|
|
"""
|
|
|
Module that allows latex output notebooks to be conditioned before
|
|
|
they are converted.
|
|
|
"""
|
|
|
from __future__ import absolute_import
|
|
|
|
|
|
# Configurable traitlets
|
|
|
|
|
|
# Needed to override transformer
|
|
|
from .transformers import (ActivatableTransformer)
|
|
|
|
|
|
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
|
|
|
|
|
|
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
|
|
|
|
