Simplify loading of MathJax files

src/calibre/gui2/viewer2/web_view.py

@@ -4,7 +4,6 @@
 
 from __future__ import absolute_import, division, print_function, unicode_literals
 
-import json
 import os
 
 from PyQt5.Qt import (
@@ -63,7 +62,7 @@ class UrlSchemeHandler(QWebEngineUrlSchemeHandler):
 
     def __init__(self, parent=None):
         QWebEngineUrlSchemeHandler.__init__(self, parent)
-        self.mathjax_tdir = self.mathjax_manifest = None
+        self.mathjax_tdir = None
 
     def requestStarted(self, rq):
         if bytes(rq.requestMethod()) != b'GET':
@@ -100,18 +99,17 @@ class UrlSchemeHandler(QWebEngineUrlSchemeHandler):
             data = b'[' + manifest + b',' + metadata + b']'
             self.send_reply(rq, mime_type, data)
         elif name.startswith('mathjax/'):
-            if name == 'mathjax/manifest.json':
-                from calibre.srv.books import get_mathjax_manifest
             if self.mathjax_tdir is None:
+                from calibre.srv.books import get_mathjax_manifest
                 self.mathjax_tdir = PersistentTemporaryDirectory(prefix='v2mjx-')
-                    self.mathjax_manifest = json.dumps(get_mathjax_manifest(self.mathjax_tdir)['files'], encoding='utf-8')
-                self.send_reply(rq, 'application/json', self.mathjax_manifest)
-            else:
+                get_mathjax_manifest(self.mathjax_tdir)
+
             path = os.path.abspath(os.path.join(self.mathjax_tdir, name))
             if path.startswith(self.mathjax_tdir):
                 mt = guess_type(name)
                 with lopen(path, 'rb') as f:
-                        self.send_reply(rq, mt, f.read())
+                    raw = f.read()
+                self.send_reply(rq, mt, raw)
 
     def send_reply(self, rq, mime_type, data):
         if sip.isdeleted(rq):

src/pyj/read_book/mathjax.pyj

@@ -4,6 +4,9 @@ from __python__ import hash_literals
 
 from elementmaker import E
 
+from read_book.globals import runtime
+
+
 def get_url(mathjax_files, name):
     ans = mathjax_files[name]
     if not ans:
@@ -58,7 +61,6 @@ def init_mathjax(mathjax_files, link_uid, proceed):
 
 def apply_mathjax(mathjax_files, link_uid, proceed):
     window.MathJax = m = v'{}'
-    m.AuthorInit = init_mathjax.bind(this, mathjax_files, link_uid, proceed)
     m.positionToHash = False
     m.showMathMenu = False
     m.showMathMenuMSIE = False
@@ -67,4 +69,10 @@ def apply_mathjax(mathjax_files, link_uid, proceed):
     m.TeX = v'{}'
     m.TeX.extensions = "AMSmath.js AMSsymbols.js noErrors.js noUndefined.js".split(' ')
     m.CommonHTML = v'{ linebreaks: { automatic: true} }'
-    document.head.appendChild(E.script(type='text/javascript', src=get_url(mathjax_files, 'MathJax.js')))
+    script = E.script(type='text/javascript')
+    document.head.appendChild(script)
+    if runtime.is_standalone_viewer:
+        script.src = f'{runtime.FAKE_PROTOCOL}://{runtime.FAKE_HOST}/mathjax/MathJax.js'
+    else:
+        m.AuthorInit = init_mathjax.bind(this, mathjax_files, link_uid, proceed)
+        script.src = get_url(mathjax_files, 'MathJax.js')

src/pyj/viewer-main.pyj

@@ -18,12 +18,15 @@ from read_book.globals import runtime, ui_operations
 from read_book.iframe import main as iframe_main
 from read_book.view import View
 from session import session_defaults
+from viewer.constants import FAKE_HOST, FAKE_PROTOCOL
 
 
 def container_div(id):
     return E.div(id=id, style='margin: 0; padding: 0; display: none')
 
 runtime.is_standalone_viewer = True
+runtime.FAKE_HOST = FAKE_HOST
+runtime.FAKE_PROTOCOL = FAKE_PROTOCOL
 book = None
 view = None
 
@@ -57,56 +60,8 @@ def get_file(book, name, proceed):
     xhr.send()
 
 
-def mathjax_file_received(name, proceed, end_type, xhr, ev):
-    if end_type is 'abort':
-        return
-    if end_type is not 'load':
-        show_error(_('Failed to load MathJax file'), _(
-            'Could not load the file: {} with error: {}').format(name, xhr.error_html))
-        return
-    if not xhr.responseType or xhr.responseType is 'text':
-        result = xhr.responseText
-    else if xhr.responseType is 'blob' or xhr.responseType is 'json':
-        result = xhr.response
-    else:
-        show_error(_('Failed to load MathJax file'), _(
-            'Could not load the file: {} unknown response type: {}').format(name, xhr.responseType))
-        return
-    if name is 'manifest.json':
-        get_mathjax_files.manifest = result
-        get_mathjax_files_stage2.files_to_get = list(Object.keys(result))
-        get_mathjax_files_stage2.file_data = {}
-        get_mathjax_files_stage2(proceed)
-        return
-
-    get_mathjax_files_stage2.file_data[name] = result
-    get_mathjax_files_stage2.files_to_get.remove(name)
-    if not get_mathjax_files_stage2.files_to_get.length:
-        proceed(get_mathjax_files_stage2.file_data)
-
-
-def get_mathjax_manifest(proceed):
-    xhr = ajax('mathjax/manifest.json', mathjax_file_received.bind(None, 'manifest.json', proceed), ok_code=0)
-    xhr.responseType = 'json'
-    xhr.send()
-
-
-def get_mathjax_files_stage2(proceed):
-    if not get_mathjax_files_stage2.files_to_get.length:
-        proceed(get_mathjax_files_stage2.file_data)
-        return
-    for filename in get_mathjax_files_stage2.files_to_get:
-        xhr = ajax(f'mathjax/{filename}', mathjax_file_received.bind(None, filename, proceed), ok_code=0)
-        xhr.responseType = 'blob'
-        xhr.send()
-
-
-
 def get_mathjax_files(proceed):
-    if not get_mathjax_files.manifest:
-        get_mathjax_manifest(proceed)
-    else:
-        get_mathjax_files_stage2(proceed)
+    proceed({})
 
 
 def update_url_state(replace):