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E-book viewer: When displaying an EPUB 3 document that uses epub:switch to provide a fallback for MathML content, prevent both the MathML and fallback from being shown together.

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PDF Output: When displaying an EPUB 3 document that uses epub:switch to provide a fallback for MathML content, prevent both the MathML and fallback from being rendered together.
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Kovid Goyal 2016-04-04 22:52:41 +05:30
parent 1f0143fe62
commit 3d22d93966
2 changed files with 24 additions and 0 deletions
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src/calibre/ebooks/oeb/display/mathjax.coffee
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@ -74,9 +74,33 @@ class MathJax
if script != null or document.getElementsByTagName('math').length > 0
this.math_present = true
this.remove_math_fallbacks()
this.load_mathjax(user_config, is_windows)
return this.math_present
remove_math_fallbacks: () ->
# localName no longer exists in Chrome >= 46 so you will need to
# investigate a proper solution for this in modern browsers. Probably
# use document.evaluate() and node.tagName? IE does not support
# document.evaluate() but Edge may or may not, you will need to
# experiment
for sw in document.getElementsByTagName("epub:switch")
non_math = []
found_math = false
c = sw.firstChild
while c
if c.localName == 'epub:case'
if c.getAttribute('required-namespace') == "http://www.w3.org/1998/Math/MathML"
found_math = c
else
non_math.push(c)
else if c.localName == 'epub:default'
non_math.push(c)
c = c.nextSibling
if found_math
for c in non_math
c.style.display = 'none'
after_resize: () ->
if not this.math_present or this.hub == null
return