public override ASTN VisitComparer([NotNull] ComparerContext context)
{
ExprNode left = VisitExpr(context.left) as ExprNode;
ExprNode right = VisitExpr(context.right) as ExprNode;
ComparerNode node;
switch (context.op.Type)
{
case EQU:
node = new EqualNode(context);
break;
case LOW:
node = new LowerNode(context);
break;
default:
node = new LowerOrEqualNode(context);
break;
}
node.Leftexpr = left;
node.Rigthexpr = right;
return(node);
}
bool Visit(ComparerContext context)
{
var type = GetType(context);
var left = Visit(context.left);
var right = Visit(context.right);
switch (context.op.Type)
{
case LOW: // Lower
{
if (left is int && right is int)
{
return((int)left < (int)right);
}
else
{
throw new Exception($"Operator '<' cannot be applied to operands of type {left.GetType()} and {right.GetType()}");
}
}
case LOE: // Lower or Equal
{
if (left is int && right is int)
{
return((int)left <= (int)right);
}
else
{
throw new Exception($"Operator '<=' cannot be applied to operands of type {left.GetType()} and {right.GetType()}");
}
}
case EQU: // Equal
{
switch (type)
{
case COOL_TYPE.INTEGER:
{
if (left is int && right is int)
{
return((int)left == (int)right);
}
} break;
case COOL_TYPE.STRING:
{
if (left is string && right is string)
{
return((string)left == (string)right);
}
} break;
case COOL_TYPE.BOOL:
{
if (left is bool && right is bool)
{
return((bool)left == (bool)right);
}
} break;
default:
throw new Exception($"Operator '==' cannot be applied to operands of type {left.GetType()} and {right.GetType()}");
}
} break;
}
throw new InvalidOperationException();
}
