mirror of
https://github.com/ToruNiina/toml11.git
synced 2024-11-09 22:30:07 +00:00
835 lines
28 KiB
C++
835 lines
28 KiB
C++
// Copyright Toru Niina 2017.
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// Distributed under the MIT License.
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#ifndef TOML11_GET_HPP
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#define TOML11_GET_HPP
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#include "from.hpp"
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#include "result.hpp"
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#include "value.hpp"
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#include <algorithm>
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namespace toml
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{
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// ============================================================================
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// exact toml::* type
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template<typename T, typename std::enable_if<
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detail::is_exact_toml_type<T>::value, std::nullptr_t>::type = nullptr>
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inline T& get(value& v)
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{
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return v.cast<detail::toml_value_t<T>::value>();
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}
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template<typename T, typename std::enable_if<
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detail::is_exact_toml_type<T>::value, std::nullptr_t>::type = nullptr>
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inline T const& get(const value& v)
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{
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return v.cast<detail::toml_value_t<T>::value>();
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}
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template<typename T, typename std::enable_if<
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detail::is_exact_toml_type<T>::value, std::nullptr_t>::type = nullptr>
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inline T&& get(value&& v)
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{
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return std::move(v.cast<detail::toml_value_t<T>::value>());
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}
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// ============================================================================
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// T == toml::value; identity transformation.
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template<typename T, typename std::enable_if<
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std::is_same<T, ::toml::value>::value, std::nullptr_t>::type = nullptr>
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inline T& get(value& v)
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{
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return v;
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}
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template<typename T, typename std::enable_if<
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std::is_same<T, ::toml::value>::value, std::nullptr_t>::type = nullptr>
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inline T const& get(const value& v)
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{
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return v;
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}
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template<typename T, typename std::enable_if<
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std::is_same<T, ::toml::value>::value, std::nullptr_t>::type = nullptr>
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inline T&& get(value&& v)
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{
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return std::move(v);
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}
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// ============================================================================
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// integer convertible from toml::Integer
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template<typename T, typename std::enable_if<detail::conjunction<
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std::is_integral<T>, // T is integral
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detail::negation<std::is_same<T, bool>>, // but not bool
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detail::negation<detail::is_exact_toml_type<T>> // but not toml::integer
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>::value, std::nullptr_t>::type = nullptr>
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inline T get(const value& v)
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{
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return static_cast<T>(v.cast<value_t::Integer>());
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}
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// ============================================================================
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// floating point convertible from toml::Float
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template<typename T, typename std::enable_if<detail::conjunction<
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std::is_floating_point<T>, // T is floating_point
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detail::negation<detail::is_exact_toml_type<T>> // but not toml::Float
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>::value, std::nullptr_t>::type = nullptr>
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inline T get(const value& v)
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{
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return static_cast<T>(v.cast<value_t::Float>());
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}
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// ============================================================================
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// std::string; toml uses its own toml::string, but it should be convertible to
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// std::string seamlessly
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template<typename T, typename std::enable_if<
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std::is_same<T, std::string>::value, std::nullptr_t>::type = nullptr>
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inline std::string& get(value& v)
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{
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return v.cast<value_t::String>().str;
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}
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template<typename T, typename std::enable_if<
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std::is_same<T, std::string>::value, std::nullptr_t>::type = nullptr>
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inline std::string const& get(const value& v)
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{
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return v.cast<value_t::String>().str;
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}
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template<typename T, typename std::enable_if<
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std::is_same<T, std::string>::value, std::nullptr_t>::type = nullptr>
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inline std::string get(value&& v)
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{
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return std::move(v.cast<value_t::String>().str);
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}
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// ============================================================================
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// std::string_view
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#if __cplusplus >= 201703L
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template<typename T, typename std::enable_if<
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std::is_same<T, std::string_view>::value, std::nullptr_t>::type = nullptr>
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inline std::string_view get(const value& v)
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{
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return std::string_view(v.cast<value_t::String>().str);
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}
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#endif
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// ============================================================================
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// std::chrono::duration from toml::local_time.
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template<typename T, typename std::enable_if<
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detail::is_chrono_duration<T>::value, std::nullptr_t>::type = nullptr>
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inline T get(const value& v)
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{
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return std::chrono::duration_cast<T>(
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std::chrono::nanoseconds(v.cast<value_t::LocalTime>()));
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}
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// ============================================================================
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// std::chrono::system_clock::time_point from toml::datetime variants
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template<typename T, typename std::enable_if<
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std::is_same<std::chrono::system_clock::time_point, T>::value,
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std::nullptr_t>::type = nullptr>
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inline T get(const value& v)
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{
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switch(v.type())
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{
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case value_t::LocalDate:
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{
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return std::chrono::system_clock::time_point(
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v.cast<value_t::LocalDate>());
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}
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case value_t::LocalDatetime:
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{
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return std::chrono::system_clock::time_point(
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v.cast<value_t::LocalDatetime>());
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}
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default:
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{
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return std::chrono::system_clock::time_point(
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v.cast<value_t::OffsetDatetime>());
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}
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}
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}
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// ============================================================================
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// forward declaration to use this recursively. ignore this and go ahead.
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template<typename T, typename std::enable_if<detail::conjunction<
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detail::is_container<T>, // T is container
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detail::has_resize_method<T>, // T::resize(N) works
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detail::negation<detail::is_exact_toml_type<T>> // but not toml::array
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>::value, std::nullptr_t>::type = nullptr>
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T get(const value& v);
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template<typename T, typename std::enable_if<detail::conjunction<
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detail::is_container<T>, // T is container
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detail::negation<detail::has_resize_method<T>>, // no T::resize() exists
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detail::negation<detail::is_exact_toml_type<T>> // not toml::array
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>::value, std::nullptr_t>::type = nullptr>
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T get(const value& v);
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template<typename T, typename std::enable_if<
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detail::is_std_pair<T>::value, std::nullptr_t>::type = nullptr>
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T get(const value& v);
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template<typename T, typename std::enable_if<
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detail::is_std_tuple<T>::value, std::nullptr_t>::type = nullptr>
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T get(const value& v);
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template<typename T, typename std::enable_if<detail::conjunction<
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detail::is_map<T>, // T is map
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detail::negation<detail::is_exact_toml_type<T>> // but not toml::table
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>::value, std::nullptr_t>::type = nullptr>
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T get(const toml::value& v);
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template<typename T, typename std::enable_if<detail::conjunction<
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detail::negation<detail::is_exact_toml_type<T>>, // not a toml::value
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detail::has_from_toml_method<T>, // but has from_toml(toml::value) memfn
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std::is_default_constructible<T> // and default constructible
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>::value, std::nullptr_t>::type = nullptr>
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T get(const toml::value& v);
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template<typename T, typename std::enable_if<detail::conjunction<
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detail::negation<detail::is_exact_toml_type<T>> // not a toml::value
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>::value, std::nullptr_t>::type = nullptr,
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std::size_t = sizeof(::toml::from<T>) // and has from<T> specialization
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>
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T get(const toml::value& v);
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// ============================================================================
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// array-like types; most likely STL container, like std::vector, etc.
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template<typename T, typename std::enable_if<detail::conjunction<
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detail::is_container<T>, // T is container
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detail::has_resize_method<T>, // T::resize(N) works
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detail::negation<detail::is_exact_toml_type<T>> // but not toml::array
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>::value, std::nullptr_t>::type>
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T get(const value& v)
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{
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using value_type = typename T::value_type;
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const auto& ar = v.cast<value_t::Array>();
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T container; container.resize(ar.size());
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std::transform(ar.cbegin(), ar.cend(), container.begin(),
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[](const value& x){return ::toml::get<value_type>(x);});
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return container;
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}
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// ============================================================================
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// array-like types; but does not have resize(); most likely std::array.
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template<typename T, typename std::enable_if<detail::conjunction<
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detail::is_container<T>, // T is container
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detail::negation<detail::has_resize_method<T>>, // no T::resize() exists
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detail::negation<detail::is_exact_toml_type<T>> // not toml::array
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>::value, std::nullptr_t>::type>
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T get(const value& v)
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{
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using value_type = typename T::value_type;
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const auto& ar = v.cast<value_t::Array>();
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T container;
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if(ar.size() != container.size())
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{
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throw std::out_of_range(detail::format_underline(concat_to_string(
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"[erorr] toml::get specified container size is ", container.size(),
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" but there are ", ar.size(), " elements in toml array."), {
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{std::addressof(detail::get_region(v)), "here"}
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}));
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}
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std::transform(ar.cbegin(), ar.cend(), container.begin(),
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[](const value& x){return ::toml::get<value_type>(x);});
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return container;
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}
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// ============================================================================
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// std::pair.
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template<typename T, typename std::enable_if<
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detail::is_std_pair<T>::value, std::nullptr_t>::type>
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T get(const value& v)
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{
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using first_type = typename T::first_type;
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using second_type = typename T::second_type;
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const auto& ar = v.cast<value_t::Array>();
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if(ar.size() != 2)
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{
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throw std::out_of_range(detail::format_underline(concat_to_string(
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"[erorr] toml::get specified std::pair but there are ", ar.size(),
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" elements in toml array."), {
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{std::addressof(detail::get_region(v)), "here"}
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}));
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}
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return std::make_pair(::toml::get<first_type >(ar.at(0)),
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::toml::get<second_type>(ar.at(1)));
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}
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// ============================================================================
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// std::tuple.
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namespace detail
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{
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template<typename T, std::size_t ...I>
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T get_tuple_impl(const toml::Array& a, index_sequence<I...>)
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{
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return std::make_tuple(
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::toml::get<typename std::tuple_element<I, T>::type>(a.at(I))...);
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}
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} // detail
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template<typename T, typename std::enable_if<
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detail::is_std_tuple<T>::value, std::nullptr_t>::type>
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T get(const value& v)
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{
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const auto& ar = v.cast<value_t::Array>();
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if(ar.size() != std::tuple_size<T>::value)
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{
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throw std::out_of_range(detail::format_underline(concat_to_string(
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"[erorr] toml::get specified std::tuple with ",
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std::tuple_size<T>::value, "elements, but there are ", ar.size(),
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" elements in toml array."), {
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{std::addressof(detail::get_region(v)), "here"}
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}));
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}
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return detail::get_tuple_impl<T>(ar,
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detail::make_index_sequence<std::tuple_size<T>::value>{});
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}
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// ============================================================================
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// map-like types; most likely STL map, like std::map or std::unordered_map.
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template<typename T, typename std::enable_if<detail::conjunction<
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detail::is_map<T>, // T is map
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detail::negation<detail::is_exact_toml_type<T>> // but not toml::table
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>::value, std::nullptr_t>::type>
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T get(const toml::value& v)
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{
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using key_type = typename T::key_type;
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using mapped_type = typename T::mapped_type;
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static_assert(std::is_convertible<std::string, key_type>::value,
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"toml::get only supports map type of which key_type is "
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"convertible from std::string.");
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T map;
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for(const auto& kv : v.cast<value_t::Table>())
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{
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map[key_type(kv.first)] = ::toml::get<mapped_type>(kv.second);
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}
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return map;
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}
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// ============================================================================
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// user-defined, but compatible types.
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template<typename T, typename std::enable_if<detail::conjunction<
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detail::negation<detail::is_exact_toml_type<T>>, // not a toml::value
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detail::has_from_toml_method<T>, // but has from_toml(toml::value) memfn
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std::is_default_constructible<T> // and default constructible
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>::value, std::nullptr_t>::type>
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T get(const toml::value& v)
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{
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T ud;
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ud.from_toml(v);
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return ud;
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}
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template<typename T, typename std::enable_if<detail::conjunction<
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detail::negation<detail::is_exact_toml_type<T>> // not a toml::value
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>::value, std::nullptr_t>::type, std::size_t> // and has from<T>
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T get(const toml::value& v)
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{
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return ::toml::from<T>::from_toml(v);
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}
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// ============================================================================
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// find and get
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template<typename T = ::toml::value>
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decltype(::toml::get<T>(std::declval<const ::toml::value&>()))
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find(const toml::table& tab, const toml::key& ky,
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std::string tablename = "unknown table")
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{
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if(tab.count(ky) == 0)
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{
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throw std::out_of_range(concat_to_string("[error] key \"", ky,
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"\" not found in ", tablename));
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}
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return ::toml::get<T>(tab.at(ky));
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}
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template<typename T = ::toml::value>
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decltype(::toml::get<T>(std::declval<::toml::value&>()))
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find(toml::table& tab, const toml::key& ky,
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std::string tablename = "unknown table")
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{
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if(tab.count(ky) == 0)
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{
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throw std::out_of_range(concat_to_string("[error] key \"", ky,
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"\" not found in ", tablename));
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}
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return ::toml::get<T>(tab[ky]);
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}
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template<typename T = ::toml::value>
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decltype(::toml::get<T>(std::declval<::toml::value&&>()))
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find(toml::table&& tab, const toml::key& ky,
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std::string tablename = "unknown table")
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{
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if(tab.count(ky) == 0)
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{
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throw std::out_of_range(concat_to_string("[error] key \"", ky,
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"\" not found in ", tablename));
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}
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return ::toml::get<T>(std::move(tab[ky]));
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}
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template<typename T = ::toml::value>
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decltype(::toml::get<T>(std::declval<const ::toml::value&>()))
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find(const toml::value& v, const toml::key& ky)
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{
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const auto& tab = ::toml::get<toml::table>(v);
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if(tab.count(ky) == 0)
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{
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throw std::out_of_range(detail::format_underline(concat_to_string(
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"[error] key \"", ky, "\" not found"), {
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{std::addressof(detail::get_region(v)), "in this table"}
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}));
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}
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return ::toml::get<T>(tab.at(ky));
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}
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template<typename T = ::toml::value>
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decltype(::toml::get<T>(std::declval<::toml::value&>()))
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find(toml::value& v, const toml::key& ky)
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{
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auto& tab = ::toml::get<toml::table>(v);
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if(tab.count(ky) == 0)
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{
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throw std::out_of_range(detail::format_underline(concat_to_string(
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"[error] key \"", ky, "\" not found"), {
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{std::addressof(detail::get_region(v)), "in this table"}
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}));
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}
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return ::toml::get<T>(tab.at(ky));
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}
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template<typename T = ::toml::value>
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decltype(::toml::get<T>(std::declval<::toml::value&&>()))
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find(toml::value&& v, const toml::key& ky)
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{
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auto tab = ::toml::get<toml::table>(std::move(v));
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if(tab.count(ky) == 0)
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{
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throw std::out_of_range(detail::format_underline(concat_to_string(
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"[error] key \"", ky, "\" not found"), {
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{std::addressof(detail::get_region(v)), "in this table"}
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}));
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}
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return ::toml::get<T>(std::move(tab[ky]));
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}
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// ============================================================================
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// get_or(value, fallback)
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// ----------------------------------------------------------------------------
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// specialization for the exact toml types (return type becomes lvalue ref)
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template<typename T, typename std::enable_if<
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detail::is_exact_toml_type<T>::value, std::nullptr_t>::type = nullptr>
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T const& get_or(const toml::value& v, const T& opt)
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{
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try
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{
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return get<typename std::remove_cv<
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typename std::remove_reference<T>::type>::type>(v);
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}
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catch(...)
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{
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return opt;
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}
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}
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template<typename T, typename std::enable_if<
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detail::is_exact_toml_type<T>::value, std::nullptr_t>::type = nullptr>
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T& get_or(toml::value& v, T& opt)
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{
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try
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{
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return get<typename std::remove_cv<
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typename std::remove_reference<T>::type>::type>(v);
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}
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catch(...)
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{
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return opt;
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}
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}
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template<typename T, typename std::enable_if<
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detail::is_exact_toml_type<T>::value, std::nullptr_t>::type = nullptr>
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T&& get_or(toml::value&& v, T&& opt)
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{
|
|
try
|
|
{
|
|
return get<typename std::remove_cv<
|
|
typename std::remove_reference<T>::type>::type>(v);
|
|
}
|
|
catch(...)
|
|
{
|
|
return opt;
|
|
}
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// specialization for std::string (return type becomes lvalue ref)
|
|
|
|
template<typename T, typename std::enable_if<
|
|
std::is_same<T, std::string>::value, std::nullptr_t>::type = nullptr>
|
|
std::string const& get_or(const toml::value& v, const T& opt)
|
|
{
|
|
try
|
|
{
|
|
return get<std::string>(v);
|
|
}
|
|
catch(...)
|
|
{
|
|
return opt;
|
|
}
|
|
}
|
|
template<typename T, typename std::enable_if<
|
|
std::is_same<T, std::string>::value, std::nullptr_t>::type = nullptr>
|
|
std::string& get_or(toml::value& v, T& opt)
|
|
{
|
|
try
|
|
{
|
|
return get<std::string>(v);
|
|
}
|
|
catch(...)
|
|
{
|
|
return opt;
|
|
}
|
|
}
|
|
template<typename T, typename std::enable_if<
|
|
std::is_same<T, std::string>::value, std::nullptr_t>::type = nullptr>
|
|
std::string get_or(toml::value&& v, T&& opt)
|
|
{
|
|
try
|
|
{
|
|
return get<std::string>(v);
|
|
}
|
|
catch(...)
|
|
{
|
|
return opt;
|
|
}
|
|
}
|
|
template<typename T, typename std::enable_if<
|
|
detail::is_string_literal<typename std::remove_reference<T>::type>::value,
|
|
std::nullptr_t>::type = nullptr>
|
|
std::string get_or(const toml::value& v, T&& opt)
|
|
{
|
|
try
|
|
{
|
|
return get<std::string>(v);
|
|
}
|
|
catch(...)
|
|
{
|
|
return std::string(opt);
|
|
}
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// others (require type conversion and return type cannot be lvalue reference)
|
|
|
|
template<typename T, typename std::enable_if<detail::conjunction<
|
|
detail::negation<detail::is_exact_toml_type<T>>,
|
|
detail::negation<std::is_same<T, std::string>>,
|
|
detail::negation<detail::is_string_literal<typename std::remove_reference<T>::type>>
|
|
>::value, std::nullptr_t>::type = nullptr>
|
|
T get_or(const toml::value& v, T&& opt)
|
|
{
|
|
try
|
|
{
|
|
return get<typename std::remove_cv<
|
|
typename std::remove_reference<T>::type>::type>(v);
|
|
}
|
|
catch(...)
|
|
{
|
|
return opt;
|
|
}
|
|
}
|
|
|
|
// ===========================================================================
|
|
// get_or(table, key, fallback)
|
|
//
|
|
// DEPRECATED: use find_or instead.
|
|
|
|
template<typename T>
|
|
TOML11_MARK_AS_DEPRECATED("use toml::find_or(table, key, opt) instead.")
|
|
auto get_or(const toml::table& tab, const toml::key& ky, T&& opt)
|
|
-> decltype(get_or(std::declval<value const&>(), std::forward<T>(opt)))
|
|
{
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return ::toml::get_or(tab.at(ky), std::forward<T>(opt));
|
|
}
|
|
template<typename T>
|
|
TOML11_MARK_AS_DEPRECATED("use toml::find_or(table, key, opt) instead.")
|
|
auto get_or(toml::table& tab, const toml::key& ky, T&& opt)
|
|
-> decltype(get_or(std::declval<value&>(), std::forward<T>(opt)))
|
|
{
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return ::toml::get_or(tab[ky], std::forward<T>(opt));
|
|
}
|
|
template<typename T>
|
|
TOML11_MARK_AS_DEPRECATED("use toml::find_or(table, key, opt) instead.")
|
|
auto get_or(toml::table&& tab, const toml::key& ky, T&& opt)
|
|
-> decltype(get_or(std::declval<value&&>(), std::forward<T>(opt)))
|
|
{
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return ::toml::get_or(std::move(tab[ky]), std::forward<T>(opt));
|
|
}
|
|
|
|
template<typename T>
|
|
TOML11_MARK_AS_DEPRECATED("use toml::find_or(value, key, opt) instead.")
|
|
auto get_or(const toml::value& v, const toml::key& ky, T&& opt)
|
|
-> decltype(get_or(std::declval<value const&>(), std::forward<T>(opt)))
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
const auto& tab = toml::get<toml::table>(v);
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return ::toml::get_or(tab.at(ky), std::forward<T>(opt));
|
|
}
|
|
template<typename T>
|
|
TOML11_MARK_AS_DEPRECATED("use toml::find_or(value, key, opt) instead.")
|
|
auto get_or(toml::value& v, const toml::key& ky, T&& opt)
|
|
-> decltype(get_or(std::declval<value&>(), std::forward<T>(opt)))
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
auto& tab = toml::get<toml::table>(v);
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return ::toml::get_or(tab[ky], std::forward<T>(opt));
|
|
}
|
|
template<typename T>
|
|
TOML11_MARK_AS_DEPRECATED("use toml::find_or(value, key, opt) instead.")
|
|
auto get_or(toml::value&& v, const toml::key& ky, T&& opt)
|
|
-> decltype(get_or(std::declval<value&&>(), std::forward<T>(opt)))
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
auto tab = toml::get<toml::table>(std::move(v));
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return ::toml::get_or(std::move(tab[ky]), std::forward<T>(opt));
|
|
}
|
|
|
|
// ===========================================================================
|
|
// find_or(value, key, fallback)
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// exact types (return type can be a reference)
|
|
template<typename T, typename std::enable_if<
|
|
detail::is_exact_toml_type<T>::value, std::nullptr_t>::type = nullptr>
|
|
T const& find_or(const toml::value& v, const toml::key& ky, const T& opt)
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
const auto& tab = toml::get<toml::table>(v);
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(tab.at(ky), opt);
|
|
}
|
|
|
|
template<typename T, typename std::enable_if<
|
|
detail::is_exact_toml_type<T>::value, std::nullptr_t>::type = nullptr>
|
|
T& find_or(toml::value& v, const toml::key& ky, T& opt)
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
auto& tab = toml::get<toml::table>(v);
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(tab[ky], opt);
|
|
}
|
|
|
|
template<typename T, typename std::enable_if<
|
|
detail::is_exact_toml_type<T>::value, std::nullptr_t>::type = nullptr>
|
|
T&& find_or(toml::value&& v, const toml::key& ky, T&& opt)
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
auto tab = toml::get<toml::table>(std::move(v));
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(std::move(tab[ky]), std::forward<T>(opt));
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// std::string (return type can be a reference)
|
|
template<typename T, typename std::enable_if<
|
|
std::is_same<T, std::string>::value, std::nullptr_t>::type = nullptr>
|
|
std::string const& find_or(const toml::value& v, const toml::key& ky, const T& opt)
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
const auto& tab = toml::get<toml::table>(v);
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(tab.at(ky), opt);
|
|
}
|
|
template<typename T, typename std::enable_if<
|
|
std::is_same<T, std::string>::value, std::nullptr_t>::type = nullptr>
|
|
std::string& find_or(toml::value& v, const toml::key& ky, T& opt)
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
auto& tab = toml::get<toml::table>(v);
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(tab[ky], opt);
|
|
}
|
|
template<typename T, typename std::enable_if<
|
|
std::is_same<T, std::string>::value, std::nullptr_t>::type = nullptr>
|
|
std::string find_or(toml::value&& v, const toml::key& ky, T&& opt)
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
auto tab = toml::get<toml::table>(std::move(v));
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(std::move(tab[ky]), std::forward<T>(opt));
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// string literal (deduced as std::string)
|
|
template<typename T, typename std::enable_if<
|
|
detail::is_string_literal<typename std::remove_reference<T>::type>::value,
|
|
std::nullptr_t>::type = nullptr>
|
|
std::string find_or(const toml::value& v, const toml::key& ky, T&& opt)
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
const auto& tab = toml::get<toml::table>(v);
|
|
if(tab.count(ky) == 0) {return std::string(opt);}
|
|
return get_or(tab.at(ky), std::forward<T>(opt));
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// others (require type conversion and return type cannot be lvalue reference)
|
|
template<typename T, typename std::enable_if<detail::conjunction<
|
|
detail::negation<detail::is_exact_toml_type<T>>,
|
|
detail::negation<std::is_same<T, std::string>>,
|
|
detail::negation<detail::is_string_literal<typename std::remove_reference<T>::type>>
|
|
>::value, std::nullptr_t>::type = nullptr>
|
|
T find_or(const toml::value& v, const toml::key& ky, T&& opt)
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
const auto& tab = toml::get<toml::table>(v);
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(tab.at(ky), std::forward<T>(opt));
|
|
}
|
|
|
|
// ===========================================================================
|
|
// find_or(table, key, opt)
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// exact types (return type can be a reference)
|
|
template<typename T, typename std::enable_if<
|
|
detail::is_exact_toml_type<T>::value, std::nullptr_t>::type = nullptr>
|
|
T const& find_or(const toml::table& tab, const toml::key& ky, const T& opt)
|
|
{
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(tab.at(ky), opt);
|
|
}
|
|
|
|
template<typename T, typename std::enable_if<
|
|
detail::is_exact_toml_type<T>::value, std::nullptr_t>::type = nullptr>
|
|
T& find_or(toml::table& tab, const toml::key& ky, T& opt)
|
|
{
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(tab[ky], opt);
|
|
}
|
|
|
|
template<typename T, typename std::enable_if<
|
|
detail::is_exact_toml_type<T>::value, std::nullptr_t>::type = nullptr>
|
|
T&& find_or(toml::table&& tab, const toml::key& ky, T&& opt)
|
|
{
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(std::move(tab[ky]), std::forward<T>(opt));
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// std::string (return type can be a reference)
|
|
template<typename T, typename std::enable_if<
|
|
std::is_same<T, std::string>::value, std::nullptr_t>::type = nullptr>
|
|
std::string const& find_or(const toml::table& tab, const toml::key& ky, const T& opt)
|
|
{
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(tab.at(ky), opt);
|
|
}
|
|
template<typename T, typename std::enable_if<
|
|
std::is_same<T, std::string>::value, std::nullptr_t>::type = nullptr>
|
|
std::string& find_or(toml::table& tab, const toml::key& ky, T& opt)
|
|
{
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(tab[ky], opt);
|
|
}
|
|
template<typename T, typename std::enable_if<
|
|
std::is_same<T, std::string>::value, std::nullptr_t>::type = nullptr>
|
|
std::string find_or(toml::table&& tab, const toml::key& ky, T&& opt)
|
|
{
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(std::move(tab[ky]), std::forward<T>(opt));
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// string literal (deduced as std::string)
|
|
template<typename T, typename std::enable_if<
|
|
detail::is_string_literal<typename std::remove_reference<T>::type>::value,
|
|
std::nullptr_t>::type = nullptr>
|
|
std::string find_or(const toml::table& tab, const toml::key& ky, T&& opt)
|
|
{
|
|
if(tab.count(ky) == 0) {return std::string(opt);}
|
|
return get_or(tab.at(ky), std::forward<T>(opt));
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// others (require type conversion and return type cannot be lvalue reference)
|
|
template<typename T, typename std::enable_if<detail::conjunction<
|
|
detail::negation<detail::is_exact_toml_type<T>>,
|
|
detail::negation<std::is_same<T, std::string>>,
|
|
detail::negation<detail::is_string_literal<typename std::remove_reference<T>::type>>
|
|
>::value, std::nullptr_t>::type = nullptr>
|
|
T find_or(const toml::table& tab, const toml::key& ky, T&& opt)
|
|
{
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(tab.at(ky), std::forward<T>(opt));
|
|
}
|
|
|
|
// ============================================================================
|
|
// expect
|
|
|
|
template<typename T>
|
|
result<T, std::string> expect(const toml::value& v) noexcept
|
|
{
|
|
try
|
|
{
|
|
return ok(get<T>(v));
|
|
}
|
|
catch(const std::exception& e)
|
|
{
|
|
return err(e.what());
|
|
}
|
|
}
|
|
template<typename T>
|
|
result<T, std::string> expect(const toml::value& v, const toml::key& k) noexcept
|
|
{
|
|
try
|
|
{
|
|
return ok(find<T>(v, k));
|
|
}
|
|
catch(const std::exception& e)
|
|
{
|
|
return err(e.what());
|
|
}
|
|
}
|
|
template<typename T>
|
|
result<T, std::string> expect(const toml::table& t, const toml::key& k,
|
|
std::string tablename = "unknown table") noexcept
|
|
{
|
|
try
|
|
{
|
|
return ok(find<T>(t, k, std::move(tablename)));
|
|
}
|
|
catch(const std::exception& e)
|
|
{
|
|
return err(e.what());
|
|
}
|
|
}
|
|
|
|
} // toml
|
|
#endif// TOML11_GET
|