From fedf343aabbb582d6c264494627b3a581c23193b Mon Sep 17 00:00:00 2001
From: Tristan Labelle <git@tristanlabelle.com>
Date: Tue, 17 Oct 2023 06:14:25 -0400
Subject: [PATCH] Added a getter for System's GuidAttribute

---
 Sources/DotNetMetadata/SystemAttributes.swift | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/Sources/DotNetMetadata/SystemAttributes.swift b/Sources/DotNetMetadata/SystemAttributes.swift
index bbeca7c..3a81405 100644
--- a/Sources/DotNetMetadata/SystemAttributes.swift
+++ b/Sources/DotNetMetadata/SystemAttributes.swift
@@ -44,10 +44,20 @@ public enum SystemAttributes {
         let arguments = try attribute.arguments
         guard arguments.count == 1,
             case .constant(let constant) = arguments[0],
-            case .boolean(let value) = constant else {
-            throw InvalidMetadataError.attributeArguments
+            case .boolean(let value) = constant else { throw InvalidMetadataError.attributeArguments }
+
+        return value
+    }
+
+    public static func getGuid(_ type: TypeDefinition) throws -> String? {
+        guard let attribute = try type.firstAttribute(namespace: "System.Runtime.InteropServices", name: "GuidAttribute") else {
+            return nil
         }
 
+        let arguments = try attribute.arguments
+        guard arguments.count == 1,
+            case .constant(let constant) = arguments[0],
+            case .string(let value) = constant else { throw InvalidMetadataError.attributeArguments }
         return value
     }
 }
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