Package lxml :: Package tests :: Module test_classlookup |
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# Source Code for Module lxml.tests.test_classlookup

      1  # -*- coding: utf-8 -*-
      2
      3  """
      4  Tests for different Element class lookup mechanisms.
      5  """
      6
      7
      8  import unittest, doctest, operator
      9
     10  from common_imports import etree, StringIO, HelperTestCase, fileInTestDir
     11  from common_imports import SillyFileLike, canonicalize
     12
     13  xml_str = '''\
     14  <root xmlns="myNS" xmlns:other="otherNS">
     15    <c1 a1="A1" a2="A2" other:a3="A3">
     16      <c2 a1="C2">0</c2>
     17      <c2>1</c2>
     18      <other:c2>2</other:c2>
     19    </c1>
     20  </root>'''
     21
     22 -class ClassLookupTestCase(HelperTestCase):
     23      """Test cases for different Element class lookup mechanisms.
     24      """
     25      etree = etree
     26
     27 -    def tearDown(self):
     28          etree.setElementClassLookup()
     29          super(ClassLookupTestCase, self).tearDown()
     30
     31 -    def test_namespace_lookup(self):
     32          class TestElement(etree.ElementBase):
     33              FIND_ME = "namespace class"
     34
     35          lookup = etree.ElementNamespaceClassLookup()
     36          etree.setElementClassLookup(lookup)
     37
     38          ns = lookup.get_namespace("myNS")
     39          ns[None] = TestElement
     40
     41          root = etree.XML(xml_str)
     42          self.assertEquals(root.FIND_ME,
     43                            TestElement.FIND_ME)
     44          self.assertEquals(root[0].FIND_ME,
     45                            TestElement.FIND_ME)
     46          self.assertFalse(hasattr(root[0][-1], 'FIND_ME'))
     47
     48 -    def test_default_class_lookup(self):
     49          class TestElement(etree.ElementBase):
     50              FIND_ME = "default element"
     51          class TestComment(etree.CommentBase):
     52              FIND_ME = "default comment"
     53          class TestPI(etree.PIBase):
     54              FIND_ME = "default pi"
     55
     56          parser = etree.XMLParser()
     57
     58          lookup = etree.ElementDefaultClassLookup(
     59              element=TestElement, comment=TestComment, pi=TestPI)
     60          parser.setElementClassLookup(lookup)
     61
     62          root = etree.XML("""<?xml version='1.0'?>
     63          <root>
     64            <?myPI?>
     65            <!-- hi -->
     66          </root>
     67          """, parser)
     68
     69          self.assertEquals("default element", root.FIND_ME)
     70          self.assertEquals("default pi", root[0].FIND_ME)
     71          self.assertEquals("default comment", root[1].FIND_ME)
     72
     73 -    def test_attribute_based_lookup(self):
     74          class TestElement(etree.ElementBase):
     75              FIND_ME = "attribute_based"
     76
     77          class_dict = {"A1" : TestElement}
     78
     79          lookup = etree.AttributeBasedElementClassLookup(
     80              "a1", class_dict)
     81          etree.setElementClassLookup(lookup)
     82
     83          root = etree.XML(xml_str)
     84          self.assertFalse(hasattr(root, 'FIND_ME'))
     85          self.assertEquals(root[0].FIND_ME,
     86                            TestElement.FIND_ME)
     87          self.assertFalse(hasattr(root[0][0], 'FIND_ME'))
     88
     89 -    def test_custom_lookup(self):
     90          class TestElement(etree.ElementBase):
     91              FIND_ME = "custom"
     92
     93          class MyLookup(etree.CustomElementClassLookup):
     94              def lookup(self, t, d, ns, name):
     95                  if name == 'c1':
     96                      return TestElement
     97
     98          etree.setElementClassLookup( MyLookup() )
     99
    100          root = etree.XML(xml_str)
    101          self.assertFalse(hasattr(root, 'FIND_ME'))
    102          self.assertEquals(root[0].FIND_ME,
    103                            TestElement.FIND_ME)
    104          self.assertFalse(hasattr(root[0][1], 'FIND_ME'))
    105
    106 -    def test_custom_lookup_ns_fallback(self):
    107          class TestElement1(etree.ElementBase):
    108              FIND_ME = "custom"
    109
    110          class TestElement2(etree.ElementBase):
    111              FIND_ME = "nsclasses"
    112
    113          class MyLookup(etree.CustomElementClassLookup):
    114              def lookup(self, t, d, ns, name):
    115                  if name == 'c1':
    116                      return TestElement1
    117
    118          lookup = etree.ElementNamespaceClassLookup( MyLookup() )
    119          etree.setElementClassLookup(lookup)
    120
    121          ns = lookup.get_namespace("otherNS")
    122          ns[None] = TestElement2
    123
    124          root = etree.XML(xml_str)
    125          self.assertFalse(hasattr(root, 'FIND_ME'))
    126          self.assertEquals(root[0].FIND_ME,
    127                            TestElement1.FIND_ME)
    128          self.assertFalse(hasattr(root[0][1], 'FIND_ME'))
    129          self.assertEquals(root[0][-1].FIND_ME,
    130                            TestElement2.FIND_ME)
    131
    132 -    def test_parser_based_lookup(self):
    133          class TestElement(etree.ElementBase):
    134              FIND_ME = "parser_based"
    135
    136          lookup = etree.ParserBasedElementClassLookup()
    137          etree.setElementClassLookup(lookup)
    138
    139          class MyLookup(etree.CustomElementClassLookup):
    140              def lookup(self, t, d, ns, name):
    141                  return TestElement
    142
    143          parser = etree.XMLParser()
    144          parser.setElementClassLookup( MyLookup() )
    145
    146          root = etree.parse(StringIO(xml_str), parser).getroot()
    147          self.assertEquals(root.FIND_ME,
    148                            TestElement.FIND_ME)
    149          self.assertEquals(root[0].FIND_ME,
    150                            TestElement.FIND_ME)
    151
    152          root = etree.parse(StringIO(xml_str)).getroot()
    153          self.assertFalse(hasattr(root, 'FIND_ME'))
    154          self.assertFalse(hasattr(root[0], 'FIND_ME'))
    155
    156
    157 -def test_suite():
    158      suite = unittest.TestSuite()
    159      suite.addTests([unittest.makeSuite(ClassLookupTestCase)])
    160      return suite
    161
    162  if __name__ == '__main__':
    163      print 'to test use test.py %s' % __file__
    164