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#ifndef LINE_HH
#define LINE_HH
#include "io.hh" // IWYU pragma: export
#include <cstddef>
#include <expected>
#include <memory>
#include <optional>
#include <string_view>
namespace line {
struct ReadError {
bool eof;
std::optional<io::ReadError> io_error;
ReadError();
explicit ReadError(io::ReadError error);
};
class Reader {
public:
virtual ~Reader() = default;
// Returned view is only valid until next call to read.
[[nodiscard]] virtual std::expected<std::string_view, ReadError> read() = 0;
// Starts at zero. Returns next line.
// So, before first read it is zero, after first read it is one.
[[nodiscard]] virtual uint64_t number() const = 0;
protected:
Reader() = default;
Reader(Reader const&) = delete;
Reader& operator=(Reader const&) = delete;
};
[[nodiscard]] std::unique_ptr<Reader> open(std::unique_ptr<io::Reader> reader,
size_t max_len = 8192);
} // namespace line
#endif // LINE_HH
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