Merge Jerry: pull in initial set of regression tests

0.3.0.dev
Richard Harding 12 years ago
commit 9366436861

@ -0,0 +1,528 @@
#!/usr/bin/env python
from cleaners import html_cleaner, clean_attributes
from collections import defaultdict
from htmls import build_doc, get_body, get_title, shorten_title
from lxml.etree import tostring, tounicode
from lxml.html import fragment_fromstring, document_fromstring
from lxml.html import builder as B
import logging
import re
import sys
logging.basicConfig(level=logging.INFO)
REGEXES = {
'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),
'okMaybeItsACandidateRe': re.compile('and|article|body|column|main|shadow',re.I),
'positiveRe': re.compile('article|body|content|entry|hentry|main|page|pagination|post|text|blog|story',re.I),
'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),
'divToPElementsRe': re.compile('<(a|blockquote|dl|div|img|ol|p|pre|table|ul)',re.I),
#'replaceBrsRe': re.compile('(<br[^>]*>[ \n\r\t]*){2,}',re.I),
#'replaceFontsRe': re.compile('<(\/?)font[^>]*>',re.I),
#'trimRe': re.compile('^\s+|\s+$/'),
#'normalizeRe': re.compile('\s{2,}/'),
#'killBreaksRe': re.compile('(<br\s*\/?>(\s|&nbsp;?)*){1,}/'),
#'videoRe': re.compile('http:\/\/(www\.)?(youtube|vimeo)\.com', re.I),
#skipFootnoteLink: /^\s*(\[?[a-z0-9]{1,2}\]?|^|edit|citation needed)\s*$/i,
}
def describe(node, depth=1):
if not hasattr(node, 'tag'):
return "[%s]" % type(node)
name = node.tag
if node.get('id', ''): name += '#'+node.get('id')
if node.get('class', ''):
name += '.' + node.get('class').replace(' ','.')
if name[:4] in ['div#', 'div.']:
name = name[3:]
if depth and node.getparent() is not None:
return name+' - '+describe(node.getparent(), depth-1)
return name
def to_int(x):
if not x: return None
x = x.strip()
if x.endswith('px'):
return int(x[:-2])
if x.endswith('em'):
return int(x[:-2]) * 12
return int(x)
def clean(text):
text = re.sub('\s*\n\s*', '\n', text)
text = re.sub('[ \t]{2,}', ' ', text)
return text.strip()
def text_length(i):
return len(clean(i.text_content() or ""))
class Unparseable(ValueError):
pass
class Summary:
'''
The type of object returned by Document.summary(). This includes the
confidence level we have in our summary. If this is low (<35), our summary
may not be valid, though we did our best.
'''
def __init__(self, confidence, html):
self.confidence = confidence
self.html = html
class Document:
TEXT_LENGTH_THRESHOLD = 25
RETRY_LENGTH = 250
def __init__(self, input, **options):
self.input = input
self.options = defaultdict(lambda: None)
for k, v in options.items():
self.options[k] = v
self.html = None
def _html(self, force=False):
if force or self.html is None:
self.html = self._parse(self.input)
return self.html
def _parse(self, input):
doc = build_doc(input)
doc = html_cleaner.clean_html(doc)
base_href = self.options['url']
if base_href:
doc.make_links_absolute(base_href, resolve_base_href=True)
else:
doc.resolve_base_href()
return doc
def content(self):
return get_body(self._html(True))
def title(self):
return get_title(self._html(True))
def short_title(self):
return shorten_title(self._html(True))
def summary(self):
try:
ruthless = True
while True:
self._html(True)
for i in self.tags(self.html, 'script', 'style'):
i.drop_tree()
for i in self.tags(self.html, 'body'):
i.set('id', 'readabilityBody')
if ruthless:
self.remove_unlikely_candidates()
self.transform_misused_divs_into_paragraphs()
candidates = self.score_paragraphs()
best_candidate = self.select_best_candidate(candidates)
if best_candidate:
confidence = best_candidate['content_score']
article = self.get_article(candidates, best_candidate)
else:
if ruthless:
logging.debug("ruthless removal did not work. ")
ruthless = False
self.debug("ended up stripping too much - going for a safer _parse")
# try again
continue
else:
logging.debug("Ruthless and lenient parsing did not work. Returning raw html")
confidence = 0;
article = self.html.find('body') or self.html
unicode_cleaned_article = self.sanitize(article, candidates)
cleaned_doc = fragment_fromstring(unicode_cleaned_article)
cleaned_article = tostring(cleaned_doc)
of_acceptable_length = len(cleaned_article or '') >= (self.options['retry_length'] or self.RETRY_LENGTH)
if ruthless and not of_acceptable_length:
ruthless = False
continue # try again
else:
return Summary(confidence, cleaned_article)
except StandardError, e:
#logging.exception('error getting summary: ' + str(traceback.format_exception(*sys.exc_info())))
logging.exception('error getting summary: ' )
raise Unparseable(str(e)), None, sys.exc_info()[2]
def get_article(self, candidates, best_candidate):
# Now that we have the top candidate, look through its siblings for content that might also be related.
# Things like preambles, content split by ads that we removed, etc.
sibling_score_threshold = max([10, best_candidate['content_score'] * 0.2])
article = B.DIV()
article.attrib['id'] = 'article'
best_elem = best_candidate['elem']
for sibling in best_elem.getparent().getchildren():
#if isinstance(sibling, NavigableString): continue#in lxml there no concept of simple text
append = False
if sibling is best_elem:
append = True
sibling_key = sibling #HashableElement(sibling)
if sibling_key in candidates and candidates[sibling_key]['content_score'] >= sibling_score_threshold:
append = True
if sibling.tag == "p":
link_density = self.get_link_density(sibling)
node_content = sibling.text or ""
node_length = len(node_content)
if node_length > 80 and link_density < 0.25:
append = True
elif node_length < 80 and link_density == 0 and re.search('\.( |$)', node_content):
append = True
if append:
article.append(sibling)
#if article is not None:
# article.append(best_elem)
return article
def select_best_candidate(self, candidates):
sorted_candidates = sorted(candidates.values(), key=lambda x: x['content_score'], reverse=True)
for candidate in sorted_candidates[:5]:
elem = candidate['elem']
self.debug("Top 5 : %6.3f %s" % (candidate['content_score'], describe(elem)))
if len(sorted_candidates) == 0:
return None
best_candidate = sorted_candidates[0]
return best_candidate
def get_link_density(self, elem):
link_length = 0
for i in elem.findall(".//a"):
link_length += text_length(i)
#if len(elem.findall(".//div") or elem.findall(".//p")):
# link_length = link_length
total_length = text_length(elem)
return float(link_length) / max(total_length, 1)
def score_paragraphs(self, ):
MIN_LEN = self.options.get('min_text_length', self.TEXT_LENGTH_THRESHOLD)
candidates = {}
#self.debug(str([describe(node) for node in self.tags(self.html, "div")]))
ordered = []
for elem in self.tags(self.html, "p", "pre", "td"):
parent_node = elem.getparent()
if parent_node is None:
continue
grand_parent_node = parent_node.getparent()
inner_text = clean(elem.text_content() or "")
inner_text_len = len(inner_text)
# If this paragraph is less than 25 characters, don't even count it.
if inner_text_len < MIN_LEN:
continue
if parent_node not in candidates:
candidates[parent_node] = self.score_node(parent_node)
ordered.append(parent_node)
if grand_parent_node is not None and grand_parent_node not in candidates:
candidates[grand_parent_node] = self.score_node(grand_parent_node)
ordered.append(grand_parent_node)
content_score = 1
content_score += len(inner_text.split(','))
content_score += min((inner_text_len / 100), 3)
#if elem not in candidates:
# candidates[elem] = self.score_node(elem)
#WTF? candidates[elem]['content_score'] += content_score
candidates[parent_node]['content_score'] += content_score
if grand_parent_node is not None:
candidates[grand_parent_node]['content_score'] += content_score / 2.0
# Scale the final candidates score based on link density. Good content should have a
# relatively small link density (5% or less) and be mostly unaffected by this operation.
for elem in ordered:
candidate = candidates[elem]
ld = self.get_link_density(elem)
score = candidate['content_score']
self.debug("Candid: %6.3f %s link density %.3f -> %6.3f" % (score, describe(elem), ld, score*(1-ld)))
candidate['content_score'] *= (1 - ld)
return candidates
def class_weight(self, e):
weight = 0
if e.get('class', None):
if REGEXES['negativeRe'].search(e.get('class')):
weight -= 25
if REGEXES['positiveRe'].search(e.get('class')):
weight += 25
if e.get('id', None):
if REGEXES['negativeRe'].search(e.get('id')):
weight -= 25
if REGEXES['positiveRe'].search(e.get('id')):
weight += 25
return weight
def score_node(self, elem):
content_score = self.class_weight(elem)
name = elem.tag.lower()
if name == "div":
content_score += 5
elif name in ["pre", "td", "blockquote"]:
content_score += 3
elif name in ["address", "ol", "ul", "dl", "dd", "dt", "li", "form"]:
content_score -= 3
elif name in ["h1", "h2", "h3", "h4", "h5", "h6", "th"]:
content_score -= 5
return {
'content_score': content_score,
'elem': elem
}
def debug(self, *a):
#if self.options['debug']:
logging.debug(*a)
def remove_unlikely_candidates(self):
for elem in self.html.iter():
s = "%s %s" % (elem.get('class', ''), elem.get('id', ''))
#self.debug(s)
if (REGEXES['unlikelyCandidatesRe'].search(s) and
(not REGEXES['okMaybeItsACandidateRe'].search(s)) and
elem.tag != 'body' and
elem.getparent() is not None
):
self.debug("Removing unlikely candidate - %s" % describe(elem))
elem.drop_tree()
def transform_misused_divs_into_paragraphs(self):
for elem in self.tags(self.html, 'div'):
# transform <div>s that do not contain other block elements into <p>s
if not REGEXES['divToPElementsRe'].search(unicode(''.join(map(tostring, list(elem))))):
#self.debug("Altering %s to p" % (describe(elem)))
elem.tag = "p"
#print "Fixed element "+describe(elem)
for elem in self.tags(self.html, 'div'):
if elem.text and elem.text.strip():
p = fragment_fromstring('<p/>')
p.text = elem.text
elem.text = None
elem.insert(0, p)
#print "Appended "+tounicode(p)+" to "+describe(elem)
for pos, child in reversed(list(enumerate(elem))):
if child.tail and child.tail.strip():
p = fragment_fromstring('<p/>')
p.text = child.tail
child.tail = None
elem.insert(pos + 1, p)
#print "Inserted "+tounicode(p)+" to "+describe(elem)
if child.tag == 'br':
#print 'Dropped <br> at '+describe(elem)
child.drop_tree()
def tags(self, node, *tag_names):
for tag_name in tag_names:
for e in node.findall('.//%s' % tag_name):
yield e
def reverse_tags(self, node, *tag_names):
for tag_name in tag_names:
for e in reversed(node.findall('.//%s' % tag_name)):
yield e
def sanitize(self, node, candidates):
MIN_LEN = self.options.get('min_text_length', self.TEXT_LENGTH_THRESHOLD)
for header in self.tags(node, "h1", "h2", "h3", "h4", "h5", "h6"):
if self.class_weight(header) < 0 or self.get_link_density(header) > 0.33:
header.drop_tree()
for elem in self.tags(node, "form", "iframe", "textarea"):
elem.drop_tree()
allowed = {}
# Conditionally clean <table>s, <ul>s, and <div>s
for el in self.reverse_tags(node, "table", "ul", "div"):
if el in allowed:
continue
weight = self.class_weight(el)
if el in candidates:
content_score = candidates[el]['content_score']
#print '!',el, '-> %6.3f' % content_score
else:
content_score = 0
tag = el.tag
if weight + content_score < 0:
self.debug("Cleaned %s with score %6.3f and weight %-3s" %
(describe(el), content_score, weight, ))
el.drop_tree()
elif el.text_content().count(",") < 10:
counts = {}
for kind in ['p', 'img', 'li', 'a', 'embed', 'input']:
counts[kind] = len(el.findall('.//%s' %kind))
counts["li"] -= 100
content_length = text_length(el) # Count the text length excluding any surrounding whitespace
link_density = self.get_link_density(el)
parent_node = el.getparent()
if parent_node is not None:
if parent_node in candidates:
content_score = candidates[parent_node]['content_score']
else:
content_score = 0
#if parent_node is not None:
#pweight = self.class_weight(parent_node) + content_score
#pname = describe(parent_node)
#else:
#pweight = 0
#pname = "no parent"
to_remove = False
reason = ""
#if el.tag == 'div' and counts["img"] >= 1:
# continue
if counts["p"] and counts["img"] > counts["p"]:
reason = "too many images (%s)" % counts["img"]
to_remove = True
elif counts["li"] > counts["p"] and tag != "ul" and tag != "ol":
reason = "more <li>s than <p>s"
to_remove = True
elif counts["input"] > (counts["p"] / 3):
reason = "less than 3x <p>s than <input>s"
to_remove = True
elif content_length < (MIN_LEN) and (counts["img"] == 0 or counts["img"] > 2):
reason = "too short content length %s without a single image" % 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
# 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
self.debug("Allowing %s" % describe(el))
for desnode in self.tags(el, "table", "ul", "div"):
allowed[desnode] = True
if to_remove:
self.debug("Cleaned %6.3f %s with weight %s cause it has %s." %
(content_score, describe(el), weight, reason))
#print tounicode(el)
#self.debug("pname %s pweight %.3f" %(pname, pweight))
el.drop_tree()
for el in ([node] + [n for n in node.iter()]):
if not (self.options['attributes']):
#el.attrib = {} #FIXME:Checkout the effects of disabling this
pass
return clean_attributes(tounicode(node))
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)
def main():
from optparse import OptionParser
parser = OptionParser(usage="%prog: [options] [file]")
parser.add_option('-v', '--verbose', action='store_true')
parser.add_option('-u', '--url', help="use URL instead of a local file")
(options, args) = parser.parse_args()
if not (len(args) == 1 or options.url):
parser.print_help()
sys.exit(1)
logging.basicConfig(level=logging.INFO)
file = None
if options.url:
import urllib
file = urllib.urlopen(options.url)
else:
file = open(args[0])
try:
print Document(file.read(), debug=options.verbose).summary().encode('ascii','ignore')
finally:
file.close()
if __name__ == '__main__':
main()

@ -1,7 +1,7 @@
#!/usr/bin/env python
from setuptools import setup, find_packages
version = "0.2.5"
version = "0.3.0"
install_requires = [
"chardet",
"lxml",
@ -41,5 +41,4 @@ setup(
'console_scripts':
['readability=readability_lxml:client.main']
},
)

@ -0,0 +1 @@
from .readability import Document

@ -0,0 +1,261 @@
import lxml.html
import lxml.html.diff
import os
import os.path
import readability
import sys
import unittest
import yaml
from lxml.html import builder as B
ORIGINAL_SUFFIX = '-orig.html'
READABLE_SUFFIX = '-rdbl.html'
RESULT_SUFFIX = '-result.html'
TEST_DATA_PATH = 'test_data'
TEST_OUTPUT_PATH = 'test_output'
class ReadabilityTest:
def __init__(self, dir_path, name, orig_path, rdbl_path):
self.dir_path = dir_path
self.name = name
self.orig_path = orig_path
self.rdbl_path = rdbl_path
class ReadabilityTestData:
def __init__(self, test, orig_html, rdbl_html):
self.test = test
self.orig_html = orig_html
self.rdbl_html = rdbl_html
class ReadabilityTestResult:
def __init__(self, test_data, result_html, diff_html):
self.test_data = test_data
self.result_html = result_html
self.diff_html = diff_html
def strip_with_suffix(suffix, files):
filtered = [x for x in files if x.endswith(suffix)]
stripped = [x.replace(suffix, '') for x in filtered]
return set(stripped)
def check_missing(lhs, rhs, rhs_description):
only_lhs = lhs.difference(rhs)
if len(only_lhs) != 0:
is_are = 'is' if len(only_lhs) == 1 else 'are'
file_files = 'file' if len(only_lhs) == 1 else 'files'
s = ('(%s) %s missing %s %s' %
(', '.join(only_lhs), is_are, rhs_description, file_files)
)
raise Exception(s)
def resolve_test_names(files):
orig_names = strip_with_suffix(ORIGINAL_SUFFIX, files)
rdbl_names = strip_with_suffix(READABLE_SUFFIX, files)
check_missing(orig_names, rdbl_names, READABLE_SUFFIX)
check_missing(rdbl_names, orig_names, ORIGINAL_SUFFIX)
return orig_names
def make_path(dir_path, name, suffix):
return os.path.join(dir_path, ''.join([name, suffix]))
def make_readability_test(dir_path, name):
return ReadabilityTest(
dir_path,
name,
make_path(dir_path, name, ORIGINAL_SUFFIX),
make_path(dir_path, name, READABLE_SUFFIX)
)
def load_test_data(test):
orig = open(test.orig_path, 'r').read()
rdbl = open(test.rdbl_path, 'r').read()
return ReadabilityTestData(test, orig, rdbl)
def load_readability_tests(dir_path, files):
names = resolve_test_names(files)
return [make_readability_test(dir_path, name) for name in names]
def execute_test(test_data):
doc = readability.Document(test_data.orig_html)
summary = doc.summary()
benchmark_doc = (test_data.rdbl_html, 'benchmark')
result_doc = (summary.html, 'result')
# diff = lxml.html.diff.html_annotate([benchmark_doc, result_doc])
diff = lxml.html.diff.htmldiff(test_data.rdbl_html, summary.html)
# diff = test_data.orig_html
return ReadabilityTestResult(test_data, summary.html, diff)
DIFF_CSS = '''
#article {
margin: 0 auto;
max-width: 705px;
min-width: 225px;
font-family: Georgia, 'Times New Roman', serif;
font-size: 19px;
line-height: 29px;
}
#article p {
font-size: 19px;
line-height: 29px;
margin: 19px 0px 19px 0px;
}
ins {
background-color: #C6F7C3;
text-decoration: none;
}
ins img {
border-width: 3px;
border-style: dotted;
border-color: #51B548;
}
del {
background-color: #F7C3C3;
text-decoration: none;
}
del img {
border-width: 3px;
border-style: dotted;
border-color: #D12626;
}
'''
def add_diff_css(doc):
style = B.STYLE(DIFF_CSS, type = 'text/css')
head = B.HEAD(style)
doc.insert(0, head)
def write_result(output_dir_path, result):
doc = lxml.html.document_fromstring(result.diff_html)
add_diff_css(doc)
output_file = ''.join([result.test_data.test.name, RESULT_SUFFIX])
output_path = os.path.join(output_dir_path, output_file)
with open(output_path, 'w') as f:
f.write(lxml.html.tostring(doc))
def run_readability_tests():
files = os.listdir(TEST_DATA_PATH)
tests = load_readability_tests(TEST_DATA_PATH, files)
for test in tests:
test_data = load_test_data(test)
result = execute_test(test_data)
write_result(TEST_OUTPUT_PATH, result)
class TestStripWithSuffix(unittest.TestCase):
def test_no_files(self):
expected = set()
actual = strip_with_suffix('.test', [])
self.assertEqual(expected, actual)
def test_files(self):
expected = {'foo', 'bar'}
actual = strip_with_suffix('.test', ['foo.test', 'bar.test'])
self.assertEqual(expected, actual)
def test_extra_files(self):
expected = {'foo', 'bar'}
actual = strip_with_suffix('.test', ['foo.test', 'bar.test', 'extra'])
self.assertEqual(expected, actual)
class TestResolveTestNames(unittest.TestCase):
def test_no_files(self):
expected = set()
actual = resolve_test_names([])
self.assertEqual(expected, actual)
def test_files(self):
expected = {'foo', 'bar'}
files = [
'foo-orig.html',
'foo-rdbl.html',
'bar-orig.html',
'bar-rdbl.html'
]
actual = resolve_test_names(files)
self.assertEqual(expected, actual)
def test_missing_rdbl(self):
files = [
'foo-orig.html',
'foo-rdbl.html',
'bar-orig.html'
]
with self.assertRaisesRegexp(
Exception,
r'\(bar\) is missing -rdbl.html file'
):
resolve_test_names(files)
def test_missing_multiple_rdbl(self):
files = [
'foo-orig.html',
'bar-orig.html'
]
with self.assertRaisesRegexp(
Exception,
r'\(foo, bar\) are missing -rdbl.html files'
):
resolve_test_names(files)
def test_missing_orig(self):
files = [
'foo-orig.html',
'foo-rdbl.html',
'bar-rdbl.html'
]
with self.assertRaisesRegexp(
Exception,
r'\(bar\) is missing -orig.html file'
):
resolve_test_names(files)
def test_missing_multiple_orig(self):
files = [
'foo-rdbl.html',
'bar-rdbl.html'
]
with self.assertRaisesRegexp(
Exception,
r'\(foo, bar\) are missing -orig.html files'
):
resolve_test_names(files)
def main():
if len(sys.argv) > 1 and sys.argv[1] == 'unittest':
del sys.argv[1]
return unittest.main()
run_readability_tests()
if __name__ == '__main__':
main()

@ -0,0 +1,2 @@
*
!.gitignore
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