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import warnings
import weakref
from twisted.trial import unittest
from scrapy.http import TextResponse, HtmlResponse, XmlResponse
from scrapy.selector import Selector
from scrapy.selector.lxmlsel import XmlXPathSelector, HtmlXPathSelector, XPathSelector
from lxml import etree
class SelectorTestCase(unittest.TestCase):
def test_simple_selection(self):
"""Simple selector tests"""
body = b"<p><input name='a'value='1'/><input name='b'value='2'/></p>"
response = TextResponse(url="http://example.com", body=body, encoding='utf-8')
sel = Selector(response)
xl = sel.xpath('//input')
self.assertEqual(2, len(xl))
for x in xl:
assert isinstance(x, Selector)
self.assertEqual(sel.xpath('//input').extract(),
[x.extract() for x in sel.xpath('//input')])
self.assertEqual([x.extract() for x in sel.xpath("//input[@name='a']/@name")],
[u'a'])
self.assertEqual([x.extract() for x in sel.xpath("number(concat(//input[@name='a']/@value, //input[@name='b']/@value))")],
[u'12.0'])
self.assertEqual(sel.xpath("concat('xpath', 'rules')").extract(),
[u'xpathrules'])
self.assertEqual([x.extract() for x in sel.xpath("concat(//input[@name='a']/@value, //input[@name='b']/@value)")],
[u'12'])
def test_root_base_url(self):
body = b'<html><form action="/path"><input name="a" /></form></html>'
url = "http://example.com"
response = TextResponse(url=url, body=body, encoding='utf-8')
sel = Selector(response)
self.assertEqual(url, sel.root.base)
def test_deprecated_root_argument(self):
with warnings.catch_warnings(record=True) as w:
root = etree.fromstring(u'<html/>')
sel = Selector(_root=root)
self.assertIs(root, sel.root)
self.assertEqual(str(w[-1].message),
'Argument `_root` is deprecated, use `root` instead')
def test_deprecated_root_argument_ambiguous(self):
with warnings.catch_warnings(record=True) as w:
_root = etree.fromstring(u'<xml/>')
root = etree.fromstring(u'<html/>')
sel = Selector(_root=_root, root=root)
self.assertIs(root, sel.root)
self.assertIn('Ignoring deprecated `_root` argument', str(w[-1].message))
def test_flavor_detection(self):
text = b'<div><img src="a.jpg"><p>Hello</div>'
sel = Selector(XmlResponse('http://example.com', body=text, encoding='utf-8'))
self.assertEqual(sel.type, 'xml')
self.assertEqual(sel.xpath("//div").extract(),
[u'<div><img src="a.jpg"><p>Hello</p></img></div>'])
sel = Selector(HtmlResponse('http://example.com', body=text, encoding='utf-8'))
self.assertEqual(sel.type, 'html')
self.assertEqual(sel.xpath("//div").extract(),
[u'<div><img src="a.jpg"><p>Hello</p></div>'])
def test_http_header_encoding_precedence(self):
# u'\xa3' = pound symbol in unicode
# u'\xc2\xa3' = pound symbol in utf-8
# u'\xa3' = pound symbol in latin-1 (iso-8859-1)
meta = u'<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">'
head = u'<head>' + meta + u'</head>'
body_content = u'<span id="blank">\xa3</span>'
body = u'<body>' + body_content + u'</body>'
html = u'<html>' + head + body + u'</html>'
encoding = 'utf-8'
html_utf8 = html.encode(encoding)
headers = {'Content-Type': ['text/html; charset=utf-8']}
response = HtmlResponse(url="http://example.com", headers=headers, body=html_utf8)
x = Selector(response)
self.assertEqual(x.xpath("//span[@id='blank']/text()").extract(),
[u'\xa3'])
def test_badly_encoded_body(self):
# \xe9 alone isn't valid utf8 sequence
r1 = TextResponse('http://www.example.com', \
body=b'<html><p>an Jos\xe9 de</p><html>', \
encoding='utf-8')
Selector(r1).xpath('//text()').extract()
def test_weakref_slots(self):
"""Check that classes are using slots and are weak-referenceable"""
x = Selector(text='')
weakref.ref(x)
assert not hasattr(x, '__dict__'), "%s does not use __slots__" % \
x.__class__.__name__
def test_deprecated_selector_methods(self):
sel = Selector(TextResponse(url="http://example.com", body=b'<p>some text</p>'))
with warnings.catch_warnings(record=True) as w:
sel.select('//p')
self.assertSubstring('Use .xpath() instead', str(w[-1].message))
with warnings.catch_warnings(record=True) as w:
sel.extract_unquoted()
self.assertSubstring('Use .extract() instead', str(w[-1].message))
def test_deprecated_selectorlist_methods(self):
sel = Selector(TextResponse(url="http://example.com", body=b'<p>some text</p>'))
with warnings.catch_warnings(record=True) as w:
sel.xpath('//p').select('.')
self.assertSubstring('Use .xpath() instead', str(w[-1].message))
with warnings.catch_warnings(record=True) as w:
sel.xpath('//p').extract_unquoted()
self.assertSubstring('Use .extract() instead', str(w[-1].message))
def test_selector_bad_args(self):
with self.assertRaisesRegexp(ValueError, 'received both response and text'):
Selector(TextResponse(url='http://example.com', body=b''), text=u'')
class DeprecatedXpathSelectorTest(unittest.TestCase):
text = '<div><img src="a.jpg"><p>Hello</div>'
def test_warnings_xpathselector(self):
cls = XPathSelector
with warnings.catch_warnings(record=True) as w:
class UserClass(cls):
pass
# subclassing must issue a warning
self.assertEqual(len(w), 1, str(cls))
self.assertIn('scrapy.Selector', str(w[0].message))
# subclass instance doesn't issue a warning
usel = UserClass(text=self.text)
self.assertEqual(len(w), 1)
# class instance must issue a warning
sel = cls(text=self.text)
self.assertEqual(len(w), 2, str((cls, [x.message for x in w])))
self.assertIn('scrapy.Selector', str(w[1].message))
# subclass and instance checks
self.assertTrue(issubclass(cls, Selector))
self.assertTrue(isinstance(sel, Selector))
self.assertTrue(isinstance(usel, Selector))
def test_warnings_xmlxpathselector(self):
cls = XmlXPathSelector
with warnings.catch_warnings(record=True) as w:
class UserClass(cls):
pass
# subclassing must issue a warning
self.assertEqual(len(w), 1, str(cls))
self.assertIn('scrapy.Selector', str(w[0].message))
# subclass instance doesn't issue a warning
usel = UserClass(text=self.text)
self.assertEqual(len(w), 1)
# class instance must issue a warning
sel = cls(text=self.text)
self.assertEqual(len(w), 2, str((cls, [x.message for x in w])))
self.assertIn('scrapy.Selector', str(w[1].message))
# subclass and instance checks
self.assertTrue(issubclass(cls, Selector))
self.assertTrue(issubclass(cls, XPathSelector))
self.assertTrue(isinstance(sel, Selector))
self.assertTrue(isinstance(usel, Selector))
self.assertTrue(isinstance(sel, XPathSelector))
self.assertTrue(isinstance(usel, XPathSelector))
def test_warnings_htmlxpathselector(self):
cls = HtmlXPathSelector
with warnings.catch_warnings(record=True) as w:
class UserClass(cls):
pass
# subclassing must issue a warning
self.assertEqual(len(w), 1, str(cls))
self.assertIn('scrapy.Selector', str(w[0].message))
# subclass instance doesn't issue a warning
usel = UserClass(text=self.text)
self.assertEqual(len(w), 1)
# class instance must issue a warning
sel = cls(text=self.text)
self.assertEqual(len(w), 2, str((cls, [x.message for x in w])))
self.assertIn('scrapy.Selector', str(w[1].message))
# subclass and instance checks
self.assertTrue(issubclass(cls, Selector))
self.assertTrue(issubclass(cls, XPathSelector))
self.assertTrue(isinstance(sel, Selector))
self.assertTrue(isinstance(usel, Selector))
self.assertTrue(isinstance(sel, XPathSelector))
self.assertTrue(isinstance(usel, XPathSelector))
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