fix adding of heading 4

src/book.py

@@ -510,6 +510,15 @@ class Book:
         title = re.sub(r'^(?:[A-Za-z]\. ?)+', '', title)
         return title.strip()
 
+    def _preprocessing_headings(self):
+        """
+        Function to convert all lower level headings to p tags
+        """
+        header_tags = self.body_tag.find_all(re.compile("^h[4-6]$"))
+        for tag in header_tags:
+            tag.name = 'p'
+            print(tag)
+
     def _process_headings(self):
         """
         Function to process tags <h>.
@@ -526,11 +535,18 @@ class Book:
             if title == "":
                 tag.unwrap()
             else:
-                if tag.name in ["h4", "h5", "h6"]:  # All the lower level headings will be transformed to h3 headings
-                    tag.name = "h3"
+                assert tag.name not in ["h4", "h5", "h6"], 'Preprocessing went wrong, there is still h4-h6 headings.'
+                # if tag.name in ["h4", "h5", "h6"]:
+                #     tag.name = "h3" # All the lower level headings will be transformed to h3 headings
+
 
                 new_tag = BeautifulSoup(features='lxml').new_tag(name=tag.name)
                 new_tag.string = title
+                if new_tag.name == "p":
+                    new_tag.attrs = tag.attrs
+                    print(tag)
+                    print(new_tag)
+
                 tag.replace_with(new_tag)
 
     def write_html_from_list(self, file_name='url_test.html'):
@@ -553,6 +569,7 @@ class Book:
 
             # process main elements of the .html doc
             self.log(f'Processing main elements of html.')
+            self._preprocessing_headings()
             self._process_paragraph()
             self._process_two_columns()
             self._process_quotes()
@@ -694,6 +711,10 @@ class Book:
             with codecs.open(self.output_path, 'w', encoding='utf-8') as f:
                 json.dump(self.content_dict, f, ensure_ascii=False)
             self.log('Data has been saved to .json file.')
+
+            from pprint import pprint
+
+            pprint(self.content_dict)
         except Exception as exc:
             self.log('Error has occurred while writing json file.', logging.ERROR)
             # self.log_error_to_main_log()