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using System;
using System.Collections.Generic;
using System.Reflection;
using System.Xml;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Xaml.Internals
{
public class XamlServiceProvider : IServiceProvider
{
readonly Dictionary<Type, object> services = new Dictionary<Type, object>();
internal XamlServiceProvider(INode node, HydratationContext context)
{
object targetObject;
if (node != null && node.Parent != null && context.Values.TryGetValue(node.Parent, out targetObject))
IProvideValueTarget = new XamlValueTargetProvider(targetObject, node, context, null);
if (context != null)
IRootObjectProvider = new XamlRootObjectProvider(context.RootElement);
if (node != null)
{
IXamlTypeResolver = new XamlTypeResolver(node.NamespaceResolver, XamlParser.GetElementType,
context.RootElement.GetType().GetTypeInfo().Assembly);
var enode = node;
while (enode != null && !(enode is IElementNode))
enode = enode.Parent;
if (enode != null)
INameScopeProvider = new NameScopeProvider { NameScope = (enode as IElementNode).Namescope };
}
var xmlLineInfo = node as IXmlLineInfo;
if (xmlLineInfo != null)
IXmlLineInfoProvider = new XmlLineInfoProvider(xmlLineInfo);
IValueConverterProvider = new ValueConverterProvider();
}
public XamlServiceProvider()
{
IValueConverterProvider = new ValueConverterProvider();
}
internal IProvideValueTarget IProvideValueTarget
{
get { return (IProvideValueTarget)GetService(typeof (IProvideValueTarget)); }
set { services[typeof (IProvideValueTarget)] = value; }
}
internal IXamlTypeResolver IXamlTypeResolver
{
get { return (IXamlTypeResolver)GetService(typeof (IXamlTypeResolver)); }
set { services[typeof (IXamlTypeResolver)] = value; }
}
internal IRootObjectProvider IRootObjectProvider
{
get { return (IRootObjectProvider)GetService(typeof (IRootObjectProvider)); }
set { services[typeof (IRootObjectProvider)] = value; }
}
internal IXmlLineInfoProvider IXmlLineInfoProvider
{
get { return (IXmlLineInfoProvider)GetService(typeof (IXmlLineInfoProvider)); }
set { services[typeof (IXmlLineInfoProvider)] = value; }
}
internal INameScopeProvider INameScopeProvider
{
get { return (INameScopeProvider)GetService(typeof (INameScopeProvider)); }
set { services[typeof (INameScopeProvider)] = value; }
}
internal IValueConverterProvider IValueConverterProvider
{
get { return (IValueConverterProvider)GetService(typeof (IValueConverterProvider)); }
set { services[typeof (IValueConverterProvider)] = value; }
}
public object GetService(Type serviceType)
{
object service;
return services.TryGetValue(serviceType, out service) ? service : null;
}
public void Add(Type type, object service)
{
services.Add(type, service);
}
}
internal class XamlValueTargetProvider : IProvideParentValues, IProvideValueTarget
{
public XamlValueTargetProvider(object targetObject, INode node, HydratationContext context, object targetProperty)
{
Context = context;
Node = node;
TargetObject = targetObject;
TargetProperty = targetProperty;
}
INode Node { get; }
HydratationContext Context { get; }
public object TargetObject { get; }
public object TargetProperty
{
get { throw new NotImplementedException(); }
private set { }
}
IEnumerable<object> IProvideParentValues.ParentObjects
{
get
{
if (Node == null || Context == null)
yield break;
var n = Node;
object obj = null;
var context = Context;
while (n.Parent != null && context != null)
{
if (n.Parent is IElementNode)
{
if (context.Values.TryGetValue(n.Parent, out obj))
yield return obj;
else
{
context = context.ParentContext;
continue;
}
}
n = n.Parent;
}
}
}
}
public class SimpleValueTargetProvider : IProvideParentValues, IProvideValueTarget
{
readonly object[] objectAndParents;
public SimpleValueTargetProvider(object[] objectAndParents)
{
if (objectAndParents == null)
throw new ArgumentNullException("objectAndParents");
if (objectAndParents.Length == 0)
throw new ArgumentException();
this.objectAndParents = objectAndParents;
}
IEnumerable<object> IProvideParentValues.ParentObjects
{
get { return objectAndParents; }
}
object IProvideValueTarget.TargetObject
{
get { return objectAndParents[0]; }
}
object IProvideValueTarget.TargetProperty
{
get { throw new NotImplementedException(); }
}
}
public class XamlTypeResolver : IXamlTypeResolver
{
readonly Assembly currentAssembly;
readonly GetTypeFromXmlName getTypeFromXmlName;
readonly IXmlNamespaceResolver namespaceResolver;
public XamlTypeResolver(IXmlNamespaceResolver namespaceResolver, Assembly currentAssembly)
: this(namespaceResolver, XamlParser.GetElementType, currentAssembly)
{
}
internal XamlTypeResolver(IXmlNamespaceResolver namespaceResolver, GetTypeFromXmlName getTypeFromXmlName,
Assembly currentAssembly)
{
this.currentAssembly = currentAssembly;
if (namespaceResolver == null)
throw new ArgumentNullException();
if (getTypeFromXmlName == null)
throw new ArgumentNullException();
this.namespaceResolver = namespaceResolver;
this.getTypeFromXmlName = getTypeFromXmlName;
}
Type IXamlTypeResolver.Resolve(string qualifiedTypeName, IServiceProvider serviceProvider)
{
XamlParseException e;
var type = Resolve(qualifiedTypeName, serviceProvider, out e);
if (e != null)
throw e;
return type;
}
bool IXamlTypeResolver.TryResolve(string qualifiedTypeName, out Type type)
{
XamlParseException exception;
type = Resolve(qualifiedTypeName, null, out exception);
return exception == null;
}
Type Resolve(string qualifiedTypeName, IServiceProvider serviceProvider, out XamlParseException exception)
{
exception = null;
var split = qualifiedTypeName.Split(':');
if (split.Length > 2)
return null;
string prefix, name;
if (split.Length == 2)
{
prefix = split[0];
name = split[1];
}
else
{
prefix = "";
name = split[0];
}
IXmlLineInfo xmlLineInfo = null;
if (serviceProvider != null)
{
var lineInfoProvider = serviceProvider.GetService(typeof (IXmlLineInfoProvider)) as IXmlLineInfoProvider;
if (lineInfoProvider != null)
xmlLineInfo = lineInfoProvider.XmlLineInfo;
}
var namespaceuri = string.IsNullOrEmpty(prefix) ? "" : namespaceResolver.LookupNamespace(prefix);
if (namespaceuri == null)
{
exception = new XamlParseException(string.Format("No xmlns declaration for prefix \"{0}\"", prefix), xmlLineInfo);
return null;
}
return getTypeFromXmlName(new XmlType(namespaceuri, name, null), xmlLineInfo, currentAssembly, out exception);
}
internal delegate Type GetTypeFromXmlName(
XmlType xmlType, IXmlLineInfo xmlInfo, Assembly currentAssembly, out XamlParseException exception);
}
internal class XamlRootObjectProvider : IRootObjectProvider
{
public XamlRootObjectProvider(object rootObject)
{
RootObject = rootObject;
}
public object RootObject { get; }
}
public class XmlLineInfoProvider : IXmlLineInfoProvider
{
public XmlLineInfoProvider(IXmlLineInfo xmlLineInfo)
{
XmlLineInfo = xmlLineInfo;
}
public IXmlLineInfo XmlLineInfo { get; }
}
internal interface INameScopeProvider
{
INameScope NameScope { get; }
}
public class NameScopeProvider : INameScopeProvider
{
public INameScope NameScope { get; set; }
}
public class XmlNamespaceResolver : IXmlNamespaceResolver
{
readonly Dictionary<string, string> namespaces = new Dictionary<string, string>();
public IDictionary<string, string> GetNamespacesInScope(XmlNamespaceScope scope)
{
throw new NotImplementedException();
}
public string LookupNamespace(string prefix)
{
string result;
if (namespaces.TryGetValue(prefix, out result))
return result;
return null;
}
public string LookupPrefix(string namespaceName)
{
throw new NotImplementedException();
}
public void Add(string prefix, string ns)
{
namespaces.Add(prefix, ns);
}
}
}
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