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toml11/toml/get.hpp

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// Copyright Toru Niina 2017.
// Distributed under the MIT License.
#ifndef TOML11_GET_HPP
#define TOML11_GET_HPP
#include "from.hpp"
#include "result.hpp"
#include "value.hpp"
#include <algorithm>
namespace toml
{
// ============================================================================
// exact toml::* type
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(basic_value<C, M, V>& v)
{
return v.template cast<detail::type_to_enum<T, basic_value<C, M, V>>::value>();
}
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(const basic_value<C, M, V>& v)
{
return v.template cast<detail::type_to_enum<T, basic_value<C, M, V>>::value>();
}
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(basic_value<C, M, V>&& v)
{
return T(std::move(v).template cast<detail::type_to_enum<T, basic_value<C, M, V>>::value>());
}
// ============================================================================
// T == toml::value; identity transformation.
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
inline detail::enable_if_t<std::is_same<T, basic_value<C, M, V>>::value, T>&
get(basic_value<C, M, V>& v)
{
return v;
}
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
inline detail::enable_if_t<std::is_same<T, basic_value<C, M, V>>::value, T> const&
get(const basic_value<C, M, V>& v)
{
return v;
}
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
inline detail::enable_if_t<std::is_same<T, basic_value<C, M, V>>::value, T>
get(basic_value<C, M, V>&& v)
{
return basic_value<C, M, V>(std::move(v));
}
// ============================================================================
// T == toml::basic_value<C2, M2, V2>; basic_value -> basic_value
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
inline detail::enable_if_t<detail::conjunction<detail::is_basic_value<T>,
detail::negation<std::is_same<T, basic_value<C, M, V>>>
>::value, T>
get(const basic_value<C, M, V>& v)
{
return T(v);
}
// ============================================================================
// integer convertible from toml::Integer
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
inline detail::enable_if_t<detail::conjunction<
std::is_integral<T>, // T is integral
detail::negation<std::is_same<T, bool>>, // but not bool
detail::negation< // but not toml::integer
detail::is_exact_toml_type<T, basic_value<C, M, V>>>
>::value, T>
get(const basic_value<C, M, V>& v)
{
return static_cast<T>(v.as_integer());
}
// ============================================================================
// floating point convertible from toml::Float
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
inline detail::enable_if_t<detail::conjunction<
std::is_floating_point<T>, // T is floating_point
detail::negation< // but not toml::floating
detail::is_exact_toml_type<T, basic_value<C, M, V>>>
>::value, T>
get(const basic_value<C, M, V>& v)
{
return static_cast<T>(v.as_floating());
}
// ============================================================================
// std::string; toml uses its own toml::string, but it should be convertible to
// std::string seamlessly
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
inline detail::enable_if_t<std::is_same<T, std::string>::value, std::string>&
get(basic_value<C, M, V>& v)
{
return v.as_string().str;
}
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
inline detail::enable_if_t<std::is_same<T, std::string>::value, std::string> const&
get(const basic_value<C, M, V>& v)
{
return v.as_string().str;
}
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
inline detail::enable_if_t<std::is_same<T, std::string>::value, std::string>
get(basic_value<C, M, V>&& v)
{
return std::string(std::move(v.as_string().str));
}
// ============================================================================
// std::string_view
#if __cplusplus >= 201703L
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
inline detail::enable_if_t<std::is_same<T, std::string_view>::value, std::string_view>
get(const basic_value<C, M, V>& v)
{
return std::string_view(v.as_string().str);
}
#endif
// ============================================================================
// std::chrono::duration from toml::local_time.
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
inline detail::enable_if_t<detail::is_chrono_duration<T>::value, T>
get(const basic_value<C, M, V>& v)
{
return std::chrono::duration_cast<T>(
std::chrono::nanoseconds(v.as_local_time()));
}
// ============================================================================
// std::chrono::system_clock::time_point from toml::datetime variants
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
inline detail::enable_if_t<
std::is_same<std::chrono::system_clock::time_point, T>::value, T>
get(const basic_value<C, M, V>& v)
{
switch(v.type())
{
case value_t::local_date:
{
return std::chrono::system_clock::time_point(v.as_local_date());
}
case value_t::local_datetime:
{
return std::chrono::system_clock::time_point(v.as_local_datetime());
}
case value_t::offset_datetime:
{
return std::chrono::system_clock::time_point(v.as_offset_datetime());
}
default:
{
throw type_error(detail::format_underline("toml::value: "
"bad_cast to std::chrono::system_clock::time_point", {
{std::addressof(detail::get_region(v)),
concat_to_string("the actual type is ", v.type())}
}), v.location());
}
}
}
// ============================================================================
// forward declaration to use this recursively. ignore this and go ahead.
// array-like type with resize(N) method
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::conjunction<
detail::is_container<T>, // T is container
detail::has_resize_method<T>, // T::resize(N) works
detail::negation< // but not toml::array
detail::is_exact_toml_type<T, basic_value<C, M, V>>>
>::value, T>
get(const basic_value<C, M, V>&);
// array-like type with resize(N) method
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::conjunction<
detail::is_container<T>, // T is container
detail::negation<detail::has_resize_method<T>>, // no T::resize() exists
detail::negation< // not toml::array
detail::is_exact_toml_type<T, basic_value<C, M, V>>>
>::value, T>
get(const basic_value<C, M, V>&);
// std::pair<T1, T2>
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::is_std_pair<T>::value, T>
get(const basic_value<C, M, V>&);
// std::tuple<T1, T2, ...>
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::is_std_tuple<T>::value, T>
get(const basic_value<C, M, V>&);
// map-like classes
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::conjunction<
detail::is_map<T>, // T is map
detail::negation< // but not toml::table
detail::is_exact_toml_type<T, basic_value<C, M, V>>>
>::value, T>
get(const basic_value<C, M, V>&);
// T.from_toml(v)
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::conjunction<
detail::negation< // not a toml::* type
detail::is_exact_toml_type<T, basic_value<C, M, V>>>,
detail::has_from_toml_method<T, C, M, V>, // but has from_toml(toml::value)
std::is_default_constructible<T> // and default constructible
>::value, T>
get(const basic_value<C, M, V>&);
// toml::from<T>::from_toml(v)
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V,
std::size_t S = sizeof(::toml::from<T>)>
T get(const basic_value<C, M, V>&);
// T(const toml::value&) and T is not toml::basic_value
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::conjunction<
detail::negation<detail::is_basic_value<T>>,
std::is_constructible<T, const basic_value<C, M, V>&>
>::value, T>
get(const basic_value<C, M, V>&);
// ============================================================================
// array-like types; most likely STL container, like std::vector, etc.
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::conjunction<
detail::is_container<T>, // T is container
detail::has_resize_method<T>, // T::resize(N) works
detail::negation< // but not toml::array
detail::is_exact_toml_type<T, basic_value<C, M, V>>>
>::value, T>
get(const basic_value<C, M, V>& v)
{
using value_type = typename T::value_type;
const auto& ar = v.as_array();
T container;
container.resize(ar.size());
std::transform(ar.cbegin(), ar.cend(), container.begin(),
[](const value& x){return ::toml::get<value_type>(x);});
return container;
}
// ============================================================================
// array-like types; but does not have resize(); most likely std::array.
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::conjunction<
detail::is_container<T>, // T is container
detail::negation<detail::has_resize_method<T>>, // no T::resize() exists
detail::negation< // but not toml::array
detail::is_exact_toml_type<T, basic_value<C, M, V>>>
>::value, T>
get(const basic_value<C, M, V>& v)
{
using value_type = typename T::value_type;
const auto& ar = v.as_array();
T container;
if(ar.size() != container.size())
{
throw std::out_of_range(detail::format_underline(concat_to_string(
"toml::get: specified container size is ", container.size(),
" but there are ", ar.size(), " elements in toml array."), {
{std::addressof(detail::get_region(v)), "here"}
}));
}
std::transform(ar.cbegin(), ar.cend(), container.begin(),
[](const value& x){return ::toml::get<value_type>(x);});
return container;
}
// ============================================================================
// std::pair.
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::is_std_pair<T>::value, T>
get(const basic_value<C, M, V>& v)
{
using first_type = typename T::first_type;
using second_type = typename T::second_type;
const auto& ar = v.as_array();
if(ar.size() != 2)
{
throw std::out_of_range(detail::format_underline(concat_to_string(
"toml::get: specified std::pair but there are ", ar.size(),
" elements in toml array."), {
{std::addressof(detail::get_region(v)), "here"}
}));
}
return std::make_pair(::toml::get<first_type >(ar.at(0)),
::toml::get<second_type>(ar.at(1)));
}
// ============================================================================
// std::tuple.
namespace detail
{
template<typename T, typename Array, std::size_t ... I>
T get_tuple_impl(const Array& a, index_sequence<I...>)
{
return std::make_tuple(
::toml::get<typename std::tuple_element<I, T>::type>(a.at(I))...);
}
} // detail
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::is_std_tuple<T>::value, T>
get(const basic_value<C, M, V>& v)
{
const auto& ar = v.as_array();
if(ar.size() != std::tuple_size<T>::value)
{
throw std::out_of_range(detail::format_underline(concat_to_string(
"toml::get: specified std::tuple with ",
std::tuple_size<T>::value, " elements, but there are ", ar.size(),
" elements in toml array."), {
{std::addressof(detail::get_region(v)), "here"}
}));
}
return detail::get_tuple_impl<T>(ar,
detail::make_index_sequence<std::tuple_size<T>::value>{});
}
// ============================================================================
// map-like types; most likely STL map, like std::map or std::unordered_map.
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::conjunction<
detail::is_map<T>, // T is map
detail::negation< // but not toml::array
detail::is_exact_toml_type<T, basic_value<C, M, V>>>
>::value, T>
get(const basic_value<C, M, V>& v)
{
using key_type = typename T::key_type;
using mapped_type = typename T::mapped_type;
static_assert(std::is_convertible<std::string, key_type>::value,
"toml::get only supports map type of which key_type is "
"convertible from std::string.");
T map;
for(const auto& kv : v.as_table())
{
map[key_type(kv.first)] = ::toml::get<mapped_type>(kv.second);
}
return map;
}
// ============================================================================
// user-defined, but compatible types.
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::conjunction<
detail::negation< // not a toml::* type
detail::is_exact_toml_type<T, basic_value<C, M, V>>>,
detail::has_from_toml_method<T, C, M, V>, // but has from_toml(toml::value) memfn
std::is_default_constructible<T> // and default constructible
>::value, T>
get(const basic_value<C, M, V>& v)
{
T ud;
ud.from_toml(v);
return ud;
}
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V,
std::size_t>
T get(const basic_value<C, M, V>& v)
{
return ::toml::from<T>::from_toml(v);
}
template<typename T, typename C,
template<typename ...> class M, template<typename ...> class V>
detail::enable_if_t<detail::conjunction<
detail::negation<detail::is_basic_value<T>>,
std::is_constructible<T, const basic_value<C, M, V>&>
>::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"), {
{std::addressof(detail::get_region(v)), "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"), {
{std::addressof(detail::get_region(v)), "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"), {
{std::addressof(detail::get_region(v)), "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"), {
{std::addressof(detail::get_region(v)), "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"), {
{std::addressof(detail::get_region(v)), "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"), {
{std::addressof(detail::get_region(v)), "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));
}
// ============================================================================
// 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
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