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#ifndef RFL_PARSING_PARSER_SPAN_HPP_
#define RFL_PARSING_PARSER_SPAN_HPP_
#include <cstring>
#include <map>
#include <span>
#include <string>
#include <type_traits>
#include <vector>
#include "../Result.hpp"
#include "../always_false.hpp"
#include "Parent.hpp"
#include "Parser_base.hpp"
#include "schema/Type.hpp"
namespace rfl::parsing {
template <class R, class W, class T, class ProcessorsType>
requires AreReaderAndWriter<R, W, std::span<T>>
struct Parser<R, W, std::span<T>, ProcessorsType> {
using InputVarType = typename R::InputVarType;
using ParentType = Parent<W>;
static Result<std::span<T>> read(const R& _r,
const InputVarType& _var) noexcept {
if constexpr (!ProcessorsType::allow_raw_ptrs_) {
static_assert(
always_false_v<R>,
"Reading into std::span is dangerous and "
"therefore unsupported. "
"Please consider using std::vector instead or wrapping "
"std::vector in rfl::Box or rfl::Ref."
"If you absolutely must use std::span, "
"you can pass the rfl::AllowRawPtrs processor. "
"Please note that it is then YOUR responsibility "
"to delete the allocated memory. Please also refer "
"to the related documentation (in the section on processors).");
return error("Unsupported.");
} else {
return Parser<R, W, std::vector<std::remove_cvref_t<T>>,
ProcessorsType>::read(_r, _var)
.and_then([](std::vector<T>&& _vec) -> Result<std::span<T>> {
using Type = std::remove_cvref_t<T>;
Type* data = new (std::nothrow) Type[_vec.size()];
if (!data) {
return error("Failed to allocate memory for std::span.");
}
for (size_t i = 0; i < _vec.size(); ++i) {
data[i] = std::move(_vec[i]);
}
return std::span<T>(data, data + _vec.size());
});
}
}
template <class P>
static void write(const W& _w, const std::span<T>& _span,
const P& _parent) noexcept {
auto arr = ParentType::add_array(_w, _span.size(), _parent);
const auto new_parent = typename ParentType::Array{&arr};
for (const auto& v : _span) {
Parser<R, W, std::remove_cvref_t<T>, ProcessorsType>::write(_w, v,
new_parent);
}
_w.end_array(&arr);
}
static schema::Type to_schema(
std::map<std::string, schema::Type>* _definitions) {
return Parser<R, W, std::vector<std::remove_cvref_t<T>>,
ProcessorsType>::to_schema(_definitions);
}
};
} // namespace rfl::parsing
#endif
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