Recognize LLU and LU integer suffixes

Author: TechPizzaDev

sources/ClangSharp.PInvokeGenerator/PInvokeGenerator.VisitStmt.cs

@@ -1703,11 +1703,7 @@ private void VisitIntegerLiteral(IntegerLiteral integerLiteral)
     {
         var valueString = integerLiteral.ValueString;
 
-        if (valueString.EndsWith('l') || valueString.EndsWith('L'))
-        {
-            valueString = valueString[0..^1];
-        }
-        else if (valueString.EndsWith("ui8", StringComparison.OrdinalIgnoreCase))
+        if (valueString.EndsWith("ui8", StringComparison.OrdinalIgnoreCase))
         {
             valueString = valueString[0..^3];
         }
@@ -1731,20 +1727,31 @@ private void VisitIntegerLiteral(IntegerLiteral integerLiteral)
         {
             valueString = valueString[0..^3] + "L";
         }
-
-        if (valueString.EndsWith("ul", StringComparison.OrdinalIgnoreCase))
+        else if (
+            valueString.EndsWith("ull", StringComparison.OrdinalIgnoreCase) ||
+            valueString.EndsWith("llu", StringComparison.OrdinalIgnoreCase))
         {
-            valueString = valueString[0..^2] + "UL";
+            valueString = valueString[0..^3] + "UL";
         }
-        else if (valueString.EndsWith('l') || valueString.EndsWith('L'))
+        else if (valueString.EndsWith("ll", StringComparison.OrdinalIgnoreCase))
+        {
+            valueString = valueString[0..^2] + "L";
+        }
+        else if (
+            valueString.EndsWith("ul", StringComparison.OrdinalIgnoreCase) ||
+            valueString.EndsWith("lu", StringComparison.OrdinalIgnoreCase))
         {
-            valueString = valueString[0..^1] + "L";
+            valueString = valueString[0..^2] + "U";
         }
         else if (valueString.EndsWith('u') || valueString.EndsWith('U'))
         {
             valueString = valueString[0..^1] + "U";
         }
-
+        else if (valueString.EndsWith('l') || valueString.EndsWith('L'))
+        {
+            valueString = valueString[0..^1];
+        }
+        
         var outputBuilder = StartCSharpCode();
         outputBuilder.Write(valueString);
         StopCSharpCode();

tests/ClangSharp.PInvokeGenerator.UnitTests/Base/VarDeclarationTest.cs

@@ -31,6 +31,7 @@ public abstract class VarDeclarationTest : PInvokeGeneratorTest
     [TestCase("0U", "uint", "0U")]
     [TestCase("0LL", "long", "0L")]
     [TestCase("0ULL", "ulong", "0UL")]
+    [TestCase("0LLU", "ulong", "0UL")]
     [TestCase("0.0", "double", "0.0")]
     [TestCase("0.f", "float", "0.0f")]
     public Task MacroTest(string nativeValue, string expectedManagedType, string expectedManagedValue) => MacroTestImpl(nativeValue, expectedManagedType, expectedManagedValue);