Men005FileTooLong.cs

namespace Menees.Analyzers;

[DiagnosticAnalyzer(LanguageNames.CSharp)]
public sealed class Men005FileTooLong : Analyzer
{
	#region Public Constants

	public const string DiagnosticId = "MEN005";

	#endregion

	#region Private Data Members

	private static readonly LocalizableString Title =
		new LocalizableResourceString(nameof(Resources.Men005Title), Resources.ResourceManager, typeof(Resources));

	private static readonly LocalizableString MessageFormat =
		new LocalizableResourceString(nameof(Resources.Men005MessageFormat), Resources.ResourceManager, typeof(Resources));

	private static readonly LocalizableString Description =
		new LocalizableResourceString(nameof(Resources.Men005Description), Resources.ResourceManager, typeof(Resources));

	private static readonly DiagnosticDescriptor Rule =
		new(DiagnosticId, Title, MessageFormat, Rules.Layout, DiagnosticSeverity.Warning, Rules.EnabledByDefault, Description);

	#endregion

	#region Public Properties

	public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics => ImmutableArray.Create(Rule);

	#endregion

	#region Public Methods

	public override void Initialize(AnalysisContext context)
	{
		base.Initialize(context);
		context.RegisterSyntaxTreeActionHonorExclusions(this, this.HandleSyntaxTree);
	}

	#endregion

	#region Private Methods

	private void HandleSyntaxTree(SyntaxTreeAnalysisContext context)
	{
		SyntaxTree tree = context.Tree;
		if (tree.TryGetText(out SourceText? text))
		{
			int maxLength = this.Settings.MaxFileLines;
			int fileLength = text.Lines.Count;
			if (fileLength > maxLength)
			{
				// Only mark the first line past the limit.  Marking every line from maxLength to fileLength-1 was ugly.
				var fileLocation = Rules.GetFileLocation(tree, text, maxLength, maxLength);
				context.ReportDiagnostic(Diagnostic.Create(Rule, fileLocation.Item2, fileLocation.Item1, maxLength, fileLength));
			}
		}
	}

	#endregion
}