source: branches/PersistenceOverhaul/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory.Xml-5.5.0/AXmlObject.cs @ 13325

// Copyright (c) 2009-2013 AlphaSierraPapa for the SharpDevelop Team
// 
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// software and associated documentation files (the "Software"), to deal in the Software
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// 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
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml;
using ICSharpCode.NRefactory.Editor;
using ICSharpCode.NRefactory.Utils;

namespace ICSharpCode.NRefactory.Xml
{
  /// <summary>
  /// XML object. Base class for all nodes in the XML document.
  /// </summary>
  public abstract class AXmlObject : ISegment
  {
    /// <summary> Empty string.  The namespace used if there is no "xmlns" specified </summary>
    internal static readonly string NoNamespace = string.Empty;
    
    /// <summary> Namespace for "xml:" prefix: "http://www.w3.org/XML/1998/namespace" </summary>
    public static readonly string XmlNamespace = "http://www.w3.org/XML/1998/namespace";
    
    /// <summary> Namesapce for "xmlns:" prefix: "http://www.w3.org/2000/xmlns/" </summary>
    public static readonly string XmlnsNamespace = "http://www.w3.org/2000/xmlns/";
    
    readonly AXmlObject parent;
    internal readonly int startOffset;
    internal readonly InternalObject internalObject;
    IList<AXmlObject> children;
    
    internal AXmlObject(AXmlObject parent, int startOffset, InternalObject internalObject)
    {
      this.parent = parent;
      this.startOffset = startOffset;
      this.internalObject = internalObject;
    }
    
    /// <summary>
    /// Creates an XML reader that reads from this document.
    /// </summary>
    /// <remarks>
    /// The reader will ignore comments and processing instructions; and will not have line information.
    /// </remarks>
    public XmlReader CreateReader()
    {
      return new AXmlReader(CreateIteratorForReader());
    }
    
    /// <summary>
    /// Creates an XML reader that reads from this document.
    /// </summary>
    /// <param name="settings">Reader settings.
    /// Currently, only <c>IgnoreComments</c> is supported.</param>
    /// <remarks>
    /// The reader will not have line information.
    /// </remarks>
    public XmlReader CreateReader(XmlReaderSettings settings)
    {
      return new AXmlReader(CreateIteratorForReader(), settings);
    }
    
    /// <summary>
    /// Creates an XML reader that reads from this document.
    /// </summary>
    /// <param name="settings">Reader settings.
    /// Currently, only <c>IgnoreComments</c> is supported.</param>
    /// <param name="document">
    /// The document that was used to parse the XML. It is used to convert offsets to line information.
    /// </param>
    public XmlReader CreateReader(XmlReaderSettings settings, IDocument document)
    {
      if (document == null)
        throw new ArgumentNullException("document");
      return new AXmlReader(CreateIteratorForReader(), settings, document.GetLocation);
    }
    
    /// <summary>
    /// Creates an XML reader that reads from this document.
    /// </summary>
    /// <param name="settings">Reader settings.
    /// Currently, only <c>IgnoreComments</c> is supported.</param>
    /// <param name="offsetToTextLocation">
    /// A function for converting offsets to line information.
    /// </param>
    public XmlReader CreateReader(XmlReaderSettings settings, Func<int, TextLocation> offsetToTextLocation)
    {
      return new AXmlReader(CreateIteratorForReader(), settings, offsetToTextLocation);
    }
    
    internal virtual ObjectIterator CreateIteratorForReader()
    {
      return new ObjectIterator(new[] { internalObject }, startOffset);
    }
    
    /// <summary>
    /// Gets the parent node.
    /// </summary>
    public AXmlObject Parent {
      get { return parent; }
    }
    
    /// <summary>
    /// Gets the list of child objects.
    /// </summary>
    public IList<AXmlObject> Children {
      get {
        var result = LazyInit.VolatileRead(ref this.children);
        if (result != null) {
          return result;
        } else {
          if (internalObject.NestedObjects != null) {
            var array = new AXmlObject[internalObject.NestedObjects.Length];
            for (int i = 0; i < array.Length; i++) {
              array[i] = internalObject.NestedObjects[i].CreatePublicObject(this, startOffset);
            }
            result = Array.AsReadOnly(array);
          } else {
            result = EmptyList<AXmlObject>.Instance;
          }
          return LazyInit.GetOrSet(ref this.children, result);
        }
      }
    }
    
    /// <summary>
    /// Gets a child fully containg the given offset.
    /// Goes recursively down the tree.
    /// Special case if at the end of attribute or text
    /// </summary>
    public AXmlObject GetChildAtOffset(int offset)
    {
      foreach(AXmlObject child in this.Children) {
        if (offset == child.EndOffset && (child is AXmlAttribute || child is AXmlText))
          return child;
        if (child.StartOffset < offset && offset < child.EndOffset) {
          return child.GetChildAtOffset(offset);
        }
      }
      return this; // No children at offset
    }
    
    /// <summary>
    /// The error that occured in the context of this node (excluding nested nodes)
    /// </summary>
    public IEnumerable<SyntaxError> MySyntaxErrors {
      get {
        if (internalObject.SyntaxErrors != null) {
          return internalObject.SyntaxErrors.Select(e => new SyntaxError(startOffset + e.RelativeStart, startOffset + e.RelativeEnd, e.Description));
        } else {
          return EmptyList<SyntaxError>.Instance;
        }
      }
    }
    
    /// <summary>
    /// The error that occured in the context of this node and all nested nodes.
    /// It has O(n) cost.
    /// </summary>
    public IEnumerable<SyntaxError> SyntaxErrors {
      get {
        return TreeTraversal.PreOrder(this, n => n.Children).SelectMany(obj => obj.MySyntaxErrors);
      }
    }
    
    /// <summary> Get all ancestors of this node </summary>
    public IEnumerable<AXmlObject> Ancestors {
      get {
        AXmlObject curr = this.Parent;
        while(curr != null) {
          yield return curr;
          curr = curr.Parent;
        }
      }
    }
    
    #region Helper methods
    
    /// <summary> The part of name before ":" </summary>
    /// <returns> Empty string if not found </returns>
    internal static string GetNamespacePrefix(string name)
    {
      if (string.IsNullOrEmpty(name)) return string.Empty;
      int colonIndex = name.IndexOf(':');
      if (colonIndex != -1) {
        return name.Substring(0, colonIndex);
      } else {
        return string.Empty;
      }
    }
    
    /// <summary> The part of name after ":" </summary>
    /// <returns> Whole name if ":" not found </returns>
    internal static string GetLocalName(string name)
    {
      if (string.IsNullOrEmpty(name)) return string.Empty;
      int colonIndex = name.IndexOf(':');
      if (colonIndex != -1) {
        return name.Remove(0, colonIndex + 1);
      } else {
        return name ?? string.Empty;
      }
    }
    
    #endregion
    
    /// <summary> Call appropriate visit method on the given visitor </summary>
    public abstract void AcceptVisitor(AXmlVisitor visitor);
    
    /// <summary>
    /// Gets the start offset of the segment.
    /// </summary>
    public int StartOffset {
      get { return startOffset; }
    }
    
    int ISegment.Offset {
      get { return startOffset; }
    }
    
    /// <inheritdoc/>
    public int Length {
      get { return internalObject.Length; }
    }
    
    /// <inheritdoc/>
    public int EndOffset {
      get { return startOffset + internalObject.Length; }
    }
  }
}