/usr/lib/python3/dist-packages/openpyxl/writer/write_only.py is in python3-openpyxl 2.3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (c) 2010-2015 openpyxl
"""Write worksheets to xml representations in an optimized way"""
import atexit
from inspect import isgenerator
import os
from tempfile import NamedTemporaryFile
from openpyxl.cell import Cell
from openpyxl.worksheet import Worksheet
from openpyxl.worksheet.related import Related
from openpyxl.utils.exceptions import WorkbookAlreadySaved
from openpyxl.writer.excel import ExcelWriter
from openpyxl.writer.comments import CommentWriter
from .relations import write_rels
from .worksheet import (
write_autofilter,
write_datavalidation,
write_cell,
write_cols,
write_drawing,
write_format,
)
from openpyxl.xml.constants import SHEET_MAIN_NS
from openpyxl.xml.functions import xmlfile, Element
ALL_TEMP_FILES = []
@atexit.register
def _openpyxl_shutdown():
global ALL_TEMP_FILES
for path in ALL_TEMP_FILES:
if os.path.exists(path):
os.remove(path)
class CommentParentCell(object):
__slots__ = ('coordinate', 'row', 'column')
def __init__(self, cell):
self.coordinate = cell.coordinate
self.row = cell.row
self.column = cell.column
def create_temporary_file(suffix=''):
fobj = NamedTemporaryFile(mode='w+', suffix=suffix,
prefix='openpyxl.', delete=False)
filename = fobj.name
ALL_TEMP_FILES.append(filename)
return filename
def WriteOnlyCell(ws=None, value=None):
return Cell(worksheet=ws, column='A', row=1, value=value)
class WriteOnlyWorksheet(Worksheet):
"""
Streaming worksheet using lxml
Optimised to reduce memory by writing rows just in time
Cells can be styled and have comments
Styles for rows and columns must be applied before writing cells
"""
__saved = False
writer = None
def __init__(self, parent_workbook, title):
Worksheet.__init__(self, parent_workbook, title)
self._max_col = 0
self._max_row = 0
self._parent = parent_workbook
self._fileobj_name = create_temporary_file()
self._comments = []
@property
def filename(self):
return self._fileobj_name
def _write_header(self):
"""
Generator that creates the XML file and the sheet header
"""
with xmlfile(self.filename) as xf:
with xf.element("worksheet", xmlns=SHEET_MAIN_NS):
if self.sheet_properties:
pr = self.sheet_properties.to_tree()
xf.write(pr)
views = Element('sheetViews')
views.append(self.sheet_view.to_tree())
xf.write(views)
xf.write(write_format(self))
cols = write_cols(self)
if cols is not None:
xf.write(cols)
with xf.element("sheetData"):
try:
while True:
r = (yield)
xf.write(r)
except GeneratorExit:
pass
if self.protection.sheet:
xf.write(worksheet.protection.to_tree())
af = write_autofilter(self)
if af is not None:
xf.write(af)
dv = write_datavalidation(self)
if dv is not None:
xf.write(dv)
drawing = write_drawing(self)
if drawing is not None:
xf.write(drawing)
if self._comments:
legacyDrawing = Related(id="commentsvml")
xml = legacyDrawing.to_tree("legacyDrawing")
xf.write(xml)
def close(self):
if self.__saved:
self._already_saved()
if self.writer is None:
self.writer = self._write_header()
next(self.writer)
self.writer.close()
self.__saved = True
def _cleanup(self):
os.remove(self.filename)
def append(self, row):
"""
:param row: iterable containing values to append
:type row: iterable
"""
if (not isgenerator(row) and
not isinstance(row, (list, tuple, range))
):
self._invalid_row(row)
cell = WriteOnlyCell(self) # singleton
self._max_row += 1
row_idx = self._max_row
if self.writer is None:
self.writer = self._write_header()
next(self.writer)
el = Element("row", r='%d' % self._max_row)
col_idx = None
for col_idx, value in enumerate(row, 1):
if value is None:
continue
try:
cell.value = value
except ValueError:
if isinstance(value, Cell):
cell = value
if cell.comment is not None:
comment = cell.comment
comment._parent = CommentParentCell(cell)
self._comments.append(comment)
else:
raise ValueError
cell.col_idx = col_idx
cell.row = row_idx
styled = cell.has_style
tree = write_cell(self, cell, styled)
el.append(tree)
if styled: # styled cell or datetime
cell = WriteOnlyCell(self)
if col_idx:
self._max_col = max(self._max_col, col_idx)
el.set('spans', '1:%d' % col_idx)
try:
self.writer.send(el)
except StopIteration:
self._already_saved()
def _already_saved(self):
raise WorkbookAlreadySaved('Workbook has already been saved and cannot be modified or saved anymore.')
def _invalid_row(self, iterable):
raise TypeError('Value must be a list, tuple, range or a generator Supplied value is {0}'.format(
type(iterable))
)
def _write(self, shared_strings=None):
self.close()
with open(self.filename) as src:
out = src.read()
self._cleanup()
return out
def removed_method(*args, **kw):
raise NotImplementedError
setattr(WriteOnlyWorksheet, '__getitem__', removed_method)
setattr(WriteOnlyWorksheet, '__setitem__', removed_method)
setattr(WriteOnlyWorksheet, 'cell', removed_method)
setattr(WriteOnlyWorksheet, 'range', removed_method)
setattr(WriteOnlyWorksheet, 'merge_cells', removed_method)
class DumpCommentWriter(CommentWriter):
def extract_comments(self):
for comment in self.sheet._comments:
if comment is not None:
self.authors.add(comment.author)
self.comments.append(comment)
def save_dump(workbook, filename):
if workbook.worksheets == []:
workbook.create_sheet()
writer = ExcelWriter(workbook)
writer.comment_writer = DumpCommentWriter
writer.save(filename)
return True
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