6 files changed, 90 insertions, 22 deletions
diff --git a/src/SMAPI/Framework/ContentCoordinator.cs b/src/SMAPI/Framework/ContentCoordinator.cs
index d9b2109a..9eb7b5f9 100644
--- a/src/SMAPI/Framework/ContentCoordinator.cs
+++ b/src/SMAPI/Framework/ContentCoordinator.cs
@@ -9,6 +9,7 @@ using StardewModdingAPI.Framework.Content;
 using StardewModdingAPI.Framework.ContentManagers;
 using StardewModdingAPI.Framework.Reflection;
 using StardewModdingAPI.Metadata;
+using StardewModdingAPI.Toolkit.Serialisation;
 using StardewModdingAPI.Toolkit.Utilities;
 using StardewValley;
 
@@ -32,6 +33,9 @@ namespace StardewModdingAPI.Framework
         /// <summary>Simplifies access to private code.</summary>
         private readonly Reflector Reflection;
 
+        /// <summary>Encapsulates SMAPI's JSON file parsing.</summary>
+        private readonly JsonHelper JsonHelper;
+
         /// <summary>The loaded content managers (including the <see cref="MainContentManager"/>).</summary>
         private readonly IList<IContentManager> ContentManagers = new List<IContentManager>();
 
@@ -67,10 +71,12 @@ namespace StardewModdingAPI.Framework
         /// <param name="currentCulture">The current culture for which to localise content.</param>
         /// <param name="monitor">Encapsulates monitoring and logging.</param>
         /// <param name="reflection">Simplifies access to private code.</param>
-        public ContentCoordinator(IServiceProvider serviceProvider, string rootDirectory, CultureInfo currentCulture, IMonitor monitor, Reflector reflection)
+        /// <param name="jsonHelper">Encapsulates SMAPI's JSON file parsing.</param>
+        public ContentCoordinator(IServiceProvider serviceProvider, string rootDirectory, CultureInfo currentCulture, IMonitor monitor, Reflector reflection, JsonHelper jsonHelper)
         {
             this.Monitor = monitor ?? throw new ArgumentNullException(nameof(monitor));
             this.Reflection = reflection;
+            this.JsonHelper = jsonHelper;
             this.FullRootDirectory = Path.Combine(Constants.ExecutionPath, rootDirectory);
             this.ContentManagers.Add(
                 this.MainContentManager = new GameContentManager("Game1.content", serviceProvider, rootDirectory, currentCulture, this, monitor, reflection, this.OnDisposing)
@@ -92,7 +98,7 @@ namespace StardewModdingAPI.Framework
         /// <param name="rootDirectory">The root directory to search for content (or <c>null</c> for the default).</param>
         public ModContentManager CreateModContentManager(string name, string rootDirectory)
         {
-            ModContentManager manager = new ModContentManager(name, this.MainContentManager.ServiceProvider, rootDirectory, this.MainContentManager.CurrentCulture, this, this.Monitor, this.Reflection, this.OnDisposing);
+            ModContentManager manager = new ModContentManager(name, this.MainContentManager.ServiceProvider, rootDirectory, this.MainContentManager.CurrentCulture, this, this.Monitor, this.Reflection, this.JsonHelper, this.OnDisposing);
             this.ContentManagers.Add(manager);
             return manager;
         }
diff --git a/src/SMAPI/Framework/ContentManagers/ModContentManager.cs b/src/SMAPI/Framework/ContentManagers/ModContentManager.cs
index 80bf37e9..24ce69ea 100644
--- a/src/SMAPI/Framework/ContentManagers/ModContentManager.cs
+++ b/src/SMAPI/Framework/ContentManagers/ModContentManager.cs
@@ -5,6 +5,7 @@ using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
 using StardewModdingAPI.Framework.Exceptions;
 using StardewModdingAPI.Framework.Reflection;
+using StardewModdingAPI.Toolkit.Serialisation;
 using StardewValley;
 
 namespace StardewModdingAPI.Framework.ContentManagers
@@ -13,6 +14,13 @@ namespace StardewModdingAPI.Framework.ContentManagers
     internal class ModContentManager : BaseContentManager
     {
         /*********
+        ** Properties
+        *********/
+        /// <summary>Encapsulates SMAPI's JSON file parsing.</summary>
+        private readonly JsonHelper JsonHelper;
+
+
+        /*********
         ** Public methods
         *********/
         /// <summary>Construct an instance.</summary>
@@ -23,9 +31,13 @@ namespace StardewModdingAPI.Framework.ContentManagers
         /// <param name="coordinator">The central coordinator which manages content managers.</param>
         /// <param name="monitor">Encapsulates monitoring and logging.</param>
         /// <param name="reflection">Simplifies access to private code.</param>
+        /// <param name="jsonHelper">Encapsulates SMAPI's JSON file parsing.</param>
         /// <param name="onDisposing">A callback to invoke when the content manager is being disposed.</param>
-        public ModContentManager(string name, IServiceProvider serviceProvider, string rootDirectory, CultureInfo currentCulture, ContentCoordinator coordinator, IMonitor monitor, Reflector reflection, Action<BaseContentManager> onDisposing)
-                : base(name, serviceProvider, rootDirectory, currentCulture, coordinator, monitor, reflection, onDisposing, isModFolder: true) { }
+        public ModContentManager(string name, IServiceProvider serviceProvider, string rootDirectory, CultureInfo currentCulture, ContentCoordinator coordinator, IMonitor monitor, Reflector reflection, JsonHelper jsonHelper, Action<BaseContentManager> onDisposing)
+            : base(name, serviceProvider, rootDirectory, currentCulture, coordinator, monitor, reflection, onDisposing, isModFolder: true)
+        {
+            this.JsonHelper = jsonHelper;
+        }
 
         /// <summary>Load an asset that has been processed by the content pipeline.</summary>
         /// <typeparam name="T">The type of asset to load.</typeparam>
@@ -95,9 +107,14 @@ namespace StardewModdingAPI.Framework.ContentManagers
                     case ".xnb":
                         return base.Load<T>(relativePath, language);
 
-                    // unpacked map
-                    case ".tbin":
-                        throw GetContentError($"can't read unpacked map file directly from the underlying content manager. It must be loaded through the mod's {typeof(IModHelper)}.{nameof(IModHelper.Content)} helper.");
+                    // unpacked data
+                    case ".json":
+                        {
+                            if (!this.JsonHelper.ReadJsonFileIfExists(file.FullName, out T data))
+                                throw GetContentError("the JSON file is invalid."); // should never happen since we check for file existence above
+
+                            return data;
+                        }
 
                     // unpacked image
                     case ".png":
@@ -114,6 +131,10 @@ namespace StardewModdingAPI.Framework.ContentManagers
                             return (T)(object)texture;
                         }
 
+                    // unpacked map
+                    case ".tbin":
+                        throw GetContentError($"can't read unpacked map file directly from the underlying content manager. It must be loaded through the mod's {typeof(IModHelper)}.{nameof(IModHelper.Content)} helper.");
+
                     default:
                         throw GetContentError($"unknown file extension '{file.Extension}'; must be one of '.png', '.tbin', or '.xnb'.");
                 }
diff --git a/src/SMAPI/Framework/ContentPack.cs b/src/SMAPI/Framework/ContentPack.cs
index 4a4adb90..62d8b80d 100644
--- a/src/SMAPI/Framework/ContentPack.cs
+++ b/src/SMAPI/Framework/ContentPack.cs
@@ -54,7 +54,9 @@ namespace StardewModdingAPI.Framework
         public TModel ReadJsonFile<TModel>(string path) where TModel : class
         {
             path = Path.Combine(this.DirectoryPath, PathUtilities.NormalisePathSeparators(path));
-            return this.JsonHelper.ReadJsonFile<TModel>(path);
+            return this.JsonHelper.ReadJsonFileIfExists(path, out TModel model)
+                ? model
+                : null;
         }
 
         /// <summary>Load content from the content pack folder (if not already cached), and return it. When loading a <c>.png</c> file, this must be called outside the game's draw loop.</summary>
diff --git a/src/SMAPI/Framework/ModHelpers/ModHelper.cs b/src/SMAPI/Framework/ModHelpers/ModHelper.cs
index d9498e83..0ba258b4 100644
--- a/src/SMAPI/Framework/ModHelpers/ModHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/ModHelper.cs
@@ -138,7 +138,9 @@ namespace StardewModdingAPI.Framework.ModHelpers
             where TModel : class
         {
             path = Path.Combine(this.DirectoryPath, PathUtilities.NormalisePathSeparators(path));
-            return this.JsonHelper.ReadJsonFile<TModel>(path);
+            return this.JsonHelper.ReadJsonFileIfExists(path, out TModel data)
+                ? data
+                : null;
         }
 
         /// <summary>Save to a JSON file.</summary>
diff --git a/src/SMAPI/Framework/SGame.cs b/src/SMAPI/Framework/SGame.cs
index 05fedc3d..83e8c9a7 100644
--- a/src/SMAPI/Framework/SGame.cs
+++ b/src/SMAPI/Framework/SGame.cs
@@ -17,6 +17,7 @@ using StardewModdingAPI.Framework.Input;
 using StardewModdingAPI.Framework.Reflection;
 using StardewModdingAPI.Framework.StateTracking;
 using StardewModdingAPI.Framework.Utilities;
+using StardewModdingAPI.Toolkit.Serialisation;
 using StardewValley;
 using StardewValley.BellsAndWhistles;
 using StardewValley.Buildings;
@@ -37,16 +38,6 @@ namespace StardewModdingAPI.Framework
         ** Properties
         *********/
         /****
-        ** Constructor hack
-        ****/
-        /// <summary>A static instance of <see cref="Monitor"/> to use while <see cref="Game1"/> is initialising, which happens before the <see cref="SGame"/> constructor runs.</summary>
-        internal static IMonitor MonitorDuringInitialisation;
-
-        /// <summary>A static instance of <see cref="Reflection"/> to use while <see cref="Game1"/> is initialising, which happens before the <see cref="SGame"/> constructor runs.</summary>
-        internal static Reflector ReflectorDuringInitialisation;
-
-
-        /****
         ** SMAPI state
         ****/
         /// <summary>Encapsulates monitoring and logging.</summary>
@@ -83,6 +74,9 @@ namespace StardewModdingAPI.Framework
         /// <summary>Simplifies access to private game code.</summary>
         private readonly Reflector Reflection;
 
+        /// <summary>Encapsulates SMAPI's JSON file parsing.</summary>
+        private readonly JsonHelper JsonHelper;
+
         /****
         ** Game state
         ****/
@@ -105,6 +99,9 @@ namespace StardewModdingAPI.Framework
         /*********
         ** Accessors
         *********/
+        /// <summary>Static state to use while <see cref="Game1"/> is initialising, which happens before the <see cref="SGame"/> constructor runs.</summary>
+        internal static SGameConstructorHack ConstructorHack { get; set; }
+
         /// <summary>SMAPI's content manager.</summary>
         public ContentCoordinator ContentCore { get; private set; }
 
@@ -132,10 +129,13 @@ namespace StardewModdingAPI.Framework
         /// <param name="monitor">Encapsulates monitoring and logging.</param>
         /// <param name="reflection">Simplifies access to private game code.</param>
         /// <param name="eventManager">Manages SMAPI events for mods.</param>
+        /// <param name="jsonHelper">Encapsulates SMAPI's JSON file parsing.</param>
         /// <param name="onGameInitialised">A callback to invoke after the game finishes initialising.</param>
         /// <param name="onGameExiting">A callback to invoke when the game exits.</param>
-        internal SGame(IMonitor monitor, Reflector reflection, EventManager eventManager, Action onGameInitialised, Action onGameExiting)
+        internal SGame(IMonitor monitor, Reflector reflection, EventManager eventManager, JsonHelper jsonHelper, Action onGameInitialised, Action onGameExiting)
         {
+            SGame.ConstructorHack = null;
+
             // check expectations
             if (this.ContentCore == null)
                 throw new InvalidOperationException($"The game didn't initialise its first content manager before SMAPI's {nameof(SGame)} constructor. This indicates an incompatible lifecycle change.");
@@ -147,6 +147,7 @@ namespace StardewModdingAPI.Framework
             this.Monitor = monitor;
             this.Events = eventManager;
             this.Reflection = reflection;
+            this.JsonHelper = jsonHelper;
             this.OnGameInitialised = onGameInitialised;
             this.OnGameExiting = onGameExiting;
             Game1.input = new SInputState();
@@ -191,8 +192,7 @@ namespace StardewModdingAPI.Framework
             // NOTE: this method is called before the SGame constructor runs. Don't depend on anything being initialised at this point.
             if (this.ContentCore == null)
             {
-                this.ContentCore = new ContentCoordinator(serviceProvider, rootDirectory, Thread.CurrentThread.CurrentUICulture, SGame.MonitorDuringInitialisation, SGame.ReflectorDuringInitialisation);
-                SGame.MonitorDuringInitialisation = null;
+                this.ContentCore = new ContentCoordinator(serviceProvider, rootDirectory, Thread.CurrentThread.CurrentUICulture, SGame.ConstructorHack.Monitor, SGame.ConstructorHack.Reflection, SGame.ConstructorHack.JsonHelper);
                 this.NextContentManagerIsMain = true;
                 return this.ContentCore.CreateGameContentManager("Game1._temporaryContent");
             }
diff --git a/src/SMAPI/Framework/SGameConstructorHack.cs b/src/SMAPI/Framework/SGameConstructorHack.cs
new file mode 100644
index 00000000..494bab99
--- /dev/null
+++ b/src/SMAPI/Framework/SGameConstructorHack.cs
@@ -0,0 +1,37 @@
+using StardewModdingAPI.Framework.Reflection;
+using StardewModdingAPI.Toolkit.Serialisation;
+using StardewValley;
+
+namespace StardewModdingAPI.Framework
+{
+    /// <summary>The static state to use while <see cref="Game1"/> is initialising, which happens before the <see cref="SGame"/> constructor runs.</summary>
+    internal class SGameConstructorHack
+    {
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>Encapsulates monitoring and logging.</summary>
+        public IMonitor Monitor { get; }
+
+        /// <summary>Simplifies access to private game code.</summary>
+        public Reflector Reflection { get; }
+
+        /// <summary>Encapsulates SMAPI's JSON file parsing.</summary>
+        public JsonHelper JsonHelper { get; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="monitor">Encapsulates monitoring and logging.</param>
+        /// <param name="reflection">Simplifies access to private game code.</param>
+        /// <param name="jsonHelper">Encapsulates SMAPI's JSON file parsing.</param>
+        public SGameConstructorHack(IMonitor monitor, Reflector reflection, JsonHelper jsonHelper)
+        {
+            this.Monitor = monitor;
+            this.Reflection = reflection;
+            this.JsonHelper = jsonHelper;
+        }
+    }
+}