source: branches/2990_VariableImpactBasedFeatureSelection/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory.Xml-5.5.0/AXmlParser.cs

// Copyright (c) 2009-2013 AlphaSierraPapa for the SharpDevelop Team
// 
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// 
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// substantial portions of the Software.
// 
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// 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.Diagnostics;
using System.Linq;
using System.Threading;
using ICSharpCode.NRefactory.Editor;
using ICSharpCode.NRefactory.Utils;

namespace ICSharpCode.NRefactory.Xml
{
  /// <summary>
  /// XML parser that is error tolerant.
  /// </summary>
  public class AXmlParser
  {
    /// <summary>
    /// Generate syntax error when seeing entity reference other then the built-in ones
    /// </summary>
    public bool UnknownEntityReferenceIsError { get; set; }
    
    IList<AXmlObject> CreatePublic(IList<InternalObject> internalObjects)
    {
      var publicObjects = new AXmlObject[internalObjects.Count];
      int pos = 0;
      for (int i = 0; i < internalObjects.Count; i++) {
        publicObjects[i] = internalObjects[i].CreatePublicObject(null, pos);
        pos += internalObjects[i].Length;
      }
      return Array.AsReadOnly(publicObjects);
    }
    
    /// <summary>
    /// Parses a document into a flat list of tags.
    /// </summary>
    /// <returns>Parsed tag soup.</returns>
    public IList<AXmlObject> ParseTagSoup(ITextSource textSource,
                                          CancellationToken cancellationToken = default(CancellationToken))
    {
      if (textSource == null)
        throw new ArgumentNullException("textSource");
      var reader = new TagReader(this, textSource, false);
      var internalObjects = reader.ReadAllObjects(cancellationToken);
      return CreatePublic(internalObjects);
    }
    
    /// <summary>
    /// Parses a document incrementally into a flat list of tags.
    /// </summary>
    /// <param name="oldParserState">The parser state from a previous call to ParseIncremental(). Use null for the first call.</param>
    /// <param name="newTextSource">The text source for the new document version.</param>
    /// <param name="newParserState">Out: the new parser state, pass this to the next ParseIncremental() call.</param>
    /// <param name="cancellationToken">Optional: cancellation token.</param>
    /// <returns>Parsed tag soup.</returns>
    public IList<AXmlObject> ParseTagSoupIncremental(
      IncrementalParserState oldParserState, ITextSource newTextSource, out IncrementalParserState newParserState,
      CancellationToken cancellationToken = default(CancellationToken))
    {
      if (newTextSource == null)
        throw new ArgumentNullException("newTextSource");
      var internalObjects = InternalParseIncremental(oldParserState, newTextSource, out newParserState, false, cancellationToken);
      return CreatePublic(internalObjects);
    }
    
    List<InternalObject> InternalParseIncremental(
      IncrementalParserState oldParserState, ITextSource newTextSource, out IncrementalParserState newParserState,
      bool collapseProperlyNestedElements, CancellationToken cancellationToken)
    {
      var reader = new TagReader(this, newTextSource, collapseProperlyNestedElements);
      ITextSourceVersion newVersion = newTextSource.Version;
      var reuseMap = oldParserState != null ? oldParserState.GetReuseMapTo(newVersion) : null;
      
      List<InternalObject> internalObjects;
      if (reuseMap != null)
        internalObjects = reader.ReadAllObjectsIncremental(oldParserState.Objects, reuseMap, cancellationToken);
      else
        internalObjects = reader.ReadAllObjects(cancellationToken);
      
      if (newVersion != null)
        newParserState = new IncrementalParserState(newTextSource.TextLength, newVersion, internalObjects.ToArray());
      else
        newParserState = null;
      
      return internalObjects;
    }
    
    /// <summary>
    /// Parses a document.
    /// </summary>
    public AXmlDocument Parse(ITextSource textSource, CancellationToken cancellationToken = default(CancellationToken))
    {
      if (textSource == null)
        throw new ArgumentNullException("textSource");
      var reader = new TagReader(this, textSource, true);
      var internalObjects = reader.ReadAllObjects(cancellationToken);
      var heuristic = new TagMatchingHeuristics(textSource);
      return new AXmlDocument(null, 0, heuristic.CreateDocument(internalObjects, cancellationToken));
    }
    
    /// <summary>
    /// Parses a document incrementally into a flat list of tags.
    /// </summary>
    /// <param name="oldParserState">The parser state from a previous call to ParseIncremental(). Use null for the first call.</param>
    /// <param name="newTextSource">The text source for the new document version.</param>
    /// <param name="newParserState">Out: the new parser state, pass this to the next ParseIncremental() call.</param>
    /// <param name="cancellationToken">Optional: cancellation token.</param>
    /// <returns>Parsed tag soup.</returns>
    public AXmlDocument ParseIncremental(
      IncrementalParserState oldParserState, ITextSource newTextSource, out IncrementalParserState newParserState,
      CancellationToken cancellationToken = default(CancellationToken))
    {
      if (newTextSource == null)
        throw new ArgumentNullException("newTextSource");
      var internalObjects = InternalParseIncremental(oldParserState, newTextSource, out newParserState, true, cancellationToken);
      var heuristic = new TagMatchingHeuristics(newTextSource);
      return new AXmlDocument(null, 0, heuristic.CreateDocument(internalObjects, cancellationToken));
    }
    
    /// <summary>
    /// Checks whether the given name is a valid XML name.
    /// </summary>
    public static bool IsValidXmlName(string name)
    {
      if (string.IsNullOrWhiteSpace(name))
        throw new ArgumentException("The XML name cannot be null, empty or consist solely of white space", "name");
      return TagReader.IsValidName(name);
    }
  }
}