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70 lines
2.4 KiB
70 lines
2.4 KiB
"""
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Module containing a preprocessor that removes cells if they match
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one or more regular expression.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import re
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from traitlets import List, Unicode
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from .base import Preprocessor
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class RegexRemovePreprocessor(Preprocessor):
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"""
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Removes cells from a notebook that match one or more regular expression.
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For each cell, the preprocessor checks whether its contents match
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the regular expressions in the ``patterns`` traitlet which is a list
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of unicode strings. If the contents match any of the patterns, the cell
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is removed from the notebook.
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To modify the list of matched patterns,
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modify the patterns traitlet. For example, execute the following command
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to convert a notebook to html and remove cells containing only whitespace::
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jupyter nbconvert --RegexRemovePreprocessor.patterns="['\\s*\\Z']" mynotebook.ipynb
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The command line argument
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sets the list of patterns to ``'\\s*\\Z'`` which matches an arbitrary number
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of whitespace characters followed by the end of the string.
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See https://regex101.com/ for an interactive guide to regular expressions
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(make sure to select the python flavor). See
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https://docs.python.org/library/re.html for the official regular expression
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documentation in python.
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"""
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patterns = List(Unicode(), default_value=[]).tag(config=True)
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def check_conditions(self, cell):
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"""
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Checks that a cell matches the pattern.
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Returns: Boolean.
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True means cell should *not* be removed.
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"""
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# Compile all the patterns into one: each pattern is first wrapped
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# by a non-capturing group to ensure the correct order of precedence
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# and the patterns are joined with a logical or
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pattern = re.compile('|'.join('(?:%s)' % pattern
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for pattern in self.patterns))
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# Filter out cells that meet the pattern and have no outputs
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return not pattern.match(cell.source)
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def preprocess(self, nb, resources):
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"""
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Preprocessing to apply to each notebook. See base.py for details.
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"""
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# Skip preprocessing if the list of patterns is empty
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if not self.patterns:
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return nb, resources
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# Filter out cells that meet the conditions
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nb.cells = [cell for cell in nb.cells if self.check_conditions(cell)]
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return nb, resources
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