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"""
Selectors tests, common for all backends
"""
import re
import weakref
from twisted.trial import unittest
from scrapy.http import TextResponse, HtmlResponse, XmlResponse
from scrapy.selector import XmlXPathSelector, HtmlXPathSelector, \
XPathSelector
from scrapy.utils.test import libxml2debug
class XPathSelectorTestCase(unittest.TestCase):
xs_cls = XPathSelector
hxs_cls = HtmlXPathSelector
xxs_cls = XmlXPathSelector
@libxml2debug
def test_selector_simple(self):
"""Simple selector tests"""
body = "<p><input name='a'value='1'/><input name='b'value='2'/></p>"
response = TextResponse(url="http://example.com", body=body)
xpath = self.hxs_cls(response)
xl = xpath.select('//input')
self.assertEqual(2, len(xl))
for x in xl:
assert isinstance(x, self.hxs_cls)
self.assertEqual(xpath.select('//input').extract(),
[x.extract() for x in xpath.select('//input')])
self.assertEqual([x.extract() for x in xpath.select("//input[@name='a']/@name")],
[u'a'])
self.assertEqual([x.extract() for x in xpath.select("number(concat(//input[@name='a']/@value, //input[@name='b']/@value))")],
[u'12.0'])
self.assertEqual(xpath.select("concat('xpath', 'rules')").extract(),
[u'xpathrules'])
self.assertEqual([x.extract() for x in xpath.select("concat(//input[@name='a']/@value, //input[@name='b']/@value)")],
[u'12'])
def test_selector_unicode_query(self):
body = u"<p><input name='\xa9' value='1'/></p>"
response = TextResponse(url="http://example.com", body=body, encoding='utf8')
xpath = self.hxs_cls(response)
self.assertEqual(xpath.select(u'//input[@name="\xa9"]/@value').extract(), [u'1'])
@libxml2debug
def test_selector_same_type(self):
"""Test XPathSelector returning the same type in x() method"""
text = '<p>test<p>'
assert isinstance(self.xxs_cls(text=text).select("//p")[0],
self.xxs_cls)
assert isinstance(self.hxs_cls(text=text).select("//p")[0],
self.hxs_cls)
@libxml2debug
def test_selector_boolean_result(self):
body = "<p><input name='a'value='1'/><input name='b'value='2'/></p>"
response = TextResponse(url="http://example.com", body=body)
xs = self.hxs_cls(response)
true = xs.select("//input[@name='a']/@name='a'").extract()[0]
false = xs.select("//input[@name='a']/@name='n'").extract()[0]
# the actual result depends on the backend used
assert true in [u'1', u'True'], true
assert false in [u'0', u'False'], false
@libxml2debug
def test_selector_xml_html(self):
"""Test that XML and HTML XPathSelector's behave differently"""
# some text which is parsed differently by XML and HTML flavors
text = '<div><img src="a.jpg"><p>Hello</div>'
self.assertEqual(self.xxs_cls(text=text).select("//div").extract(),
[u'<div><img src="a.jpg"><p>Hello</p></img></div>'])
self.assertEqual(self.hxs_cls(text=text).select("//div").extract(),
[u'<div><img src="a.jpg"><p>Hello</p></div>'])
@libxml2debug
def test_selector_nested(self):
"""Nested selector tests"""
body = """<body>
<div class='one'>
<ul>
<li>one</li><li>two</li>
</ul>
</div>
<div class='two'>
<ul>
<li>four</li><li>five</li><li>six</li>
</ul>
</div>
</body>"""
response = HtmlResponse(url="http://example.com", body=body)
x = self.hxs_cls(response)
divtwo = x.select('//div[@class="two"]')
self.assertEqual(map(unicode.strip, divtwo.select("//li").extract()),
["<li>one</li>", "<li>two</li>", "<li>four</li>", "<li>five</li>", "<li>six</li>"])
self.assertEqual(map(unicode.strip, divtwo.select("./ul/li").extract()),
["<li>four</li>", "<li>five</li>", "<li>six</li>"])
self.assertEqual(map(unicode.strip, divtwo.select(".//li").extract()),
["<li>four</li>", "<li>five</li>", "<li>six</li>"])
self.assertEqual(divtwo.select("./li").extract(),
[])
@libxml2debug
def test_dont_strip(self):
hxs = self.hxs_cls(text='<div>fff: <a href="#">zzz</a></div>')
self.assertEqual(hxs.select("//text()").extract(),
[u'fff: ', u'zzz'])
@libxml2debug
def test_selector_namespaces_simple(self):
body = """
<test xmlns:somens="http://scrapy.org">
<somens:a id="foo">take this</a>
<a id="bar">found</a>
</test>
"""
response = XmlResponse(url="http://example.com", body=body)
x = self.xxs_cls(response)
x.register_namespace("somens", "http://scrapy.org")
self.assertEqual(x.select("//somens:a/text()").extract(),
[u'take this'])
@libxml2debug
def test_selector_namespaces_multiple(self):
body = """<?xml version="1.0" encoding="UTF-8"?>
<BrowseNode xmlns="http://webservices.amazon.com/AWSECommerceService/2005-10-05"
xmlns:b="http://somens.com"
xmlns:p="http://www.scrapy.org/product" >
<b:Operation>hello</b:Operation>
<TestTag b:att="value"><Other>value</Other></TestTag>
<p:SecondTestTag><material>iron</material><price>90</price><p:name>Dried Rose</p:name></p:SecondTestTag>
</BrowseNode>
"""
response = XmlResponse(url="http://example.com", body=body)
x = self.xxs_cls(response)
x.register_namespace("xmlns", "http://webservices.amazon.com/AWSECommerceService/2005-10-05")
x.register_namespace("p", "http://www.scrapy.org/product")
x.register_namespace("b", "http://somens.com")
self.assertEqual(len(x.select("//xmlns:TestTag")), 1)
self.assertEqual(x.select("//b:Operation/text()").extract()[0], 'hello')
self.assertEqual(x.select("//xmlns:TestTag/@b:att").extract()[0], 'value')
self.assertEqual(x.select("//p:SecondTestTag/xmlns:price/text()").extract()[0], '90')
self.assertEqual(x.select("//p:SecondTestTag").select("./xmlns:price/text()")[0].extract(), '90')
self.assertEqual(x.select("//p:SecondTestTag/xmlns:material/text()").extract()[0], 'iron')
@libxml2debug
def test_selector_re(self):
body = """<div>Name: Mary
<ul>
<li>Name: John</li>
<li>Age: 10</li>
<li>Name: Paul</li>
<li>Age: 20</li>
</ul>
Age: 20
</div>
"""
response = HtmlResponse(url="http://example.com", body=body)
x = self.hxs_cls(response)
name_re = re.compile("Name: (\w+)")
self.assertEqual(x.select("//ul/li").re(name_re),
["John", "Paul"])
self.assertEqual(x.select("//ul/li").re("Age: (\d+)"),
["10", "20"])
@libxml2debug
def test_selector_over_text(self):
hxs = self.hxs_cls(text='<root>lala</root>')
self.assertEqual(hxs.extract(),
u'<html><body><root>lala</root></body></html>')
xxs = self.xxs_cls(text='<root>lala</root>')
self.assertEqual(xxs.extract(),
u'<root>lala</root>')
xxs = self.xxs_cls(text='<root>lala</root>')
self.assertEqual(xxs.select('.').extract(),
[u'<root>lala</root>'])
@libxml2debug
def test_selector_invalid_xpath(self):
response = XmlResponse(url="http://example.com", body="<html></html>")
x = self.hxs_cls(response)
xpath = "//test[@foo='bar]"
try:
x.select(xpath)
except ValueError, e:
assert xpath in str(e), "Exception message does not contain invalid xpath"
except Exception:
raise AssertionError("A invalid XPath does not raise ValueError")
else:
raise AssertionError("A invalid XPath does not raise an exception")
@libxml2debug
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 = self.hxs_cls(response)
self.assertEquals(x.select("//span[@id='blank']/text()").extract(),
[u'\xa3'])
@libxml2debug
def test_empty_bodies(self):
r1 = TextResponse('http://www.example.com', body='')
self.hxs_cls(r1) # shouldn't raise error
self.xxs_cls(r1) # shouldn't raise error
@libxml2debug
def test_weakref_slots(self):
"""Check that classes are using slots and are weak-referenceable"""
for cls in [self.xs_cls, self.hxs_cls, self.xxs_cls]:
x = cls()
weakref.ref(x)
assert not hasattr(x, '__dict__'), "%s does not use __slots__" % \
x.__class__.__name__
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