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151 lines
7.1 KiB
C++
151 lines
7.1 KiB
C++
// Copyright Toru Niina 2017.
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// Distributed under the MIT License.
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#ifndef TOML11_TYPES_HPP
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#define TOML11_TYPES_HPP
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#include <unordered_map>
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#include <vector>
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#include "comments.hpp"
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#include "datetime.hpp"
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#include "string.hpp"
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#include "traits.hpp"
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namespace toml
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{
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template<typename Comment, // discard/preserve_comment
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template<typename ...> class Table, // map-like class
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template<typename ...> class Array> // vector-like class
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class basic_value;
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using character = char;
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using key = std::string;
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using boolean = bool;
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using integer = std::int64_t;
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using floating = double; // "float" is a keyward, cannot use it here.
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// the following stuffs are structs defined here, so aliases are not needed.
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// - string
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// - offset_datetime
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// - offset_datetime
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// - local_datetime
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// - local_date
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// - local_time
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// default toml::value and default array/table. these are defined after defining
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// basic_value itself.
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// using value = basic_value<discard_comments, std::unordered_map, std::vector>;
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// using array = typename value::array_type;
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// using table = typename value::table_type;
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enum class value_t : std::uint8_t
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{
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empty = 0,
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boolean = 1,
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integer = 2,
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floating = 3,
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string = 4,
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offset_datetime = 5,
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local_datetime = 6,
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local_date = 7,
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local_time = 8,
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array = 9,
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table = 10,
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};
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template<typename charT, typename traits>
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inline std::basic_ostream<charT, traits>&
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operator<<(std::basic_ostream<charT, traits>& os, value_t t)
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{
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switch(t)
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{
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case value_t::boolean : os << "boolean"; return os;
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case value_t::integer : os << "integer"; return os;
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case value_t::floating : os << "floating"; return os;
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case value_t::string : os << "string"; return os;
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case value_t::offset_datetime : os << "offset_datetime"; return os;
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case value_t::local_datetime : os << "local_datetime"; return os;
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case value_t::local_date : os << "local_date"; return os;
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case value_t::local_time : os << "local_time"; return os;
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case value_t::array : os << "array"; return os;
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case value_t::table : os << "table"; return os;
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case value_t::empty : os << "empty"; return os;
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default : os << "unknown"; return os;
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}
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}
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template<typename charT = char,
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typename traits = std::char_traits<charT>,
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typename alloc = std::allocator<charT>>
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inline std::basic_string<charT, traits, alloc> stringize(value_t t)
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{
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std::basic_ostringstream<charT, traits, alloc> oss;
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oss << t;
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return oss.str();
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}
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namespace detail
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{
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// helper to define a type that represents a value_t value.
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template<value_t V>
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using value_t_constant = std::integral_constant<value_t, V>;
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// meta-function that convertes from value_t to the exact toml type that corresponds to.
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// It takes toml::basic_value type because array and table types depend on it.
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template<value_t t, typename Value> struct enum_to_type {using type = void ;};
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template<typename Value> struct enum_to_type<value_t::empty , Value>{using type = void ;};
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template<typename Value> struct enum_to_type<value_t::boolean , Value>{using type = boolean ;};
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template<typename Value> struct enum_to_type<value_t::integer , Value>{using type = integer ;};
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template<typename Value> struct enum_to_type<value_t::floating , Value>{using type = floating ;};
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template<typename Value> struct enum_to_type<value_t::string , Value>{using type = string ;};
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template<typename Value> struct enum_to_type<value_t::offset_datetime, Value>{using type = offset_datetime ;};
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template<typename Value> struct enum_to_type<value_t::local_datetime , Value>{using type = local_datetime ;};
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template<typename Value> struct enum_to_type<value_t::local_date , Value>{using type = local_date ;};
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template<typename Value> struct enum_to_type<value_t::local_time , Value>{using type = local_time ;};
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template<typename Value> struct enum_to_type<value_t::array , Value>{using type = typename Value::array_type;};
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template<typename Value> struct enum_to_type<value_t::table , Value>{using type = typename Value::table_type;};
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// meta-function that converts from an exact toml type to the enum that corresponds to.
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template<typename T, typename Value>
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struct type_to_enum : std::conditional<
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std::is_same<T, typename Value::array_type>::value, // if T == array_type,
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value_t_constant<value_t::array>, // then value_t::array
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typename std::conditional< // else...
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std::is_same<T, typename Value::table_type>::value, // if T == table_type
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value_t_constant<value_t::table>, // then value_t::table
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value_t_constant<value_t::empty> // else value_t::empty
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>::type
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>::type {};
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template<typename Value> struct type_to_enum<boolean , Value>: value_t_constant<value_t::boolean > {};
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template<typename Value> struct type_to_enum<integer , Value>: value_t_constant<value_t::integer > {};
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template<typename Value> struct type_to_enum<floating , Value>: value_t_constant<value_t::floating > {};
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template<typename Value> struct type_to_enum<string , Value>: value_t_constant<value_t::string > {};
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template<typename Value> struct type_to_enum<offset_datetime, Value>: value_t_constant<value_t::offset_datetime> {};
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template<typename Value> struct type_to_enum<local_datetime , Value>: value_t_constant<value_t::local_datetime > {};
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template<typename Value> struct type_to_enum<local_date , Value>: value_t_constant<value_t::local_date > {};
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template<typename Value> struct type_to_enum<local_time , Value>: value_t_constant<value_t::local_time > {};
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// meta-function that checks the type T is the same as one of the toml::* types.
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template<typename T, typename Value>
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struct is_exact_toml_type : disjunction<
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std::is_same<T, boolean >,
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std::is_same<T, integer >,
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std::is_same<T, floating >,
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std::is_same<T, string >,
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std::is_same<T, offset_datetime>,
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std::is_same<T, local_datetime >,
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std::is_same<T, local_date >,
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std::is_same<T, local_time >,
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std::is_same<T, typename Value::array_type>,
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std::is_same<T, typename Value::table_type>
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>{};
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template<typename T, typename V> struct is_exact_toml_type<T&, V> : is_exact_toml_type<T, V>{};
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template<typename T, typename V> struct is_exact_toml_type<T const&, V> : is_exact_toml_type<T, V>{};
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template<typename T, typename V> struct is_exact_toml_type<T volatile&, V> : is_exact_toml_type<T, V>{};
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template<typename T, typename V> struct is_exact_toml_type<T const volatile&, V>: is_exact_toml_type<T, V>{};
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} // detail
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} // toml
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#endif// TOML11_TYPES_H
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