##// END OF EJS Templates
Added spaces between comments.
Added spaces between comments.

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latex.py
97 lines | 3.3 KiB | text/x-python | PythonLexer
"""Latex transformer.
Module that allows latex output notebooks to be conditioned before
they are converted.
"""
#-----------------------------------------------------------------------------
# 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
#-----------------------------------------------------------------------------
from __future__ import print_function, absolute_import
# Our own imports
# Needed to override transformer
from .transformers import (ActivatableTransformer) #TODO
#-----------------------------------------------------------------------------
# Classes
#-----------------------------------------------------------------------------
class LatexTransformer(ActivatableTransformer):
"""
Converter for latex destined documents.
"""
def cell_transform(self, cell, other, index):
"""
Apply a transformation on each cell,
receive the current cell, the resource dict and the index of current cell as parameter.
Returns modified cell and resource dict.
"""
if hasattr(cell, "source") and cell.cell_type == "markdown":
cell.source = rm_math_space(cell.source)
return cell, other
#-----------------------------------------------------------------------------
# Functions
#-----------------------------------------------------------------------------
def rm_math_space(text):
"""
Remove the space between latex math commands and enclosing $ symbols.
"""
# 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