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#include <memory>
#include <vector>
#include <openvic-dataloader/csv/LineObject.hpp>
#include <openvic-dataloader/csv/Parser.hpp>
#include <openvic-dataloader/detail/ClassExport.hpp>
#include <lexy/action/parse.hpp>
#include <lexy/encoding.hpp>
#include <lexy/input/buffer.hpp>
#include <lexy/input/file.hpp>
#include "csv/CsvGrammar.hpp"
#include "detail/BasicBufferHandler.hpp"
#include "detail/Errors.hpp"
#include "detail/LexyReportError.hpp"
#include "detail/OStreamOutputIterator.hpp"
using namespace ovdl;
using namespace ovdl::csv;
/// BufferHandler ///
template<EncodingType>
struct LexyEncodingFrom {
};
template<>
struct LexyEncodingFrom<EncodingType::Windows1252> {
using encoding = lexy::default_encoding;
};
template<>
struct LexyEncodingFrom<EncodingType::Utf8> {
using encoding = lexy::utf8_char_encoding;
};
template<EncodingType Encoding>
class Parser<Encoding>::BufferHandler final : public detail::BasicBufferHandler<typename LexyEncodingFrom<Encoding>::encoding> {
public:
template<typename Node, typename ErrorCallback>
std::optional<std::vector<ParseError>> parse(const ErrorCallback& callback) {
auto result = lexy::parse<Node>(this->_buffer, callback);
if (!result) {
return result.errors();
}
_lines = std::move(result.value());
return std::nullopt;
}
std::vector<csv::LineObject>& get_lines() {
return _lines;
}
private:
std::vector<csv::LineObject> _lines;
};
/// BufferHandler ///
template<EncodingType Encoding>
Parser<Encoding>::Parser()
: _buffer_handler(std::make_unique<BufferHandler>()) {
set_error_log_to_stderr();
}
template<EncodingType Encoding>
Parser<Encoding>::Parser(Parser&&) = default;
template<EncodingType Encoding>
Parser<Encoding>& Parser<Encoding>::operator=(Parser&&) = default;
template<EncodingType Encoding>
Parser<Encoding>::~Parser() = default;
template<EncodingType Encoding>
Parser<Encoding> Parser<Encoding>::from_buffer(const char* data, std::size_t size) {
Parser result;
return std::move(result.load_from_buffer(data, size));
}
template<EncodingType Encoding>
Parser<Encoding> Parser<Encoding>::from_buffer(const char* start, const char* end) {
Parser result;
return std::move(result.load_from_buffer(start, end));
}
template<EncodingType Encoding>
Parser<Encoding> Parser<Encoding>::from_string(const std::string_view string) {
Parser result;
return std::move(result.load_from_string(string));
}
template<EncodingType Encoding>
Parser<Encoding> Parser<Encoding>::from_file(const char* path) {
Parser result;
return std::move(result.load_from_file(path));
}
template<EncodingType Encoding>
Parser<Encoding> Parser<Encoding>::from_file(const std::filesystem::path& path) {
Parser result;
return std::move(result.load_from_file(path));
}
///
/// @brief Executes a function on _buffer_handler that is expected to load a buffer
///
/// Expected Use:
/// @code {.cpp}
/// _run_load_func(std::mem_fn(&BufferHandler::<load_function>), <arguments>);
/// @endcode
///
/// @tparam Type
/// @tparam Args
/// @param func
/// @param args
///
template<EncodingType Encoding>
template<typename... Args>
constexpr void Parser<Encoding>::_run_load_func(detail::LoadCallback<BufferHandler, Args...> auto func, Args... args) {
_warnings.clear();
_errors.clear();
_has_fatal_error = false;
if (auto error = func(_buffer_handler.get(), std::forward<Args>(args)...); error) {
_has_fatal_error = error.value().type == ParseError::Type::Fatal;
_errors.push_back(error.value());
_error_stream.get() << "Error: " << _errors.back().message << '\n';
}
}
template<EncodingType Encoding>
constexpr Parser<Encoding>& Parser<Encoding>::load_from_buffer(const char* data, std::size_t size) {
_run_load_func(std::mem_fn(&BufferHandler::load_buffer_size), data, size);
return *this;
}
template<EncodingType Encoding>
constexpr Parser<Encoding>& Parser<Encoding>::load_from_buffer(const char* start, const char* end) {
_run_load_func(std::mem_fn(&BufferHandler::load_buffer), start, end);
return *this;
}
template<EncodingType Encoding>
constexpr Parser<Encoding>& Parser<Encoding>::load_from_string(const std::string_view string) {
return load_from_buffer(string.data(), string.size());
}
template<EncodingType Encoding>
constexpr Parser<Encoding>& Parser<Encoding>::load_from_file(const char* path) {
_file_path = path;
_run_load_func(std::mem_fn(&BufferHandler::load_file), path);
return *this;
}
template<EncodingType Encoding>
Parser<Encoding>& Parser<Encoding>::load_from_file(const std::filesystem::path& path) {
return load_from_file(path.string().c_str());
}
template<EncodingType Encoding>
bool Parser<Encoding>::parse_csv() {
if (!_buffer_handler->is_valid()) {
return false;
}
std::optional<std::vector<ParseError>> errors;
if constexpr (Encoding == EncodingType::Windows1252) {
errors = _buffer_handler->template parse<csv::grammar::windows1252::SemiColonFile>(ovdl::detail::ReporError.path(_file_path).to(detail::OStreamOutputIterator { _error_stream }));
} else {
errors = _buffer_handler->template parse<csv::grammar::utf8::SemiColonFile>(ovdl::detail::ReporError.path(_file_path).to(detail::OStreamOutputIterator { _error_stream }));
}
if (errors) {
_errors.reserve(errors->size());
for (auto& err : errors.value()) {
_has_fatal_error |= err.type == ParseError::Type::Fatal;
_errors.push_back(err);
}
return false;
}
_lines = std::move(_buffer_handler->get_lines());
return true;
}
template<EncodingType Encoding>
const std::vector<csv::LineObject>& Parser<Encoding>::get_lines() const {
return _lines;
}
template class ovdl::csv::Parser<EncodingType::Windows1252>;
template class ovdl::csv::Parser<EncodingType::Utf8>;
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