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csv_dthreejs.py
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Thu, May 8, 14:40

csv_dthreejs.py
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## This file is part of Invenio.
## Copyright (C) 2013, 2014, 2014 CERN.
##
## Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""Render Bar chart from csv file."""
import csv
from chardet.universaldetector import UniversalDetector
from flask import current_app, render_template, request
from invenio.ext.cache import cache
@cache.memoize(timeout=172800)
def validate_csv(f):
"""Return dialect information about given csv file."""
with open(f.fullpath, 'rU') as csvfile:
is_valid = False
try:
dialect = csv.Sniffer().sniff(csvfile.read(1024))
except Exception as e:
current_app.logger.debug(
'File %s is not valid CSV: %s' % (f.name+f.superformat, e))
return {
'delimiter': '',
'encoding': '',
'is_valid': is_valid
}
u = UniversalDetector()
dialect.strict = True
csvfile.seek(0)
reader = csv.reader(csvfile, dialect)
try:
for row in reader:
u.feed(dialect.delimiter.join(row))
is_valid = True
except csv.Error as e:
current_app.logger.debug(
'File %s is not valid CSV: %s' % (f.name+f.superformat, e))
finally:
u.close()
return {
'delimiter': dialect.delimiter,
'encoding': u.result['encoding'],
'is_valid': is_valid
}
def can_preview(f):
"""Determine if the given file can be previewed."""
if f.superformat == '.csv':
return validate_csv(f)['is_valid']
else:
return False
def preview(f):
"""Render appropiate template with embed flag."""
file_info = validate_csv(f)
return render_template("previewer/csv_bar.html", f=f,
delimiter=file_info['delimiter'],
encoding=file_info['encoding'],
embed=request.args.get('embed', type=bool))

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