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using System.Collections.Generic;
using System.Linq;
namespace Xamarin.Forms.Xaml
{
class PruneIgnoredNodesVisitor : IXamlNodeVisitor
{
public bool StopOnDataTemplate {
get { return false; }
}
public bool StopOnResourceDictionary {
get { return false; }
}
public bool VisitChildrenFirst {
get { return false; }
}
public void Visit(ElementNode node, INode parentNode)
{
foreach (var propertyKvp in node.Properties)
{
var propertyName = propertyKvp.Key;
var propertyValue = (propertyKvp.Value as ValueNode)?.Value as string;
if (propertyValue == null)
continue;
if (propertyName.NamespaceURI != "http://schemas.openxmlformats.org/markup-compatibility/2006" ||
propertyName.LocalName != "Ignorable")
continue;
(parentNode.IgnorablePrefixes ?? (parentNode.IgnorablePrefixes = new List<string>())).AddRange(propertyValue.Split(','));
}
foreach (var propertyKvp in node.Properties.ToList())
{
// skip d:foo="bar"
var prefix = node.NamespaceResolver.LookupPrefix(propertyKvp.Key.NamespaceURI);
if (node.SkipPrefix(prefix))
node.Properties.Remove(propertyKvp.Key);
var propNs = (propertyKvp.Value as IElementNode)?.NamespaceURI ?? "";
var propPrefix = node.NamespaceResolver.LookupPrefix(propNs);
if (node.SkipPrefix(propPrefix))
node.Properties.Remove(propertyKvp.Key);
}
foreach (var prop in node.CollectionItems.ToList())
{
var propNs = (prop as IElementNode)?.NamespaceURI ?? "";
var propPrefix = node.NamespaceResolver.LookupPrefix(propNs);
if (node.SkipPrefix(propPrefix))
node.CollectionItems.Remove(prop);
}
if (node.SkipPrefix(node.NamespaceResolver.LookupPrefix(node.NamespaceURI)))
{
node.Properties.Clear();
node.CollectionItems.Clear();
}
}
public void Visit(RootNode node, INode parentNode)
{
Visit((ElementNode)node, node);
}
public void Visit(MarkupNode node, INode parentNode)
{
}
public void Visit(ListNode node, INode parentNode)
{
foreach (var prop in node.CollectionItems.ToList())
{
var propNs = (prop as IElementNode)?.NamespaceURI ?? "";
var propPrefix = node.NamespaceResolver.LookupPrefix(propNs);
if (node.SkipPrefix(propPrefix))
node.CollectionItems.Remove(prop);
}
}
public void Visit(ValueNode node, INode parentNode)
{
}
}
}
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