Compare updated template evaluator (#4092)

src/Sdk/Expressions/Data/ExpressionDataJsonConverter.cs

@@ -0,0 +1,199 @@
+#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;
+using System.Collections.Generic;
+using System.Reflection;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace GitHub.Actions.Expressions.Data
+{
+    /// <summary>
+    /// JSON serializer for ExpressionData objects
+    /// </summary>
+    internal sealed class ExpressionDataJsonConverter : JsonConverter
+    {
+        public override Boolean CanWrite
+        {
+            get
+            {
+                return true;
+            }
+        }
+
+        public override Boolean CanConvert(Type objectType)
+        {
+            return typeof(ExpressionData).GetTypeInfo().IsAssignableFrom(objectType.GetTypeInfo());
+        }
+
+        public override Object ReadJson(
+            JsonReader reader,
+            Type objectType,
+            Object existingValue,
+            JsonSerializer serializer)
+        {
+            switch (reader.TokenType)
+            {
+                case JsonToken.String:
+                    return new StringExpressionData(reader.Value.ToString());
+
+                case JsonToken.Boolean:
+                    return new BooleanExpressionData((Boolean)reader.Value);
+
+                case JsonToken.Float:
+                    return new NumberExpressionData((Double)reader.Value);
+
+                case JsonToken.Integer:
+                    return new NumberExpressionData((Double)(Int64)reader.Value);
+
+                case JsonToken.StartObject:
+                    break;
+
+                default:
+                    return null;
+            }
+
+            Int32? type = null;
+            JObject value = JObject.Load(reader);
+            if (!value.TryGetValue("t", StringComparison.OrdinalIgnoreCase, out JToken typeValue))
+            {
+                type = ExpressionDataType.String;
+            }
+            else if (typeValue.Type == JTokenType.Integer)
+            {
+                type = (Int32)typeValue;
+            }
+            else
+            {
+                return existingValue;
+            }
+
+            Object newValue = null;
+            switch (type)
+            {
+                case ExpressionDataType.String:
+                    newValue = new StringExpressionData(null);
+                    break;
+
+                case ExpressionDataType.Array:
+                    newValue = new ArrayExpressionData();
+                    break;
+
+                case ExpressionDataType.Dictionary:
+                    newValue = new DictionaryExpressionData();
+                    break;
+
+                case ExpressionDataType.Boolean:
+                    newValue = new BooleanExpressionData(false);
+                    break;
+
+                case ExpressionDataType.Number:
+                    newValue = new NumberExpressionData(0);
+                    break;
+
+                case ExpressionDataType.CaseSensitiveDictionary:
+                    newValue = new CaseSensitiveDictionaryExpressionData();
+                    break;
+
+                default:
+                    throw new NotSupportedException($"Unexpected {nameof(ExpressionDataType)} '{type}'");
+            }
+
+            if (value != null)
+            {
+                using JsonReader objectReader = value.CreateReader();
+                serializer.Populate(objectReader, newValue);
+            }
+
+            return newValue;
+        }
+
+        public override void WriteJson(
+            JsonWriter writer,
+            Object value,
+            JsonSerializer serializer)
+        {
+            if (Object.ReferenceEquals(value, null))
+            {
+                writer.WriteNull();
+            }
+            else if (value is StringExpressionData stringData)
+            {
+                writer.WriteValue(stringData.Value);
+            }
+            else if (value is BooleanExpressionData boolData)
+            {
+                writer.WriteValue(boolData.Value);
+            }
+            else if (value is NumberExpressionData numberData)
+            {
+                writer.WriteValue(numberData.Value);
+            }
+            else if (value is ArrayExpressionData arrayData)
+            {
+                writer.WriteStartObject();
+                writer.WritePropertyName("t");
+                writer.WriteValue(ExpressionDataType.Array);
+                if (arrayData.Count > 0)
+                {
+                    writer.WritePropertyName("a");
+                    writer.WriteStartArray();
+                    foreach (var item in arrayData)
+                    {
+                        serializer.Serialize(writer, item);
+                    }
+                    writer.WriteEndArray();
+                }
+                writer.WriteEndObject();
+            }
+            else if (value is DictionaryExpressionData dictionaryData)
+            {
+                writer.WriteStartObject();
+                writer.WritePropertyName("t");
+                writer.WriteValue(ExpressionDataType.Dictionary);
+                if (dictionaryData.Count > 0)
+                {
+                    writer.WritePropertyName("d");
+                    writer.WriteStartArray();
+                    foreach (var pair in dictionaryData)
+                    {
+                        writer.WriteStartObject();
+                        writer.WritePropertyName("k");
+                        writer.WriteValue(pair.Key);
+                        writer.WritePropertyName("v");
+                        serializer.Serialize(writer, pair.Value);
+                        writer.WriteEndObject();
+                    }
+                    writer.WriteEndArray();
+                }
+                writer.WriteEndObject();
+            }
+            else if (value is CaseSensitiveDictionaryExpressionData caseSensitiveDictionaryData)
+            {
+                writer.WriteStartObject();
+                writer.WritePropertyName("t");
+                writer.WriteValue(ExpressionDataType.CaseSensitiveDictionary);
+                if (caseSensitiveDictionaryData.Count > 0)
+                {
+                    writer.WritePropertyName("d");
+                    writer.WriteStartArray();
+                    foreach (var pair in caseSensitiveDictionaryData)
+                    {
+                        writer.WriteStartObject();
+                        writer.WritePropertyName("k");
+                        writer.WriteValue(pair.Key);
+                        writer.WritePropertyName("v");
+                        serializer.Serialize(writer, pair.Value);
+                        writer.WriteEndObject();
+                    }
+                    writer.WriteEndArray();
+                }
+                writer.WriteEndObject();
+            }
+            else
+            {
+                throw new NotSupportedException($"Unexpected type '{value.GetType().Name}'");
+            }
+        }
+    }
+}