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#pragma once
#include <cstddef>
#include <optional>
#include <string>
#include <utility>
#include <openvic-dataloader/detail/Concepts.hpp>
#include <lexy/encoding.hpp>
#include <lexy/input/buffer.hpp>
#include <lexy/input/file.hpp>
#include "openvic-dataloader/detail/Encoding.hpp"
#include "openvic-dataloader/detail/Utility.hpp"
#include "detail/BufferError.hpp"
#include "detail/Detect.hpp"
#include "detail/InternalConcepts.hpp"
namespace ovdl::detail {
struct ParseHandler {
std::string make_error_from(buffer_error error) const {
switch (error) {
using enum ovdl::detail::buffer_error;
case buffer_is_null:
return "Buffer could not be loaded.";
case os_error:
return "OS file error for '{}'.";
case file_not_found:
return "File '{}' not found.";
case permission_denied:
return "Read Permission for '{}' denied.";
default:
return "";
}
}
constexpr bool is_valid() const {
return is_valid_impl();
}
buffer_error load_buffer_size(const char* data, std::size_t size, std::optional<Encoding> fallback) {
lexy::buffer<lexy::default_encoding> buffer(data, size);
if (buffer.data() == nullptr) return buffer_error::buffer_is_null;
return load_buffer_impl(std::move(buffer), "", fallback);
}
buffer_error load_buffer(const char* start, const char* end, std::optional<Encoding> fallback) {
lexy::buffer<lexy::default_encoding> buffer(start, end);
if (buffer.data() == nullptr) return buffer_error::buffer_is_null;
return load_buffer_impl(std::move(buffer), "", fallback);
}
buffer_error load_file(const char* path, std::optional<Encoding> fallback) {
lexy::read_file_result file = lexy::read_file<lexy::default_encoding, lexy::encoding_endianness::bom>(path);
if (!file) {
return ovdl::detail::from_underlying<buffer_error>(ovdl::detail::to_underlying(file.error()));
}
return load_buffer_impl(std::move(file).buffer(), path, fallback);
}
const char* path() const {
return path_impl();
}
static Encoding get_system_fallback() {
return _system_fallback_encoding.value_or(Encoding::Unknown);
}
virtual ~ParseHandler() = default;
protected:
constexpr virtual bool is_valid_impl() const = 0;
constexpr virtual buffer_error load_buffer_impl(lexy::buffer<lexy::default_encoding>&& buffer, const char* path = "", std::optional<Encoding> fallback = std::nullopt) = 0;
virtual const char* path_impl() const = 0;
template<detail::IsStateType State, detail::IsEncoding BufferEncoding>
static constexpr auto generate_state = [](State* state, const char* path, auto&& buffer, Encoding encoding) {
if (path[0] != '\0') {
*state = {
path,
lexy::buffer<BufferEncoding>(std::move(buffer)),
encoding
};
return;
}
*state = { lexy::buffer<BufferEncoding>(std::move(buffer)), encoding };
};
template<detail::IsStateType State>
static void create_state(State* state, const char* path, lexy::buffer<lexy::default_encoding>&& buffer, std::optional<Encoding> fallback) {
if (!_system_fallback_encoding.has_value()) {
_detect_system_fallback_encoding();
}
bool is_bad_fallback = false;
if (fallback.has_value()) {
is_bad_fallback = fallback.value() == Encoding::Ascii || fallback.value() == Encoding::Utf8;
if (is_bad_fallback)
fallback = _system_fallback_encoding.value();
} else {
fallback = _system_fallback_encoding.value();
}
auto [encoding, is_alone] = encoding_detect::Detector { .default_fallback = fallback.value() }.detect_assess(buffer);
switch (encoding) {
using enum Encoding;
case Ascii:
case Utf8: {
generate_state<State, lexy::utf8_char_encoding>(state, path, std::move(buffer), encoding);
break;
}
case Unknown:
case Windows1251:
case Windows1252: {
generate_state<State, lexy::default_encoding>(state, path, std::move(buffer), encoding);
break;
}
default:
ovdl::detail::unreachable();
}
if (!is_alone) {
state->logger().info("encoding type could not be distinguished");
}
if (is_bad_fallback) {
state->logger().warning("fallback encoding cannot be ascii or utf8");
}
if (encoding == ovdl::detail::Encoding::Unknown) {
state->logger().warning("could not detect encoding");
}
}
private:
inline static std::optional<Encoding> _system_fallback_encoding = std::nullopt;
static void _detect_system_fallback_encoding();
};
template<detail::IsFileParseState ParseState>
struct BasicFileParseHandler : ParseHandler {
using parse_state_type = ParseState;
virtual constexpr bool is_valid_impl() const {
return _parse_state.file().is_valid();
}
constexpr virtual buffer_error load_buffer_impl(lexy::buffer<lexy::default_encoding>&& buffer, const char* path, std::optional<Encoding> fallback) {
if (buffer.data() == nullptr) {
_parse_state = {};
return buffer_error::buffer_is_null;
}
create_state(&_parse_state, path, std::move(buffer), fallback);
return is_valid_impl() ? buffer_error::success : buffer_error::buffer_is_null;
}
virtual const char* path_impl() const {
return _parse_state.file().path();
}
parse_state_type& parse_state() {
return _parse_state;
}
const parse_state_type& parse_state() const {
return _parse_state;
}
template<typename Encoding>
constexpr const auto& buffer() const {
return _parse_state.file().template get_buffer_as<Encoding>();
}
protected:
parse_state_type _parse_state;
};
template<detail::IsParseState ParseState>
struct BasicStateParseHandler : ParseHandler {
using parse_state_type = ParseState;
virtual constexpr bool is_valid_impl() const {
return _parse_state.ast().file().is_valid();
}
constexpr virtual buffer_error load_buffer_impl(lexy::buffer<lexy::default_encoding>&& buffer, const char* path, std::optional<Encoding> fallback) {
if (buffer.data() == nullptr) return buffer_error::buffer_is_null;
create_state(&_parse_state, path, std::move(buffer), fallback);
return is_valid_impl() ? buffer_error::success : buffer_error::buffer_is_null;
}
virtual const char* path_impl() const {
return _parse_state.ast().file().path();
}
parse_state_type& parse_state() {
return _parse_state;
}
const parse_state_type& parse_state() const {
return _parse_state;
}
template<typename Encoding>
constexpr const auto& buffer() const {
return _parse_state.ast().file().template get_buffer_as<Encoding>();
}
protected:
parse_state_type _parse_state;
};
}
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zaaarf