private static String @Nullable [] getContentLines(PsiExpression @NotNull [] operands) {
      String[] lines = new String[operands.length];
      PsiLiteralExpression previous = null;
      for (int i = 0; i < operands.length; i++) {
        PsiLiteralExpression literal = getLiteralExpression(operands[i]);
        if (literal == null) return null;
        String line = getLiteralText(literal);
        if (line == null) return null;
        if (previous != null && !onSameLine(previous, literal) && !lines[i - 1].endsWith("\\n")) {
          lines[i - 1] += "\\\n";
        }
        previous = literal;
        lines[i] = line;
      }
      return lines;
    }
private static String @Nullable [] getContentLines(PsiExpression @NotNull [] operands)