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Need to escape keywords such as 'in' from MathJax

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kimth
2012-09-09 13:12:51 -04:00
parent 2b17fb626b
commit 4881d54a49
1 changed files with 24 additions and 8 deletions
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32
common/lib/xmodule/xmodule/js/src/capa/display.coffee
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@@ -299,24 +299,40 @@ class @Problem
target = "display_#{element.id.replace(/^input_/, '')}"
if jax = MathJax.Hub.getAllJax(target)[0]
eqn = @latexify($(element).val())
eqn = @mathjax_preprocessor($(element).val())
#eqn = $(element).val()
MathJax.Hub.Queue ['Text', jax, eqn],
[@updateMathML, jax, element]
latexify: (eqn) ->
mathjax_preprocessor: (eqn) ->
###
Translate 6.002x conventions for subscripts to standard Latex, e.g.
'R3' --> 'R_{3}'
'vGS' --> 'v_{GS}'
'K/2*(vIN-VT)^2' --> 'K/2*(v_{IN}-V_{T})^2'
###
subscript_replace = (match) ->
# Default keywords are taken from capa/calc.py
default_keywords = ['sin', 'cos', 'tan', 'sqrt', 'log10', 'log2', 'ln', 'arccos', 'arcsin', 'arctan', 'abs', 'pi']
if match in default_keywords
# Default keywords are taken from capa/calc.py
default_keywords = ['sin', 'cos', 'tan', 'sqrt', 'log10', 'log2', 'ln', 'arccos', 'arcsin', 'arctan', 'abs', 'pi']
# Escape keywords are strings that have special meaning in 6.002x that should not be processed by Jax
escape_keywords = ['in']
# First, perform subscript insertion
replace_subscript = (match) ->
if match in default_keywords or match in escape_keywords
return match
return match[0] + '_{' + match.substr(1) + '}'
return eqn.replace(/[A-Za-z]\w+/g, subscript_replace)
else
return match[0] + '_{' + match.substr(1) + '}'
eqn = eqn.replace(/[A-Za-z]\w+/g, replace_subscript)
# Second, escape 6.002x-specific keywords from MathJax
replace_escape_keyword = (match) ->
return '"' + match + '"' # Force MathJax plain text
for escape_keyword in escape_keywords
eqn = eqn.replace(escape_keyword, replace_escape_keyword)
return eqn
updateMathML: (jax, element) =>
try