|
|
"""Read and write notebooks as regular .py files."""
|
|
|
|
|
|
from .rwbase import NotebookReader, NotebookWriter
|
|
|
from .nbbase import new_code_cell, new_worksheet, new_notebook
|
|
|
|
|
|
|
|
|
class PyReaderError(Exception):
|
|
|
pass
|
|
|
|
|
|
|
|
|
class PyReader(NotebookReader):
|
|
|
|
|
|
def reads(self, s, **kwargs):
|
|
|
return self.to_notebook(s,**kwargs)
|
|
|
|
|
|
def to_notebook(self, s, **kwargs):
|
|
|
lines = s.splitlines()
|
|
|
cells = []
|
|
|
cell_lines = []
|
|
|
code_cell = False
|
|
|
for line in lines:
|
|
|
if line.startswith(u'# <nbformat>'):
|
|
|
pass
|
|
|
elif line.startswith(u'# <codecell>'):
|
|
|
if code_cell:
|
|
|
raise PyReaderError('Unexpected <codecell>')
|
|
|
# We can't use the ast to split blocks because there can be
|
|
|
# IPython syntax in the files.
|
|
|
# if cell_lines:
|
|
|
# for block in self.split_lines_into_blocks(cell_lines):
|
|
|
# cells.append(new_code_cell(input=block))
|
|
|
cell_lines = []
|
|
|
code_cell = True
|
|
|
elif line.startswith(u'# </codecell>'):
|
|
|
if not code_cell:
|
|
|
raise PyReaderError('Unexpected </codecell>')
|
|
|
code = u'\n'.join(cell_lines)
|
|
|
code = code.strip(u'\n')
|
|
|
if code:
|
|
|
cells.append(new_code_cell(input=code))
|
|
|
code_cell = False
|
|
|
else:
|
|
|
cell_lines.append(line)
|
|
|
# We can't use the ast to split blocks because there can be
|
|
|
# IPython syntax in the files.
|
|
|
# if cell_lines:
|
|
|
# for block in self.split_lines_into_blocks(cell_lines):
|
|
|
# cells.append(new_code_cell(input=block))
|
|
|
ws = new_worksheet(cells=cells)
|
|
|
nb = new_notebook(worksheets=[ws])
|
|
|
return nb
|
|
|
|
|
|
def split_lines_into_blocks(self, lines):
|
|
|
if len(lines) == 1:
|
|
|
yield lines[0]
|
|
|
raise StopIteration()
|
|
|
import ast
|
|
|
source = '\n'.join(lines)
|
|
|
code = ast.parse(source)
|
|
|
starts = [x.lineno-1 for x in code.body]
|
|
|
for i in range(len(starts)-1):
|
|
|
yield '\n'.join(lines[starts[i]:starts[i+1]]).strip('\n')
|
|
|
yield '\n'.join(lines[starts[-1]:]).strip('\n')
|
|
|
|
|
|
|
|
|
class PyWriter(NotebookWriter):
|
|
|
|
|
|
def writes(self, nb, **kwargs):
|
|
|
lines = []
|
|
|
lines.extend(['# <nbformat>2</nbformat>',''])
|
|
|
for ws in nb.worksheets:
|
|
|
for cell in ws.cells:
|
|
|
if cell.cell_type == 'code':
|
|
|
input = cell.get('input')
|
|
|
if input is not None:
|
|
|
lines.extend([u'# <codecell>',u''])
|
|
|
lines.extend(input.splitlines())
|
|
|
lines.extend([u'',u'# </codecell>'])
|
|
|
lines.append('')
|
|
|
return unicode('\n'.join(lines))
|
|
|
|
|
|
|
|
|
_reader = PyReader()
|
|
|
_writer = PyWriter()
|
|
|
|
|
|
reads = _reader.reads
|
|
|
read = _reader.read
|
|
|
to_notebook = _reader.to_notebook
|
|
|
write = _writer.write
|
|
|
writes = _writer.writes
|
|
|
|
|
|
|
