[lui1]

Here is a recipe for the `Nature' journal.

Nature Recipe

#!/usr/bin/env python2

from collections import defaultdict
from calibre.web.feeds.news import BasicNewsRecipe

BASE = 'https://www.nature.com'


def absurl(url):
  if url.startswith('/'):
      url = BASE + url
  elif url.startswith('http://'):
      url = 'https' + url[4:]
  return url


def check_words(words):
    return lambda x: x and frozenset(words.split()).intersection(x.split())


class Nature(BasicNewsRecipe):
    title = 'Nature'
    __author__ = 'Jose Ortiz'
    description = ('Nature is a weekly international multidisciplinary scientific journal'
                   ' publishing peer-reviewed research in all fields of science and'
                   ' technology on the basis of its originality, importance,'
                   ' interdisciplinary interest, timeliness, accessibility, elegance and'
                   ' surprising conclusions.  Nauture also provides rapid, authoritative,'
                   ' insightful and arresting news and interpretation of topical and coming'
                   ' trends affecting science, scientists and the wider public.')
    language = 'en'
    encoding = 'UTF-8'
    no_javascript = True
    no_stylesheets = True

    keep_only_tags = [
        dict(name='div',attrs={'data-component' : check_words('article-container')})
    ]

    remove_tags = [
        dict(attrs={'class' : check_words('hide-print')})
    ]

    def parse_index(self):
        soup = self.index_to_soup(BASE + '/nature/current-issue')
        self.cover_url = 'https:' + soup.find('img',attrs={'data-test' : 'issue-cover-image'})['src']
        section_tags = soup.find('div', {'data-container-type' : check_words('issue-section-list')})
        section_tags = section_tags.findAll('div', {'class' : check_words('article-section')})

        sections = defaultdict(list)
        ordered_sec_titles = []
        index = []

        for sec in section_tags:
            sec_title = self.tag_to_string(sec.find('h2'))
            ordered_sec_titles.append(sec_title)
            for article in sec.findAll('article'):
                title = self.tag_to_string(article.find('h3', {'itemprop' : check_words('name headline')}))
                date = ' [' + self.tag_to_string(article.find('time', {'itemprop' : check_words('datePublished')})) + ']'
                author = self.tag_to_string(article.find('li', {'itemprop' : check_words('creator')}))
                url =  absurl(article.find('a',{'itemprop' : check_words('url')})['href'])
                label = self.tag_to_string(article.find(attrs={'data-test' : check_words('article.type')}))
                description = label + ': ' + self.tag_to_string(article.find('div', attrs={'itemprop' : check_words('description')}))
                sections[sec_title].append(
                    {'title' : title, 'url' : url, 'description' : description, 'date' : date, 'author' : author})

        for k in ordered_sec_titles:
            index.append((k, sections[k]))
        return index

    def preprocess_html(self, soup):
        for img in soup.findAll('img',{'data-src' : True}):
            if img['data-src'].startswith('//'):
                img['src'] = 'https:' + img['data-src']
            else:
                img['src'] = img['data-src']
        return soup