static_cast<T>(val) };
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}
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}
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TOML_IMPL_NAMESPACE_END
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TOML_NAMESPACE_START
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{
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/// \brief A TOML value.
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///
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/// \tparam ValueType The value's native TOML data type. Can be one of:
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/// - std::string
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/// - toml::date
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/// - toml::time
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/// - toml::date_time
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/// - int64_t
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/// - double
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/// - bool
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template <typename ValueType>
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class TOML_API value final : public node
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{
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static_assert(
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impl::is_native<ValueType> && !impl::is_cvref<ValueType>,
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"A toml::value<> must model one of the native TOML value types:"
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TOML_SA_NATIVE_VALUE_TYPE_LIST
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);
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private:
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friend class TOML_PARSER_TYPENAME;
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template <typename T, typename U>
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[[nodiscard]]
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TOML_ALWAYS_INLINE
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TOML_ATTR(const)
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static auto as_value([[maybe_unused]] U* ptr) noexcept
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{
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if constexpr (std::is_same_v<value_type, T>)
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return ptr;
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else
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return nullptr;
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}
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ValueType val_;
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value_flags flags_ = value_flags::none;
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#if TOML_LIFETIME_HOOKS
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void lh_ctor() noexcept
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{
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TOML_VALUE_CREATED;
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}
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void lh_dtor() noexcept
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{
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TOML_VALUE_DESTROYED;
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}
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#endif
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public:
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/// \brief The value's underlying data type.
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using value_type = ValueType;
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/// \brief A type alias for 'value arguments'.
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/// \details This differs according to the value's type argument:
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/// - ints, floats, booleans: `value_type`
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/// - strings: `string_view`
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/// - everything else: `const value_type&`
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using value_arg = std::conditional_t<
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std::is_same_v<value_type, std::string>,
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std::string_view,
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std::conditional_t<impl::is_one_of<value_type, double, int64_t, bool>, value_type, const value_type&>
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>;
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/// \brief Constructs a toml value.
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///
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/// \tparam Args Constructor argument types.
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/// \param args Arguments to forward to the internal value's constructor.
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template <typename... Args>
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TOML_NODISCARD_CTOR
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explicit value(Args&&... args)
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noexcept(noexcept(value_type(
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impl::native_value_maker<value_type, std::decay_t<Args>...>::make(std::forward<Args>(args)...)
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)))
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: val_(impl::native_value_maker<value_type, std::decay_t<Args>...>::make(std::forward<Args>(args)...))
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{
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#if TOML_LIFETIME_HOOKS
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lh_ctor();
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#endif
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}
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/// \brief Copy constructor.
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TOML_NODISCARD_CTOR
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value(const value& other) noexcept
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: node{ other },
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val_{ other.val_ },
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flags_{ other.flags_ }
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{
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#if TOML_LIFETIME_HOOKS
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lh_ctor();
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#endif
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}
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/// \brief Move constructor.
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TOML_NODISCARD_CTOR
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value(value&& other) noexcept
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: node{ std::move(other) },
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val_{ std::move(other.val_) },
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flags_{ other.flags_ }
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{
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#if TOML_LIFETIME_HOOKS
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lh_ctor();
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#endif
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}
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/// \brief Copy-assignment operator.
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value& operator= (const value& rhs) noexcept
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{
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node::operator=(rhs);
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val_ = rhs.val_;
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flags_ = rhs.flags_;
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return *this;
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}
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/// \brief Move-assignment operator.
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value& operator= (value&& rhs) noexcept
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{
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if (&rhs != this)
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{
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node::operator=(std::move(rhs));
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val_ = std::move(rhs.val_);
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flags_ = rhs.flags_;
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}
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return *this;
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}
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#if TOML_LIFETIME_HOOKS
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~value() noexcept override
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{
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lh_dtor();
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}
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#endif
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/// \brief Returns the value's node type identifier.
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///
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/// \returns One of:
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/// - node_type::string
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/// - node_type::integer
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/// - node_type::floating_point
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/// - node_type::boolean
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/// - node_type::date
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/// - node_type::time
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/// - node_type::date_time
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[[nodiscard]] node_type type() const noexcept override { return impl::node_type_of<value_type>; }
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[[nodiscard]] bool is_table() const noexcept override { return false; }
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[[nodiscard]] bool is_array() const noexcept override { return false; }
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[[nodiscard]] bool is_value() const noexcept override { return true; }
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[[nodiscard]] bool is_string() const noexcept override { return std::is_same_v<value_type, std::string>; }
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[[nodiscard]] bool is_integer() const noexcept override { return std::is_same_v<value_type, int64_t>; }
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[[nodiscard]] bool is_floating_point() const noexcept override { return std::is_same_v<value_type, double>; }
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[[nodiscard]] bool is_number() const noexcept override { return impl::is_one_of<value_type, int64_t, double>; }
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[[nodiscard]] bool is_boolean() const noexcept override { return std::is_same_v<value_type, bool>; }
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[[nodiscard]] bool is_date() const noexcept override { return std::is_same_v<value_type, date>; }
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[[nodiscard]] bool is_time() const noexcept override { return std::is_same_v<value_type, time>; }
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[[nodiscard]] bool is_date_time() const noexcept override { return std::is_same_v<value_type, date_time>; }
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[[nodiscard]] value<std::string>* as_string() noexcept override { return as_value<std::string>(this); }
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[[nodiscard]] value<int64_t>* as_integer() noexcept override { return as_value<int64_t>(this); }
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[[nodiscard]] value<double>* as_floating_point() noexcept override { return as_value<double>(this); }
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[[nodiscard]] value<bool>* as_boolean() noexcept override { return as_value<bool>(this); }
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[[nodiscard]] value<date>* as_date() noexcept override { return as_value<date>(this); }
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[[nodiscard]] value<time>* as_time() noexcept override { return as_value<time>(this); }
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[[nodiscard]] value<date_time>* as_date_time() noexcept override { return as_value<date_time>(this); }
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[[nodiscard]] const value<std::string>* as_string() const noexcept override { return as_value<std::string>(this); }
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[[nodiscard]] const value<int64_t>* as_integer() const noexcept override { return as_value<int64_t>(this); }
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[[nodiscard]] const value<double>* as_floating_point() const noexcept override { return as_value<double>(this); }
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[[nodiscard]] const value<bool>* as_boolean() const noexcept override { return as_value<bool>(this); }
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[[nodiscard]] const value<date>* as_date() const noexcept override { return as_value<date>(this); }
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[[nodiscard]] const value<time>* as_time() const noexcept override { return as_value<time>(this); }
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[[nodiscard]] const value<date_time>* as_date_time() const noexcept override { return as_value<date_time>(this); }
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[[nodiscard]]
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bool is_homogeneous(node_type ntype) const noexcept override
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{
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return ntype == node_type::none || ntype == impl::node_type_of<value_type>;
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}
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[[nodiscard]]
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bool is_homogeneous(node_type ntype, toml::node*& first_nonmatch) noexcept override
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{
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if (ntype != node_type::none && ntype != impl::node_type_of<value_type>)
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{
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first_nonmatch = this;
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return false;
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}
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return true;
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}
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[[nodiscard]]
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bool is_homogeneous(node_type ntype, const toml::node*& first_nonmatch) const noexcept override
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{
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if (ntype != node_type::none && ntype != impl::node_type_of<value_type>)
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{
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first_nonmatch = this;
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return false;
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}
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return true;
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}
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template <typename ElemType = void>
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[[nodiscard]]
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bool is_homogeneous() const noexcept
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{
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using type = impl::unwrap_node<ElemType>;
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static_assert(
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std::is_void_v<type>
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|| ((impl::is_native<type> || impl::is_one_of<type, table, array>) && !impl::is_cvref<type>),
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"The template type argument of value::is_homogeneous() must be void or one of:"
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TOML_SA_UNWRAPPED_NODE_TYPE_LIST
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);
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using type = impl::unwrap_node<ElemType>;
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if constexpr (std::is_void_v<type>)
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return true;
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else
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return impl::node_type_of<type> == impl::node_type_of<value_type>;
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}
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/// \brief Returns a reference to the underlying value.
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[[nodiscard]] value_type& get() & noexcept { return val_; }
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/// \brief Returns a reference to the underlying value (rvalue overload).
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[[nodiscard]] value_type&& get() && noexcept { return std::move(val_); }
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/// \brief Returns a reference to the underlying value (const overload).
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[[nodiscard]] const value_type& get() const & noexcept { return val_; }
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/// \brief Returns a reference to the underlying value.
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[[nodiscard]] value_type& operator* () & noexcept { return val_; }
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/// \brief Returns a reference to the underlying value (rvalue overload).
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[[nodiscard]] value_type&& operator* () && noexcept { return std::move(val_); }
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/// \brief Returns a reference to the underlying value (const overload).
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[[nodiscard]] const value_type& operator* () const& noexcept { return val_; }
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/// \brief Returns a reference to the underlying value.
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[[nodiscard]] explicit operator value_type& () & noexcept { return val_; }
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/// \brief Returns a reference to the underlying value (rvalue overload).
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[[nodiscard]] explicit operator value_type && () && noexcept { return std::move(val_); }
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/// \brief Returns a reference to the underlying value (const overload).
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[[nodiscard]] explicit operator const value_type& () const& noexcept { return val_; }
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/// \brief Returns the metadata flags associated with this value.
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[[nodiscard]] value_flags flags() const noexcept
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{
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return flags_;
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}
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/// \brief Sets the metadata flags associated with this value.
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/// \returns A reference to the value object.
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value& flags(value_flags new_flags) noexcept
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{
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flags_ = new_flags;
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return *this;
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}
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/// \brief Prints the value out to a stream as formatted TOML.
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template <typename Char, typename T>
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friend std::basic_ostream<Char>& operator << (std::basic_ostream<Char>& lhs, const value<T>& rhs);
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// implemented in toml_default_formatter.h
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/// \brief Value-assignment operator.
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value& operator= (value_arg rhs) noexcept
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{
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if constexpr (std::is_same_v<value_type, std::string>)
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val_.assign(rhs);
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else
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val_ = rhs;
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return *this;
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}
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template <typename T = value_type, typename = std::enable_if_t<std::is_same_v<T, std::string>>>
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value& operator= (std::string&& rhs) noexcept
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{
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val_ = std::move(rhs);
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return *this;
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}
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/// \brief Value equality operator.
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[[nodiscard]]
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friend bool operator == (const value& lhs, value_arg rhs) noexcept
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{
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if constexpr (std::is_same_v<value_type, double>)
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{
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const auto lhs_class = impl::fpclassify(lhs.val_);
|
|
const auto rhs_class = impl::fpclassify(rhs);
|
|
if (lhs_class == impl::fp_class::nan && rhs_class == impl::fp_class::nan)
|
|
return true;
|
|
if ((lhs_class == impl::fp_class::nan) != (rhs_class == impl::fp_class::nan))
|
|
return false;
|
|
}
|
|
return lhs.val_ == rhs;
|
|
}
|
|
TOML_ASYMMETRICAL_EQUALITY_OPS(const value&, value_arg, )
|
|
|
|
/// \brief Value less-than operator.
|
|
[[nodiscard]] friend bool operator < (const value& lhs, value_arg rhs) noexcept { return lhs.val_ < rhs; }
|
|
/// \brief Value less-than operator.
|
|
[[nodiscard]] friend bool operator < (value_arg lhs, const value& rhs) noexcept { return lhs < rhs.val_; }
|
|
/// \brief Value less-than-or-equal-to operator.
|
|
[[nodiscard]] friend bool operator <= (const value& lhs, value_arg rhs) noexcept { return lhs.val_ <= rhs; }
|
|
/// \brief Value less-than-or-equal-to operator.
|
|
[[nodiscard]] friend bool operator <= (value_arg lhs, const value& rhs) noexcept { return lhs <= rhs.val_; }
|
|
|
|
/// \brief Value greater-than operator.
|
|
[[nodiscard]] friend bool operator > (const value& lhs, value_arg rhs) noexcept { return lhs.val_ > rhs; }
|
|
/// \brief Value greater-than operator.
|
|
[[nodiscard]] friend bool operator > (value_arg lhs, const value& rhs) noexcept { return lhs > rhs.val_; }
|
|
/// \brief Value greater-than-or-equal-to operator.
|
|
[[nodiscard]] friend bool operator >= (const value& lhs, value_arg rhs) noexcept { return lhs.val_ >= rhs; }
|
|
/// \brief Value greater-than-or-equal-to operator.
|
|
[[nodiscard]] friend bool operator >= (value_arg lhs, const value& rhs) noexcept { return lhs >= rhs.val_; }
|
|
|
|
/// \brief Equality operator.
|
|
///
|
|
/// \param lhs The LHS value.
|
|
/// \param rhs The RHS value.
|
|
///
|
|
/// \returns True if the values were of the same type and contained the same value.
|
|
template <typename T>
|
|
[[nodiscard]]
|
|
friend bool operator == (const value& lhs, const value<T>& rhs) noexcept
|
|
{
|
|
if constexpr (std::is_same_v<value_type, T>)
|
|
return lhs == rhs.val_; //calls asymmetrical value-equality operator defined above
|
|
else
|
|
return false;
|
|
}
|
|
|
|
/// \brief Inequality operator.
|
|
///
|
|
/// \param lhs The LHS value.
|
|
/// \param rhs The RHS value.
|
|
///
|
|
/// \returns True if the values were not of the same type, or did not contain the same value.
|
|
template <typename T>
|
|
[[nodiscard]]
|
|
friend bool operator != (const value& lhs, const value<T>& rhs) noexcept
|
|
{
|
|
return !(lhs == rhs);
|
|
}
|
|
|
|
/// \brief Less-than operator.
|
|
///
|
|
/// \param lhs The LHS toml::value.
|
|
/// \param rhs The RHS toml::value.
|
|
///
|
|
/// \returns <strong><em>Same value types:</em></strong> `lhs.get() < rhs.get()` <br>
|
|
/// <strong><em>Different value types:</em></strong> `lhs.type() < rhs.type()`
|
|
template <typename T>
|
|
[[nodiscard]]
|
|
friend bool operator < (const value& lhs, const value<T>& rhs) noexcept
|
|
{
|
|
if constexpr (std::is_same_v<value_type, T>)
|
|
return lhs.val_ < rhs.val_;
|
|
else
|
|
return impl::node_type_of<value_type> < impl::node_type_of<T>;
|
|
}
|
|
|
|
/// \brief Less-than-or-equal-to operator.
|
|
///
|
|
/// \param lhs The LHS toml::value.
|
|
/// \param rhs The RHS toml::value.
|
|
///
|
|
/// \returns <strong><em>Same value types:</em></strong> `lhs.get() <= rhs.get()` <br>
|
|
/// <strong><em>Different value types:</em></strong> `lhs.type() <= rhs.type()`
|
|
template <typename T>
|
|
[[nodiscard]]
|
|
friend bool operator <= (const value& lhs, const value<T>& rhs) noexcept
|
|
{
|
|
if constexpr (std::is_same_v<value_type, T>)
|
|
return lhs.val_ <= rhs.val_;
|
|
else
|
|
return impl::node_type_of<value_type> <= impl::node_type_of<T>;
|
|
}
|
|
|
|
/// \brief Greater-than operator.
|
|
///
|
|
/// \param lhs The LHS toml::value.
|
|
/// \param rhs The RHS toml::value.
|
|
///
|
|
/// \returns <strong><em>Same value types:</em></strong> `lhs.get() > rhs.get()` <br>
|
|
/// <strong><em>Different value types:</em></strong> `lhs.type() > rhs.type()`
|
|
template <typename T>
|
|
[[nodiscard]]
|
|
friend bool operator > (const value& lhs, const value<T>& rhs) noexcept
|
|
{
|
|
if constexpr (std::is_same_v<value_type, T>)
|
|
return lhs.val_ > rhs.val_;
|
|
else
|
|
return impl::node_type_of<value_type> > impl::node_type_of<T>;
|
|
}
|
|
|
|
/// \brief Greater-than-or-equal-to operator.
|
|
///
|
|
/// \param lhs The LHS toml::value.
|
|
/// \param rhs The RHS toml::value.
|
|
///
|
|
/// \returns <strong><em>Same value types:</em></strong> `lhs.get() >= rhs.get()` <br>
|
|
/// <strong><em>Different value types:</em></strong> `lhs.type() >= rhs.type()`
|
|
template <typename T>
|
|
[[nodiscard]]
|
|
friend bool operator >= (const value& lhs, const value<T>& rhs) noexcept
|
|
{
|
|
if constexpr (std::is_same_v<value_type, T>)
|
|
return lhs.val_ >= rhs.val_;
|
|
else
|
|
return impl::node_type_of<value_type> >= impl::node_type_of<T>;
|
|
}
|
|
};
|
|
template <typename T>
|
|
value(T) -> value<impl::native_type_of<impl::remove_cvref_t<T>>>;
|
|
|
|
#ifndef DOXYGEN
|
|
TOML_PUSH_WARNINGS
|
|
TOML_DISABLE_INIT_WARNINGS
|
|
TOML_DISABLE_SWITCH_WARNINGS
|
|
|
|
#if !TOML_HEADER_ONLY
|
|
extern template class TOML_API value<std::string>;
|
|
extern template class TOML_API value<int64_t>;
|
|
extern template class TOML_API value<double>;
|
|
extern template class TOML_API value<bool>;
|
|
extern template class TOML_API value<date>;
|
|
extern template class TOML_API value<time>;
|
|
extern template class TOML_API value<date_time>;
|
|
#endif
|
|
|
|
template <typename T>
|
|
[[nodiscard]]
|
|
inline decltype(auto) node::get_value_exact() const noexcept
|
|
{
|
|
using namespace impl;
|
|
|
|
static_assert(node_type_of<T> != node_type::none);
|
|
static_assert(node_type_of<T> != node_type::table);
|
|
static_assert(node_type_of<T> != node_type::array);
|
|
static_assert(is_native<T> || can_represent_native<T>);
|
|
static_assert(!is_cvref<T>);
|
|
TOML_ASSERT(this->type() == node_type_of<T>);
|
|
|
|
if constexpr (node_type_of<T> == node_type::string)
|
|
{
|
|
const auto& str = *ref_cast<std::string>();
|
|
if constexpr (std::is_same_v<T, std::string>)
|
|
return str;
|
|
else if constexpr (std::is_same_v<T, std::string_view>)
|
|
return T{ str };
|
|
else if constexpr (std::is_same_v<T, const char*>)
|
|
return str.c_str();
|
|
|
|
else if constexpr (std::is_same_v<T, std::wstring>)
|
|
{
|
|
#if TOML_WINDOWS_COMPAT
|
|
return widen(str);
|
|
#else
|
|
static_assert(dependent_false<T>, "Evaluated unreachable branch!");
|
|
#endif
|
|
}
|
|
|
|
#ifdef __cpp_lib_char8_t
|
|
|
|
// char -> char8_t (potentially unsafe - the feature is 'experimental'!)
|
|
else if constexpr (is_one_of<T, std::u8string, std::u8string_view>)
|
|
return T(reinterpret_cast<const char8_t*>(str.c_str()), str.length());
|
|
else if constexpr (std::is_same_v<T, const char8_t*>)
|
|
return reinterpret_cast<const char8_t*>(str.c_str());
|
|
else
|
|
static_assert(dependent_false<T>, "Evaluated unreachable branch!");
|
|
|
|
#endif
|
|
}
|
|
else
|
|
return static_cast<T>(*ref_cast<native_type_of<T>>());
|
|
}
|
|
|
|
template <typename T>
|
|
inline optional<T> node::value_exact() const noexcept
|
|
{
|
|
using namespace impl;
|
|
|
|
static_assert(
|
|
!is_wide_string<T> || TOML_WINDOWS_COMPAT,
|
|
"Retrieving values as wide-character strings with node::value_exact() is only "
|
|
"supported on Windows with TOML_WINDOWS_COMPAT enabled."
|
|
);
|
|
|
|
static_assert(
|
|
(is_native<T> || can_represent_native<T>) && !is_cvref<T>,
|
|
TOML_SA_VALUE_EXACT_FUNC_MESSAGE("return type of node::value_exact()")
|
|
);
|
|
|
|
// prevent additional compiler error spam when the static_assert fails by gating behind if constexpr
|
|
if constexpr ((is_native<T> || can_represent_native<T>) && !is_cvref<T>)
|
|
{
|
|
if (type() == node_type_of<T>)
|
|
return { this->get_value_exact<T>() };
|
|
else
|
|
return {};
|
|
}
|
|
}
|
|
|
|
template <typename T>
|
|
inline optional<T> node::value() const noexcept
|
|
{
|
|
using namespace impl;
|
|
|
|
static_assert(
|
|
!is_wide_string<T> || TOML_WINDOWS_COMPAT,
|
|
"Retrieving values as wide-character strings with node::value() is only "
|
|
"supported on Windows with TOML_WINDOWS_COMPAT enabled."
|
|
);
|
|
static_assert(
|
|
(is_native<T> || can_represent_native<T> || can_partially_represent_native<T>) && !is_cvref<T>,
|
|
TOML_SA_VALUE_FUNC_MESSAGE("return type of node::value()")
|
|
);
|
|
|
|
// when asking for strings, dates, times and date_times there's no 'fuzzy' conversion
|
|
// semantics to be mindful of so the exact retrieval is enough.
|
|
if constexpr (is_natively_one_of<T, std::string, time, date, date_time>)
|
|
{
|
|
if (type() == node_type_of<T>)
|
|
return { this->get_value_exact<T>() };
|
|
else
|
|
return {};
|
|
}
|
|
|
|
// everything else requires a bit of logicking.
|
|
else
|
|
{
|
|
switch (type())
|
|
{
|
|
// int -> *
|
|
case node_type::integer:
|
|
{
|
|
// int -> int
|
|
if constexpr (is_natively_one_of<T, int64_t>)
|
|
{
|
|
if constexpr (is_native<T> || can_represent_native<T>)
|
|
return static_cast<T>(*ref_cast<int64_t>());
|
|
else
|
|
return node_integer_cast<T>(*ref_cast<int64_t>());
|
|
}
|
|
|
|
// int -> float
|
|
else if constexpr (is_natively_one_of<T, double>)
|
|
{
|
|
const int64_t val = *ref_cast<int64_t>();
|
|
if constexpr (std::numeric_limits<T>::digits < 64)
|
|
{
|
|
constexpr auto largest_whole_float = (int64_t{ 1 } << std::numeric_limits<T>::digits);
|
|
if (val < -largest_whole_float || val > largest_whole_float)
|
|
return {};
|
|
}
|
|
return static_cast<T>(val);
|
|
}
|
|
|
|
// int -> bool
|
|
else if constexpr (is_natively_one_of<T, bool>)
|
|
return static_cast<bool>(*ref_cast<int64_t>());
|
|
|
|
// int -> anything else
|
|
else
|
|
return {};
|
|
}
|
|
|
|
// float -> *
|
|
case node_type::floating_point:
|
|
{
|
|
// float -> float
|
|
if constexpr (is_natively_one_of<T, double>)
|
|
{
|
|
if constexpr (is_native<T> || can_represent_native<T>)
|
|
return { static_cast<T>(*ref_cast<double>()) };
|
|
else
|
|
{
|
|
const double val = *ref_cast<double>();
|
|
if (val < (std::numeric_limits<T>::lowest)() || val > (std::numeric_limits<T>::max)())
|
|
return {};
|
|
return { static_cast<T>(val) };
|
|
}
|
|
}
|
|
|
|
// float -> int
|
|
else if constexpr (is_natively_one_of<T, int64_t>)
|
|
{
|
|
const double val = *ref_cast<double>();
|
|
if (static_cast<double>(static_cast<int64_t>(val)) == val)
|
|
return node_integer_cast<T>(static_cast<int64_t>(val));
|
|
else
|
|
return {};
|
|
}
|
|
|
|
// float -> anything else
|
|
else
|
|
return {};
|
|
}
|
|
|
|
// bool -> *
|
|
case node_type::boolean:
|
|
{
|
|
// bool -> bool
|
|
if constexpr (is_natively_one_of<T, bool>)
|
|
return { *ref_cast<bool>() };
|
|
|
|
// bool -> int
|
|
else if constexpr (is_natively_one_of<T, int64_t>)
|
|
return { static_cast<T>(*ref_cast<bool>()) };
|
|
|
|
// bool -> anything else
|
|
else
|
|
return {};
|
|
}
|
|
}
|
|
|
|
// non-values, or 'exact' types covered above
|
|
return {};
|
|
}
|
|
}
|
|
|
|
template <typename T>
|
|
inline auto node::value_or(T&& default_value) const noexcept
|
|
{
|
|
using namespace impl;
|
|
|
|
static_assert(
|
|
!is_wide_string<T> || TOML_WINDOWS_COMPAT,
|
|
"Retrieving values as wide-character strings with node::value_or() is only "
|
|
"supported on Windows with TOML_WINDOWS_COMPAT enabled."
|
|
);
|
|
|
|
|
|
if constexpr (is_wide_string<T>)
|
|
{
|
|
#if TOML_WINDOWS_COMPAT
|
|
|
|
if (type() == node_type::string)
|
|
return widen(*ref_cast<std::string>());
|
|
return std::wstring{ std::forward<T>(default_value) };
|
|
|
|
#else
|
|
|
|
static_assert(dependent_false<T>, "Evaluated unreachable branch!");
|
|
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
using value_type = std::conditional_t<
|
|
std::is_pointer_v<std::decay_t<T>>,
|
|
std::add_pointer_t<std::add_const_t<std::remove_pointer_t<std::decay_t<T>>>>,
|
|
std::decay_t<T>
|
|
>;
|
|
using traits = value_traits<value_type>;
|
|
|
|
static_assert(
|
|
traits::is_native || traits::can_represent_native || traits::can_partially_represent_native,
|
|
"The default value type of node::value_or() must be one of:"
|
|
TOML_SA_LIST_NEW "A native TOML value type"
|
|
TOML_SA_NATIVE_VALUE_TYPE_LIST
|
|
|
|
TOML_SA_LIST_NXT "A non-view type capable of losslessly representing a native TOML value type"
|
|
TOML_SA_LIST_BEG "std::string"
|
|
#if TOML_WINDOWS_COMPAT
|
|
TOML_SA_LIST_SEP "std::wstring"
|
|
#endif
|
|
TOML_SA_LIST_SEP "any signed integer type >= 64 bits"
|
|
TOML_SA_LIST_SEP "any floating-point type >= 64 bits"
|
|
TOML_SA_LIST_END
|
|
|
|
TOML_SA_LIST_NXT "A non-view type capable of (reasonably) representing a native TOML value type"
|
|
TOML_SA_LIST_BEG "any other integer type"
|
|
TOML_SA_LIST_SEP "any floating-point type >= 32 bits"
|
|
TOML_SA_LIST_END
|
|
|
|
TOML_SA_LIST_NXT "A compatible view type"
|
|
TOML_SA_LIST_BEG "std::string_view"
|
|
#ifdef __cpp_lib_char8_t
|
|
TOML_SA_LIST_SEP "std::u8string_view"
|
|
#endif
|
|
#if TOML_WINDOWS_COMPAT
|
|
TOML_SA_LIST_SEP "std::wstring_view"
|
|
#endif
|
|
TOML_SA_LIST_SEP "const char*"
|
|
#ifdef __cpp_lib_char8_t
|
|
TOML_SA_LIST_SEP "const char8_t*"
|
|
#endif
|
|
#if TOML_WINDOWS_COMPAT
|
|
TOML_SA_LIST_SEP "const wchar_t*"
|
|
#endif
|
|
TOML_SA_LIST_END
|
|
);
|
|
|
|
// prevent additional compiler error spam when the static_assert fails by gating behind if constexpr
|
|
if constexpr (traits::is_native || traits::can_represent_native || traits::can_partially_represent_native)
|
|
{
|
|
if constexpr (traits::is_native)
|
|
{
|
|
if (type() == node_type_of<value_type>)
|
|
return *ref_cast<typename traits::native_type>();
|
|
}
|
|
if (auto val = this->value<value_type>())
|
|
return *val;
|
|
if constexpr (std::is_pointer_v<value_type>)
|
|
return value_type{ default_value };
|
|
else
|
|
return std::forward<T>(default_value);
|
|
}
|
|
}
|
|
}
|
|
|
|
#if !TOML_HEADER_ONLY
|
|
|
|
#define TOML_EXTERN(name, T) \
|
|
extern template TOML_API optional<T> node::name<T>() const noexcept
|
|
TOML_EXTERN(value_exact, std::string_view);
|
|
TOML_EXTERN(value_exact, std::string);
|
|
TOML_EXTERN(value_exact, const char*);
|
|
TOML_EXTERN(value_exact, int64_t);
|
|
TOML_EXTERN(value_exact, double);
|
|
TOML_EXTERN(value_exact, date);
|
|
TOML_EXTERN(value_exact, time);
|
|
TOML_EXTERN(value_exact, date_time);
|
|
TOML_EXTERN(value_exact, bool);
|
|
TOML_EXTERN(value, std::string_view);
|
|
TOML_EXTERN(value, std::string);
|
|
TOML_EXTERN(value, const char*);
|
|
TOML_EXTERN(value, signed char);
|
|
TOML_EXTERN(value, signed short);
|
|
TOML_EXTERN(value, signed int);
|
|
TOML_EXTERN(value, signed long);
|
|
TOML_EXTERN(value, signed long long);
|
|
TOML_EXTERN(value, unsigned char);
|
|
TOML_EXTERN(value, unsigned short);
|
|
TOML_EXTERN(value, unsigned int);
|
|
TOML_EXTERN(value, unsigned long);
|
|
TOML_EXTERN(value, unsigned long long);
|
|
TOML_EXTERN(value, double);
|
|
TOML_EXTERN(value, float);
|
|
TOML_EXTERN(value, date);
|
|
TOML_EXTERN(value, time);
|
|
TOML_EXTERN(value, date_time);
|
|
TOML_EXTERN(value, bool);
|
|
#ifdef __cpp_lib_char8_t
|
|
TOML_EXTERN(value_exact, std::u8string_view);
|
|
TOML_EXTERN(value_exact, std::u8string);
|
|
TOML_EXTERN(value_exact, const char8_t*);
|
|
TOML_EXTERN(value, std::u8string_view);
|
|
TOML_EXTERN(value, std::u8string);
|
|
TOML_EXTERN(value, const char8_t*);
|
|
#endif
|
|
#if TOML_WINDOWS_COMPAT
|
|
TOML_EXTERN(value_exact, std::wstring);
|
|
TOML_EXTERN(value, std::wstring);
|
|
#endif
|
|
#undef TOML_EXTERN
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#endif // !TOML_HEADER_ONLY
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TOML_POP_WARNINGS // TOML_DISABLE_INIT_WARNINGS, TOML_DISABLE_SWITCH_WARNINGS
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#endif // !DOXYGEN
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}
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TOML_NAMESPACE_END
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TOML_POP_WARNINGS // TOML_DISABLE_ARITHMETIC_WARNINGS
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