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"""
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Module that allows latex output notebooks to be conditioned before
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they are converted.
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"""
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from __future__ import absolute_import
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# Configurable traitlets
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# Needed to override transformer
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from .transformers import (ActivatableTransformer)
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class LatexTransformer(ActivatableTransformer):
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"""
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Converter for latex destined documents.
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"""
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def cell_transform(self, cell, other, index):
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"""
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Apply a transformation on each cell,
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receive the current cell, the resource dict and the index of current cell as parameter.
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Returns modified cell and resource dict.
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"""
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if hasattr(cell, "source") and cell.cell_type == "markdown":
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cell.source = remove_math_space(cell.source)
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return cell, other
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def remove_math_space(text):
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"""
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Remove the space between latex math commands and enclosing $ symbols.
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"""
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# First, scan through the markdown looking for $. If
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# a $ symbol is found, without a preceding \, assume
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# it is the start of a math block. UNLESS that $ is
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# not followed by another within two math_lines.
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math_regions = []
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math_lines = 0
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within_math = False
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math_start_index = 0
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ptext = ''
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last_character = ""
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skip = False
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for index, char in enumerate(text):
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#Make sure the character isn't preceeded by a backslash
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if (char == "$" and last_character != "\\"):
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# Close the math region if this is an ending $
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if within_math:
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within_math = False
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skip = True
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ptext = ptext+'$'+text[math_start_index+1:index].strip()+'$'
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math_regions.append([math_start_index, index+1])
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else:
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# Start a new math region
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within_math = True
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math_start_index = index
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math_lines = 0
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# If we are in a math region, count the number of lines parsed.
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# Cancel the math region if we find two line breaks!
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elif char == "\n":
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if within_math:
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math_lines += 1
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if math_lines > 1:
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within_math = False
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ptext = ptext+text[math_start_index:index]+"\n"
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print 'catching up with --',text[math_start_index:index],'--'
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# Remember the last character so we can easily watch
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# for backslashes
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last_character = char
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if not within_math and not skip:
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ptext = ptext+char
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if skip:
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skip = False
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return ptext
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