source: branches/2870_AutoDiff-nuget/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Highlighting/Xshd/SaveXshdVisitor.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
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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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// DEALINGS IN THE SOFTWARE.

using System;
using System.Linq;
using System.Xml;

namespace ICSharpCode.AvalonEdit.Highlighting.Xshd
{
  /// <summary>
  /// Xshd visitor implementation that saves an .xshd file as XML.
  /// </summary>
  public sealed class SaveXshdVisitor : IXshdVisitor
  {
    /// <summary>
    /// XML namespace for XSHD.
    /// </summary>
    public const string Namespace = V2Loader.Namespace;
    
    XmlWriter writer;
    
    /// <summary>
    /// Creates a new SaveXshdVisitor instance.
    /// </summary>
    public SaveXshdVisitor(XmlWriter writer)
    {
      if (writer == null)
        throw new ArgumentNullException("writer");
      this.writer = writer;
    }
    
    /// <summary>
    /// Writes the specified syntax definition.
    /// </summary>
    public void WriteDefinition(XshdSyntaxDefinition definition)
    {
      if (definition == null)
        throw new ArgumentNullException("definition");
      writer.WriteStartElement("SyntaxDefinition", Namespace);
      if (definition.Name != null)
        writer.WriteAttributeString("name", definition.Name);
      if (definition.Extensions != null)
        writer.WriteAttributeString("extensions", string.Join(";", definition.Extensions.ToArray()));
      
      definition.AcceptElements(this);
      
      writer.WriteEndElement();
    }
    
    object IXshdVisitor.VisitRuleSet(XshdRuleSet ruleSet)
    {
      writer.WriteStartElement("RuleSet", Namespace);
      
      if (ruleSet.Name != null)
        writer.WriteAttributeString("name", ruleSet.Name);
      WriteBoolAttribute("ignoreCase", ruleSet.IgnoreCase);
      
      ruleSet.AcceptElements(this);
      
      writer.WriteEndElement();
      return null;
    }
    
    void WriteBoolAttribute(string attributeName, bool? value)
    {
      if (value != null) {
        writer.WriteAttributeString(attributeName, value.Value ? "true" : "false");
      }
    }
    
    void WriteRuleSetReference(XshdReference<XshdRuleSet> ruleSetReference)
    {
      if (ruleSetReference.ReferencedElement != null) {
        if (ruleSetReference.ReferencedDefinition != null)
          writer.WriteAttributeString("ruleSet", ruleSetReference.ReferencedDefinition + "/" + ruleSetReference.ReferencedElement);
        else
          writer.WriteAttributeString("ruleSet", ruleSetReference.ReferencedElement);
      }
    }
    
    void WriteColorReference(XshdReference<XshdColor> color)
    {
      if (color.InlineElement != null) {
        WriteColorAttributes(color.InlineElement);
      } else if (color.ReferencedElement != null) {
        if (color.ReferencedDefinition != null)
          writer.WriteAttributeString("color", color.ReferencedDefinition + "/" + color.ReferencedElement);
        else
          writer.WriteAttributeString("color", color.ReferencedElement);
      }
    }
    
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Globalization", "CA1308:NormalizeStringsToUppercase", Justification = "The file format requires lowercase, and all possible values are English-only")]
    void WriteColorAttributes(XshdColor color)
    {
      if (color.Foreground != null)
        writer.WriteAttributeString("foreground", color.Foreground.ToString());
      if (color.Background != null)
        writer.WriteAttributeString("background", color.Background.ToString());
      if (color.FontWeight != null)
        writer.WriteAttributeString("fontWeight", V2Loader.FontWeightConverter.ConvertToInvariantString(color.FontWeight.Value).ToLowerInvariant());
      if (color.FontStyle != null)
        writer.WriteAttributeString("fontStyle", V2Loader.FontStyleConverter.ConvertToInvariantString(color.FontStyle.Value).ToLowerInvariant());
    }
    
    object IXshdVisitor.VisitColor(XshdColor color)
    {
      writer.WriteStartElement("Color", Namespace);
      if (color.Name != null)
        writer.WriteAttributeString("name", color.Name);
      WriteColorAttributes(color);
      if (color.ExampleText != null)
        writer.WriteAttributeString("exampleText", color.ExampleText);
      writer.WriteEndElement();
      return null;
    }
    
    object IXshdVisitor.VisitKeywords(XshdKeywords keywords)
    {
      writer.WriteStartElement("Keywords", Namespace);
      WriteColorReference(keywords.ColorReference);
      foreach (string word in keywords.Words) {
        writer.WriteElementString("Word", Namespace, word);
      }
      writer.WriteEndElement();
      return null;
    }
    
    object IXshdVisitor.VisitSpan(XshdSpan span)
    {
      writer.WriteStartElement("Span", Namespace);
      WriteColorReference(span.SpanColorReference);
      if (span.BeginRegexType == XshdRegexType.Default && span.BeginRegex != null)
        writer.WriteAttributeString("begin", span.BeginRegex);
      if (span.EndRegexType == XshdRegexType.Default && span.EndRegex != null)
        writer.WriteAttributeString("end", span.EndRegex);
      WriteRuleSetReference(span.RuleSetReference);
      if (span.Multiline)
        writer.WriteAttributeString("multiline", "true");
      
      if (span.BeginRegexType == XshdRegexType.IgnorePatternWhitespace)
        WriteBeginEndElement("Begin", span.BeginRegex, span.BeginColorReference);
      if (span.EndRegexType == XshdRegexType.IgnorePatternWhitespace)
        WriteBeginEndElement("End", span.EndRegex, span.EndColorReference);
      
      if (span.RuleSetReference.InlineElement != null)
        span.RuleSetReference.InlineElement.AcceptVisitor(this);
      
      writer.WriteEndElement();
      return null;
    }
    
    void WriteBeginEndElement(string elementName, string regex, XshdReference<XshdColor> colorReference)
    {
      if (regex != null) {
        writer.WriteStartElement(elementName, Namespace);
        WriteColorReference(colorReference);
        writer.WriteString(regex);
        writer.WriteEndElement();
      }
    }
    
    object IXshdVisitor.VisitImport(XshdImport import)
    {
      writer.WriteStartElement("Import", Namespace);
      WriteRuleSetReference(import.RuleSetReference);
      writer.WriteEndElement();
      return null;
    }
    
    object IXshdVisitor.VisitRule(XshdRule rule)
    {
      writer.WriteStartElement("Rule", Namespace);
      WriteColorReference(rule.ColorReference);
      
      writer.WriteString(rule.Regex);
      
      writer.WriteEndElement();
      return null;
    }
  }
}