1 files changed, 75 insertions, 0 deletions
diff --git a/src/SMAPI.Mods.ErrorHandler/Patches/DialoguePatcher.cs b/src/SMAPI.Mods.ErrorHandler/Patches/DialoguePatcher.cs
new file mode 100644
index 00000000..7a3af39c
--- /dev/null
+++ b/src/SMAPI.Mods.ErrorHandler/Patches/DialoguePatcher.cs
@@ -0,0 +1,75 @@
+using System;
+using System.Diagnostics.CodeAnalysis;
+using HarmonyLib;
+using StardewModdingAPI.Internal;
+using StardewModdingAPI.Internal.Patching;
+using StardewValley;
+
+namespace StardewModdingAPI.Mods.ErrorHandler.Patches
+{
+    /// <summary>Harmony patches for <see cref="Dialogue"/> which intercept invalid dialogue lines and logs an error instead of crashing.</summary>
+    /// <remarks>Patch methods must be static for Harmony to work correctly. See the Harmony documentation before renaming patch arguments.</remarks>
+    [SuppressMessage("ReSharper", "InconsistentNaming", Justification = "Argument names are defined by Harmony and methods are named for clarity.")]
+    [SuppressMessage("ReSharper", "IdentifierTypo", Justification = "Argument names are defined by Harmony and methods are named for clarity.")]
+    internal class DialoguePatcher : BasePatcher
+    {
+        /*********
+        ** Fields
+        *********/
+        /// <summary>Writes messages to the console and log file on behalf of the game.</summary>
+        private static IMonitor MonitorForGame;
+
+        /// <summary>Simplifies access to private code.</summary>
+        private static IReflectionHelper Reflection;
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="monitorForGame">Writes messages to the console and log file on behalf of the game.</param>
+        /// <param name="reflector">Simplifies access to private code.</param>
+        public DialoguePatcher(IMonitor monitorForGame, IReflectionHelper reflector)
+        {
+            DialoguePatcher.MonitorForGame = monitorForGame;
+            DialoguePatcher.Reflection = reflector;
+        }
+
+        /// <inheritdoc />
+        public override void Apply(Harmony harmony, IMonitor monitor)
+        {
+            harmony.Patch(
+                original: this.RequireConstructor<Dialogue>(typeof(string), typeof(NPC)),
+                finalizer: this.GetHarmonyMethod(nameof(DialoguePatcher.Finalize_Constructor))
+            );
+        }
+
+
+        /*********
+        ** Private methods
+        *********/
+        /// <summary>The method to call when the Dialogue constructor throws an exception.</summary>
+        /// <param name="__instance">The instance being patched.</param>
+        /// <param name="masterDialogue">The dialogue being parsed.</param>
+        /// <param name="speaker">The NPC for which the dialogue is being parsed.</param>
+        /// <param name="__exception">The exception thrown by the wrapped method, if any.</param>
+        /// <returns>Returns the exception to throw, if any.</returns>
+        private static Exception Finalize_Constructor(Dialogue __instance, string masterDialogue, NPC speaker, Exception __exception)
+        {
+            if (__exception != null)
+            {
+                // log message
+                string name = !string.IsNullOrWhiteSpace(speaker?.Name) ? speaker.Name : null;
+                DialoguePatcher.MonitorForGame.Log($"Failed parsing dialogue string{(name != null ? $" for {name}" : "")}:\n{masterDialogue}\n{__exception.GetLogSummary()}", LogLevel.Error);
+
+                // set default dialogue
+                IReflectedMethod parseDialogueString = DialoguePatcher.Reflection.GetMethod(__instance, "parseDialogueString");
+                IReflectedMethod checkForSpecialDialogueAttributes = DialoguePatcher.Reflection.GetMethod(__instance, "checkForSpecialDialogueAttributes");
+                parseDialogueString.Invoke("...");
+                checkForSpecialDialogueAttributes.Invoke();
+            }
+
+            return null;
+        }
+    }
+}