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659 lines
26 KiB
Python
659 lines
26 KiB
Python
#!/usr/bin/env python
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import logging
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import re
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import sys
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from lxml.etree import tostring
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from lxml.etree import tounicode
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from lxml.html import document_fromstring
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from lxml.html import fragment_fromstring
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from .cleaners import clean_attributes
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from .cleaners import html_cleaner
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from .htmls import build_doc
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from .htmls import get_body
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from .htmls import get_title
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from .htmls import shorten_title
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from encoding import get_encoding
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from debug import describe, text_content, open_in_browser
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log = logging.getLogger(__file__)
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REGEXES = {
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'unlikelyCandidatesRe': re.compile('combx|comment|community|disqus|extra|foot|header|menu|remark|rss|shoutbox|sidebar|sponsor|ad-break|agegate|pagination|pager|popup|tweet|twitter', re.I),
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'okMaybeItsACandidateRe': re.compile('and|article|body|column|main|shadow', re.I),
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'positiveRe': re.compile('article|body|content|entry|hentry|main|page|pagination|post|text|blog|story', re.I),
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'negativeRe': re.compile('combx|comment|com-|contact|foot|footer|footnote|masthead|media|meta|outbrain|promo|related|scroll|shoutbox|sidebar|sponsor|shopping|tags|tool|widget', re.I),
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'divToPElementsRe': re.compile('<(a|blockquote|dl|div|img|ol|p|pre|table|ul)', re.I),
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#'replaceBrsRe': re.compile('(<br[^>]*>[ \n\r\t]*){2,}',re.I),
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#'replaceFontsRe': re.compile('<(\/?)font[^>]*>',re.I),
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#'trimRe': re.compile('^\s+|\s+$/'),
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#'normalizeRe': re.compile('\s{2,}/'),
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#'killBreaksRe': re.compile('(<br\s*\/?>(\s| ?)*){1,}/'),
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#'videoRe': re.compile('http:\/\/(www\.)?(youtube|vimeo)\.com', re.I),
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#skipFootnoteLink: /^\s*(\[?[a-z0-9]{1,2}\]?|^|edit|citation needed)\s*$/i,
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}
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class Unparseable(ValueError):
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pass
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def to_int(x):
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if not x:
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return None
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x = x.strip()
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if x.endswith('px'):
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return int(x[:-2])
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if x.endswith('em'):
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return int(x[:-2]) * 12
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return int(x)
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def clean(text):
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text = re.sub('[ \t]+', ' ', text)
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text = re.sub('\s*\n\s*', '\n', text)
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return text.strip()
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def text_length(i):
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return len(clean(i.text_content() or ""))
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regexp_type = type(re.compile('hello, world'))
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def compile_pattern(elements):
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if not elements:
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return None
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if isinstance(elements, regexp_type):
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return elements
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if isinstance(elements, _basestring):
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elements = elements.split(',')
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return re.compile(u'|'.join([re.escape(x.lower()) for x in elements]), re.U)
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class Document:
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"""Class to build a etree document out of html."""
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TEXT_LENGTH_THRESHOLD = 25
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RETRY_LENGTH = 250
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def __init__(self, input, positive_keywords=None, negative_keywords=None,
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**options):
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"""Generate the document
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:param input: string of the html content.
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kwargs:
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- attributes:
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- min_text_length:
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- retry_length:
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- url: will allow adjusting links to be absolute
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- positive_keywords: the list of positive search patterns in
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classes and ids, for example: ["news-item", "block"]
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- negative_keywords: the list of negative
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search patterns in classes
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and ids, for example: ["mysidebar", "related", "ads"]
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Also positive_keywords and negative_keywords could be a regexp.
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"""
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self.input = input
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self.options = options
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self.html = None
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self.encoding = None
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self.positive_keywords = compile_pattern(positive_keywords)
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self.negative_keywords = compile_pattern(negative_keywords)
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def _html(self, force=False):
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if force or self.html is None:
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self.html = self._parse(self.input)
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return self.html
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def _parse(self, input):
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doc, self.encoding = build_doc(input)
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doc = html_cleaner.clean_html(doc)
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base_href = self.options.get('url', None)
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if base_href:
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doc.make_links_absolute(base_href, resolve_base_href=True)
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else:
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doc.resolve_base_href()
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if self.options.get('xpath'):
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root = doc.getroottree()
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for i in doc.getiterator():
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#print root.getpath(i)
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i.attrib['x'] = root.getpath(i)
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return doc
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def content(self):
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return get_body(self._html(True))
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def title(self):
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return get_title(self._html(True))
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def short_title(self):
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return shorten_title(self._html(True))
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def get_clean_html(self):
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return clean_attributes(tounicode(self.html))
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def summary(self, html_partial=False):
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"""Generate the summary of the html docuemnt
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:param html_partial: return only the div of the document, don't wrap
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in html and body tags.
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"""
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try:
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ruthless = True
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while True:
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self._html(True)
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for i in self.tags(self.html, 'script', 'style'):
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i.drop_tree()
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for i in self.tags(self.html, 'body'):
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i.set('id', 'readabilityBody')
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if ruthless:
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self.remove_unlikely_candidates()
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self.transform_misused_divs_into_paragraphs()
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candidates = self.score_paragraphs()
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best_candidate = self.select_best_candidate(candidates)
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if best_candidate:
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article = self.get_article(candidates, best_candidate,
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html_partial=html_partial)
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else:
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if ruthless:
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log.info("ruthless removal did not work. ")
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ruthless = False
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log.info(
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("ended up stripping too much - "
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"going for a safer parse"))
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# try again
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continue
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else:
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log.info(
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("Ruthless and lenient parsing did not work. "
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"Returning raw html"))
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article = self.html.find('body')
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if article is None:
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article = self.html
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cleaned_article = self.sanitize(article, candidates)
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article_length = len(cleaned_article or '')
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retry_length = self.options.get(
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'retry_length',
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self.RETRY_LENGTH)
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of_acceptable_length = article_length >= retry_length
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if ruthless and not of_acceptable_length:
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ruthless = False
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# Loop through and try again.
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continue
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else:
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return cleaned_article
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except Exception as e:
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log.exception('error getting summary: ')
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raise Unparseable(str(e)), None, sys.exc_info()[2]
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def get_article(self, candidates, best_candidate, html_partial=False):
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# Now that we have the top candidate, look through its siblings for
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# content that might also be related.
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# Things like preambles, content split by ads that we removed, etc.
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sibling_score_threshold = max([
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10,
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best_candidate['content_score'] * 0.2])
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# create a new html document with a html->body->div
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if html_partial:
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output = fragment_fromstring('<div/>')
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else:
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output = document_fromstring('<div/>')
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best_elem = best_candidate['elem']
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for sibling in best_elem.getparent().getchildren():
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# in lxml there no concept of simple text
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# if isinstance(sibling, NavigableString): continue
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append = False
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if sibling is best_elem:
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append = True
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sibling_key = sibling # HashableElement(sibling)
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if sibling_key in candidates and \
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candidates[sibling_key]['content_score'] >= \
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sibling_score_threshold:
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append = True
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if sibling.tag == "p":
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link_density = self.get_link_density(sibling)
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node_content = sibling.text or ""
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node_length = len(node_content)
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if node_length > 80 and link_density < 0.25:
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append = True
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elif node_length <= 80 \
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and link_density == 0 \
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and re.search('\.( |$)', node_content):
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append = True
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if append:
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# We don't want to append directly to output, but the div
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# in html->body->div
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if html_partial:
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output.append(sibling)
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else:
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output.getchildren()[0].getchildren()[0].append(sibling)
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# if output is not None:
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# output.append(best_elem)
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return output
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def select_best_candidate(self, candidates):
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if not candidates:
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return None
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sorted_candidates = sorted(
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candidates.values(),
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key=lambda x: x['content_score'],
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reverse=True
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)
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for candidate in sorted_candidates[:5]:
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elem = candidate['elem']
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log.info("Top 5 : %6.3f %s" % (
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candidate['content_score'],
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describe(elem)))
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best_candidate = sorted_candidates[0]
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return best_candidate
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def get_link_density(self, elem):
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link_length = 0
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for i in elem.findall(".//a"):
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link_length += text_length(i)
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#if len(elem.findall(".//div") or elem.findall(".//p")):
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# link_length = link_length
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total_length = text_length(elem)
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return float(link_length) / max(total_length, 1)
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def score_paragraphs(self, ):
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MIN_LEN = self.options.get(
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'min_text_length',
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self.TEXT_LENGTH_THRESHOLD)
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candidates = {}
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ordered = []
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for elem in self.tags(self._html(), "p", "pre", "td"):
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parent_node = elem.getparent()
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if parent_node is None:
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continue
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grand_parent_node = parent_node.getparent()
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inner_text = clean(elem.text_content() or "")
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inner_text_len = len(inner_text)
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# If this paragraph is less than 25 characters
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# don't even count it.
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if inner_text_len < MIN_LEN:
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continue
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if parent_node not in candidates:
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candidates[parent_node] = self.score_node(parent_node)
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ordered.append(parent_node)
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if grand_parent_node is not None and \
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grand_parent_node not in candidates:
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candidates[grand_parent_node] = self.score_node(
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grand_parent_node)
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ordered.append(grand_parent_node)
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content_score = 1
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content_score += len(inner_text.split(','))
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content_score += min((inner_text_len / 100), 3)
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#if elem not in candidates:
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# candidates[elem] = self.score_node(elem)
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#WTF? candidates[elem]['content_score'] += content_score
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candidates[parent_node]['content_score'] += content_score
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if grand_parent_node is not None:
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candidates[grand_parent_node]['content_score'] += content_score / 2.0
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# Scale the final candidates score based on link density. Good content
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# should have a relatively small link density (5% or less) and be
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# mostly unaffected by this operation.
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for elem in ordered:
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candidate = candidates[elem]
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ld = self.get_link_density(elem)
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score = candidate['content_score']
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log.debug("Branch %6.3f %s link density %.3f -> %6.3f" % (
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score, describe(elem), ld, score * (1 - ld)))
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candidate['content_score'] *= (1 - ld)
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return candidates
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def class_weight(self, e):
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weight = 0
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for feature in [e.get('class', None), e.get('id', None)]:
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if feature:
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if REGEXES['negativeRe'].search(feature):
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weight -= 25
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if REGEXES['positiveRe'].search(feature):
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weight += 25
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if self.positive_keywords and self.positive_keywords.search(
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feature):
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weight += 25
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if self.negative_keywords and self.negative_keywords.search(
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feature):
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weight -= 25
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if self.positive_keywords and self.positive_keywords.match(
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'tag-' + e.tag):
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weight += 25
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if self.negative_keywords and self.negative_keywords.match(
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'tag-' + e.tag):
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weight -= 25
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return weight
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def score_node(self, elem):
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content_score = self.class_weight(elem)
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name = elem.tag.lower()
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if name == "div":
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content_score += 5
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elif name in ["pre", "td", "blockquote"]:
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content_score += 3
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elif name in ["address", "ol", "ul", "dl", "dd", "dt", "li", "form"]:
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content_score -= 3
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elif name in ["h1", "h2", "h3", "h4", "h5", "h6", "th"]:
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content_score -= 5
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return {
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'content_score': content_score,
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'elem': elem
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}
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def debug(self, *a):
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log.warn("debug: " + a[0], *a[1:])
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def remove_unlikely_candidates(self):
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for elem in self.html.iter():
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s = "%s %s" % (elem.get('class', ''), elem.get('id', ''))
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if len(s) < 2:
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continue
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#self.debug(s)
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if REGEXES['unlikelyCandidatesRe'].search(s) and (not REGEXES['okMaybeItsACandidateRe'].search(s)) and elem.tag not in ['html', 'body']:
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log.debug("Removing unlikely candidate - %s" % describe(elem))
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elem.drop_tree()
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def transform_misused_divs_into_paragraphs(self):
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for elem in self.tags(self.html, 'div'):
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# transform <div>s that do not contain other block elements into
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# <p>s
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# FIXME: The current implementation ignores all descendants that
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# are not direct children of elem
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# This results in incorrect results in case there is an <img>
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# buried within an <a> for example
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if not REGEXES['divToPElementsRe'].search(
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unicode(''.join(map(tostring, list(elem))))):
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# self.debug("Altering %s to p" % describe(elem))
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elem.tag = "p"
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# self.debug("Fixed element "+describe(elem))
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for elem in self.tags(self.html, 'div'):
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if elem.text and elem.text.strip():
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p = fragment_fromstring('<p/>')
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p.text = elem.text
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elem.text = None
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elem.insert(0, p)
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# print "Appended "+tounicode(p)+" to "+describe(elem)
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for pos, child in reversed(list(enumerate(elem))):
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if child.tail and child.tail.strip():
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p = fragment_fromstring('<p/>')
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p.text = child.tail
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child.tail = None
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elem.insert(pos + 1, p)
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# print "Inserted "+tounicode(p)+" to "+describe(elem)
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if child.tag == 'br':
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# print 'Dropped <br> at '+describe(elem)
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child.drop_tree()
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def tags(self, node, *tag_names):
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for tag_name in tag_names:
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for e in node.findall('.//%s' % tag_name):
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yield e
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def reverse_tags(self, node, *tag_names):
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for tag_name in tag_names:
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for e in reversed(node.findall('.//%s' % tag_name)):
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yield e
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def sanitize(self, node, candidates):
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MIN_LEN = self.options.get('min_text_length', self.TEXT_LENGTH_THRESHOLD)
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for header in self.tags(node, "h1", "h2", "h3", "h4", "h5", "h6"):
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if self.class_weight(header) < 0 or \
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self.get_link_density(header) > 0.33:
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header.drop_tree()
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for elem in self.tags(node, "form", "iframe", "textarea"):
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elem.drop_tree()
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allowed = {}
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# Conditionally clean <table>s, <ul>s, and <div>s
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for el in self.reverse_tags(node, "table", "ul", "div"):
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if el in allowed:
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continue
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weight = self.class_weight(el)
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if el in candidates:
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content_score = candidates[el]['content_score']
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# print '!',el, '-> %6.3f' % content_score
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else:
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content_score = 0
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tag = el.tag
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if weight + content_score < 0:
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log.info("Removed %s with score %6.3f and weight %-3s" %
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(describe(el), content_score, weight, ))
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el.drop_tree()
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elif el.text_content().count(",") < 10:
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counts = {}
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for kind in ['p', 'img', 'li', 'a', 'embed', 'input']:
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counts[kind] = len(el.findall('.//%s' % kind))
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counts["li"] -= 100
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counts["input"] -= len(el.findall('.//input[@type="hidden"]'))
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# Count the text length excluding any surrounding whitespace
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content_length = text_length(el)
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link_density = self.get_link_density(el)
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parent_node = el.getparent()
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if parent_node is not None:
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if parent_node in candidates:
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content_score = candidates[
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parent_node]['content_score']
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else:
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content_score = 0
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# if parent_node is not None:
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# pweight = self.class_weight(parent_node) + content_score
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# pname = describe(parent_node)
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# else:
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# pweight = 0
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# pname = "no parent"
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to_remove = False
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reason = ""
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# if el.tag == 'div' and counts["img"] >= 1:
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# continue
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if content_length and counts["img"] * 100 >= content_length:
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reason = "too many images (%s) for text " % counts["img"]
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to_remove = True
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elif counts["li"] > counts["p"] \
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and tag != "ul" and tag != "ol":
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reason = "more <li>s than <p>s"
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to_remove = True
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elif counts["input"] > (counts["p"] / 3):
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reason = "less than 3x <p>s than <input>s"
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to_remove = True
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elif content_length < MIN_LEN and not counts["img"]:
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reason = "too short content length %s and no images" % content_length
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to_remove = True
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elif content_length < MIN_LEN and counts["img"] > 2:
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reason = "too short content length %s and too much images" % content_length
|
|
to_remove = True
|
|
elif weight < 25 and link_density > 0.2:
|
|
reason = "too many links %.3f for its weight %s" % (
|
|
link_density, weight)
|
|
to_remove = True
|
|
elif weight >= 25 and link_density > 0.5:
|
|
reason = "too many links %.3f for its weight %s" % (
|
|
link_density, weight)
|
|
to_remove = True
|
|
elif (counts["embed"] == 1 and content_length < 75) or counts["embed"] > 1:
|
|
reason = "<embed>s with too short content length, or too many <embed>s"
|
|
to_remove = True
|
|
elif not content_length:
|
|
reason = "no content"
|
|
to_remove = True
|
|
# if el.tag == 'div' and counts['img'] >= 1 and to_remove:
|
|
# imgs = el.findall('.//img')
|
|
# valid_img = False
|
|
# self.debug(tounicode(el))
|
|
# for img in imgs:
|
|
#
|
|
# height = img.get('height')
|
|
# text_length = img.get('text_length')
|
|
# self.debug ("height %s text_length %s" %(repr(height), repr(text_length)))
|
|
# if to_int(height) >= 100 or to_int(text_length) >= 100:
|
|
# valid_img = True
|
|
# self.debug("valid image" + tounicode(img))
|
|
# break
|
|
# if valid_img:
|
|
# to_remove = False
|
|
# self.debug("Allowing %s" %el.text_content())
|
|
# for desnode in self.tags(el, "table", "ul", "div"):
|
|
# allowed[desnode] = True
|
|
|
|
#find x non empty preceding and succeeding siblings
|
|
i, j = 0, 0
|
|
x = 1
|
|
siblings = []
|
|
for sib in el.itersiblings():
|
|
#self.debug(sib.text_content())
|
|
sib_content_length = text_length(sib)
|
|
if sib_content_length:
|
|
i += 1
|
|
siblings.append(sib_content_length)
|
|
if i >= x:
|
|
break
|
|
for sib in el.itersiblings(preceding=True):
|
|
#self.debug(sib.text_content())
|
|
sib_content_length = text_length(sib)
|
|
if sib_content_length:
|
|
j += 1
|
|
siblings.append(sib_content_length)
|
|
if j >= x:
|
|
break
|
|
#self.debug(str(siblings))
|
|
if siblings and sum(siblings) > 1000:
|
|
to_remove = False
|
|
log.info("Allowing %s" % describe(el))
|
|
for desnode in self.tags(el, "table", "ul", "div"):
|
|
allowed[desnode] = True
|
|
|
|
if to_remove:
|
|
log.info("Cleaned %s (score=%6.3f, weight=%s) cause it has %s: %s" %
|
|
(describe(el), content_score, weight, reason, text_content(el)))
|
|
#print tounicode(el)
|
|
#self.debug("pname %s pweight %.3f" %(pname, pweight))
|
|
el.drop_tree()
|
|
else:
|
|
log.info("Not cleaned %s of length %s: %s" %
|
|
(describe(el), content_length, text_content(el)))
|
|
|
|
for el in ([node] + [n for n in node.iter()]):
|
|
if not self.options.get('attributes', None):
|
|
# el.attrib = {} #FIXME:Checkout the effects of disabling this
|
|
pass
|
|
|
|
self.html = node
|
|
return self.get_clean_html()
|
|
|
|
|
|
class HashableElement():
|
|
def __init__(self, node):
|
|
self.node = node
|
|
self._path = None
|
|
|
|
def _get_path(self):
|
|
if self._path is None:
|
|
reverse_path = []
|
|
node = self.node
|
|
while node is not None:
|
|
node_id = (node.tag, tuple(node.attrib.items()), node.text)
|
|
reverse_path.append(node_id)
|
|
node = node.getparent()
|
|
self._path = tuple(reverse_path)
|
|
return self._path
|
|
path = property(_get_path)
|
|
|
|
def __hash__(self):
|
|
return hash(self.path)
|
|
|
|
def __eq__(self, other):
|
|
return self.path == other.path
|
|
|
|
def __getattr__(self, tag):
|
|
return getattr(self.node, tag)
|
|
|
|
VERBOSITY = {
|
|
1: logging.WARNING,
|
|
2: logging.INFO,
|
|
3: logging.DEBUG
|
|
}
|
|
|
|
|
|
def main():
|
|
from optparse import OptionParser
|
|
parser = OptionParser(usage="%prog: [options] [file]")
|
|
parser.add_option('-v', '--verbose', action='count', default=0)
|
|
parser.add_option('-b', '--browser', default=None, action='store_true', help="open in browser")
|
|
parser.add_option('-l', '--log', default=None, help="use filename for logs (appended)")
|
|
parser.add_option('-u', '--url', default=None, help="use URL instead of a local file")
|
|
parser.add_option('-s', '--show-xpath', default=None, help="show xpath")
|
|
parser.add_option('-x', '--xpath', default=None, help="use xpath")
|
|
parser.add_option('-t', '--support-text', default=None, help="use this support text")
|
|
parser.add_option('-p', '--positive-keywords', default=None, help="positive keywords (separated with comma)", action='store')
|
|
parser.add_option('-n', '--negative-keywords', default=None, help="negative keywords (separated with comma)", action='store')
|
|
(options, args) = parser.parse_args()
|
|
|
|
if not (len(args) == 1 or options.url):
|
|
parser.print_help()
|
|
sys.exit(1)
|
|
|
|
if options.verbose:
|
|
logging.basicConfig(level=VERBOSITY[options.verbose], filename=options.log,
|
|
format='%(asctime)s: %(levelname)s: %(message)s (at %(filename)s: %(lineno)d)')
|
|
|
|
file = None
|
|
if options.url:
|
|
import urllib
|
|
file = urllib.urlopen(options.url)
|
|
else:
|
|
file = open(args[0], 'rt')
|
|
html = file.read() # bytes object
|
|
|
|
encoding = get_encoding(html)
|
|
html = html.decode(encoding)
|
|
try:
|
|
doc = Document(html, url=options.url,
|
|
positive_keywords=options.positive_keywords,
|
|
negative_keywords=options.negative_keywords)
|
|
if options.browser:
|
|
result = 'Title: ' + doc.short_title() + '<br/>' + doc.summary()
|
|
open_in_browser(result)
|
|
else:
|
|
# XXX: a hack, better to set PYTHONIOENCODING explicitly
|
|
output_encoding = sys.__stdout__.encoding or 'utf-8'
|
|
|
|
print 'Title:', doc.short_title().encode(output_encoding, 'replace')
|
|
print doc.summary().encode(output_encoding, 'replace')
|
|
finally:
|
|
file.close()
|
|
|
|
if __name__ == '__main__':
|
|
main()
|