Fix nullability warnings in ILSpyX

ICSharpCode.ILSpyX/ICSharpCode.ILSpyX.csproj

@@ -4,6 +4,7 @@
     <TargetFramework>net6.0</TargetFramework>
     <Nullable>enable</Nullable>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <WarningsAsErrors>nullable</WarningsAsErrors>
     
     <SignAssembly>True</SignAssembly>
     <AssemblyOriginatorKeyFile>..\ICSharpCode.Decompiler\ICSharpCode.Decompiler.snk</AssemblyOriginatorKeyFile>

ICSharpCode.ILSpyX/Search/AbstractEntitySearchStrategy.cs

@@ -37,12 +37,12 @@ namespace ICSharpCode.ILSpyX.Search
 			this.apiVisibility = apiVisibility;
 		}
 
-		protected bool CheckVisibility(IEntity entity)
+		protected bool CheckVisibility(IEntity? entity)
 		{
 			if (apiVisibility == ApiVisibility.All)
 				return true;
 
-			do
+			while (entity != null)
 			{
 				if (apiVisibility == ApiVisibility.PublicOnly)
 				{
@@ -58,7 +58,6 @@ namespace ICSharpCode.ILSpyX.Search
 				}
 				entity = entity.DeclaringTypeDefinition;
 			}
-			while (entity != null);
 
 			return true;
 		}
@@ -67,7 +66,7 @@ namespace ICSharpCode.ILSpyX.Search
 		{
 			if (searchRequest.InAssembly != null)
 			{
-				if (!entity.ParentModule.FullAssemblyName.Contains(searchRequest.InAssembly))
+				if (entity.ParentModule == null || !entity.ParentModule.FullAssemblyName.Contains(searchRequest.InAssembly))
 				{
 					return false;
 				}

ICSharpCode.ILSpyX/Search/AssemblySearchStrategy.cs

@@ -41,19 +41,27 @@ namespace ICSharpCode.ILSpyX.Search
 
 			if (searchKind == AssemblySearchKind.NameOrFileName)
 			{
-				string localName = GetNameToMatch(module, AssemblySearchKind.Name);
-				string fileName = Path.GetFileName(GetNameToMatch(module, AssemblySearchKind.FilePath));
-				if (IsMatch(localName) || IsMatch(fileName))
+				string? localName = GetNameToMatch(module, AssemblySearchKind.Name);
+				string? filePath = GetNameToMatch(module, AssemblySearchKind.FilePath);
+				if (localName != null && IsMatch(localName))
+				{
 					OnFoundResult(module);
+				}
+				else if (filePath != null)
+				{
+					string fileName = Path.GetFileName(filePath);
+					if (IsMatch(fileName))
+						OnFoundResult(module);
+				}
 				return;
 			}
 
-			string name = GetNameToMatch(module, searchKind);
-			if (IsMatch(name))
+			string? name = GetNameToMatch(module, searchKind);
+			if (name != null && IsMatch(name))
 				OnFoundResult(module);
 		}
 
-		string GetNameToMatch(PEFile module, AssemblySearchKind kind)
+		string? GetNameToMatch(PEFile module, AssemblySearchKind kind)
 		{
 			switch (kind)
 			{

ICSharpCode.ILSpyX/Search/CSharpLexer.cs

@@ -16,6 +16,8 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 // DEALINGS IN THE SOFTWARE.
 
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Globalization;

ICSharpCode.ILSpyX/Search/LiteralSearchStrategy.cs

@@ -17,6 +17,7 @@
 // DEALINGS IN THE SOFTWARE.
 using System;
 using System.Collections.Concurrent;
+using System.Diagnostics;
 using System.Reflection.Metadata;
 using System.Threading;
 
@@ -35,8 +36,8 @@ namespace ICSharpCode.ILSpyX.Search
 {
 	public class LiteralSearchStrategy : AbstractEntitySearchStrategy
 	{
-		readonly TypeCode searchTermLiteralType;
-		readonly object searchTermLiteralValue;
+		readonly TypeCode searchTermLiteralType = TypeCode.Empty;
+		readonly object? searchTermLiteralValue;
 
 		public LiteralSearchStrategy(ILanguage language, ApiVisibility apiVisibility, SearchRequest request,
 			IProducerConsumerCollection<SearchResult> resultQueue)
@@ -131,10 +132,12 @@ namespace ICSharpCode.ILSpyX.Search
 				case TypeCode.Single:
 				case TypeCode.Double:
 				case TypeCode.String:
+					Debug.Assert(searchTermLiteralValue != null);
 					return searchTermLiteralValue.Equals(val);
 				default:
 					// substring search with searchTerm
-					return IsMatch(val.ToString());
+					string? valAsString = val.ToString();
+					return valAsString != null && IsMatch(valAsString);
 			}
 		}
 
@@ -143,6 +146,7 @@ namespace ICSharpCode.ILSpyX.Search
 			var blob = module.Reader.GetMethodBody(methodDefinition.RelativeVirtualAddress).GetILReader();
 			if (searchTermLiteralType == TypeCode.Int64)
 			{
+				Debug.Assert(searchTermLiteralValue != null);
 				long val = (long)searchTermLiteralValue;
 				while (blob.RemainingBytes > 0)
 				{
@@ -209,6 +213,7 @@ namespace ICSharpCode.ILSpyX.Search
 			}
 			else if (searchTermLiteralType != TypeCode.Empty)
 			{
+				Debug.Assert(searchTermLiteralValue != null);
 				ILOpCode expectedCode;
 				switch (searchTermLiteralType)
 				{

ICSharpCode.ILSpyX/Search/SearchResult.cs

@@ -42,14 +42,18 @@ namespace ICSharpCode.ILSpyX.Search
 
 		public float Fitness { get; set; }
 
+#nullable disable
 		public string Name { get; set; }
 		public string Location { get; set; }
 		public string Assembly { get; set; }
+#nullable enable
 		public object? ToolTip { get; set; }
+#nullable disable
 		public object Image { get; set; }
 		public object LocationImage { get; set; }
 
 		public object AssemblyImage { get; set; }
+#nullable enable
 
 		public override string ToString()
 		{
@@ -76,25 +80,33 @@ namespace ICSharpCode.ILSpyX.Search
 
 	public class MemberSearchResult : SearchResult
 	{
+#nullable disable
 		public IEntity Member { get; set; }
 		public override object Reference => Member;
+#nullable enable
 	}
 
 	public class ResourceSearchResult : SearchResult
 	{
+#nullable disable
 		public Resource Resource { get; set; }
+#nullable enable
 		public override object Reference => ValueTuple.Create(Resource, Name);
 	}
 
 	public class AssemblySearchResult : SearchResult
 	{
+#nullable disable
 		public PEFile Module { get; set; }
 		public override object Reference => Module;
+#nullable enable
 	}
 
 	public class NamespaceSearchResult : SearchResult
 	{
+#nullable disable
 		public INamespace Namespace { get; set; }
 		public override object Reference => Namespace;
+#nullable enable
 	}
 }