// ArduinoJson - https://arduinojson.org

// Copyright © 2014-2025, Benoit BLANCHON

// MIT License

#pragma once

#include <ArduinoJson/Namespace.hpp>

#include <stdint.h>  // uint16_t, uint32_t

// The high surrogate may be uninitialized if the pair is invalid,

// we choose to ignore the problem to reduce the size of the code

// Garbage in => Garbage out

#if defined(__GNUC__)

#  if __GNUC__ >= 7

#    pragma GCC diagnostic push

#    pragma GCC diagnostic ignored "-Wmaybe-uninitialized"

#  endif

#endif

ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE

namespace Utf16 {

inline bool isHighSurrogate(uint16_t codeunit) {

  return codeunit >= 0xD800 && codeunit < 0xDC00;

}

inline bool isLowSurrogate(uint16_t codeunit) {

  return codeunit >= 0xDC00 && codeunit < 0xE000;

}

class Codepoint {

 public:

  Codepoint() : highSurrogate_(0), codepoint_(0) {}

  bool append(uint16_t codeunit) {

    if (isHighSurrogate(codeunit)) {

      highSurrogate_ = codeunit & 0x3FF;

      return false;

    }

    if (isLowSurrogate(codeunit)) {

      codepoint_ =

          uint32_t(0x10000 + ((highSurrogate_ << 10) | (codeunit & 0x3FF)));

      return true;

    }

    codepoint_ = codeunit;

    return true;

  }

  uint32_t value() const {

    return codepoint_;

  }

 private:

  uint16_t highSurrogate_;

  uint32_t codepoint_;

};

}  // namespace Utf16

ARDUINOJSON_END_PRIVATE_NAMESPACE

#if defined(__GNUC__)

#  if __GNUC__ >= 8

#    pragma GCC diagnostic pop

#  endif

#endif