528 lines
20 KiB
C++
528 lines
20 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_common.h"
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TOML_PUSH_WARNINGS
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TOML_DISABLE_VTABLE_WARNINGS
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namespace toml
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{
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/// \brief A TOML node.
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///
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/// \detail A parsed TOML document forms a tree made up of tables, arrays and values.
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/// This type is the base of each of those, providing a lot of the polymorphic plumbing.
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class TOML_INTERFACE TOML_API node
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{
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private:
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friend class TOML_PARSER_TYPENAME;
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source_region source_{};
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protected:
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node(node&& other) noexcept;
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node& operator= (node&& rhs) noexcept;
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template <typename T>
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[[nodiscard]] TOML_ALWAYS_INLINE
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impl::node_of<T>& ref_cast() & noexcept
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{
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return *reinterpret_cast<impl::node_of<T>*>(this);
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}
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template <typename T>
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[[nodiscard]] TOML_ALWAYS_INLINE
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impl::node_of<T>&& ref_cast() && noexcept
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{
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return std::move(*reinterpret_cast<impl::node_of<T>*>(this));
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}
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template <typename T>
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[[nodiscard]] TOML_ALWAYS_INLINE
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const impl::node_of<T>& ref_cast() const & noexcept
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{
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return *reinterpret_cast<const impl::node_of<T>*>(this);
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}
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template <typename N, typename T>
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using ref_cast_type = decltype(std::declval<N>().template ref_cast<T>());
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node() noexcept = default;
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node(const node&) = delete;
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node& operator= (const node&) = delete;
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public:
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virtual ~node() noexcept = default;
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/// \brief Returns the node's type identifier.
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[[nodiscard]] virtual node_type type() const noexcept = 0;
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/// \brief Returns true if this node is a table.
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[[nodiscard]] virtual bool is_table() const noexcept = 0;
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/// \brief Returns true if this node is an array.
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[[nodiscard]] virtual bool is_array() const noexcept = 0;
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/// \brief Returns true if this node is a value.
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[[nodiscard]] virtual bool is_value() const noexcept = 0;
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/// \brief Returns true if this node is a string value.
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[[nodiscard]] virtual bool is_string() const noexcept;
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/// \brief Returns true if this node is an integer value.
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[[nodiscard]] virtual bool is_integer() const noexcept;
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/// \brief Returns true if this node is an floating-point value.
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[[nodiscard]] virtual bool is_floating_point() const noexcept;
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/// \brief Returns true if this node is an integer or floating-point value.
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[[nodiscard]] virtual bool is_number() const noexcept;
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/// \brief Returns true if this node is a boolean value.
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[[nodiscard]] virtual bool is_boolean() const noexcept;
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/// \brief Returns true if this node is a local date value.
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[[nodiscard]] virtual bool is_date() const noexcept;
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/// \brief Returns true if this node is a local time value.
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[[nodiscard]] virtual bool is_time() const noexcept;
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/// \brief Returns true if this node is a date-time value.
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[[nodiscard]] virtual bool is_date_time() const noexcept;
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/// \brief Returns true if this node is an array containing only tables.
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[[nodiscard]] virtual bool is_array_of_tables() const noexcept;
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/// \brief Checks if a node is a specific type.
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///
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/// \tparam T A TOML node or value type.
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///
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/// \returns Returns true if this node is an instance of the specified type.
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template <typename T>
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[[nodiscard]] TOML_ALWAYS_INLINE
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bool is() const noexcept
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{
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using type = impl::unwrapped<impl::remove_cvref_t<T>>;
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static_assert(
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impl::is_value_or_node<type>,
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"Template type parameter must be one of the TOML value types, a toml::table, or a toml::array"
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);
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if constexpr (std::is_same_v<type, table>) return is_table();
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else if constexpr (std::is_same_v<type, array>) return is_array();
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else if constexpr (std::is_same_v<type, string>) return is_string();
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else if constexpr (std::is_same_v<type, int64_t>) return is_integer();
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else if constexpr (std::is_same_v<type, double>) return is_floating_point();
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else if constexpr (std::is_same_v<type, bool>) return is_boolean();
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else if constexpr (std::is_same_v<type, date>) return is_date();
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else if constexpr (std::is_same_v<type, time>) return is_time();
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else if constexpr (std::is_same_v<type, date_time>) return is_date_time();
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}
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/// \brief Returns a pointer to the node as a toml::table, if it is one.
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[[nodiscard]] virtual table* as_table() noexcept;
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/// \brief Returns a pointer to the node as a toml::array, if it is one.
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[[nodiscard]] virtual array* as_array() noexcept;
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/// \brief Returns a pointer to the node as a toml::value<string>, if it is one.
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[[nodiscard]] virtual toml::value<string>* as_string() noexcept;
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/// \brief Returns a pointer to the node as a toml::value<int64_t>, if it is one.
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[[nodiscard]] virtual toml::value<int64_t>* as_integer() noexcept;
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/// \brief Returns a pointer to the node as a toml::value<double>, if it is one.
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[[nodiscard]] virtual toml::value<double>* as_floating_point() noexcept;
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/// \brief Returns a pointer to the node as a toml::value<bool>, if it is one.
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[[nodiscard]] virtual toml::value<bool>* as_boolean() noexcept;
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/// \brief Returns a pointer to the node as a toml::value<date>, if it is one.
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[[nodiscard]] virtual toml::value<date>* as_date() noexcept;
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/// \brief Returns a pointer to the node as a toml::value<time>, if it is one.
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[[nodiscard]] virtual toml::value<time>* as_time() noexcept;
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/// \brief Returns a pointer to the node as a toml::value<date_time>, if it is one.
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[[nodiscard]] virtual toml::value<date_time>* as_date_time() noexcept;
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[[nodiscard]] virtual const table* as_table() const noexcept;
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[[nodiscard]] virtual const array* as_array() const noexcept;
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[[nodiscard]] virtual const toml::value<string>* as_string() const noexcept;
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[[nodiscard]] virtual const toml::value<int64_t>* as_integer() const noexcept;
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[[nodiscard]] virtual const toml::value<double>* as_floating_point() const noexcept;
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[[nodiscard]] virtual const toml::value<bool>* as_boolean() const noexcept;
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[[nodiscard]] virtual const toml::value<date>* as_date() const noexcept;
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[[nodiscard]] virtual const toml::value<time>* as_time() const noexcept;
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[[nodiscard]] virtual const toml::value<date_time>* as_date_time() const noexcept;
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/// \brief Gets the raw value contained by this node.
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///
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/// \detail The optional returned by this function will only contain a value if the node was an instance of
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/// toml::value with the same value type as the template argument. Additionally, some type are allowed to
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/// convert to each other, for instance asking for an integer when the value exists as a double,
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/// or requesting a string value as a string_view: \cpp
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/// auto tbl = toml::parse(R"(
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/// int_val = 10
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/// float_val = 25.6
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/// string_val = "kek"
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/// )"sv);
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///
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/// if (auto val = tbl.get("int_val"sv)->value<int64_t>())
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/// std::cout << "'int_val' as int64_t: "sv << *val << std::endl;
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/// if (auto val = tbl.get("int_val"sv)->value<double>())
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/// std::cout << "'int_val' as double: "sv << *val << std::endl;
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/// if (auto val = tbl.get("float_val"sv)->value<int64_t>())
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/// std::cout << "'float_val' as int64_t: "sv << *val << std::endl;
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/// if (auto val = tbl.get("float_val"sv)->value<double>())
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/// std::cout << "'float_val' as double: "sv << *val << std::endl;
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/// if (auto val = tbl.get("string_val"sv)->value<std::string>())
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/// std::cout << "'string_val' as std::string: "sv << *val << std::endl;
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/// if (auto val = tbl.get("string_val"sv)->value<std::string_view>())
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/// std::cout << "'string_val' as std::string_view: "sv << *val << std::endl;
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/// if (auto val = tbl.get("string_val"sv)->value<int64_t>())
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/// std::cout << "this line won't be printed."sv << std::endl;
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/// \ecpp
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///
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/// \out
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/// 'int_val' as int64_t: 10
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/// 'int_val' as double: 10
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/// 'float_val' as int64_t: 25
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/// 'float_val' as double: 25.6
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/// 'string_val' as std::string: kek
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/// 'string_val' as std::string_view: kek
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/// \eout
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///
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/// \tparam T One of the TOML value types. Can also be a string_view.
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///
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/// \returns The underlying value if the node was a value of the matching type (or convertible to it), or an empty optional.
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template <typename T>
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[[nodiscard]] optional<T> value() const noexcept;
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/// \brief Gets the raw value contained by this node, or a default.
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///
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/// \tparam T Default value type. Must be (or be promotable to) one of the TOML value types.
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/// \param default_value The default value to return if the node wasn't a value, wasn't the
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/// correct type, or no conversion was possible.
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///
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/// \returns The node's underlying value, or the default if the node wasn't a value, wasn't the
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/// correct type, or no conversion was possible.
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///
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/// \see node::value()
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template <typename T>
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[[nodiscard]] auto value_or(T&& default_value) const noexcept;
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/// \brief Gets a pointer to the node as a more specific node type.
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///
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/// \details \cpp
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///
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/// auto int_value = node->as<int64_t>();
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/// auto tbl = node->as<toml::table>();
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/// if (int_value)
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/// std::cout << "Node is a value<int64_t>" << std::endl;
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/// else if (tbl)
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/// std::cout << "Node is a table" << std::endl;
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///
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/// // fully-qualified value node types also work:
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/// auto int_value2 = node->as<toml::value<int64_t>>();
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/// if (int_value2)
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/// std::cout << "Node is a value<int64_t>" << std::endl;
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///
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/// \ecpp
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///
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/// \tparam T The node type or TOML value type to cast to.
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///
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/// \returns A pointer to the node as the given type, or nullptr if it was a different type.
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template <typename T>
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[[nodiscard]] TOML_ALWAYS_INLINE
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impl::node_of<T>* as() noexcept
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{
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using type = impl::unwrapped<T>;
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static_assert(
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impl::is_value_or_node<type>,
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"Template type parameter must be one of the TOML value types, a toml::table, or a toml::array"
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);
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if constexpr (std::is_same_v<type, table>) return as_table();
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else if constexpr (std::is_same_v<type, array>) return as_array();
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else if constexpr (std::is_same_v<type, string>) return as_string();
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else if constexpr (std::is_same_v<type, int64_t>) return as_integer();
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else if constexpr (std::is_same_v<type, double>) return as_floating_point();
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else if constexpr (std::is_same_v<type, bool>) return as_boolean();
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else if constexpr (std::is_same_v<type, date>) return as_date();
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else if constexpr (std::is_same_v<type, time>) return as_time();
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else if constexpr (std::is_same_v<type, date_time>) return as_date_time();
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}
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/// \brief Gets a pointer to the node as a more specific node type (const overload).
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template <typename T>
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[[nodiscard]] TOML_ALWAYS_INLINE
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const impl::node_of<T>* as() const noexcept
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{
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using type = impl::unwrapped<T>;
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static_assert(
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impl::is_value_or_node<type>,
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"Template type parameter must be one of the TOML value types, a toml::table, or a toml::array"
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);
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if constexpr (std::is_same_v<type, table>) return as_table();
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else if constexpr (std::is_same_v<type, array>) return as_array();
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else if constexpr (std::is_same_v<type, string>) return as_string();
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else if constexpr (std::is_same_v<type, int64_t>) return as_integer();
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else if constexpr (std::is_same_v<type, double>) return as_floating_point();
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else if constexpr (std::is_same_v<type, bool>) return as_boolean();
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else if constexpr (std::is_same_v<type, date>) return as_date();
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else if constexpr (std::is_same_v<type, time>) return as_time();
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else if constexpr (std::is_same_v<type, date_time>) return as_date_time();
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}
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/// \brief Returns the source region responsible for generating this node during parsing.
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[[nodiscard]] const source_region& source() const noexcept;
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private:
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template <typename Func, typename N, typename T>
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static constexpr bool can_visit = std::is_invocable_v<Func, ref_cast_type<N, T>>;
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template <typename Func, typename N>
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static constexpr bool can_visit_any =
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can_visit<Func, N, table>
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|| can_visit<Func, N, array>
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|| can_visit<Func, N, string>
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|| can_visit<Func, N, int64_t>
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|| can_visit<Func, N, double>
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|| can_visit<Func, N, bool>
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|| can_visit<Func, N, date>
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|| can_visit<Func, N, time>
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|| can_visit<Func, N, date_time>;
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template <typename Func, typename N>
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static constexpr bool can_visit_all =
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can_visit<Func, N, table>
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&& can_visit<Func, N, array>
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&& can_visit<Func, N, string>
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&& can_visit<Func, N, int64_t>
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&& can_visit<Func, N, double>
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&& can_visit<Func, N, bool>
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&& can_visit<Func, N, date>
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&& can_visit<Func, N, time>
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&& can_visit<Func, N, date_time>;
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template <typename Func, typename N, typename T>
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static constexpr bool visit_is_nothrow_one =
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!can_visit<Func, N, T>
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|| std::is_nothrow_invocable_v<Func, ref_cast_type<N, T>>;
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template <typename Func, typename N>
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static constexpr bool visit_is_nothrow =
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visit_is_nothrow_one<Func, N, table>
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&& visit_is_nothrow_one<Func, N, array>
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&& visit_is_nothrow_one<Func, N, string>
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&& visit_is_nothrow_one<Func, N, int64_t>
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&& visit_is_nothrow_one<Func, N, double>
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&& visit_is_nothrow_one<Func, N, bool>
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&& visit_is_nothrow_one<Func, N, date>
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&& visit_is_nothrow_one<Func, N, time>
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&& visit_is_nothrow_one<Func, N, date_time>;
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template <typename Func, typename N, typename T, bool = can_visit<Func, N, T>>
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struct visit_return_type final
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{
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using type = decltype(std::declval<Func>()(std::declval<ref_cast_type<N, T>>()));
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};
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template <typename Func, typename N, typename T>
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struct visit_return_type<Func, N, T, false> final
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{
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using type = void;
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};
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template <typename A, typename B>
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using nonvoid = std::conditional_t<std::is_void_v<A>, B, A>;
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//# these functions are static helpers to preserve const and ref categories
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//# (otherwise I'd have to implement them thrice)
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//# ((propagation in C++: a modern horror story))
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template <typename N, typename Func>
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static decltype(auto) do_visit(N&& n, Func&& visitor)
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noexcept(visit_is_nothrow<Func&&, N&&>)
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{
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static_assert(
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can_visit_any<Func&&, N&&>,
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"Visitors must be invocable for at least one of the toml::node specializations"
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);
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switch (n.type())
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{
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case node_type::table:
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if constexpr (can_visit<Func&&, N&&, table>)
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return std::forward<Func>(visitor)(std::forward<N>(n).template ref_cast<table>());
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break;
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case node_type::array:
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if constexpr (can_visit<Func&&, N&&, array>)
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return std::forward<Func>(visitor)(std::forward<N>(n).template ref_cast<array>());
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break;
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case node_type::string:
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if constexpr (can_visit<Func&&, N&&, string>)
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return std::forward<Func>(visitor)(std::forward<N>(n).template ref_cast<string>());
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break;
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case node_type::integer:
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if constexpr (can_visit<Func&&, N&&, int64_t>)
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return std::forward<Func>(visitor)(std::forward<N>(n).template ref_cast<int64_t>());
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break;
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case node_type::floating_point:
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if constexpr (can_visit<Func&&, N&&, double>)
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return std::forward<Func>(visitor)(std::forward<N>(n).template ref_cast<double>());
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break;
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case node_type::boolean:
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if constexpr (can_visit<Func&&, N&&, bool>)
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return std::forward<Func>(visitor)(std::forward<N>(n).template ref_cast<bool>());
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break;
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case node_type::date:
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if constexpr (can_visit<Func&&, N&&, date>)
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return std::forward<Func>(visitor)(std::forward<N>(n).template ref_cast<date>());
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break;
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case node_type::time:
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if constexpr (can_visit<Func&&, N&&, time>)
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return std::forward<Func>(visitor)(std::forward<N>(n).template ref_cast<time>());
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break;
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case node_type::date_time:
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if constexpr (can_visit<Func&&, N&&, date_time>)
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return std::forward<Func>(visitor)(std::forward<N>(n).template ref_cast<date_time>());
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break;
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case node_type::none: TOML_UNREACHABLE;
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TOML_NO_DEFAULT_CASE;
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}
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if constexpr (can_visit_all<Func&&, N&&>)
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TOML_UNREACHABLE;
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else
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{
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using return_type =
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nonvoid<typename visit_return_type<Func&&, N&&, table>::type,
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nonvoid<typename visit_return_type<Func&&, N&&, array>::type,
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nonvoid<typename visit_return_type<Func&&, N&&, string>::type,
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nonvoid<typename visit_return_type<Func&&, N&&, int64_t>::type,
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nonvoid<typename visit_return_type<Func&&, N&&, double>::type,
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nonvoid<typename visit_return_type<Func&&, N&&, bool>::type,
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nonvoid<typename visit_return_type<Func&&, N&&, date>::type,
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nonvoid<typename visit_return_type<Func&&, N&&, time>::type,
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typename visit_return_type<Func&&, N&&, date_time>::type
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>>>>>>>>;
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if constexpr (!std::is_void_v<return_type>)
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{
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static_assert(
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std::is_default_constructible_v<return_type>,
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"Non-exhaustive visitors must return a default-constructible type, or void"
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);
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return return_type{};
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}
|
|
}
|
|
}
|
|
|
|
|
|
template <typename T, typename N>
|
|
[[nodiscard]] static decltype(auto) do_ref(N&& n) noexcept
|
|
{
|
|
using type = impl::unwrapped<T>;
|
|
static_assert(
|
|
impl::is_value_or_node<type>,
|
|
"Template type parameter must be one of the TOML value types, a toml::table, or a toml::array"
|
|
);
|
|
TOML_ASSERT(
|
|
n.template is<T>()
|
|
&& "template type argument T provided to toml::node::ref() didn't match the node's actual type"
|
|
);
|
|
if constexpr (impl::is_value<type>)
|
|
return std::forward<N>(n).template ref_cast<type>().get();
|
|
else
|
|
return std::forward<N>(n).template ref_cast<type>();
|
|
}
|
|
|
|
public:
|
|
|
|
/// \brief Invokes a visitor on the node based on the node's concrete type.
|
|
///
|
|
/// \details Visitation is useful when you expect
|
|
/// a node to be one of a set number of types and need
|
|
/// to handle these types differently. Using `visit()` allows
|
|
/// you to eliminate some of the casting/conversion boilerplate: \cpp
|
|
///
|
|
/// node.visit([](auto&& n)
|
|
/// {
|
|
/// if constexpr (toml::is_string<decltype(n)>)
|
|
/// do_something_with_a_string(*n)); //n is a toml::value<toml::string>
|
|
/// else if constexpr (toml::is_integer<decltype(n)>)
|
|
/// do_something_with_an_int(*n); //n is a toml::value<int64_t>
|
|
/// else
|
|
/// throw std::exception{ "Expected string or integer" };
|
|
/// });
|
|
///
|
|
/// \ecpp
|
|
///
|
|
/// \tparam Func A callable type invocable with one or more of the
|
|
/// toml++ node types.
|
|
///
|
|
/// \param visitor The visitor object.
|
|
///
|
|
/// \returns The return value of the visitor.
|
|
/// Can be void. Non-exhaustive visitors must return a default-constructible type.
|
|
///
|
|
/// \see https://en.wikipedia.org/wiki/Visitor_pattern
|
|
template <typename Func>
|
|
decltype(auto) visit(Func&& visitor) & noexcept(visit_is_nothrow<Func&&, node&>)
|
|
{
|
|
return do_visit(*this, std::forward<Func>(visitor));
|
|
}
|
|
|
|
template <typename Func>
|
|
decltype(auto) visit(Func&& visitor) && noexcept(visit_is_nothrow<Func&&, node&&>)
|
|
{
|
|
return do_visit(std::move(*this), std::forward<Func>(visitor));
|
|
}
|
|
|
|
template <typename Func>
|
|
decltype(auto) visit(Func&& visitor) const& noexcept(visit_is_nothrow<Func&&, const node&>)
|
|
{
|
|
return do_visit(*this, std::forward<Func>(visitor));
|
|
}
|
|
|
|
/// \brief Gets a raw reference to a value node's underlying data.
|
|
///
|
|
/// \warning This function is dangerous if used carelessly and **WILL** break your code if the
|
|
/// chosen value type doesn't match the node's actual type. In debug builds an assertion
|
|
/// will fire when invalid accesses are attempted: \cpp
|
|
///
|
|
/// auto tbl = toml::parse(R"(
|
|
///
|
|
/// min = 32
|
|
/// max = 45
|
|
///
|
|
/// )"sv);
|
|
///
|
|
/// auto& min_ref = tbl.get("min")->ref<int64_t>(); // this is OK
|
|
/// auto& max_ref = tbl.get("max")->ref<double>(); // hits assertion because the type is wrong
|
|
///
|
|
/// \ecpp
|
|
///
|
|
/// \tparam T One of the TOML value types.
|
|
///
|
|
/// \returns A reference to the underlying data.
|
|
template <typename T>
|
|
[[nodiscard]] impl::unwrapped<T>& ref() & noexcept
|
|
{
|
|
return do_ref<T>(*this);
|
|
}
|
|
|
|
template <typename T>
|
|
[[nodiscard]] impl::unwrapped<T>&& ref() && noexcept
|
|
{
|
|
return do_ref<T>(std::move(*this));
|
|
}
|
|
|
|
template <typename T>
|
|
[[nodiscard]] const impl::unwrapped<T>& ref() const& noexcept
|
|
{
|
|
return do_ref<T>(*this);
|
|
}
|
|
};
|
|
}
|
|
|
|
TOML_POP_WARNINGS //TOML_DISABLE_VTABLE_WARNINGS
|