Compare updated template evaluator (#4092)

src/Sdk/WorkflowParser/Conversion/YamlObjectWriter.cs

@@ -0,0 +1,73 @@
+using System;
+using System.Globalization;
+using System.IO;
+using GitHub.Actions.WorkflowParser.ObjectTemplating;
+using YamlDotNet.Core.Events;
+
+namespace GitHub.Actions.WorkflowParser.Conversion
+{
+    /// <summary>
+    /// Converts a TemplateToken into YAML
+    /// </summary>
+    internal sealed class YamlObjectWriter : IObjectWriter
+    {
+        internal YamlObjectWriter(StringWriter writer)
+        {
+            m_emitter = new YamlDotNet.Core.Emitter(writer);
+        }
+
+        public void WriteString(String value)
+        {
+            m_emitter.Emit(new Scalar(value ?? String.Empty));
+        }
+
+        public void WriteBoolean(Boolean value)
+        {
+            m_emitter.Emit(new Scalar(value ? "true" : "false"));
+        }
+
+        public void WriteNumber(Double value)
+        {
+            m_emitter.Emit(new Scalar(value.ToString("G15", CultureInfo.InvariantCulture)));
+        }
+
+        public void WriteNull()
+        {
+            m_emitter.Emit(new Scalar("null"));
+        }
+
+        public void WriteSequenceStart()
+        {
+            m_emitter.Emit(new SequenceStart(null, null, true, SequenceStyle.Block));
+        }
+
+        public void WriteSequenceEnd()
+        {
+            m_emitter.Emit(new SequenceEnd());
+        }
+
+        public void WriteMappingStart()
+        {
+            m_emitter.Emit(new MappingStart());
+        }
+
+        public void WriteMappingEnd()
+        {
+            m_emitter.Emit(new MappingEnd());
+        }
+
+        public void WriteStart()
+        {
+            m_emitter.Emit(new StreamStart());
+            m_emitter.Emit(new DocumentStart());
+        }
+
+        public void WriteEnd()
+        {
+            m_emitter.Emit(new DocumentEnd(isImplicit: true));
+            m_emitter.Emit(new StreamEnd());
+        }
+
+        private readonly YamlDotNet.Core.IEmitter m_emitter;
+    }
+}