public static String nativeSql()

in src/main/java/org/mariadb/jdbc/internal/util/Utils.java [477:584]
99 lines of code
37 McCabe index (conditional complexity)

  public static String nativeSql(String sql, Protocol protocol) throws SQLException {
    if (!sql.contains("{")) {
      return sql;
    }

    StringBuilder escapeSequenceBuf = new StringBuilder();
    StringBuilder sqlBuffer = new StringBuilder();

    char[] charArray = sql.toCharArray();
    char lastChar = 0;
    boolean inQuote = false;
    char quoteChar = 0;
    boolean inComment = false;
    boolean isSlashSlashComment = false;
    int inEscapeSeq = 0;

    for (int i = 0; i < charArray.length; i++) {
      char car = charArray[i];
      if (lastChar == '\\' && !protocol.noBackslashEscapes()) {
        sqlBuffer.append(car);
        // avoid considering escaped backslash as a futur escape character
        lastChar = ' ';
        continue;
      }

      switch (car) {
        case '\'':
        case '"':
        case '`':
          if (!inComment) {
            if (inQuote) {
              if (quoteChar == car) {
                inQuote = false;
              }
            } else {
              inQuote = true;
              quoteChar = car;
            }
          }
          break;

        case '*':
          if (!inQuote && !inComment && lastChar == '/') {
            inComment = true;
            isSlashSlashComment = false;
          }
          break;
        case '/':
        case '-':
          if (!inQuote) {
            if (inComment) {
              if (lastChar == '*' && !isSlashSlashComment) {
                inComment = false;
              } else if (lastChar == car && isSlashSlashComment) {
                inComment = false;
              }
            } else {
              if (lastChar == car) {
                inComment = true;
                isSlashSlashComment = true;
              } else if (lastChar == '*') {
                inComment = true;
                isSlashSlashComment = false;
              }
            }
          }
          break;
        case '\n':
          if (inComment && isSlashSlashComment) {
            // slash-slash and dash-dash comments ends with the end of line
            inComment = false;
          }
          break;
        case '{':
          if (!inQuote && !inComment) {
            inEscapeSeq++;
          }
          break;

        case '}':
          if (!inQuote && !inComment) {
            inEscapeSeq--;
            if (inEscapeSeq == 0) {
              escapeSequenceBuf.append(car);
              sqlBuffer.append(resolveEscapes(escapeSequenceBuf.toString(), protocol));
              escapeSequenceBuf.setLength(0);
              lastChar = car;
              continue;
            }
          }
          break;

        default:
          break;
      }
      lastChar = car;
      if (inEscapeSeq > 0) {
        escapeSequenceBuf.append(car);
      } else {
        sqlBuffer.append(car);
      }
    }
    if (inEscapeSeq > 0) {
      throw new SQLException(
          "Invalid escape sequence , missing closing '}' character in '" + sqlBuffer);
    }
    return sqlBuffer.toString();
  }