1 files changed, 121 insertions, 0 deletions
diff --git a/src/SMAPI/Framework/Serialisation/Converters/SFieldConverter.cs b/src/SMAPI/Framework/Serialisation/Converters/SFieldConverter.cs
new file mode 100644
index 00000000..69353491
--- /dev/null
+++ b/src/SMAPI/Framework/Serialisation/Converters/SFieldConverter.cs
@@ -0,0 +1,121 @@
+using System;
+using System.Collections.Generic;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using StardewModdingAPI.Framework.Exceptions;
+using StardewModdingAPI.Framework.Models;
+
+namespace StardewModdingAPI.Framework.Serialisation.Converters
+{
+    /// <summary>Overrides how SMAPI reads and writes <see cref="ISemanticVersion"/> and <see cref="IManifestDependency"/> fields.</summary>
+    internal class SFieldConverter : 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[])
+                || objectType == typeof(ModDataID)
+                || objectType == typeof(ModCompatibility[]);
+        }
+
+        /// <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))
+            {
+                JToken token = JToken.Load(reader);
+                switch (token.Type)
+                {
+                    case JTokenType.Object:
+                        {
+                            JObject obj = (JObject)token;
+                            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 LegacyManifestVersion(major, minor, patch, build);
+                        }
+
+                    case JTokenType.String:
+                        {
+                            string str = token.Value<string>();
+                            if (string.IsNullOrWhiteSpace(str))
+                                return null;
+                            if (!SemanticVersion.TryParse(str, out ISemanticVersion version))
+                                throw new SParseException($"Can't parse semantic version from invalid value '{str}', should be formatted like 1.2, 1.2.30, or 1.2.30-beta.");
+                            return version;
+                        }
+
+                    default:
+                        throw new SParseException($"Can't parse semantic version from {token.Type}, must be an object or string.");
+                }
+            }
+
+            // manifest dependencies
+            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));
+                    string minVersion = obj.Value<string>(nameof(IManifestDependency.MinimumVersion));
+                    bool required = obj.Value<bool?>(nameof(IManifestDependency.IsRequired)) ?? true;
+                    result.Add(new ManifestDependency(uniqueID, minVersion, required));
+                }
+                return result.ToArray();
+            }
+
+            // mod data ID
+            if (objectType == typeof(ModDataID))
+            {
+                JToken token = JToken.Load(reader);
+                return new ModDataID(token.Value<string>());
+            }
+
+            // mod compatibility records
+            if (objectType == typeof(ModCompatibility[]))
+            {
+                List<ModCompatibility> result = new List<ModCompatibility>();
+                foreach (JProperty property in JObject.Load(reader).Properties())
+                {
+                    string range = property.Name;
+                    ModStatus status = (ModStatus)Enum.Parse(typeof(ModStatus), property.Value.Value<string>(nameof(ModCompatibility.Status)));
+                    string reasonPhrase = property.Value.Value<string>(nameof(ModCompatibility.ReasonPhrase));
+
+                    result.Add(new ModCompatibility(range, status, reasonPhrase));
+                }
+                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.");
+        }
+    }
+}