lxml.tests.test_xpathevaluator

xpath()

Test xpath extension functions.

>>> root = SAMPLE_XML
>>> e = etree.XPathEvaluator(root, None, [extension])
>>> e.evaluate("stringTest('you')")
'Hello you'
>>> e.evaluate(u"stringTest('élan')")
u'Hello \xe9lan'
>>> e.evaluate("stringTest('you','there')")
Traceback (most recent call last):
...
TypeError: stringTest() takes exactly 2 arguments (3 given)
>>> e.evaluate("floatTest(2)")
6.0
>>> e.evaluate("booleanTest(true())")
False
>>> map(tag, e.evaluate("setTest(/body/tag)"))
['tag']
>>> map(tag, e.evaluate("setTest2(/body/*)"))
['tag', 'section']
>>> e.evaluate("argsTest1('a',1.5,true(),/body/tag)")
"a, 1.5, True, ['tag', 'tag', 'tag']"
>>> map(tag, e.evaluate("argsTest2(/body/tag, /body/section)"))
['tag', 'section', 'tag', 'tag']
>>> e.evaluate("resultTypesTest()")
Traceback (most recent call last):
...
XPathResultError: This is not a node: x
>>> try:
...     e.evaluate("resultTypesTest2()")
... except etree.XPathResultError:
...     print "Got error"
Got error

SAMPLE_XML

Value:

etree.parse(StringIO("""
<body>
  <tag>text</tag>
  <section>
    <tag>subtext</tag>
  </section>
  <tag />
  <tag />
...

extension

Value:

{(None, 'stringTest'): stringTest, (None, 'floatTest'): floatTest, (No
ne, 'booleanTest'): booleanTest, (None, 'setTest'): setTest, (None, 's
etTest2'): setTest2, (None, 'argsTest1'): argsTest1, (None, 'argsTest2
'): argsTest2, (None, 'resultTypesTest'): resultTypesTest, (None, 'res
ultTypesTest2'): resultTypesTest2,}

Module test_xpathevaluator

xpath()

SAMPLE_XML

extension