public static ClientPrepareResult parameterParts()

in src/main/java/org/mariadb/jdbc/internal/util/dao/ClientPrepareResult.java [93:221]
117 lines of code
46 McCabe index (conditional complexity)

  public static ClientPrepareResult parameterParts(String queryString, boolean noBackslashEscapes) {
    boolean reWritablePrepare = false;
    boolean multipleQueriesPrepare = true;
    List<byte[]> partList = new ArrayList<>();
    LexState state = LexState.Normal;
    char lastChar = '\0';
    boolean endingSemicolon = false;

    boolean singleQuotes = false;
    int lastParameterPosition = 0;

    char[] query = queryString.toCharArray();
    int queryLength = query.length;
    for (int i = 0; i < queryLength; i++) {

      char car = query[i];
      if (state == LexState.Escape
          && !((car == '\'' && singleQuotes) || (car == '"' && !singleQuotes))) {
        state = LexState.String;
        lastChar = car;
        continue;
      }
      switch (car) {
        case '*':
          if (state == LexState.Normal && lastChar == '/') {
            state = LexState.SlashStarComment;
          }
          break;

        case '/':
          if (state == LexState.SlashStarComment && lastChar == '*') {
            state = LexState.Normal;
          } else if (state == LexState.Normal && lastChar == '/') {
            state = LexState.EOLComment;
          }
          break;

        case '#':
          if (state == LexState.Normal) {
            state = LexState.EOLComment;
          }
          break;

        case '-':
          if (state == LexState.Normal && lastChar == '-') {
            state = LexState.EOLComment;
            multipleQueriesPrepare = false;
          }
          break;

        case '\n':
          if (state == LexState.EOLComment) {
            multipleQueriesPrepare = true;
            state = LexState.Normal;
          }
          break;

        case '"':
          if (state == LexState.Normal) {
            state = LexState.String;
            singleQuotes = false;
          } else if (state == LexState.String && !singleQuotes) {
            state = LexState.Normal;
          } else if (state == LexState.Escape && !singleQuotes) {
            state = LexState.String;
          }
          break;

        case '\'':
          if (state == LexState.Normal) {
            state = LexState.String;
            singleQuotes = true;
          } else if (state == LexState.String && singleQuotes) {
            state = LexState.Normal;
          } else if (state == LexState.Escape && singleQuotes) {
            state = LexState.String;
          }
          break;

        case '\\':
          if (noBackslashEscapes) {
            break;
          }
          if (state == LexState.String) {
            state = LexState.Escape;
          }
          break;
        case ';':
          if (state == LexState.Normal) {
            endingSemicolon = true;
            multipleQueriesPrepare = false;
          }
          break;
        case '?':
          if (state == LexState.Normal) {
            partList.add(
                queryString.substring(lastParameterPosition, i).getBytes(StandardCharsets.UTF_8));
            lastParameterPosition = i + 1;
          }
          break;
        case '`':
          if (state == LexState.Backtick) {
            state = LexState.Normal;
          } else if (state == LexState.Normal) {
            state = LexState.Backtick;
          }
          break;
        default:
          // multiple queries
          if (state == LexState.Normal && endingSemicolon && ((byte) car >= 40)) {
            endingSemicolon = false;
            multipleQueriesPrepare = true;
          }
          break;
      }
      lastChar = car;
    }
    if (lastParameterPosition == 0) {
      partList.add(queryString.getBytes(StandardCharsets.UTF_8));
    } else {
      partList.add(
          queryString
              .substring(lastParameterPosition, queryLength)
              .getBytes(StandardCharsets.UTF_8));
    }

    return new ClientPrepareResult(
        queryString, partList, reWritablePrepare, multipleQueriesPrepare, false);
  }