from cleaners import normalize_spaces, clean_attributes

from encoding import get_encoding

from lxml.html import tostring

import logging

import lxml.html

import re

log = logging.getLogger(__name__)

utf8_parser = lxml.html.HTMLParser(encoding='utf-8')

def lxml_fromstring(doc):

return lxml.html.document_fromstring(doc, parser=utf8_parser)

def build_doc(page):

if isinstance(page, unicode):

enc = None

unicode_page = page

else:

enc = get_encoding(page) or 'utf-8'

unicode_page = page.decode(enc, 'replace')

doc = lxml_fromstring(unicode_page.encode('utf-8', 'replace').replace('\r', ''))

return doc, enc

def js_re(src, pattern, flags, repl):

return re.compile(pattern, flags).sub(src, repl.replace('$', '\\'))

def normalize_entities(cur_title):

entities = {

u'\u2014': '-',

u'\u2013': '-',

u'—': '-',

u'–': '-',

u'\u00A0': ' ',

u'\u00AB': '"',

u'\u00BB': '"',

u'"': '"',

}

for c, r in entities.iteritems():

if c in cur_title:

cur_title = cur_title.replace(c, r)

return cur_title

def norm_title(title):

return normalize_entities(normalize_spaces(title))

def get_title(doc):

title = doc.find('.//title')

if title is None or len(title.text) == 0:

return '[no-title]'

return norm_title(title.text)

def add_match(collection, text, orig):

text = norm_title(text)

if len(text.split()) >= 2 and len(text) >= 15:

if text.replace('"', '') in orig.replace('"', ''):

collection.add(text)

TITLE_CSS_HEURISTICS = ['#title', '#head', '#heading', '.pageTitle',

'.news_title', '.title', '.head', '.heading',

'.contentheading', '.small_header_red']

def shorten_title(doc):

title = doc.find('.//title')

if title is None or title.text is None or len(title.text) == 0:

return ''

title = orig = norm_title(title.text)

candidates = set()

for item in ['.//h1', './/h2', './/h3']:

for e in list(doc.iterfind(item)):

if e.text:

add_match(candidates, e.text, orig)

if e.text_content():

add_match(candidates, e.text_content(), orig)

for item in TITLE_CSS_HEURISTICS:

for e in doc.cssselect(item):

if e.text:

add_match(candidates, e.text, orig)

if e.text_content():

add_match(candidates, e.text_content(), orig)

if candidates:

title = sorted(candidates, key=len)[-1]

else:

for delimiter in [' | ', ' - ', ' :: ', ' / ']:

if delimiter in title:

parts = orig.split(delimiter)

if len(parts[0].split()) >= 4:

title = parts[0]

break

elif len(parts[-1].split()) >= 4:

title = parts[-1]

break

else:

if ': ' in title:

parts = orig.split(': ')

if len(parts[-1].split()) >= 4:

title = parts[-1]

else:

title = orig.split(': ', 1)[1]

if not 15 < len(title) < 150:

return orig

return title

def get_body(doc):

for elem in doc.xpath('.//script | .//link | .//style'):

elem.drop_tree()

raw_html = unicode(tostring(doc.body or doc))

cleaned = clean_attributes(raw_html)

try:

#BeautifulSoup(cleaned) #FIXME do we really need to try loading it?

return cleaned

except Exception: # FIXME find the equivalent lxml error

log.error("cleaning broken html content: "

"%s\n---------\n%s" % (raw_html, cleaned))

return raw_html