//
// Mono.Xml.XmlNodeWriter
//
// Author:
// Atsushi Enomoto (ginga@kit.hi-ho.ne.jp)
//
// (C)2003 Atsushi Enomoto
//
//
// 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.Xml;
namespace System.Xml{
internal class XmlNodeWriter : XmlWriter
{
public XmlNodeWriter () : this (true)
{
}
// It should be public after some tests are done :-)
public XmlNodeWriter (bool isDocumentEntity)
{
doc = new XmlDocument ();
state = XmlNodeType.None;
this.isDocumentEntity = isDocumentEntity;
if (!isDocumentEntity)
current = fragment = doc.CreateDocumentFragment ();
}
XmlDocument doc;
bool isClosed;
// If it is not null, then we are now inside the element.
XmlNode current;
// If it is not null, then we are now inside the attribute.
XmlAttribute attribute;
// If it is false, then allow to contain multiple document elements.
bool isDocumentEntity;
XmlDocumentFragment fragment;
// None: started or closed.
// XmlDeclaration: after xmldecl. Never allow xmldecl.
// DocumentType: after doctype. Never allow xmldecl and doctype.
// Element: inside document element.
//
XmlNodeType state;
// Properties
public XmlNode Document {
get { return isDocumentEntity ? (XmlNode)doc : (XmlNode)fragment; }
}
public XmlNode Current {
get { return current; }
}
public override WriteState WriteState {
get {
if (isClosed)
return WriteState.Closed;
if (attribute != null)
return WriteState.Attribute;
switch (state) {
case XmlNodeType.None:
return WriteState.Start;
case XmlNodeType.XmlDeclaration:
return WriteState.Prolog;
case XmlNodeType.DocumentType:
return WriteState.Element;
default:
return WriteState.Content;
}
}
}
public override string XmlLang {
get {
for (XmlElement n = current as XmlElement; n != null; n = n.ParentNode as XmlElement)
if (n.HasAttribute ("xml:lang"))
return n.GetAttribute ("xml:lang");
return String.Empty;
}
}
public override XmlSpace XmlSpace {
get {
for (XmlElement n = current as XmlElement; n != null; n = n.ParentNode as XmlElement) {
string xs = n.GetAttribute ("xml:space");
switch (xs) {
case "preserve":
return XmlSpace.Preserve;
case "default":
return XmlSpace.Default;
case "":
continue;
default:
throw new InvalidOperationException (String.Format ("Invalid xml:space {0}.", xs));
}
}
return XmlSpace.None;
}
}
// Private Methods
private void CheckState ()
{
if (isClosed)
throw new InvalidOperationException ();
}
private void WritePossiblyTopLevelNode (XmlNode n, bool possiblyAttribute)
{
CheckState ();
if (!possiblyAttribute && attribute != null)
throw new InvalidOperationException (String.Format ("Current state is not acceptable for {0}.", n.NodeType));
if (state != XmlNodeType.Element)
Document.AppendChild (n);
else if (attribute != null)
attribute.AppendChild (n);
else
current.AppendChild (n);
if (state == XmlNodeType.None)
state = XmlNodeType.XmlDeclaration;
}
// Public Methods
public override void Close ()
{
CheckState ();
isClosed = true;
}
public override void Flush ()
{
}
public override string LookupPrefix (string ns)
{
CheckState ();
if (current == null)
throw new InvalidOperationException ();
return current.GetPrefixOfNamespace (ns);
}
// StartDocument
public override void WriteStartDocument ()
{
WriteStartDocument (null);
}
public override void WriteStartDocument (bool standalone)
{
WriteStartDocument (standalone ? "yes" : "no");
}
private void WriteStartDocument (string sddecl)
{
CheckState ();
if (state != XmlNodeType.None)
throw new InvalidOperationException ("Current state is not acceptable for xmldecl.");
doc.AppendChild (doc.CreateXmlDeclaration ("1.0", null, sddecl));
state = XmlNodeType.XmlDeclaration;
}
// EndDocument
public override void WriteEndDocument ()
{
CheckState ();
isClosed = true;
}
// DocumentType
public override void WriteDocType (string name, string publicId, string systemId, string internalSubset)
{
CheckState ();
switch (state) {
case XmlNodeType.None:
case XmlNodeType.XmlDeclaration:
doc.AppendChild (doc.CreateDocumentType (name, publicId, systemId, internalSubset));
state = XmlNodeType.DocumentType;
break;
default:
throw new InvalidOperationException ("Current state is not acceptable for doctype.");
}
}
// StartElement
public override void WriteStartElement (string prefix, string name, string ns)
{
CheckState ();
if (isDocumentEntity && state == XmlNodeType.EndElement && doc.DocumentElement != null)
throw new InvalidOperationException ("Current state is not acceptable for startElement.");
XmlElement el = doc.CreateElement (prefix, name, ns);
if (current == null) {
Document.AppendChild (el);
state = XmlNodeType.Element;
} else {
current.AppendChild (el);
state = XmlNodeType.Element;
}
current = el;
}
// EndElement
public override void WriteEndElement ()
{
WriteEndElementInternal (false);
}
public override void WriteFullEndElement ()
{
WriteEndElementInternal (true);
}
private void WriteEndElementInternal (bool forceFull)
{
CheckState ();
if (current == null)
throw new InvalidOperationException ("Current state is not acceptable for endElement.");
if (!forceFull && current.FirstChild == null)
((XmlElement) current).IsEmpty = true;
if (isDocumentEntity && current.ParentNode == doc)
state = XmlNodeType.EndElement;
else
current = current.ParentNode;
}
// StartAttribute
public override void WriteStartAttribute (string prefix, string name, string ns)
{
CheckState ();
if (attribute != null)
throw new InvalidOperationException ("There is an open attribute.");
if (!(current is XmlElement))
throw new InvalidOperationException ("Current state is not acceptable for startAttribute.");
attribute = doc.CreateAttribute (prefix, name, ns);
((XmlElement)current).SetAttributeNode (attribute);
}
public override void WriteEndAttribute ()
{
CheckState ();
if (attribute == null)
throw new InvalidOperationException ("Current state is not acceptable for startAttribute.");
attribute = null;
}
public override void WriteCData (string data)
{
CheckState ();
if (current == null)
throw new InvalidOperationException ("Current state is not acceptable for CDATAsection.");
current.AppendChild (doc.CreateCDataSection (data));
}
public override void WriteComment (string comment)
{
WritePossiblyTopLevelNode (doc.CreateComment (comment), false);
}
public override void WriteProcessingInstruction (string name, string value)
{
WritePossiblyTopLevelNode (
doc.CreateProcessingInstruction (name, value), false);
}
public override void WriteEntityRef (string name)
{
WritePossiblyTopLevelNode (doc.CreateEntityReference (name), true);
}
public override void WriteCharEntity (char c)
{
WritePossiblyTopLevelNode (doc.CreateTextNode (new string (new char [] {c}, 0, 1)), true);
}
public override void WriteWhitespace (string ws)
{
WritePossiblyTopLevelNode (doc.CreateWhitespace (ws), true);
}
public override void WriteString (string data)
{
CheckState ();
if (current == null)
throw new InvalidOperationException ("Current state is not acceptable for Text.");
if (attribute != null)
attribute.AppendChild (doc.CreateTextNode (data));
else {
XmlText last = current.LastChild as XmlText;
if (last == null)
current.AppendChild(doc.CreateTextNode(data));
else
last.AppendData(data);
}
}
public override void WriteName (string name)
{
WriteString (name);
}
public override void WriteNmToken (string nmtoken)
{
WriteString (nmtoken);
}
public override void WriteQualifiedName (string name, string ns)
{
string prefix = LookupPrefix (ns);
if (prefix == null)
throw new ArgumentException (String.Format ("Invalid namespace {0}", ns));
if (prefix != String.Empty)
WriteString (name);
else
WriteString (prefix + ":" + name);
}
public override void WriteChars (char [] chars, int start, int len)
{
WriteString (new string (chars, start, len));
}
public override void WriteRaw (string data)
{
// It never supports raw string.
WriteString (data);
}
public override void WriteRaw (char [] chars, int start, int len)
{
// It never supports raw string.
WriteChars (chars, start, len);
}
public override void WriteBase64 (byte [] data, int start, int len)
{
// It never supports raw string.
WriteString (Convert.ToBase64String (data, start, len));
}
public override void WriteBinHex (byte [] data, int start, int len)
{
throw new NotImplementedException ();
}
public override void WriteSurrogateCharEntity (char c1, char c2)
{
throw new NotImplementedException ();
}
}
}
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