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""" Tablib - XLS Support.
"""
from io import BytesIO
import xlrd
import xlwt
from xlrd.xldate import xldate_as_datetime
import tablib
# special styles
wrap = xlwt.easyxf("alignment: wrap on")
bold = xlwt.easyxf("font: bold on")
class XLSFormat:
title = 'xls'
extensions = ('xls',)
@classmethod
def detect(cls, stream):
"""Returns True if given stream is a readable excel file."""
try:
xlrd.open_workbook(file_contents=stream)
return True
except Exception:
pass
try:
xlrd.open_workbook(file_contents=stream.read())
return True
except Exception:
pass
try:
xlrd.open_workbook(filename=stream)
return True
except Exception:
return False
@classmethod
def export_set(cls, dataset):
"""Returns XLS representation of Dataset."""
wb = xlwt.Workbook(encoding='utf8')
ws = wb.add_sheet(dataset.title if dataset.title else 'Tablib Dataset')
cls.dset_sheet(dataset, ws)
stream = BytesIO()
wb.save(stream)
return stream.getvalue()
@classmethod
def export_book(cls, databook):
"""Returns XLS representation of DataBook."""
wb = xlwt.Workbook(encoding='utf8')
for i, dset in enumerate(databook._datasets):
ws = wb.add_sheet(dset.title if dset.title else 'Sheet%s' % (i))
cls.dset_sheet(dset, ws)
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 = xlrd.open_workbook(file_contents=in_stream.read())
sheet = xls_book.sheet_by_index(0)
dset.title = sheet.name
def cell_value(value, type_):
if type_ == xlrd.XL_CELL_ERROR:
return xlrd.error_text_from_code[value]
elif type_ == xlrd.XL_CELL_DATE:
return xldate_as_datetime(value, xls_book.datemode)
return value
for i in range(sheet.nrows):
if i == 0 and headers:
dset.headers = sheet.row_values(0)
else:
dset.append([
cell_value(val, typ)
for val, typ in zip(sheet.row_values(i), sheet.row_types(i))
])
@classmethod
def import_book(cls, dbook, in_stream, headers=True):
"""Returns databook from XLS stream."""
dbook.wipe()
xls_book = xlrd.open_workbook(file_contents=in_stream)
for sheet in xls_book.sheets():
data = tablib.Dataset()
data.title = sheet.name
for i in range(sheet.nrows):
if i == 0 and headers:
data.headers = sheet.row_values(0)
else:
data.append(sheet.row_values(i))
dbook.add_sheet(data)
@classmethod
def dset_sheet(cls, dataset, ws):
"""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],))
for i, row in enumerate(_package):
for j, col in enumerate(row):
# bold headers
if (i == 0) and dataset.headers:
ws.write(i, j, col, bold)
# frozen header row
ws.panes_frozen = True
ws.horz_split_pos = 1
# bold separators
elif len(row) < dataset.width:
ws.write(i, j, col, bold)
# wrap the rest
else:
try:
if '\n' in col:
ws.write(i, j, col, wrap)
else:
ws.write(i, j, col)
except TypeError:
ws.write(i, j, col)
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