void (PsiPrefixExpression expression, StringBuilder out, CommentTracker tracker) { final PsiJavaToken sign = expression.getOperationSign(); final IElementType tokenType = sign.getTokenType(); final PsiExpression operand = expression.getOperand(); if (JavaTokenType.EXCL.equals(tokenType)) { final Boolean value = evaluate(operand); if (value == Boolean.TRUE) { out.append(PsiKeyword.FALSE); return; } else if (value == Boolean.FALSE) { out.append(PsiKeyword.TRUE); return; } } buildSimplifiedExpression(operand, out.append(sign.getText()), tracker); }