source: branches/2839_HiveProjectManagement/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/TypeSystem/ComHelper.cs @ 15761

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// 
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// substantial portions of the Software.
// 
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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using System;
using System.Linq;
using ICSharpCode.NRefactory.Semantics;

namespace ICSharpCode.NRefactory.TypeSystem
{
  /// <summary>
  /// Helper methods for COM.
  /// </summary>
  public static class ComHelper
  {
    static bool IsComAttribute(IAttribute attribute, string name)
    {
      return attribute.AttributeType.Name == name && attribute.AttributeType.Namespace == "System.Runtime.InteropServices";
    }
    
    /// <summary>
    /// Gets whether the specified type is imported from COM.
    /// </summary>
    public static bool IsComImport(ITypeDefinition typeDefinition)
    {
      return typeDefinition != null
        && typeDefinition.Kind == TypeKind.Interface
        && typeDefinition.Attributes.Any(a => IsComAttribute(a, "ComImportAttribute"));
    }
    
    /// <summary>
    /// Gets the CoClass of the specified COM interface.
    /// </summary>
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "Co",
                                                     Justification = "Consistent with CoClassAttribute")]
    public static IType GetCoClass(ITypeDefinition typeDefinition)
    {
      if (typeDefinition == null)
        return SpecialType.UnknownType;
      var coClassAttribute = typeDefinition.Attributes.FirstOrDefault(a => IsComAttribute(a, "CoClassAttribute"));
      if (coClassAttribute != null && coClassAttribute.PositionalArguments.Count == 1) {
        var rr = coClassAttribute.PositionalArguments[0] as TypeOfResolveResult;
        if (rr != null)
          return rr.ReferencedType;
      }
      return SpecialType.UnknownType;
    }
  }
}