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"""Code for converting notebooks to and from v3."""
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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 json
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import re
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from .nbbase import (
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nbformat, nbformat_minor,
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NotebookNode,
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)
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from IPython.nbformat import v3
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from IPython.utils.log import get_logger
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def _warn_if_invalid(nb, version):
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"""Log validation errors, if there are any."""
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from IPython.nbformat import validate, ValidationError
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try:
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validate(nb, version=version)
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except ValidationError as e:
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get_logger().error("Notebook JSON is not valid v%i: %s", version, e)
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def upgrade(nb, from_version=3, from_minor=0):
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"""Convert a notebook to v4.
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Parameters
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----------
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nb : NotebookNode
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The Python representation of the notebook to convert.
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from_version : int
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The original version of the notebook to convert.
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from_minor : int
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The original minor version of the notebook to convert (only relevant for v >= 3).
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"""
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if from_version == 3:
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# Validate the notebook before conversion
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_warn_if_invalid(nb, from_version)
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# Mark the original nbformat so consumers know it has been converted
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orig_nbformat = nb.pop('orig_nbformat', None)
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nb.metadata.orig_nbformat = orig_nbformat or 3
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# Mark the new format
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nb.nbformat = nbformat
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nb.nbformat_minor = nbformat_minor
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# remove worksheet(s)
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nb['cells'] = cells = []
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# In the unlikely event of multiple worksheets,
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# they will be flattened
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for ws in nb.pop('worksheets', []):
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# upgrade each cell
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for cell in ws['cells']:
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cells.append(upgrade_cell(cell))
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# upgrade metadata
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nb.metadata.pop('name', '')
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# Validate the converted notebook before returning it
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_warn_if_invalid(nb, nbformat)
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return nb
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elif from_version == 4:
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# nothing to do
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if from_minor != nbformat_minor:
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nb.metadata.orig_nbformat_minor = from_minor
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nb.nbformat_minor = nbformat_minor
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return nb
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else:
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raise ValueError('Cannot convert a notebook directly from v%s to v4. ' \
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'Try using the IPython.nbformat.convert module.' % from_version)
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def upgrade_cell(cell):
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"""upgrade a cell from v3 to v4
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heading cell -> markdown heading
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code cell:
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- remove language metadata
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- cell.input -> cell.source
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- cell.prompt_number -> cell.execution_count
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- update outputs
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"""
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cell.setdefault('metadata', NotebookNode())
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if cell.cell_type == 'code':
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cell.pop('language', '')
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if 'collapsed' in cell:
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cell.metadata['collapsed'] = cell.pop('collapsed')
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cell.source = cell.pop('input', '')
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cell.execution_count = cell.pop('prompt_number', None)
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cell.outputs = upgrade_outputs(cell.outputs)
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elif cell.cell_type == 'heading':
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cell.cell_type = 'markdown'
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level = cell.pop('level', 1)
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cell.source = '{hashes} {single_line}'.format(
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hashes='#' * level,
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single_line = ' '.join(cell.get('source', '').splitlines()),
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)
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elif cell.cell_type == 'html':
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# Technically, this exists. It will never happen in practice.
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cell.cell_type = 'markdown'
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return cell
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def downgrade_cell(cell):
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"""downgrade a cell from v4 to v3
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code cell:
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- set cell.language
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- cell.input <- cell.source
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- cell.prompt_number <- cell.execution_count
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- update outputs
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markdown cell:
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- single-line heading -> heading cell
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"""
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if cell.cell_type == 'code':
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cell.language = 'python'
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cell.input = cell.pop('source', '')
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cell.prompt_number = cell.pop('execution_count', None)
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cell.collapsed = cell.metadata.pop('collapsed', False)
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cell.outputs = downgrade_outputs(cell.outputs)
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elif cell.cell_type == 'markdown':
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source = cell.get('source', '')
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if '\n' not in source and source.startswith('#'):
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prefix, text = re.match(r'(#+)\s*(.*)', source).groups()
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cell.cell_type = 'heading'
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cell.source = text
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cell.level = len(prefix)
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return cell
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_mime_map = {
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"text" : "text/plain",
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"html" : "text/html",
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"svg" : "image/svg+xml",
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"png" : "image/png",
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"jpeg" : "image/jpeg",
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"latex" : "text/latex",
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"json" : "application/json",
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"javascript" : "application/javascript",
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};
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def to_mime_key(d):
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"""convert dict with v3 aliases to plain mime-type keys"""
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for alias, mime in _mime_map.items():
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if alias in d:
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d[mime] = d.pop(alias)
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return d
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def from_mime_key(d):
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"""convert dict with mime-type keys to v3 aliases"""
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for alias, mime in _mime_map.items():
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if mime in d:
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d[alias] = d.pop(mime)
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return d
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def upgrade_output(output):
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"""upgrade a single code cell output from v3 to v4
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- pyout -> execute_result
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- pyerr -> error
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- output.type -> output.data.mime/type
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- mime-type keys
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- stream.stream -> stream.name
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"""
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if output['output_type'] in {'pyout', 'display_data'}:
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output.setdefault('metadata', NotebookNode())
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if output['output_type'] == 'pyout':
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output['output_type'] = 'execute_result'
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output['execution_count'] = output.pop('prompt_number', None)
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# move output data into data sub-dict
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data = {}
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for key in list(output):
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if key in {'output_type', 'execution_count', 'metadata'}:
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continue
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data[key] = output.pop(key)
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to_mime_key(data)
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output['data'] = data
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to_mime_key(output.metadata)
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if 'application/json' in data:
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data['application/json'] = json.loads(data['application/json'])
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# promote ascii bytes (from v2) to unicode
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for key in ('image/png', 'image/jpeg'):
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if key in data and isinstance(data[key], bytes):
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data[key] = data[key].decode('ascii')
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elif output['output_type'] == 'pyerr':
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output['output_type'] = 'error'
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elif output['output_type'] == 'stream':
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output['name'] = output.pop('stream')
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return output
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def downgrade_output(output):
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"""downgrade a single code cell output to v3 from v4
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- pyout <- execute_result
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- pyerr <- error
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- output.data.mime/type -> output.type
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- un-mime-type keys
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- stream.stream <- stream.name
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"""
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if output['output_type'] in {'execute_result', 'display_data'}:
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if output['output_type'] == 'execute_result':
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output['output_type'] = 'pyout'
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output['prompt_number'] = output.pop('execution_count', None)
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# promote data dict to top-level output namespace
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data = output.pop('data', {})
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if 'application/json' in data:
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data['application/json'] = json.dumps(data['application/json'])
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from_mime_key(data)
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output.update(data)
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from_mime_key(output.get('metadata', {}))
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elif output['output_type'] == 'error':
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output['output_type'] = 'pyerr'
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elif output['output_type'] == 'stream':
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output['stream'] = output.pop('name')
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return output
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def upgrade_outputs(outputs):
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"""upgrade outputs of a code cell from v3 to v4"""
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return [upgrade_output(op) for op in outputs]
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def downgrade_outputs(outputs):
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"""downgrade outputs of a code cell to v3 from v4"""
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return [downgrade_output(op) for op in outputs]
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def downgrade(nb):
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"""Convert a v4 notebook to v3.
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Parameters
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----------
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nb : NotebookNode
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The Python representation of the notebook to convert.
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"""
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if nb.nbformat != nbformat:
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return nb
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# Validate the notebook before conversion
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_warn_if_invalid(nb, nbformat)
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nb.nbformat = v3.nbformat
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nb.nbformat_minor = v3.nbformat_minor
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cells = [ downgrade_cell(cell) for cell in nb.pop('cells') ]
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nb.worksheets = [v3.new_worksheet(cells=cells)]
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nb.metadata.setdefault('name', '')
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nb.metadata.pop('orig_nbformat', None)
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nb.metadata.pop('orig_nbformat_minor', None)
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# Validate the converted notebook before returning it
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_warn_if_invalid(nb, v3.nbformat)
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return nb
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