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# -*- coding: utf-8 -*-
#
# Python 2's csv module does not support Unicode input and output.
# Use the UnicodeReader and UnicodeWriter class to provide
# unicode csv i/o in django.
#
# Ref:
# https://docs.djangoproject.com/en/dev/howto/outputting-csv/
# https://docs.python.org/2/library/csv.html
#
import csv, codecs, cStringIO
class UTF8Recoder:
"""
Iterator that reads an encoded stream and reencodes the input to UTF-8
"""
def __init__(self, f, encoding):
self.reader = codecs.getreader(encoding)(f)
def __iter__(self):
return self
def next(self):
return self.reader.next().encode('utf-8')
class UnicodeReader:
"""
A CSV reader which will iterate over lines in the CSV file "f",
which is encoded in the given encoding.
"""
def __init__(self, f, dialect='excel', encoding='utf-8', **kwargs):
f = UTF8Recoder(f, encoding)
self.reader = csv.reader(f, dialect=dialect, **kwargs)
def next(self):
row = self.reader.next()
return [unicode(s, 'utf-8') for s in row]
def __iter__(self):
return self
class UnicodeWriter:
"""
A CSV writer which will write rows to CSV file "f",
which is encoded in the given encoding.
"""
def __init__(self, f, dialect='excel', encoding='utf-8', **kwargs):
# Redirect output to a queue
self.queue = cStringIO.StringIO()
self.writer = csv.writer(self.queue, dialect=dialect, **kwargs)
self.stream = f
self.encoder = codecs.getincrementalencoder(encoding)()
def writerow(self, row):
self.writer.writerow([s.encode('utf-8') for s in row])
# Fetch UTF-8 output from the queue ...
data = self.queue.getvalue()
data = data.decode('utf-8')
# ... and reencode it into the target encoding
data = self.encoder.encode(data)
# write to the target stream
self.stream.write(data)
# empty queue
self.queue.truncate(0)
def writerows(self, rows):
for row in rows:
self.writerow(row)
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