/
RegisterXNamesVisitor.cs
73 lines (63 loc) · 2.01 KB
/
RegisterXNamesVisitor.cs
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using System;
using System.Collections.Generic;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Xaml
{
class RegisterXNamesVisitor : IXamlNodeVisitor
{
public RegisterXNamesVisitor(HydrationContext context)
{
Context = context;
Values = context.Values;
}
Dictionary<INode, object> Values { get; }
HydrationContext Context { get; }
public TreeVisitingMode VisitingMode => TreeVisitingMode.TopDown;
public bool StopOnDataTemplate => true;
public bool StopOnResourceDictionary => false;
public bool VisitNodeOnDataTemplate => false;
public bool SkipChildren(INode node, INode parentNode) => false;
public bool IsResourceDictionary(ElementNode node) => typeof(ResourceDictionary).IsAssignableFrom(Context.Types[node]);
public void Visit(ValueNode node, INode parentNode)
{
if (!IsXNameProperty(node, parentNode))
return;
try {
((IElementNode)parentNode).NameScopeRef.NameScope.RegisterName((string)node.Value, Values[parentNode]);
}
catch (ArgumentException ae) {
if (ae.ParamName != "name")
throw ae;
var xpe = new XamlParseException($"An element with the name \"{(string)node.Value}\" already exists in this NameScope", node);
if (Context.ExceptionHandler != null) {
Context.ExceptionHandler(xpe);
return;
}
throw xpe;
}
catch (KeyNotFoundException knfe) {
if (Context.ExceptionHandler != null) {
Context.ExceptionHandler(knfe);
return;
}
throw knfe;
}
if (Values[parentNode] is Element element)
element.StyleId = element.StyleId ?? (string)node.Value;
}
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)
=> parentNode is IElementNode parentElement && parentElement.Properties.TryGetValue(XmlName.xName, out INode xNameNode) && xNameNode == node;
}
}