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# -*- coding: utf-8 -*-
""" Tablib - *SV Support.
"""
from tablib.compat import csv, StringIO, unicode
title = 'csv'
extensions = ('csv',)
DEFAULT_DELIMITER = unicode(',')
def export_stream_set(dataset, **kwargs):
"""Returns CSV representation of Dataset as file-like."""
stream = StringIO()
kwargs.setdefault('delimiter', DEFAULT_DELIMITER)
_csv = csv.writer(stream, **kwargs)
for row in dataset._package(dicts=False):
_csv.writerow(row)
stream.seek(0)
return stream
def export_set(dataset, **kwargs):
"""Returns CSV representation of Dataset."""
stream = export_stream_set(dataset, **kwargs)
return stream.getvalue()
def import_set(dset, in_stream, headers=True, **kwargs):
"""Returns dataset from CSV stream."""
dset.wipe()
kwargs.setdefault('delimiter', DEFAULT_DELIMITER)
rows = csv.reader(StringIO(in_stream), **kwargs)
for i, row in enumerate(rows):
if (i == 0) and (headers):
dset.headers = row
elif row:
dset.append(row)
def detect(stream, delimiter=DEFAULT_DELIMITER):
"""Returns True if given stream is valid CSV."""
try:
csv.Sniffer().sniff(stream, delimiters=delimiter)
return True
except Exception:
return False
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