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475 lines
24 KiB
Python
475 lines
24 KiB
Python
import re
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import unittest
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import pytest
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from scrapy.http import HtmlResponse, XmlResponse
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from scrapy.link import Link
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from scrapy.linkextractors.lxmlhtml import LxmlLinkExtractor
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from tests import get_testdata
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# a hack to skip base class tests in pytest
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class Base:
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class LinkExtractorTestCase(unittest.TestCase):
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extractor_cls = None
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escapes_whitespace = False
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def setUp(self):
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body = get_testdata('link_extractor', 'sgml_linkextractor.html')
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self.response = HtmlResponse(url='http://example.com/index', body=body)
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def test_urls_type(self):
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''' Test that the resulting urls are str objects '''
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lx = self.extractor_cls()
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self.assertTrue(all(isinstance(link.url, str)
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for link in lx.extract_links(self.response)))
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def test_extract_all_links(self):
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lx = self.extractor_cls()
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if self.escapes_whitespace:
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page4_url = 'http://example.com/page%204.html'
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else:
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page4_url = 'http://example.com/page 4.html'
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self.assertEqual([link for link in lx.extract_links(self.response)], [
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Link(url='http://example.com/sample1.html', text=u''),
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Link(url='http://example.com/sample2.html', text=u'sample 2'),
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Link(url='http://example.com/sample3.html', text=u'sample 3 text'),
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Link(url='http://example.com/sample3.html#foo', text='sample 3 repetition with fragment'),
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Link(url='http://www.google.com/something', text=u''),
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Link(url='http://example.com/innertag.html', text=u'inner tag'),
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Link(url=page4_url, text=u'href with whitespaces'),
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])
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def test_extract_filter_allow(self):
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lx = self.extractor_cls(allow=('sample', ))
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self.assertEqual([link for link in lx.extract_links(self.response)], [
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Link(url='http://example.com/sample1.html', text=u''),
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Link(url='http://example.com/sample2.html', text=u'sample 2'),
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Link(url='http://example.com/sample3.html', text=u'sample 3 text'),
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Link(url='http://example.com/sample3.html#foo', text='sample 3 repetition with fragment')
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])
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def test_extract_filter_allow_with_duplicates(self):
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lx = self.extractor_cls(allow=('sample', ), unique=False)
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self.assertEqual([link for link in lx.extract_links(self.response)], [
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Link(url='http://example.com/sample1.html', text=u''),
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Link(url='http://example.com/sample2.html', text=u'sample 2'),
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Link(url='http://example.com/sample3.html', text=u'sample 3 text'),
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Link(url='http://example.com/sample3.html', text=u'sample 3 repetition'),
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Link(url='http://example.com/sample3.html#foo', text='sample 3 repetition with fragment')
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])
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def test_extract_filter_allow_with_duplicates_canonicalize(self):
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lx = self.extractor_cls(allow=('sample', ), unique=False,
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canonicalize=True)
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self.assertEqual([link for link in lx.extract_links(self.response)], [
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Link(url='http://example.com/sample1.html', text=u''),
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Link(url='http://example.com/sample2.html', text=u'sample 2'),
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Link(url='http://example.com/sample3.html', text=u'sample 3 text'),
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Link(url='http://example.com/sample3.html', text=u'sample 3 repetition'),
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Link(url='http://example.com/sample3.html', text='sample 3 repetition with fragment')
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])
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def test_extract_filter_allow_no_duplicates_canonicalize(self):
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lx = self.extractor_cls(allow=('sample',), unique=True,
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canonicalize=True)
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self.assertEqual([link for link in lx.extract_links(self.response)], [
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Link(url='http://example.com/sample1.html', text=u''),
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Link(url='http://example.com/sample2.html', text=u'sample 2'),
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Link(url='http://example.com/sample3.html', text=u'sample 3 text'),
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])
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def test_extract_filter_allow_and_deny(self):
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lx = self.extractor_cls(allow=('sample', ), deny=('3', ))
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self.assertEqual([link for link in lx.extract_links(self.response)], [
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Link(url='http://example.com/sample1.html', text=u''),
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Link(url='http://example.com/sample2.html', text=u'sample 2'),
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])
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def test_extract_filter_allowed_domains(self):
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lx = self.extractor_cls(allow_domains=('google.com', ))
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self.assertEqual([link for link in lx.extract_links(self.response)], [
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Link(url='http://www.google.com/something', text=u''),
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])
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def test_extraction_using_single_values(self):
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'''Test the extractor's behaviour among different situations'''
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lx = self.extractor_cls(allow='sample')
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self.assertEqual([link for link in lx.extract_links(self.response)], [
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Link(url='http://example.com/sample1.html', text=u''),
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Link(url='http://example.com/sample2.html', text=u'sample 2'),
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Link(url='http://example.com/sample3.html', text=u'sample 3 text'),
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Link(url='http://example.com/sample3.html#foo',
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text='sample 3 repetition with fragment')
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])
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lx = self.extractor_cls(allow='sample', deny='3')
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self.assertEqual([link for link in lx.extract_links(self.response)], [
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Link(url='http://example.com/sample1.html', text=u''),
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Link(url='http://example.com/sample2.html', text=u'sample 2'),
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])
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lx = self.extractor_cls(allow_domains='google.com')
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self.assertEqual([link for link in lx.extract_links(self.response)], [
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Link(url='http://www.google.com/something', text=u''),
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])
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lx = self.extractor_cls(deny_domains='example.com')
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self.assertEqual([link for link in lx.extract_links(self.response)], [
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Link(url='http://www.google.com/something', text=u''),
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])
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def test_nofollow(self):
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'''Test the extractor's behaviour for links with rel="nofollow"'''
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html = b"""<html><head><title>Page title<title>
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<body>
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<div class='links'>
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<p><a href="/about.html">About us</a></p>
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</div>
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<div>
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<p><a href="/follow.html">Follow this link</a></p>
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</div>
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<div>
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<p><a href="/nofollow.html" rel="nofollow">Dont follow this one</a></p>
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</div>
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<div>
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<p><a href="/nofollow2.html" rel="blah">Choose to follow or not</a></p>
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</div>
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<div>
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<p><a href="http://google.com/something" rel="external nofollow">External link not to follow</a></p>
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</div>
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</body></html>"""
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response = HtmlResponse("http://example.org/somepage/index.html", body=html)
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lx = self.extractor_cls()
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self.assertEqual(lx.extract_links(response), [
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Link(url='http://example.org/about.html', text=u'About us'),
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Link(url='http://example.org/follow.html', text=u'Follow this link'),
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Link(url='http://example.org/nofollow.html', text=u'Dont follow this one', nofollow=True),
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Link(url='http://example.org/nofollow2.html', text=u'Choose to follow or not'),
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Link(url='http://google.com/something', text=u'External link not to follow', nofollow=True),
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])
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def test_matches(self):
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url1 = 'http://lotsofstuff.com/stuff1/index'
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url2 = 'http://evenmorestuff.com/uglystuff/index'
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lx = self.extractor_cls(allow=(r'stuff1', ))
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self.assertEqual(lx.matches(url1), True)
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self.assertEqual(lx.matches(url2), False)
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lx = self.extractor_cls(deny=(r'uglystuff', ))
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self.assertEqual(lx.matches(url1), True)
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self.assertEqual(lx.matches(url2), False)
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lx = self.extractor_cls(allow_domains=('evenmorestuff.com', ))
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self.assertEqual(lx.matches(url1), False)
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self.assertEqual(lx.matches(url2), True)
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lx = self.extractor_cls(deny_domains=('lotsofstuff.com', ))
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self.assertEqual(lx.matches(url1), False)
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self.assertEqual(lx.matches(url2), True)
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lx = self.extractor_cls(allow=('blah1',), deny=('blah2',),
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allow_domains=('blah1.com',),
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deny_domains=('blah2.com',))
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self.assertEqual(lx.matches('http://blah1.com/blah1'), True)
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self.assertEqual(lx.matches('http://blah1.com/blah2'), False)
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self.assertEqual(lx.matches('http://blah2.com/blah1'), False)
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self.assertEqual(lx.matches('http://blah2.com/blah2'), False)
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def test_restrict_xpaths(self):
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lx = self.extractor_cls(restrict_xpaths=('//div[@id="subwrapper"]', ))
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self.assertEqual([link for link in lx.extract_links(self.response)], [
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Link(url='http://example.com/sample1.html', text=u''),
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Link(url='http://example.com/sample2.html', text=u'sample 2'),
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])
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def test_restrict_xpaths_encoding(self):
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"""Test restrict_xpaths with encodings"""
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html = b"""<html><head><title>Page title<title>
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<body><p><a href="item/12.html">Item 12</a></p>
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<div class='links'>
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<p><a href="/about.html">About us\xa3</a></p>
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</div>
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<div>
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<p><a href="/nofollow.html">This shouldn't be followed</a></p>
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</div>
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</body></html>"""
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response = HtmlResponse("http://example.org/somepage/index.html", body=html, encoding='windows-1252')
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lx = self.extractor_cls(restrict_xpaths="//div[@class='links']")
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self.assertEqual(lx.extract_links(response),
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[Link(url='http://example.org/about.html', text=u'About us\xa3')])
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def test_restrict_xpaths_with_html_entities(self):
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html = b'<html><body><p><a href="/♥/you?c=€">text</a></p></body></html>'
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response = HtmlResponse("http://example.org/somepage/index.html", body=html, encoding='iso8859-15')
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links = self.extractor_cls(restrict_xpaths='//p').extract_links(response)
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self.assertEqual(links,
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[Link(url='http://example.org/%E2%99%A5/you?c=%E2%82%AC', text=u'text')])
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def test_restrict_xpaths_concat_in_handle_data(self):
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"""html entities cause SGMLParser to call handle_data hook twice"""
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body = b"""<html><body><div><a href="/foo">>\xbe\xa9<\xb6\xab</a></body></html>"""
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response = HtmlResponse("http://example.org", body=body, encoding='gb18030')
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lx = self.extractor_cls(restrict_xpaths="//div")
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self.assertEqual(lx.extract_links(response),
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[Link(url='http://example.org/foo', text=u'>\u4eac<\u4e1c',
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fragment='', nofollow=False)])
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def test_restrict_css(self):
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lx = self.extractor_cls(restrict_css=('#subwrapper a',))
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self.assertEqual(lx.extract_links(self.response), [
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Link(url='http://example.com/sample2.html', text=u'sample 2')
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])
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def test_restrict_css_and_restrict_xpaths_together(self):
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lx = self.extractor_cls(restrict_xpaths=('//div[@id="subwrapper"]', ),
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restrict_css=('#subwrapper + a', ))
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self.assertEqual([link for link in lx.extract_links(self.response)], [
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Link(url='http://example.com/sample1.html', text=u''),
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Link(url='http://example.com/sample2.html', text=u'sample 2'),
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Link(url='http://example.com/sample3.html', text=u'sample 3 text'),
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])
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def test_area_tag_with_unicode_present(self):
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body = b"""<html><body>\xbe\xa9<map><area href="http://example.org/foo" /></map></body></html>"""
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response = HtmlResponse("http://example.org", body=body, encoding='utf-8')
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lx = self.extractor_cls()
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lx.extract_links(response)
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lx.extract_links(response)
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lx.extract_links(response)
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self.assertEqual(lx.extract_links(response),
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[Link(url='http://example.org/foo', text=u'',
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fragment='', nofollow=False)])
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def test_encoded_url(self):
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body = b"""<html><body><div><a href="?page=2">BinB</a></body></html>"""
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response = HtmlResponse("http://known.fm/AC%2FDC/", body=body, encoding='utf8')
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lx = self.extractor_cls()
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self.assertEqual(lx.extract_links(response), [
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Link(url='http://known.fm/AC%2FDC/?page=2', text=u'BinB', fragment='', nofollow=False),
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])
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def test_encoded_url_in_restricted_xpath(self):
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body = b"""<html><body><div><a href="?page=2">BinB</a></body></html>"""
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response = HtmlResponse("http://known.fm/AC%2FDC/", body=body, encoding='utf8')
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lx = self.extractor_cls(restrict_xpaths="//div")
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self.assertEqual(lx.extract_links(response), [
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Link(url='http://known.fm/AC%2FDC/?page=2', text=u'BinB', fragment='', nofollow=False),
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])
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def test_ignored_extensions(self):
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# jpg is ignored by default
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html = b"""<a href="page.html">asd</a> and <a href="photo.jpg">"""
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response = HtmlResponse("http://example.org/", body=html)
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lx = self.extractor_cls()
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self.assertEqual(lx.extract_links(response), [
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Link(url='http://example.org/page.html', text=u'asd'),
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])
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# override denied extensions
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lx = self.extractor_cls(deny_extensions=['html'])
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self.assertEqual(lx.extract_links(response), [
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Link(url='http://example.org/photo.jpg'),
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])
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def test_process_value(self):
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"""Test restrict_xpaths with encodings"""
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html = b"""
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<a href="javascript:goToPage('../other/page.html','photo','width=600,height=540,scrollbars'); return false">Link text</a>
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<a href="/about.html">About us</a>
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"""
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response = HtmlResponse("http://example.org/somepage/index.html", body=html, encoding='windows-1252')
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def process_value(value):
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m = re.search("javascript:goToPage\('(.*?)'", value)
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if m:
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return m.group(1)
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lx = self.extractor_cls(process_value=process_value)
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self.assertEqual(lx.extract_links(response),
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[Link(url='http://example.org/other/page.html', text='Link text')])
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def test_base_url_with_restrict_xpaths(self):
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html = b"""<html><head><title>Page title<title><base href="http://otherdomain.com/base/" />
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<body><p><a href="item/12.html">Item 12</a></p>
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</body></html>"""
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response = HtmlResponse("http://example.org/somepage/index.html", body=html)
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lx = self.extractor_cls(restrict_xpaths="//p")
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self.assertEqual(lx.extract_links(response),
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[Link(url='http://otherdomain.com/base/item/12.html', text='Item 12')])
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def test_attrs(self):
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lx = self.extractor_cls(attrs="href")
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if self.escapes_whitespace:
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page4_url = 'http://example.com/page%204.html'
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else:
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page4_url = 'http://example.com/page 4.html'
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self.assertEqual(lx.extract_links(self.response), [
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Link(url='http://example.com/sample1.html', text=u''),
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Link(url='http://example.com/sample2.html', text=u'sample 2'),
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Link(url='http://example.com/sample3.html', text=u'sample 3 text'),
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Link(url='http://example.com/sample3.html#foo', text='sample 3 repetition with fragment'),
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Link(url='http://www.google.com/something', text=u''),
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Link(url='http://example.com/innertag.html', text=u'inner tag'),
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Link(url=page4_url, text=u'href with whitespaces'),
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])
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lx = self.extractor_cls(attrs=("href","src"), tags=("a","area","img"), deny_extensions=())
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self.assertEqual(lx.extract_links(self.response), [
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Link(url='http://example.com/sample1.html', text=u''),
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Link(url='http://example.com/sample2.html', text=u'sample 2'),
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Link(url='http://example.com/sample2.jpg', text=u''),
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Link(url='http://example.com/sample3.html', text=u'sample 3 text'),
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Link(url='http://example.com/sample3.html#foo', text='sample 3 repetition with fragment'),
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Link(url='http://www.google.com/something', text=u''),
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Link(url='http://example.com/innertag.html', text=u'inner tag'),
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Link(url=page4_url, text=u'href with whitespaces'),
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])
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lx = self.extractor_cls(attrs=None)
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self.assertEqual(lx.extract_links(self.response), [])
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def test_tags(self):
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html = b"""<html><area href="sample1.html"></area><a href="sample2.html">sample 2</a><img src="sample2.jpg"/></html>"""
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response = HtmlResponse("http://example.com/index.html", body=html)
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lx = self.extractor_cls(tags=None)
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self.assertEqual(lx.extract_links(response), [])
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lx = self.extractor_cls()
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self.assertEqual(lx.extract_links(response), [
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Link(url='http://example.com/sample1.html', text=u''),
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Link(url='http://example.com/sample2.html', text=u'sample 2'),
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])
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lx = self.extractor_cls(tags="area")
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self.assertEqual(lx.extract_links(response), [
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Link(url='http://example.com/sample1.html', text=u''),
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])
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lx = self.extractor_cls(tags="a")
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self.assertEqual(lx.extract_links(response), [
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Link(url='http://example.com/sample2.html', text=u'sample 2'),
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])
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lx = self.extractor_cls(tags=("a","img"), attrs=("href", "src"), deny_extensions=())
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self.assertEqual(lx.extract_links(response), [
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Link(url='http://example.com/sample2.html', text=u'sample 2'),
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Link(url='http://example.com/sample2.jpg', text=u''),
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])
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def test_tags_attrs(self):
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html = b"""
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<html><body>
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<div id="item1" data-url="get?id=1"><a href="#">Item 1</a></div>
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<div id="item2" data-url="get?id=2"><a href="#">Item 2</a></div>
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</body></html>
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"""
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response = HtmlResponse("http://example.com/index.html", body=html)
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lx = self.extractor_cls(tags='div', attrs='data-url')
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self.assertEqual(lx.extract_links(response), [
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Link(url='http://example.com/get?id=1', text=u'Item 1', fragment='', nofollow=False),
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Link(url='http://example.com/get?id=2', text=u'Item 2', fragment='', nofollow=False)
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])
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lx = self.extractor_cls(tags=('div',), attrs=('data-url',))
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self.assertEqual(lx.extract_links(response), [
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Link(url='http://example.com/get?id=1', text=u'Item 1', fragment='', nofollow=False),
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Link(url='http://example.com/get?id=2', text=u'Item 2', fragment='', nofollow=False)
|
|
])
|
|
|
|
def test_xhtml(self):
|
|
xhtml = b"""
|
|
<?xml version="1.0"?>
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
|
|
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
|
|
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
|
|
<head>
|
|
<title>XHTML document title</title>
|
|
</head>
|
|
<body>
|
|
<div class='links'>
|
|
<p><a href="/about.html">About us</a></p>
|
|
</div>
|
|
<div>
|
|
<p><a href="/follow.html">Follow this link</a></p>
|
|
</div>
|
|
<div>
|
|
<p><a href="/nofollow.html" rel="nofollow">Dont follow this one</a></p>
|
|
</div>
|
|
<div>
|
|
<p><a href="/nofollow2.html" rel="blah">Choose to follow or not</a></p>
|
|
</div>
|
|
<div>
|
|
<p><a href="http://google.com/something" rel="external nofollow">External link not to follow</a></p>
|
|
</div>
|
|
</body>
|
|
</html>
|
|
"""
|
|
|
|
response = HtmlResponse("http://example.com/index.xhtml", body=xhtml)
|
|
|
|
lx = self.extractor_cls()
|
|
self.assertEqual(lx.extract_links(response),
|
|
[Link(url='http://example.com/about.html', text=u'About us', fragment='', nofollow=False),
|
|
Link(url='http://example.com/follow.html', text=u'Follow this link', fragment='', nofollow=False),
|
|
Link(url='http://example.com/nofollow.html', text=u'Dont follow this one', fragment='', nofollow=True),
|
|
Link(url='http://example.com/nofollow2.html', text=u'Choose to follow or not', fragment='', nofollow=False),
|
|
Link(url='http://google.com/something', text=u'External link not to follow', nofollow=True)]
|
|
)
|
|
|
|
response = XmlResponse("http://example.com/index.xhtml", body=xhtml)
|
|
|
|
lx = self.extractor_cls()
|
|
self.assertEqual(lx.extract_links(response),
|
|
[Link(url='http://example.com/about.html', text=u'About us', fragment='', nofollow=False),
|
|
Link(url='http://example.com/follow.html', text=u'Follow this link', fragment='', nofollow=False),
|
|
Link(url='http://example.com/nofollow.html', text=u'Dont follow this one', fragment='', nofollow=True),
|
|
Link(url='http://example.com/nofollow2.html', text=u'Choose to follow or not', fragment='', nofollow=False),
|
|
Link(url='http://google.com/something', text=u'External link not to follow', nofollow=True)]
|
|
)
|
|
|
|
def test_link_wrong_href(self):
|
|
html = b"""
|
|
<a href="http://example.org/item1.html">Item 1</a>
|
|
<a href="http://[example.org/item2.html">Item 2</a>
|
|
<a href="http://example.org/item3.html">Item 3</a>
|
|
"""
|
|
response = HtmlResponse("http://example.org/index.html", body=html)
|
|
lx = self.extractor_cls()
|
|
self.assertEqual([link for link in lx.extract_links(response)], [
|
|
Link(url='http://example.org/item1.html', text=u'Item 1', nofollow=False),
|
|
Link(url='http://example.org/item3.html', text=u'Item 3', nofollow=False),
|
|
])
|
|
|
|
|
|
class LxmlLinkExtractorTestCase(Base.LinkExtractorTestCase):
|
|
extractor_cls = LxmlLinkExtractor
|
|
|
|
def test_link_wrong_href(self):
|
|
html = b"""
|
|
<a href="http://example.org/item1.html">Item 1</a>
|
|
<a href="http://[example.org/item2.html">Item 2</a>
|
|
<a href="http://example.org/item3.html">Item 3</a>
|
|
"""
|
|
response = HtmlResponse("http://example.org/index.html", body=html)
|
|
lx = self.extractor_cls()
|
|
self.assertEqual([link for link in lx.extract_links(response)], [
|
|
Link(url='http://example.org/item1.html', text=u'Item 1', nofollow=False),
|
|
Link(url='http://example.org/item3.html', text=u'Item 3', nofollow=False),
|
|
])
|
|
|
|
@pytest.mark.xfail
|
|
def test_restrict_xpaths_with_html_entities(self):
|
|
super(LxmlLinkExtractorTestCase, self).test_restrict_xpaths_with_html_entities()
|
|
|