diff --git a/Source/UI/Layout/SnapRectangle.cpp b/Source/UI/Layout/SnapRectangle.cpp
index 96286a62..ecd3214c 100644
--- a/Source/UI/Layout/SnapRectangle.cpp
+++ b/Source/UI/Layout/SnapRectangle.cpp
@@ -1,5 +1,9 @@
 #include "UI/Layout/SnapRectangle.h"
 
+#include "Utility/Text/TextTokens.h"
+
+#include <cstdlib>
+#include <cstring>
 #include <utility>
 
 namespace {
@@ -95,3 +99,27 @@ void SnapRectangle::Snap(const SnapRectangle& other, int& dx, int& dy) const {
     }
   }
 }
+
+// OFFSET: 0x009B5140
+// FUNCTION: fn_13837
+int ParseItemIdTag(const char* text, const char* end, int& length, int& itemId) {
+  if (std::strncmp(text, "^nItemID^", 9) != 0) {
+    return 0;
+  }
+
+  unsigned int digits = 0;
+  while (text + digits < end && g_colorHexDigit[static_cast<signed char>(text[9 + digits])] != 0) {
+    ++digits;
+  }
+
+  if (digits == 0) {
+    return 0;
+  }
+
+  char number[10];
+  std::strncpy(number, text + 9, digits);
+  number[digits] = '\0';
+  length = digits + 9;
+  itemId = std::atoi(number);
+  return 1;
+}