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class ExtractFigureTransformer(ActivatableTransformer):
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extra_ext_map = Dict({},
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config=True,
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help="""extra map to override extension based on type.
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Usefull for latex where svg will be converted to pdf before inclusion
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"""
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)
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key_format_map = Dict({},
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config=True,
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)
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figname_format_map = Dict({},
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config=True,
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)
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#to do change this to .format {} syntax
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default_key_tpl = Unicode('_fig_{count:02d}.{ext}', config=True)
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def _get_ext(self, ext):
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if ext in self.extra_ext_map :
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return self.extra_ext_map[ext]
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return ext
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def _new_figure(self, data, fmt, count):
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"""Create a new figure file in the given format.
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"""
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tplf = self.figname_format_map.get(fmt, self.default_key_tpl)
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tplk = self.key_format_map.get(fmt, self.default_key_tpl)
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# option to pass the hash as data ?
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figname = tplf.format(count=count, ext=self._get_ext(fmt))
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key = tplk.format(count=count, ext=self._get_ext(fmt))
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# Binary files are base64-encoded, SVG is already XML
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binary = False
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if fmt in ('png', 'jpg', 'pdf'):
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data = data.decode('base64')
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binary = True
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return figname, key, data, binary
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def cell_transform(self, cell, other, count):
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if other.get('figures', None) is None :
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other['figures'] = {'text':{},'binary':{}}
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for out in cell.get('outputs', []):
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for out_type in self.display_data_priority:
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if out.hasattr(out_type):
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figname, key, data, binary = self._new_figure(out[out_type], out_type, count)
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out['key_'+out_type] = figname
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if binary :
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other['figures']['binary'][key] = data
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else :
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other['figures']['text'][key] = data
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count = count+1
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return cell, other
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