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using System.Linq;
using Mono.Cecil.Cil;
using Xamarin.Forms.Xaml;
namespace Xamarin.Forms.Build.Tasks
{
class SetFieldVisitor : IXamlNodeVisitor
{
public SetFieldVisitor(ILContext context)
{
Context = context;
}
public ILContext Context { get; }
public bool VisitChildrenFirst
{
get { return false; }
}
public bool StopOnDataTemplate
{
get { return true; }
}
public bool StopOnResourceDictionary
{
get { return false; }
}
public void Visit(ValueNode node, INode parentNode)
{
if (!IsXNameProperty(node, parentNode))
return;
if (!(parentNode is RootNode))
{
//no variable assigned for root
var field = Context.Body.Method.DeclaringType.Fields.SingleOrDefault(fd => fd.Name == (string)node.Value);
if (field == null)
return;
Context.IL.Emit(OpCodes.Ldarg_0);
Context.IL.Emit(OpCodes.Ldloc, Context.Variables[(IElementNode)parentNode]);
Context.IL.Emit(OpCodes.Stfld, field);
}
}
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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