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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Text;
using System.Windows.Markup;
using System.Globalization;
namespace System.Windows.Markup.Primitives
{
/// <summary>
/// Utility class use as a base class for classes wrap another
/// instance by delegating MarkupItem implementation to that
/// instance.
/// </summary>
internal class MarkupObjectWrapper : MarkupObject
{
MarkupObject _baseObject;
public MarkupObjectWrapper(MarkupObject baseObject)
{
_baseObject = baseObject;
}
public override void AssignRootContext(IValueSerializerContext context)
{
_baseObject.AssignRootContext(context);
}
public override AttributeCollection Attributes
{
get { return _baseObject.Attributes; }
}
public override Type ObjectType
{
get { return _baseObject.ObjectType; }
}
public override object Instance
{
get { return _baseObject.Instance; }
}
internal override IEnumerable<MarkupProperty> GetProperties(bool mapToConstructorArgs)
{
return _baseObject.GetProperties(mapToConstructorArgs);
}
}
/// <summary>
/// Utility class use as a base class for classes wrap another
/// instance by delegating MarkupProperty implementation to that
/// instance.
/// </summary>
internal class MarkupPropertyWrapper : MarkupProperty
{
MarkupProperty _baseProperty;
/*
protected MarkupProperty BaseProperty
{
get { return _baseProperty; }
}
*/
public MarkupPropertyWrapper(MarkupProperty baseProperty)
{
_baseProperty = baseProperty;
}
public override AttributeCollection Attributes
{
get { return _baseProperty.Attributes; }
}
public override IEnumerable<MarkupObject> Items
{
get { return _baseProperty.Items; }
}
public override string Name
{
get { return _baseProperty.Name; }
}
public override Type PropertyType
{
get { return _baseProperty.PropertyType; }
}
public override string StringValue
{
get { return _baseProperty.StringValue; }
}
public override IEnumerable<Type> TypeReferences
{
get { return _baseProperty.TypeReferences; }
}
public override object Value
{
get { return _baseProperty.Value; }
}
public override DependencyProperty DependencyProperty
{
get { return _baseProperty.DependencyProperty; }
}
public override bool IsAttached
{
get { return _baseProperty.IsAttached; }
}
public override bool IsComposite
{
get { return _baseProperty.IsComposite; }
}
public override bool IsConstructorArgument
{
get { return _baseProperty.IsConstructorArgument; }
}
public override bool IsKey
{
get { return _baseProperty.IsKey; }
}
public override bool IsValueAsString
{
get { return _baseProperty.IsValueAsString; }
}
public override bool IsContent
{
get { return _baseProperty.IsContent; }
}
public override PropertyDescriptor PropertyDescriptor
{
get { return _baseProperty.PropertyDescriptor; }
}
/// <summary>
/// Checks to see that each markup object is of a public type. Used in serialization.
///
/// This implementation just checks the base property.
/// </summary>
internal override void VerifyOnlySerializableTypes()
{
_baseProperty.VerifyOnlySerializableTypes();
}
}
/// <summary>
/// A MarkupItem wrapper that creates an ExtensionSimplifierProperty wrapper
/// for every property returned. All other implementation is delegated to
/// the wrapped item.
/// </summary>
internal class ExtensionSimplifierMarkupObject : MarkupObjectWrapper
{
IValueSerializerContext _context;
public ExtensionSimplifierMarkupObject(MarkupObject baseObject, IValueSerializerContext context)
: base(baseObject)
{
_context = context;
}
/// This is placed in its own method to avoid accessing base.Properties from the
/// iterator class generated by the code below because C# produces unverifiable
/// code for the expression.
private IEnumerable<MarkupProperty> GetBaseProperties(bool mapToConstructorArgs) {
return base.GetProperties(mapToConstructorArgs);
}
internal override IEnumerable<MarkupProperty> GetProperties(bool mapToConstructorArgs)
{
foreach (MarkupProperty property in GetBaseProperties(mapToConstructorArgs))
{
yield return new ExtensionSimplifierProperty(property, _context);
}
}
public override void AssignRootContext(IValueSerializerContext context)
{
_context = context;
base.AssignRootContext(context);
}
}
/// <summary>
/// A MarkupProperty wrapper that creates simplifies items for objects
/// of type MarkupExtension to a string if all its properties can be
/// simplified into a string. This is recursive in that a markup extension
/// can contain references to other markup extensions which are themselves
/// simplified.
/// </summary>
internal class ExtensionSimplifierProperty : MarkupPropertyWrapper
{
IValueSerializerContext _context;
public ExtensionSimplifierProperty(MarkupProperty baseProperty, IValueSerializerContext context) : base(baseProperty)
{
_context = context;
}
public override bool IsComposite
{
get
{
// See if we can convert an extension into a string.
if (!base.IsComposite)
{
// If it is already a string then we can.
return false;
}
// If the property is a collection, this property is a composite.
if (IsCollectionProperty)
{
return true;
}
bool first = true;
foreach (MarkupObject item in Items)
{
// If there is more than one MarkupExtension, we can't.
// If it is not a markup extension we can't.
if (!first ||
!typeof(MarkupExtension).IsAssignableFrom(item.ObjectType))
{
return true;
}
first = false;
// If any of the properties are composite we can't. This is recursive to this
// routine because of the wrapping below.
item.AssignRootContext(_context);
foreach (MarkupProperty property in item.Properties)
{
if (property.IsComposite)
{
return true;
}
}
}
// We can turn this into a string if we have seen at least one item
return first;
}
}
/// This is placed in its own method to avoid accessing base.Items from the
/// iterator class generated by the code below because C# produces unverifiable
/// code for the expression.
private IEnumerable<MarkupObject> GetBaseItems()
{
return base.Items;
}
public override IEnumerable<MarkupObject> Items
{
get
{
// Wrap all of the items from the property we are wrapping.
foreach (MarkupObject baseItem in GetBaseItems())
{
ExtensionSimplifierMarkupObject item = new ExtensionSimplifierMarkupObject(baseItem, _context);
item.AssignRootContext(_context);
yield return item;
}
}
}
private const int EXTENSIONLENGTH = 9; // the number of characters in the string "Extension"
public override string StringValue
{
get
{
string result = null;
if (!base.IsComposite)
{
// Escape the text as necessary to avoid being mistaken for a MarkupExtension.
result = MarkupExtensionParser.AddEscapeToLiteralString(base.StringValue);
}
else
{
// Convert the markup extension into a string
foreach (MarkupObject item in Items)
{
result = ConvertMarkupItemToString(item);
break;
}
if (result == null)
{
Debug.Fail("No items where found and IsComposite return true");
result = "";
}
}
return result;
}
}
private string ConvertMarkupItemToString(MarkupObject item)
{
ValueSerializer typeSerializer = _context.GetValueSerializerFor(typeof(Type));
Debug.Assert(typeSerializer != null, "Could not retrieve typeSerializer for Type");
// Serialize the markup extension into a string
StringBuilder resultBuilder = new StringBuilder();
resultBuilder.Append('{');
string typeName = typeSerializer.ConvertToString(item.ObjectType, _context);
if (typeName.EndsWith("Extension", StringComparison.Ordinal))
{
// The "Extension" suffix is optional, much like the Attribute suffix of an Attribute.
// The normalized version is without the suffix.
resultBuilder.Append(typeName, 0, typeName.Length - EXTENSIONLENGTH);
}
else
{
resultBuilder.Append(typeName);
}
bool first = true;
bool propertyWritten = false;
foreach (MarkupProperty property in item.Properties)
{
resultBuilder.Append(first ? " " : ", ");
first = false;
if (!property.IsConstructorArgument)
{
resultBuilder.Append(property.Name);
resultBuilder.Append('=');
propertyWritten = true;
}
else
{
Debug.Assert(!propertyWritten, "An argument was returned after a property was set. All arguments must be returned first and in order");
}
ReadOnlySpan<char> value = property.StringValue;
if (!value.IsEmpty)
{
if (value[0] == '{')
{
if (value.Length > 1 && value[1] == '}')
{
// It is a literal quote, remove the literals and write the text with escapes.
value = value.Slice(2);
}
else
{
// It is a nested markup-extension, just insert the text literally.
resultBuilder.Append(value);
continue;
}
}
// Escape the string
for (int i = 0; i < value.Length; i++)
{
char ch = value[i];
switch (ch)
{
case '{':
resultBuilder.Append(@"\{");
break;
case '}':
resultBuilder.Append(@"\}");
break;
case ',':
resultBuilder.Append(@"\,");
break;
default:
resultBuilder.Append(ch);
break;
}
}
}
}
resultBuilder.Append('}');
return resultBuilder.ToString();
}
/// <summary>
/// Checks to see that each markup object is of a public type. Used in serialization.
///
/// This implementation checks the base property, checks the item's type, and recursively checks each of
/// the item's properties.
/// </summary>
internal override void VerifyOnlySerializableTypes()
{
base.VerifyOnlySerializableTypes();
if(base.IsComposite)
{
foreach (MarkupObject item in Items)
{
MarkupWriter.VerifyTypeIsSerializable(item.ObjectType);
foreach (MarkupProperty property in item.Properties)
{
property.VerifyOnlySerializableTypes();
}
}
}
}
}
}
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