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"""API for reading notebooks.
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Authors:
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* Jonathan Frederic
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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 BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import json
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from . import v1
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from . import v2
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from . import v3
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versions = {
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1: v1,
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2: v2,
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3: v3,
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}
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#-----------------------------------------------------------------------------
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# Code
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#-----------------------------------------------------------------------------
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class NotJSONError(ValueError):
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pass
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def parse_json(s, **kwargs):
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"""Parse a JSON string into a dict."""
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try:
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nb_dict = json.loads(s, **kwargs)
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except ValueError:
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# Limit the error message to 80 characters. Display whatever JSON will fit.
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raise NotJSONError(("Notebook does not appear to be JSON: %r" % s)[:77] + "...")
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return nb_dict
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# High level API
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def get_version(nb):
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"""Get the version of a notebook.
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Parameters
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----------
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nb : dict
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NotebookNode or dict containing notebook data.
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Returns
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-------
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Tuple containing major (int) and minor (int) version numbers
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"""
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major = nb.get('nbformat', 1)
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minor = nb.get('nbformat_minor', 0)
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return (major, minor)
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def reads(s, **kwargs):
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"""Read a notebook from a json string and return the
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NotebookNode object.
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This function properly reads notebooks of any version. No version
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conversion is performed.
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Parameters
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----------
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s : unicode
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The raw unicode string to read the notebook from.
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Returns
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-------
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nb : NotebookNode
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The notebook that was read.
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"""
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from .current import NBFormatError
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nb_dict = parse_json(s, **kwargs)
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(major, minor) = get_version(nb_dict)
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if major in versions:
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return versions[major].to_notebook_json(nb_dict, minor=minor)
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else:
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raise NBFormatError('Unsupported nbformat version %s' % major)
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def read(fp, **kwargs):
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"""Read a notebook from a file and return the NotebookNode object.
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This function properly reads notebooks of any version. No version
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conversion is performed.
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Parameters
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----------
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fp : file
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Any file-like object with a read method.
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Returns
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-------
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nb : NotebookNode
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The notebook that was read.
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"""
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return reads(fp.read(), **kwargs)
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