SharpDevelop/ICSharpCode.NRefactory.Tests/CSharp/Resolver/FindReferencesTest.cs

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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using ICSharpCode.NRefactory.CSharp.TypeSystem;
using ICSharpCode.NRefactory.TypeSystem;
using NUnit.Framework;

namespace ICSharpCode.NRefactory.CSharp.Resolver
{
	[TestFixture]
	public class FindReferencesTest
	{
		CompilationUnit compilationUnit;
		CSharpParsedFile parsedFile;
		ICompilation compilation;
		
		void Init(string code)
		{
			compilationUnit = new CSharpParser().Parse(new StringReader(code), "test.cs");
			parsedFile = compilationUnit.ToTypeSystem();
			compilation = TypeSystemHelper.CreateCompilation(parsedFile);
		}
		
		AstNode[] FindReferences(IEntity entity)
		{
			var result = new List<AstNode>();
			var findReferences = new FindReferences();
			var searchScopes = findReferences.GetSearchScopes(entity);
			findReferences.FindReferencesInFile(searchScopes, parsedFile, compilationUnit, compilation,
			                                    (node, rr) => result.Add(node), CancellationToken.None);
			return result.OrderBy(n => n.StartLocation).ToArray();
		}
		
		[Test]
		public void FindMethodGroupReference()
		{
			Init(@"using System;
class Test {
  Action<int> x = M;
  Action<string> y = M;
  static void M(int a) {}
  static void M(string a) {}
}");
			var test = compilation.MainAssembly.TopLevelTypeDefinitions.Single();
			var m_int = test.Methods.Single(m => m.Name == "M" && m.Parameters.Single().Type.Name == "Int32");
			var m_string = test.Methods.Single(m => m.Name == "M" && m.Parameters.Single().Type.Name == "String");
			Assert.AreEqual(new int[] { 3, 5 }, FindReferences(m_int).Select(n => n.StartLocation.Line).ToArray());
			Assert.AreEqual(new int[] { 4, 6 }, FindReferences(m_string).Select(n => n.StartLocation.Line).ToArray());
		}
		
		[Test]
		public void FindMethodGroupReferenceInOtherMethodCall()
		{
			Init(@"using System;
class Test {
 static void T(Action<int> a, Action<string> b) {
  this.T(M, M);
 }
 static void M(int a) {}
 static void M(string a) {}
}");
			var test = compilation.MainAssembly.TopLevelTypeDefinitions.Single();
			var m_int = test.Methods.Single(m => m.Name == "M" && m.Parameters.Single().Type.Name == "Int32");
			var m_string = test.Methods.Single(m => m.Name == "M" && m.Parameters.Single().Type.Name == "String");
			Assert.AreEqual(new [] { new TextLocation(4, 10), new TextLocation(6, 2) },
			                FindReferences(m_int).Select(n => n.StartLocation).ToArray());
			Assert.AreEqual(new [] { new TextLocation(4, 13), new TextLocation(7, 2) },
			                FindReferences(m_string).Select(n => n.StartLocation).ToArray());
		}
		
		[Test]
		public void FindMethodGroupReferenceInExplicitDelegateCreation()
		{
			Init(@"using System;
class Test {
 static void T(Action<int> a, Action<string> b) {
  this.T(new Action<int>(M), new Action<string>(M));
 }
 static void M(int a) {}
 static void M(string a) {}
}");
			var test = compilation.MainAssembly.TopLevelTypeDefinitions.Single();
			var m_int = test.Methods.Single(m => m.Name == "M" && m.Parameters.Single().Type.Name == "Int32");
			var m_string = test.Methods.Single(m => m.Name == "M" && m.Parameters.Single().Type.Name == "String");
			Assert.AreEqual(new [] { new TextLocation(4, 26), new TextLocation(6, 2) },
			                FindReferences(m_int).Select(n => n.StartLocation).ToArray());
			Assert.AreEqual(new [] { new TextLocation(4, 49), new TextLocation(7, 2) },
			                FindReferences(m_string).Select(n => n.StartLocation).ToArray());
		}
		
		[Test]
		public void FindReferenceToGetEnumeratorUsedImplicitlyInForeach()
		{
			Init(@"using System;
class MyEnumerable {
 public System.Collections.IEnumerator GetEnumerator();
}
class Test {
 static void T() {
  var x = new MyEnumerable();
  foreach (var y in x) {
  }
 }
}");
			var test = compilation.MainAssembly.TopLevelTypeDefinitions.Single(t => t.Name == "MyEnumerable");
			var getEnumerator = test.Methods.Single(m => m.Name == "GetEnumerator");
			var actual = FindReferences(getEnumerator).ToList();
			Assert.AreEqual(2, actual.Count);
			Assert.IsTrue(actual.Any(r => r.StartLocation.Line == 3 && r is MethodDeclaration));
			Assert.IsTrue(actual.Any(r => r.StartLocation.Line == 8 && r is ForeachStatement));
		}
		
		[Test]
		public void FindReferencesForOpImplicitInLocalVariableInitialization()
		{
			Init(@"using System;
class Test {
 static void T() {
  int x = new Test();
 }
 public static implicit operator int(Test x) { return 0; }
}");
			var test = compilation.MainAssembly.TopLevelTypeDefinitions.Single(t => t.Name == "Test");
			var opImplicit = test.Methods.Single(m => m.Name == "op_Implicit");
			var actual = FindReferences(opImplicit).ToList();
			Assert.AreEqual(2, actual.Count);
			Assert.IsTrue(actual.Any(r => r.StartLocation.Line == 4 && r is ObjectCreateExpression));
			Assert.IsTrue(actual.Any(r => r.StartLocation.Line == 6 && r is OperatorDeclaration));
		}
	}
}