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# -*- coding: utf-8 -*-
""" Tablib - XLSX Support.
"""
import sys
from io import BytesIO
import openpyxl
import tablib
Workbook = openpyxl.workbook.Workbook
ExcelWriter = openpyxl.writer.excel.ExcelWriter
get_column_letter = openpyxl.utils.get_column_letter
from tablib.compat import unicode
title = 'xlsx'
extensions = ('xlsx',)
def detect(stream):
"""Returns True if given stream is a readable excel file."""
if isinstance(stream, bytes):
# load_workbook expects a file-like object.
stream = BytesIO(stream)
try:
openpyxl.reader.excel.load_workbook(stream, read_only=True)
return True
except Exception:
return False
def export_set(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'
dset_sheet(dataset, ws, freeze_panes=freeze_panes)
stream = BytesIO()
wb.save(stream)
return stream.getvalue()
def export_book(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)
dset_sheet(dset, ws, freeze_panes=freeze_panes)
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 = openpyxl.reader.excel.load_workbook(BytesIO(in_stream), read_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)
def import_book(dbook, in_stream, headers=True):
"""Returns databook from XLS stream."""
dbook.wipe()
xls_book = openpyxl.reader.excel.load_workbook(BytesIO(in_stream), read_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)
def dset_sheet(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 = openpyxl.styles.Font(bold=True)
wrap_text = openpyxl.styles.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['%s%s' % (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 = unicode(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 = unicode(col)
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