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135 lines
3.7 KiB
Python
135 lines
3.7 KiB
Python
from cleaners import normalize_spaces, clean_attributes
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from encoding import get_encoding
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from lxml.html import tostring
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import logging
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import lxml.html
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import re
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log = logging.getLogger(__name__)
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utf8_parser = lxml.html.HTMLParser(encoding='utf-8')
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def lxml_fromstring(doc):
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return lxml.html.document_fromstring(doc, parser=utf8_parser)
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def build_doc(page):
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if isinstance(page, unicode):
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enc = None
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unicode_page = page
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else:
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enc = get_encoding(page) or 'utf-8'
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unicode_page = page.decode(enc, 'replace')
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doc = lxml_fromstring(unicode_page.encode('utf-8', 'replace').replace('\r', ''))
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return doc, enc
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def js_re(src, pattern, flags, repl):
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return re.compile(pattern, flags).sub(src, repl.replace('$', '\\'))
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def normalize_entities(cur_title):
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entities = {
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u'\u2014': '-',
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u'\u2013': '-',
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u'—': '-',
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u'–': '-',
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u'\u00A0': ' ',
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u'\u00AB': '"',
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u'\u00BB': '"',
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u'"': '"',
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}
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for c, r in entities.iteritems():
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if c in cur_title:
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cur_title = cur_title.replace(c, r)
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return cur_title
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def norm_title(title):
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return normalize_entities(normalize_spaces(title))
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def get_title(doc):
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title = doc.find('.//title')
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if title is None or len(title.text) == 0:
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return '[no-title]'
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return norm_title(title.text)
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def add_match(collection, text, orig):
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text = norm_title(text)
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if len(text.split()) >= 2 and len(text) >= 15:
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if text.replace('"', '') in orig.replace('"', ''):
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collection.add(text)
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TITLE_CSS_HEURISTICS = ['#title', '#head', '#heading', '.pageTitle',
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'.news_title', '.title', '.head', '.heading',
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'.contentheading', '.small_header_red']
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def shorten_title(doc):
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title = doc.find('.//title')
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if title is None or title.text is None or len(title.text) == 0:
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return ''
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title = orig = norm_title(title.text)
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candidates = set()
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for item in ['.//h1', './/h2', './/h3']:
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for e in list(doc.iterfind(item)):
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if e.text:
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add_match(candidates, e.text, orig)
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if e.text_content():
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add_match(candidates, e.text_content(), orig)
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for item in TITLE_CSS_HEURISTICS:
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for e in doc.cssselect(item):
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if e.text:
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add_match(candidates, e.text, orig)
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if e.text_content():
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add_match(candidates, e.text_content(), orig)
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if candidates:
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title = sorted(candidates, key=len)[-1]
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else:
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for delimiter in [' | ', ' - ', ' :: ', ' / ']:
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if delimiter in title:
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parts = orig.split(delimiter)
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if len(parts[0].split()) >= 4:
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title = parts[0]
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break
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elif len(parts[-1].split()) >= 4:
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title = parts[-1]
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break
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else:
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if ': ' in title:
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parts = orig.split(': ')
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if len(parts[-1].split()) >= 4:
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title = parts[-1]
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else:
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title = orig.split(': ', 1)[1]
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if not 15 < len(title) < 150:
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return orig
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return title
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def get_body(doc):
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for elem in doc.xpath('.//script | .//link | .//style'):
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elem.drop_tree()
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raw_html = unicode(tostring(doc.body or doc))
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cleaned = clean_attributes(raw_html)
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try:
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#BeautifulSoup(cleaned) #FIXME do we really need to try loading it?
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return cleaned
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except Exception: # FIXME find the equivalent lxml error
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log.error("cleaning broken html content: "
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"%s\n---------\n%s" % (raw_html, cleaned))
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return raw_html
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