From 098d689750f825733c8bd9ea202b197ef6515146 Mon Sep 17 00:00:00 2001
From: Devin Bidwell <dbidwell94@biddydev.com>
Date: Thu, 11 Dec 2025 17:14:43 -0700
Subject: [PATCH] wip -- source mapping overrides in-game line error number

---
 csharp_mod/GlobalCode.cs | 27 +++++++++++++++++++++++++++
 csharp_mod/Patches.cs    | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+)

diff --git a/csharp_mod/GlobalCode.cs b/csharp_mod/GlobalCode.cs
index f472821..14f3c23 100644
--- a/csharp_mod/GlobalCode.cs
+++ b/csharp_mod/GlobalCode.cs
@@ -15,6 +15,9 @@ public static class GlobalCode
     // so that save file data is smaller
     private static Dictionary<Guid, string> codeDict = new();
 
+    // This Dictionary stores the source maps for the given SLANG_REF, where
+    // the key is the IC10 line, and the value is a List of Slang ranges where that
+    // line would have come from
     private static Dictionary<Guid, Dictionary<uint, List<Range>>> sourceMaps = new();
 
     public static void ClearCache()
@@ -38,6 +41,30 @@ public static class GlobalCode
         sourceMaps[reference] = builtDictionary;
     }
 
+    public static bool GetSlangErrorLineFromICError(
+        Guid reference,
+        uint icErrorLine,
+        out uint slangSrc
+    )
+    {
+        slangSrc = icErrorLine;
+
+        if (!sourceMaps.ContainsKey(reference))
+        {
+            return false;
+        }
+
+        var foundRange = sourceMaps[reference][icErrorLine];
+
+        if (foundRange is null)
+        {
+            return false;
+        }
+
+        slangSrc = foundRange[0].StartLine;
+        return true;
+    }
+
     public static string GetSource(Guid reference)
     {
         if (!codeDict.ContainsKey(reference))
diff --git a/csharp_mod/Patches.cs b/csharp_mod/Patches.cs
index d878f97..ea5169f 100644
--- a/csharp_mod/Patches.cs
+++ b/csharp_mod/Patches.cs
@@ -141,6 +141,39 @@ public static class SlangPatches
         chipData.SourceCode = code;
     }
 
+    [HarmonyPatch(
+        typeof(ProgrammableChip),
+        nameof(ProgrammableChip.ErrorLineNumberString),
+        MethodType.Getter
+    )]
+    [HarmonyPostfix]
+    public static void pgc_ErrorLineNumberString(ProgrammableChip __instance, ref string __result)
+    {
+        if (
+            String.IsNullOrEmpty(__result)
+            || __result.LastIndexOf(GlobalCode.SLANG_REF) < 0
+            || !Guid.TryParse(
+                __result
+                    .Substring(
+                        __result.LastIndexOf(GlobalCode.SLANG_REF) + GlobalCode.SLANG_REF.Length
+                    )
+                    .Trim(),
+                out var slangGuid
+            )
+            || !uint.TryParse(__result.Trim(), out var ic10ErrorLineNumber)
+            || !GlobalCode.GetSlangErrorLineFromICError(
+                slangGuid,
+                ic10ErrorLineNumber,
+                out var slangErrorLineNumber
+            )
+        )
+        {
+            return;
+        }
+
+        __result = slangErrorLineNumber.ToString();
+    }
+
     [HarmonyPatch(
         typeof(ProgrammableChipMotherboard),
         nameof(ProgrammableChipMotherboard.SerializeSave)