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"""Module containing a transformer that converts outputs in the notebook from
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one format to another.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (c) 2013, the IPython Development Team.
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#
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# Distributed under the terms of the Modified BSD License.
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#
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# The full license is in the file COPYING.txt, distributed with this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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from .base import ConfigurableTransformer
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from IPython.utils.traitlets import Unicode
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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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class ConvertFiguresTransformer(ConfigurableTransformer):
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"""
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Converts all of the outputs in a notebook from one format to another.
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"""
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from_format = Unicode(config=True, help='Format the converter accepts')
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to_format = Unicode(config=True, help='Format the converter writes')
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def __init__(self, **kw):
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"""
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Public constructor
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"""
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super(ConvertFiguresTransformer, self).__init__(**kw)
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def convert_figure(self, data_format, data):
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raise NotImplementedError()
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def transform_cell(self, cell, resources, cell_index):
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"""
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Apply a transformation on each cell,
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See base.py
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"""
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#Loop through all of the datatypes of the outputs in the cell.
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for index, cell_out in enumerate(cell.get('outputs', [])):
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for data_type, data in cell_out.items():
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#Get the name of the file exported by the extract figure
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#transformer. Do not try to convert the figure if the extract
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#fig transformer hasn't touched it
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filename = cell_out.get(data_type + '_filename', None)
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if filename:
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figure_name = filename[:filename.rfind('.')]
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self._convert_figure(cell_out, figure_name, resources, data_type, data)
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return cell, resources
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def _convert_figure(self, cell_out, resources, figure_name, data_type, data):
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"""
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Convert a figure and output the results to the cell output
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"""
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if not self.to_format in cell_out:
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if data_type == self.from_format:
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filename = figure_name + '.' + self.to_format
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if filename not in resources['figures']:
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#On the cell, make the figure available via
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# cell.outputs[i].pdf_filename ... etc (PDF in example)
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cell_out[self.to_format + '_filename'] = filename
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#In the resources, make the figure available via
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# resources['figures']['filename'] = data
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resources['figures'][filename] = self.convert_figure(data_type, data)
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