def parse_published_field(entry, post):
    time_fields = ['published', 'created', 'updated', 'modified']

    for key in time_fields:
        value = getattr(entry, '%s_parsed' % key, None)
        if value:
            post.published = datetime.datetime.fromtimestamp(time.mktime(value))
            break

    if not post.published:
        for key in time_fields:
            value = getattr(entry, key, None)
            if value:
                if not feed.parsed_with_success:
                    post.published = datetime.datetime(1970, 1, 1)
                else:
                    post.published = datetime.datetime.now()
                post.published_unparsed = value
                break

    if not post.published:
        raise ProcessingError('Could not parse published date of entry %s' % entry.link)


def parse_content_fields(entry, post):
    body = ''
    if hasattr(entry, 'content'):
        mapping = dict((x.type, x.value) for x in entry.content)
        if 'text/html' in mapping:
            body = mapping['text/html']
        elif 'application/xhtml+xml' in mapping:
            body = mapping['application/xhtml+xml']
        else:
            body = mapping.values()[0]

    if hasattr(entry, 'summary') and len(entry.summary) > body:
        body = entry.summary

    if hasattr(entry, 'description') and len(entry.description) > body:
        body = entry.summary

    lxml_body = fromstring(body)
    lxml_quote = fromstring(body[:QUOTE_SIZE])
    post.body_html = tostring(lxml_body, encoding='utf-8')
    post.quote_html = tostring(lxml_quote, encoding='utf-8')
    post.body_text = unicode(lxml_body.text_content())
    post.quote_text = unicode(lxml_quote.text_content())