String (String expressionText, PsiElement context) { if (expressionText.startsWith("-")) { final String negatedExpressionText = expressionText.substring(1); final Object lhConstant = computeConstant(negatedExpressionText, context); if (lhConstant != null) { return " - " + lhConstant.toString(); } return " + (" + expressionText + ")"; } return " + " + expressionText; }