void UnaryMinusTerm(out Expression aexp)
{
bool isMinus = false; Token minusToken = null; aexp = null;
if (la.kind == 21) {
Get();
isMinus = true; minusToken = t;
}
if (la.kind == 14) {
Get();
Expression(out aexp);
Expect(15);
aexp.ParenCount += 1;
} else if (la.kind == 4) {
Get();
aexp = new Number(int.Parse(t.val)); SetPos(aexp, t);
} else if (la.kind == 2) {
Get();
aexp = new Variable(t.val); SetPos(aexp, t);
} else SynErr(34);
if (isMinus) {aexp = new UnaryMinus(aexp); SetPos(aexp, minusToken);}
}
public override void Visit(UnaryMinus exp)
{
if (exp.Expression is Number) {
exp.Parent.Replace(exp, new Number(-((Number)exp.Expression).Value));
}
}
public virtual void Visit(UnaryMinus node)
{
}
void UnaryMinusTerm(out Expression aexp)
{
bool isMinus = false; Token minusToken = null; aexp = null;
if (la.kind == 36) {
Get();
isMinus = true; minusToken = t;
}
switch (la.kind) {
case 10: {
Get();
ArithmeticExpression(out aexp);
Expect(12);
aexp.ParenCount += 1;
break;
}
case 7: {
Get();
aexp = new Number(int.Parse(t.val)); SetPos(aexp, t);
break;
}
case 17: {
Get();
aexp = new Number(int.Parse(t.val)); SetPos(aexp, t);
break;
}
case 39: {
Get();
aexp = new Bool(true); SetPos(aexp, t);
break;
}
case 40: {
Get();
aexp = new Bool(false); SetPos(aexp, t);
break;
}
case 3: {
Get();
aexp = new Variable(t.val); SetPos(aexp, t);
break;
}
case 6: {
MethodCall(out aexp, false);
break;
}
default: SynErr(47); break;
}
if (isMinus) {aexp = new UnaryMinus(aexp); SetStartPos(aexp, minusToken); SetEndPos(aexp, t);}
}
public override void Visit(UnaryMinus node)
{
List<string> children = PopChildren();
Return(SurroundWithParens("-" + children[0], node.ParenCount));
}
public virtual string Format(UnaryMinus um)
{
return SurroundWithParens("-" + Format(um.Expression), um.ParenCount);
}