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using System.Collections.Generic;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Xaml
{
internal class NamescopingVisitor : IXamlNodeVisitor
{
readonly Dictionary<INode, INameScope> scopes = new Dictionary<INode, INameScope>();
public NamescopingVisitor(HydratationContext context)
{
Values = context.Values;
}
Dictionary<INode, object> Values { get; set; }
public bool VisitChildrenFirst
{
get { return false; }
}
public bool StopOnDataTemplate
{
get { return false; }
}
public bool StopOnResourceDictionary
{
get { return false; }
}
public void Visit(ValueNode node, INode parentNode)
{
scopes[node] = scopes[parentNode];
}
public void Visit(MarkupNode node, INode parentNode)
{
scopes[node] = scopes[parentNode];
}
public void Visit(ElementNode node, INode parentNode)
{
var ns = parentNode == null || IsDataTemplate(node, parentNode) || IsStyle(node, parentNode)
? new NameScope()
: scopes[parentNode];
node.Namescope = ns;
scopes[node] = ns;
}
public void Visit(RootNode node, INode parentNode)
{
var ns = new NameScope();
node.Namescope = ns;
scopes[node] = ns;
}
public void Visit(ListNode node, INode parentNode)
{
scopes[node] = scopes[parentNode];
}
static bool IsDataTemplate(INode node, INode parentNode)
{
var parentElement = parentNode as IElementNode;
INode createContent;
if (parentElement != null && parentElement.Properties.TryGetValue(XmlName._CreateContent, out createContent) &&
createContent == node)
return true;
return false;
}
static bool IsStyle(INode node, INode parentNode)
{
var pnode = parentNode as ElementNode;
return pnode != null && pnode.XmlType.Name == "Style";
}
}
}
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