From 0b836095319ebf2133c4a3a77602718034915e55 Mon Sep 17 00:00:00 2001
From: Rafael Teixeira de Lima <Rafael.td.lima@gmail.com>
Date: Thu, 24 Jul 2025 11:02:24 +0200
Subject: [PATCH] fix(docx): Adding plain latex equations to table cells
 (#1986)

* Adding plain latex equations to table cells

Signed-off-by: Rafael Teixeira de Lima <Rafael.td.lima@gmail.com>

* Adding test files

Signed-off-by: Rafael Teixeira de Lima <Rafael.td.lima@gmail.com>

---------

Signed-off-by: Rafael Teixeira de Lima <Rafael.td.lima@gmail.com>
---
 docling/backend/msword_backend.py             |  11 +-
 tests/data/docx/table_with_equations.docx     | Bin 0 -> 14228 bytes
 .../docling_v2/table_with_equations.docx.itxt |   3 +
 .../docling_v2/table_with_equations.docx.json | 174 ++++++++++++++++++
 .../docling_v2/table_with_equations.docx.md   |   3 +
 5 files changed, 190 insertions(+), 1 deletion(-)
 create mode 100644 tests/data/docx/table_with_equations.docx
 create mode 100644 tests/data/groundtruth/docling_v2/table_with_equations.docx.itxt
 create mode 100644 tests/data/groundtruth/docling_v2/table_with_equations.docx.json
 create mode 100644 tests/data/groundtruth/docling_v2/table_with_equations.docx.md

diff --git a/docling/backend/msword_backend.py b/docling/backend/msword_backend.py
index abbcc6f6..45c53a98 100644
--- a/docling/backend/msword_backend.py
+++ b/docling/backend/msword_backend.py
@@ -1104,8 +1104,17 @@ class MsWordDocumentBackend(DeclarativeDocumentBackend):
                     )
                 _log.debug(f"  spanned before row {spanned_idx}")
 
+                # Detect equations in cell text
+                text, equations = self._handle_equations_in_text(
+                    element=cell._element, text=cell.text
+                )
+                if len(equations) == 0:
+                    text = cell.text
+                else:
+                    text = text.replace("<eq>", "$").replace("</eq>", "$")
+
                 table_cell = TableCell(
-                    text=cell.text,
+                    text=text,
                     row_span=spanned_idx - row_idx,
                     col_span=cell.grid_span,
                     start_row_offset_idx=row.grid_cols_before + row_idx,
diff --git a/tests/data/docx/table_with_equations.docx b/tests/data/docx/table_with_equations.docx
new file mode 100644
index 0000000000000000000000000000000000000000..151c03b247dafb0d4e4d65fd576e711f2b24b3aa
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diff --git a/tests/data/groundtruth/docling_v2/table_with_equations.docx.itxt b/tests/data/groundtruth/docling_v2/table_with_equations.docx.itxt
new file mode 100644
index 00000000..8b54db7c
--- /dev/null
+++ b/tests/data/groundtruth/docling_v2/table_with_equations.docx.itxt
@@ -0,0 +1,3 @@
+item-0 at level 0: unspecified: group _root_
+  item-1 at level 1: table with [2x2]
+  item-2 at level 1: paragraph: 
\ No newline at end of file
diff --git a/tests/data/groundtruth/docling_v2/table_with_equations.docx.json b/tests/data/groundtruth/docling_v2/table_with_equations.docx.json
new file mode 100644
index 00000000..fc8f9780
--- /dev/null
+++ b/tests/data/groundtruth/docling_v2/table_with_equations.docx.json
@@ -0,0 +1,174 @@
+{
+  "schema_name": "DoclingDocument",
+  "version": "1.5.0",
+  "name": "table_with_equations",
+  "origin": {
+    "mimetype": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+    "binary_hash": 6528760837820727976,
+    "filename": "table_with_equations.docx"
+  },
+  "furniture": {
+    "self_ref": "#/furniture",
+    "children": [],
+    "content_layer": "furniture",
+    "name": "_root_",
+    "label": "unspecified"
+  },
+  "body": {
+    "self_ref": "#/body",
+    "children": [
+      {
+        "$ref": "#/tables/0"
+      },
+      {
+        "$ref": "#/texts/0"
+      }
+    ],
+    "content_layer": "body",
+    "name": "_root_",
+    "label": "unspecified"
+  },
+  "groups": [],
+  "texts": [
+    {
+      "self_ref": "#/texts/0",
+      "parent": {
+        "$ref": "#/body"
+      },
+      "children": [],
+      "content_layer": "body",
+      "label": "paragraph",
+      "prov": [],
+      "orig": "",
+      "text": ""
+    }
+  ],
+  "pictures": [],
+  "tables": [
+    {
+      "self_ref": "#/tables/0",
+      "parent": {
+        "$ref": "#/body"
+      },
+      "children": [],
+      "content_layer": "body",
+      "label": "table",
+      "prov": [],
+      "captions": [],
+      "references": [],
+      "footnotes": [],
+      "data": {
+        "table_cells": [
+          {
+            "row_span": 1,
+            "col_span": 1,
+            "start_row_offset_idx": 0,
+            "end_row_offset_idx": 1,
+            "start_col_offset_idx": 0,
+            "end_col_offset_idx": 1,
+            "text": "The next cell has an equation",
+            "column_header": true,
+            "row_header": false,
+            "row_section": false
+          },
+          {
+            "row_span": 1,
+            "col_span": 1,
+            "start_row_offset_idx": 0,
+            "end_row_offset_idx": 1,
+            "start_col_offset_idx": 1,
+            "end_col_offset_idx": 2,
+            "text": "$A= \\pi r^{2}$",
+            "column_header": true,
+            "row_header": false,
+            "row_section": false
+          },
+          {
+            "row_span": 1,
+            "col_span": 1,
+            "start_row_offset_idx": 1,
+            "end_row_offset_idx": 2,
+            "start_col_offset_idx": 0,
+            "end_col_offset_idx": 1,
+            "text": "The next cell has another equation",
+            "column_header": false,
+            "row_header": false,
+            "row_section": false
+          },
+          {
+            "row_span": 1,
+            "col_span": 1,
+            "start_row_offset_idx": 1,
+            "end_row_offset_idx": 2,
+            "start_col_offset_idx": 1,
+            "end_col_offset_idx": 2,
+            "text": "$x=\\frac{-b \\pm \\sqrt{b^{2}-4ac}}{2a}$",
+            "column_header": false,
+            "row_header": false,
+            "row_section": false
+          }
+        ],
+        "num_rows": 2,
+        "num_cols": 2,
+        "grid": [
+          [
+            {
+              "row_span": 1,
+              "col_span": 1,
+              "start_row_offset_idx": 0,
+              "end_row_offset_idx": 1,
+              "start_col_offset_idx": 0,
+              "end_col_offset_idx": 1,
+              "text": "The next cell has an equation",
+              "column_header": true,
+              "row_header": false,
+              "row_section": false
+            },
+            {
+              "row_span": 1,
+              "col_span": 1,
+              "start_row_offset_idx": 0,
+              "end_row_offset_idx": 1,
+              "start_col_offset_idx": 1,
+              "end_col_offset_idx": 2,
+              "text": "$A= \\pi r^{2}$",
+              "column_header": true,
+              "row_header": false,
+              "row_section": false
+            }
+          ],
+          [
+            {
+              "row_span": 1,
+              "col_span": 1,
+              "start_row_offset_idx": 1,
+              "end_row_offset_idx": 2,
+              "start_col_offset_idx": 0,
+              "end_col_offset_idx": 1,
+              "text": "The next cell has another equation",
+              "column_header": false,
+              "row_header": false,
+              "row_section": false
+            },
+            {
+              "row_span": 1,
+              "col_span": 1,
+              "start_row_offset_idx": 1,
+              "end_row_offset_idx": 2,
+              "start_col_offset_idx": 1,
+              "end_col_offset_idx": 2,
+              "text": "$x=\\frac{-b \\pm \\sqrt{b^{2}-4ac}}{2a}$",
+              "column_header": false,
+              "row_header": false,
+              "row_section": false
+            }
+          ]
+        ]
+      },
+      "annotations": []
+    }
+  ],
+  "key_value_items": [],
+  "form_items": [],
+  "pages": {}
+}
\ No newline at end of file
diff --git a/tests/data/groundtruth/docling_v2/table_with_equations.docx.md b/tests/data/groundtruth/docling_v2/table_with_equations.docx.md
new file mode 100644
index 00000000..837e6550
--- /dev/null
+++ b/tests/data/groundtruth/docling_v2/table_with_equations.docx.md
@@ -0,0 +1,3 @@
+| The next cell has an equation      | $A= \pi r^{2}$                         |
+|------------------------------------|----------------------------------------|
+| The next cell has another equation | $x=\frac{-b \pm \sqrt{b^{2}-4ac}}{2a}$ |
\ No newline at end of file