Function lastCodepoint

lib/Epub/Epub/ParsedText.cpp:48–57

Returns the last codepoint of a word by scanning backward for the start of the last UTF-8 sequence.

// Returns the last codepoint of a word by scanning backward for the start of the last UTF-8 sequence.
uint32_t lastCodepoint(const std::string& word) {
  if (word.empty()) return 0;
  // UTF-8 continuation bytes start with 10xxxxxx; scan backward to find the leading byte.
  size_t i = word.size() - 1;
  while (i > 0 && (static_cast<uint8_t>(word[i]) & 0xC0) == 0x80) {
    --i;
  }
  const auto* ptr = reinterpret_cast<const unsigned char*>(word.c_str() + i);
  return utf8NextCodepoint(&ptr);
}

bool containsSoftHyphen(const std::string& word) { return word.find(SOFT_HYPHEN_UTF8) != std::string::npos; }