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PruneIgnoredNodesVisitor.cs
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PruneIgnoredNodesVisitor.cs
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using System;
using System.Collections.Generic;
using System.Linq;
namespace Xamarin.Forms.Xaml
{
class PruneIgnoredNodesVisitor : IXamlNodeVisitor
{
public PruneIgnoredNodesVisitor(bool useDesignProperties = false) => UseDesignProperties = useDesignProperties;
public TreeVisitingMode VisitingMode => TreeVisitingMode.TopDown;
public bool StopOnDataTemplate => false;
public bool StopOnResourceDictionary => false;
public bool VisitNodeOnDataTemplate => true;
public bool UseDesignProperties { get; }
public bool SkipChildren(INode node, INode parentNode) => false;
public bool IsResourceDictionary(ElementNode node) => false;
public void Visit(ElementNode node, INode parentNode)
{
foreach (var propertyKvp in node.Properties)
{
var propertyName = propertyKvp.Key;
if (!((propertyKvp.Value as ValueNode)?.Value is string propertyValue))
continue;
if (!propertyName.Equals(XamlParser.McUri, "Ignorable"))
continue;
var prefixes = propertyValue.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries).ToList();
if (UseDesignProperties) //if we're in design mode for this file
{
for (var i = 0; i < prefixes.Count; i++)
if (node.NamespaceResolver.LookupNamespace(prefixes[i]) == XamlParser.XFDesignUri)
prefixes.RemoveAt(i--);
}
(parentNode.IgnorablePrefixes ?? (parentNode.IgnorablePrefixes = new List<string>())).AddRange(prefixes);
}
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)
{
}
}
}