From 0bbb460d18b6289991d589a77beee60354e13aa4 Mon Sep 17 00:00:00 2001
From: Harbor404 <2657212322@qq.com>
Date: Fri, 2 Oct 2026 01:50:32 +0800
Subject: [PATCH] fix(pptx): preserve soft line breaks with link formats

---
 haystack/components/converters/pptx.py          |  8 +++++++-
 ...-pptx-soft-line-breaks-97f4237b1266d42f.yaml |  6 ++++++
 .../converters/test_pptx_to_document.py         | 17 +++++++++++++++++
 3 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 releasenotes/notes/fix-pptx-soft-line-breaks-97f4237b1266d42f.yaml

diff --git a/haystack/components/converters/pptx.py b/haystack/components/converters/pptx.py
index f4d9fed086a..2ec673c332c 100644
--- a/haystack/components/converters/pptx.py
+++ b/haystack/components/converters/pptx.py
@@ -101,7 +101,13 @@ def _process_paragraph(self, paragraph: "_Paragraph") -> str:
         if self.link_format == "none":
             return paragraph.text
         parts = []
-        for run in paragraph.runs:
+        runs = {run._r: run for run in paragraph.runs}
+        for content in paragraph._element.content_children:
+            run = runs.get(content)
+            if run is None:
+                if content.text == "\v":
+                    parts.append("\v")
+                continue
             if run.hyperlink and run.hyperlink.address:
                 if self.link_format == "markdown":
                     parts.append(f"[{run.text}]({run.hyperlink.address})")
diff --git a/releasenotes/notes/fix-pptx-soft-line-breaks-97f4237b1266d42f.yaml b/releasenotes/notes/fix-pptx-soft-line-breaks-97f4237b1266d42f.yaml
new file mode 100644
index 00000000000..7f435f7d93b
--- /dev/null
+++ b/releasenotes/notes/fix-pptx-soft-line-breaks-97f4237b1266d42f.yaml
@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixed ``PPTXToDocument`` dropping soft line breaks from paragraphs when ``link_format`` is
+    ``"markdown"`` or ``"plain"``. Soft line breaks are now preserved as vertical tabs
+    (``"\v"``), matching the behavior of the default ``"none"`` format.
diff --git a/test/components/converters/test_pptx_to_document.py b/test/components/converters/test_pptx_to_document.py
index 647a2a35719..679bf0a4782 100644
--- a/test/components/converters/test_pptx_to_document.py
+++ b/test/components/converters/test_pptx_to_document.py
@@ -2,11 +2,14 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
+import io
 import logging
 import os
 from pathlib import Path
 
 import pytest
+from pptx import Presentation
+from pptx.util import Inches
 
 from haystack.components.converters.pptx import PPTXToDocument
 from haystack.dataclasses import ByteStream
@@ -123,3 +126,17 @@ def test_no_link_extraction(self, test_files_path):
 
         assert "https://example.com" not in content
         assert "Example" in content
+
+    @pytest.mark.parametrize("link_format", ["markdown", "plain"])
+    def test_soft_line_break_preserved(self, link_format):
+        presentation = Presentation()
+        slide = presentation.slides.add_slide(presentation.slide_layouts[6])
+        text_frame = slide.shapes.add_textbox(Inches(1), Inches(1), Inches(7), Inches(2)).text_frame
+        text_frame.text = "Account: Alice\vBalance: 100"
+        buffer = io.BytesIO()
+        presentation.save(buffer)
+
+        converter = PPTXToDocument(link_format=link_format)
+        output = converter.run(sources=[ByteStream(data=buffer.getvalue())])
+
+        assert output["documents"][0].content == "Account: Alice\vBalance: 100"