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

      1  # -*- coding: utf-8 -*-
      2
      3  """
      4  Tests specific to the Python based class lookup.
      5  """
      6
      7
      8  import unittest, operator, os.path, sys
      9
     10  this_dir = os.path.dirname(__file__)
     11  if this_dir not in sys.path:
     12      sys.path.insert(0, this_dir) # needed for Py3
     13
     14  from common_imports import etree, StringIO, HelperTestCase, fileInTestDir
     15  from common_imports import SillyFileLike, canonicalize, doctest, _bytes
     16
     17  from lxml.etree import PythonElementClassLookup
     18
     19  xml_str = _bytes('''\
     20  <obj:root xmlns:obj="objectified" xmlns:other="otherNS">
     21    <obj:c1 a1="A1" a2="A2" other:a3="A3">
     22      <obj:c2>0</obj:c2>
     23      <obj:c2>1</obj:c2>
     24      <obj:c2>2</obj:c2>
     25      <other:c2>3</other:c2>
     26      <c2>3</c2>
     27    </obj:c1>
     28  </obj:root>''')
     29
     30
     31 -class PyClassLookupTestCase(HelperTestCase):
     32      """Test cases for the lxml.pyclasslookup class lookup mechanism.
     33      """
     34      etree = etree
     35      parser = etree.XMLParser()
     36      Element = parser.makeelement
     37
     38 -    def tearDown(self):
     39          self.parser.set_element_class_lookup(None)
     40          super(PyClassLookupTestCase, self).tearDown()
     41
     42 -    def _setClassLookup(self, lookup_function):
     43          class Lookup(PythonElementClassLookup):
     44              def lookup(self, *args):
     45                  return lookup_function(*args)
     46          self.parser.set_element_class_lookup( Lookup() )
     47
     48 -    def _buildElementClass(self):
     49          class LocalElement(etree.ElementBase):
     50              pass
     51          return LocalElement
     52
     53 -    def XML(self, xml):
     54          return self.etree.XML(xml, self.parser)
     55
     56      # --- Test cases
     57
     58 -    def test_lookup(self):
     59          el_class = self._buildElementClass()
     60          el_class.i = 1
     61          def lookup(*args):
     62              if el_class.i == 1:
     63                  el_class.i = 2
     64              return el_class
     65          self._setClassLookup(lookup)
     66          root = self.XML(xml_str)
     67          self.assertEqual(2, el_class.i)
     68
     69 -    def test_lookup_keep_ref_assertion(self):
     70          el_class = self._buildElementClass()
     71          el_class.EL = None
     72          def lookup(doc, el):
     73              if el_class.EL is None:
     74                  el_class.EL = el
     75              return el_class
     76          self._setClassLookup(lookup)
     77          root = self.XML(xml_str)
     78          self.assertNotEqual(None, el_class.EL)
     79          self.assertRaises(ReferenceError, el_class.EL.getchildren)
     80
     81 -    def test_lookup_tag(self):
     82          el_class = self._buildElementClass()
     83          el_class.TAG = None
     84          def lookup(doc, el):
     85              if el_class.TAG is None:
     86                  el_class.TAG = el.tag
     87              return el_class
     88          self._setClassLookup(lookup)
     89          root = self.XML(xml_str)
     90          self.assertNotEqual(None, root.TAG)
     91          self.assertEqual(root.tag, root.TAG)
     92
     93 -    def test_lookup_text(self):
     94          el_class = self._buildElementClass()
     95          el_class.TEXT = None
     96          def lookup(doc, el):
     97              if el_class.TEXT is None:
     98                  el_class.TEXT = el.text
     99              return el_class
    100          self._setClassLookup(lookup)
    101          root = self.XML(xml_str)
    102          self.assertNotEqual(None, root.TEXT)
    103          self.assertEqual(root.text, root.TEXT)
    104
    105 -    def test_lookup_tail(self):
    106          el_class = self._buildElementClass()
    107          el_class.TAIL = None
    108          def lookup(doc, el):
    109              if el_class.TAIL is None:
    110                  el_class.TAIL = el.tail
    111              return el_class
    112          self._setClassLookup(lookup)
    113          root = self.XML(xml_str)
    114          self.assertEqual(root.tail, root.TAIL)
    115
    116 -    def test_lookup_attrib(self):
    117          el_class = self._buildElementClass()
    118          el_class.ATTRIB = None
    119          def lookup(doc, el):
    120              if el_class.ATTRIB is None:
    121                  el_class.ATTRIB = el[0].attrib
    122              return el_class
    123          self._setClassLookup(lookup)
    124          root = self.XML(xml_str)
    125          items1 = list(root[0].attrib.items())
    126          items1.sort()
    127          items2 = list(root.ATTRIB.items())
    128          items2.sort()
    129          self.assertEqual(items1, items2)
    130
    131 -    def test_lookup_prefix(self):
    132          el_class = self._buildElementClass()
    133          el_class.PREFIX = None
    134          def lookup(doc, el):
    135              if el_class.PREFIX is None:
    136                  el_class.PREFIX = el.prefix
    137              return el_class
    138          self._setClassLookup(lookup)
    139          root = self.XML(xml_str)
    140          self.assertEqual(root.prefix, root.PREFIX)
    141
    142 -    def test_lookup_sourceline(self):
    143          el_class = self._buildElementClass()
    144          el_class.LINE = None
    145          def lookup(doc, el):
    146              if el_class.LINE is None:
    147                  el_class.LINE = el.sourceline
    148              return el_class
    149          self._setClassLookup(lookup)
    150          root = self.XML(xml_str)
    151          self.assertEqual(root.sourceline, root.LINE)
    152
    153 -    def test_lookup_getitem(self):
    154          el_class = self._buildElementClass()
    155          el_class.CHILD_TAG = None
    156          def lookup(doc, el):
    157              el_class.CHILD_TAG = el[0].tag
    158              return el_class
    159          self._setClassLookup(lookup)
    160          root = self.XML(xml_str)
    161          child_tag = root.CHILD_TAG
    162          self.assertNotEqual(None, child_tag)
    163          self.assertEqual(root[0].tag, child_tag)
    164
    165 -    def test_lookup_getitem_neg(self):
    166          el_class = self._buildElementClass()
    167          el_class.CHILD_TAG = None
    168          def lookup(doc, el):
    169              if el_class.CHILD_TAG is None:
    170                  el_class.CHILD_TAG = el[-1].tag
    171              return el_class
    172          self._setClassLookup(lookup)
    173          root = self.XML(xml_str)
    174          child_tag = root.CHILD_TAG
    175          self.assertNotEqual(None, child_tag)
    176          self.assertEqual(root[-1].tag, child_tag)
    177
    178 -    def test_lookup_getslice(self):
    179          el_class = self._buildElementClass()
    180          el_class.CHILD_TAGS = None
    181          def lookup(doc, el):
    182              if el_class.CHILD_TAGS is None:
    183                  el_class.CHILD_TAGS = [ c.tag for c in el[1:-1] ]
    184              return el_class
    185          self._setClassLookup(lookup)
    186          root = self.XML(xml_str)
    187          child_tags = root.CHILD_TAGS
    188          self.assertNotEqual(None, child_tags)
    189          self.assertEqual([ c.tag for c in root[1:-1] ],
    190                            child_tags)
    191
    192 -    def test_lookup_len(self):
    193          el_class = self._buildElementClass()
    194          el_class.LEN = None
    195          def lookup(doc, el):
    196              if el_class.LEN is None:
    197                  el_class.LEN = len(el)
    198              return el_class
    199          self._setClassLookup(lookup)
    200          root = self.XML(xml_str)
    201          self.assertEqual(1, el_class.LEN)
    202
    203 -    def test_lookup_bool(self):
    204          el_class = self._buildElementClass()
    205          el_class.TRUE = None
    206          def lookup(doc, el):
    207              if el_class.TRUE is None:
    208                  el_class.TRUE = bool(el)
    209              return el_class
    210          self._setClassLookup(lookup)
    211          root = self.XML(xml_str)
    212          self.assertTrue(el_class.TRUE)
    213
    214 -    def test_lookup_get(self):
    215          el_class = self._buildElementClass()
    216          el_class.VAL = None
    217          def lookup(doc, el):
    218              if el_class.VAL is None:
    219                  el_class.VAL = el[0].get('a1')
    220              return el_class
    221          self._setClassLookup(lookup)
    222          root = self.XML(xml_str)
    223          self.assertNotEqual(None, el_class.VAL)
    224          self.assertEqual(root[0].get('a1'), el_class.VAL)
    225
    226 -    def test_lookup_get_default(self):
    227          el_class = self._buildElementClass()
    228          default = str(id(el_class))
    229          el_class.VAL = None
    230          def lookup(doc, el):
    231              if el_class.VAL is None:
    232                  el_class.VAL = el[0].get('unknownattribute', default)
    233              return el_class
    234          self._setClassLookup(lookup)
    235          root = self.XML(xml_str)
    236          self.assertEqual(default, el_class.VAL)
    237
    238 -    def test_lookup_getchildren(self):
    239          el_class = self._buildElementClass()
    240          el_class.CHILD_TAGS = None
    241          def lookup(doc, el):
    242              if el_class.CHILD_TAGS is None:
    243                  el_class.CHILD_TAGS = [ c.tag for c in el.getchildren() ]
    244              return el_class
    245          self._setClassLookup(lookup)
    246          root = self.XML(xml_str)
    247          child_tags = root.CHILD_TAGS
    248          self.assertNotEqual(None, child_tags)
    249          self.assertEqual([ c.tag for c in root.getchildren() ],
    250                            child_tags)
    251
    252 -    def test_lookup_iter_children(self):
    253          el_class = self._buildElementClass()
    254          el_class.CHILD_TAGS = None
    255          def lookup(doc, el):
    256              if el_class.CHILD_TAGS is None:
    257                  el_class.CHILD_TAGS = [ c.tag for c in el ]
    258              return el_class
    259          self._setClassLookup(lookup)
    260          root = self.XML(xml_str)
    261          child_tags = root.CHILD_TAGS
    262          self.assertNotEqual(None, child_tags)
    263          self.assertEqual([ c.tag for c in root.getchildren() ],
    264                            child_tags)
    265
    266 -    def test_lookup_iterchildren(self):
    267          el_class = self._buildElementClass()
    268          el_class.CHILD_TAGS = None
    269          def lookup(doc, el):
    270              if el_class.CHILD_TAGS is None:
    271                  el_class.CHILD_TAGS = [ c.tag for c in el.iterchildren() ]
    272              return el_class
    273          self._setClassLookup(lookup)
    274          root = self.XML(xml_str)
    275          child_tags = root.CHILD_TAGS
    276          self.assertNotEqual(None, child_tags)
    277          self.assertEqual([ c.tag for c in root.getchildren() ],
    278                            child_tags)
    279
    280 -    def test_lookup_iterchildren_tag(self):
    281          el_class = self._buildElementClass()
    282          el_class.CHILD_TAGS = None
    283          def lookup(doc, el):
    284              if not el_class.CHILD_TAGS:
    285                  el_class.CHILD_TAGS = [
    286                      c.tag for c in el.iterchildren(tag='{objectified}c2') ]
    287              return el_class
    288          self._setClassLookup(lookup)
    289
    290          root = self.XML(xml_str)
    291          child_tags = root.CHILD_TAGS
    292          self.assertNotEqual(None, child_tags)
    293          self.assertEqual([], child_tags)
    294
    295          c1 = root[0]
    296          child_tags = root.CHILD_TAGS
    297          self.assertNotEqual(None, child_tags)
    298          self.assertNotEqual([], child_tags)
    299          self.assertEqual(
    300              [ c.tag for c in root[0].iterchildren(tag='{objectified}c2') ],
    301              child_tags)
    302
    303 -    def test_lookup_getparent(self):
    304          el_class = self._buildElementClass()
    305          el_class.PARENT = None
    306          def lookup(doc, el):
    307              if el_class.PARENT is None:
    308                  el_class.PARENT = el[0].getparent().tag
    309              return el_class
    310          self._setClassLookup(lookup)
    311          root = self.XML(xml_str)
    312          self.assertEqual(root.tag, root.PARENT)
    313
    314 -    def test_lookup_getnext(self):
    315          el_class = self._buildElementClass()
    316          el_class.NEXT = None
    317          def lookup(doc, el):
    318              if el_class.NEXT is None:
    319                  el_class.NEXT = el[0][1].getnext().tag
    320              return el_class
    321          self._setClassLookup(lookup)
    322          root = self.XML(xml_str)
    323          self.assertNotEqual(None, el_class.NEXT)
    324          self.assertEqual(root[0][1].getnext().tag, el_class.NEXT)
    325
    326 -    def test_lookup_getprevious(self):
    327          el_class = self._buildElementClass()
    328          el_class.PREV = None
    329          def lookup(doc, el):
    330              if el_class.PREV is None:
    331                  el_class.PREV = el[0][1].getprevious().tag
    332              return el_class
    333          self._setClassLookup(lookup)
    334          root = self.XML(xml_str)
    335          self.assertNotEqual(None, el_class.PREV)
    336          self.assertEqual(root[0][1].getprevious().tag, el_class.PREV)
    337
    338 -    def test_comments_fallback(self):
    339          def return_none(*args):
    340              return None
    341
    342          self._setClassLookup(return_none)
    343          el = self.XML('<a><!-- hello world --></a>')
    344          self.assertEqual(el[0].tag, self.etree.Comment)
    345          self.assertEqual(el[0].text, " hello world ")
    346
    347
    348 -def test_suite():
    349      suite = unittest.TestSuite()
    350      suite.addTests([unittest.makeSuite(PyClassLookupTestCase)])
    351      return suite
    352
    353  if __name__ == '__main__':
    354      print('to test use test.py %s' % __file__)
    355