public override AstNode Visit(UnaryOperation node)
{
// Remove the nop expression.
if(node.GetOperation() == UnaryOperation.OpNop)
return node.GetExpression();
// Process the base expression.
Expression expr = node.GetExpression();
expr = (Expression)expr.Accept(this);
node.SetExpression(expr);
// Get the node type.
IChelaType nodeType = node.GetNodeType();
if(!nodeType.IsConstant())
return node;
// Perform the base coercion.
ConstantValue baseConstant = (ConstantValue)expr.GetNodeValue();
IChelaType baseType = expr.GetNodeType();
IChelaType baseCoercion = node.GetCoercionType();
if(baseType != baseCoercion)
baseConstant = baseConstant.Cast(baseCoercion);
// Perform the constant operation.
ConstantValue res = null;
switch(node.GetOperation())
{
case UnaryOperation.OpNop:
res = baseConstant;
break;
case UnaryOperation.OpNeg:
res = -baseConstant;
break;
case UnaryOperation.OpNot:
res = !baseConstant;
break;
case UnaryOperation.OpBitNot:
res = ~baseConstant;
break;
}
return res.ToAstNode(node.GetPosition());
}
