1 files changed, 72 insertions, 0 deletions
diff --git a/src/StardewModdingAPI/Framework/Serialisation/ManifestFieldConverter.cs b/src/StardewModdingAPI/Framework/Serialisation/ManifestFieldConverter.cs
new file mode 100644
index 00000000..6b5a6aaa
--- /dev/null
+++ b/src/StardewModdingAPI/Framework/Serialisation/ManifestFieldConverter.cs
@@ -0,0 +1,72 @@
+using System;
+using System.Collections.Generic;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using StardewModdingAPI.Framework.Models;
+
+namespace StardewModdingAPI.Framework.Serialisation
+{
+    /// <summary>Overrides how SMAPI reads and writes <see cref="ISemanticVersion"/> and <see cref="IManifestDependency"/> fields.</summary>
+    internal class ManifestFieldConverter : JsonConverter
+    {
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>Whether this converter can write JSON.</summary>
+        public override bool CanWrite => false;
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Get whether this instance can convert the specified object type.</summary>
+        /// <param name="objectType">The object type.</param>
+        public override bool CanConvert(Type objectType)
+        {
+            return objectType == typeof(ISemanticVersion) || objectType == typeof(IManifestDependency[]);
+        }
+
+        /// <summary>Reads the JSON representation of the object.</summary>
+        /// <param name="reader">The JSON reader.</param>
+        /// <param name="objectType">The object type.</param>
+        /// <param name="existingValue">The object being read.</param>
+        /// <param name="serializer">The calling serializer.</param>
+        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        {
+            // semantic version
+            if (objectType == typeof(ISemanticVersion))
+            {
+                JObject obj = JObject.Load(reader);
+                int major = obj.Value<int>(nameof(ISemanticVersion.MajorVersion));
+                int minor = obj.Value<int>(nameof(ISemanticVersion.MinorVersion));
+                int patch = obj.Value<int>(nameof(ISemanticVersion.PatchVersion));
+                string build = obj.Value<string>(nameof(ISemanticVersion.Build));
+                return new SemanticVersion(major, minor, patch, build);
+            }
+
+            // manifest dependency
+            if (objectType == typeof(IManifestDependency[]))
+            {
+                List<IManifestDependency> result = new List<IManifestDependency>();
+                foreach (JObject obj in JArray.Load(reader).Children<JObject>())
+                {
+                    string uniqueID = obj.Value<string>(nameof(IManifestDependency.UniqueID));
+                    result.Add(new ManifestDependency(uniqueID));
+                }
+                return result.ToArray();
+            }
+
+            // unknown
+            throw new NotSupportedException($"Unknown type '{objectType?.FullName}'.");
+        }
+
+        /// <summary>Writes the JSON representation of the object.</summary>
+        /// <param name="writer">The JSON writer.</param>
+        /// <param name="value">The value.</param>
+        /// <param name="serializer">The calling serializer.</param>
+        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+        {
+            throw new InvalidOperationException("This converter does not write JSON.");
+        }
+    }
+}