1118 lines
39 KiB
C++
1118 lines
39 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 <algorithm>
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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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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 C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::is_exact_toml_type<T, basic_value<C, M, V>>::value, T> &
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get(basic_value<C, M, V>& v)
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{
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return v.template cast<detail::type_to_enum<T, basic_value<C, M, V>>::value>();
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}
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::is_exact_toml_type<T, basic_value<C, M, V>>::value, T> const&
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get(const basic_value<C, M, V>& v)
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{
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return v.template cast<detail::type_to_enum<T, basic_value<C, M, V>>::value>();
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}
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::is_exact_toml_type<T, basic_value<C, M, V>>::value, T>
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get(basic_value<C, M, V>&& v)
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{
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return T(std::move(v).template cast<detail::type_to_enum<T, basic_value<C, M, V>>::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 C,
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template<typename ...> class M, template<typename ...> class V>
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inline detail::enable_if_t<std::is_same<T, basic_value<C, M, V>>::value, T>&
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get(basic_value<C, M, V>& v)
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{
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return v;
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}
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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inline detail::enable_if_t<std::is_same<T, basic_value<C, M, V>>::value, T> const&
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get(const basic_value<C, M, V>& v)
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{
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return v;
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}
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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inline detail::enable_if_t<std::is_same<T, basic_value<C, M, V>>::value, T>
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get(basic_value<C, M, V>&& v)
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{
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return basic_value<C, M, V>(std::move(v));
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}
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// ============================================================================
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// T == toml::basic_value<C2, M2, V2>; basic_value -> basic_value
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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inline detail::enable_if_t<detail::conjunction<detail::is_basic_value<T>,
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detail::negation<std::is_same<T, basic_value<C, M, V>>>
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>::value, T>
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get(const basic_value<C, M, V>& v)
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{
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return T(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 C,
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template<typename ...> class M, template<typename ...> class V>
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inline detail::enable_if_t<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< // but not toml::integer
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detail::is_exact_toml_type<T, basic_value<C, M, V>>>
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>::value, T>
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get(const basic_value<C, M, V>& v)
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{
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return static_cast<T>(v.as_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 C,
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template<typename ...> class M, template<typename ...> class V>
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inline detail::enable_if_t<detail::conjunction<
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std::is_floating_point<T>, // T is floating_point
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detail::negation< // but not toml::floating
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detail::is_exact_toml_type<T, basic_value<C, M, V>>>
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>::value, T>
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get(const basic_value<C, M, V>& v)
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{
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return static_cast<T>(v.as_floating());
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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 C,
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template<typename ...> class M, template<typename ...> class V>
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inline detail::enable_if_t<std::is_same<T, std::string>::value, std::string>&
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get(basic_value<C, M, V>& v)
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{
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return v.as_string().str;
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}
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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inline detail::enable_if_t<std::is_same<T, std::string>::value, std::string> const&
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get(const basic_value<C, M, V>& v)
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{
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return v.as_string().str;
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}
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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inline detail::enable_if_t<std::is_same<T, std::string>::value, std::string>
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get(basic_value<C, M, V>&& v)
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{
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return std::string(std::move(v.as_string().str));
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}
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// ============================================================================
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// std::string_view
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#if defined(TOML11_USING_STRING_VIEW) && TOML11_USING_STRING_VIEW>0
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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inline detail::enable_if_t<std::is_same<T, std::string_view>::value, std::string_view>
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get(const basic_value<C, M, V>& v)
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{
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return std::string_view(v.as_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 C,
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template<typename ...> class M, template<typename ...> class V>
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inline detail::enable_if_t<detail::is_chrono_duration<T>::value, T>
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get(const basic_value<C, M, V>& v)
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{
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return std::chrono::duration_cast<T>(
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std::chrono::nanoseconds(v.as_local_time()));
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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 C,
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template<typename ...> class M, template<typename ...> class V>
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inline detail::enable_if_t<
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std::is_same<std::chrono::system_clock::time_point, T>::value, T>
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get(const basic_value<C, M, V>& v)
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{
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switch(v.type())
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{
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case value_t::local_date:
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{
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return std::chrono::system_clock::time_point(v.as_local_date());
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}
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case value_t::local_datetime:
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{
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return std::chrono::system_clock::time_point(v.as_local_datetime());
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}
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case value_t::offset_datetime:
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{
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return std::chrono::system_clock::time_point(v.as_offset_datetime());
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}
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default:
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{
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throw type_error(detail::format_underline("toml::value: "
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"bad_cast to std::chrono::system_clock::time_point", {
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{v.location(), concat_to_string("the actual type is ", v.type())}
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}), v.location());
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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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// array-like type with push_back(value) method
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::conjunction<
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detail::is_container<T>, // T is a container
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detail::has_push_back_method<T>, // T::push_back(value) works
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detail::negation< // but not toml::array
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detail::is_exact_toml_type<T, basic_value<C, M, V>>>
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>::value, T>
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get(const basic_value<C, M, V>&);
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// array-like type without push_back(value) method
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::conjunction<
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detail::is_container<T>, // T is a container
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detail::negation<detail::has_push_back_method<T>>, // w/o push_back(...)
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detail::negation< // not toml::array
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detail::is_exact_toml_type<T, basic_value<C, M, V>>>
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>::value, T>
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get(const basic_value<C, M, V>&);
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// std::pair<T1, T2>
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::is_std_pair<T>::value, T>
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get(const basic_value<C, M, V>&);
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// std::tuple<T1, T2, ...>
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::is_std_tuple<T>::value, T>
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get(const basic_value<C, M, V>&);
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// map-like classes
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::conjunction<
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detail::is_map<T>, // T is map
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detail::negation< // but not toml::table
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detail::is_exact_toml_type<T, basic_value<C, M, V>>>
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>::value, T>
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get(const basic_value<C, M, V>&);
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// T.from_toml(v)
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::conjunction<
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detail::negation< // not a toml::* type
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detail::is_exact_toml_type<T, basic_value<C, M, V>>>,
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detail::has_from_toml_method<T, C, M, V>, // but has from_toml(toml::value)
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std::is_default_constructible<T> // and default constructible
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>::value, T>
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get(const basic_value<C, M, V>&);
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// toml::from<T>::from_toml(v)
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::has_specialized_from<T>::value, T>
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get(const basic_value<C, M, V>&);
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// T(const toml::value&) and T is not toml::basic_value,
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// and it does not have `from<T>` nor `from_toml`.
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::conjunction<
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detail::negation<detail::is_basic_value<T>>,
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std::is_constructible<T, const basic_value<C, M, V>&>,
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detail::negation<detail::has_from_toml_method<T, C, M, V>>,
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detail::negation<detail::has_specialized_from<T>>
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>::value, T>
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get(const basic_value<C, M, 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 C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::conjunction<
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detail::is_container<T>, // T is a container
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detail::has_push_back_method<T>, // container.push_back(elem) works
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detail::negation< // but not toml::array
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detail::is_exact_toml_type<T, basic_value<C, M, V>>>
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>::value, T>
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get(const basic_value<C, M, V>& v)
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{
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using value_type = typename T::value_type;
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const auto& ary = v.as_array();
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T container;
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try_reserve(container, ary.size());
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for(const auto& elem : ary)
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{
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container.push_back(get<value_type>(elem));
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}
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return container;
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}
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// ============================================================================
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// std::forward_list does not have push_back, insert, or emplace.
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// It has insert_after, emplace_after, push_front.
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::is_std_forward_list<T>::value, T>
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get(const basic_value<C, M, V>& v)
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{
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using value_type = typename T::value_type;
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T container;
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for(const auto& elem : v.as_array())
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{
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container.push_front(get<value_type>(elem));
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}
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container.reverse();
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return container;
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}
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// ============================================================================
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// array-like types, without push_back(). most likely [std|boost]::array.
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::conjunction<
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detail::is_container<T>, // T is a container
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detail::negation<detail::has_push_back_method<T>>, // w/o push_back
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detail::negation< // T is not toml::array
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detail::is_exact_toml_type<T, basic_value<C, M, V>>>
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>::value, T>
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get(const basic_value<C, M, V>& v)
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{
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using value_type = typename T::value_type;
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const auto& ar = v.as_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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"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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{v.location(), "here"}
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}));
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}
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for(std::size_t i=0; i<ar.size(); ++i)
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{
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container[i] = ::toml::get<value_type>(ar[i]);
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}
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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 C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::is_std_pair<T>::value, T>
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get(const basic_value<C, M, V>& 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.as_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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"toml::get: specified std::pair but there are ", ar.size(),
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" elements in toml array."), {{v.location(), "here"}}));
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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, typename Array, std::size_t ... I>
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T get_tuple_impl(const 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 C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::is_std_tuple<T>::value, T>
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get(const basic_value<C, M, V>& v)
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{
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const auto& ar = v.as_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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"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."), {{v.location(), "here"}}));
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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 C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::conjunction<
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detail::is_map<T>, // T is map
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detail::negation< // but not toml::array
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detail::is_exact_toml_type<T, basic_value<C, M, V>>>
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>::value, T>
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get(const basic_value<C, M, V>& 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.as_table())
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{
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map.emplace(key_type(kv.first), 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 C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::conjunction<
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detail::negation< // not a toml::* type
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detail::is_exact_toml_type<T, basic_value<C, M, V>>>,
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detail::has_from_toml_method<T, C, M, V>, // but has from_toml(toml::value) memfn
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std::is_default_constructible<T> // and default constructible
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>::value, T>
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get(const basic_value<C, M, V>& 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 C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::has_specialized_from<T>::value, T>
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get(const basic_value<C, M, V>& v)
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{
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return ::toml::from<T>::from_toml(v);
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}
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template<typename T, typename C,
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template<typename ...> class M, template<typename ...> class V>
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detail::enable_if_t<detail::conjunction<
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detail::negation<detail::is_basic_value<T>>, // T is not a toml::value
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std::is_constructible<T, const basic_value<C, M, V>&>, // T is constructible from toml::value
|
|
detail::negation<detail::has_from_toml_method<T, C, M, V>>, // and T does not have T.from_toml(v);
|
|
detail::negation<detail::has_specialized_from<T>> // and T does not have toml::from<T>{};
|
|
>::value, T>
|
|
get(const basic_value<C, M, V>& v)
|
|
{
|
|
return T(v);
|
|
}
|
|
|
|
// ============================================================================
|
|
// find
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// these overloads do not require to set T. and returns value itself.
|
|
template<typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
basic_value<C, M, V> const& find(const basic_value<C, M, V>& v, const key& ky)
|
|
{
|
|
const auto& tab = v.as_table();
|
|
if(tab.count(ky) == 0)
|
|
{
|
|
detail::throw_key_not_found_error(v, ky);
|
|
}
|
|
return tab.at(ky);
|
|
}
|
|
template<typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
basic_value<C, M, V>& find(basic_value<C, M, V>& v, const key& ky)
|
|
{
|
|
auto& tab = v.as_table();
|
|
if(tab.count(ky) == 0)
|
|
{
|
|
detail::throw_key_not_found_error(v, ky);
|
|
}
|
|
return tab.at(ky);
|
|
}
|
|
template<typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
basic_value<C, M, V> find(basic_value<C, M, V>&& v, const key& ky)
|
|
{
|
|
typename basic_value<C, M, V>::table_type tab = std::move(v).as_table();
|
|
if(tab.count(ky) == 0)
|
|
{
|
|
detail::throw_key_not_found_error(v, ky);
|
|
}
|
|
return basic_value<C, M, V>(std::move(tab.at(ky)));
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// find(value, idx)
|
|
template<typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
basic_value<C, M, V> const&
|
|
find(const basic_value<C, M, V>& v, const std::size_t idx)
|
|
{
|
|
const auto& ary = v.as_array();
|
|
if(ary.size() <= idx)
|
|
{
|
|
throw std::out_of_range(detail::format_underline(concat_to_string(
|
|
"index ", idx, " is out of range"), {{v.location(), "in this array"}}));
|
|
}
|
|
return ary.at(idx);
|
|
}
|
|
template<typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
basic_value<C, M, V>& find(basic_value<C, M, V>& v, const std::size_t idx)
|
|
{
|
|
auto& ary = v.as_array();
|
|
if(ary.size() <= idx)
|
|
{
|
|
throw std::out_of_range(detail::format_underline(concat_to_string(
|
|
"index ", idx, " is out of range"), {{v.location(), "in this array"}}));
|
|
}
|
|
return ary.at(idx);
|
|
}
|
|
template<typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
basic_value<C, M, V> find(basic_value<C, M, V>&& v, const std::size_t idx)
|
|
{
|
|
auto& ary = v.as_array();
|
|
if(ary.size() <= idx)
|
|
{
|
|
throw std::out_of_range(detail::format_underline(concat_to_string(
|
|
"index ", idx, " is out of range"), {{v.location(), "in this array"}}));
|
|
}
|
|
return basic_value<C, M, V>(std::move(ary.at(idx)));
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// find<T>(value, key);
|
|
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
decltype(::toml::get<T>(std::declval<basic_value<C, M, V> const&>()))
|
|
find(const basic_value<C, M, V>& v, const key& ky)
|
|
{
|
|
const auto& tab = v.as_table();
|
|
if(tab.count(ky) == 0)
|
|
{
|
|
detail::throw_key_not_found_error(v, ky);
|
|
}
|
|
return ::toml::get<T>(tab.at(ky));
|
|
}
|
|
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
decltype(::toml::get<T>(std::declval<basic_value<C, M, V>&>()))
|
|
find(basic_value<C, M, V>& v, const key& ky)
|
|
{
|
|
auto& tab = v.as_table();
|
|
if(tab.count(ky) == 0)
|
|
{
|
|
detail::throw_key_not_found_error(v, ky);
|
|
}
|
|
return ::toml::get<T>(tab.at(ky));
|
|
}
|
|
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
decltype(::toml::get<T>(std::declval<basic_value<C, M, V>&&>()))
|
|
find(basic_value<C, M, V>&& v, const key& ky)
|
|
{
|
|
typename basic_value<C, M, V>::table_type tab = std::move(v).as_table();
|
|
if(tab.count(ky) == 0)
|
|
{
|
|
detail::throw_key_not_found_error(v, ky);
|
|
}
|
|
return ::toml::get<T>(std::move(tab.at(ky)));
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// find<T>(value, idx)
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
decltype(::toml::get<T>(std::declval<basic_value<C, M, V> const&>()))
|
|
find(const basic_value<C, M, V>& v, const std::size_t idx)
|
|
{
|
|
const auto& ary = v.as_array();
|
|
if(ary.size() <= idx)
|
|
{
|
|
throw std::out_of_range(detail::format_underline(concat_to_string(
|
|
"index ", idx, " is out of range"), {{v.location(), "in this array"}}));
|
|
}
|
|
return ::toml::get<T>(ary.at(idx));
|
|
}
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
decltype(::toml::get<T>(std::declval<basic_value<C, M, V>&>()))
|
|
find(basic_value<C, M, V>& v, const std::size_t idx)
|
|
{
|
|
auto& ary = v.as_array();
|
|
if(ary.size() <= idx)
|
|
{
|
|
throw std::out_of_range(detail::format_underline(concat_to_string(
|
|
"index ", idx, " is out of range"), {{v.location(), "in this array"}}));
|
|
}
|
|
return ::toml::get<T>(ary.at(idx));
|
|
}
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
decltype(::toml::get<T>(std::declval<basic_value<C, M, V>&&>()))
|
|
find(basic_value<C, M, V>&& v, const std::size_t idx)
|
|
{
|
|
typename basic_value<C, M, V>::array_type ary = std::move(v).as_array();
|
|
if(ary.size() <= idx)
|
|
{
|
|
throw std::out_of_range(detail::format_underline(concat_to_string(
|
|
"index ", idx, " is out of range"), {{v.location(), "in this array"}}));
|
|
}
|
|
return ::toml::get<T>(std::move(ary.at(idx)));
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// toml::find(toml::value, toml::key, Ts&& ... keys)
|
|
|
|
namespace detail
|
|
{
|
|
// It suppresses warnings by -Wsign-conversion. Let's say we have the following
|
|
// code.
|
|
// ```cpp
|
|
// const auto x = toml::find<std::string>(data, "array", 0);
|
|
// ```
|
|
// Here, the type of literal number `0` is `int`. `int` is a signed integer.
|
|
// `toml::find` takes `std::size_t` as an index. So it causes implicit sign
|
|
// conversion and `-Wsign-conversion` warns about it. Using `0u` instead of `0`
|
|
// suppresses the warning, but it makes user code messy.
|
|
// To suppress this warning, we need to be aware of type conversion caused
|
|
// by `toml::find(v, key1, key2, ... keys)`. But the thing is that the types of
|
|
// keys can be any combination of {string-like, size_t-like}. Of course we can't
|
|
// write down all the combinations. Thus we need to use some function that
|
|
// recognize the type of argument and cast it into `std::string` or
|
|
// `std::size_t` depending on the context.
|
|
// `key_cast` does the job. It has 2 overloads. One is invoked when the
|
|
// argument type is an integer and cast the argument into `std::size_t`. The
|
|
// other is invoked when the argument type is not an integer, possibly one of
|
|
// std::string, const char[N] or const char*, and construct std::string from
|
|
// the argument.
|
|
// `toml::find(v, k1, k2, ... ks)` uses `key_cast` before passing `ks` to
|
|
// `toml::find(v, k)` to suppress -Wsign-conversion.
|
|
|
|
template<typename T>
|
|
enable_if_t<conjunction<std::is_integral<remove_cvref_t<T>>,
|
|
negation<std::is_same<remove_cvref_t<T>, bool>>>::value, std::size_t>
|
|
key_cast(T&& v) noexcept
|
|
{
|
|
return std::size_t(v);
|
|
}
|
|
template<typename T>
|
|
enable_if_t<negation<conjunction<std::is_integral<remove_cvref_t<T>>,
|
|
negation<std::is_same<remove_cvref_t<T>, bool>>>>::value, std::string>
|
|
key_cast(T&& v) noexcept
|
|
{
|
|
return std::string(std::forward<T>(v));
|
|
}
|
|
} // detail
|
|
|
|
template<typename C,
|
|
template<typename ...> class M, template<typename ...> class V,
|
|
typename Key1, typename Key2, typename ... Keys>
|
|
const basic_value<C, M, V>&
|
|
find(const basic_value<C, M, V>& v, Key1&& k1, Key2&& k2, Keys&& ... keys)
|
|
{
|
|
return ::toml::find(::toml::find(v, detail::key_cast(k1)),
|
|
detail::key_cast(k2), std::forward<Keys>(keys)...);
|
|
}
|
|
template<typename C,
|
|
template<typename ...> class M, template<typename ...> class V,
|
|
typename Key1, typename Key2, typename ... Keys>
|
|
basic_value<C, M, V>&
|
|
find(basic_value<C, M, V>& v, Key1&& k1, Key2&& k2, Keys&& ... keys)
|
|
{
|
|
return ::toml::find(::toml::find(v, detail::key_cast(k1)),
|
|
detail::key_cast(k2), std::forward<Keys>(keys)...);
|
|
}
|
|
template<typename C,
|
|
template<typename ...> class M, template<typename ...> class V,
|
|
typename Key1, typename Key2, typename ... Keys>
|
|
basic_value<C, M, V>
|
|
find(basic_value<C, M, V>&& v, Key1&& k1, Key2&& k2, Keys&& ... keys)
|
|
{
|
|
return ::toml::find(::toml::find(std::move(v), std::forward<Key1>(k1)),
|
|
detail::key_cast(k2), std::forward<Keys>(keys)...);
|
|
}
|
|
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V,
|
|
typename Key1, typename Key2, typename ... Keys>
|
|
decltype(::toml::get<T>(std::declval<const basic_value<C, M, V>&>()))
|
|
find(const basic_value<C, M, V>& v, Key1&& k1, Key2&& k2, Keys&& ... keys)
|
|
{
|
|
return ::toml::find<T>(::toml::find(v, detail::key_cast(k1)),
|
|
detail::key_cast(k2), std::forward<Keys>(keys)...);
|
|
}
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V,
|
|
typename Key1, typename Key2, typename ... Keys>
|
|
decltype(::toml::get<T>(std::declval<basic_value<C, M, V>&>()))
|
|
find(basic_value<C, M, V>& v, Key1&& k1, Key2&& k2, Keys&& ... keys)
|
|
{
|
|
return ::toml::find<T>(::toml::find(v, detail::key_cast(k1)),
|
|
detail::key_cast(k2), std::forward<Keys>(keys)...);
|
|
}
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V,
|
|
typename Key1, typename Key2, typename ... Keys>
|
|
decltype(::toml::get<T>(std::declval<basic_value<C, M, V>&&>()))
|
|
find(basic_value<C, M, V>&& v, Key1&& k1, Key2&& k2, Keys&& ... keys)
|
|
{
|
|
return ::toml::find<T>(::toml::find(std::move(v), detail::key_cast(k1)),
|
|
detail::key_cast(k2), std::forward<Keys>(keys)...);
|
|
}
|
|
|
|
// ============================================================================
|
|
// get_or(value, fallback)
|
|
|
|
template<typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
basic_value<C, M, V> const&
|
|
get_or(const basic_value<C, M, V>& v, const basic_value<C, M, V>&)
|
|
{
|
|
return v;
|
|
}
|
|
template<typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
basic_value<C, M, V>&
|
|
get_or(basic_value<C, M, V>& v, basic_value<C, M, V>&)
|
|
{
|
|
return v;
|
|
}
|
|
template<typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
basic_value<C, M, V>
|
|
get_or(basic_value<C, M, V>&& v, basic_value<C, M, V>&&)
|
|
{
|
|
return v;
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// specialization for the exact toml types (return type becomes lvalue ref)
|
|
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<
|
|
detail::is_exact_toml_type<T, basic_value<C, M, V>>::value, T> const&
|
|
get_or(const basic_value<C, M, V>& v, const T& opt)
|
|
{
|
|
try
|
|
{
|
|
return get<detail::remove_cvref_t<T>>(v);
|
|
}
|
|
catch(...)
|
|
{
|
|
return opt;
|
|
}
|
|
}
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<
|
|
detail::is_exact_toml_type<T, basic_value<C, M, V>>::value, T>&
|
|
get_or(basic_value<C, M, V>& v, T& opt)
|
|
{
|
|
try
|
|
{
|
|
return get<detail::remove_cvref_t<T>>(v);
|
|
}
|
|
catch(...)
|
|
{
|
|
return opt;
|
|
}
|
|
}
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<detail::is_exact_toml_type<detail::remove_cvref_t<T>,
|
|
basic_value<C, M, V>>::value, detail::remove_cvref_t<T>>
|
|
get_or(basic_value<C, M, V>&& v, T&& opt)
|
|
{
|
|
try
|
|
{
|
|
return get<detail::remove_cvref_t<T>>(std::move(v));
|
|
}
|
|
catch(...)
|
|
{
|
|
return detail::remove_cvref_t<T>(std::forward<T>(opt));
|
|
}
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// specialization for std::string (return type becomes lvalue ref)
|
|
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<std::is_same<detail::remove_cvref_t<T>, std::string>::value,
|
|
std::string> const&
|
|
get_or(const basic_value<C, M, V>& v, const T& opt)
|
|
{
|
|
try
|
|
{
|
|
return v.as_string().str;
|
|
}
|
|
catch(...)
|
|
{
|
|
return opt;
|
|
}
|
|
}
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<std::is_same<T, std::string>::value, std::string>&
|
|
get_or(basic_value<C, M, V>& v, T& opt)
|
|
{
|
|
try
|
|
{
|
|
return v.as_string().str;
|
|
}
|
|
catch(...)
|
|
{
|
|
return opt;
|
|
}
|
|
}
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<
|
|
std::is_same<detail::remove_cvref_t<T>, std::string>::value, std::string>
|
|
get_or(basic_value<C, M, V>&& v, T&& opt)
|
|
{
|
|
try
|
|
{
|
|
return std::move(v.as_string().str);
|
|
}
|
|
catch(...)
|
|
{
|
|
return std::string(std::forward<T>(opt));
|
|
}
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// specialization for string literal
|
|
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<detail::is_string_literal<
|
|
typename std::remove_reference<T>::type>::value, std::string>
|
|
get_or(const basic_value<C, M, V>& v, T&& opt)
|
|
{
|
|
try
|
|
{
|
|
return std::move(v.as_string().str);
|
|
}
|
|
catch(...)
|
|
{
|
|
return std::string(std::forward<T>(opt));
|
|
}
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// others (require type conversion and return type cannot be lvalue reference)
|
|
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<detail::conjunction<
|
|
detail::negation<detail::is_exact_toml_type<detail::remove_cvref_t<T>,
|
|
basic_value<C, M, V>>>,
|
|
detail::negation<std::is_same<std::string, detail::remove_cvref_t<T>>>,
|
|
detail::negation<detail::is_string_literal<
|
|
typename std::remove_reference<T>::type>>
|
|
>::value, detail::remove_cvref_t<T>>
|
|
get_or(const basic_value<C, M, V>& v, T&& opt)
|
|
{
|
|
try
|
|
{
|
|
return get<detail::remove_cvref_t<T>>(v);
|
|
}
|
|
catch(...)
|
|
{
|
|
return detail::remove_cvref_t<T>(std::forward<T>(opt));
|
|
}
|
|
}
|
|
|
|
// ===========================================================================
|
|
// find_or(value, key, fallback)
|
|
|
|
template<typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
basic_value<C, M, V> const&
|
|
find_or(const basic_value<C, M, V>& v, const key& ky,
|
|
const basic_value<C, M, V>& opt)
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
const auto& tab = v.as_table();
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return tab.at(ky);
|
|
}
|
|
|
|
template<typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
basic_value<C, M, V>&
|
|
find_or(basic_value<C, M, V>& v, const toml::key& ky, basic_value<C, M, V>& opt)
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
auto& tab = v.as_table();
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return tab.at(ky);
|
|
}
|
|
|
|
template<typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
basic_value<C, M, V>
|
|
find_or(basic_value<C, M, V>&& v, const toml::key& ky, basic_value<C, M, V>&& opt)
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
auto tab = std::move(v).as_table();
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return basic_value<C, M, V>(std::move(tab.at(ky)));
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// exact types (return type can be a reference)
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<
|
|
detail::is_exact_toml_type<T, basic_value<C, M, V>>::value, T> const&
|
|
find_or(const basic_value<C, M, V>& v, const key& ky, const T& opt)
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
const auto& tab = v.as_table();
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(tab.at(ky), opt);
|
|
}
|
|
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<
|
|
detail::is_exact_toml_type<T, basic_value<C, M, V>>::value, T>&
|
|
find_or(basic_value<C, M, V>& v, const toml::key& ky, T& opt)
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
auto& tab = v.as_table();
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(tab.at(ky), opt);
|
|
}
|
|
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<
|
|
detail::is_exact_toml_type<T, basic_value<C, M, V>>::value,
|
|
detail::remove_cvref_t<T>>
|
|
find_or(basic_value<C, M, V>&& v, const toml::key& ky, T&& opt)
|
|
{
|
|
if(!v.is_table()) {return std::forward<T>(opt);}
|
|
auto tab = std::move(v).as_table();
|
|
if(tab.count(ky) == 0) {return std::forward<T>(opt);}
|
|
return get_or(std::move(tab.at(ky)), std::forward<T>(opt));
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// std::string (return type can be a reference)
|
|
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<std::is_same<T, std::string>::value, std::string> const&
|
|
find_or(const basic_value<C, M, V>& v, const key& ky, const T& opt)
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
const auto& tab = v.as_table();
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(tab.at(ky), opt);
|
|
}
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<std::is_same<T, std::string>::value, std::string>&
|
|
find_or(basic_value<C, M, V>& v, const toml::key& ky, T& opt)
|
|
{
|
|
if(!v.is_table()) {return opt;}
|
|
auto& tab = v.as_table();
|
|
if(tab.count(ky) == 0) {return opt;}
|
|
return get_or(tab.at(ky), opt);
|
|
}
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<std::is_same<T, std::string>::value, std::string>
|
|
find_or(basic_value<C, M, V>&& v, const toml::key& ky, T&& opt)
|
|
{
|
|
if(!v.is_table()) {return std::forward<T>(opt);}
|
|
auto tab = std::move(v).as_table();
|
|
if(tab.count(ky) == 0) {return std::forward<T>(opt);}
|
|
return get_or(std::move(tab.at(ky)), std::forward<T>(opt));
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// string literal (deduced as std::string)
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<
|
|
detail::is_string_literal<typename std::remove_reference<T>::type>::value,
|
|
std::string>
|
|
find_or(const basic_value<C, M, V>& v, const toml::key& ky, T&& opt)
|
|
{
|
|
if(!v.is_table()) {return std::string(opt);}
|
|
const auto& tab = v.as_table();
|
|
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 C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
detail::enable_if_t<detail::conjunction<
|
|
// T is not an exact toml type
|
|
detail::negation<detail::is_exact_toml_type<
|
|
detail::remove_cvref_t<T>, basic_value<C, M, V>>>,
|
|
// T is not std::string
|
|
detail::negation<std::is_same<std::string, detail::remove_cvref_t<T>>>,
|
|
// T is not a string literal
|
|
detail::negation<detail::is_string_literal<
|
|
typename std::remove_reference<T>::type>>
|
|
>::value, detail::remove_cvref_t<T>>
|
|
find_or(const basic_value<C, M, V>& v, const toml::key& ky, T&& opt)
|
|
{
|
|
if(!v.is_table()) {return std::forward<T>(opt);}
|
|
const auto& tab = v.as_table();
|
|
if(tab.count(ky) == 0) {return std::forward<T>(opt);}
|
|
return get_or(tab.at(ky), std::forward<T>(opt));
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// recursive find-or with type deduction (find_or(value, keys, opt))
|
|
|
|
template<typename Value, typename ... Ks,
|
|
typename detail::enable_if_t<(sizeof...(Ks) > 1), std::nullptr_t> = nullptr>
|
|
// here we need to add SFINAE in the template parameter to avoid
|
|
// infinite recursion in type deduction on gcc
|
|
auto find_or(Value&& v, const toml::key& ky, Ks&& ... keys)
|
|
-> decltype(find_or(std::forward<Value>(v), ky, detail::last_one(std::forward<Ks>(keys)...)))
|
|
{
|
|
if(!v.is_table())
|
|
{
|
|
return detail::last_one(std::forward<Ks>(keys)...);
|
|
}
|
|
auto&& tab = std::forward<Value>(v).as_table();
|
|
if(tab.count(ky) == 0)
|
|
{
|
|
return detail::last_one(std::forward<Ks>(keys)...);
|
|
}
|
|
return find_or(std::forward<decltype(tab)>(tab).at(ky), std::forward<Ks>(keys)...);
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// recursive find_or with explicit type specialization, find_or<int>(value, keys...)
|
|
|
|
template<typename T, typename Value, typename ... Ks,
|
|
typename detail::enable_if_t<(sizeof...(Ks) > 1), std::nullptr_t> = nullptr>
|
|
// here we need to add SFINAE in the template parameter to avoid
|
|
// infinite recursion in type deduction on gcc
|
|
auto find_or(Value&& v, const toml::key& ky, Ks&& ... keys)
|
|
-> decltype(find_or<T>(std::forward<Value>(v), ky, detail::last_one(std::forward<Ks>(keys)...)))
|
|
{
|
|
if(!v.is_table())
|
|
{
|
|
return detail::last_one(std::forward<Ks>(keys)...);
|
|
}
|
|
auto&& tab = std::forward<Value>(v).as_table();
|
|
if(tab.count(ky) == 0)
|
|
{
|
|
return detail::last_one(std::forward<Ks>(keys)...);
|
|
}
|
|
return find_or(std::forward<decltype(tab)>(tab).at(ky), std::forward<Ks>(keys)...);
|
|
}
|
|
|
|
// ============================================================================
|
|
// expect
|
|
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
result<T, std::string> expect(const basic_value<C, M, V>& v) noexcept
|
|
{
|
|
try
|
|
{
|
|
return ok(get<T>(v));
|
|
}
|
|
catch(const std::exception& e)
|
|
{
|
|
return err(e.what());
|
|
}
|
|
}
|
|
template<typename T, typename C,
|
|
template<typename ...> class M, template<typename ...> class V>
|
|
result<T, std::string>
|
|
expect(const basic_value<C, M, V>& v, const toml::key& k) noexcept
|
|
{
|
|
try
|
|
{
|
|
return ok(find<T>(v, k));
|
|
}
|
|
catch(const std::exception& e)
|
|
{
|
|
return err(e.what());
|
|
}
|
|
}
|
|
|
|
} // toml
|
|
#endif// TOML11_GET
|