SharpDevelop/ICSharpCode.NRefactory.Tests/CSharp/Parser/ParseSelfTests.cs

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using System;
using System.IO;
using ICSharpCode.Editor;
using ICSharpCode.NRefactory.TypeSystem.Implementation;
using NUnit.Framework;

namespace ICSharpCode.NRefactory.CSharp.Parser
{
	/// <summary>
	/// Test fixture that parses NRefactory itself,
	/// ensures that there are no parser crashes while doing so,
	/// and that the returned positions are consistent.
	/// </summary>
	[TestFixture]
	public class ParseSelfTests
	{
		string[] fileNames;
		
		[TestFixtureSetUp]
		public void SetUp()
		{
			string path = Path.GetFullPath (Path.Combine ("..", "..", ".."));
			if (!File.Exists(Path.Combine(path, "NRefactory.sln")))
				throw new InvalidOperationException("Test cannot find the NRefactory source code in " + path);
			fileNames = Directory.GetFiles(path, "*.cs", SearchOption.AllDirectories);
		}
		
		[Test]
		public void GenerateTypeSystem()
		{
			SimpleProjectContent pc = new SimpleProjectContent();
			CSharpParser parser = new CSharpParser();
			parser.GenerateTypeSystemMode = true;
			foreach (string fileName in fileNames) {
				CompilationUnit cu;
				using (var fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.SequentialScan)) {
					cu = parser.Parse(fs);
				}
				TypeSystemConvertVisitor cv = new TypeSystemConvertVisitor(pc, fileName);
				pc.UpdateProjectContent(null, cv.Convert(cu));
			}
		}
		
		#region ParseAndCheckPositions
		string currentFileName;
		ReadOnlyDocument currentDocument;
		
		[Test]
		public void ParseAndCheckPositions()
		{
			CSharpParser parser = new CSharpParser();
			foreach (string fileName in fileNames) {
				this.currentDocument = new ReadOnlyDocument(File.ReadAllText(fileName));
				CompilationUnit cu = parser.Parse(currentDocument.CreateReader());
				this.currentFileName = fileName;
				CheckPositionConsistency(cu);
				CheckMissingTokens(cu);
			}
		}
		
		void CheckPositionConsistency(AstNode node)
		{
			string comment = "(" + node.GetType().Name + " at " + node.StartLocation + " in " + currentFileName + ")";
			Assert.IsTrue(node.StartLocation <= node.EndLocation, "StartLocation must be before EndLocation " + comment);
			var prevNodeEnd = node.StartLocation;
			for (AstNode child = node.FirstChild; child != null; child = child.NextSibling) {
				Assert.IsTrue(child.StartLocation >= prevNodeEnd, "Child must start after previous sibling " + comment);
				CheckPositionConsistency(child);
				prevNodeEnd = child.EndLocation;
			}
			Assert.IsTrue(prevNodeEnd <= node.EndLocation, "Last child must end before parent node ends " + comment);
		}
		
		void CheckMissingTokens(AstNode node)
		{
			if (node is IRelocatable) {
				Assert.IsNull(node.FirstChild, "Token nodes should not have children");
			} else {
				var prevNodeEnd = node.StartLocation;
				for (AstNode child = node.FirstChild; child != null; child = child.NextSibling) {
					CheckWhitespace(prevNodeEnd, child.StartLocation);
					CheckMissingTokens(child);
					prevNodeEnd = child.EndLocation;
				}
				CheckWhitespace(prevNodeEnd, node.EndLocation);
			}
		}
		
		void CheckWhitespace(AstLocation whitespaceStart, AstLocation whitespaceEnd)
		{
			if (whitespaceStart == whitespaceEnd)
				return;
			int start = currentDocument.GetOffset(whitespaceStart.Line, whitespaceStart.Column);
			int end = currentDocument.GetOffset(whitespaceEnd.Line, whitespaceEnd.Column);
			string text = currentDocument.GetText(start, end - start);
			Assert.IsTrue(string.IsNullOrWhiteSpace(text), "Expected whitespace between " + whitespaceStart + " and " + whitespaceEnd
			              + ", but got '" + text + "' (in " + currentFileName + ")");
		}
		#endregion
	}
}