source: branches/2839_HiveProjectManagement/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Highlighting/Xshd/HighlightingLoader.cs

// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// 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;
using System.Xml.Schema;

namespace ICSharpCode.AvalonEdit.Highlighting.Xshd
{
  /// <summary>
  /// Static class with helper methods to load XSHD highlighting files.
  /// </summary>
  public static class HighlightingLoader
  {
    #region XSHD loading
    /// <summary>
    /// Lodas a syntax definition from the xml reader.
    /// </summary>
    public static XshdSyntaxDefinition LoadXshd(XmlReader reader)
    {
      return LoadXshd(reader, false);
    }
    
    internal static XshdSyntaxDefinition LoadXshd(XmlReader reader, bool skipValidation)
    {
      if (reader == null)
        throw new ArgumentNullException("reader");
      try {
        reader.MoveToContent();
        if (reader.NamespaceURI == V2Loader.Namespace) {
          return V2Loader.LoadDefinition(reader, skipValidation);
        } else {
          return V1Loader.LoadDefinition(reader, skipValidation);
        }
      } catch (XmlSchemaException ex) {
        throw WrapException(ex, ex.LineNumber, ex.LinePosition);
      } catch (XmlException ex) {
        throw WrapException(ex, ex.LineNumber, ex.LinePosition);
      }
    }
    
    static Exception WrapException(Exception ex, int lineNumber, int linePosition)
    {
      return new HighlightingDefinitionInvalidException(FormatExceptionMessage(ex.Message, lineNumber, linePosition), ex);
    }
    
    internal static string FormatExceptionMessage(string message, int lineNumber, int linePosition)
    {
      if (lineNumber <= 0)
        return message;
      else
        return "Error at position (line " + lineNumber + ", column " + linePosition + "):\n" + message;
    }
    
    internal static XmlReader GetValidatingReader(XmlReader input, bool ignoreWhitespace, XmlSchemaSet schemaSet)
    {
      XmlReaderSettings settings = new XmlReaderSettings();
      settings.CloseInput = true;
      settings.IgnoreComments = true;
      settings.IgnoreWhitespace = ignoreWhitespace;
      if (schemaSet != null) {
        settings.Schemas = schemaSet;
        settings.ValidationType = ValidationType.Schema;
      }
      return XmlReader.Create(input, settings);
    }
    
    internal static XmlSchemaSet LoadSchemaSet(XmlReader schemaInput)
    {
      XmlSchemaSet schemaSet = new XmlSchemaSet();
      schemaSet.Add(null, schemaInput);
      schemaSet.ValidationEventHandler += delegate(object sender, ValidationEventArgs args) {
        throw new HighlightingDefinitionInvalidException(args.Message);
      };
      return schemaSet;
    }
    #endregion
    
    #region Load Highlighting from XSHD
    /// <summary>
    /// Creates a highlighting definition from the XSHD file.
    /// </summary>
    public static IHighlightingDefinition Load(XshdSyntaxDefinition syntaxDefinition, IHighlightingDefinitionReferenceResolver resolver)
    {
      if (syntaxDefinition == null)
        throw new ArgumentNullException("syntaxDefinition");
      return new XmlHighlightingDefinition(syntaxDefinition, resolver);
    }
    
    /// <summary>
    /// Creates a highlighting definition from the XSHD file.
    /// </summary>
    public static IHighlightingDefinition Load(XmlReader reader, IHighlightingDefinitionReferenceResolver resolver)
    {
      return Load(LoadXshd(reader), resolver);
    }
    #endregion
  }
}