def test_predicate_assignment_operator(self):
"Test a predicate cannot contain an assignment operator."
self.assertPredicateRaises(Axis('child'),
[Predicate('./section = "Q"')], SyntaxError)
self.assertPredicateRaises(Axis('child'),
[Predicate('@attribute = "Q"')],
SyntaxError)
def test_predicate_associates_with_last_step(self):
"Test a predicate that finds the first child section of all nodes."
path = Docpath([
DocpathStep(Axis('root'), 'node'),
DocpathStep(Axis('descendant_or_self'), 'node'),
DocpathStep(Axis('child'), 'section'),
Predicate('1')
])
self.assertEqual(
[' '.join(n['names']) for n, _ in path.traverse(self.node)],
['c', 'f', 'g', 'j', 'l', 'q', 'u'])
def test_predicate_not_element(self):
"Test a predicate that find nodes that do not match."
path = Docpath([
DocpathStep(Axis('descendant_or_self'), 'node'),
Predicate('name() != "section"')
])
self.assertEqual(
[n[0].__class__.__name__ for n in path.traverse(self.node)], [
'title', 'Text', 'title', 'Text', 'title', 'Text', 'title',
'Text', 'title', 'Text', 'title', 'Text', 'title', 'Text',
'title', 'Text', 'title', 'Text', 'title', 'Text'
])
def test_predicate_forward_axis(self):
"Test a predicate that uses a forward axis."
self.assertPredicate(Axis('following_sibling'), [Predicate('1')],
['s'])
def test_predicate_count_nodeset(self):
"Test a predicate that counts the amount of nodes in a path."
self.assertPredicate(Axis('child'),
[Predicate('count(^//section) == 21')],
['j', 'k', 'n', 'o', 'p'])
def test_predicate_node_value(self):
"Test a predicate that tests a node's value."
self.assertPredicate(Axis('child'), [Predicate('./section == "Q"')],
['p'])
def test_predicate_node_exists(self):
"Test a predicate that tests whether a node exists."
self.assertPredicate(Axis('child'), [Predicate('./section')],
['k', 'p'])
def test_predicate_attribute_value(self):
"Test a predicate that tests an attribute's value."
self.assertPredicate(Axis('child'), [Predicate('@names == "n"')],
['n'])
def test_predicate_attribute_exists(self):
"Test a predicate that tests whether an attribute exists."
self.assertPredicate(Axis('child'), [Predicate('@names')],
['j', 'k', 'n', 'o', 'p'])
def test_predicate_number(self):
"Test a predicate that only contains a number."
self.assertPredicate(Axis('child'), [Predicate('1')], ['j'])
def test_predicate_relational(self):
"Test a predicate that contains a relational expression."
self.assertPredicate(Axis('child'), [Predicate('position() > 2')],
['n', 'o', 'p'])
def test_predicate_equality(self):
"Test a predicate that contains an equality expression."
self.assertPredicate(Axis('child'), [Predicate('position() == 2')],
['k'])
def test_predicate_false(self):
"Test a predicate that is always false."
self.assertPredicate(Axis('child'), [Predicate('False')], [])
def test_predicate_true(self):
"Test a predicate that is always true."
self.assertPredicate(Axis('child'), [Predicate('True')],
['j', 'k', 'n', 'o', 'p'])
def test_predicate_reverse_axis(self):
"Test a predicate that uses a reverse axis."
self.assertPredicate(Axis('preceding_sibling'), [Predicate('1')],
['h'])
def test_predicate_number_expression(self):
"Test a predicate that evaluates to a number."
self.assertPredicate(Axis('child'), [Predicate('last()')], ['p'])
def test_predicate_double_number(self):
"Test multiple predicates that select nodes by number."
self.assertPredicate(Axis('child'),
[Predicate('4'), Predicate('1')], ['o'])
def test_predicate_double_number_all_filtered_out(self):
"Test multiple predicates that select no nodes."
self.assertPredicate(Axis('child'),
[Predicate('1'), Predicate('4')], [])