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348 lines
13 KiB
Python
348 lines
13 KiB
Python
# -*- coding: utf8 -*-
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from __future__ import absolute_import
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from __future__ import division, print_function, unicode_literals
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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 breadability._compat import to_unicode
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from breadability.readable import (
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Article,
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get_class_weight,
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get_link_density,
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is_bad_link,
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leaf_div_elements_into_paragraphs,
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score_candidates,
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)
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from breadability.scoring import ScoredNode
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from .compat import unittest
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from .utils import load_snippet, load_article
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class TestReadableDocument(unittest.TestCase):
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"""Verify we can process html into a document to work off of."""
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def test_load_doc(self):
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"""We get back an element tree from our original doc"""
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doc = Article(load_snippet('document_min.html'))
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# We get back the document as a div tag currently by default.
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self.assertEqual(doc.readable_dom.tag, 'div')
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def test_title_loads(self):
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"""Verify we can fetch the title of the parsed article"""
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doc = Article(load_snippet('document_min.html'))
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self.assertEqual(
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doc._original_document.title,
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'Min Document Title'
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)
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def test_doc_no_scripts_styles(self):
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"""Step #1 remove all scripts from the document"""
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doc = Article(load_snippet('document_scripts.html'))
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readable = doc.readable_dom
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self.assertEqual(readable.findall(".//script"), [])
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self.assertEqual(readable.findall(".//style"), [])
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self.assertEqual(readable.findall(".//link"), [])
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def test_find_body_exists(self):
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"""If the document has a body, we store that as the readable html
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No sense processing anything other than the body content.
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"""
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doc = Article(load_snippet('document_min.html'))
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self.assertEqual(doc.readable_dom.tag, 'div')
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self.assertEqual(doc.readable_dom.get('id'), 'readabilityBody')
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def test_body_doesnt_exist(self):
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"""If we can't find a body, then we create one.
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We build our doc around the rest of the html we parsed.
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"""
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doc = Article(load_snippet('document_no_body.html'))
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self.assertEqual(doc.readable_dom.tag, 'div')
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self.assertEqual(doc.readable_dom.get('id'), 'readabilityBody')
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def test_bare_content(self):
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"""If the document is just pure content, no html tags we should be ok
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We build our doc around the rest of the html we parsed.
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"""
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doc = Article(load_snippet('document_only_content.html'))
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self.assertEqual(doc.readable_dom.tag, 'div')
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self.assertEqual(doc.readable_dom.get('id'), 'readabilityBody')
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def test_no_content(self):
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"""Without content we supply an empty unparsed doc."""
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doc = Article('')
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self.assertEqual(doc.readable_dom.tag, 'div')
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self.assertEqual(doc.readable_dom.get('id'), 'readabilityBody')
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self.assertEqual(doc.readable_dom.get('class'), 'parsing-error')
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class TestCleaning(unittest.TestCase):
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"""Test out our cleaning processing we do."""
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def test_unlikely_hits(self):
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"""Verify we wipe out things from our unlikely list."""
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doc = Article(load_snippet('test_readable_unlikely.html'))
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readable = doc.readable_dom
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must_not_appear = [
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'comment', 'community', 'disqus', 'extra', 'foot',
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'header', 'menu', 'remark', 'rss', 'shoutbox', 'sidebar',
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'sponsor', 'ad-break', 'agegate', 'pagination' '', 'pager',
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'popup', 'tweet', 'twitter', 'imgBlogpostPermalink']
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want_to_appear = ['and', 'article', 'body', 'column', 'main', 'shadow']
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for i in must_not_appear:
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# we cannot find any class or id with this value
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by_class = readable.find_class(i)
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for test in by_class:
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# if it's here it cannot have the must not class without the
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# want to appear class
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found = False
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for cls in test.get('class').split():
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if cls in want_to_appear:
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found = True
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self.assertTrue(found)
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by_ids = readable.get_element_by_id(i, False)
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if by_ids is not False:
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found = False
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for ids in test.get('id').split():
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if ids in want_to_appear:
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found = True
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self.assertTrue(found)
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def test_misused_divs_transform(self):
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"""Verify we replace leaf node divs with p's
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They should have the same content, just be a p vs a div
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"""
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test_html = "<html><body><div>simple</div></body></html>"
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test_doc = document_fromstring(test_html)
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self.assertEqual(
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tounicode(
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leaf_div_elements_into_paragraphs(test_doc)),
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to_unicode("<html><body><p>simple</p></body></html>")
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)
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test_html2 = ('<html><body><div>simple<a href="">link</a>'
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'</div></body></html>')
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test_doc2 = document_fromstring(test_html2)
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self.assertEqual(
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tounicode(
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leaf_div_elements_into_paragraphs(test_doc2)),
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to_unicode(
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'<html><body><p>simple<a href="">link</a></p></body></html>')
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)
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def test_dont_transform_div_with_div(self):
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"""Verify that only child <div> element is replaced by <p>."""
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dom = document_fromstring(
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"<html><body><div>text<div>child</div>"
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"aftertext</div></body></html>"
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)
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self.assertEqual(
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tounicode(
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leaf_div_elements_into_paragraphs(dom)),
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to_unicode(
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"<html><body><div>text<p>child</p>"
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"aftertext</div></body></html>"
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)
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)
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def test_bad_links(self):
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"""Some links should just not belong."""
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bad_links = [
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'<a name="amazonAndGoogleHaveMadeAnAudaciousGrabOfNamespaceOnTheInternetAsFarAsICanSeeTheresBeenNoMentionOfThisInTheTechPress"> </a>',
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'<a href="#amazonAndGoogleHaveMadeAnAudaciousGrabOfNamespaceOnTheInternetAsFarAsICanSeeTheresBeenNoMentionOfThisInTheTechPress"><img src="http://scripting.com/images/2001/09/20/sharpPermaLink3.gif" class="imgBlogpostPermalink" width="6" height="9" border="0" alt="permalink"></a>',
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'<a href="http://scripting.com/stories/2012/06/15/theTechPressIsOutToLunch.html#anExampleGoogleDoesntIntendToShareBlogAndItWillOnlyBeUsedToPointToBloggerSitesIfYouHaveATumblrOrWordpressBlogYouCantHaveABlogDomainHereIsTheAHrefhttpgtldresulticannorgapplicationresultapplicationstatusapplicationdetails527publicListingaOfGooglesAHrefhttpdropboxscriptingcomdavemiscgoogleblogapplicationhtmlapplicationa"><img src="http://scripting.com/images/2001/09/20/sharpPermaLink3.gif" class="imgBlogpostPermalink" width="6" height="9" border="0" alt="permalink"></a>'
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]
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for l in bad_links:
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link = fragment_fromstring(l)
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self.assertTrue(is_bad_link(link))
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class TestCandidateNodes(unittest.TestCase):
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"""Candidate nodes are scoring containers we use."""
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def test_candidate_scores(self):
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"""We should be getting back objects with some scores."""
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fives = ['<div/>']
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threes = ['<pre/>', '<td/>', '<blockquote/>']
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neg_threes = ['<address/>', '<ol/>']
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neg_fives = ['<h1/>', '<h2/>', '<h3/>', '<h4/>']
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for n in fives:
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doc = fragment_fromstring(n)
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self.assertEqual(ScoredNode(doc).content_score, 5)
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for n in threes:
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doc = fragment_fromstring(n)
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self.assertEqual(ScoredNode(doc).content_score, 3)
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for n in neg_threes:
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doc = fragment_fromstring(n)
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self.assertEqual(ScoredNode(doc).content_score, -3)
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for n in neg_fives:
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doc = fragment_fromstring(n)
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self.assertEqual(ScoredNode(doc).content_score, -5)
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def test_article_enables_candidate_access(self):
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"""Candidates are accessible after document processing."""
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doc = Article(load_article('ars.001.html'))
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self.assertTrue(hasattr(doc, 'candidates'))
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class TestClassWeights(unittest.TestCase):
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"""Certain ids and classes get us bonus points."""
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def test_positive_class(self):
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"""Some classes get us bonus points."""
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node = fragment_fromstring('<p class="article">')
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self.assertEqual(get_class_weight(node), 25)
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def test_positive_ids(self):
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"""Some ids get us bonus points."""
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node = fragment_fromstring('<p id="content">')
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self.assertEqual(get_class_weight(node), 25)
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def test_negative_class(self):
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"""Some classes get us negative points."""
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node = fragment_fromstring('<p class="comment">')
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self.assertEqual(get_class_weight(node), -25)
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def test_negative_ids(self):
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"""Some ids get us negative points."""
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node = fragment_fromstring('<p id="media">')
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self.assertEqual(get_class_weight(node), -25)
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class TestScoringNodes(unittest.TestCase):
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"""We take out list of potential nodes and score them up."""
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def test_we_get_candidates(self):
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"""Processing candidates should get us a list of nodes to try out."""
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doc = document_fromstring(load_article("ars.001.html"))
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test_nodes = tuple(doc.iter("p", "td", "pre"))
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candidates = score_candidates(test_nodes)
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# this might change as we tweak our algorithm, but if it does,
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# it signifies we need to look at what we changed.
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self.assertEqual(len(candidates.keys()), 37)
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# one of these should have a decent score
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scores = sorted(c.content_score for c in candidates.values())
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self.assertTrue(scores[-1] > 100)
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def test_bonus_score_per_100_chars_in_p(self):
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"""Nodes get 1 point per 100 characters up to max. 3 points."""
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def build_candidates(length):
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html = "<p>%s</p>" % ("c" * length)
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node = fragment_fromstring(html)
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return [node]
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test_nodes = build_candidates(50)
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candidates = score_candidates(test_nodes)
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pscore_50 = max(c.content_score for c in candidates.values())
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test_nodes = build_candidates(100)
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candidates = score_candidates(test_nodes)
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pscore_100 = max(c.content_score for c in candidates.values())
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test_nodes = build_candidates(300)
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candidates = score_candidates(test_nodes)
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pscore_300 = max(c.content_score for c in candidates.values())
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test_nodes = build_candidates(400)
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candidates = score_candidates(test_nodes)
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pscore_400 = max(c.content_score for c in candidates.values())
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self.assertAlmostEqual(pscore_50 + 0.5, pscore_100)
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self.assertAlmostEqual(pscore_100 + 2.0, pscore_300)
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self.assertAlmostEqual(pscore_300, pscore_400)
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class TestLinkDensityScoring(unittest.TestCase):
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"""Link density will adjust out candidate scoresself."""
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def test_link_density(self):
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"""Test that we get a link density"""
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doc = document_fromstring(load_article('ars.001.html'))
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for node in doc.iter('p', 'td', 'pre'):
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density = get_link_density(node)
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# the density must be between 0, 1
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self.assertTrue(density >= 0.0 and density <= 1.0)
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class TestSiblings(unittest.TestCase):
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"""Siblings will be included if their content is related."""
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@unittest.skip("Not implemented yet.")
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def test_bad_siblings_not_counted(self):
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raise NotImplementedError()
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@unittest.skip("Not implemented yet.")
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def test_good_siblings_counted(self):
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raise NotImplementedError()
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class TestMainText(unittest.TestCase):
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def test_empty(self):
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article = Article("")
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annotated_text = article.main_text
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self.assertEqual(annotated_text, [])
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def test_no_annotations(self):
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article = Article("<div><p>This is text with no annotations</p></div>")
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annotated_text = article.main_text
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self.assertEqual(annotated_text,
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[(("This is text with no annotations", None),)])
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def test_one_annotation(self):
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article = Article("<div><p>This is text\r\twith <del>no</del> annotations</p></div>")
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annotated_text = article.main_text
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expected = [(
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("This is text\nwith", None),
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("no", ("del",)),
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("annotations", None),
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)]
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self.assertEqual(annotated_text, expected)
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def test_simple_snippet(self):
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snippet = Article(load_snippet("annotated_1.html"))
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annotated_text = snippet.main_text
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expected = [
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(
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("Paragraph is more", None),
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("better", ("em",)),
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(".\nThis text is very", None),
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("pretty", ("strong",)),
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("'cause she's girl.", None),
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),
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(
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("This is not", None),
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("crap", ("big",)),
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("so", None),
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("readability", ("dfn",)),
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("me :)", None),
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)
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]
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self.assertEqual(annotated_text, expected)
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