FIX, don't use regex

IPython/nbconvert/filters/latex.py

@@ -20,25 +20,26 import re
 #-----------------------------------------------------------------------------
 
 #Latex substitutions for escaping latex.
-LATEX_SUBS = (
-    (re.compile('\033\[[0-9;]+m'),''),  # handle console escapes
-    (re.compile(r'\\'), r'{\\textbackslash}'),
-    (re.compile(r'([{}_#%&$])'), r'\\\1'),
-    (re.compile(r'~'), r'\~{}'),
-    (re.compile(r'\^'), r'\^{}'),
-    (re.compile(r'"'), r"''"),
-    (re.compile(r'\.\.\.+'), r'\\ldots'),
-)
+# see: http://stackoverflow.com/questions/16259923/how-can-i-escape-latex-special-characters-inside-django-templates
+LATEX_SUBS = {
+    '&':  r'\&',
+    '%':  r'\%', 
+    '$':  r'\$', 
+    '#':  r'\#', 
+    '_':  r'\letterunderscore{}', 
+    '{':  r'\letteropenbrace{}', 
+    '}':  r'\letterclosebrace{}',
+    '~':  r'\lettertilde{}', 
+    '^':  r'\letterhat{}', 
+    '\\': r'\letterbackslash{}'}
+
 
 #-----------------------------------------------------------------------------
 # Functions
 #-----------------------------------------------------------------------------
 
-__all__ = [
-    'escape_latex',
-    'strip_math_space'
-]
-
+__all__ = ['escape_latex',
+           'strip_math_space']
 
 def escape_latex(text):
     """
@@ -49,10 +50,8 def escape_latex(text):
     text : str
         Text containing characters that may conflict with Latex
     """
-    return_text = text
-    for pattern, replacement in LATEX_SUBS:
-        return_text = pattern.sub(replacement, return_text)
-    return return_text
+
+    return ''.join([LATEX_SUBS.get(c, c) for c in text])
     
     
 def strip_math_space(text):

IPython/nbconvert/filters/tests/test_latex.py

@@ -28,9 +28,9 class TestLatex(TestsBase):
     def test_escape_latex(self):
         """escape_latex test"""
         tests = [
-            (r'How are \you doing today?', r'How are \textbackslashyou doing today?'),
-            (r'\escapechar=`\A\catcode`\|=0 |string|foo', r'\textbackslashescapechar=`\textbackslashA\textbackslashcatcode`\textbackslash|=0 |string|foo'),
-            (r'# $ % & ~ _ ^ \ { }',r'\# \$ \% \& \~{} \_ \^{} \textbackslash \{ \}'),
+            (r'How are \you doing today?', r'How are \letterbackslash{}you doing today?'),
+            (r'\escapechar=`\A\catcode`\|=0 |string|foo', r'\letterbackslash{}escapechar=`\letterbackslash{}A\letterbackslash{}catcode`\letterbackslash{}|=0 |string|foo'),
+            (r'# $ % & ~ _ ^ \ { }', r'\# \$ \% \& \lettertilde{} \letterunderscore{} \letterhat{} \letterbackslash{} \letteropenbrace{} \letterclosebrace{}'),
             ('','')]
 
         for test in tests: