public override void OnBinaryExpression(BinaryExpression node)
{
if (node.Operator == BinaryOperatorType.Assign && node.Left.ExpressionType != node.Right.ExpressionType && node.Right.ExpressionType != null)
{
if (NeedsCastWithPotentialDataLoss(node.Left.ExpressionType.Type, node.Right.ExpressionType.Type))
{
node.Replace(node.Right, CodeBuilder.CreateCast(node.Left.ExpressionType.Type, node.Right));
}
}
else if (AstUtil.GetBinaryOperatorKind(node) == BinaryOperatorKind.Arithmetic && node.ExpressionType.ElementType == TypeSystemServices.ObjectType)
{
if (TypeSystemServices.IsNumber(node.Left.ExpressionType))
{
node.ExpressionType = node.Left.ExpressionType;
node.Replace(node.Right, CodeBuilder.CreateCast(node.ExpressionType, node.Right));
}
else
{
node.ExpressionType = node.Right.ExpressionType;
node.Replace(node.Left, CodeBuilder.CreateCast(node.ExpressionType, node.Left));
}
}
base.OnBinaryExpression(node);
}
private bool FixMixedBooleanExpressionOperand(BinaryExpression node, Expression booleanSide, Expression nonBooleanSide)
{
if (booleanSide.ExpressionType == TypeSystemServices.BoolType && TypeSystemServices.IsNumber(nonBooleanSide.ExpressionType))
{
var literalExpression = nonBooleanSide as LiteralExpression;
Expression replacementNode = literalExpression != null
? (Expression)CodeBuilder.CreateBoolLiteral(Convert.ToInt32(literalExpression.ValueObject) != 0)
: CodeBuilder.CreateBoundBinaryExpression(booleanSide.ExpressionType, BinaryOperatorType.Inequality, nonBooleanSide, CodeBuilder.CreateIntegerLiteral(0));
node.Replace(nonBooleanSide, replacementNode);
return(true);
}
return(false);
}
private bool NeedsCastWithPotentialDataLoss(IType targetType, IType sourceType)
{
if (targetType == sourceType)
{
return(false);
}
if (sourceType == TypeSystemServices.ObjectType)
{
return(true);
}
if (targetType != TypeSystemServices.ObjectType && !sourceType.IsNull() && !targetType.IsAssignableFrom(sourceType))
{
if (TypeSystemServices.IsNumber(targetType) && TypeSystemServices.IsNumber(sourceType))
{
return(!IsWideningPromotion(targetType, sourceType));
}
return(TypeSystemServices.IsNumber(targetType) ^ TypeSystemServices.IsNumber(sourceType));
}
return(false);
}