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# -*- coding: utf-8 -*-
""" Tablib - XLS Support.
"""
import sys
from io import BytesIO
from tablib.compat import xrange
import tablib
import xlrd
import xlwt
from xlrd.biffh import XLRDError
title = 'xls'
extensions = ('xls',)
# special styles
wrap = xlwt.easyxf("alignment: wrap on")
bold = xlwt.easyxf("font: bold on")
def detect(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
def export_set(dataset):
"""Returns XLS representation of Dataset."""
wb = xlwt.Workbook(encoding='utf8')
ws = wb.add_sheet(dataset.title if dataset.title else 'Tablib Dataset')
dset_sheet(dataset, ws)
stream = BytesIO()
wb.save(stream)
return stream.getvalue()
def export_book(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))
dset_sheet(dset, ws)
stream = BytesIO()
wb.save(stream)
return stream.getvalue()
def import_set(dset, in_stream, headers=True):
"""Returns databook from XLS stream."""
dset.wipe()
xls_book = xlrd.open_workbook(file_contents=in_stream)
sheet = xls_book.sheet_by_index(0)
dset.title = sheet.name
for i in xrange(sheet.nrows):
if (i == 0) and (headers):
dset.headers = sheet.row_values(0)
else:
dset.append(sheet.row_values(i))
def import_book(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 xrange(sheet.nrows):
if (i == 0) and (headers):
data.headers = sheet.row_values(0)
else:
data.append(sheet.row_values(i))
dbook.add_sheet(data)
def dset_sheet(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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