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// Licensed under the MIT License.
using System;
using System.IO;
using System.Management.Automation;
using System.Xml;
using Dbg = System.Management.Automation.Diagnostics;
namespace Microsoft.PowerShell
{
/// <summary>
/// Wraps Hitesh's xml serializer in such a way that it will select the proper serializer based on the data
/// format.
/// </summary>
internal class Serialization
{
/// <summary>
/// Describes the format of the data streamed between minishells, e.g. the allowed arguments to the minishell
/// -outputformat and -inputformat command line parameters.
/// </summary>
internal enum DataFormat
{
/// <summary>
/// Text format -- i.e. stream text just as out-default would display it.
/// </summary>
Text = 0,
/// <summary>
/// XML-serialized format.
/// </summary>
XML = 1,
/// <summary>
/// Indicates that the data should be discarded instead of processed.
/// </summary>
None = 2
}
protected
Serialization(DataFormat dataFormat, string streamName)
{
Dbg.Assert(!string.IsNullOrEmpty(streamName), "stream needs a name");
format = dataFormat;
this.streamName = streamName;
}
protected static string XmlCliTag = "#< CLIXML";
protected string streamName;
protected DataFormat format;
}
internal
class WrappedSerializer : Serialization
{
internal
WrappedSerializer(DataFormat dataFormat, string streamName, TextWriter output)
: base(dataFormat, streamName)
{
Dbg.Assert(output != null, "output should have a value");
textWriter = output;
switch (format)
{
case DataFormat.XML:
XmlWriterSettings settings = new XmlWriterSettings();
settings.CheckCharacters = false;
settings.OmitXmlDeclaration = true;
_xmlWriter = XmlWriter.Create(textWriter, settings);
_xmlSerializer = new Serializer(_xmlWriter);
break;
case DataFormat.Text:
default:
// do nothing; we'll just write to the TextWriter
// or discard it.
break;
}
}
internal
void
Serialize(object o)
{
Serialize(o, this.streamName);
}
internal
void
Serialize(object o, string streamName)
{
switch (format)
{
case DataFormat.None:
break;
case DataFormat.XML:
if (_firstCall)
{
_firstCall = false;
textWriter.WriteLine(Serialization.XmlCliTag);
}
_xmlSerializer.Serialize(o, streamName);
break;
case DataFormat.Text:
default:
textWriter.Write(o.ToString());
break;
}
}
internal
void
End()
{
switch (format)
{
case DataFormat.None:
// do nothing
break;
case DataFormat.XML:
_xmlSerializer.Done();
_xmlSerializer = null;
break;
case DataFormat.Text:
default:
// do nothing
break;
}
}
internal TextWriter textWriter;
private readonly XmlWriter _xmlWriter;
private Serializer _xmlSerializer;
private bool _firstCall = true;
}
internal
class WrappedDeserializer : Serialization
{
internal
WrappedDeserializer(DataFormat dataFormat, string streamName, TextReader input)
: base(dataFormat, streamName)
{
Dbg.Assert(input != null, "input should have a value");
// If the data format is none - do nothing...
if (dataFormat == DataFormat.None)
return;
textReader = input;
_firstLine = textReader.ReadLine();
if (string.Equals(_firstLine, Serialization.XmlCliTag, StringComparison.OrdinalIgnoreCase))
{
// format should be XML
dataFormat = DataFormat.XML;
}
switch (format)
{
case DataFormat.XML:
_xmlReader = XmlReader.Create(textReader, new XmlReaderSettings { XmlResolver = null });
_xmlDeserializer = new Deserializer(_xmlReader);
break;
case DataFormat.Text:
default:
// do nothing; we'll just read from the TextReader
break;
}
}
internal
object
Deserialize()
{
object o;
switch (format)
{
case DataFormat.None:
_atEnd = true;
return null;
case DataFormat.XML:
o = _xmlDeserializer.Deserialize(out _);
break;
case DataFormat.Text:
default:
if (_atEnd)
{
return null;
}
if (_firstLine != null)
{
o = _firstLine;
_firstLine = null;
}
else
{
o = textReader.ReadLine();
if (o == null)
{
_atEnd = true;
}
}
break;
}
return o;
}
internal
bool
AtEnd
{
get
{
bool result = false;
switch (format)
{
case DataFormat.None:
_atEnd = true;
result = true;
break;
case DataFormat.XML:
result = _xmlDeserializer.Done();
break;
case DataFormat.Text:
default:
result = _atEnd;
break;
}
return result;
}
}
internal
void
End()
{
switch (format)
{
case DataFormat.None:
case DataFormat.XML:
case DataFormat.Text:
default:
// do nothing
break;
}
}
internal TextReader textReader;
private readonly XmlReader _xmlReader;
private readonly Deserializer _xmlDeserializer;
private string _firstLine;
private bool _atEnd;
}
} // namespace
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