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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Activities.XamlIntegration
{
using Microsoft.VisualBasic.Activities;
using System;
using System.Activities.Expressions;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Reflection;
using System.Runtime;
using System.Text.RegularExpressions;
using System.Windows.Markup;
using System.Xaml;
using System.Xaml.Schema;
using System.Xml.Linq;
using Microsoft.VisualBasic.Activities.XamlIntegration;
public sealed class ActivityWithResultConverter : TypeConverterBase
{
public ActivityWithResultConverter()
: base(typeof(Activity<>), typeof(ExpressionConverterHelper<>))
{
}
public ActivityWithResultConverter(Type type)
: base(type, typeof(Activity<>), typeof(ExpressionConverterHelper<>))
{
}
internal static object GetRootTemplatedActivity(IServiceProvider serviceProvider)
{
// For now, we only support references to the root Activity when we're inside an Activity.Body
// Note that in the case of nested activity bodies, this gives us the outer activity
IRootObjectProvider rootProvider =
serviceProvider.GetService(typeof(IRootObjectProvider)) as IRootObjectProvider;
if (rootProvider == null)
{
return null;
}
IAmbientProvider ambientProvider =
serviceProvider.GetService(typeof(IAmbientProvider)) as IAmbientProvider;
if (ambientProvider == null)
{
return null;
}
IXamlSchemaContextProvider schemaContextProvider =
serviceProvider.GetService(typeof(IXamlSchemaContextProvider)) as IXamlSchemaContextProvider;
if (schemaContextProvider == null)
{
return null;
}
XamlMember activityBody = GetXamlMember(schemaContextProvider.SchemaContext, typeof(Activity), "Implementation");
XamlMember dynamicActivityBody = GetXamlMember(schemaContextProvider.SchemaContext, typeof(DynamicActivity), "Implementation");
if (activityBody == null || dynamicActivityBody == null)
{
return null;
}
if (ambientProvider.GetFirstAmbientValue(null, activityBody, dynamicActivityBody) == null)
{
return null;
}
object rootActivity = rootProvider.RootObject as Activity;
return rootActivity;
}
static XamlMember GetXamlMember(XamlSchemaContext schemaContext, Type type, string memberName)
{
XamlType xamlType = schemaContext.GetXamlType(type);
if (xamlType == null)
{
return null;
}
XamlMember xamlMember = xamlType.GetMember(memberName);
return xamlMember;
}
internal sealed class ExpressionConverterHelper<T> : TypeConverterHelper<Activity<T>>
{
static Regex LiteralEscapeRegex = new Regex(@"^(%+\[)");
static Type LocationHelperType = typeof(LocationHelper<>);
TypeConverter baseConverter;
Type valueType;
LocationHelper locationHelper; // true if we're dealing with a Location
public ExpressionConverterHelper()
: this(TypeHelper.AreTypesCompatible(typeof(T), typeof(Location)))
{
}
public ExpressionConverterHelper(bool isLocationType)
{
this.valueType = typeof(T);
if (isLocationType)
{
Fx.Assert(this.valueType.IsGenericType && this.valueType.GetGenericArguments().Length == 1, "Should only get Location<T> here");
this.valueType = this.valueType.GetGenericArguments()[0];
Type concreteHelperType = LocationHelperType.MakeGenericType(typeof(T), this.valueType);
this.locationHelper = (LocationHelper)Activator.CreateInstance(concreteHelperType);
}
}
TypeConverter BaseConverter
{
get
{
if (this.baseConverter == null)
{
this.baseConverter = TypeDescriptor.GetConverter(this.valueType);
}
return this.baseConverter;
}
}
public override Activity<T> ConvertFromString(string text, ITypeDescriptorContext context)
{
if (IsExpression(text))
{
// Expression. Use the expression parser.
string expressionText = text.Substring(1, text.Length - 2);
if (this.locationHelper != null)
{
//
return (Activity<T>)this.locationHelper.CreateExpression(expressionText);
}
else
{
//
return new VisualBasicValue<T>()
{
ExpressionText = expressionText
};
}
}
else
{
if (this.locationHelper != null)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR.InvalidLocationExpression));
}
// look for "%[....]" escape pattern
if (text.EndsWith("]", StringComparison.Ordinal) && LiteralEscapeRegex.IsMatch(text))
{
// strip off the very front-most '%' from the original string
text = text.Substring(1, text.Length - 1);
}
T literalValue;
if (text is T)
{
literalValue = (T)(object)text;
}
else if (text == string.Empty) // workaround for System.Runtime.Xaml bug
{
literalValue = default(T);
}
else
{
// Literal value. Invoke the base type converter.
literalValue = (T)BaseConverter.ConvertFromString(context, text);
}
return new Literal<T> { Value = literalValue };
}
}
static bool IsExpression(string text)
{
return (text.StartsWith("[", StringComparison.Ordinal) && text.EndsWith("]", StringComparison.Ordinal));
}
// to perform the generics dance around Locations we need these helpers
abstract class LocationHelper
{
public abstract Activity CreateExpression(string expressionText);
}
class LocationHelper<TLocationValue> : LocationHelper
{
public override Activity CreateExpression(string expressionText)
{
return new VisualBasicReference<TLocationValue>()
{
ExpressionText = expressionText
};
}
}
}
}
}
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