XamlXmlWriter.cs :  » 2.6.4-mono-.net-core » System.Xaml » System » Xaml » C# / CSharp Open Source

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C# / CSharp Open Source » 2.6.4 mono .net core » System.Xaml 
System.Xaml » System » Xaml » XamlXmlWriter.cs
//
// Copyright (C) 2010 Novell Inc. http://novell.com
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Windows.Markup;
using System.Xml;

/*

** Value output node type

When an object contains a member:
- it becomes an attribute when it contains a value.
- it becomes an element when it contains an object.
*/

namespace System.Xaml{
  public class XamlXmlWriter : XamlWriter
  {
    public XamlXmlWriter (Stream stream, XamlSchemaContext schemaContext)
      : this (stream, schemaContext, null)
    {
    }
    
    public XamlXmlWriter (Stream stream, XamlSchemaContext schemaContext, XamlXmlWriterSettings settings)
      : this (XmlWriter.Create (stream), schemaContext, null)
    {
    }
    
    public XamlXmlWriter (TextWriter textWriter, XamlSchemaContext schemaContext)
      : this (XmlWriter.Create (textWriter), schemaContext, null)
    {
    }
    
    public XamlXmlWriter (TextWriter textWriter, XamlSchemaContext schemaContext, XamlXmlWriterSettings settings)
      : this (XmlWriter.Create (textWriter), schemaContext, null)
    {
    }
    
    public XamlXmlWriter (XmlWriter xmlWriter, XamlSchemaContext schemaContext)
      : this (xmlWriter, schemaContext, null)
    {
    }
    
    public XamlXmlWriter (XmlWriter xmlWriter, XamlSchemaContext schemaContext, XamlXmlWriterSettings settings)
    {
      if (xmlWriter == null)
        throw new ArgumentNullException ("xmlWriter");
      if (schemaContext == null)
        throw new ArgumentNullException ("schemaContext");
      this.w = xmlWriter;
      this.sctx = schemaContext;
      this.settings = settings ?? new XamlXmlWriterSettings ();
      this.manager = new XamlWriterStateManager<XamlXmlWriterException, InvalidOperationException> (true);
    }

    XmlWriter w;
    XamlSchemaContext sctx;
    XamlXmlWriterSettings settings;
    IValueSerializerContext serializer_context;

    XamlWriterStateManager manager;

    Stack<object> nodes = new Stack<object> ();
    bool is_first_member_content, has_namespace;
    object first_member_value;

    public override XamlSchemaContext SchemaContext {
      get { return sctx; }
    }

    public XamlXmlWriterSettings Settings {
      get { return settings; }
    }

    protected override void Dispose (bool disposing)
    {
      if (!disposing)
        return;

      while (nodes.Count > 0) {
        var obj = nodes.Peek ();
        if (obj is XamlMember) {
          manager.OnClosingItem ();
          WriteEndMember ();
        }
        else if (obj is XamlType)
          WriteEndObject ();
        else
          nodes.Pop ();
      }
      if (settings.CloseOutput)
        w.Close ();
    }

    public void Flush ()
    {
      w.Flush ();
    }

    public override void WriteEndMember ()
    {
      manager.EndMember ();
      WriteStackedStartMember (XamlNodeType.EndMember);
      DoEndMember ();

    }

    public override void WriteEndObject ()
    {
      manager.EndObject (nodes.Count > 1);
      w.WriteEndElement ();
      nodes.Pop ();
    }

    public override void WriteGetObject ()
    {
      manager.GetObject ();
      WriteStackedStartMember (XamlNodeType.GetObject);

      var xm = (XamlMember) GetNonNamespaceNode ();
      if (!xm.Type.IsCollection)
        throw new InvalidOperationException (String.Format ("WriteGetObject method can be invoked only when current member '{0}' is of collection type", xm.Name));

      DoEndMember ();
      
      // FIXME: it likely has to write the "retrieved" object here.
    }

    public override void WriteNamespace (NamespaceDeclaration namespaceDeclaration)
    {
      if (namespaceDeclaration == null)
        throw new ArgumentNullException ("namespaceDeclaration");

      manager.Namespace ();

      nodes.Push (namespaceDeclaration);
      has_namespace = true;
    }

    public override void WriteStartMember (XamlMember property)
    {
      if (property == null)
        throw new ArgumentNullException ("property");

      manager.StartMember ();
      nodes.Push (property);

      is_first_member_content = true;
    }

    public override void WriteStartObject (XamlType xamlType)
    {
      if (xamlType == null)
        throw new ArgumentNullException ("xamlType");

      manager.StartObject ();

      WriteStackedStartMember (XamlNodeType.StartObject);

      nodes.Push (xamlType);
      DoWriteStartObject (xamlType);
    }
    
    public override void WriteValue (object value)
    {
      manager.Value ();

      var xt = GetCurrentType ();
      
      var xm = GetNonNamespaceNode () as XamlMember;
      if (xm == XamlLanguage.Initialization) {
        // do not reject type mismatch, as the value will be a string.
      }
      else if (xt != null && xt.UnderlyingType != null && !xt.UnderlyingType.IsInstanceOfType (value))
        throw new ArgumentException (String.Format ("Value is not of type {0} but {1}", xt, value != null ? value.GetType ().FullName : "(null)"));

      if (!is_first_member_content) {
        WriteStackedStartMember (XamlNodeType.Value);
        DoWriteValue (value);
      }
      else
        first_member_value = value;
    }

    void DoEndMember ()
    {
      var xm = nodes.Pop (); // XamlMember
      if (xm == XamlLanguage.Initialization)
        ; // do nothing
      else if (w.WriteState == WriteState.Content)
        w.WriteEndElement ();
      else
        w.WriteEndAttribute ();

      is_first_member_content = false;
      first_member_value = null;
    }

    void WriteStackedStartMember (XamlNodeType next)
    {
      if (!is_first_member_content)
        return;

      var xm = GetNonNamespaceNode () as XamlMember;
      if (xm == null)
        return;

      if (xm == XamlLanguage.Initialization)
        ; // do nothing
      else if (next == XamlNodeType.StartObject || w.WriteState == WriteState.Content || has_namespace)
        DoWriteStartMemberElement (xm);
      else
        DoWriteStartMemberAttribute (xm);
      if (first_member_value != null)
        DoWriteValue (first_member_value);
      is_first_member_content = false;
    }

    void DoWriteStartObject (XamlType xamlType)
    {
      string prefix = GetPrefix (xamlType.PreferredXamlNamespace);
      w.WriteStartElement (prefix, xamlType.Name, xamlType.PreferredXamlNamespace);
      WriteAndClearNamespaces ();
    }
    
    void DoWriteStartMemberElement (XamlMember xm)
    {
      var xt = GetCurrentType ();
      string prefix = GetPrefix (xm.PreferredXamlNamespace);
      w.WriteStartElement (prefix, String.Concat (xt.Name, ".", xm.Name), xm.PreferredXamlNamespace);
      WriteAndClearNamespaces ();
    }
    
    void DoWriteStartMemberAttribute (XamlMember xm)
    {
      WriteAndClearNamespaces ();
      
      var xt = GetCurrentType ();
      if (xt.PreferredXamlNamespace == xm.PreferredXamlNamespace)
        w.WriteStartAttribute (xm.Name);
      else {
        string prefix = GetPrefix (xm.PreferredXamlNamespace);
        w.WriteStartAttribute (prefix, xm.Name, xm.PreferredXamlNamespace);
      }
    }

    void DoWriteValue (object value)
    {
      var xt = value == null ? XamlLanguage.Null : SchemaContext.GetXamlType (value.GetType ());
      var vs = xt.TypeConverter;
      var c = vs != null ? vs.ConverterInstance : null;
      if (c != null && c.CanConvertTo (typeof (string)))
        w.WriteString (c.ConvertToInvariantString (value));
      else
        w.WriteValue (value);
    }

    object GetNonNamespaceNode ()
    {
      if (nodes.Count == 0)
        return null;
      var obj = nodes.Pop ();
      try {
        if (obj is NamespaceDeclaration)
          return GetNonNamespaceNode ();
        else
          return obj;
      } finally {
        nodes.Push (obj);
      }
    }

    XamlType GetCurrentType ()
    {
      if (nodes.Count == 0)
        return null;
      var obj = nodes.Pop ();
      try {
        if (obj is XamlType)
          return (XamlType) obj;
        else
          return GetCurrentType ();
      } finally {
        nodes.Push (obj);
      }
    }

    string GetPrefix (string ns)
    {
      var decl = nodes.LastOrDefault (d => d is NamespaceDeclaration && ((NamespaceDeclaration) d).Namespace == ns) as NamespaceDeclaration;
      if (decl != null)
        return decl.Prefix;
      return w.LookupPrefix (ns);
    }

    Stack<NamespaceDeclaration> tmp_nss = new Stack<NamespaceDeclaration> ();

    void WriteAndClearNamespaces ()
    {
      // write namespace that are put *before* current item.

      var top = nodes.Pop (); // temporarily pop out

      while (nodes.Count > 0) {
        var obj = nodes.Pop ();
        var nd = obj as NamespaceDeclaration;
        if (nd == null) {
          nodes.Push (obj);
          break;
        }
        tmp_nss.Push (nd);
      }
      while (tmp_nss.Count > 0) {
        var nd = tmp_nss.Pop ();
        DoWriteNamespace (nd);
      }
      has_namespace = false;
      manager.NamespaceCleanedUp ();

      nodes.Push (top); // push back
    }

    void DoWriteNamespace (NamespaceDeclaration nd)
    {
      if (String.IsNullOrEmpty (nd.Prefix))
        w.WriteAttributeString ("xmlns", nd.Namespace);
      else
        w.WriteAttributeString ("xmlns", nd.Prefix, XamlLanguage.Xmlns2000Namespace, nd.Namespace);
    }
  }
}
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