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Scripts/Utilities/ExpressionParser/Sprache/ResultHelper.cs

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+using System;
+
+namespace Sprache
+{
+    internal static class ResultHelper
+    {
+        public static IResult<U> IfSuccess<T, U>(this IResult<T> result, Func<IResult<T>, IResult<U>> next)
+        {
+            if(result == null) throw new ArgumentNullException(nameof(result));
+
+            if (result.WasSuccessful)
+                return next(result);
+
+            return Result.Failure<U>(result.Remainder, result.Message, result.Expectations);
+        }
+
+        public static IResult<T> IfFailure<T>(this IResult<T> result, Func<IResult<T>, IResult<T>> next)
+        {
+            if (result == null) throw new ArgumentNullException(nameof(result));
+
+            return result.WasSuccessful 
+                ? result 
+                : next(result);
+        }
+    }
+}