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using System;
using System.Collections.Generic;
namespace Xamarin.Forms.Xaml
{
internal class RegisterXNamesVisitor : IXamlNodeVisitor
{
public RegisterXNamesVisitor(HydratationContext context)
{
Values = context.Values;
}
Dictionary<INode, object> Values { get; }
public TreeVisitingMode VisitingMode => TreeVisitingMode.TopDown;
public bool StopOnDataTemplate => true;
public bool StopOnResourceDictionary => false;
public bool VisitNodeOnDataTemplate => false;
public void Visit(ValueNode node, INode parentNode)
{
if (!IsXNameProperty(node, parentNode))
return;
try
{
((IElementNode)parentNode).Namescope.RegisterName((string)node.Value, Values[parentNode]);
}
catch (ArgumentException ae)
{
if (ae.ParamName != "name")
throw ae;
throw new XamlParseException($"An element with the name \"{(string)node.Value}\" already exists in this NameScope", node);
}
}
public void Visit(MarkupNode node, INode parentNode)
{
}
public void Visit(ElementNode node, INode parentNode)
{
}
public void Visit(RootNode node, INode parentNode)
{
}
public void Visit(ListNode node, INode parentNode)
{
}
static bool IsXNameProperty(ValueNode node, INode parentNode)
{
var parentElement = parentNode as IElementNode;
INode xNameNode;
if (parentElement != null && parentElement.Properties.TryGetValue(XmlName.xName, out xNameNode) && xNameNode == node)
return true;
return false;
}
}
}
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