#ifndef FESA_CORE_ASCII_H_
#define FESA_CORE_ASCII_H_

#include <cstdint>
#include <string_view>

#include "fesa/core/status.h"

namespace fesa {

/// @brief Converts one ASCII uppercase byte to lowercase.
/// @return The lowercase ASCII byte, or the input byte when it is not A-Z.
char AsciiLower(char value) noexcept;

/// @brief Compares two byte strings with ASCII-only case folding.
/// @return True when the strings have equal length and equal ASCII-folded
/// bytes.
bool AsciiCaseInsensitiveEquals(std::string_view lhs,
                                std::string_view rhs) noexcept;

/// @brief Parses a complete positive base-10 source label.
/// @return The positive label or an input failure for malformed, nonpositive,
/// or out-of-range text.
Result<std::int64_t> ParsePositiveSourceLabel(std::string_view text);

}  // namespace fesa

#endif  // FESA_CORE_ASCII_H_