Compare updated template evaluator (#4092)

src/Sdk/WorkflowParser/ObjectTemplating/Tokens/ScalarToken.cs

@@ -0,0 +1,34 @@
+#nullable disable // Consider removing in the future to minimize likelihood of NullReferenceException; refer https://learn.microsoft.com/en-us/dotnet/csharp/nullable-references
+
+using System;
+
+namespace GitHub.Actions.WorkflowParser.ObjectTemplating.Tokens
+{
+    public abstract class ScalarToken : TemplateToken
+    {
+        protected ScalarToken(
+            Int32 type,
+            Int32? fileId,
+            Int32? line,
+            Int32? column)
+            : base(type, fileId, line, column)
+        {
+        }
+
+        public virtual String ToDisplayString()
+        {
+            return TrimDisplayString(ToString());
+        }
+
+        protected String TrimDisplayString(String displayString)
+        {
+            var firstLine = displayString.TrimStart(' ', '\t', '\r', '\n');
+            var firstNewLine = firstLine.IndexOfAny(new[] { '\r', '\n' });
+            if (firstNewLine >= 0)
+            {
+                firstLine = firstLine.Substring(0, firstNewLine);
+            }
+            return firstLine;
+        }
+    }
+}