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WorkflowBuilder.cs
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WorkflowBuilder.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Bonsai.Dag;
using System.Xml.Serialization;
using System.IO;
using Bonsai.Expressions;
using System.Reactive.Linq;
using System.Reflection;
using System.Xml.Schema;
using System.Xml;
using System.Diagnostics;
using System.Reflection.Emit;
using Bonsai.Properties;
using System.Xml.Xsl;
using System.ComponentModel;
using System.Globalization;
using Microsoft.CSharp;
using System.CodeDom;
namespace Bonsai
{
/// <summary>
/// Represents an XML serializable expression builder workflow container.
/// </summary>
public class WorkflowBuilder : IXmlSerializable
{
readonly ExpressionBuilderGraph workflow;
const string DynamicAssemblyPrefix = "@Dynamic";
const string VersionAttributeName = "Version";
const string IncludeWorkflowTypeName = "IncludeWorkflow";
const string TypeArgumentsAttributeName = "TypeArguments";
const string ExtensionTypeNodeName = "ExtensionTypes";
const string DescriptionElementName = "Description";
const string WorkflowNodeName = "Workflow";
const string TypeNodeName = "Type";
/// <summary>
/// Initializes a new instance of the <see cref="WorkflowBuilder"/> class.
/// </summary>
public WorkflowBuilder()
: this(new ExpressionBuilderGraph())
{
}
/// <summary>
/// Initializes a new instance of the <see cref="WorkflowBuilder"/> class with the
/// specified workflow instance.
/// </summary>
/// <param name="workflow">
/// The <see cref="ExpressionBuilderGraph"/> that will be used by this builder.
/// </param>
public WorkflowBuilder(ExpressionBuilderGraph workflow)
{
this.workflow = workflow ?? throw new ArgumentNullException(nameof(workflow));
}
/// <summary>
/// Gets or sets a description for the serializable workflow.
/// </summary>
public string Description { get; set; }
/// <summary>
/// Gets the <see cref="ExpressionBuilderGraph"/> instance used by this builder.
/// </summary>
public ExpressionBuilderGraph Workflow
{
get { return workflow; }
}
/// <summary>
/// Gets a <see cref="XmlSerializer"/> instance that can be used to serialize
/// or deserialize a <see cref="WorkflowBuilder"/>.
/// </summary>
public static XmlSerializer Serializer
{
get { return SerializerFactory.instance; }
}
/// <summary>
/// Reads workflow metadata from the serializable XML workflow representation
/// at the specified URI.
/// </summary>
/// <param name="inputUri">The URI for the file containing the XML data.</param>
/// <returns>
/// A <see cref="WorkflowMetadata"/> instance containing the retrieved metadata.
/// </returns>
public static WorkflowMetadata ReadMetadata(string inputUri)
{
using var reader = XmlReader.Create(inputUri);
return ReadMetadata(reader);
}
/// <summary>
/// Reads workflow metadata from the serializable XML workflow representation.
/// </summary>
/// <param name="reader">The <see cref="XmlReader"/> stream from which the metadata is retrieved.</param>
/// <returns>
/// A <see cref="WorkflowMetadata"/> instance containing the retrieved metadata.
/// </returns>
public static WorkflowMetadata ReadMetadata(XmlReader reader)
{
var metadata = new WorkflowMetadata();
var serializerNamespaces = new SerializerNamespaces();
if (reader.MoveToFirstAttribute())
{
do
{
if (reader.Prefix != "xmlns") continue;
serializerNamespaces.Add(reader.LocalName, reader.Value);
}
while (reader.MoveToNextAttribute());
}
reader.ReadStartElement(typeof(WorkflowBuilder).Name);
if (reader.IsStartElement(DescriptionElementName))
{
metadata.Description = reader.ReadElementContentAsString();
}
var types = new HashSet<Type>();
var workflowMarkup = string.Empty;
if (reader.IsStartElement(WorkflowNodeName))
{
if (reader.NamespaceURI != Constants.XmlNamespace)
{
workflowMarkup = ConvertDescriptorMarkup(reader.ReadOuterXml());
}
else workflowMarkup = ReadXmlExtensions(reader, types, serializerNamespaces);
}
if (reader.ReadToNextSibling(ExtensionTypeNodeName))
{
reader.ReadStartElement();
while (reader.ReadToNextSibling(TypeNodeName))
{
var typeName = reader.ReadElementString();
var type = LookupType(typeName);
var proxyTypeAttribute = (ProxyTypeAttribute)Attribute.GetCustomAttribute(type, typeof(ProxyTypeAttribute));
if (proxyTypeAttribute != null) type = proxyTypeAttribute.Destination;
types.Add(type);
}
if (reader.NodeType == XmlNodeType.EndElement && reader.Name == ExtensionTypeNodeName)
{
reader.ReadEndElement();
}
types.ExceptWith(SerializerExtraTypes);
metadata.Legacy = true;
}
metadata.Types = types;
metadata.WorkflowMarkup = workflowMarkup;
return metadata;
}
#region IXmlSerializable Members
XmlSchema IXmlSerializable.GetSchema()
{
return null;
}
void IXmlSerializable.ReadXml(XmlReader reader)
{
var metadata = ReadMetadata(reader);
Description = metadata.Description;
var serializer = metadata.Legacy ? GetXmlSerializerLegacy(metadata.Types) : GetXmlSerializer(metadata.Types);
using (var workflowReader = new StringReader(metadata.WorkflowMarkup))
{
var descriptor = (ExpressionBuilderGraphDescriptor)serializer.Deserialize(workflowReader);
workflow.AddDescriptor(descriptor);
}
reader.ReadEndElement();
}
void IXmlSerializable.WriteXml(XmlWriter writer)
{
var types = new HashSet<Type>();
foreach (var type in GetExtensionTypes(workflow))
{
if (!type.IsPublic)
{
throw new InvalidOperationException(Resources.Exception_SerializingNonPublicType);
}
AddExtensionType(types, type);
}
var serializer = GetXmlSerializer(types, out Dictionary<string, GenericTypeCode> genericTypes);
writer = new XmlExtensionWriter(writer, genericTypes);
var assembly = Assembly.GetExecutingAssembly();
var versionInfo = FileVersionInfo.GetVersionInfo(assembly.Location);
writer.WriteAttributeString(VersionAttributeName, versionInfo.ProductVersion);
var namespaceDeclarations = GetXmlSerializerNamespaces(types);
foreach (var qname in namespaceDeclarations)
{
writer.WriteAttributeString("xmlns", qname.Name, null, qname.Namespace);
}
var description = Description;
if (!string.IsNullOrEmpty(description))
{
writer.WriteElementString(DescriptionElementName, description);
}
var serializerNamespaces = new XmlSerializerNamespaces();
serializerNamespaces.Add(string.Empty, Constants.XmlNamespace);
serializer.Serialize(writer, workflow.ToDescriptor(), serializerNamespaces);
}
#endregion
#region SerializerFactory
static class SerializerFactory
{
internal static readonly XmlSerializer instance = new XmlSerializer(typeof(WorkflowBuilder), Constants.XmlNamespace);
}
#endregion
#region XmlSerializer Cache
static HashSet<Type> serializerTypes;
static XmlSerializer serializerCache;
static Dictionary<string, GenericTypeCode> genericTypeCache;
static readonly CSharpCodeProvider codeProvider = new CSharpCodeProvider();
static readonly object cacheLock = new object();
static readonly string SystemNamespace = GetXmlNamespace(typeof(object));
static readonly string SystemCollectionsGenericNamespace = GetXmlNamespace(typeof(IEnumerable<>));
static readonly Type[] SerializerExtraTypes = GetDefaultSerializerTypes().ToArray();
static readonly Type[] SerializerLegacyTypes = GetSerializerLegacyTypes().ToArray();
static IEnumerable<Type> GetDefaultSerializerTypes()
{
var builderType = typeof(ExpressionBuilder);
return builderType.Assembly.GetTypes().Where(type =>
!type.IsGenericType && !type.IsAbstract &&
type.Namespace == builderType.Namespace &&
Attribute.IsDefined(type, typeof(XmlTypeAttribute), false) &&
!Attribute.IsDefined(type, typeof(ObsoleteAttribute), false));
}
static IEnumerable<Type> GetSerializerLegacyTypes()
{
var builderType = typeof(ExpressionBuilder);
return builderType.Assembly.GetTypes().Where(type =>
!type.IsGenericType && !type.IsAbstract &&
type.Namespace == builderType.Namespace &&
Attribute.IsDefined(type, typeof(XmlTypeAttribute), false) &&
Attribute.IsDefined(type, typeof(ObsoleteAttribute), false) &&
Attribute.IsDefined(type, typeof(ProxyTypeAttribute), false))
#pragma warning disable CS0612 // Type or member is obsolete
.Concat(new[]
{
typeof(SourceBuilder),
typeof(CreateAsyncBuilder),
typeof(WindowWorkflowBuilder)
});
#pragma warning restore CS0612 // Type or member is obsolete
}
static string GetXmlNamespace(Type type)
{
if (type.Assembly == typeof(WorkflowBuilder).Assembly &&
type.Namespace == typeof(ExpressionBuilder).Namespace)
{
return Constants.XmlNamespace;
}
return ClrNamespace.FromType(type).ToString();
}
static void GetClrNamespaces(Type type, Dictionary<ClrNamespace, Assembly> clrNamespaces)
{
clrNamespaces[ClrNamespace.FromType(type)] = type.Assembly;
if (type.IsGenericType)
{
var typeArguments = type.GetGenericArguments();
for (int i = 0; i < typeArguments.Length; i++)
{
GetClrNamespaces(typeArguments[i], clrNamespaces);
}
}
}
static SerializerNamespaces GetXmlSerializerNamespaces(HashSet<Type> types)
{
int namespaceIndex = 1;
var clrNamespaces = new Dictionary<ClrNamespace, Assembly>();
foreach (var type in types) GetClrNamespaces(type, clrNamespaces);
var serializerNamespaces = new SerializerNamespaces();
serializerNamespaces.Add("xsi", XmlSchema.InstanceNamespace);
foreach (var item in clrNamespaces)
{
var clrNamespace = item.Key;
if (clrNamespace.IsDefault) continue;
var xmlNamespace = clrNamespace.ToString();
if (xmlNamespace == SystemNamespace) serializerNamespaces.Add("sys", SystemNamespace);
else if (xmlNamespace == SystemCollectionsGenericNamespace) serializerNamespaces.Add("scg", SystemCollectionsGenericNamespace);
else
{
var assembly = item.Value;
var prefix = (from attribute in assembly.GetCustomAttributes<XmlNamespacePrefixAttribute>()
let attributeNamespace = ClrNamespace.FromUri(attribute.XmlNamespace)
where attributeNamespace.Namespace == clrNamespace.Namespace
select attribute.Prefix)
.FirstOrDefault();
if (prefix == null) prefix = "p" + namespaceIndex++;
serializerNamespaces.Add(prefix, xmlNamespace);
}
}
return serializerNamespaces;
}
static void AddTypeAttributeOverrides(XmlAttributeOverrides overrides, IEnumerable<Type> types)
{
foreach (var type in types)
{
var xmlTypeAttribute = (XmlTypeAttribute)type.GetCustomAttribute(typeof(XmlTypeAttribute));
if (xmlTypeAttribute != null)
{
overrides.Add(type, new XmlAttributes { XmlType = xmlTypeAttribute });
}
}
}
static XmlSerializer GetXmlSerializerLegacy(HashSet<Type> serializerTypes)
{
var overrides = new XmlAttributeOverrides();
foreach (var type in serializerTypes)
{
var obsolete = Attribute.IsDefined(type, typeof(ObsoleteAttribute), false);
var xmlTypeDefined = Attribute.IsDefined(type, typeof(XmlTypeAttribute), false);
if (xmlTypeDefined && !obsolete) continue;
var attributes = new XmlAttributes();
if (obsolete && xmlTypeDefined)
{
var xmlType = (XmlTypeAttribute)Attribute.GetCustomAttribute(type, typeof(XmlTypeAttribute));
attributes.XmlType = xmlType;
}
else attributes.XmlType = new XmlTypeAttribute { Namespace = GetXmlNamespace(type) };
overrides.Add(type, attributes);
}
var extraTypes = serializerTypes.Concat(SerializerExtraTypes).Concat(SerializerLegacyTypes).ToArray();
AddTypeAttributeOverrides(overrides, SerializerLegacyTypes);
overrides.Add(typeof(IndexBuilder), new XmlAttributes { XmlType = new XmlTypeAttribute() { Namespace = Constants.XmlNamespace } });
var rootAttribute = new XmlRootAttribute(WorkflowNodeName) { Namespace = Constants.XmlNamespace };
return new XmlSerializer(typeof(ExpressionBuilderGraphDescriptor), overrides, extraTypes, rootAttribute, null);
}
static XmlSerializer GetXmlSerializer(HashSet<Type> types)
{
return GetXmlSerializer(types, out _);
}
static XmlSerializer GetXmlSerializer(HashSet<Type> types, out Dictionary<string, GenericTypeCode> genericTypes)
{
lock (cacheLock)
{
if (serializerCache == null || !types.IsSubsetOf(serializerTypes))
{
if (serializerTypes == null) serializerTypes = types;
else serializerTypes.UnionWith(types);
genericTypeCache = new Dictionary<string, GenericTypeCode>();
XmlAttributeOverrides overrides = new XmlAttributeOverrides();
foreach (var type in serializerTypes)
{
var xmlTypeDefined = Attribute.IsDefined(type, typeof(XmlTypeAttribute), false);
var attributes = new XmlAttributes();
attributes.XmlType = xmlTypeDefined
? (XmlTypeAttribute)Attribute.GetCustomAttribute(type, typeof(XmlTypeAttribute))
: new XmlTypeAttribute();
if (type.IsGenericType)
{
var typeRef = new CodeTypeReference(type);
var typeCode = GenericTypeCode.FromType(type);
var genericSeparatorIndex = type.Name.LastIndexOf('`');
if (xmlTypeDefined && !string.IsNullOrEmpty(attributes.XmlType.TypeName))
{
typeRef.BaseType = type.Namespace + "." + attributes.XmlType.TypeName + type.Name.Substring(genericSeparatorIndex);
typeCode.Name = attributes.XmlType.TypeName;
}
var typeName = codeProvider.GetTypeOutput(typeRef);
genericTypeCache.Add(typeName, typeCode);
attributes.XmlType.TypeName = typeName;
}
attributes.XmlType.Namespace = GetXmlNamespace(type);
overrides.Add(type, attributes);
}
var extraTypes = serializerTypes.Concat(SerializerExtraTypes).Concat(SerializerLegacyTypes).ToArray();
AddTypeAttributeOverrides(overrides, SerializerLegacyTypes);
var rootAttribute = new XmlRootAttribute(WorkflowNodeName) { Namespace = Constants.XmlNamespace };
serializerCache = new XmlSerializer(typeof(ExpressionBuilderGraphDescriptor), overrides, extraTypes, rootAttribute, null);
}
genericTypes = genericTypeCache;
return serializerCache;
}
}
static IEnumerable<object> GetWorkflowElements(ExpressionBuilder builder)
{
yield return builder;
var element = ExpressionBuilder.GetWorkflowElement(builder);
if (element != builder) yield return element;
if (element is WorkflowExpressionBuilder workflowBuilder)
{
foreach (var nestedElement in workflowBuilder.Workflow.SelectMany(node => GetWorkflowElements(node.Value)))
{
yield return nestedElement;
}
}
if (element is ISerializableElement serializableElement && (element = serializableElement.Element) != null)
{
yield return element;
}
}
static IEnumerable<Type> GetExtensionTypes(ExpressionBuilderGraph workflow)
{
return workflow.SelectMany(node => GetWorkflowElements(node.Value))
.Select(element => element.GetType())
.Except(SerializerExtraTypes)
.Except(SerializerLegacyTypes);
}
static void AddExtensionType(HashSet<Type> types, Type type)
{
if (types.Add(type))
{
// resolve any extra include types
var xmlInclude = (XmlIncludeAttribute[])type.GetCustomAttributes(typeof(XmlIncludeAttribute), inherit: true);
for (int i = 0; i < xmlInclude.Length; i++)
{
types.Add(xmlInclude[i].Type);
}
}
}
#endregion
#region UnknownTypeResolver
static readonly UnknownTypeResolver TypeResolver = new UnknownTypeResolver();
static readonly object typeResolverLock = new object();
class UnknownTypeResolver
{
readonly Dictionary<string, AssemblyBuilder> dynamicAssemblies = new Dictionary<string, AssemblyBuilder>();
readonly Dictionary<string, ModuleBuilder> dynamicModules = new Dictionary<string, ModuleBuilder>();
readonly Dictionary<string, Type> dynamicTypes = new Dictionary<string, Type>();
AssemblyBuilder GetDynamicAssembly(string name)
{
if (!dynamicAssemblies.TryGetValue(name, out AssemblyBuilder assemblyBuilder))
{
var assemblyName = new AssemblyName(DynamicAssemblyPrefix + name);
assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
dynamicAssemblies.Add(name, assemblyBuilder);
}
return assemblyBuilder;
}
public Assembly ResolveAssembly(AssemblyName assemblyName)
{
try { return ClrNamespace.ResolveAssembly(assemblyName); }
catch (SystemException ex)
{
if (ex is IOException || ex is BadImageFormatException)
{
return GetDynamicAssembly(assemblyName.FullName);
}
throw;
}
}
public Type ResolveType(Assembly assembly, string typeName, bool ignoreCase)
{
Type type;
string message = Resources.Exception_UnknownTypeBuilder;
try { type = assembly.GetType(typeName, false, ignoreCase); }
catch (SystemException ex)
{
if (ex is IOException || ex is BadImageFormatException || ex is TypeLoadException)
{
message = string.Join(" ", Resources.Exception_TypeLoadException, ex.Message);
type = null;
}
else throw;
}
if (type == null)
{
var assemblyBuilder = assembly as AssemblyBuilder;
if (assemblyBuilder == null)
{
assemblyBuilder = GetDynamicAssembly(assembly.FullName);
}
if (!dynamicTypes.TryGetValue(typeName, out type))
{
if (!dynamicModules.TryGetValue(assembly.FullName, out ModuleBuilder moduleBuilder))
{
moduleBuilder = assemblyBuilder.DefineDynamicModule(assembly.FullName);
dynamicModules.Add(assembly.FullName, moduleBuilder);
}
var typeBuilder = moduleBuilder.DefineType(
typeName,
TypeAttributes.Public | TypeAttributes.Class,
typeof(UnknownTypeBuilder));
var errorMessage = string.Format(message, typeBuilder.FullName);
var descriptionAttributeConstructor = typeof(DescriptionAttribute).GetConstructor(new[] { typeof(string) });
var descriptionAttributeBuilder = new CustomAttributeBuilder(descriptionAttributeConstructor, new[] { errorMessage });
var obsoleteAttributeConstructor = typeof(ObsoleteAttribute).GetConstructor(Type.EmptyTypes);
var obsoleteAttributeBuilder = new CustomAttributeBuilder(obsoleteAttributeConstructor, new object[0]);
typeBuilder.SetCustomAttribute(descriptionAttributeBuilder);
typeBuilder.SetCustomAttribute(obsoleteAttributeBuilder);
type = typeBuilder.CreateTypeInfo();
dynamicTypes.Add(typeName, type);
}
}
return type;
}
}
#endregion
#region ConvertDescriptorMarkup
static readonly Lazy<XslCompiledTransform> descriptorXslt = new Lazy<XslCompiledTransform>(() =>
{
const string XsltMarkup = @"
<xsl:stylesheet version=""1.0""
xmlns:xsl=""http://www.w3.org/1999/XSL/Transform""
xmlns:bonsai=""https://horizongir.org/bonsai""
exclude-result-prefixes=""bonsai"">
<xsl:output method=""xml"" indent=""yes""/>
<xsl:variable name=""uri"" select=""'https://bonsai-rx.org/2018/workflow'""/>
<xsl:template match=""@* | node()"">
<xsl:copy>
<xsl:apply-templates select=""@* | node()""/>
</xsl:copy>
</xsl:template>
<xsl:template match=""bonsai:*"">
<xsl:element name=""{local-name()}"" namespace=""{$uri}"">
<xsl:copy-of select=""namespace::*[local-name() != '']""/>
<xsl:apply-templates select=""@* | node()""/>
</xsl:element>
</xsl:template>
<xsl:template match=""@bonsai:*"">
<xsl:attribute name=""{local-name()}"" namespace=""{$uri}"">
<xsl:value-of select="".""/>
</xsl:attribute>
</xsl:template>
<xsl:template match=""bonsai:PropertyMappings/bonsai:Property"">
<xsl:element name=""Property"" namespace=""{$uri}"">
<xsl:attribute name=""Name"">
<xsl:value-of select=""@name""/>
</xsl:attribute>
<xsl:if test=""@selector"">
<xsl:attribute name=""Selector"">
<xsl:value-of select=""@selector""/>
</xsl:attribute>
</xsl:if>
</xsl:element>
</xsl:template>
<xsl:template match=""bonsai:Workflow/bonsai:Edges/bonsai:Edge"">
<xsl:element name=""Edge"" namespace=""{$uri}"">
<xsl:attribute name=""From"">
<xsl:value-of select=""bonsai:From""/>
</xsl:attribute>
<xsl:attribute name=""To"">
<xsl:value-of select=""bonsai:To""/>
</xsl:attribute>
<xsl:attribute name=""Label"">
<xsl:value-of select=""bonsai:Label""/>
</xsl:attribute>
</xsl:element>
</xsl:template>
</xsl:stylesheet>";
var xslt = new XslCompiledTransform();
using (var reader = XmlReader.Create(new StringReader(XsltMarkup)))
{
xslt.Load(reader);
}
return xslt;
});
static string ConvertDescriptorMarkup(string workflowMarkup)
{
using (var reader = new StringReader(workflowMarkup))
using (var xmlReader = XmlReader.Create(reader))
{
var xslt = descriptorXslt.Value;
using (var writer = new StringWriter())
using (var xmlWriter = XmlWriter.Create(writer, xslt.OutputSettings))
{
xslt.Transform(xmlReader, xmlWriter);
return writer.ToString();
}
}
}
#endregion
#region ReadXmlExtensions
static readonly Dictionary<string, Type> TypeForwarding = GetDefaultXmlTypeForwarding();
static readonly Dictionary<Type, Type> ProxyTypes = GetDefaultXmlProxyTypes();
static Dictionary<string, Type> GetDefaultXmlTypeForwarding()
{
var builderType = typeof(ExpressionBuilder);
var typeMap = new Dictionary<string, Type>();
var assemblyName = builderType.Assembly.GetName().Name;
foreach (var type in builderType.Assembly.GetTypes().Where(type =>
type.IsGenericType && !type.IsAbstract &&
Attribute.IsDefined(type, typeof(XmlTypeAttribute), false) &&
(!Attribute.IsDefined(type, typeof(ObsoleteAttribute), false) ||
Attribute.IsDefined(type, typeof(ProxyTypeAttribute), false))))
{
var xmlTypeAttribute = (XmlTypeAttribute)Attribute.GetCustomAttribute(type, typeof(XmlTypeAttribute));
if (string.IsNullOrEmpty(xmlTypeAttribute.TypeName)) continue;
var genericArguments = type.GetGenericArguments();
var forwardedTypeName = type.Namespace + "." + xmlTypeAttribute.TypeName + "`" + genericArguments.Length + "," + assemblyName;
typeMap.Add(forwardedTypeName, type);
}
return typeMap;
}
static Dictionary<Type, Type> GetDefaultXmlProxyTypes()
{
var builderType = typeof(ExpressionBuilder);
var typeMap = new Dictionary<Type, Type>();
var assemblyName = builderType.Assembly.GetName().Name;
foreach (var type in builderType.Assembly.GetTypes().Where(type =>
Attribute.IsDefined(type, typeof(ProxyTypeAttribute), false)))
{
var proxyTypeAttribute = (ProxyTypeAttribute)Attribute.GetCustomAttribute(type, typeof(ProxyTypeAttribute));
if (proxyTypeAttribute.Destination == null) continue;
typeMap.Add(type, proxyTypeAttribute.Destination);
}
return typeMap;
}
static string Split(string value, char separator, out string prefix)
{
var index = value.IndexOf(separator);
return Split(value, index, 1, out prefix);
}
static string Split(string value, int index, int offset, out string prefix)
{
if (index >= 0)
{
prefix = value.Substring(0, index);
return value.Substring(index + offset);
}
else
{
prefix = string.Empty;
return value;
}
}
struct GenericTypeToken
{
public string Token;
public List<Type> TypeArguments;
}
static Type[] ParseTypeArguments(XmlReader reader, string value)
{
var i = 0;
var builder = new StringBuilder(value.Length);
var typeArguments = new List<Type>();
var stack = new Stack<GenericTypeToken>();
bool hasNext;
do
{
hasNext = i < value.Length;
var c = hasNext ? value[i++] : ',';
switch (c)
{
case '(':
GenericTypeToken genericType;
genericType.Token = builder.ToString();
genericType.TypeArguments = typeArguments;
typeArguments = new List<Type>();
stack.Push(genericType);
builder.Clear();
break;
case ',':
case ')':
if (builder.Length > 0)
{
var token = builder.ToString();
var type = LookupType(reader, token);
typeArguments.Add(type);
builder.Clear();
}
if (c == ')')
{
var baseType = stack.Pop();
var type = LookupType(reader, baseType.Token, typeArguments.ToArray());
typeArguments = baseType.TypeArguments;
typeArguments.Add(type);
}
break;
default:
builder.Append(c);
break;
}
}
while (hasNext);
return typeArguments.ToArray();
}
static Type LookupType(XmlReader reader, string name, params Type[] typeArguments)
{
name = ResolveTypeName(reader, name, out ClrNamespace clrNamespace);
return LookupType(name, clrNamespace, typeArguments);
}
static Type LookupType(string name, ClrNamespace clrNamespace, params Type[] typeArguments)
{
if (typeArguments != null && typeArguments.Length > 0)
{
name = name + '`' + typeArguments.Length;
}
var typeName = clrNamespace.GetAssemblyQualifiedName(name);
return LookupType(typeName, typeArguments);
}
static Type LookupType(string typeName, params Type[] typeArguments)
{
var type = default(Type);
try
{
if (!TypeForwarding.TryGetValue(typeName, out type))
{
type = Type.GetType(typeName, ClrNamespace.ResolveAssembly, null, false);
}
}
catch (IOException) { }
catch (BadImageFormatException) { }
catch (TypeLoadException) { }
if (type == null)
{
lock (typeResolverLock)
{
type = Type.GetType(typeName, TypeResolver.ResolveAssembly, TypeResolver.ResolveType, true);
}
}
return type.IsGenericTypeDefinition ? type.MakeGenericType(typeArguments) : type;
}
static string ResolveTypeName(XmlReader reader, string value, out ClrNamespace clrNamespace)
{
var name = Split(value, ':', out string prefix);
var ns = reader.LookupNamespace(prefix);
if (ns == Constants.XmlNamespace) clrNamespace = ClrNamespace.Default;
else clrNamespace = ClrNamespace.FromUri(ns);
return name;
}
static Type ResolveXmlExtension(XmlReader reader, string value, string typeArguments)
{
var name = ResolveTypeName(reader, value, out ClrNamespace clrNamespace);
if (clrNamespace != ClrNamespace.Default || !string.IsNullOrEmpty(typeArguments))
{
Type[] genericArguments = null;
if (!string.IsNullOrEmpty(typeArguments))
{
genericArguments = ParseTypeArguments(reader, typeArguments);
}
return LookupType(name, clrNamespace, genericArguments);
}
return null;
}
static void WriteXmlAttributes(XmlReader reader, XmlWriter writer, bool lookupTypes, HashSet<Type> types, SerializerNamespaces namespaces, ref bool includeWorkflow)
{
do
{
if (!reader.IsDefault && (!lookupTypes || reader.LocalName != TypeArgumentsAttributeName))
{
var xsiType = string.Empty;
var ns = reader.NamespaceURI;
writer.WriteStartAttribute(reader.Prefix, reader.LocalName, ns);
while (reader.ReadAttributeValue())
{
if (reader.NodeType == XmlNodeType.EntityReference)
{
writer.WriteEntityRef(reader.Name);
}
else
{
var value = reader.Value;
if (ns == XmlSchema.InstanceNamespace)
{
xsiType = value;
}
// ensure xsi:type attributes are resolved only for workflow element types
if (!string.IsNullOrEmpty(xsiType) && lookupTypes && !includeWorkflow)
{
// ensure xsi:type attributes nested inside include workflow properties are ignored
includeWorkflow = value == IncludeWorkflowTypeName;
var typeArguments = reader.GetAttribute(TypeArgumentsAttributeName);
var type = ResolveXmlExtension(reader, value, typeArguments);
if (type != null)
{
// resolve any xsi:type proxy types
if (ProxyTypes.TryGetValue(type, out Type proxyType))
{
var proxyNamespace = GetXmlNamespace(proxyType);
var proxyPrefix = namespaces.FirstOrDefault(name => name.Namespace == proxyNamespace);
if (proxyPrefix != null)
{
value = $"{proxyPrefix.Name}:{proxyType.Name}";
type = proxyType;
}
}
AddExtensionType(types, type);
if (!string.IsNullOrEmpty(typeArguments))
{
var typeRef = new CodeTypeReference(type);
var genericSeparatorIndex = type.Name.LastIndexOf('`');
if (value.Length != genericSeparatorIndex)
{
// fast comparison for clipping internal type suffixes only, e.g. `1
// if present, also include element namespace prefix
var typeNameIndex = value.IndexOf(':') + 1;
var prefix = value.Substring(0, typeNameIndex);
value = value.Substring(typeNameIndex);
var typeSuffix = type.Name.Substring(genericSeparatorIndex);
typeRef.BaseType = prefix + type.Namespace + "." + value + typeSuffix;
}
var typeName = codeProvider.GetTypeOutput(typeRef);
value = XmlConvert.EncodeName(typeName);
}
}
}
writer.WriteString(value);
}
}
writer.WriteEndAttribute();
if (!string.IsNullOrEmpty(xsiType) && includeWorkflow)
{
xsiType = Split(xsiType, ':', out ns);
if (!string.IsNullOrEmpty(ns) && reader.GetAttribute("xmlns" + ":" + ns) == null)
{
var qname = namespaces.FirstOrDefault(q => q.Name == ns);
if (qname != null)
{
writer.WriteAttributeString("xmlns", qname.Name, null, qname.Namespace);
}
}
}
}
}
while (reader.MoveToNextAttribute());
}
static string ReadXmlExtensions(XmlReader reader, HashSet<Type> types, SerializerNamespaces namespaces)
{
const int ChunkBufferSize = 1024;
char[] chunkBuffer = null;
var includeDepth = -1;
var serializerNamespaces = namespaces;
var canReadChunk = reader.CanReadValueChunk;
var depth = reader.NodeType == XmlNodeType.None ? -1 : reader.Depth;
var sw = new StringWriter(CultureInfo.InvariantCulture);
using (var writer = XmlWriter.Create(sw))
{
do
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
var elementNamespace = reader.NamespaceURI;
writer.WriteStartElement(reader.Prefix, reader.LocalName, elementNamespace);
if (namespaces != null)
{
foreach (var qname in namespaces)
{
writer.WriteAttributeString("xmlns", qname.Name, null, qname.Namespace);
}
namespaces = null;
}
if (reader.MoveToFirstAttribute())
{
var includeWorkflow = includeDepth >= 0;
var lookupTypes = elementNamespace == Constants.XmlNamespace;
WriteXmlAttributes(reader, writer, lookupTypes, types, serializerNamespaces, ref includeWorkflow);
reader.MoveToElement();
if (lookupTypes && includeDepth < 0 && includeWorkflow)
{
includeDepth = reader.Depth;
}
}
if (reader.IsEmptyElement)
{
if (includeDepth >= 0 && reader.Depth <= includeDepth) includeDepth = -1;
writer.WriteEndElement();
}
break;
case XmlNodeType.Text:
if (canReadChunk)
{
int chunkSize;
if (chunkBuffer == null) chunkBuffer = new char[ChunkBufferSize];
while ((chunkSize = reader.ReadValueChunk(chunkBuffer, 0, ChunkBufferSize)) > 0)
{
writer.WriteChars(chunkBuffer, 0, chunkSize);
}
}
else writer.WriteString(reader.Value);
break;
case XmlNodeType.CDATA:
writer.WriteCData(reader.Value);
break;
case XmlNodeType.Comment:
writer.WriteComment(reader.Value);
break;
case XmlNodeType.EndElement:
if (includeDepth >= 0 && reader.Depth <= includeDepth) includeDepth = -1;
writer.WriteFullEndElement();
break;
case XmlNodeType.EntityReference:
writer.WriteEntityRef(reader.Name);
break;
case XmlNodeType.Whitespace:
case XmlNodeType.SignificantWhitespace:
writer.WriteWhitespace(reader.Value);
break;
case XmlNodeType.XmlDeclaration:
case XmlNodeType.ProcessingInstruction:
writer.WriteProcessingInstruction(reader.Name, reader.Value);
break;
}
}
while (reader.Read() && (depth < reader.Depth || (depth == reader.Depth && reader.NodeType == XmlNodeType.EndElement)));
}
return sw.ToString();
}
#endregion
#region XmlExtensionWriter
class GenericTypeCode
{
public string Name;
public string Namespace;
public GenericTypeCode[] TypeArguments;
static readonly GenericTypeCode[] EmptyTypes = new GenericTypeCode[0];
public static GenericTypeCode FromType(Type type)
{
var code = new GenericTypeCode();
code.Name = type.Name;
code.Namespace = GetXmlNamespace(type);