private void AssignLists(IEnumerable <ItemNode> itemNodes)
{
ItemNode source = itemNodes.First(n => n.HasFlag(NodeFlags.Source));
foreach (ItemNode itemNode in itemNodes.Where(n => !n.HasFlag(NodeFlags.Source)))
{
ItemNode parentItem = source.Metadata.MemberOf.Equals(itemNode.Metadata.Parent.MemberOf) ? source : itemNodes.FirstOrDefault(n => n.Metadata == itemNode.Metadata.Parent.MemberOf);
MemberNode listMember = parentItem.FindNode(itemNode.Metadata.Parent);
MemberNode listParent = parentItem.FindNode(listMember.Metadata.Parent) ?? parentItem;
ListNode listNode = new ListNode()
{
Metadata = listMember.Metadata,
FieldIndex = listMember.FieldIndex,
Flags = NodeFlags.List,
Item = itemNode,
};
if (listMember.HasFlag(NodeFlags.Source))
{
listNode.Flags |= NodeFlags.Source;
listNode.FieldIndex = null;
}
else if (listMember.HasFlag(NodeFlags.Field))
{
listNode.Flags |= NodeFlags.Field;
}
listParent.Members.Remove(listMember);
listParent.Members.Add(listNode);
itemNode.List = listNode;
}
}
private Expression GetAssignFieldExpression(Expression parent, MemberNode memberNode, ItemNode itemNode)
{
Expression value = this.GetValueExpression(parent, memberNode);
List <Expression> expressions = new List <Expression>();
if (memberNode.HasFlag(NodeFlags.Field | NodeFlags.Source))
{
Expression arrayAccess = Expression.ArrayAccess(this.args.Fields, Expression.Constant(memberNode.FieldIndex.Value));
Expression assign = Expression.Assign(arrayAccess, this.args.Source);
expressions.Add(assign);
}
else if (memberNode.HasFlag(NodeFlags.Field))
{
Expression arrayAccess = Expression.ArrayAccess(this.args.Fields, Expression.Constant(memberNode.FieldIndex.Value));
Expression name = this.GetNameExpression(itemNode, memberNode);
Expression attribute = this.GetAttributeExpression(memberNode);
Expression index = this.GetEnumeratorIndex(itemNode.List);
Expression binder = this.GetBinderExpression(memberNode);
Expression model = this.args.Model;
ConstructorInfo constructor = typeof(Field <,>).MakeGenericType(value.Type, parent.Type).GetConstructors()[0];
Expression newField = Expression.New(constructor, name, attribute, value, parent, binder, index, model);
Expression assign = Expression.Assign(arrayAccess, newField);
expressions.Add(assign);
}
if (memberNode.Members.Count > 0)
{
Expression[] memberExpressions = memberNode.Members.Select(n => this.GetAssignFieldExpression(value, n, itemNode)).ToArray();
Expression[] missingExpressions = this.GetFieldNodes(memberNode).Select(n => this.GetMissingExpression(itemNode, n)).ToArray();
if (this.IsNotNullableValueType(value.Type))
{
expressions.Add(this.GetBlockOrExpression(memberExpressions));
}
else
{
Expression isNull = Expression.ReferenceEqual(value, Expression.Constant(null, value.Type));
Expression ifTrue = this.GetBlockOrExpression(missingExpressions);
Expression ifFalse = this.GetBlockOrExpression(memberExpressions);
Expression ifBlock = Expression.IfThenElse(isNull, ifTrue, ifFalse);
expressions.Add(ifBlock);
}
}
if (memberNode.HasFlag(NodeFlags.List))
{
ListNode listNode = (ListNode)memberNode;
expressions.Add(this.GetAssignEnumeratorExpression(value, listNode));
}
return(this.GetBlockOrExpression(expressions));
}
private Expression GetAttributeExpression(MemberNode memberNode)
{
if (memberNode.HasFlag(NodeFlags.Source))
{
return(Expression.Property(this.args.Source, nameof(IField.Identity)));
}
return(Expression.ArrayAccess(this.args.Attributes, Expression.Constant(memberNode.FieldIndex.Value)));
}
private Expression GetFieldExpression(MemberNode memberNode)
{
if (memberNode.HasFlag(NodeFlags.Source))
{
return(this.args.Source);
}
else if (memberNode.FieldIndex != null)
{
return(Expression.ArrayAccess(this.args.Fields, Expression.Constant(memberNode.FieldIndex.Value)));
}
throw new InvalidOperationException();
}
private Expression GetNameExpression(ItemNode itemNode, MemberNode memberNode)
{
Expression itemName = this.args.ItemVars[itemNode.ItemIndex];
Expression memberName;
if (memberNode.HasFlag(NodeFlags.Item))
{
memberName = itemName;
}
else
{
Expression name = Expression.Constant(memberNode.Metadata.Identity.Notation.Path(itemNode.Metadata.Identity.Name, memberNode.Metadata.Identity.Name));
memberName = this.GetNotationCombine(itemName, name);
}
return(memberName);
}
