public UnaryOperandNode VisitUnaryExpression(UnaryExpressionNode uen)
{
int temp = this.depth;
string spaces = IncreaseDepth();
this.io.WriteLine($"{spaces}UnaryExpression: (");
uen.Left.Visit(this);
this.io.WriteLine($"{spaces})");
this.depth = temp;
return(new UnaryOperandNode("", SymbolType.Invalid));
}
private Expression Expression()
{
// <expr> ::= <opnd> <op> <opnd> | <opnd>
Operand left;
Expression e;
left = Operand();
e = new UnaryExpressionNode(left);
if (this.token.SymbolType == SymbolType.Operator || this.token.SymbolType == SymbolType.Minus)
{
string op = this.token.Value;
this.token = this.scanner.NextToken();
Operand right = Operand();
e = new BinaryExpressionNode(left, op, right);
}
return(e);
}
public UnaryOperandNode VisitUnaryExpression(UnaryExpressionNode uen)
{
return(uen.Left.Visit(this));
}
