488 lines
18 KiB
C++
488 lines
18 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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TOML_PUSH_WARNINGS
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TOML_DISABLE_FLOAT_WARNINGS
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TOML_DISABLE_PADDING_WARNINGS
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namespace toml
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{
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template <typename Char, typename T>
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std::basic_ostream<Char>& operator << (std::basic_ostream<Char>&, const value<T>&);
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/// \brief A TOML value.
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///
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/// \tparam T The value's data type. Can be one of:
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/// - toml::string
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/// - int64_t
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/// - double
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/// - bool
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/// - toml::date
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/// - toml::time
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/// - toml::date_time
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template <typename T>
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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_value<T>,
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"Template type parameter must be one of the TOML value types"
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);
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private:
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friend class TOML_PARSER_TYPENAME;
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template <typename U, typename V>
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[[nodiscard]] TOML_ALWAYS_INLINE
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static auto as_value([[maybe_unused]] V* ptr) noexcept
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{
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if constexpr (std::is_same_v<T, U>)
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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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T val_;
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public:
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/// \brief The value's underlying data type.
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using value_type = T;
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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<T, string>,
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string_view,
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std::conditional_t<impl::is_one_of<T, double, int64_t, bool>, T, const T&>
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>;
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/// \brief Constructs a toml value.
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///
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/// \tparam U Constructor argument types.
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/// \param args Arguments to forward to the internal value's constructor.
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template <typename... U>
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TOML_NODISCARD_CTOR
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explicit value(U&&... args) noexcept(std::is_nothrow_constructible_v<T, U&&...>)
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: val_{ std::forward<U>(args)... }
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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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{}
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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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node::operator=(std::move(rhs));
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val_ = std::move(rhs.val_);
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return *this;
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}
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value(const value&) = delete;
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value& operator= (const value&) = delete;
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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<T>; }
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/// \brief Always returns `false` for value nodes.
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[[nodiscard]] bool is_table() const noexcept override { return false; }
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/// \brief Always returns `false` for value nodes.
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[[nodiscard]] bool is_array() const noexcept override { return false; }
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/// \brief Always returns `true` for value nodes.
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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<T, string>; }
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[[nodiscard]] bool is_integer() const noexcept override { return std::is_same_v<T, int64_t>; }
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[[nodiscard]] bool is_floating_point() const noexcept override { return std::is_same_v<T, double>; }
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[[nodiscard]] bool is_number() const noexcept override { return impl::is_one_of<T, int64_t, double>; }
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[[nodiscard]] bool is_boolean() const noexcept override { return std::is_same_v<T, bool>; }
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[[nodiscard]] bool is_date() const noexcept override { return std::is_same_v<T, date>; }
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[[nodiscard]] bool is_time() const noexcept override { return std::is_same_v<T, time>; }
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[[nodiscard]] bool is_date_time() const noexcept override { return std::is_same_v<T, date_time>; }
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/// \brief Returns a pointer to the value if the data type is a string.
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[[nodiscard]] value<string>* as_string() noexcept override { return as_value<string>(this); }
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/// \brief Returns a pointer to the value if the data type is an integer.
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[[nodiscard]] value<int64_t>* as_integer() noexcept override { return as_value<int64_t>(this); }
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/// \brief Returns a pointer to the value if the data type is a floating-point.
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[[nodiscard]] value<double>* as_floating_point() noexcept override { return as_value<double>(this); }
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/// \brief Returns a pointer to the value if the data type is boolean.
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[[nodiscard]] value<bool>* as_boolean() noexcept override { return as_value<bool>(this); }
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/// \brief Returns a pointer to the value if the data type is a date.
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[[nodiscard]] value<date>* as_date() noexcept override { return as_value<date>(this); }
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/// \brief Returns a pointer to the value if the data type is a time.
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[[nodiscard]] value<time>* as_time() noexcept override { return as_value<time>(this); }
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/// \brief Returns a pointer to the value if the data type is date-time.
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[[nodiscard]] value<date_time>* as_date_time() noexcept override { return as_value<date_time>(this); }
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/// \brief Returns a const pointer to the value if the data type is a string.
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[[nodiscard]] const value<string>* as_string() const noexcept override { return as_value<string>(this); }
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/// \brief Returns a const pointer to the value if the data type is an integer.
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[[nodiscard]] const value<int64_t>* as_integer() const noexcept override { return as_value<int64_t>(this); }
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/// \brief Returns a const pointer to the value if the data type is a floating-point.
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[[nodiscard]] const value<double>* as_floating_point() const noexcept override { return as_value<double>(this); }
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/// \brief Returns a const pointer to the value if the data type is a boolean.
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[[nodiscard]] const value<bool>* as_boolean() const noexcept override { return as_value<bool>(this); }
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/// \brief Returns a const pointer to the value if the data type is a date.
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[[nodiscard]] const value<date>* as_date() const noexcept override { return as_value<date>(this); }
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/// \brief Returns a const pointer to the value if the data type is a time.
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[[nodiscard]] const value<time>* as_time() const noexcept override { return as_value<time>(this); }
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/// \brief Returns a const pointer to the value if the data type is a date-time.
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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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/// \brief Returns a reference to the underlying value.
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[[nodiscard]] T& get() & noexcept { return val_; }
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/// \brief Returns a reference to the underlying value (rvalue overload).
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[[nodiscard]] T&& 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 T& get() const & noexcept { return val_; }
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/// \brief Returns a reference to the underlying value.
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[[nodiscard]] T& operator* () & noexcept { return val_; }
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/// \brief Returns a reference to the underlying value (rvalue overload).
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[[nodiscard]] T&& 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 T& operator* () const& noexcept { return val_; }
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/// \brief Returns a reference to the underlying value.
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[[nodiscard]] explicit operator T& () & noexcept { return val_; }
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/// \brief Returns a reference to the underlying value (rvalue overload).
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[[nodiscard]] explicit operator T&& () && 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 T& () const& noexcept { return val_; }
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template <typename Char, typename U>
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friend std::basic_ostream<Char>& operator << (std::basic_ostream<Char>& lhs, const value<U>& rhs);
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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<T, 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 U = T, typename = std::enable_if_t<std::is_same_v<U, string>>>
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value& operator= (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]] friend bool operator == (const value& lhs, value_arg rhs) noexcept { return lhs.val_ == rhs; }
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TOML_ASYMMETRICAL_EQUALITY_OPS(const value&, value_arg, )
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/// \brief Value less-than operator.
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[[nodiscard]] friend bool operator < (const value& lhs, value_arg rhs) noexcept { return lhs.val_ < rhs; }
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/// \brief Value less-than operator.
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[[nodiscard]] friend bool operator < (value_arg lhs, const value& rhs) noexcept { return lhs < rhs.val_; }
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/// \brief Value less-than-or-equal-to operator.
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[[nodiscard]] friend bool operator <= (const value& lhs, value_arg rhs) noexcept { return lhs.val_ <= rhs; }
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/// \brief Value less-than-or-equal-to operator.
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[[nodiscard]] friend bool operator <= (value_arg lhs, const value& rhs) noexcept { return lhs <= rhs.val_; }
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/// \brief Value greater-than operator.
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[[nodiscard]] friend bool operator > (const value& lhs, value_arg rhs) noexcept { return lhs.val_ > rhs; }
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/// \brief Value greater-than operator.
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[[nodiscard]] friend bool operator > (value_arg lhs, const value& rhs) noexcept { return lhs > rhs.val_; }
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/// \brief Value greater-than-or-equal-to operator.
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[[nodiscard]] friend bool operator >= (const value& lhs, value_arg rhs) noexcept { return lhs.val_ >= rhs; }
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/// \brief Value greater-than-or-equal-to operator.
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[[nodiscard]] friend bool operator >= (value_arg lhs, const value& rhs) noexcept { return lhs >= rhs.val_; }
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/// \brief Equality operator.
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///
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/// \param lhs The LHS value.
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/// \param rhs The RHS value.
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///
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/// \returns True if the values were of the same type and contained the same value.
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template <typename U>
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[[nodiscard]] friend bool operator == (const value& lhs, const value<U>& rhs) noexcept
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{
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if constexpr (std::is_same_v<T, U>)
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return lhs.val_ == rhs.val_;
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else
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return false;
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}
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/// \brief Inequality operator.
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///
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/// \param lhs The LHS value.
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/// \param rhs The RHS value.
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///
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/// \returns True if the values were not of the same type, or did not contain the same value.
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template <typename U>
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[[nodiscard]] friend bool operator != (const value& lhs, const value<U>& rhs) noexcept
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{
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return !(lhs == rhs);
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}
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/// \brief Less-than operator.
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///
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/// \param lhs The LHS toml::value.
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/// \param rhs The RHS toml::value.
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///
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/// \returns <strong><em>Same value types:</em></strong> `lhs.get() < rhs.get()` <br>
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/// <strong><em>Different value types:</em></strong> `lhs.type() < rhs.type()`
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template <typename U>
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[[nodiscard]] friend bool operator < (const value& lhs, const value<U>& rhs) noexcept
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{
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if constexpr (std::is_same_v<T, U>)
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return lhs.val_ < rhs.val_;
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else
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return impl::node_type_of<T> < impl::node_type_of<U>;
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}
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/// \brief Less-than-or-equal-to operator.
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///
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/// \param lhs The LHS toml::value.
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/// \param rhs The RHS toml::value.
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///
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/// \returns <strong><em>Same value types:</em></strong> `lhs.get() <= rhs.get()` <br>
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/// <strong><em>Different value types:</em></strong> `lhs.type() <= rhs.type()`
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template <typename U>
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[[nodiscard]] friend bool operator <= (const value& lhs, const value<U>& rhs) noexcept
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{
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if constexpr (std::is_same_v<T, U>)
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return lhs.val_ <= rhs.val_;
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else
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return impl::node_type_of<T> <= impl::node_type_of<U>;
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}
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/// \brief Greater-than operator.
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///
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/// \param lhs The LHS toml::value.
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/// \param rhs The RHS toml::value.
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///
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/// \returns <strong><em>Same value types:</em></strong> `lhs.get() > rhs.get()` <br>
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/// <strong><em>Different value types:</em></strong> `lhs.type() > rhs.type()`
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template <typename U>
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[[nodiscard]] friend bool operator > (const value& lhs, const value<U>& rhs) noexcept
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{
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if constexpr (std::is_same_v<T, U>)
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return lhs.val_ > rhs.val_;
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else
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return impl::node_type_of<T> > impl::node_type_of<U>;
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}
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/// \brief Greater-than-or-equal-to operator.
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///
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/// \param lhs The LHS toml::value.
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/// \param rhs The RHS toml::value.
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///
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/// \returns <strong><em>Same value types:</em></strong> `lhs.get() >= rhs.get()` <br>
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/// <strong><em>Different value types:</em></strong> `lhs.type() >= rhs.type()`
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template <typename U>
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[[nodiscard]] friend bool operator >= (const value& lhs, const value<U>& rhs) noexcept
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{
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if constexpr (std::is_same_v<T, U>)
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return lhs.val_ >= rhs.val_;
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else
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return impl::node_type_of<T> >= impl::node_type_of<U>;
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}
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};
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#if !TOML_ALL_INLINE
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TOML_PUSH_WARNINGS
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TOML_DISABLE_VTABLE_WARNINGS
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extern template class TOML_API value<string>;
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extern template class TOML_API value<int64_t>;
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extern template class TOML_API value<double>;
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extern template class TOML_API value<bool>;
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extern template class TOML_API value<date>;
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extern template class TOML_API value<time>;
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extern template class TOML_API value<date_time>;
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TOML_POP_WARNINGS
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#endif
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template <size_t N> value(const string_char(&)[N]) -> value<string>;
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template <size_t N> value(const string_char(&&)[N]) -> value<string>;
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value(const string_char*) -> value<string>;
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template <size_t N> value(string_char(&)[N]) -> value<string>;
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template <size_t N> value(string_char(&&)[N]) -> value<string>;
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value(string_char*) -> value<string>;
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value(string_view) -> value<string>;
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value(string) -> value<string>;
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value(bool) -> value<bool>;
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value(float) -> value<double>;
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value(double) -> value<double>;
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value(int8_t) -> value<int64_t>;
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value(int16_t) -> value<int64_t>;
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value(int32_t) -> value<int64_t>;
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value(int64_t) -> value<int64_t>;
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value(uint8_t) -> value<int64_t>;
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value(uint16_t) -> value<int64_t>;
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value(uint32_t) -> value<int64_t>;
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value(date) -> value<date>;
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value(time) -> value<time>;
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value(date_time) -> value<date_time>;
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#ifdef TOML_SMALL_FLOAT_TYPE
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value(TOML_SMALL_FLOAT_TYPE) -> value<double>;
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#endif
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#ifdef TOML_SMALL_INT_TYPE
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value(TOML_SMALL_INT_TYPE) -> value<int64_t>;
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#endif
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/// \brief Prints the value out to a stream.
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template <typename Char, typename T>
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TOML_EXTERNAL_LINKAGE
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std::basic_ostream<Char>& operator << (std::basic_ostream<Char>& lhs, const value<T>& rhs)
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{
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// this is the same behaviour as default_formatter, but it's so simple that there's
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// no need to spin up a new instance of it just for individual values.
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if constexpr (std::is_same_v<T, string>)
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{
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impl::print_to_stream('"', lhs);
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impl::print_to_stream_with_escapes(rhs.val_, lhs);
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impl::print_to_stream('"', lhs);
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}
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else
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impl::print_to_stream(rhs.val_, lhs);
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return lhs;
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}
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#if !TOML_ALL_INLINE
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extern template TOML_API std::ostream& operator << (std::ostream&, const value<toml::string>&);
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extern template TOML_API std::ostream& operator << (std::ostream&, const value<int64_t>&);
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extern template TOML_API std::ostream& operator << (std::ostream&, const value<double>&);
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extern template TOML_API std::ostream& operator << (std::ostream&, const value<bool>&);
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extern template TOML_API std::ostream& operator << (std::ostream&, const value<toml::date>&);
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extern template TOML_API std::ostream& operator << (std::ostream&, const value<toml::time>&);
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extern template TOML_API std::ostream& operator << (std::ostream&, const value<toml::date_time>&);
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#endif
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TOML_PUSH_WARNINGS
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TOML_DISABLE_INIT_WARNINGS
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template <typename T>
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inline optional<T> node::value() const noexcept
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{
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static_assert(
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impl::is_value<T> || std::is_same_v<T, string_view>,
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"Value type must be one of the TOML value types (or string_view)"
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);
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switch (type())
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{
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case node_type::none: [[fallthrough]];
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case node_type::table: [[fallthrough]];
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case node_type::array:
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return {};
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case node_type::string:
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{
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if constexpr (std::is_same_v<T, string> || std::is_same_v<T, string_view>)
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return { T{ ref_cast<string>().get() } };
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else
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return {};
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}
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case node_type::integer:
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{
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if constexpr (std::is_same_v<T, int64_t>)
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return ref_cast<int64_t>().get();
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else if constexpr (std::is_same_v<T, double>)
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return static_cast<double>(ref_cast<int64_t>().get());
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else
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return {};
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}
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case node_type::floating_point:
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{
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if constexpr (std::is_same_v<T, double>)
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return ref_cast<double>().get();
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else if constexpr (std::is_same_v<T, int64_t>)
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return static_cast<int64_t>(ref_cast<double>().get());
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else
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return {};
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}
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case node_type::boolean:
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{
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if constexpr (std::is_same_v<T, bool>)
|
|
return ref_cast<bool>().get();
|
|
else
|
|
return {};
|
|
}
|
|
|
|
case node_type::date:
|
|
{
|
|
if constexpr (std::is_same_v<T, date>)
|
|
return ref_cast<date>().get();
|
|
else
|
|
return {};
|
|
}
|
|
|
|
case node_type::time:
|
|
{
|
|
if constexpr (std::is_same_v<T, time>)
|
|
return ref_cast<time>().get();
|
|
else
|
|
return {};
|
|
}
|
|
|
|
case node_type::date_time:
|
|
{
|
|
if constexpr (std::is_same_v<T, date_time>)
|
|
return ref_cast<date_time>().get();
|
|
else
|
|
return {};
|
|
}
|
|
|
|
TOML_NO_DEFAULT_CASE;
|
|
}
|
|
|
|
TOML_UNREACHABLE;
|
|
}
|
|
|
|
TOML_POP_WARNINGS
|
|
|
|
template <typename T>
|
|
inline auto node::value_or(T&& default_value) const noexcept
|
|
{
|
|
static_assert(
|
|
impl::is_value_or_promotable<impl::remove_cvref_t<T>>,
|
|
"Default value type must be (or be promotable to) one of the TOML value types"
|
|
);
|
|
|
|
using value_type = impl::promoted<impl::remove_cvref_t<T>>;
|
|
using return_type = std::conditional_t<
|
|
std::is_same_v<value_type, string>,
|
|
std::conditional_t<std::is_same_v<impl::remove_cvref_t<T>, string>, string, string_view>,
|
|
value_type
|
|
>;
|
|
|
|
if (auto val = this->value<return_type>())
|
|
return *val;
|
|
return return_type{ std::forward<T>(default_value) };
|
|
}
|
|
}
|
|
|
|
TOML_POP_WARNINGS // TOML_DISABLE_FLOAT_WARNINGS, TOML_DISABLE_PADDING_WARNINGS
|