openmedialibrary/oml/meta/utils.py

# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4


import re
import stdnum.isbn

import ox
import ox.iso

def to_isbn13(isbn):
    try:
        isbn = stdnum.isbn.validate(isbn, True)
        if isbn[:2] != '97':
            isbn = None
    except:
        isbn = None
    return isbn

def normalize_isbn(value):
    return ''.join([s for s in value if s.isdigit() or s == 'X'])

def find_isbns(text):
    if isinstance(text, bytes):
        text = text.decode()
    matches = re.compile('\d[\d\-X\u2013–\ ]+').findall(text)
    matches = [normalize_isbn(value) for value in matches]
    matches = [to_isbn13(value) for value in matches]
    matches = list(set([value for value in matches if value]))
    return matches

def get_language(lang):
    return ox.iso.codeToLang(lang.split('-')[0]) or lang

def decode_html_data(data):
    if isinstance(data, dict):
        for key in data:
            data[key] = decode_html_data(data[key])
    elif isinstance(data, list):
        data = [decode_html_data(v) for v in data]
    elif isinstance(data, str):
        data = ox.decode_html(data)
    return data