PsiExpression (PsiExpression expression) { expression = PsiUtil.skipParenthesizedExprDown(expression); if (expression instanceof PsiBinaryExpression binOp) { if (binOp.getOperationTokenType().equals(MINUS)) { Number right = JavaPsiMathUtil.getNumberFromLiteral(binOp.getROperand()); if ((right instanceof Integer || right instanceof Long) && right.longValue() == 1L) { return binOp.getLOperand(); } } } return null; }