openmedialibrary/oml/utils.py

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2014-05-04 17:26:43 +00:00
# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
import Image
from StringIO import StringIO
import re
import stdnum.isbn
import ox
def valid_olid(id):
return id.startswith('OL') and id.endswith('M')
def get_positions(ids, pos):
'''
>>> get_positions([1,2,3,4], [2,4])
{2: 1, 4: 3}
'''
positions = {}
for i in pos:
try:
positions[i] = ids.index(i)
except:
pass
return positions
def get_by_key(objects, key, value):
obj = filter(lambda o: o.get(key) == value, objects)
return obj and obj[0] or None
def get_by_id(objects, id):
return get_by_key(objects, 'id', id)
def resize_image(data, width=None, size=None):
source = Image.open(StringIO(data)).convert('RGB')
source_width = source.size[0]
source_height = source.size[1]
if size:
if source_width > source_height:
width = size
height = int(width / (float(source_width) / source_height))
height = height - height % 2
else:
height = size
width = int(height * (float(source_width) / source_height))
width = width - width % 2
else:
height = int(width / (float(source_width) / source_height))
height = height - height % 2
width = max(width, 1)
height = max(height, 1)
if width < source_width:
resize_method = Image.ANTIALIAS
else:
resize_method = Image.BICUBIC
output = source.resize((width, height), resize_method)
o = StringIO()
output.save(o, format='jpeg')
data = o.getvalue()
o.close()
return data
def sort_title(title):
title = title.replace(u'Æ', 'Ae')
if isinstance(title, str):
title = unicode(title)
title = ox.sort_string(title)
#title
title = re.sub(u'[\'!¿¡,\.;\-"\:\*\[\]]', '', title)
return title.strip()
def normalize_isbn(value):
return ''.join([s for s in value if s.isdigit() or s == 'X'])
def find_isbns(text):
matches = re.compile('\d[\d\-X\ ]+').findall(text)
matches = [normalize_isbn(value) for value in matches]
return [isbn for isbn in matches if stdnum.isbn.is_valid(isbn)
and len(isbn) in (10, 13)
and isbn not in (
'0' * 10,
'0' * 13,
)]
def get_position_by_id(list, key):
for i in range(0, len(list)):
if list[i]['id'] == key:
return i
return -1