/usr/lib/python2.7/dist-packages/sagenb_export/sagenb_reader.py is in python-sagenb-export 3.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import re
try:
# Python 2
import cPickle as pickle
except ImportError:
# Python 3
import pickle
from sagenb_export.logger import log
from sagenb_export.unescape import unescape
CELL_FRONT = re.compile(u'^\{\{\{id=(?P<index>[0-9]*)\|$')
CELL_MID = re.compile(u'^///$')
CELL_BACK = re.compile(u'^\}\}\}$')
class Cell(object):
def __init__(self, input):
self.input = input
def __repr__(self):
return '{0}:"{1}"'.format(type(self), self.input.encode('utf-8', 'replace'))
class ComputeCell(Cell):
def __init__(self, index, input, output):
assert index >= 0
super(ComputeCell, self).__init__(input)
self.index = index
self.output = output
def ipython_input(self):
"""
Convert SageNB input to IPython input.
This converts % to %% cell magics and removes some cell magics
which have no meaning in IPython.
"""
# SageNB allows multiple % lines, but IPython doesn't. Still,
# in order to preserve as much as possible the meaning of the
# input, we convert all magics.
# Some magics like %hide which have no meaning in IPython are
# simply removed.
lines = iter(self.input.splitlines(True))
res = ""
for line in lines:
if not line.startswith('%'):
res += line
break
line = line.strip()
if line in ['%auto', '%hide', '%hideall', '%save_server']:
# Remove this directive
pass
else:
res += "%" + line + "\n"
for line in lines:
res += line
return res
def plain_text_output(self):
"""
Return the cell output without <html>...</html> blocks.
The Sage notebook has a peculiar feature where everything in
the output which is wrapped in <html>...</html> is rendered as
HTML. This is for example used for interacts.
These HTML blocks are most likely meaningless for IPython.
"""
# Code below based on the parse_html() function from
# sagenb/notebook/cell.py
s = self.output
t = ''
while len(s) > 0:
i = s.find('<html>')
if i == -1:
t += s
break
j = s.find('</html>')
if j == -1:
t += s[:i]
break
t += s[:i]
s = s[j + 7:]
t = t.replace('</html>', '')
return t
class TextCell(Cell):
pass
class WorksheetParser(object):
def __init__(self, worksheet_html):
self.worksheet_lines = worksheet_html.splitlines()
self.pos = 0
self.index = -1
log.debug('Worksheet has %s lines', len(self.worksheet_lines))
@property
def line(self):
return self.worksheet_lines[self.pos]
def get_line_and_forward(self):
line = self.line
self.pos += 1
return line
@property
def is_finished(self):
return self.pos >= len(self.worksheet_lines)
@property
def is_cell_front(self):
match = CELL_FRONT.match(self.line)
if match:
self.index = int(match.group('index'))
return True
else:
return False
@property
def is_cell_mid(self):
match = CELL_MID.match(self.line)
return match != None
@property
def is_cell_back(self):
match = CELL_BACK.match(self.line)
return match != None
def _try_read_text(self):
accumulator = []
while not (self.is_cell_front or self.is_finished):
log.debug('Read text: %s', self.line)
accumulator.append(self.get_line_and_forward())
accumulator = u'\n'.join(accumulator).strip()
if accumulator:
return TextCell(unescape(accumulator))
def _read_cell_input(self):
assert self.is_cell_front
self.pos += 1
accumulator = []
while not (self.is_cell_mid or self.is_finished):
log.debug('Read cell input: %s', self.line)
accumulator.append(self.get_line_and_forward())
return unescape(u'\n'.join(accumulator).strip())
def _read_cell_output(self):
assert self.is_cell_mid
self.pos += 1
accumulator = []
while not (self.is_cell_back or self.is_finished):
log.debug('Read cell output: %s', self.line)
accumulator.append(self.get_line_and_forward())
return unescape(u'\n'.join(accumulator).strip())
def _read_cell(self):
input = self._read_cell_input()
output = self._read_cell_output()
return ComputeCell(self.index, input, output)
def __iter__(self):
while not self.is_finished:
text = self._try_read_text()
if text:
yield text
yield self._read_cell()
if not self.is_finished:
assert self.is_cell_back
self.pos += 1
class NotebookSageNB(object):
def __init__(self, path):
log.debug('opening notebook root directory: %s', path)
self.path = path
with open(os.path.join(path, 'worksheet.html'), 'rb') as f:
self.ws = f.read().decode('utf-8')
with open(os.path.join(path, 'worksheet_conf.pickle'), 'rb') as f:
self.conf = pickle.load(f)
def __repr__(self):
return '{0}:"{1}"'.format(self.unique_id, self.name.encode('utf-8', 'replace'))
@classmethod
def all_iter(cls, dot_sage):
store = os.path.join(dot_sage, 'sage_notebook.sagenb', 'home', '__store__')
for path, dirs, files in os.walk(store):
worksheet = os.path.join(path, 'worksheet.html')
if os.path.isfile(worksheet):
yield cls(path)
@classmethod
def find(cls, dot_sage, name_or_unique_id):
for notebook in cls.all_iter(dot_sage):
if notebook.unique_id == name_or_unique_id:
return notebook
if notebook.name == name_or_unique_id:
return notebook
raise ValueError('no such notebook: {0}'.format(name_or_unique_id))
@property
def sort_key(self):
return (self.conf['owner'], self.conf['id_number'])
def __lt__(lhs, rhs):
return lhs.sort_key < rhs.sort_key
@property
def unique_id(self):
return '{0}:{1}'.format(self.conf['owner'], self.conf['id_number'])
@property
def name(self):
return self.conf['name']
@property
def cells(self):
for cell in WorksheetParser(self.ws):
log.debug('Cell: %s', cell)
yield cell
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