From 5763e959f6a2233c21f184557bf5879962f826bf Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@freecad.org>
Date: Thu, 20 Mar 2025 16:16:58 +0100
Subject: [PATCH] Sheet: Improve handling of unsupported formulas

With the example file of issue 20299 the parser stops with an exception
and reads in the formulas only partially. This PR doesn't fix the issue
but avoids to raise an exception so that as much as possible will be
read in. For unsupported formulas a suitable message is printed with
the content of the cell.
---
 src/Mod/Spreadsheet/importXLSX.py | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/Mod/Spreadsheet/importXLSX.py b/src/Mod/Spreadsheet/importXLSX.py
index 6c28188544..2fb7dc4f42 100644
--- a/src/Mod/Spreadsheet/importXLSX.py
+++ b/src/Mod/Spreadsheet/importXLSX.py
@@ -346,9 +346,18 @@ def handleCells(cellList, actCellSheet, sList):
         formulaRef = cell.getElementsByTagName("f")
         if len(formulaRef) == 1:
             theFormula = getText(formulaRef[0].childNodes)
-            # print("theFormula: ", theFormula)
-            fTrans = FormulaTranslator()
-            actCellSheet.set(ref, fTrans.translateForm(theFormula))
+            if theFormula:
+                # print("theFormula: ", theFormula)
+                fTrans = FormulaTranslator()
+                actCellSheet.set(ref, fTrans.translateForm(theFormula))
+            else:
+                attrs = formulaRef[0].attributes
+                attrRef = attrs.getNamedItem("t")
+                attrName = getText(attrRef.childNodes)
+                indexRef = attrs.getNamedItem("si")
+                indexName = getText(indexRef.childNodes)
+                content = "<f t='{}' si='{}'/>".format(attrName, indexName)
+                print(f"Unsupported formula in cell {ref}: {content}")
 
         else:
             valueRef = cell.getElementsByTagName("v")