From 65519b08ca1301d783097a6d70186ebd4be9561a Mon Sep 17 00:00:00 2001
From: Michele Dolfi <dol@zurich.ibm.com>
Date: Fri, 31 Jan 2025 17:03:56 +0100
Subject: [PATCH] markdown placeholder

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>
---
 docling_core/types/doc/document.py | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/docling_core/types/doc/document.py b/docling_core/types/doc/document.py
index cfa82c4..b0e1007 100644
--- a/docling_core/types/doc/document.py
+++ b/docling_core/types/doc/document.py
@@ -2227,11 +2227,18 @@ def _append_text(text: str, do_escape_html=True, do_escape_underscores=True):
 
             elif isinstance(item, TextItem) and item.label in [DocItemLabel.FORMULA]:
                 in_list = False
-                _append_text(
-                    f"$${item.text}$$\n",
-                    do_escape_underscores=False,
-                    do_escape_html=False,
-                )
+                if item.text != "":
+                    _append_text(
+                        f"$${item.text}$$\n",
+                        do_escape_underscores=False,
+                        do_escape_html=False,
+                    )
+                elif item.orig != "":
+                    _append_text(
+                        "<!-- formula-not-decoded -->\n",
+                        do_escape_underscores=False,
+                        do_escape_html=False,
+                    )
 
             elif isinstance(item, TextItem) and item.label in labels:
                 in_list = False