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"""Read and write notebooks as regular .py files.
Authors:
* Brian Granger
"""
#-----------------------------------------------------------------------------
# Copyright (C) 2008-2011 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
import re
from .rwbase import NotebookReader, NotebookWriter
from .nbbase import new_code_cell, new_text_cell, new_worksheet, new_notebook
#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
_encoding_declaration_re = re.compile(r"^#.*coding[:=]\s*([-\w.]+)")
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 = []
state = u'codecell'
for line in lines:
if line.startswith(u'# <nbformat>') or _encoding_declaration_re.match(line):
pass
elif line.startswith(u'# <codecell>'):
cell = self.new_cell(state, cell_lines)
if cell is not None:
cells.append(cell)
state = u'codecell'
cell_lines = []
elif line.startswith(u'# <htmlcell>'):
cell = self.new_cell(state, cell_lines)
if cell is not None:
cells.append(cell)
state = u'htmlcell'
cell_lines = []
elif line.startswith(u'# <markdowncell>'):
cell = self.new_cell(state, cell_lines)
if cell is not None:
cells.append(cell)
state = u'markdowncell'
cell_lines = []
else:
cell_lines.append(line)
if cell_lines and state == u'codecell':
cell = self.new_cell(state, cell_lines)
if cell is not None:
cells.append(cell)
ws = new_worksheet(cells=cells)
nb = new_notebook(worksheets=[ws])
return nb
def new_cell(self, state, lines):
if state == u'codecell':
input = u'\n'.join(lines)
input = input.strip(u'\n')
if input:
return new_code_cell(input=input)
elif state == u'htmlcell':
text = self._remove_comments(lines)
if text:
return new_text_cell(u'html',source=text)
elif state == u'markdowncell':
text = self._remove_comments(lines)
if text:
return new_text_cell(u'markdown',source=text)
def _remove_comments(self, lines):
new_lines = []
for line in lines:
if line.startswith(u'#'):
new_lines.append(line[2:])
else:
new_lines.append(line)
text = u'\n'.join(new_lines)
text = text.strip(u'\n')
return text
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 = [u'# -*- coding: utf-8 -*-']
lines.extend([u'# <nbformat>2</nbformat>',''])
for ws in nb.worksheets:
for cell in ws.cells:
if cell.cell_type == u'code':
input = cell.get(u'input')
if input is not None:
lines.extend([u'# <codecell>',u''])
lines.extend(input.splitlines())
lines.append(u'')
elif cell.cell_type == u'html':
input = cell.get(u'source')
if input is not None:
lines.extend([u'# <htmlcell>',u''])
lines.extend([u'# ' + line for line in input.splitlines()])
lines.append(u'')
elif cell.cell_type == u'markdown':
input = cell.get(u'source')
if input is not None:
lines.extend([u'# <markdowncell>',u''])
lines.extend([u'# ' + line for line in input.splitlines()])
lines.append(u'')
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
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