Pass the MathJax files into the iframe

src/pyj/read_book/db.pyj

@@ -186,10 +186,28 @@ class DB:
             fdata = book.stored_files[key]
             mt = fdata.mimetype or 'application/octet-stream'
             if fdata.encoded:
-                result = Blob([base64decode(fdata)], {'type':mt})
+                result = Blob([base64decode(result)], {'type':mt})
             proceed(result, name, mt, book)
         )
 
+    def get_mathjax_files(self, proceed):
+        c = self.idb.transaction('mathjax').objectStore('mathjax').openCursor()
+        c.onerror = def(event):
+            err = _('Failed to read the MathJax files from local storage')
+            self.display_error(err, event)
+        data = {}
+        c.onsuccess = def(event):
+            cursor = event.target.result
+            if cursor:
+                name, result = cursor.key, cursor.value
+                if not isinstance(result, Blob):
+                    mt = 'application/x-font-woff' if name.endswith('.woff') else 'text/javascript'
+                    result = Blob([base64decode(result)], {'type':mt})
+                data[name] = result
+                cursor.continue()
+            else:
+                proceed(data)
+
 def create_db(ui, interface_data):
     if not window.indexedDB:
         return ui.db_initialized(_('Your browser does not support IndexedDB. Cannot read books. Consider using a modern browser, such as Firefox, Chrome or Edge.'))

src/pyj/read_book/iframe.pyj

@@ -6,6 +6,7 @@ import traceback
 from aes import GCM
 from gettext import install, gettext as _
 from read_book.globals import set_boss, set_current_spine_item, current_layout_mode, current_spine_item, set_layout_mode
+from read_book.mathjax import apply_mathjax
 from read_book.resources import finalize_resources, unserialize_html
 from read_book.flow_mode import flow_to_scroll_fraction, flow_onwheel, flow_onkeydown, layout as flow_layout
 from read_book.paged_mode import layout as paged_layout, scroll_to_fraction as paged_scroll_to_fraction, onwheel as paged_onwheel, onkeydown as paged_onkeydown, scroll_to_elem
@@ -89,10 +90,14 @@ class Boss:
             self.to_scroll_fraction = paged_scroll_to_fraction
         apply_settings(data.settings)
         set_current_spine_item({'name':data.name, 'is_first':index is 0, 'is_last':index is spine.length - 1, 'initial_position':data.initial_position})
-        root_data = finalize_resources(self.book, data.name, data.resource_data)
+        root_data, self.mathjax = finalize_resources(self.book, data.name, data.resource_data)
         unserialize_html(root_data, self.content_loaded)
 
     def content_loaded(self):
+        if self.mathjax:
+            mj = self.mathjax
+            self.mathjax = None
+            return apply_mathjax(mj, self.content_loaded)
         self.connect_links()
         document.documentElement.style.overflow = 'hidden'
         window.addEventListener('scroll', debounce(self.update_cfi, 1000))

src/pyj/read_book/mathjax.pyj

@@ -0,0 +1,7 @@
+# vim:fileencoding=utf-8
+# License: GPL v3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
+from __python__ import hash_literals
+
+def apply_mathjax(mathjax_files):
+    pass
+

src/pyj/read_book/resources.pyj

@@ -26,6 +26,8 @@ def load_resources(db, book, root_name, previous_resources, proceed):
         if not pending_resources.length:
             for k in previous_resources:
                 v'delete previous_resources[k]'
+            if book.manifest.files[root_name].has_maths:
+                return load_mathjax(db, book, ans, proceed)
             proceed(ans)
             return
         name = pending_resources.shift()
@@ -63,10 +65,26 @@ def load_resources(db, book, root_name, previous_resources, proceed):
 
     do_one()
 
+mathjax_data = None
+
+def load_mathjax(db, book, resource_data, proceed):
+    if mathjax_data is None:
+        db.get_mathjax_files(def(data):
+            nonlocal mathjax_data
+            mathjax_data = data
+            resource_data['..mathjax-files..'] = data
+            proceed(resource_data)
+        )
+    else:
+        resource_data['..mathjax-files..'] = mathjax_data
+        proceed(resource_data)
+
 def finalize_resources(book, root_name, resource_data):
     blob_url_map = Object.create(None)
     root_data = None
     link_pat = create_link_pat(book)
+    mathjax = resource_data['..mathjax-files..']
+    v'delete resource_data["..mathjax-files.."]'
 
     # Resolve the non virtualized resources immediately
     for name in resource_data:
@@ -142,7 +160,7 @@ def finalize_resources(book, root_name, resource_data):
         for name in resolved:
             v'delete resource_data[name]'
 
-    return root_data
+    return root_data, mathjax
 
 js_types = set('text/javascript text/ecmascript application/javascript application/ecmascript'.split(' '))
 resource_tag_names = {'script':'src', 'link':'href', 'img':'src', 'image':'xlink:href'}