private void GenerateValueMemberBlock(TypeToken typeToken, IMethodBlock memberAccess, Method.BlockCollection block)
{
var instanceInitializer = CreateInstanceInitializer(typeToken, memberAccess);
var defaultInstanceInitializer = instanceInitializer == default(IMethodBlock);
if (defaultInstanceInitializer && typeToken.IsClass)
{
instanceInitializer = new Method.Assignment(memberAccess, typeToken.NewExpression().ToMethodBlock());
}
if (instanceInitializer != default)
{
block.Children.Add(instanceInitializer);
}
if (!defaultInstanceInitializer)
{
return;
}
foreach (var subMemberToken in MemberProvider(typeToken))
{
GenerateMemberBlock(subMemberToken, memberAccess, block);
}
}
public virtual Expression ToExpression()
{
var blockBody = new List <Expression>();
// AccessExpression is null on the root node (It's a dummy node)
// ReadExpression.Count > 1 can only happen if we decided to roll a loop, in which case all elements are identical.
// ReadExpression.Count = 0 can happen if the type is a value type. Otherwise this is new T[...] or new T().
if (AccessExpression != null)
{
if (ReadExpression.Count > 0)
{
blockBody.Add(Expression.Assign(AccessExpression, ReadExpression[0]));
}
else if (TypeToken.IsArray)
{
blockBody.Add(Expression.Assign(AccessExpression,
TypeToken.GetElementTypeToken().NewArrayBounds(Expression.Constant(MemberToken.Cardinality))));
}
else if (TypeToken.IsClass)
{
if (!TypeToken.HasDefaultConstructor)
{
throw new InvalidOperationException("Missing default constructor for " + TypeToken.Name);
}
blockBody.Add(Expression.Assign(AccessExpression, TypeToken.NewExpression()));
}
}
if (Children.Count > 0)
{
// Produce children if there are any
foreach (var child in Children)
{
blockBody.Add(child.ToExpression());
}
// Assert that there is at least one node in the block emitted.
if (blockBody.Count == 0)
{
throw new InvalidOperationException("Empty block");
}
}
// We allow empty blocks if there are no children for primitive types
if (blockBody.Count == 0)
{
return(Expression.Empty());
}
// If there's only one expression, just return it.
if (blockBody.Count == 1)
{
return(blockBody[0]);
}
return(Expression.Block(blockBody));
}