Support H6

Author: realanthonyc

app/epub2txt.js

@@ -47,7 +47,7 @@ document.addEventListener('DOMContentLoaded', () => {
         H5: 5,
         H6: 6
     };
-    const MAX_HEADING_LEVEL = 5;
+    const MAX_HEADING_LEVEL = 6;
 
     // UI Elements
     const dropZone = document.getElementById('drop-zone');

epub2txt.py

@@ -62,7 +62,7 @@
     'h5': 5,
     'h6': 6
 }
-MAX_HEADING_LEVEL = 5
+MAX_HEADING_LEVEL = 6
 ANCHOR_MARKER_TAG = 'epub2txt-sep'
 
 def resolve_zip_path(base_dir: str, href: str) -> str:

test-data/gen_test_epub.py

@@ -134,6 +134,8 @@ def foo():
   <h3>Subsection A.1</h3>
   <p>Multiple paragraphs should keep blank lines between them.</p>
   <p>Second paragraph in the same section.</p>
+  <h6>Subsection A.1.a (H6)</h6>
+  <p>H6 should render as six hashes in output.</p>
   <figure>
     <img src="../images/cover.svg" alt="Cover"/>
     <figcaption>Figure caption text.</figcaption>