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latex.py
115 lines | 3.6 KiB | text/x-python | PythonLexer
"""Latex filters.
Module of useful filters for processing Latex within Jinja latex templates.
"""
#-----------------------------------------------------------------------------
# Copyright (c) 2013, the IPython Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file COPYING.txt, distributed with this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
import re
#-----------------------------------------------------------------------------
# Globals and constants
#-----------------------------------------------------------------------------
#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'),
)
#-----------------------------------------------------------------------------
# Functions
#-----------------------------------------------------------------------------
__all__ = [
'escape_latex',
'rm_math_space'
]
def escape_latex(text):
"""
Escape characters that may conflict with latex.
Parameters
----------
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
def rm_math_space(text):
"""
Remove the space between latex math commands and enclosing $ symbols.
This filter is important because latex isn't as flexible as the notebook
front end when it comes to flagging math using ampersand symbols.
Parameters
----------
text : str
Text to filter.
"""
# First, scan through the markdown looking for $. If
# a $ symbol is found, without a preceding \, assume
# it is the start of a math block. UNLESS that $ is
# not followed by another within two math_lines.
math_regions = []
math_lines = 0
within_math = False
math_start_index = 0
ptext = ''
last_character = ""
skip = False
for index, char in enumerate(text):
#Make sure the character isn't preceeded by a backslash
if (char == "$" and last_character != "\\"):
# Close the math region if this is an ending $
if within_math:
within_math = False
skip = True
ptext = ptext+'$'+text[math_start_index+1:index].strip()+'$'
math_regions.append([math_start_index, index+1])
else:
# Start a new math region
within_math = True
math_start_index = index
math_lines = 0
# If we are in a math region, count the number of lines parsed.
# Cancel the math region if we find two line breaks!
elif char == "\n":
if within_math:
math_lines += 1
if math_lines > 1:
within_math = False
ptext = ptext+text[math_start_index:index]
# Remember the last character so we can easily watch
# for backslashes
last_character = char
if not within_math and not skip:
ptext = ptext+char
if skip:
skip = False
return ptext