1 files changed, 226 insertions, 0 deletions
diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Xml/AXmlElement.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Xml/AXmlElement.cs
new file mode 100644
index 000000000..080d538e8
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+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Xml/AXmlElement.cs
@@ -0,0 +1,226 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+using System.Diagnostics;
+using System.Globalization;
+using System.Linq;
+
+using Tango.Scripting.Editors.Document;
+
+namespace Tango.Scripting.Editors.Xml
+{
+	/// <summary>
+	/// Logical grouping of other nodes together.
+	/// </summary>
+	public class AXmlElement: AXmlContainer
+	{
+		/// <summary> No tags are missing anywhere within this element (recursive) </summary>
+		public bool IsProperlyNested { get; set; }
+		/// <returns> True in wellformed XML </returns>
+		public bool HasStartOrEmptyTag { get; set; }
+		/// <returns> True in wellformed XML </returns>
+		public bool HasEndTag { get; set; }
+		
+		/// <inheritdoc/>
+		internal override bool UpdateDataFrom(AXmlObject source)
+		{
+			if (!base.UpdateDataFrom(source)) return false;
+			AXmlElement src = (AXmlElement)source;
+			// Clear the cache for this - quite expensive
+			attributesAndElements = null;
+			if (this.IsProperlyNested != src.IsProperlyNested ||
+				this.HasStartOrEmptyTag != src.HasStartOrEmptyTag ||
+				this.HasEndTag != src.HasEndTag)
+			{
+				OnChanging();
+				this.IsProperlyNested = src.IsProperlyNested;
+				this.HasStartOrEmptyTag = src.HasStartOrEmptyTag;
+				this.HasEndTag = src.HasEndTag;
+				OnChanged();
+				return true;
+			} else {
+				return false;
+			}
+		}
+		
+		/// <summary> The start or empty-element tag if there is any </summary>
+		internal AXmlTag StartTag {
+			get {
+				Assert(HasStartOrEmptyTag, "Does not have a start tag");
+				return (AXmlTag)this.Children[0];
+			}
+		}
+		
+		/// <summary> The end tag if there is any </summary>
+		internal AXmlTag EndTag {
+			get {
+				Assert(HasEndTag, "Does not have an end tag");
+				return (AXmlTag)this.Children[this.Children.Count - 1];
+			}
+		}
+		
+		internal override void DebugCheckConsistency(bool checkParentPointers)
+		{
+			DebugAssert(Children.Count > 0, "No children");
+			base.DebugCheckConsistency(checkParentPointers);
+		}
+		
+		#region Helpper methods
+		
+		/// <summary> Gets attributes of the element </summary>
+		/// <remarks>
+		/// Warning: this is a cenvenience method to access the attributes of the start tag.
+		/// However, since the start tag might be moved/replaced, this property might return 
+		/// different values over time.
+		/// </remarks>
+		public AXmlAttributeCollection Attributes {
+			get {
+				if (this.HasStartOrEmptyTag) {
+					return this.StartTag.Attributes;
+				} else {
+					return AXmlAttributeCollection.Empty;
+				}
+			}
+		}
+		
+		ObservableCollection<AXmlObject> attributesAndElements;
+		
+		/// <summary> Gets both attributes and elements.  Expensive, avoid use. </summary>
+		/// <remarks> Warning: the collection will regenerate after each update </remarks>
+		public ObservableCollection<AXmlObject> AttributesAndElements {
+			get {
+				if (attributesAndElements == null) {
+					if (this.HasStartOrEmptyTag) {
+						attributesAndElements = new MergedCollection<AXmlObject, ObservableCollection<AXmlObject>> (
+							// New wrapper with RawObject types
+							new FilteredCollection<AXmlObject, AXmlObjectCollection<AXmlObject>>(this.StartTag.Children, x => x is AXmlAttribute),
+							new FilteredCollection<AXmlObject, AXmlObjectCollection<AXmlObject>>(this.Children, x => x is AXmlElement)
+						);
+					} else {
+						attributesAndElements = new FilteredCollection<AXmlObject, AXmlObjectCollection<AXmlObject>>(this.Children, x => x is AXmlElement);
+					}
+				}
+				return attributesAndElements;
+			}
+		}
+		
+		/// <summary> Name with namespace prefix - exactly as in source </summary>
+		public string Name {
+			get {
+				if (this.HasStartOrEmptyTag) {
+					return this.StartTag.Name;
+				} else {
+					return this.EndTag.Name;
+				}
+			}
+		}
+		
+		/// <summary> The part of name before ":" </summary>
+		/// <returns> Empty string if not found </returns>
+		public string Prefix {
+			get {
+				return GetNamespacePrefix(this.Name);
+			}
+		}
+		
+		/// <summary> The part of name after ":" </summary>
+		/// <returns> Empty string if not found </returns>
+		public string LocalName {
+			get {
+				return GetLocalName(this.Name);
+			}
+		}
+		
+		/// <summary> Resolved namespace of the name </summary>
+		/// <returns> Empty string if prefix is not found </returns>
+		public string Namespace {
+			get {
+				string prefix = this.Prefix;
+				if (string.IsNullOrEmpty(prefix)) {
+					return FindDefaultNamespace();
+				} else {
+					return ResolvePrefix(prefix);
+				}
+			}
+		}
+		
+		/// <summary> Find the defualt namespace for this context </summary>
+		public string FindDefaultNamespace()
+		{
+			AXmlElement current = this;
+			while(current != null) {
+				string namesapce = current.GetAttributeValue(NoNamespace, "xmlns");
+				if (namesapce != null) return namesapce;
+				current = current.Parent as AXmlElement;
+			}
+			return string.Empty; // No namesapce
+		}
+		
+		/// <summary>
+		/// Recursively resolve given prefix in this context.  Prefix must have some value.
+		/// </summary>
+		/// <returns> Empty string if prefix is not found </returns>
+		public string ResolvePrefix(string prefix)
+		{
+			if (string.IsNullOrEmpty(prefix)) throw new ArgumentException("No prefix given", "prefix");
+			
+			// Implicit namesapces
+			if (prefix == "xml") return XmlNamespace;
+			if (prefix == "xmlns") return XmlnsNamespace;
+			
+			AXmlElement current = this;
+			while(current != null) {
+				string namesapce = current.GetAttributeValue(XmlnsNamespace, prefix);
+				if (namesapce != null) return namesapce;
+				current = current.Parent as AXmlElement;
+			}
+			return NoNamespace; // Can not find prefix
+		}
+		
+		/// <summary>
+		/// Get unquoted value of attribute.
+		/// It looks in the no namespace (empty string).
+		/// </summary>
+		/// <returns>Null if not found</returns>
+		public string GetAttributeValue(string localName)
+		{
+			return GetAttributeValue(NoNamespace, localName);
+		}
+		
+		/// <summary>
+		/// Get unquoted value of attribute
+		/// </summary>
+		/// <param name="namespace">Namespace.  Can be no namepace (empty string), which is the default for attributes.</param>
+		/// <param name="localName">Local name - text after ":"</param>
+		/// <returns>Null if not found</returns>
+		public string GetAttributeValue(string @namespace, string localName)
+		{
+			@namespace = @namespace ?? string.Empty;
+			foreach(AXmlAttribute attr in this.Attributes.GetByLocalName(localName)) {
+				DebugAssert(attr.LocalName == localName, "Bad hashtable");
+				if (attr.Namespace == @namespace) {
+					return attr.Value;
+				}
+			}
+			return null;
+		}
+		
+		#endregion
+		
+		/// <inheritdoc/>
+		public override void AcceptVisitor(IAXmlVisitor visitor)
+		{
+			visitor.VisitElement(this);
+		}
+		
+		/// <inheritdoc/>
+		public override string ToString()
+		{
+			return string.Format(CultureInfo.InvariantCulture, "[{0} '{1}' Attr:{2} Chld:{3} Nest:{4}]", base.ToString(), this.Name, this.HasStartOrEmptyTag ? this.StartTag.Children.Count : 0, this.Children.Count, this.IsProperlyNested ? "Ok" : "Bad");
+		}
+	}
+}