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#pragma once
#include <cassert>
#include <concepts> // IWYU pragma: keep
#include <type_traits>
#include <variant>
#include <openvic-dataloader/NodeLocation.hpp>
#include <openvic-dataloader/detail/Utility.hpp>
#include <lexy/encoding.hpp>
#include <lexy/input/buffer.hpp>
#include <dryad/node_map.hpp>
namespace ovdl {
struct File {
using buffer_ids = detail::TypeRegister<
lexy::buffer<lexy::default_encoding, void>,
lexy::buffer<lexy::utf8_char_encoding, void>,
lexy::buffer<lexy::utf8_encoding, void>,
lexy::buffer<lexy::utf16_encoding, void>,
lexy::buffer<lexy::utf32_encoding, void>,
lexy::buffer<lexy::byte_encoding, void>>;
explicit File(const char* path);
const char* path() const noexcept;
bool is_valid() const noexcept;
std::size_t size() const noexcept;
template<typename Encoding, typename MemoryResource = void>
constexpr bool is_buffer() const {
return buffer_ids::type_id<lexy::buffer<Encoding, MemoryResource>>() + 1 == _buffer.index();
}
template<typename Encoding, typename MemoryResource = void>
lexy::buffer<Encoding, MemoryResource>* try_get_buffer_as() {
return std::get_if<lexy::buffer<Encoding, MemoryResource>>(&_buffer);
}
template<typename Encoding, typename MemoryResource = void>
const lexy::buffer<Encoding, MemoryResource>* try_get_buffer_as() const {
return std::get_if<lexy::buffer<Encoding, MemoryResource>>(&_buffer);
}
template<typename Encoding, typename MemoryResource = void>
lexy::buffer<Encoding, MemoryResource>& get_buffer_as() {
assert((is_buffer<Encoding, MemoryResource>()));
return *std::get_if<lexy::buffer<Encoding, MemoryResource>>(&_buffer);
}
template<typename Encoding, typename MemoryResource = void>
const lexy::buffer<Encoding, MemoryResource>& get_buffer_as() const {
assert((is_buffer<Encoding, MemoryResource>()));
return *std::get_if<lexy::buffer<Encoding, MemoryResource>>(&_buffer);
}
#define SWITCH_LIST \
X(1) \
X(2) \
X(3) \
X(4) \
X(5) \
X(6)
#define X(NUM) \
case NUM: \
return visitor(std::get<NUM>(_buffer));
template<typename Visitor>
decltype(auto) visit_buffer(Visitor&& visitor) {
switch (_buffer.index()) {
SWITCH_LIST
default: ovdl::detail::unreachable();
}
}
template<typename Return, typename Visitor>
Return visit_buffer(Visitor&& visitor) {
switch (_buffer.index()) {
SWITCH_LIST
default: ovdl::detail::unreachable();
}
}
template<typename Visitor>
decltype(auto) visit_buffer(Visitor&& visitor) const {
switch (_buffer.index()) {
SWITCH_LIST
default: ovdl::detail::unreachable();
}
}
template<typename Return, typename Visitor>
Return visit_buffer(Visitor&& visitor) const {
switch (_buffer.index()) {
SWITCH_LIST
default: ovdl::detail::unreachable();
}
}
#undef X
#undef SWITCH_LIST
protected:
const char* _path;
std::size_t _buffer_size = 0;
detail::type_prepend_t<buffer_ids::variant_type, std::monostate> _buffer;
};
template<typename NodeT>
struct BasicFile : File {
using node_type = NodeT;
template<typename Encoding, typename MemoryResource = void>
explicit BasicFile(const char* path, lexy::buffer<Encoding, MemoryResource>&& buffer)
: File(path) {
_buffer_size = buffer.size();
_buffer = static_cast<std::remove_reference_t<decltype(buffer)>&&>(buffer);
}
template<typename Encoding, typename MemoryResource = void>
explicit BasicFile(lexy::buffer<Encoding, MemoryResource>&& buffer)
: File("") {
_buffer_size = buffer.size();
_buffer = static_cast<std::remove_reference_t<decltype(buffer)>&&>(buffer);
}
void set_location(const node_type* n, NodeLocation loc) {
_map.insert(n, loc);
}
NodeLocation location_of(const node_type* n) const {
auto result = _map.lookup(n);
DRYAD_ASSERT(result != nullptr, "every Node should have a NodeLocation");
return *result;
}
protected:
dryad::node_map<const node_type, NodeLocation> _map;
};
}
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