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- """Read and write notebooks in JSON format."""
- # Copyright (c) IPython Development Team.
- # Distributed under the terms of the Modified BSD License.
- import copy
- import json
- from ipython_genutils import py3compat
- from ..notebooknode import from_dict
- from .rwbase import (
- NotebookReader, NotebookWriter, rejoin_lines, split_lines, strip_transient
- )
- class BytesEncoder(json.JSONEncoder):
- """A JSON encoder that accepts b64 (and other *ascii*) bytestrings."""
- def default(self, obj):
- if isinstance(obj, bytes):
- return obj.decode('ascii')
- return json.JSONEncoder.default(self, obj)
- class JSONReader(NotebookReader):
- def reads(self, s, **kwargs):
- """Read a JSON string into a Notebook object"""
- nb = json.loads(s, **kwargs)
- nb = self.to_notebook(nb, **kwargs)
- return nb
- def to_notebook(self, d, **kwargs):
- """Convert a disk-format notebook dict to in-memory NotebookNode
-
- handles multi-line values as strings, scrubbing of transient values, etc.
- """
- nb = from_dict(d)
- nb = rejoin_lines(nb)
- nb = strip_transient(nb)
- return nb
- class JSONWriter(NotebookWriter):
- def writes(self, nb, **kwargs):
- """Serialize a NotebookNode object as a JSON string"""
- kwargs['cls'] = BytesEncoder
- kwargs['indent'] = 1
- kwargs['sort_keys'] = True
- kwargs['separators'] = (',',': ')
- kwargs.setdefault('ensure_ascii', False)
- # don't modify in-memory dict
- nb = copy.deepcopy(nb)
- if kwargs.pop('split_lines', True):
- nb = split_lines(nb)
- nb = strip_transient(nb)
- return py3compat.cast_unicode_py2(json.dumps(nb, **kwargs), 'utf-8')
- _reader = JSONReader()
- _writer = JSONWriter()
- reads = _reader.reads
- read = _reader.read
- to_notebook = _reader.to_notebook
- write = _writer.write
- writes = _writer.writes
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