Config option: strip-enum-member-type-name

README.md

@@ -256,6 +256,10 @@ Options:
   generate-unmanaged-constants           Unmanaged constants should be generated using static ref readonly properties. This is currently experimental.
   generate-vtbl-index-attribute          [VtblIndex(#)] attribute should be generated to document the underlying VTBL index for a helper method.
 
+  # Stripping Options
+
+  strip-enum-member-type-name            Strips the enum type name from the beginning of its member names.
+
   # Logging Options
 
   log-exclusions                         A list of excluded declaration types should be generated. This will also log if the exclusion was due to an exact or partial match.

sources/ClangSharp.PInvokeGenerator/PInvokeGenerator.VisitDecl.cs

@@ -7,6 +7,7 @@
 using System.Linq;
 using System.Runtime.InteropServices;
 using System.Text;
+using System.Text.RegularExpressions;
 using ClangSharp.Abstractions;
 using ClangSharp.CSharp;
 using static ClangSharp.Interop.CX_CastKind;
@@ -294,6 +295,11 @@ private void VisitEnumConstantDecl(EnumConstantDecl enumConstantDecl)
             parentName = _outputBuilder.Name;
         }
 
+        if (Config.StripEnumMemberTypeName)
+        {
+            escapedName = PrefixAndStrip(escapedName, parentName, trimChar: '_');
+        }
+
         var kind = isAnonymousEnum ? ValueKind.Primitive : ValueKind.Enumerator;
         var flags = ValueFlags.Constant;
 
@@ -535,12 +541,12 @@ private void VisitFunctionDecl(FunctionDecl functionDecl)
         if ((cxxMethodDecl is not null) && cxxMethodDecl.IsVirtual)
         {
             isVirtual = true;
-            escapedName = PrefixAndStripName(name, GetOverloadIndex(cxxMethodDecl));
+            escapedName = PrefixAndStripMethodName(name, GetOverloadIndex(cxxMethodDecl));
         }
         else
         {
             isVirtual = false;
-            escapedName = EscapeAndStripName(name);
+            escapedName = EscapeAndStripMethodName(name);
         }
 
         var returnType = functionDecl.ReturnType;
@@ -2024,7 +2030,7 @@ void OutputMarkerInterface(CXXRecordDecl cxxRecordDecl, CXXMethodDecl cxxMethodD
 
             var desc = new FunctionOrDelegateDesc {
                 AccessSpecifier = AccessSpecifier.Public,
-                EscapedName = EscapeAndStripName(name),
+                EscapedName = EscapeAndStripMethodName(name),
                 IsMemberFunction = true,
                 NativeTypeName = nativeTypeName,
                 HasFnPtrCodeGen = !_config.ExcludeFnptrCodegen,
@@ -2112,7 +2118,7 @@ void OutputVtblEntry(CXXRecordDecl cxxRecordDecl, CXXMethodDecl cxxMethodDecl)
             }
 
             var remappedName = FixupNameForMultipleHits(cxxMethodDecl);
-            var escapedName = EscapeAndStripName(remappedName);
+            var escapedName = EscapeAndStripMethodName(remappedName);
 
             var desc = new FieldDesc
             {
@@ -2181,7 +2187,7 @@ void OutputVtblHelperMethod(CXXRecordDecl cxxRecordDecl, CXXMethodDecl cxxMethod
             var desc = new FunctionOrDelegateDesc {
                 AccessSpecifier = AccessSpecifier.Public,
                 IsAggressivelyInlined = _config.GenerateAggressiveInlining,
-                EscapedName = EscapeAndStripName(name),
+                EscapedName = EscapeAndStripMethodName(name),
                 ParentName = parentName,
                 IsMemberFunction = true,
                 IsInherited = isInherited,
@@ -2261,7 +2267,7 @@ void OutputVtblHelperMethod(CXXRecordDecl cxxRecordDecl, CXXMethodDecl cxxMethod
             {
                 body.Write("Marshal.GetDelegateForFunctionPointer<");
                 body.BeginMarker("delegate");
-                body.Write(PrefixAndStripName(name, GetOverloadIndex(cxxMethodDecl)));
+                body.Write(PrefixAndStripMethodName(name, GetOverloadIndex(cxxMethodDecl)));
                 body.EndMarker("delegate");
                 body.Write(">(");
             }
@@ -2270,7 +2276,7 @@ void OutputVtblHelperMethod(CXXRecordDecl cxxRecordDecl, CXXMethodDecl cxxMethod
             {
                 body.Write("lpVtbl->");
                 body.BeginMarker("vtbl", new KeyValuePair<string, object>("explicit", true));
-                body.Write(EscapeAndStripName(remappedName));
+                body.Write(EscapeAndStripMethodName(remappedName));
                 body.EndMarker("vtbl");
             }
             else

sources/ClangSharp.PInvokeGenerator/PInvokeGenerator.VisitStmt.cs

@@ -970,7 +970,7 @@ private void VisitDeclRefExpr(DeclRefExpr declRefExpr)
 
             if (declRefExpr.Decl is FunctionDecl)
             {
-                escapedName = EscapeAndStripName(name);
+                escapedName = EscapeAndStripMethodName(name);
             }
         }
 

sources/ClangSharp.PInvokeGenerator/PInvokeGenerator.cs

@@ -1454,18 +1454,18 @@ static void GenerateTransparentStructs(PInvokeGenerator generator, Stream? strea
                 return type.Contains('*', StringComparison.Ordinal)
                      ? (8, 4, +1)
                      : type switch {
-                        "sbyte" => (1, 1, -1),
-                        "byte" => (1, 1, +1),
-                        "short" => (2, 2, -1),
-                        "ushort" => (2, 2, +1),
-                        "int" => (4, 4, -1),
-                        "uint" => (4, 4, +1),
-                        "nint" => (8, 4, -1),
-                        "nuint" => (8, 4, +1),
-                        "long" => (8, 8, -1),
-                        "ulong" => (8, 8, +1),
-                        _ => (0, 0, 0),
-                    };
+                         "sbyte" => (1, 1, -1),
+                         "byte" => (1, 1, +1),
+                         "short" => (2, 2, -1),
+                         "ushort" => (2, 2, +1),
+                         "int" => (4, 4, -1),
+                         "uint" => (4, 4, +1),
+                         "nint" => (8, 4, -1),
+                         "nuint" => (8, 4, +1),
+                         "long" => (8, 8, -1),
+                         "ulong" => (8, 8, +1),
+                         _ => (0, 0, 0),
+                     };
             }
 
             static void OutputConversions(StreamWriter sw, string indentString, string name, string type, PInvokeGeneratorTransparentStructKind kind, string target)
@@ -2326,13 +2326,9 @@ private static string EscapeName(string name)
         }
     }
 
-    private string EscapeAndStripName(string name)
+    private string EscapeAndStripMethodName(string name)
     {
-        if (name.StartsWith(_config.MethodPrefixToStrip, StringComparison.Ordinal))
-        {
-            name = name[_config.MethodPrefixToStrip.Length..];
-        }
-
+        name = PrefixAndStrip(name, _config.MethodPrefixToStrip);
         return EscapeName(name);
     }
 
@@ -5407,7 +5403,7 @@ private static bool IsTransparentStructBoolean(PInvokeGeneratorTransparentStruct
         => kind is PInvokeGeneratorTransparentStructKind.Boolean;
 
     private static bool IsTransparentStructHandle(PInvokeGeneratorTransparentStructKind kind)
-         =>  kind is PInvokeGeneratorTransparentStructKind.Handle
+         => kind is PInvokeGeneratorTransparentStructKind.Handle
                   or PInvokeGeneratorTransparentStructKind.HandleWin32;
 
     private static bool IsTransparentStructHexBased(PInvokeGeneratorTransparentStructKind kind)
@@ -6153,7 +6149,7 @@ private bool NeedsReturnFixup(CXXMethodDecl cxxMethodDecl)
 
     private static bool NeedsNewKeyword(string name)
     {
-        return name.Equals("Equals",StringComparison.Ordinal)
+        return name.Equals("Equals", StringComparison.Ordinal)
             || name.Equals("GetHashCode", StringComparison.Ordinal)
             || name.Equals("GetType", StringComparison.Ordinal)
             || name.Equals("MemberwiseClone", StringComparison.Ordinal)
@@ -6198,13 +6194,32 @@ private void ParenthesizeStmt(Stmt stmt)
         }
     }
 
-    private string PrefixAndStripName(string name, uint overloadIndex)
+    /// <summary>
+    /// Checks whether the specified name starts with a prefix, optionally trims a separator character following the prefix and returns the remainder.
+    /// </summary>
+    /// <param name="name">The name to strip.</param>
+    /// <param name="prefix">The prefix to strip from <paramref name="name"/>.</param>
+    /// <param name="trimChar">Additional separator that may follow <paramref name="prefix"/> which should also be trimmed away.</param>
+    /// <returns>
+    /// <paramref name="name"/> if it does not start with <paramref name="prefix"/>;
+    /// otherwise,
+    /// the remainder of <paramref name="name"/> after stripping <paramref name="prefix"/> and all immediate following occurences of <paramref name="trimChar"/> from it beginning.
+    /// </returns>
+    private static string PrefixAndStrip(string name, string prefix, char trimChar = '\0')
     {
-        if (name.StartsWith(_config.MethodPrefixToStrip, StringComparison.Ordinal))
+        var nameSpan = name.AsSpan();
+        if (nameSpan.StartsWith(prefix, StringComparison.Ordinal))
         {
-            name = name[_config.MethodPrefixToStrip.Length..];
+            nameSpan = nameSpan[prefix.Length..];
+            nameSpan = nameSpan.TrimStart(trimChar);
+            return nameSpan.ToString();
         }
+        return name;
+    }
 
+    private string PrefixAndStripMethodName(string name, uint overloadIndex)
+    {
+        name = PrefixAndStrip(name, _config.MethodPrefixToStrip);
         return $"_{name}{((overloadIndex != 0) ? overloadIndex.ToString(CultureInfo.InvariantCulture) : "")}";
     }
 

sources/ClangSharp.PInvokeGenerator/PInvokeGeneratorConfiguration.cs

@@ -265,6 +265,8 @@ public IReadOnlyCollection<string> ExcludedNames
 
     public bool GenerateVtblIndexAttribute => _options.HasFlag(PInvokeGeneratorConfigurationOptions.GenerateVtblIndexAttribute);
 
+    public bool StripEnumMemberTypeName => _options.HasFlag(PInvokeGeneratorConfigurationOptions.StripEnumMemberTypeName);
+
     public string HeaderText => _headerText;
 
     [AllowNull]

sources/ClangSharp.PInvokeGenerator/PInvokeGeneratorConfigurationOptions.cs

@@ -86,4 +86,6 @@ public enum PInvokeGeneratorConfigurationOptions : long
     GenerateCallConvMemberFunction = 1L << 37,
 
     GenerateGenericPointerWrapper = 1L << 38,
+
+    StripEnumMemberTypeName = 1L << 39,
 }

sources/ClangSharpPInvokeGenerator/Program.cs

@@ -177,6 +177,12 @@ public static class Program
         new TwoColumnHelpRow("generate-unmanaged-constants", "Unmanaged constants should be generated using static ref readonly properties. This is currently experimental."),
         new TwoColumnHelpRow("generate-vtbl-index-attribute", "[VtblIndex(#)] attribute should be generated to document the underlying VTBL index for a helper method."),
 
+        new TwoColumnHelpRow("", ""),
+        new TwoColumnHelpRow("# Stripping Options", ""),
+        new TwoColumnHelpRow("", ""),
+
+        new TwoColumnHelpRow("strip-enum-member-type-name", "Strips the enum type name from the beginning of its member names."),
+
         new TwoColumnHelpRow("", ""),
         new TwoColumnHelpRow("# Logging Options", ""),
         new TwoColumnHelpRow("", ""),
@@ -617,6 +623,14 @@ public static void Run(InvocationContext context)
                     break;
                 }
 
+                // Strip Options
+
+                case "strip-enum-member-type-name":
+                {
+                    configOptions |= PInvokeGeneratorConfigurationOptions.StripEnumMemberTypeName;
+                    break;
+                }
+
                 // Legacy Options
 
                 case "default-remappings":