public @NotNull TextRange getTextRange() {
    PsiExpression[] operands = myExpression.getOperands();
    if (operands.length > myLastOperand + 1) {
      return new TextRange(0, operands[myLastOperand].getStartOffsetInParent() + operands[myLastOperand].getTextLength());
    }
    throw new IllegalStateException("Not enough operands");
  }
public @NotNull TextRange getTextRange()