private static boolean postfixExpressionsAreEquivalent(
@NotNull GrUnaryExpression postfixExp1, @NotNull GrUnaryExpression postfixExp2) {
final IElementType sign1 = postfixExp1.getOperationTokenType();
final IElementType sign2 = postfixExp2.getOperationTokenType();
if (!sign1.equals(sign2)) {
return false;
}
final GrExpression operand1 = postfixExp1.getOperand();
final GrExpression operand2 = postfixExp2.getOperand();
return expressionsAreEquivalent(operand1, operand2);
}
@Override
public void visitUnaryExpression(GrUnaryExpression expression) {
final GrExpression operand = expression.getOperand();
if (operand == null) return;
if (expression.getOperationTokenType() != mLNOT) {
operand.accept(this);
visitCall(expression);
return;
}
ConditionInstruction cond = new ConditionInstruction(expression);
addNodeAndCheckPending(cond);
registerCondition(cond);
operand.accept(this);
visitCall(expression);
myConditions.removeFirstOccurrence(cond);
List<GotoInstruction> negations = collectAndRemoveAllPendingNegations(expression);
InstructionImpl head = myHead;
addNodeAndCheckPending(new PositiveGotoInstruction(expression, cond));
handlePossibleReturn(expression);
addPendingEdge(expression, myHead);
if (negations.isEmpty()) {
myHead = head;
} else {
myHead = reduceAllNegationsIntoInstruction(expression, negations);
}
}