SimileClassifierProvider.cs

using Microsoft.VisualStudio.Text;
using Microsoft.VisualStudio.Text.Classification;
using Microsoft.VisualStudio.Utilities;
using System.ComponentModel.Composition;

namespace ConsoleCompare
{
	/// <summary>
	/// Classifier provider. It adds the classifier to the set of classifiers.
	/// </summary>
	[Export(typeof(IClassifierProvider))]
	[ContentType("simile")]
	internal class SimileClassifierProvider : IClassifierProvider
	{
		// Disable "Field is never assigned to..." compiler's warning. Justification: the field is assigned by MEF.
#pragma warning disable 649
		/// <summary>
		/// Classification registry to be used for getting a reference
		/// to the custom classification type later.
		/// </summary>
		[Import]
		private IClassificationTypeRegistryService classificationRegistry;
#pragma warning restore 649

		#region IClassifierProvider

		/// <summary>
		/// Gets a classifier for the given text buffer.
		/// </summary>
		/// <param name="buffer">The <see cref="ITextBuffer"/> to classify.</param>
		/// <returns>A classifier for the text buffer, or null if the provider cannot do so in its current state.</returns>
		public IClassifier GetClassifier(ITextBuffer buffer)
		{
			return buffer.Properties.GetOrCreateSingletonProperty<SimileClassifier>(creator: () => new SimileClassifier(this.classificationRegistry));
		}

		#endregion

	}
}