BUG : cope with extra space

closes py-pdf#1903

pypdf/_writer.py

@@ -862,6 +862,7 @@ def _update_text_field(self, field: DictionaryObject) -> None:
  # Extract font information
  da = cast(str, field[AA.DA])
  font_properties = da.replace("\n", " ").replace("\r", " ").split(" ")
+ font_properties = [x for x in font_properties if x != ""]
  font_name = font_properties[font_properties.index("Tf") - 2]
  font_height = float(font_properties[font_properties.index("Tf") - 1])
  if font_height == 0:

tests/test_writer.py

@@ -1783,3 +1783,17 @@ def test_viewerpreferences():
  assert reader.viewer_preferences is None
  writer = PdfWriter(clone_from=reader)
  assert writer.viewer_preferences is None
+
+
+def test_extra_spaces_in_da_text(caplog):
+ writer = PdfWriter(clone_from=RESOURCE_ROOT / "form.pdf")
+ t = writer.pages[0]["/Annots"][0].get_object()["/DA"]
+ t = t.replace("/Helv", "/Helv ")
+ writer.pages[0]["/Annots"][0].get_object()[NameObject("/DA")] = TextStringObject(t)
+ writer.update_page_form_field_values(
+ writer.pages[0], {"foo": "abcd"}, auto_regenerate=False
+ )
+ t = writer.pages[0]["/Annots"][0].get_object()["/AP"]["/N"].get_data()
+ assert "Font dictionary for not found." not in caplog.text
+ assert b"/Helv" in t
+ assert b"(abcd)" in t