1 files changed, 100 insertions, 0 deletions
diff --git a/src/SMAPI/Patches/DialogueErrorPatch.cs b/src/SMAPI/Patches/DialogueErrorPatch.cs
new file mode 100644
index 00000000..d8905fd1
--- /dev/null
+++ b/src/SMAPI/Patches/DialogueErrorPatch.cs
@@ -0,0 +1,100 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Reflection;
+using Harmony;
+using StardewModdingAPI.Framework.Patching;
+using StardewModdingAPI.Framework.Reflection;
+using StardewValley;
+
+namespace StardewModdingAPI.Patches
+{
+    /// <summary>A Harmony patch for the <see cref="Dialogue"/> constructor which intercepts invalid dialogue lines and logs an error instead of crashing.</summary>
+    internal class DialogueErrorPatch : IHarmonyPatch
+    {
+        /*********
+        ** Private methods
+        *********/
+        /// <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 Reflector Reflection;
+
+
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>A unique name for this patch.</summary>
+        public string Name => $"{nameof(DialogueErrorPatch)}";
+
+
+        /*********
+        ** 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 DialogueErrorPatch(IMonitor monitorForGame, Reflector reflector)
+        {
+            DialogueErrorPatch.MonitorForGame = monitorForGame;
+            DialogueErrorPatch.Reflection = reflector;
+        }
+
+
+        /// <summary>Apply the Harmony patch.</summary>
+        /// <param name="harmony">The Harmony instance.</param>
+        public void Apply(HarmonyInstance harmony)
+        {
+            ConstructorInfo constructor = AccessTools.Constructor(typeof(Dialogue), new[] { typeof(string), typeof(NPC) });
+            MethodInfo prefix = AccessTools.Method(this.GetType(), nameof(DialogueErrorPatch.Prefix));
+
+            harmony.Patch(constructor, new HarmonyMethod(prefix), null);
+        }
+
+
+        /*********
+        ** Private methods
+        *********/
+        /// <summary>The method to call instead of the Dialogue constructor.</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>
+        /// <returns>Returns whether to execute the original method.</returns>
+        /// <remarks>This method must be static for Harmony to work correctly. See the Harmony documentation before renaming arguments.</remarks>
+        [SuppressMessage("ReSharper", "InconsistentNaming", Justification = "Argument names are defined by Harmony.")]
+        private static bool Prefix(Dialogue __instance, string masterDialogue, NPC speaker)
+        {
+            // get private members
+            bool nameArraysTranslated = DialogueErrorPatch.Reflection.GetField<bool>(typeof(Dialogue), "nameArraysTranslated").GetValue();
+            IReflectedMethod translateArraysOfStrings = DialogueErrorPatch.Reflection.GetMethod(typeof(Dialogue), "TranslateArraysOfStrings");
+            IReflectedMethod parseDialogueString = DialogueErrorPatch.Reflection.GetMethod(__instance, "parseDialogueString");
+            IReflectedMethod checkForSpecialDialogueAttributes = DialogueErrorPatch.Reflection.GetMethod(__instance, "checkForSpecialDialogueAttributes");
+            IReflectedField<List<string>> dialogues = DialogueErrorPatch.Reflection.GetField<List<string>>(__instance, "dialogues");
+
+            // replicate base constructor
+            if (dialogues.GetValue() == null)
+                dialogues.SetValue(new List<string>());
+
+            // duplicate code with try..catch
+            try
+            {
+                if (!nameArraysTranslated)
+                    translateArraysOfStrings.Invoke();
+                __instance.speaker = speaker;
+                parseDialogueString.Invoke(masterDialogue);
+                checkForSpecialDialogueAttributes.Invoke();
+            }
+            catch (Exception baseEx) when (baseEx.InnerException is TargetInvocationException invocationEx && invocationEx.InnerException is Exception ex)
+            {
+                string name = !string.IsNullOrWhiteSpace(speaker?.Name) ? speaker.Name : null;
+                DialogueErrorPatch.MonitorForGame.Log($"Failed parsing dialogue string{(name != null ? $" for {name}" : "")}:\n{masterDialogue}\n{ex}", LogLevel.Error);
+
+                parseDialogueString.Invoke("...");
+                checkForSpecialDialogueAttributes.Invoke();
+            }
+
+            return false;
+        }
+    }
+}