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""" Tablib - XLSX Support.
"""
from io import BytesIO
import tablib
from openpyxl.reader.excel import ExcelReader, load_workbook
from openpyxl.styles import Alignment, Font
from openpyxl.utils import get_column_letter
from openpyxl.workbook import Workbook
from openpyxl.writer.excel import ExcelWriter
class XLSXFormat:
title = 'xlsx'
extensions = ('xlsx',)
@classmethod
def detect(cls, stream):
"""Returns True if given stream is a readable excel file."""
try:
# No need to fully load the file, it should be enough to be able to
# read the manifest.
reader = ExcelReader(stream, read_only=False)
reader.read_manifest()
return True
except Exception:
return False
@classmethod
def export_set(cls, dataset, freeze_panes=True):
"""Returns XLSX representation of Dataset."""
wb = Workbook()
ws = wb.worksheets[0]
ws.title = dataset.title if dataset.title else 'Tablib Dataset'
cls.dset_sheet(dataset, ws, freeze_panes=freeze_panes)
stream = BytesIO()
wb.save(stream)
return stream.getvalue()
@classmethod
def export_book(cls, databook, freeze_panes=True):
"""Returns XLSX representation of DataBook."""
wb = Workbook()
for sheet in wb.worksheets:
wb.remove(sheet)
for i, dset in enumerate(databook._datasets):
ws = wb.create_sheet()
ws.title = dset.title if dset.title else 'Sheet%s' % (i)
cls.dset_sheet(dset, ws, freeze_panes=freeze_panes)
stream = BytesIO()
wb.save(stream)
return stream.getvalue()
@classmethod
def import_set(cls, dset, in_stream, headers=True):
"""Returns databook from XLS stream."""
dset.wipe()
xls_book = load_workbook(in_stream, read_only=True, data_only=True)
sheet = xls_book.active
dset.title = sheet.title
for i, row in enumerate(sheet.rows):
row_vals = [c.value for c in row]
if (i == 0) and (headers):
dset.headers = row_vals
else:
dset.append(row_vals)
@classmethod
def import_book(cls, dbook, in_stream, headers=True):
"""Returns databook from XLS stream."""
dbook.wipe()
xls_book = load_workbook(in_stream, read_only=True, data_only=True)
for sheet in xls_book.worksheets:
data = tablib.Dataset()
data.title = sheet.title
for i, row in enumerate(sheet.rows):
row_vals = [c.value for c in row]
if (i == 0) and (headers):
data.headers = row_vals
else:
data.append(row_vals)
dbook.add_sheet(data)
@classmethod
def dset_sheet(cls, dataset, ws, freeze_panes=True):
"""Completes given worksheet from given Dataset."""
_package = dataset._package(dicts=False)
for i, sep in enumerate(dataset._separators):
_offset = i
_package.insert((sep[0] + _offset), (sep[1],))
bold = Font(bold=True)
wrap_text = Alignment(wrap_text=True)
for i, row in enumerate(_package):
row_number = i + 1
for j, col in enumerate(row):
col_idx = get_column_letter(j + 1)
cell = ws['{}{}'.format(col_idx, row_number)]
# bold headers
if (row_number == 1) and dataset.headers:
cell.font = bold
if freeze_panes:
# Export Freeze only after first Line
ws.freeze_panes = 'A2'
# bold separators
elif len(row) < dataset.width:
cell.font = bold
# wrap the rest
else:
try:
str_col_value = str(col)
except TypeError:
str_col_value = ''
if '\n' in str_col_value:
cell.alignment = wrap_text
try:
cell.value = col
except (ValueError, TypeError):
cell.value = str(col)
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