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"""Read and write notebooks as regular .py files.
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Authors:
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* Brian Granger
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2011 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 re
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from IPython.utils.py3compat import unicode_type
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from .rwbase import NotebookReader, NotebookWriter
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from .nbbase import new_code_cell, new_text_cell, new_worksheet, new_notebook
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#-----------------------------------------------------------------------------
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# Code
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#-----------------------------------------------------------------------------
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_encoding_declaration_re = re.compile(r"^#.*coding[:=]\s*([-\w.]+)")
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class PyReaderError(Exception):
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pass
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class PyReader(NotebookReader):
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def reads(self, s, **kwargs):
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return self.to_notebook(s,**kwargs)
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def to_notebook(self, s, **kwargs):
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lines = s.splitlines()
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cells = []
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cell_lines = []
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state = u'codecell'
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for line in lines:
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if line.startswith(u'# <nbformat>') or _encoding_declaration_re.match(line):
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pass
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elif line.startswith(u'# <codecell>'):
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cell = self.new_cell(state, cell_lines)
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if cell is not None:
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cells.append(cell)
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state = u'codecell'
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cell_lines = []
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elif line.startswith(u'# <htmlcell>'):
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cell = self.new_cell(state, cell_lines)
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if cell is not None:
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cells.append(cell)
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state = u'htmlcell'
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cell_lines = []
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elif line.startswith(u'# <markdowncell>'):
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cell = self.new_cell(state, cell_lines)
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if cell is not None:
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cells.append(cell)
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state = u'markdowncell'
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cell_lines = []
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else:
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cell_lines.append(line)
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if cell_lines and state == u'codecell':
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cell = self.new_cell(state, cell_lines)
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if cell is not None:
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cells.append(cell)
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ws = new_worksheet(cells=cells)
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nb = new_notebook(worksheets=[ws])
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return nb
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def new_cell(self, state, lines):
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if state == u'codecell':
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input = u'\n'.join(lines)
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input = input.strip(u'\n')
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if input:
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return new_code_cell(input=input)
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elif state == u'htmlcell':
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text = self._remove_comments(lines)
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if text:
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return new_text_cell(u'html',source=text)
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elif state == u'markdowncell':
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text = self._remove_comments(lines)
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if text:
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return new_text_cell(u'markdown',source=text)
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def _remove_comments(self, lines):
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new_lines = []
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for line in lines:
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if line.startswith(u'#'):
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new_lines.append(line[2:])
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else:
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new_lines.append(line)
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text = u'\n'.join(new_lines)
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text = text.strip(u'\n')
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return text
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def split_lines_into_blocks(self, lines):
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if len(lines) == 1:
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yield lines[0]
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raise StopIteration()
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import ast
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source = '\n'.join(lines)
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code = ast.parse(source)
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starts = [x.lineno-1 for x in code.body]
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for i in range(len(starts)-1):
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yield '\n'.join(lines[starts[i]:starts[i+1]]).strip('\n')
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yield '\n'.join(lines[starts[-1]:]).strip('\n')
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class PyWriter(NotebookWriter):
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def writes(self, nb, **kwargs):
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lines = [u'# -*- coding: utf-8 -*-']
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lines.extend([u'# <nbformat>2</nbformat>',''])
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for ws in nb.worksheets:
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for cell in ws.cells:
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if cell.cell_type == u'code':
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input = cell.get(u'input')
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if input is not None:
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lines.extend([u'# <codecell>',u''])
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lines.extend(input.splitlines())
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lines.append(u'')
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elif cell.cell_type == u'html':
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input = cell.get(u'source')
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if input is not None:
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lines.extend([u'# <htmlcell>',u''])
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lines.extend([u'# ' + line for line in input.splitlines()])
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lines.append(u'')
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elif cell.cell_type == u'markdown':
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input = cell.get(u'source')
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if input is not None:
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lines.extend([u'# <markdowncell>',u''])
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lines.extend([u'# ' + line for line in input.splitlines()])
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lines.append(u'')
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lines.append('')
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return unicode_type('\n'.join(lines))
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_reader = PyReader()
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_writer = PyWriter()
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reads = _reader.reads
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read = _reader.read
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to_notebook = _reader.to_notebook
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write = _writer.write
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writes = _writer.writes
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